Pump Housing
Challenge
A metering pump is a type of fluid conveying machinery, and its outstanding feature is that it can maintain a constant flow rate that is independent of the discharge pressure. The use of a metering pump can simultaneously complete the functions of conveying, metering and regulation, thereby simplifying the production process. Using multiple metering pumps, several media can be input into the process flow in an accurate proportion for mixing.
Processing difficulties: control valve hole and plunger hole, hole diameter φ19H7, depth 230 (12 times the diameter), hole diameter φ19.5H7, depth 180 (9 times the diameter), roundness 0.01, straightness 0.015, roughness Ra0.8, and the hole shape and position tolerance requirements for the worm gear installed in the inner cavity are very high. “
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Analysis
Multi-faceted and multi-process processing, multiple clamping, and secondary clamping errors have a great influence on the related dimensional behavior tolerance requirements; the aperture is relatively small, the precision is high, the depth is very deep, and the roughness requirements are very high. Conventional tools cannot meet the customer’s drawing design requirements.
Solution
Analyze the fixture design plan, improve the repeated clamping positioning accuracy of the fixture, reduce multi-sequence processing, and affect the dimensional behavior tolerance due to clamping reasons; for the accuracy and roughness of deep holes, design special tools according to the equipment working conditions to meet the accuracy requirements of customer drawing designs.
Results
We independently designed and manufactured the fixture, and after many adjustment experiments, we effectively solved the impact of secondary clamping errors on dimensional tolerances. We designed special deep-hole tools, and the dimensional accuracy produced by them far exceeded the customer’s design requirements.
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