Contact Person : Perfect
Phone Number : 18575535002
November 9, 2022
Arrangement principle of machining sequence of bed parts
1. Principle of lathe from rough to finish: the machining sequence of each surface shall be semi finish machining according to rough machining leaves_ Finishing_ The precision machining shall be carried out in sequence to gradually improve the machining accuracy of the surface and reduce the surface roughness value.
2. The principle of lathe datum first: the surface used as precision datum shall be processed first, because the more accurate the surface of positioning datum, the smaller the clamping error. Since the inverted 40 outer circle is the benchmark of coaxiality, the lathe should first process this surface, and then process other surfaces.
3. The principle of lathe priority: the main working surface and assembly base surface of the parts shall be processed first, so that possible defects on the main surface of the blank can be found as early as possible. The secondary surface of the lathe can be alternated and placed after the main processing surface has been processed to a certain extent and before the final finishing.
4. The principle of turning from near to far: Generally, after the workpiece is clamped, the parts close to the tool rest are processed first, and the parts far away from the tool rest are processed later, so as to shorten the tool travel distance and reduce the idle stroke time. It is also conducive to maintaining the cutability of blanks or semi-finished products and improving their cutting conditions. For the inner hole of lathe parts, the inner cone hole shall be processed first, and then φ 30mm inner hole, final machining φ 20mm inner hole.
Key processing technologies:
The key technology of precision machining of lathe parts. Conventional machine tool design and manufacturing have great tolerance in all aspects of technology. Each link of ultra precision machine tool is basically in a state of technical limit or critical application. Any link that is not considered or handled properly will lead to overall failure. Therefore, it is necessary to have a very comprehensive and profound understanding of the whole machine tool system and each part of the technology in design. It is necessary to carry out the comprehensive design in a very detailed way based on the feasibility and the overall optimization. High rigidity and high stability machine tool body structure design and manufacturing technology. Especially for LODTM machine tools, due to the large body, its own weight, and the large change in the weight of the bearing workpiece, any small deformation will affect the machining accuracy. In addition to meeting the requirements in terms of materials, structural forms and processes, the structural design must also take into account the operability of the machine tool during operation.
Ultra precision spindle technology for lathe parts. The scheme of aerostatic spindle is often adopted for medium and small machine tools. The aerostatic spindle has small damping and is suitable for high-speed rotary machining applications, but its bearing capacity is small. The rotary accuracy of aerostatic spindle can reach 0.05 μ m。 The spindle of LODTM machine tool bears large size and weight of workpiece, so hydrostatic spindle is generally preferred. Hydrostatic spindle has large damping, good vibration resistance and large bearing capacity, but it needs to take liquid cooling and constant temperature measures because of its high speed heating. Hydrostatic spindle rotation accuracy can reach 0.1 μ m。 In order to ensure the accuracy and stability of the spindle, both the air pressure source and the hydraulic pressure source need constant temperature, filtering and pressure precision control processing.
High precision air, liquid, temperature, vibration and other working environment control technologies for lathe parts. Vibration isolation and horizontal attitude control of machine tool. The influence of vibration on ultra precision machining is very obvious, even for long-distance vehicles. Special foundation treatment and air floating vibration isolation composite measures shall be taken for machine tool vibration isolation. The air floating vibration isolation system of the machine tool body shall also have the automatic leveling function to prevent the influence of the horizontal state change on the processing during the processing of the machine tool. For machine tools with high LODTM vibration isolation requirements, the natural frequency of the vibration isolation system is required to be below 1HZ.
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