Honing is a machining method that uses a group of diamond (or cubic boron nitride) honing heads with different diameters according to the size order, and each grinding head only makes one reciprocating cutting action in turn. After all the honing heads are machined, the final part requirements are met. The sequential honing technology is developed on the basis of traditional honing, which combines honing method with reaming method, so it is also called honing; in addition, sequential honing generally only has one reciprocating action, so it is also called single stroke honing
The characteristics of sequential honing mainly lie in its sequential honing head and actual honing process. Compared with the traditional honing process, the honing head of sequential honing has been set to the final machining size required by the workpiece in advance. Therefore, the cutting process of sequential honing only needs 1-3 reciprocating strokes. The thickness of metal layer removed by each honing head is 2-20 μ M. The shape and dimension accuracy of the hole can be improved by one level after the sequential honing, and the surface roughness value can reach Ra0.2. This processing method does not need tool feed, the processing time is fast, and also can improve the position accuracy of the hole to a certain extent.
Compared with ordinary honing machine, sequential honing machine has some advantages in processing beat, dimensional stability, shape and position accuracy. However, the domestic users of this honing machine tool used to rely entirely on imports. Because of the high price of machine tools, machine accessories and after-sales service, many users are deterred from importing sequential honing machines. The users who have the ability to purchase imported sequential honing machines also affect their production due to the lack of timely technical support from imported machine tools. Until the beginning of 2008, the third machine tool branch of Beijing No. Compared with foreign manufacturers which have developed for many years, they started later, but started higher. The sequential honing machine tools produced by them have been favored by many users as soon as they come into being, and have achieved multiple sales.
The machine tools they produce adopt German Siemens Servo motor and 810D numerical control system to realize the flexible adjustment of reciprocating speed and position, realize the real-time detection of processing torque of each processing shaft and set overload alarm; adopt German fibro rotary table, which has accurate positioning and fast speed, and the transposition time of each station reaches 0.69s; the rolling guide rail and ball screw of Japan THK can realize this At present, the spindle box is stable and accurate reciprocating; the honing tool, tool extension rod and workpiece fixture are all of full floating structure, which can ensure high honing accuracy: roundness: 0.001 mm, cylindricity: 0.002 mm, roughness: Ra0.2 μ m; processing beat is 9s / piece. Their machine tool also adopts modular design, and the number of spindles and turntable stations can provide users with the best processing scheme according to the process requirements of users and their parts. In recent years, with the batch launch of domestic medium-sized CNC machine tools, some high-end CNC machine tools began to enter the core manufacturing field of key industries, and were initially applied.
At the high-level forum of CNC machine tool exhibition, the equipment utilization rate of similar imported machine tools was 89.5%, and the domestic equipment was basically close to the same level of foreign equipment. “
As the user side of domestic CNC machine tools, the main problems of domestic CNC machine tools are the lack of design and innovation ability, slow response speed, no serial and high maturity CNC system, the quality of accessories needs to be improved, and the overall service awareness is weak.
According to the special plan for high-end CNC machine tools and basic manufacturing equipment, by 2020, about 80% of the high-end CNC machine tools and basic manufacturing equipment required by aerospace, shipbuilding, automobile and power generation equipment manufacturing will be based in China, which requires the industry to focus on the automobile, machinery manufacturing, military and other key downstream industries.
Experts suggest that the machine tool industry in the “Twelfth Five Year Plan” period should develop high-end market segments, focus on the product and process requirements of high-end customers and major customers, and provide personalized services according to the needs of customers. At the same time, we should closely track the development of strategic emerging industries and provide them with advanced and applicable machine tools and equipment.
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