In the process of parts processing, mechanical processing technology has a very important impact on the precision of parts processing, these effects are generally imposed in a direct way to the parts processing link. Mechanical processing technology is a system engineering, in this project, there are a lot of parts, in the common link of these parts, constitute the machinery processing of this huge system. Only in-depth search for the cause, and its in-depth analysis, in order to ensure the precision of parts in the process of processing.
First, the introduction of mechanical processing technology
Mechanical processing technology refers to changing the size, geometric shape, nature and position of the production object in a certain way in the process of processing process flow, so as to promote the production object to achieve the purpose of the transition to the finished product or semi-finished product. The machining process can be divided into two aspects: process flow and process regulation. Process regulation is mainly to document the relevant contents of the process flow for easy reference and reference. The technological process is essentially the concrete implementation process of mechanical processing technology. For example, the conditions of equipment, artificial quality and product quantity and other processing links involved in the information to determine.
Second, parts processing technology analysis
The analysis of parts processing process content can start from the parts processing link, according to the heat treatment, turning, interpolation spline, gear hobbing, heat treatment, universal grinding, gear grinding, these seven parts processing link to carry on the processing process analysis, in order to improve people’s understanding of the parts processing technology.
1, heat treatment: the heat treatment process here has become a preliminary heat treatment, mainly through normalizing the stability of the material to improve, reduce the probability of deformation in the subsequent work.
2. Turning: the turning process is mainly to correct and tighten the left end, flatten the right end face, and drill to? 25mm; Turn around, four claw head live, correct the outer circle and end beat ≤0.02mm and clamp firmly.
3. Insert the spline: tighten the left end, correct the right end face and the end face runout ≤0.02mm, make the marking direction should be consistent with the high position, and then clamp, and then insert the internal spline until it meets the requirements of the drawing.
4, gear hobbing: this process is mainly correction and clamping process as above, gear hobbing retention grinding amount, deburring.
5, heat treatment: in the processing link, the carburizing, quenching process to meet the requirements of the drawings, at the same time, in this process, in order to ensure the surface of the parts of the mutual position accuracy, uniform post-processing allowance, less to reflect the error, it is appropriate to use a unified calibration base and calibration clamping.
6, universal grinding: this process requires four claws clamp head live, clamp the right end, correct the left end of the outer circle and end beat ≤0.02mm; The high point of this operation should be in the same direction as the marks made in operation 2. Turning and should be clamped.
7. Gear grinding: It is required to live on the 1:400 mandrel, install it tightly, correct the tooth position, and grind the gear to the requirements on the drawing to send it for inspection and storage.
Third, the impact of mechanical processing technology on parts processing accuracy
1. In the machining process, the influence of hot deformation on the machining accuracy of parts
This link has a more serious impact on the precision of parts processing compared with other aspects. Because in this construction link, the operation of the parts of the operator is smaller, just before processing, some equipment, tools and fixtures as far as possible in accordance with the requirements to straighten, but in the heating shaping link, to make the corresponding technical adjustment there are great difficulties. Because it is the high temperature of the parts, so in this link, there are also workpiece heat deformation, tool heat deformation and machine tool heat deformation, these conditions will have a certain impact on the precision of parts processing.
2. In the machining process, geometric deformation affects the machining accuracy of parts
Machine tool, fixture, tool and workpiece constitute the four parts of the mechanical processing technology system, each link of the operation error will lead to the mechanical processing technology system problems. The axial swing of the machine tool and the radial axis of the spindle will affect the machining accuracy of the parts, because in the processing link, different types of parts for processing requirements is there is a certain difference, if in the processing link, the position of the machine tool is not correct, the Angle of the fixture deviation, the workpiece and the workpiece operation error, will make the parts processed geometric deformation. Therefore, special attention should be paid to the influence of geometric deformation on the precision of parts in the machining process.
3. In the machining process, the influence of stress and deformation on the machining accuracy of parts
Parts in the process of processing, to bear all aspects of the applied force, especially in the cutting link, processing parts have to bear the role of gravity, cutting force and clamping force. Under the action of these forces, some changes have taken place in the parts. The shape, size and size of the parts are different from each other in their positions and the standards in the design drawings. That is, the parts bear too much force and there is a certain difference between the processed shape and the design requirements. In order to solve the problem of force deformation of parts and improve the accuracy of parts processing, operators need to carry out detailed research on this aspect and formulate corresponding solutions.