One-time installation of multi-hole turning jig (5)
Because ΔB=0, the positioning error is ΔD=Δy=0.065 mm/100 mm; while the pattern requires a radius of 22.5mm, the coordinate tolerance of the hole is ±0.06mm. Therefore, the influence of the corner error on the machining accuracy of the workpiece is in the pattern. Within the allowable range.
(3) Design and processing of the weight (the weight is shown in Figure 8) Design guiding idea: According to the specific situation, the shape and placement position of the weight are determined, and finally the thickness of the weight is calculated.
Figure 8 weights
1 material selected HT200 cast iron.
2 size setting is based on specific calculations, the calculation process is as follows:
a. Balance analysis. Before the weight is added, the resultant force of the centrifugal inertia force is not zero due to the difference between the positioning plate and the fixed plate. Therefore, in order to balance it, it is necessary to add a balance mass to the rotating body so that the combined force of the centrifugal inertial force generated by the centrifugal inertia force generated by the original mass is equal to zero.
b. First, find the total centrifugal inertia force (ie, eccentric moment) of the positioning plate and the part.
The thickness of the final weight is 23 mm (the weight is shown in Figure 8).
5 Conclusion
Through production practice, the fixture is used to perform boring of the valve body on the horizontal lathe. The geometry, shape and surface roughness of the hole system meet the design requirements of the pattern, and the processing efficiency is compared with the ordinary boring machine or The horizontal lathe is increased by 10 to 12 times by the conventional method, and the hole diameter and the center distance are easy to control. Therefore, the valve body processing quality is good, and the product use requirements are satisfied. The horizontal lathe boring fixture has the following advantages: 1 high positioning accuracy. 2 indexing is convenient and fast. 3The clamping is reliable and the rigidity is good. 4 The fixture has a simple structure and is easy to manufacture. 5 Improve processing efficiency and reduce product cost.
For more articles, please refer to "Metal Processing" Cold Processing 2008 No. 1
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