With the use of CNC machine tools, my country's processing and manufacturing industries are developing rapidly, and the requirements for the number, precision, and efficiency of parts processing are getting higher and higher, and the demand for precision parts in various fields is also increasing. From the perspective of parts processing, the processing of disc-shaped thin-walled parts is more difficult than other ordinary parts. In particular, the processing of precision disc-shaped porous parts requires high precision and relatively complex processes. many. To ensure the machining accuracy of the parts, it is necessary to select the appropriate machine tool and determine the scientific and feasible processing path and technology, in order to process and manufacture the precision parts that meet the requirements.
Precision disc-shaped porous parts have high requirements on accuracy, which are difficult to meet with ordinary machine tools and processing techniques. Moreover, the parts are thin-walled disc-shaped parts, which are easily deformed during processing, which makes the overall accuracy requirements high and difficult to process Therefore, in addition to choosing a high-performance machine tool and establishing a scientific processing technology plan, the selection of fixtures and clamping forces must be specially set. After many tests and modifications, a complete set of processing plans was obtained. The test samples met the processing requirements, and the feasibility of the processing plan was determined.
I. Selection of machine tool and determination of processing method
After comparison and analysis, a coordinate boring machine with high-precision coordinate positioning device and good rigidity was selected to perform machining tasks. This machine tool has excellent performance in plane milling and aperture machining. The indexing method is selected for the processing of the part holes. The high-precision indexing disc-type digital display turntable is installed on the machine tool table, and the parts are processed on the turntable, so that the different positions of the processed parts only need to rotate the turntable.When processing the hole of the part, the turntable remains fixed. The installation of the turntable is very important. The rotation center of the parts and the rotation center of the turntable should maintain a high degree of coincidence. the indexing error should be controlled within a small range as much as possible.
II. Processing route
From the process route, the machining of precision disc-shaped porous parts is not much different from other types of parts. The basic route is: rough machining→natural aging treatment→semi-finishing→natural aging treatment→finishing→finishing. Rough machining is to cut and mill the blank of the part, rough mill and drill the inner and outer surfaces, and both ends of the part, and rough boring the hole, and rough boring the outer groove of the part. Semi-finishing is used to semi-finish the surface of the inner and outer circles of the parts to meet the size requirements, and the two ends are semi-finished to meet the size requirements. The holes and the outer circular grooves are semi-finished boring. Finishing is the use of special fixtures and tools to fine boring the holes and external grooves of the parts. Rough turning of the inner and outer circles, and then rough milling of both ends to remove the margin, and lay the foundation for the next hole and groove finishing. The subsequent finishing process is essentially the use of special fixtures and tools for precision machining of the holes and external grooves.
For precision machining of parts, the setting of cutting parameters is very critical, which directly affects the machining accuracy. When setting the cutting amount, it is necessary to fully consider the surface quality requirements of the parts, the degree of tool wear, and the processing cost. Boring is a key process of this kind of part processing, and the setting of parameters is very important. In the process of rough boring the hole, a large amount of back-cutting is used and a low-speed cutting method is adopted. In the process of semi-precision boring and fine boring of holes, a small amount of back-grabbing should be used, and at the same time, attention should be paid to control the feed rate and adopt high-speed cutting methods to improve the processing quality of the part surface.
For the processing of precision disc-shaped porous parts, the processing of pores is not only the focus of processing, but also the difficulty of processing, which has a direct impact on the overall processing accuracy of the parts. To ensure the processing quality and accuracy of such parts, it is necessary to select a suitable machine tool, formulate a scientific process plan, use a special fixture for clamping, select a suitable tool for cutting, and appropriately control the cutting amount. The sample parts processed by this processing technology meet the requirements of the parts, which lays the foundation for the subsequent mass production and processing, and also provides reference and reference for the processing of similar parts.