Many factors cannot be ignored during grinding of alloy circular saw blades

1. Large deformation of the matrix, inconsistent thickness, and large tolerance of the inner hole. When there is a problem with the above-mentioned congenital defects of the substrate, no matter what type of equipment is used, there will be grinding errors. The large deformation of the substrate will cause deviations on the two side angles; the inconsistent thickness of the substrate will cause deviations on both the relief angle and the rake angle. If the accumulated tolerance is too large, the quality and accuracy of the saw blade will be seriously affected.

2. The influence of gear grinding mechanism on gear grinding. The quality of the gear grinding of the alloy circular saw blade depends on the model structure and assembly. At present, there are about two types of models in the market: the first type is the German floater type. This type adopts vertical grinding pin, all advantages adopt hydraulic stepless motion, all feed system adopts V-shaped guide rail and ball screw work, grinding head or boom adopts slow advance, retreat and fast retreat, and the clamping oil cylinder is adjusted. The center, the support piece is flexible and reliable, the tooth extraction is accurate positioning, the saw blade positioning center is firm and automatic centering, any angle adjustment, the cooling and washing is reasonable, the man-machine interface is realized, the grinding precision is high, the pure grinding machine is reasonably designed; the second type is the current horizontal type , Such as Taiwan and Japan models, the mechanical transmission has gears and mechanical clearances. The sliding precision of the dovetail is poor, the clamping piece is stable, the center of the support piece is difficult to adjust, the gear extraction mechanism or the reliability is poor, and the two sides of the plane and the left and right rear angles are not in the same center grinding. Cutting, resulting in large deviations, difficult to control the angle, and large mechanical wear to ensure accuracy.

3. Welding factors. The large deviation of the alloy pair during welding affects the grinding accuracy, resulting in a large pressure on the grinding head and a small pressure on the other. The back angle also produces the above factors. The poor welding angle and human unavoidable factors all affect the grinding wheel during grinding. Factors have an unavoidable impact.

4. Influence of grinding wheel quality and grain size width. When choosing a grinding wheel to grind alloy sheets, pay attention to the particle size of the grinding wheel. If the particle size is too coarse, the grinding wheel will produce traces. The diameter of the grinding wheel and the width and thickness of the grinding wheel are determined according to the length and width of the alloy or the different tooth profiles and the various surface conditions of the alloy. It is not the same as the specifications of the back angle or the front angle. Specification grinding wheel.

5. The feed speed of the grinding head. The grinding quality of alloy saw blades is completely determined by the feed speed of the grinding head. Generally, the feed speed of alloy saw blades should not exceed this value at 0.5 to 6 mm/sec. That is, each minute should be within 20 teeth per minute, which is more than per minute. If the 20-tooth feed speed is too high, it will cause serious knife edges or burnt alloys, and the convex and concave surfaces of the grinding wheel will affect the grinding accuracy and waste the grinding wheel.

6. The feed rate of the grinding head and the selection of the size of the grinding wheel are extremely important for the feed rate. Generally, it is recommended to choose 180# to 240# for grinding wheel, and 240# to 280# for the most quantity, not 280# to 320#, otherwise, the feed speed should be adjusted.

7. Grinding center. The grinding of all saw blades should be centered on the base, not the edge of the knife. The surface grinding center cannot be taken out, and the machining center for the back and front corners cannot grind a single saw blade. The saw blade in the three processes of grinding The center cannot be ignored. When grinding the side angle, observe the alloy thickness carefully. The grinding center will change with different thicknesses. Regardless of the thickness of the alloy, the center line of the grinding wheel and the welding position should be kept in a straight line when grinding the surface, otherwise the angle difference will affect the cutting.

8. The tooth extraction mechanism cannot be ignored. Regardless of the structure of any gear grinding machine, the accuracy of the extraction coordinates is designed to the quality of the knife. When the machine is adjusted, the extraction needle is pressed at a reasonable position on the tooth surface. Flexible and reliable.

9. Clipping mechanism: The clamping mechanism is firm, stable and reliable. It is the main part of the sharpening quality. During any sharpening, the clamping mechanism should not be loose at all, otherwise the grinding deviation will be seriously out of control.

10. Grinding stroke. Regardless of any part of the saw blade, the grinding stroke of the grinding head is very important. Generally, the grinding wheel is required to exceed the workpiece by 1 mm or exit by 1 mm, otherwise the tooth surface will produce a two-sided blade.

11. Program selection: Generally, there are three different program options for grinding knife, coarse, fine, and grinding, depending on the product requirements, it is recommended to use the fine grinding program when grinding the rake angle at the end.

12. The quality of gear grinding with coolant depends on the grinding fluid. A large amount of tungsten and emery wheel powder are produced during grinding. If the surface of the tool is not washed and the pores of the grinding wheel are not washed in time, the surface grinding tool will not be able to grind the smoothness, and the alloy will burn if there is not enough cooling.

How to improve the wear resistance and accuracy of alloy circular saw blades in China’s sawing industry at present is conducive to frequent competitiveness。

It is an undisputed fact that China’s sawing industry has rapidly moved to the world in the past ten years. The main factors are: 1. China has cheap labor and a cheap commodity market. 2. China’s electric tools have developed rapidly in the past ten years. 3. Since China’s opening up for more than 20 years, the development of various industries such as furniture, aluminum products, building materials, plastics, electronics and other industries has been at the forefront of the world. The industrial revolution has brought us unlimited opportunities. my country’s saw industry mainly produces and exports foreign households. The Chinese sawing industry basically occupies more than 80% of the world’s market for this piece of cake and the supporting market for power tools, with more than 20 billion yuan per year. Because our quality is not high, foreign merchants cut prices for exports, resulting in sales in the sawing industry. The profit is very small. Because there is no industry association to fight for each other, the market price is chaotic. As a result, many companies neglect to strengthen hardware, improve technology and craftsmanship, and their products are developing in a high-end direction. Of course, in recent years, some sawing industries have a high awareness of the industry. The development of high-end products has achieved remarkable results. Last year, foreign branded product companies began to gradually customize OEM production to these companies. Some companies must be Chinese companies with comparable quality, branded products and well-known companies from a few years later.

Our country’s industrial alloy circular saw blades have long relied on imports, and annual sales in the Chinese market have reached nearly RMB 10 billion in sales value. Almost dozens of imported brands such as Rui Wudi, Letz, Leke, Yuhong, Israel, Kanfang, and Kojiro occupy 90% of the Chinese market. They see that the Chinese market is in great demand, and some companies have invested in factories in China. Guangdong and some domestic companies are clearly aware that they have also started production and research and development a few years ago, and some companies’ products have reached the quality of foreign companies. For more than ten years, saw Chinese companies such as woodworking machinery, metal industry, building materials, electronics, furniture, plastics and other companies use imported brand products. We can’t help but cry for our sawing industry. And the 2008 National Hardware Exhibition, in-depth investigation to understand that the development of my country’s sawing industry is full of hope. Domestic enterprises have more and more mature equipment and hardware, more and more varieties, and more and more awareness of saw-making technology and craftsmanship. Although the wolf is coming, with the smart will of our Chinese people, I believe that with our joint efforts, the quality of China’s sawing industry will improve step by step.