Engine crankcase coarse positioning fixture and positioning method thereof

A crankcase and engine technology, which is applied in the field of manufacturing and processing of auto parts products, can solve problems such as shaking of the workpiece, poor process reference size, and affecting the processing quality of the crankcase, so as to achieve accurate and reliable positioning and meet the processing accuracy requirements.

Active Publication Date: 2015-06-03
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing rough positioning of the crankcase only uses the rough surface after casting for plane positioning, and does not use the cylinder bore for positioning. The positioning is relatively rough, and the workpiece may shake during the machining process, resulting in poor process reference dimensions and affecting Machining quality to the crankcase as a whole

Method used

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  • Engine crankcase coarse positioning fixture and positioning method thereof
  • Engine crankcase coarse positioning fixture and positioning method thereof
  • Engine crankcase coarse positioning fixture and positioning method thereof

Examples

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are only used to explain the present invention, and do not constitute a limitation to the protection scope of the present invention.

[0027] Such as Figure 1 to Figure 3 The rough positioning jig for the crankcase of the engine shown includes a frame 1 , a bottom plate 2 and three expansion pin assemblies 3 . The base plate 2 is mounted on the frame 1 so as to be movable up and down through a driving device 10, and the driving device 10 in this embodiment is a hydraulic cylinder. Clamping jaws 5 that can move up and down are respectively arranged on both sides of the frame 1 . A slide rail 6 and a positioning member are arranged on the bottom plate, and the positioning member includes a plurality of limit blocks 7 and flat-headed positioning pins 8 corresponding to the positions of the positioning holes on the top surface ...

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Abstract

The invention discloses an engine crankcase coarse positioning fixture and a positioning method thereof. The fixture comprises a frame, a bottom plate and a plurality of expansion pin components. The bottom plate is mounted on the frame in an up-down movable manner through a driving device. Sliding rails and positioning members are arranged on the bottom plate. The engine crankcase coarse positioning fixture and the positioning method have the advantages of capability of positioning a crankcase reliably so as to meet processing accuracy requirements of technological standards.

Description

technical field [0001] The invention belongs to the field of manufacturing and processing of auto parts products, and in particular relates to a rough positioning fixture and a positioning method for engine crankcase machining. Background technique [0002] Among the components that make up the engine, the crankcase plays a very important role as the skeleton. The crankcase is a typical box-type part, its structure is complex and special, and its precision is extremely high. The machining of the crankcase needs to be completed through multiple processes, and the entire process is extremely complicated. The general process is: process benchmark conversion-rough machining-finishing. Among them, using the rough surface of the crankcase for rough positioning and machining the process reference is called reference conversion. The selection of positioning and clamping schemes and precision requirements during the processing process benchmark will directly affect the quality of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q3/08
CPCB23Q3/082
Inventor 李红尚张建安任笑天陈骏
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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