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The unique feature of honing processing is that other cutting operations are irreplaceable, so it has been greatly developed in recent years and has been widely used. Previously, the development of China's honing technology was relatively lagging. The high-end market of honing products was mainly occupied by a few large companies such as Germany, the United States, Italy, and Japan. Importing a high-precision vertical honing machine would cost at least several hundred thousand. Millions of euros, coupled with high tool cost, have made many user companies discouraged, and even companies complain that their profits are used to purchase honing tools. After decades of unremitting efforts by Chinese people, Chinese companies have gradually occupied a place in the world of technology, breaking the monopoly of foreign companies, and bringing benefits to Chinese processing companies. The following is an introduction to some advanced honing techniques using exhibits as an example:
1. Host technology advancement (1) Operational intelligence
The honing process is a very complicated process. The spindle rotation, spindle reciprocation, spindle reversal, feed of the grinding stone, cooling system and other factors all affect the precision of the machined parts. Only when the experiment is repeated and the parameters are adjusted during the actual machining process, reliable honing accuracy can be obtained. In this respect, Germany Green's lifehone series of high-precision honing control unit uses Green's special control system, the system has a program assistant function, after inputting a little workpiece material and tool data, the relevant parameters will be automatically calculated. In addition, all data and machining programs are stored. For any level of honing, the program assistant will help simplify the operation and make the processing easy to understand.
(2) High efficiency of processing
At this exhibition, almost all honing manufacturers exhibited CNC sequential honing machines, which were processed in a size sequence using a set of diamond reamers of different diameters. Each diameter tool only made one reciprocating cutting action. After all the tools are processed, the final part size requirements are met. Order honing can achieve higher production efficiency and better geometric accuracy, and it is easy to maintain the uniformity of part size. For example, the B3HM-022 CNC sequence honing machine of Beijing No. 1 Machine Tool Plant, the VSS-2 series honing machine of SUNNEN and the sequential honing machine of Beijing Dazu can achieve the processing of roundness of 0.0015mm and column degree of 0.002mm. Precision.
(3) Design is pleasant and green
Under the impact of new technologies, China's machine tool manufacturing industry has gradually changed from the old-fashioned structure with simple functions and simple protection to the diversified processing functions, beautiful appearance and more ergonomics. The beautiful and clean outer cover ensures a safe and stable operating environment, and the removable side cover plate facilitates the addition and integration of the automatic loading and unloading system. A simple example is the sequence of Beijing Dazu. When the workpiece is in the loading and unloading station, a micro-cylinder will push the finished workpiece away from the normal loading and unloading position to ensure the correct installation of the next workpiece.
At the same time, green concepts such as energy saving, resource conservation and other resources are also reflected in the exhibits. For example, the machine tool work light of Rijin Company has the function of automatic opening and closing. If the machine is on standby for more than 30 minutes, the work light of the machine will be automatically turned off. When the machine is restarted, the work light will light up, and strive to reduce the power consumption while operating at high efficiency. .
2, peripheral technology advancement (1) control system precision, digitization
With the development of industry and the advancement of technology, the automation requirements are getting higher and higher, and the guarantee of product quality is gradually developed from manual experience to equipment automation control. For example, the CNC honing machine controlled by the Yinchuan Dahe five-axis digital control system, the spindle reciprocating is to directly drive the servo proportional valve to realize the control of speed, acceleration and reversing position, and can realize short stroke grinding, and the reciprocating commutation precision can reach 0.5mm, which is a relatively advanced control concept in the field of honing machines. In addition, they also applied this control technology to another brake hub honing machine. The on-site simulation processing is softer and the commutation position control is more accurate.
(2) Diversified optional accessories
With the development of honing technology, more and more optional accessories for honing machine tools, such as multi-axis, multi-column, multi-step machining process, automatic loading and unloading device, online and post-line measurement system and control feedback, oil Fog elimination system, cooling filter system and other functional accessories, as well as single-axis honing process with post-measurement. The extended dual-axis and post-measurement has double processing capacity, coupled with automatic loading and unloading system, the machine can be changed into a large Batch high output equipment. In addition, Green also introduced an automatic tool change system, and Nagel introduced industrial robots.
(3) Measurement system dynamics
At present, the online pneumatic measurement technology is widely used in honing processing, and has a high measurement accuracy in the linear range of the measuring instrument, generally about 0.004-0.008 mm. The United States has demonstrated an online measurement feedback system. The principle is to measure the previous piece (N-1 pieces) during the processing of the Nth part of the machine tool, and send the measurement signal to the control system. The system is identified and the accidental error is filtered out. And the coarse error, the determined system error is compared with the input constraint value, and the correction parameter calculated by the mathematical model is sent to the actuator, and the parameters such as the feed amount or the cutting time are changed to control the dimensional dispersion. The system can control the dimensional accuracy of 0.004-0.006mm.
We have witnessed the progress and changes of the domestically produced honing technology in each exhibition. The gap with the international top honing technology has been gradually reduced. We deeply feel the persistence and efforts of the domestic honing people, and make the domestic honing grow from a young baby to a sunshine. Youth, energetic and energetic.
Looking at advanced honing technology from CIMT2015
Abstract The 14th China International Machine Tool Show (CIMT2015) brings together the most advanced and practical machine tool products in the world. The well-known domestic and foreign grinding machine manufacturers have exhibited the most representative products. It can be said that the honing machine tools of this exhibition are basically Represents the most advanced...
The 14th China International Machine Tool Show (CIMT2015) brings together the most advanced and practical machine tool products in the world. The well-known domestic and foreign grinding machine manufacturers have exhibited the most representative products. It can be said that the honing machine tools represented at this exhibition are basically representative. The most advanced honing technology and process.