Matters needing attention when using portable electric cutting blades

flat cutting disc on sale

 flat cutting disc on sale

1. Select the cutting piece whose structural characteristics are in accordance with the material to be ground and the grinding property. Before use, perform a comprehensive performance check and then install it by a special person.
2. Adjustable cutting blade protective cover should be used to adjust according to work requirements at any time; the maximum exposed angle of the circumference and side should not exceed 180o; the grinding speed should not be higher than the rated speed of the 125*1*22 EN12413 cutting disc during use.
3. When grinding or cutting, the force should not be too large, and the force should be applied evenly to prevent the cutting piece from being broken; the operator should wear a protective mirror.
4. When handling the cutting piece, care should be taken not to bump or bump into hard metal or other objects. The cutting piece should be away from grease, water or other solvents.

Selection of the hardness of the cutting piece Hardness of the cutting piece is an important indicator to measure the “self-sharpness” of the cutting piece. During the grinding process, the abrasive grains gradually become sharp and blunt, and some of the passivated abrasive grains continue to work, and the pressure acting on the abrasive grains will continuously increase; when the pressure is large to a certain value, some abrasive grains will Self-crushing to form a new cutting edge; when the pressure exceeds the bonding force of the bonding agent, the abrasive particles will fall off by themselves. The property of the passivated abrasive particles to self-crush or fall off to keep the cutting piece sharp is called “self-sharpness”.

The hardness of the dicing sheet reflects the ease with which the abrasive particles fall off the surface of the dicing sheet under the action of the grinding force. If the cutting piece is hard, it means that the abrasive grain is hard to fall off; the cutting piece is soft, indicating that the abrasive grain is easy to fall off.

The hardness of the cutting piece and the hardness of the abrasive grain are two different concepts that must be clearly distinguished.
It is not that the hardness of the diamond cutting piece must be high. The abrasive of the ordinary abrasive grain brown fused alumina must be low.

Cutting piece hardness grade. Expressed in English letters: A B C D E F G H I J K L M N P Q…….
Soft and hard order is incremented by times. Common hardness is K-P.

The cutting piece is selected too hard, the blunt abrasive grains are not easy to fall off, the flat cutting disc on sale is easy to block, the grinding heat is increased, the workpiece is easy to burn, the grinding efficiency is low, and the surface quality of the workpiece is affected;
The cutting piece is selected to be too soft, and the abrasive grain is also peeled off when it is sharp, which increases the loss of the cutting piece, easily loses the correct geometric shape, and affects the accuracy of the workpiece.
Therefore, the selection of the hardness of the cutting piece should be appropriate. It should also be considered according to the contact area of the cutting piece and the workpiece, the shape of the workpiece, the way of grinding, the cooling method, the type of bonding agent of the cutting piece, etc.

125*1*22 EN12413 cutting disc 

125*1*22 EN12413 cutting disc

 

Metal cutting machine operation and maintenance

 cutting disc for stainless steel

When clamping the cutting piece, it is necessary to select a suitable and safe clamping method according to the material type. The low price disc for metal must be horizontally perpendicular to the cutting line of the tool, and must be fastened and secured. The long material must be fastened with a special bracket.

When starting the cutting, it is necessary to observe whether the incision is skewed, and it is necessary to stop immediately when the deflection is found to prevent the cutter or the cutting piece from being twisted and broken.

When working, the operator must stand on the side of the cutting direction of the cutter and the aluminum abrasive cutting disc to prevent the cutter, the cutting piece and the chip from colliding and injuring people, and must be away from the rotating part and the stroke range of the ram.
The cutting blade cutting knife must be slowly and evenly speeded, and the force should be evenly applied. It is strictly forbidden to cut soft materials on the cutting blade cutting machine.

When clamping large cutting blades, the crane should be operated correctly, the cutting piece should be hung firmly, the command should be clear, and the obstacles should be checked carefully on the worktable. The bottom of the cutting piece should not be supported by hand. Slow speed is used when falling, and it is not allowed to produce on the machine tool. Shock. Only after correct positioning and reliable fastening can the processing be carried out. After processing, it must be determined that there is no lifting obstacle before the cutting piece can be hung.

When loading and unloading the cutting piece, it is necessary to stop and then load and unload the cutting disc for stainless steel.

It is strictly forbidden to clean the chips by hand during processing, and special tools must be used. When there is too much accumulation of chips, it should be stopped and cleaned up in time.

The cooling fluid flow rate of the cutting fluid should be adjusted properly, and the cooling part should be reasonable, and splashing is not allowed during processing. The metamorphic cutting fluid should be cleaned and collected in time, and sent to the unit to collect the spot. It is strictly forbidden to dump.

When the machine tool malfunctions or has abnormal noise, it should be stopped and inspected and processed in time. When it is unable to process, report it to the maintenance personnel in time, and fill in the daily maintenance records of the equipment and record when the platform is stopped. All electrical faults are strictly prohibited from handling by the operator.

At the end of processing or after work, the equipment should be cleaned according to the maintenance requirements of the equipment at the end of the shift, and the equipment should be thoroughly wiped.

Maintenance content: Thoroughly clean the dirt; wipe the device thoroughly.

 

low price disc for metal

Do not know how to make high precision and low roughness?

 flat cutting disc on sale

Grinding principle
The research content of the grinding principle mainly includes the grinding debris formation process, grinding force and grinding power, grinding heat and grinding temperature, grinding precision and surface quality, grinding efficiency, etc., in order to understand the essence of grinding, And to improve or create grinding methods.

During the formation of the grinding debris, the spacing and height of the abrasive grains arranged on the grinding tool are randomly distributed. The abrasive particles are a polyhedron, and each of the corners can be regarded as a flat cutting disc on sale with a tip angle of approximately 90° to 120°. The tip is an arc of a radius of a few microns to a few tens of microns. Finely ground abrasives have tiny cutting edges on the surface of the abrasive particles called microedges. The abrasive grains have a large negative rake angle during grinding, and the average value is about -60°. The cutting process of the abrasive particles can be divided into three stages. Slip phase: The abrasive particles begin to squeeze into the workpiece, and the surface of the workpiece is elastically deformed without chips. Plough stage: the abrasive squeezing depth is increased, the workpiece is plastically deformed, the plough is grooved, the granules are bulged on both sides and the front end; the cutting stage: the plunging depth continues to increase, and the temperature reaches or exceeds the criticality of the workpiece material. At the temperature, part of the workpiece material slips significantly along the shear plane to form wear debris. Depending on the conditions, the three stages of the abrasive cutting process may exist in part or in part. The shape of the grinding chips is banded, squashed and fused. It can be used to analyze the influence of various main process parameters, 14 inches cutting disc characteristics, cooling lubrication conditions and abrasive properties on the grinding process. Measures for surface quality and grinding efficiency.

 14 inches cutting disc

 

The main quality problem of the cutting piece and its harm

fiber cutting disc Chinese supplier

 

When the fiber-reinforced resin sheet cutting blade and the shaped flat cutting disc on sale are used, most of them are hand-held cutting and grinding, and the distance between the operator and the cutting piece is relatively close. Therefore, once the rotating strength is poor, the cutting piece is broken during the cutting or grinding process, which is easy to cause. Personal injury or death.

Unsatisfactory hardness
The hardness of the cutting piece refers to the resistance of the bonding agent to resist the detachment of the abrasive particles from the surface of the cutting piece under the action of an external force or the ease with which the abrasive particles are detached from the surface of the cutting piece. Hardness can accurately reflect the grinding performance of the cutting piece, which is one of the important indicators to measure the quality of the fiber cutting disc Chinese supplier. There are two requirements for the hardness of the cutting piece:
Uniformity of hardness (the difference between the maximum and minimum values of the hardness values of each point measured) shall comply with the standards;
The compliance requirement of the hardness, that is, the average value of the hardness (the arithmetic mean of the measured values of the hardness of each measuring point) is within the allowable range specified by the standard. The proportion of unqualified hardness is also quite high. For example, the hardness of the flat cutting piece is unqualified, and it exceeds 20% of the total number of unqualified parts.

 

flat cutting disc on sale

These reasons lead to low profit margins for cutting companies?

 

fiber cutting disc Chinese supplier

The market is weak, the competition between the peers is fierce, and the cutting-slice industry enterprises are faced with the dilemma of low profits. The comprehensive analysis is nothing more than the following reasons:
1. There is no sound market mechanism
As is known to all, the flat cutting disc on sale industry is difficult to form a relevant management mechanism due to the low barriers to entry. Although many associations and institutions in the industry have called for fair and reasonable competition, they have little effect.
The traditional distribution center of cutting chip products is a systematic marketing strategy, and the lack of relevant regional protection, the stable price system is even more difficult to talk about. Once the professional market is formed, and with the strong supervision of the market, the production enterprises can be guaranteed to be worthy of the name, forming a consumer’s purchase centripetal force, avoiding the phenomenon that the peers flock to, blindly produce, cause inventory, and lower prices.
2, no comprehensive brand ability
The cutting piece products that are generally circulated in the market are simple in style, outdated, and have a rough workmanship, even without brand protection, so that consumers’ trust cannot be obtained.
According to relevant market research, 45.3% of hardware consumers use the brand as the primary demand for purchasing products when purchasing cutting products, which implies that it is even more difficult for unnamed brands to gain a foothold in the market. In this era of information redundancy, the brand is obviously a target, which can concentrate the people with fixed characteristics under their unified management, which is more conducive to the promotion of enterprises.
3. Foreign companies seize the market
A large number of hardware products in China are produced in small workshops, especially in the fiber cutting disc Chinese supplier industry. Because of their lack of professionalism and exquisiteness, many foreign-funded enterprises have opportunities to take advantage of.
On the contrary, foreign cutting companies are mostly “small but specialized, small and fine”; foreign famous brand cutting products make domestic enterprises far behind, so domestic cutting products are difficult to enter the high-end market, and only some services are not very demanding. Business.
4, the cost of rising public
From the industry operation report of the previous two years, the main reason for the decline in profit growth in the industry is the increase in costs. The increase in administrative expenses and the increase in financial expenses were relatively large. Electricity, workers’ wages, and purchase of raw materials all increased in varying degrees. Many enterprises returned funds, processed inventories, and sold products at low prices. In addition, due to environmental protection or market reasons, enterprises have to increase the cost of transformation and upgrading, and the current transformation and upgrading is not a simple furnace, the site is increased, but the quality changes, intelligent, automated and widely used, advanced The use of technology and technology has increased investment in fixed assets, increased costs, and diluted profits.
Nowadays, the quality of our products is constantly improving. Many products have been able to reach foreign standards. The continuous decline in prices is caused by mutual price reduction. It is hoped that enterprises can communicate with each other and learn from each other to achieve the goal of common improvement. In the process of learning, we must digest advanced experience, we must not make hard imitation, and we must respect the intellectual property rights of R&D enterprises. This is also the basis for in-depth exchanges.

flat cutting disc on sale

The difference between resin bond cutting sheet and diamond cutting sheet

  

14 inches cutting disc

Resin bond cutting sheets and diamond cutting sheets are all kinds of cutting sheets. What is the difference between the two?
Resin cutting piece is a cutting piece made of resin, such as phenolic, epoxy, polyurethane, etc., polyvinyl alcohol, resin cutting piece is high in strength, can add reinforcing fiber mesh and steel bar in aluminum abrasive cutting disc, such as cutting piece, grinding At present, most of the resin cutting sheets are not waterproof and can not be ground with grinding fluid. Of course, there are some resin cutting sheets that need to be added with grinding liquid grinding, such as epoxy. The grinding of resin cutting sheets is smooth and not easy. burn.
The resin cut sheets are generally classified into ordinary resin cut sheets and super hard resin cut sheets according to abrasives. The ordinary resin cutting sheet is a cutting piece mainly composed of white abrasive, brown fused alumina, silicon carbide and the like, and the super-hard resin cutting sheet is a 5 inch resin cutting disc for metal mainly composed of diamond or CBN.
Resin cutting discs for grinding high speed steel, tool and die steel and superalloys above FtRC50, super heat resistant stainless steel, cermets, ceramics, glassware, limonite, high speed steel, alloy tools and many others The ideal grinding tool for superhard materials.
Diamond cutting piece, which is made of diamond abrasive as raw material, and is made of metal powder, resin powder, ceramic and electroplated metal as bonding agent, and is made of round-shaped fixed abrasive with central through hole. It is also grinding cemented carbide and glass. Special tools for high-hard and brittle materials such as ceramics and precious stones.

The resin cutting piece is a cutting piece made of resin, which is widely used in the industries of cutting piece, double end face, heavy load cutting piece, polishing wheel, etc. The selection of the 14 inches cutting disc is seriously affecting the grinding effect and the grinding cost. Key factor. At the same time, different resin-cut sheets have different applications depending on the shape and size, and the abrasives and binders are different.
There are different types of refiners for resin-cut sheets, among which white fused alumina, black silicon carbide, and brown fused alumina are widely used.
1 White corundum (WA): The hardness is slightly higher than that of brown corundum. The toughness is lower than that of brown corundum. When grinding, the abrasive grains are easily broken, so the grinding produces small heat, which is mainly suitable for grinding hardened steel, stainless steel and high carbon. Metal materials such as steel and high speed steel.
2. Black silicon carbide (C): It is brittle and sharp, and its hardness is higher than that of white corundum. It is mainly suitable for grinding metal materials with low mechanical strength, such as cast iron, yellow copper and aluminum.
3 Brown corundum (A): high hardness and high toughness, mainly suitable for grinding metals with high tensile strength, such as cast iron, carbon steel, alloy steel, hard bronze and other metal materials.

5 inch resin cutting disc for metal

The importance of cutting piece selection in grinding

 aluminum abrasive cutting disc

Grinding is generally used as the final step in the machining of workpieces. The task is to ensure that the parts of the product meet the precision and surface quality required on the drawings. Grinding surface roughness is closely related to part accuracy, and certain precision should have corresponding surface roughness. Under normal circumstances, the size should be effectively controlled, the roughness Ra should not exceed one-eighth of the dimensional tolerance. The effect of grinding surface roughness on the performance of the part is: the smaller the surface roughness value, the part The better the wear resistance, corrosion resistance and fatigue resistance. The opposite is true.

Therefore, in the grinding process, care must be taken to reduce the surface roughness. The main process factors affecting the surface roughness of the grinding process have a significant influence on the particle size of the cutting piece. The finer the particle size of the aluminum abrasive cutting disc, the more abrasive grains involved in the grinding, the lower the surface roughness of the grinding. Generally, the cutting piece of grain size of 46-80 is used for grinding, and the cutting piece of grain size of 150-240 is used for fine grinding. The resin graphite 5 inch resin cutting disc for metal of W10~W7 grain size should be selected for mirror grinding, and a good workpiece can be obtained. Surface roughness.

In recent years, with the development and application of new technologies, the development of high-precision grinding technology has made the grinding size 0.1-0.3μm, the surface roughness is 0.2-0.05μm, the grinding surface metamorphic layer and residual stress are very small, obviously Improved processing quality.

Form grinding, especially high-precision forming grinding, is often a key issue in life. Form grinding has two problems:

First, the quality of the cutting piece, mainly because the cutting piece must have good self-tanning and shape retention, and the two are often contradictory.

The second is the cutting piece dressing technology, which is to obtain the required shape and sharpness of the cutting piece efficiently and economically. Therefore, in order to improve the efficiency and precision of grinding, especially for the efficient finishing of difficult-to-machine materials, CBN cutting blades are used for efficient and powerful grinding, which makes the powerful grinding break the limitation of traditional grinding, and the productivity is doubled. Some parts are The blank does not need to be roughed and can be directly ground into a finished product.

This not only improves the processing efficiency, but also improves the processing quality. Such as SG abrasives. It is a novel ceramic alumina abrasive which uses pure corundum as a raw material and combines it with water and other media such as magnesium oxide to produce a blocky gel which forms a brittle object after drying. Mill it to the desired particle size, from 1300 ° C to 1400 ° C to temperature
Sintered. Its hardness is much higher than ordinary alumina, and its toughness is good, so it can be operated under higher speed and large load conditions, and the metal removal rate is more than three times higher than ordinary alumina. Its biggest advantage is that the grinding zone has a low temperature, and the 14 inches cutting disc always has a sharp grinding edge, and the shape of the cutting piece is good and the time is long. Cubic boron nitride grinding. It is a hard and wear-resistant abrasive with excellent properties such as high thermal conductivity and chemical resistance. The latest generation of abrasives are characterized by sharp, high strength and can be used for unsupported cutting. These features reduce the grinding forces during grinding and reduce damage to the workpiece.

5 inch resin cutting disc for metal

 

 

 

 

 

Two different types of cutting blades

 

 

14 inches cutting disc

 

 

Toothed and round aluminum abrasive cutting disc are two different products, as the name suggests, one with serrations and one with rounded smooth cuts. What are the differences between the two in addition to the shape? The professional manufacturer of 14 inches cutting disc introduces the difference between toothed and round cutting discs.
1. The tooth-shaped cutting piece is sharp, the heat dissipation is good, the chip removal is smooth, and it is suitable for cutting relatively thick stone. The tooth shape needs to be different according to the specific material of the cutting material, the size of the raw material, the cutting equipment and the cutting parameters. The number of teeth of the saw blade, the tooth shape of the saw blade, and the precision of the saw tooth grinding, the grinding precision with the manual technology The content.
2, the circular cutting piece is suitable for the cutting material is relatively brittle, the thickness of the thin stone, the cut is more neat, the impact force is small. Dry circular cutting sheets are basically used to cut metal, such as steel bars. Use it to cool naturally after use. Wet means that it can be cooled by something like water.
4 reasons for the hardening phenomenon in the production of resin cutting sheets
Resin cutting sheet can add reinforcing fiber mesh and steel bar to the cutting piece, and has high strength characteristics, which is a tool with a large demand. Many people are familiar with its production process, but it is difficult to grasp it skillfully, especially the hardening phenomenon. It is reported that this phenomenon is mainly related to the following four points.
(1) The hardening temperature is low or too high;
(2) The time of the hardening curve is short: the temperature of the resin is the key, 100 ° C, 120 ° C is the key point;
(3) The furnace or the kiln is too urgent, and the temperature difference is too large;
(4) The problem of hardening the humid atmosphere of the hardened kiln.

The cutting sheets widely used in the market are 5 inch resin cutting disc for metal, which require extremely strong toughness and hardness in operation to ensure that they are not damaged. In order to improve quality and extend life, we tried to achieve the goal by adding plated abrasives.
In fact, the proper amount of plated abrasives in the binder in addition to its role in ordinary diamond abrasives, and a certain degree of protection for ordinary diamond abrasives. The plated abrasive has good bonding strength, heat resistance, pressure resistance and strong impact resistance, and is a good support point for the common ordinary diamond abrasives, thereby greatly reducing the ordinary diamond abrasive due to poor holding force and collision. The chance of falling off. However, it is still not practical to blindly refer to all foreign uses. By adding more than 20% of the plated TI and Ni diamond to the binder to replace the ordinary diamond abrasive, the life of the blade can be greatly improved without affecting the sharpness.

 

aluminum abrasive cutting disc

Analysis of the causes of the quality problems of cutting sheets

First, the raw material problem
The aluminum flat cutting disc is a complex system composed of a variety of main and auxiliary raw materials, the main materials are abrasives and bonding agents, and the auxiliary materials include fillers, reinforcing materials and the like.

1. Abrasive problems:

Abrasives are the main substances in the 5 inch resin cutting disc for metal for grinding. At present, the quality of abrasives on the market is mixed, and the main performances are as follows:

1) The chemical composition of the abrasive is often qualified, but the physical properties are poor, such as hardness, strength, self-sharpness, crush resistance, thermal stability, hydrophilicity, etc.;

2) The particle size composition of the abrasive is chaotic, which is quite different from the standard.

2, the binder problem:

In the dicing sheet, the abrasive particles are bonded together by a bonding agent, and the performance of the bonding agent directly affects the performance and quality of the dicing sheet.

1) The quality of the resin is unstable, and the free phenol content in the resin is high or low. The so-called free phenol is phenol remaining in the resin, the molecular formula is C6H5OH, long-term heating can crack the hardened resin, affecting the strength of the cutting piece;

2) The resin powder and urotropine are not evenly mixed. The scientific name of urotropine is hexamethylenetetramine ((CH2) 6N4). As a hardener for the resin, the amount of urotropine is insufficient, and the resin is hardened. Completely, affecting the strength and hardness of the cutting piece; if the content is too high, the excess urotropine is not combined with the resin, and is decomposed and volatilized during the hardening process, so that the pores of the cutting piece are increased, and the strength and hardness are lowered. The resin powder and urotropine are mixed unevenly, and the consequence is that the urodose content is too high or too low;

3) The particle size of the binder is too coarse. It is generally considered that the particle size of the binder is fine, which is advantageous for uniform distribution of the binder and favorable contact of the hardener. If the particle size is too coarse, the molding material is not easily mixed uniformly, which affects the hardness and strength of the cutting piece. Even for the coarse-grained resin fiber cutting disc Chinese supplier sheet and the enamel-shaped cutting sheet, the size of the binder (resin powder) selected should be finer than 320#. A fine-grained dicing sheet product is produced with a particle size requirement of a few microns.

Cutting sheet safety requirements

1. The grinding machine must have the power required to grind under the maximum allowable load to ensure the normal operating speed of the spindle of the cutting blade.
2. The direction of rotation of the spindle thread of the cutting piece: the direction of the thread of the end of the aluminum flat cutting disc of the cutting piece for fastening the cutting piece or the cutting piece chuck must be opposite to the direction of rotation of the cutting piece when it is working. When the above requirements are not met, measures must be taken to prevent the 5 inch resin cutting disc for metal or the cutting blade chuck from loosening when the spindle of the cutting blade is rotated.
3. The length of the spindle thread of the cutting piece must be ensured that the entire compression nut is screwed in.
4. The threaded portion of the main shaft of the cutting blade must extend into the pressing surface of the compression nut, but must not exceed one-half the length of the inner diameter of the minimum thickness of the cutting piece allowed for the design.
5. The tensile strength of the spindle material of the cutting piece is not less than 650 N/mm 2 and the elongation is not less than 10%.
6. The diameter of the cutting disc chuck shall not be less than one third of the diameter of the mounted cutting piece. The diameter of the cutting disc chuck for cutting the cutting piece shall not be less than one quarter of the diameter of the mounted cutting piece.
7. Any type of cutting disc chuck, the diameter of the left and right parts and the radial width of the pressing surface must be equal.
8. The cutting disc chuck must be able to reliably transmit the driving force to the cutting piece.
9. The cutting disc chuck should have sufficient rigidity and the tensile strength is not less than 415 Newtons/mm^2. The pressing surface must remain flat and evenly contacted after tightening.
10. Grind all the rotating parts on the machine, such as: cutting blades, motors, pulleys and workpiece head holders, etc., must be installed with a protective cover. The protective cover should be firmly fixed and its joint strength should not be lower than the strength of the protective cover.
11. The cutting piece guard is generally composed of a circumferential member and two side members, and the cutting piece, the cutting piece chuck and the end portion of the cutting piece spindle should be covered. Its main performance is: when the cutting piece is damaged due to work, it can effectively cover the pieces of the fiber cutting disc Chinese supplier to ensure the safety of personnel.
12. The cutting blade shield can be round or square. The maximum opening angle is not allowed to exceed 90°, and the upper half of the cutting blade must be covered at all times. The area above the horizontal plane of the spindle center line of the cutting blade shall not exceed 65°.