Special-shaped expansion block molded surface numerical control milling fixture and machining method

Abstract

The invention discloses a special-shaped expansion block molded surface numerical control milling fixture and a machining method. The fixture comprises a bottom plate, a right support, a right pressing plate, a left pressing plate and a left support. The right pressing plate is mounted on the bottom plate through a right screw rod. The right support is mounted between the bottom plate and the right pressing plate and located on the right side of the right screw rod. The left pressing plate is mounted on the bottom plate through a left screw rod. The left support is mounted between the bottom plate and the left pressing plate and located on the left side of the left screw rod. A locating block is arranged on the inner side of the right pressing plate. The machining method comprises the steps of (1) design and manufacturing of the fixture; (2) alignment of the fixture; (3) clamping of an expansion block; (4) establishing of an expansion block digital model; and (5) machining of expansionblock molded surfaces. The special-shaped expansion block molded surface numerical control milling fixture is simple in structure and low in manufacturing difficulty. The fixture is used for conducting numerical control machining, parts are convenient to dismantle, the interchangeability is good; the machining consistency of the expansion block part molded surfaces can be effectively ensured, andmeanwhile, the labor intensity of workers is reduced.

Description

Technical field [0001] The invention belongs to the technical field of mechanical processing, and specifically relates to a fixture and a processing method for numerical control milling processing of a profiled expansion block surface. Background technique [0002] At present, the forming method of engine heat shield type parts is combined welding after segment pressing or welding after roll forming. However, the roundness and dimensional accuracy of parts using the above forming method are not easy to guarantee. [0003] Based on the above-mentioned two molding methods, the roundness and dimensional accuracy of parts are not easy to guarantee, and it is necessary to use the bulging process method to correct the shape and dimensional accuracy of engine heat shield parts to meet the assembly requirements. The bulging mold expansion blocks are usually special-shaped parts, and the processing of such expansion block parts generally adopts the following methods: [0004] (1) The five-ax...

AI Technical Summary

Problems solved by technology

[0004] (1) The five-axis machining center is used to process the profile of the expanding block. The processing cost of this processing method is high, which greatly increases the processing cost of parts;

[0005] (2) The three-axis machining center is used to process the profile of the expanding block, and the processing cost and labor intensity of the workers are greatly reduced under the condition of ensuring the machining accuracy, but the four-in-one requirements for positioning, clamping, alignment, and tool setting higher

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