Assembly Technology of Blind Hole Tooling with High Precision Requirements

Abstract

The invention belongs to the field of mechanical processing, and relates to an assembly process of a blind hole tooling with high precision requirements, comprising the following steps: 1) processing the base to ensure the parallelism of both sides of the thickness of the base and the perpendicularity to the alignment reference plane; 2) processing the support plate, to ensure the parallelism of both sides of the thickness of the support plate and the perpendicularity to the bottom surface; 3) processing the support, to ensure the parallelism of both sides of the thickness of the support and the perpendicularity to the bottom surface; 4) processing the positioning plate; 5) processing the guide plate; 6) the base, The support and positioning plate are assembled into an integral structure and fixed on the worktable of the coordinate boring machine. The blind hole on the support is processed with a boring tool, the boring tool is raised axially, the support plate is assembled on the base, and the boring tool is replaced on the support plate. Process the through holes on the support plate; 7) assemble the guide plate on the support by adjusting the assembly method. The invention provides an assembly process for blind hole tooling with high precision requirements, which ensures assembly shape and position tolerance requirements, reduces dependence on workers' skill levels, and can greatly improve assembly pass rate.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and relates to an assembly process of a tool, in particular to an assembly process of a blind hole tool with high precision requirements. Background technique [0002] The structure of the EDM fixture is as follows figure 1 As shown, it includes a base 1 , a support plate 2 , a support 3 , a positioning plate 4 (the positioning plate 4 is provided with a plug 5 ) and a guide plate 6 , including a plurality of parts. Among them, the center line (reference C) of the through hole 7 of Ф44mm on the support plate 2 and the blind hole 8 of Ф30mm on the support 3 is to the installation surface (reference B) of the EDM fixture and the front surface (reference surface H, such as figure 2 The parallelism of shown) is not more than 0.01mm; the symmetry of the two grooves on the guide plate 6 to the reference C is not more than 0.01mm, and the perpendicularity to the reference B is not more than 0.01mm...

AI Technical Summary

Problems solved by technology

This method is very uneconomical and difficult to meet the assembly requirements. The reason is that after the processing of the parts is completed, the adjustment assembly method is required to assemble the parts together, and the adjustment assembly method can only be used for multiple high-precision shapes and positions at one time. One of the tolerance requirements is adjusted separately, which is too dependent on the assembly skill level of the workers, which is also one of the main reasons for the unqualified assembly

[0003] In actual production, coordinate boring equipment is used for the finishing of datum C. Although the method of assembly first and then machining can meet the shape and position accuracy of datum C, it will interfere with the support plate 2 during machining because the diameter of the main shaft is too large.

And if the boring tool passes through the support plate 2 Through hole 7 to process on support 3 Blind hole 8, the largest diameter of the shank can only be selected The length can only be processed with an extended tool bar (calculated, the length of the tool bar is not less than 330mm). Because the length-to-diameter ratio of the boring tool bar is too large, problems such as vibration and tool gap will inevitably occur during processing, which cannot meet the hole accuracy and surface roughness. requirements, and it is also easy to damage the boring tool

Therefore, the processing method is poor in manufacturability

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