Arc gear pump housing requires two holes high precision machining. In the medium and small batch production, the general use of general-purpose machine tools and special tooling to processing, this processing method is difficult to achieve accuracy requirements. Circular arc gear pump processing two holes of the process, a hole 12.5 for the 7, and the two holes limit the size of different; large hole R18.41 close to 8; coaxial, verticality, position tolerance requirements, in particular Position tolerance is very small. Therefore, the hole is difficult to process. As the arc gear pump housing hole processing of the second process is the key process, here only describes the process of fixture design. (1) fixture program and structure: Select the pump body G surface and two 9 diagonal holes for the positioning of the fixture with two pins on one side positioning. Linear indexing form. Clamp the part with two hook clamps. Figure 2 shows the structure of the fixture (Note: the figure shows only the key dimensions and the main part number). Clamp body 1 is an angle iron, with screws, tapered pins mounted on the carriage. Moving indexing block 2 and clamp body 1 through the dovetail guide rail, and with the bolt 3 lock. The indexing block 2 is provided with a cylindrical pin 4 and a chamfered pin 9 by which the part is positioned on the indexing block 2 and is pressed by the two hook- Seat 6 is used to support the rear end of the tool. With hand-drawn cylindrical indexing on the agency. For the convenience of operation, the workpiece is installed on the right side of the fixture, and the fixture body is provided with holes on the indexing block for the tool to enter the workpiece processing. In order to prevent the chips from entering the joining surfaces of the members 1 and 2, the chip holder 10 is fitted in the hole of the clip body 1. (2) Fixture features: The principle of benchmark coincidence, positioning error is small, higher indexing accuracy. Tool support at both ends, beating small, high precision machining hole size. Clamping reliable, easy to operate. The long-term use of proof, can fully guarantee the processing accuracy requirements, the downside is the process of observation is not convenient. (3) Fixture operation: Put the work piece into the two locating pins, tighten the hook-shaped platen nut and move the carriage longitudinally to insert the cylinder pin of the fixed mechanism 15 into the pin hole of the first hole. After machining the first hole, loosen the two lock nuts 3, pull out the cylinder pin of the alignment mechanism 15, move the index block 2 so that the cylinder pin of the alignment mechanism 15 is inserted into the second hole Pin hole, and tighten the nut 3, the processing of the second hole. (4) fixture installation requirements: manufacturing, the indexing agencies on the cylinder pin and bushing 12 with the preparation, with the gap of not more than 0.01mm. Installation, to ensure that the fixture center line K and spindle lathe coaxiality, coaxial tolerance of 0.015mm. P positioning and positioning of the lathe spindle axis perpendicular to the tolerance of 0.02mm. When the fixture is installed and adjusted, the horizontal feed must be locked, and the vertical feed should be set as dead stop iron.
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Fenghua Jade Motor Co., Ltd. , http://www.chinaseamlesssteelpipe.com