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High-temperature 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. Internship factory production of this part, from the processing methods, tools, fixtures continue to improve, a better solution to this problem, the processing quality is stable and reliable. 1, the pump hole accuracy requirements and processing methods After repeated testing, improvement, now using the following processing methods: the two holes on the two ends of processing, 4-9 holes after the processing steps, and 4-9 in a diagonal hole Accuracy increased to 9H8, for positioning. Then use three processes to process the holes of R18.41 and 12.5. The first process: lathe with indexing rotary fixture car R18.41 hole to R18.31 +0.065 +0.035 (R18.41 with casting bottom hole), drilling 12.5 hole to 11.5, and then boring to 12.4 ± 0.01. The second process: the design of special composite reamers, lathe (due to drilling spindle rotation accuracy is low, can not use drilling machine) while reaming R18.41 and 12.5 coaxial hole. Big hole hinge to R18.41 + 0.055 + 0.025, two small holes hinge to 12.5S7 size. The tool is mounted on the spindle (remove the chuck) and the tail end of the tool is provided with guide bearings on the clamp. Fixture mounted on the carriage (remove the knife holder), with a straight line indexing fixture. The third process: Drill with a floating reamer to one of the holes to 12.5F7 size requirements. 2, fixture design Hole processing as the second process is the key process, where only the fixture design introduced this process. (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. 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 operation: Put the work piece into the two locating pins, tighten the hook-shaped platen nut and move the carriage longitudinally to insert the 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. (3) fixture installation requirements: manufacturing, the indexing agencies for 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. (4) Fixture features: The principle of reference 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.
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