How do large-scale machinery processing plants and European and American grinding companies open the global market

With the continuous promotion and use of abrasive belt grinding technology in the domestic engineering machinery profession, and the continuous improvement and development of abrasive belt production technology, more varieties of abrasive belt grinders and equipment will be presented. It can be expected that the abrasive belt grinding process will receive due attention and further development in the construction machinery manufacturing industry.

In the engineering machinery profession, the traditional processing technology of some high-demand long shaft parts is generally rough turning, finishing turning, rough grinding and fine grinding. The finishing of parts processing mainly depends on the grinding wheel on the cylindrical grinding machine. Grinding to achieve. Regarding some slender rods with a large aspect ratio, Dongguan large CNC machinery processing plant, Guangzhou boring processing plant, Shenzhen large frame welding, grinding processing plant, large gantry milling machine processing, large CNC gantry milling machine processing, large computer Gong machinery processing plant, boring processing plant, q345 seamless pipe plant, q235 steel plate plant, aluminum-magnesium-manganese plate processing, a3 cold rolled plate processing, 45 steel processing such as various hydraulic cylinder piston rods, using general grinding wheel grinding Will be limited by the scale of processing, belt grinding is emerging with its obvious advantages.

  1 Overview

The abrasive belt grinding process is to put the ring-shaped abrasive belt on the outer circle of the touch wheel and the tensioning wheel. Under tension, the surface of the high-speed rotating abrasive belt touches the processing surface of the workpiece, and in a certain degree Under pressure, the relative frictional movement (cutting movement) produced by Dongguan large-scale CNC machinery processing plant, Guangzhou boring processing plant, Shenzhen large-scale frame welding, grinding processing plant, large-scale gantry milling machine processing, large-scale CNC gantry milling machine processing, large-scale computer Gong machinery processing plant, boring processing plant, q345 seamless pipe plant, q235 steel plate plant, aluminum-magnesium-manganese plate processing, a3 cold rolled plate processing, 45 steel processing is a process method for grinding the surface of the workpiece. Abrasive belt grinding is divided into two methods: wheel pressure type and belt pressure type, as shown in Figure 1.

Regarding the wheel pressure grinding method, that is, the touch wheel is pressed on the surface of the workpiece. At this moment, the axis distance between the touch wheel and the workpiece is A = 1/2 (D + d). Due to the high touch pressure, this type of grinding method removes metal in a unit time With large volume and high power, it is suitable for rough and fine grinding of inner and outer surfaces and planes. Regarding the pressure-type grinding method, that is, the surface of the workpiece is pressed by the abrasive belt. At this moment, because the tension wheel support is inclined to the workpiece by an angle α, the distance between the touch wheel and the workpiece axis is A′>1/2 (D＋ d). Compared with the wheel pressure grinding method, the pressure method has a smaller touch pressure, and the amount of metal removed per unit time is also small. It is mainly used for grinding arc surfaces, conical surfaces and other special-shaped surfaces, especially for finishing and polishing. the Lord.

　　 Abrasive belt, like the grinding wheel, belongs to a multi-tooth micro-edged cutting tool, and its processing characteristics are basically the same. The only difference is the shape.

　　2 Current development

In foreign countries, due to the rapid development of various types of belt grinders in some industrialized countries, the function of belt grinding has far exceeded the scale used for rust removal, rough grinding, polishing, etc., and its processing power is 5～5 for grinding wheel grinding. 20 times, the processing quality is comparable to conventional grinding methods, the processing accuracy has approached or reached the same level as the grinding wheel grinding, while the utilization rate of the machine tool power is higher than that of any metal cutting machine tool, and its use scale is all over Occupation, large CNC machinery processing plant in Dongguan, boring processing plant in Guangzhou, large frame welding in Shenzhen, grinding processing plant, large gantry milling machine processing, large CNC gantry milling machine processing, large computer gong machinery processing plant, boring processing plant, q345 no Seam pipe factory, q235 steel plate factory, aluminum-magnesium-manganese plate processing, a3 cold rolled plate processing, 45 steel processing can be used for grinding almost all materials (such as wood, rubber, various metals). According to relevant information, the annual output ratio of grinding wheels to belts in the United States is about 1:1. In the well-known engineering machinery company CaterPiller, belt grinding occupies an important position.

In China, some abrasive belt manufacturers such as Zhengzhou Baige Group (China Second Grinding Wheel Factory) and Shanghai Grinding Wheel Factory have successively introduced new high-voltage electrostatic sand planting techniques to ensure the "directional placement of abrasive grains on the surface of the belt." ", so that the abrasive belt has good sharpness. At the same time, with the development of the binder, the appearance of the water and oil resistant all-resin strong abrasive belt has made the grinding function of the abrasive belt significantly improved. Although the models of various abrasive belt grinders in our country are not yet complete, it is feasible to develop and use some abrasive belt grinding equipment.

　　3 Features of belt grinding

　　(L) Abrasive belt grinding is called "fast cutting method". The belt grinding power is high, reaching 10 times that of milling, and 5 to 20 times that of general grinding wheel grinding.

　　 (2) Abrasive belt grinding is also called "cold" grinding. Due to the low frictional heat generation during processing, and the long time interval for heat dissipation of the abrasive particles, it can effectively reduce the deformation and burns of the workpiece. The processing accuracy can generally reach the processing accuracy of a general grinding wheel grinder, and some scale accuracy has reached ±0.005mm, and the maximum can be Reach ±0.0012mm.

　　 (3) Abrasive belt grinding is called "elastic" grinding. Because the abrasive belt grinding and the workpiece are in a flexible touch, it has a good running-in and polishing effect, and the surface roughness of the workpiece can reach Ra0.8~0.2μm.

　　 (4) Abrasive belt grinding equipment has a simple structure, low production cost, and minimal wear of the touch wheel, which can make the abrasive belt maintain a constant speed, the transmission chain is short, and the power utilization rate of the machine tool can reach 85%.

　　 (5) There is little time to assist. After the workpiece is clamped and positioned once, the abrasive belt can be replaced repeatedly to complete all the processing, without the need for balancing and dressing operations like a grinding wheel.

　　(6) Strong adaptability, simple operation, safe and reliable.

4 The main structure and grinding amount of abrasive belt grinding equipment

　　 Belt grinding equipment has several different structures. One is the equipment that directly drives the abrasive belt by the output shaft of the motor. Large CNC machinery processing plant in Dongguan, boring processing plant in Guangzhou, large frame welding, grinding processing plant in Shenzhen, large gantry milling machine processing, large CNC gantry milling machine processing, large computer Gong machinery processing plant, boring processing plant, q345 seamless pipe plant, q235 steel plate plant, aluminum-magnesium-manganese plate processing, a3 cold rolled plate processing, 45 steel processing The other is the grinding belt driven by the motor through the grinding spindle Equipment, there is another type of equipment for internal grinding.

　　 Regarding the first device, its feature is that the touch wheel is directly installed and fixed on the output shaft of the motor with a 1:5 taper. The device has a belt tensioning and quick-change operating mechanism, see Figure 2. Since this kind of grinding equipment can be used for grinding on a variety of metal cutting machine tools with the aid of the clamping frame equipment, it is called a universal belt grinding equipment.

　　In this kind of equipment, the tension wheel and the touch wheel should be made of uniform nylon material. Since the touch wheel and the tension wheel are both high-speed rotating parts, the speed of the tension wheel can reach 5000r/min or more. To ensure safety and improve the operation stability of the entire equipment, dynamic balance experiments should be performed on these two parts after processing. Strive to minimize the unbalanced weight.

　　 The linear speed of the abrasive belt is limited by the maximum allowable limit, and is generally selected as 25m/s. The longitudinal feed of the abrasive belt along the axis of the workpiece per revolution of the workpiece is generally controlled within half of the width of the abrasive belt, which can be appropriately reduced during finishing. In addition, the grain size of abrasive grains is directly related to the surface roughness of grinding. The smaller the grain size, the lower the surface roughness value after grinding. When using, make sure that there is enough cooling lubricant and corresponding dust removal equipment.

　　5 Development direction of belt grinding

Compared with the usual processing methods, abrasive belt grinding is indeed a high-quality, efficient, large-scale CNC machinery processing plant in Dongguan, Guangzhou boring processing plant, Shenzhen large frame welding, grinding processing plant, large gantry milling machine processing, large CNC gantry milling machine processing, large computer gong machinery processing plant, boring processing plant, q345 seamless pipe plant, q235 steel plate plant, aluminum-magnesium-manganese plate processing, a3 cold-rolled plate processing, 45# steel processing, novel processing methods with low consumption . At the same time, with regard to long shafts or thin-walled sleeve parts with poor rigidity, it is feasible to plan and produce some abrasive belt grinding equipment with simple structure, simple production and convenient operation. It is feasible for the equipment to replace grinders on general-purpose machine tools for efficient finishing. of.

　　 Abroad, abrasive belt grinding technology is developing in the following directions:

　　 (1) The power of the machine tool continues to increase. Abrasive belt grinders over 200kw are now available.

　　 (2) Improve the speed of the abrasive belt. The development of high-speed belt grinders above 100m/s is underway.

　　(3) Increase the width of the abrasive belt and increase the processing power, the widest has reached more than 4.9m.

　　 (4) Extend the service life of the abrasive belt. It has progressed from the initial 2～4h to the current 8-12h.

(5) With the continuous improvement of abrasive belt grinding, large-scale CNC machinery processing plants in Dongguan, boring processing plants in Guangzhou, large-scale frame welding in Shenzhen, grinding processing plants, large-scale gantry milling machine processing, large-scale CNC gantry milling machine processing, large-scale Computer gong machinery processing plant, boring processing plant, q345 seamless pipe plant, q235 steel plate plant, aluminum-magnesium-manganese plate processing, a3 cold-rolled plate processing, 45 steel processing unit, the amount of grinding within a time can reach general metal cutting The amount of cutting per unit time of the machine tool changes the abrasive belt grinding from finishing to the stage of powerful grinding, and presents a trend of using grinding instead of turning, grinding instead of milling and grinding instead of planing.