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Zhejiang Hangzhou Machine Group, hydraulic break processing problems

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Hangzhou Machine Group recently received the 20 10 Science and Technology Progress Award MKB7025 Hangzhou high-speed railway track board dedicated CNC grinding machine, the product and the rotor groove grinder, CNC grinding machines and so are the powerful shape of Hangzhou Machine's flagship product.

    
As the world construction machinery industry, one of the hallmarks of revolutionary change, hydraulic mechanical transmission instead of mechanical transmission is called disruptive technology.

    
However, the industry has been the case describe the current situation of the hydraulic components industry - the pre-dawn darkness. Over the years, the domestic industry, hydraulic parts recognized the existence of two technical problems: a vane pump rotor slot and other products processing, and the other is the cycloidal gear machining. Processed into the two parts of the hydraulic industry, production bottlenecks, limiting production.

    
However, Hangzhou Machine Tool Group Co., Ltd. (hereinafter referred to Hangzhou Machine Group) has developed a strong CNC creep feed grinding products forming the hydraulic components industry seems likely to break the darkness before the dawn.

    
In recent years, Hangzhou Machine Group continued to invest in developing CNC creep feed grinding products forming a strong, actively grinding process to solve the rotor slots and the cycloid wheel grinding problems. Currently it provides efficient processing machine has been used in actual production, the hydraulic industry praise and welcome.

    
The first breakthrough

    
Many in the industry, hydraulic pumps, especially in vane pumps, vane hydraulic motor, the rotor and stator is the most important parts, the processing of these parts, especially the rotor slot grinding is the key. Because the accuracy of rotor slot greater impact on the pump, vane pump rotor has a high geometric accuracy and dimensional accuracy. In addition, the part dimensional accuracy, geometric tolerance and surface roughness are demanding, the difficulty of processing is higher. Hydraulic vane pump as an important component to improve the quality of the technical progress of the hydraulic components industry is critical. Processing of the rotor, the core technology is the notch grinding.

    
Although the domestic industry, the manufacturers can grinding volume manufacturing rotor slot special grinder, the same time, China has emerged in recent years, some manufacturers of such equipment, machine tool plant, hydraulic components to meet the general needs of industry users. However, compared with foreign advanced level, special grinding rotor slot made in the processing accuracy, precision consistency, efficiency, operation and other aspects of human nature can not meet the needs of users. Therefore, in the hydraulic industry, some manufacturers, finishing with a grinding rotor slot or to rely on imported machine tools, such as international brands Schleifring Grinder Group BLOHM, Maegerle company and Japan's YASDA, especially the famous Swiss Maegerle grinder company.

    
In recent years, as technology advances, hydraulic components industry rotor slot precision, surface roughness and the increasingly stringent requirements of processing efficiency, coupled with the application of large-sized rotor is gradually increased. Urgently needed, say, the ship's hydraulic motor manufacturing requirements of large grinding rotor, rotor diameter, thickness, surface hardness, tolerances and other requirements are higher. The availability of domestic equipment can not meet existing needs, particularly the lack of rotor slot for forming large-sized grinding machine.

    
Hangzhou Machine CNC Group as the largest production base of grinding forming strong in recent years, is to carry forward the spirit of technological innovation, rely on form grinding know-how accumulated in the area, with increasingly sophisticated numerical control technology, advanced indexing techniques and CBN abrasives , hydraulic parts for industry to actively develop high-end user processing precision, large format needs a new generation of rotor slot grinding.

    
February 2008, the first station MKL7132 × 8 / 5 CNC forming grinder rotor slot provided strong Hengtong technology companies in Ningbo, the user is supporting the production of marine hydraulic motor rotor and stator of the professional manufacturers, verified by the company's actual production, machine tools the use of good. May 2009, and a Wuhan Marine Machinery Company built a larger size, higher technological content of the rotor slot grinding MKL7150 × 10 / 6. The company is the production of large ships winches, lifting bodies of the professional factory, the production of large hydraulic motors used in large-scale rotor has been imported from Japan, not only the high cost and risk-resisting ability is poor, many restrictions. The successful development of the machine tool to help users achieve greater trochanter produced domestically.

    
And compared to the similar rotor slot grinding, these two machines have more innovations in the structure. Machine equipped with rigid better able to withstand large-sized rotor fixture, positioning, reliable, compact design. And MKL7132 × 8 / 5, compared, MKL7150 × 10 / 6 CNC grinder rotor slot adds a technological innovation positioning mechanism for each slot, before grinding can be fine positioning of each slot. In addition to machine tool technology itself, but also on the rotor slot with a CBN grinding wheel for grinding a vital, this can greatly reduce the wheel off of the rotor slot width.

    
In recent years, domestic CBN grinding wheel manufacturing technology matures, the use of cheaper machine-made CBN grinding wheel, to achieve high-precision grinding of rotor slot requirements, it is also important, because users in the economy can withstand. Meanwhile, CBN grinding wheels can be repaired, repair time can grind 80 rotor. Grinding margin is 0.3mm in the unilateral cases, the grinding speed 80mm/min. Each wheel can process hundreds of the rotor, close to the foreign advanced level. It is reported that, MKL7150 × 10 / 6 CNC grinder rotor slots has been used since the delivery of a normal full capacity of production, and all types of rotor slot can be done in the machine bed. Better than similar domestic machine tool production efficiency, reaching levels similar foreign machines.

    
Another problem

    
Based on the development of rotor slot grinding machine, hydraulic components industry users of Hangzhou Machine Group's products more and more confidence, but the Hangzhou Machine Group does not stop there, their empathy for the needs of users.

    
Products in the hydraulic motor, cycloid wheel is a key part, and its precision directly affects the entire organization's performance. For a long time, due to strong domestic CNC forming grinder lack of equipment, cycloid tooth profile surface processing mostly through slotting machine, CNC wire cutting, milling cutter way to achieve, due to complex shape cycloidal tooth profile, manufacturing is difficult, due to the low efficiency of these processing methods, low precision and poor tooth surface roughness, can not meet the requirements of mass production, a direct impact on gear and hydraulic motor, pump performance.

    
With the rapid development of machinery industry, high-speed, heavy cutting, high-precision processing technology to gradually replace the conventional processing methods. Requirements with special surface finishing cycloid tooth profile surface, CNC forming widely used abroad, grinding technology, this grinding method and grinding process cycloid generating method has obvious advantages in comparison. The processing method is the use of powerful CNC forming grinder, the use of form wheel dressing technology trimmed cycloidal shape of single-tooth profile surface, and through the rotary indexing mechanism for a strong piece of cycloidal shape creep feed grinding, to directly shape teeth profile. With high efficiency, high precision and good surface roughness because the use of numerical control machine can achieve more than one management style to meet the needs of mass production, but also improved product performance.

    
Processing problems for cycloidal, Hangzhou Machine Group has successfully developed a grinding wheel can be used for cycloid MKL7132 × 8 CNC forming grinder strong. Machine tools imported diamond roller, and with high rigidity wheel dresser, wheel dressing tooth surface so that efficient and accurate meshing degree of grinding efficiency and a reliable guarantee. Meanwhile, the machine tool with automatic balance wheel device that can effectively remove the wheel itself and the result after finishing grinding wheel unbalance caused in improving the accuracy of the grinding surface while maintaining its quality. The amount of wheel dressing can also automatically compensate and maintain consistency of workpiece sizes, improve precision and interchangeability. Grinding wheel spindle and spindle are used with independent intellectual property rights of low-pressure oil mist seal device to prevent high-pressure coolant into the spindle system, effectively guarantee the accuracy of the spindle and bearing a long life. Body heat balance by grinding spindle thermal expansion control device to ensure the accuracy of lateral grinding. Machine tool automation and high reliability, in the grinding process, in addition to the handling and measurement of the workpiece, the periods are done automatically, improve production efficiency, reducing the operator's labor intensity.

    
MKL7132 × 8 CNC forming grinder powerful hydraulic parts manufacturer to a national launch, has been widely welcomed. Breakthrough time and time again, so Hangzhou Machine Group received good economic benefits, more domestic hydraulic technology industry provides a good upgrade equipment.

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