Fixture for completing grinding of inner hole and end face of thin-wall gear through one-time clamping

Abstract

The utility model relates to a clamp for completing grinding of an inner hole and an end face of a thin-wall gear through one-time clamping, and belongs to the technical field of machine tool fixtures. According to the structure, a positioning disc is a hollow cylinder, and a through hole of the positioning disc is in clearance fit with an assembled gear; a limiting table is arranged at one end of the positioning disc; the inner end surface of the limiting table is in contact with the inner end surface of the gear for limiting; three pressing plates are evenly distributed on the circumference of the other end of the positioning disc, one end of each pressing plate is connected with the positioning disc, and the other end of each pressing plate is pressed on the tooth end face of the gear. After the clamp is used for clamping a part, the part is prevented from interfering with a grinding wheel in the grinding process, grinding of the inner hole and the end face of the thin-wall gear is completed through one-time clamping, and the machining precision of the inner hole is improved.

Description

Technical Field

[0001] This utility model relates to a fixture for grinding the inner hole and end face of a thin-walled gear in one clamping operation, belonging to the technical field of machine tool fixtures. Background Technology

[0002] Our company undertakes the machining of various gears, among which thin-walled gears suffer from insufficient radial rigidity due to their design. If the traditional clamping method of just clamping the outer diameter of the gear is used, it is highly susceptible to gear deformation. If the inner hole is ground while deformed, the inner hole will spring back after the gear is released, making it impossible to guarantee the roundness of the inner hole. Since the inner hole of the gear is the positioning hole for the final grinding process, substandard positioning hole accuracy will lead to substandard overall gear accuracy after grinding. By changing the clamping method, we significantly improve the roundness of the inner hole and the perpendicularity of the inner hole end face of thin-walled gears, providing a high-precision positioning reference for the final grinding process, directly ensuring the grinding accuracy of the gear and the subsequent assembly accuracy. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a fixture for grinding the inner hole and end face of a thin-walled gear in one clamping. After clamping the part, the fixture prevents the part from interfering with the grinding wheel during the grinding process, thus realizing the grinding of the inner hole and end face of the thin-walled gear in one clamping and improving the machining accuracy of the inner hole.

[0004] To solve the above problems, the specific technical solution of this utility model is as follows: a fixture for grinding the inner hole and end face of a thin-walled gear in one clamping operation; the positioning plate is a hollow cylinder, and the through hole of the positioning plate is clearance-fitted with the gear being assembled; a limiting platform is provided at one end of the positioning plate, and the inner end face of the limiting platform contacts and limits the inner end face of the gear; three pressure plates are evenly distributed around the other end of the positioning plate, one end of the pressure plate is connected to the positioning plate, and the other end is pressed against the tooth end face of the gear.

[0005] The pressure plate is provided with a long countersunk hole, the length direction of which is consistent with the radial direction of the positioning plate; a clamping screw is provided in the long countersunk hole, and the clamping screw passes through the pressure plate and connects to the positioning plate.

[0006] The contact surface between the pressure plate and the gear is provided with a limiting groove, and the outer circle of the gear teeth contacts and limits the contact with the limiting groove.

[0007] The outer circumference of the positioning disk is connected to the three-jaw chuck of the internal grinding machine.

[0008] The fixture described in this application, which completes the grinding of the inner bore and end face of a thin-walled gear in a single clamping operation, has the following advantages:

[0009] 1. This application adopts the principle of changing the clamping method to solve the problem that the traditional clamping of the outer circle of the gear can easily cause the thin-walled gear to deform and thus cannot guarantee the grinding accuracy (roundness) of the inner hole;

[0010] 2. The present application concludes that the size of the pressure plate can be changed according to the size of the thin-walled gear to meet the grinding needs of thin-walled gears of different sizes;

[0011] 3. The structure of this application adopts a clamping method that clamps the end face of the gear, which can avoid interference with the grinding wheel when grinding the inner hole and end face of the gear. It can complete the grinding of the inner hole and end face of the thin-walled gear in one go, greatly improving the perpendicularity of the inner hole and end face. It can be widely used in internal grinding machines for thin-walled gear processing. Attached Figure Description

[0012] Figure 1 This is a perspective view of this application.

[0013] Figure 2 This is a three-dimensional view of the application status of this application. Detailed Implementation

[0014] like Figure 1 and Figure 2 As shown, the fixture completes the grinding of the inner hole and end face of the thin-walled gear in one clamping. The positioning plate 1 is a hollow cylinder. The through hole of the positioning plate 1 is clearance-fitted with the assembled gear 6. The outer circumference of the positioning plate 1 is connected to the three-jaw chuck 5 of the internal grinding machine. A limiting platform 4 is provided at one end of the positioning plate 1. The inner end face of the limiting platform 4 contacts and limits the inner end face of the gear 6. Three pressure plates 2 are evenly distributed around the other end of the positioning plate 1. One end of the pressure plate 2 is connected to the positioning plate 1, and the other end is pressed against the tooth end face of the gear 6.

[0015] The pressure plate 2 is provided with a long countersunk hole, the length direction of which is consistent with the radial direction of the positioning plate; a clamping screw 3 is provided in the long countersunk hole, and the clamping screw 3 passes through the pressure plate 2 and is connected to the positioning plate 1.

[0016] The contact surface between the pressure plate 2 and the gear 6 is provided with a limiting groove 7, and the outer circle of the tooth of the gear 6 contacts and limits the contact with the limiting groove 7.

[0017] The structural installation and alignment method of this application:

[0018] 1. Place the positioning disk 1 on the three-jaw chuck 5 of the internal grinding machine and make it close to the positioning surface of the jaw. Adjust the runout tolerance of the positioning concave circle 4 end face of the positioning disk 1 using a dial indicator. After meeting the process requirements, lock the jaw to fix the positioning disk 1 on the three-jaw chuck 5 of the internal grinding machine.

[0019] 2. Install the gear into the positioning concave circle 4, pre-tighten the end face of the gear with the pressure plate 2 and the clamping screw 3, use a dial indicator to find the machining reference of the gear 6, and tighten the clamping screw 3 after the process requirements are met to press the gear 6 tight.

[0020] 3. Grind the inner hole and end face of gear 6. After the grinding is completed, loosen the clamping screw 3 and the pressure plate 2, remove gear 6, and the grinding is completed.

[0021] This utility model utilizes the principle of changing the clamping method to realize the design concept, providing an effective means to ensure the machining accuracy of the inner hole of thin-walled gears. It is particularly suitable for the production and processing of various thin-walled gears. Therefore, it has unique advantages in ensuring the machining accuracy of the inner hole of thin-walled gears (which is also the positioning hole for the final grinding sequence of thin-walled gears) and can be widely applied in the field of preventing deformation in the grinding of the inner hole of thin-walled gears.

Claims

1. A fixture for grinding the inner hole and end face of a thin-walled gear in a single clamping operation, characterized in that: The positioning plate (1) is a hollow cylinder. The through hole of the positioning plate (1) is clearance-fitted with the assembled gear (6). A limiting platform (4) is provided at one end of the positioning plate (1). The inner end face of the limiting platform (4) contacts and limits the inner end face of the gear (6). Three pressure plates (2) are evenly distributed around the other end of the positioning plate (1). One end of the pressure plate (2) is connected to the positioning plate (1), and the other end is pressed against the tooth end face of the gear (6).

2. The fixture for clamping and grinding the inner hole and end face of a thin-walled gear according to claim 1, characterized in that: The pressure plate (2) is provided with a long countersunk hole, the length direction of which is consistent with the radial direction of the positioning plate; a clamping screw (3) is provided in the long countersunk hole, and the clamping screw (3) passes through the pressure plate (2) and connects to the positioning plate (1).

3. The fixture for clamping and grinding the inner hole and end face of a thin-walled gear according to claim 2, characterized in that: The contact surface between the pressure plate (2) and the gear (6) is provided with a limiting groove (7), and the outer circle of the tooth of the gear (6) contacts and limits the contact with the limiting groove (7).

4. The fixture for clamping and grinding the inner hole and end face of a thin-walled gear according to claim 1, characterized in that: The outer circumference of the positioning disk (1) is connected to the three-jaw chuck (5) of the internal grinding machine.

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