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3 The device can be used for other products similar to the eccentric gear chamber fixture of the truck. Liu Yuzhen (Technology Department of Shanshan Xiaxia Hydraulic Parts Factory) in the machining of the oil pump, the center distance of the two gear chambers of the pump body and the gear chamber The verticality of the bottom surface and the end surface is very important, which directly affects the performance of the oil pump. To ensure the dimensional accuracy and geometric accuracy requirements, it must be processed in a single clamping manner.
In the past, we have designed several kinds of fixtures according to this principle, but these fixtures are complicated in structure, troublesome to install and debug, and due to the eccentric structure of the pump body, the centrifugal force generated during the machining process is relatively large, which not only cannot guarantee the machining accuracy of the workpiece, but also Causes varying degrees of damage to the machine.
Under the premise of ensuring the machining accuracy of the workpiece without damaging the machine tool, we have long-term exploration and repeated practice, based on the mathematical principle of determining the circle of three points not on the same line, designed a 360-rotary fixture to process this kind of circle. The eccentric chamber of the pump body part. The design of the fixture is novel and reasonable, and the processing difficulties of the process are solved after being put into use.
The structural principle is as shown in the following figure: the weight body packing rotating shaft small bushing positioning pin rotary shaft large bushing bolt small pressing plate large pressure plate coincide; b point is the rotating center of the fixture, that is, the actual workpiece center, it and the fixture The centers of the rotary shafts 6 coincide. The rotating body 3 is freely rotatable about the rotary shaft 6, so as to align the precise position of the workpiece to be processed; the bolt 8 positions the rotating body at a predetermined workpiece processing position, and then presses the rotating body 3 by the small pressing plate 9, the workpiece is pressed by the large pressing plate 10 is fixed to the rotating body 3. According to the position state in the figure, first machine a gear chamber a (the point a is at the center of the machine tool rotation) so that ab=21. 88.+°°25, however, pull out the bolt 8, loosen the small pressure plate 9, and dial with the bolt 8. The rotating body 3 is rotated 180% around the rotary shaft 6 and then the bolt 8 is inserted into the positioning sleeve at this position. At this time, the other gear chamber c coincides with the center of the machine tool, the small pressure plate 9 is pressed, and the gear chamber is turned to make bc= 21.8S+m, so that the center distance of the two gear chambers is ac =43.76.+°' During the machining process, the weight body 1 can eliminate the centrifugal force generated by the center of gravity of the workpiece and the center of rotation of the machine tool. It is fixed by the countersunk head screw. On the root 2, the packing 2 is fastened to the machine root.
2 Fixture process precision adjustment Due to the processing and measurement of fixture parts and the installation of fixtures and workpieces, a series of cumulative errors are caused to the machining of the workpiece. The fixture can adjust the gap by itself to eliminate the error. Because the rotary shaft 6 and the large bushing 7, the rotating body 3 and the weight body 1, the pin 8 and the small bushing 4 are gap-fitted, the self-weight of the rotating body can change their clearance fit state, so that the rotating body is in the vertical direction. It is in a different position.
The adjustment of the gap allows fine adjustment of the center distance of the workpiece. 8mm. According to the position of the illustrated position, if the center distance of the gear chamber is too large, the small pressure plate 9 can be loosened, and the machine tool spindle 180 is rotated so that the c point is above the b point of the center of the jig rotation. At this time, due to the gravity of the rotating body itself The function is to make the center of the workpiece move downward with the center b of the clamp, and the center of the turning of the lathe, that is, the center point of the gear chamber is not changed, and the small pressing plate 9 is pressed for turning, which can reduce the ab by 0004 mm; turning another gear The chamber can reduce the center distance of the workpiece by 00. 8mm. If the center distance of the workpiece is small, the small pressure plate 9 can be loosened, and the rotary lathe main shaft 180% can increase the center distance of the workpiece by 00.08mm. This shows that this unique The design method makes the fixture have the following advantages: 1 The structure is simple, the clamping is convenient and labor-saving, and the two clamping processes can complete two processes.
2 The weight device is simple and reasonable, eliminates centrifugal force during turning and protects the lathe.
3 The accuracy of the workpiece can be guaranteed by the adjustment of the gravity of the fixture itself.
3 Promotion and application of the fixture This design scheme is not only suitable for the two-point hole machining of the double gear chamber structure, but also for the machining of the cavity of the rotor pump body with eccentric structure and the 3 holes not in the same straight line. Turning of parts.
The application of such fixtures not only ensures the machining accuracy of the workpiece, but also prolongs the service life of the machine tool, and greatly improves the production efficiency.
Conference Information The China National Internal Combustion Engine Industry Association's 2000-Cylinder and Piston Ring Branch Annual Meeting 2000 and Technology Exchange Conference will be held in Nanjing from November 23 to 26, 2000.
The content of the meeting: summarizing and sharing the issues of common concern in the two industries, and how to adapt to the needs of the current development situation (reconstruction and countermeasures after joining the WTO); introducing the scientific research and technological innovations (including new materials) obtained by various manufacturers in the two industries over the past year. , new technology, new equipment, etc.); special equipment for processing piston ring cylinder liners and summary of association work.
The meeting welcomed: the leaders, scholars, experts and engineering technicians of the manufacturers and research institutes involved in this conference participated.
Contact Unit: Nanjing Dahengguangda Technology Co., Ltd. (No. 57, Shipenxiang, Nanjing) China Internal Combustion Engine Industry Association Cylinder Liner Piston Ring Branch
Hydraulic Retarder,Truck Hydraulic Retarder,Truck Braking Retarder,Heave Truck Hydraulic Retarder
Fuxin Dare Automotive Parts Co., Ltd. (DARE AUTO) , https://www.darepump.com