A worm grinding machine tool rest shell processing device and processing method

Abstract

The worm wheel grinding machine tool rest shell machining device is used for grinding machining of a main shaft hole on a tool rest shell, and comprises a vertical grinder and a tool clamp for clamping and fixing the tool rest shell on the workbench of the vertical grinder. The tool clamp comprises a base, a clamping body for cooperating with the tool rest shell to be positioned and fixed, a positioning adjusting mechanism arranged on the clamping body and used for adjusting the position of the clamped tool rest shell, and an elastic support auxiliary mechanism arranged below the installation position of the tool rest shell and used for assisting the positioning and fixing between the tool rest shell and the clamping body. The tool rest shell is positioned and adjusted on the vertical grinder by using the tool clamp, the relative position between the main shaft hole and the main shaft of the vertical grinder can be adjusted in X and Y directions, the vertical grinder can be used for grinding machining of the main shaft hole on the tool rest shell, the coaxiality of the main shaft hole is ensured, the accuracy of the tool rest shell is ensured, and the service life of the bearing of the tool rest main shaft is prolonged.

Description

Technical Field

[0001] This invention relates to the field of vertical grinding technology, specifically to a processing device and method for the tool holder housing of a worm gear grinding machine. Background Technology

[0002] As a high-precision equipment for gear machining, the accuracy of the gear grinding machine directly affects the machine tool's overall precision, particularly the spindle mounting holes on the tool holder housing. Firstly, holes machined using existing methods often fail to meet the precision requirements of the drawings, leading to bearing damage after a period of operation and resulting in a loss of precision, necessitating bearing replacement. Secondly, the increased noise requirements of new energy vehicles significantly enhance the precision demands on gears, necessitating a corresponding increase in the precision of the gear grinding machine. The standard machining process for a tool holder housing is as follows: First, the part is rough-machined, leaving allowance for the guide rail surfaces and two sets of mounting holes. Then, the casting is aged to fully release stress. Next, a high-precision guide rail grinding machine grinds the two guide rail surfaces of the tool holder housing to the required dimensions. Using the guide rail surfaces as a reference, a high-precision coordinate boring machine is used to bore one set of mounting holes to the required dimensions. The spindle mounting holes of the tool holder housing have very high requirements: coaxiality of the holes at both ends ≤0.01, roundness ≤0.005, runout between the end face and the hole ≤0.005, and the distance tolerance between the hole center and the guide rail surface must be within 0.01mm. When machining holes on a coordinate boring machine, the guide rail surface has a tolerance of 30±0.01. Therefore, two pairs of equal-height shims with a height difference within 30±0.01 must first be used to level the guide rail surface of the tool holder housing. Then, the operator calibrates and straightens one side of the housing to ≤0.01. This positioning step must be repeated for each tool holder housing machined, requiring a very high level of operator skill. Afterward, the workpiece is clamped using a pressure plate. After boring begins, because the two holes involve the rotation of the boring machine's worktable, and the distance between the two holes and the boring machine spindle is different (one closer, one farther), the boring machine spindle itself cannot be perfectly horizontal relative to the worktable surface. The farther end amplifies this error, making it difficult to guarantee the coaxiality of the two holes, often resulting in out-of-tolerance phenomena. Due to the coaxiality error, the tool holder spindle increases the heat generated by the bearings during high-speed rotation, greatly shortening the bearing life. As a result, the gear grinding machine needs to replace the bearings after working far less than expected, reducing machine quality and increasing after-sales costs. Summary of the Invention

[0003] Technical Objective: To address the shortcomings of existing machining methods for tool holder housings in gear grinding machines, this invention discloses a machining device and method for tool holder housings of worm gear grinding machines that can effectively ensure the coaxiality of spindle hole machining and improve the service life of the gear grinding machine.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: A worm gear grinding machine tool holder housing processing device is provided for grinding the spindle hole on the tool holder housing. The processing device includes a vertical mill and a tooling fixture set on the vertical mill worktable for clamping and fixing the tool holder housing. The tooling fixture includes a base and a clamping body for positioning and fixing in conjunction with the tool holder housing. A positioning adjustment mechanism is provided on the clamping body for adjusting the position of the clamped tool holder housing. An elastic support auxiliary mechanism is provided below the tool holder housing installation position to assist in positioning and fixing the tool holder housing and the clamping body.

[0005] Preferably, the positioning adjustment mechanism of the present invention includes a first positioning adjustment component for positioning and fixing the relative position between the tool holder housing and the fixture body, and a second positioning adjustment component for positioning and fixing the position of the fixture body on the base. The first positioning component maintains the uniformity of the fixed positions of the tool holder housing and the fixture body, and the second positioning adjustment component makes the spindle hole to be machined concentric with the base. The first positioning adjustment component includes a positioning block disposed on the fixture body. The position of the positioning block is matched with the guide rail surface that has been machined on the tool holder housing to position the installation position of the tool holder housing. The fixture body is provided with workpiece adjustment blocks on both sides of the tool holder housing. Adjusting screws are screwed onto the workpiece adjustment blocks to fix the tool holder housing.

[0006] Preferably, the second positioning adjustment component of the present invention includes an adjustment block disposed on the outside of the clamp body, and a set screw disposed on the adjustment block, the end of the set screw abutting against the surface of the clamp body to adjust the position of the clamp body on the base.

[0007] Preferably, the bottom of the clamp body and the base of the present invention are locked together by screws. The clamp body has an adjustment hole that cooperates with the screw. When adjusting the position of the clamp body, it moves relative to the screw through the adjustment hole. After the adjustment is in place, the clamp body is locked onto the base with screws.

[0008] Preferably, the base of the present invention is provided with a counterweight at a position symmetrical to the clamping body to balance the centrifugal force generated by rotation, and the counterweight ensures smooth rotation during the machining of the spindle hole.

[0009] Preferably, the elastic support auxiliary mechanism of the present invention is provided with an elastic support block corresponding to the lower part of the tool holder housing. The elastic support block moves up and down relative to the base when subjected to force by a spring. When positioning the tool holder housing and the clamping body, the elastic support block provides an upward support force to balance the weight of the tool holder housing.

[0010] This invention also discloses a method for machining the tool holder housing of a worm gear grinding machine, using the above-mentioned machining apparatus, including the following steps: S01. Perform rough machining on the parts of the tool holder housing, leaving machining allowance for the guide rail surface and the opening of the tool holder housing; S02. Use a guideway grinding machine to finish the guideway surface of the tool holder housing. Use the finished guideway surface as a reference to finish the hole on the tool holder housing and leave a grinding allowance for the hole corresponding to the spindle hole. S03. Use the tooling fixture of the processing device to clamp and fix the tool holder housing, and adjust the position of the tooling fixture on the base to ensure the hole distance between the spindle hole and the guide rail surface. S04. Start the vertical mill to perform grinding of the spindle hole.

[0011] Preferably, in step S03 of the present invention, when positioning the tool holder housing using a tooling fixture, the position of the fixture is first adjusted according to the position of the fixture on the base and the center distance requirement between the spindle hole and the guide rail surface on the tool holder housing for initial positioning. After initial positioning, the position of the current spindle hole is within the range of the target machining spindle hole. Then, the vertical mill is started for trial grinding. After machining the round hole, the tool holder housing is removed, and the degree of eccentricity between the center position of the round hole and the center of the target spindle hole is detected. Based on the detection results, the position of the fixture is precisely adjusted, and then the tool holder housing is installed for grinding one end of the spindle hole. After the grinding is completed, the other end of the spindle hole is ground with the center of the machined spindle hole to ensure the coaxiality of the openings at both ends of the spindle hole.

[0012] Preferably, when the tool holder housing is fixed using a tooling fixture, the elastic support auxiliary mechanism on the base provides support force to the tool holder housing. The positioning surface of the positioning block on the fixture engages with the pre-machined guide rail surface on the tool holder housing, and the adjusting screw on the workpiece adjusting block is connected to the tool holder housing to complete the relative position positioning between the tool holder housing and the fixture. When the fixture is moved, the tool holder housing moves synchronously.

[0013] Beneficial effects: The worm gear grinding machine tool holder housing processing device and processing method disclosed in this invention have the following beneficial effects: 1. This invention utilizes tooling fixtures to adjust and position the tool holder housing on a vertical mill. It allows for adjustment of the relative position of the spindle hole and the vertical mill spindle in the X and Y directions, enabling the use of a vertical mill to grind the spindle hole on the tool holder housing. This ensures the coaxiality of the spindle hole, guarantees the accuracy of the tool holder housing, and extends the bearing life of the tool holder spindle.

[0014] 2. The present invention provides an elastic support auxiliary mechanism on the base, which can provide auxiliary support when installing and fixing the tool holder housing, avoid the tool holder housing from tilting, and reduce the difficulty of fixing the tool holder housing.

[0015] 3. The positioning adjustment mechanism of the present invention uses the first positioning adjustment component to fix the relative position of the tool holder housing and the clamping body, ensuring the uniformity of the tool holder housing position each time it is installed. This ensures that while adjusting the position of the clamping body using the second positioning adjustment component, the position of the spindle hole on the tool holder housing is adjusted synchronously, thereby improving the positioning accuracy.

[0016] 4. The present invention provides a counterweight on the base to ensure that the base rotates smoothly during the grinding of the spindle hole, thereby ensuring the machining accuracy of the spindle hole.

[0017] 5. When performing spindle hole grinding, the present invention first performs trial machining based on the initial positioning results, and then inspects the trial-machined round hole to confirm the deviation from the center of the required spindle hole. Thus, the positioning accuracy of the spindle hole can be guaranteed by adjusting the position of the fixture body a second time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a top view of the processing device of the present invention; Figure 2 This is a side sectional view of the processing apparatus of the present invention; Figure 3 This is a schematic diagram of the spindle hole structure processed according to the present invention; Among them, 1-tool holder housing, 2-spindle hole, 3-base, 4-clamp body, 5-elastic support auxiliary mechanism, 6-positioning block, 7-guide rail surface, 8-workpiece adjustment block, 9-adjusting screw, 10-adjusting block, 11-set screw, 12-counterweight block, 13-elastic support block, 14-spring. Detailed Implementation

[0020] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0021] like Figures 1-2 As shown, this invention discloses a processing device for the tool holder housing of a worm gear grinding machine, used for... Figure 3The grinding process of the spindle hole 2 on the tool holder housing 1 shown herein includes a vertical mill and a tooling fixture mounted on the vertical mill worktable for clamping and fixing the tool holder housing 1. The tooling fixture includes a base 3 and a clamping body 4 for positioning and fixing the tool holder housing 1. A positioning adjustment mechanism for adjusting the position of the clamped tool holder housing 1 is provided on the clamping body 4. An elastic support auxiliary mechanism 5 for assisting in positioning and fixing the tool holder housing 1 and the clamping body 4 is provided below the installation position of the tool holder housing 1. This invention utilizes the clamping body 4 to move the tool holder housing 1 on the base 3 for position adjustment, overcoming the shortcomings of existing vertical mill processing equipment that can only perform position adjustment in one direction and cannot guarantee the center distance requirements in two directions between the spindle hole 2 of the tool holder housing 1 and the corresponding guide rail surface. By using the vertical mill to grind the height of the spindle hole, the cylindricity and coaxiality of the spindle hole can be better guaranteed, and high-speed grinding can also ensure better surface roughness.

[0022] In a specific embodiment, the positioning adjustment mechanism of the present invention includes a first positioning adjustment component for positioning and fixing the relative position between the tool holder housing 1 and the fixture 4, and a second positioning adjustment component for positioning and fixing the position of the fixture 4 on the base 3. The first positioning component maintains the uniformity of the fixed positions of the tool holder housing 1 and the fixture 4, and the second positioning adjustment component makes the spindle hole to be machined concentric with the base 3. The first positioning adjustment component includes a positioning block 6 disposed on the fixture 4. The position of the positioning block 6 cooperates with the guide rail surface 7 that has been machined on the tool holder housing 1 to position the installation position of the tool holder housing 1. The fixture 4 is provided with workpiece adjustment blocks 8 on both sides of the tool holder housing 1. Adjusting screws 9 are screwed onto the workpiece adjustment blocks 8 to fix the tool holder housing 1.

[0023] The second positioning adjustment component of the present invention includes an adjustment block 10 disposed on the outside of the clamp body 4, and a set screw 11 disposed on the adjustment block 10. The end of the set screw 11 abuts against the surface of the clamp body 4 to adjust the position of the clamp body 4 on the base 3. The bottom of the clamp body 4 is locked and fixed to the base by screws. An adjustment hole is provided on the clamp body 4 to cooperate with the screw. When adjusting the position of the clamp body 4, it moves relative to the screw through the adjustment hole. After the adjustment is in place, the clamp body 4 is locked to the base 3 by screws.

[0024] When assembling and adjusting the tool holder housing 1, it is necessary to ensure that the axial direction of the spindle hole is consistent with the machining axis of the vertical mill. Therefore, there should be no deviation in the axial direction. This invention uses an elastic support auxiliary mechanism to balance the weight of the tool holder housing 1, so that the position of the tool holder housing can be easily adjusted when fixing the tool holder housing. The elastic support auxiliary mechanism 5 of this invention is provided with an elastic support block 13 corresponding to the lower part of the tool holder housing. The elastic support block 13 moves up and down relative to the base 3 when subjected to force by a spring 14. When positioning the tool holder housing 1 and the fixture 4, the elastic support block 13 provides an upward support force to balance the self-weight of the tool holder housing 1, thereby reducing the difficulty of installing and positioning the tool holder housing and quickly achieving installation and fixing. On the base 3 of this invention, a counterweight block 12 is provided symmetrically with respect to the fixture 4 to balance the centrifugal force generated by rotation. The counterweight block 12 ensures smooth rotation during the machining of the spindle hole 2 and ensures the final machining quality of the spindle hole.

[0025] This invention also discloses a method for machining the tool holder housing of a worm gear grinding machine, using the aforementioned machining apparatus to machine the spindle hole, such as... Figure 3 As shown, the spindle hole of the tool holder housing consists of several holes of different diameters along the axial direction. It is precisely because the diameter of the middle region is smaller than that of the two ends that machining of the two ends is required.

[0026] The processing method of the present invention includes the following steps: S01. Perform rough machining on the parts of the tool holder housing, leaving machining allowance for the guide rail surface and the opening of the tool holder housing; S02. Use a guideway grinding machine to finish the guideway surface of the tool holder housing. Use the finished guideway surface as a reference to finish the hole on the tool holder housing and leave a grinding allowance for the hole corresponding to the spindle hole. S03. Use the tooling fixture of the processing device to clamp and fix the tool holder housing, and adjust the position of the tooling fixture on the base to ensure the hole distance between the spindle hole and the guide rail surface. When using a tooling fixture to position the tool holder housing, the elastic support auxiliary mechanism on the base provides support for the tool holder housing. The positioning surface of the positioning block on the fixture engages with the pre-machined guide rail surface on the tool holder housing, and the adjusting screw on the workpiece adjusting block is connected to the tool holder housing to complete the relative position positioning between the tool holder housing and the fixture. When the fixture moves, the tool holder housing moves synchronously.

[0027] First, adjust the position of the fixture based on its position on the base and the required center distance between the spindle hole and the guide rail surface on the tool holder housing. After initial positioning, the current position of the spindle hole is within the range of the target spindle hole. Then, start the vertical mill for trial grinding. After machining the round hole, remove the tool holder housing and check the degree of eccentricity between the center position of the round hole and the center of the target spindle hole. Based on the test results, reinstall the tool holder housing and precisely adjust the position of the fixture on the base to ensure that the center distance between the spindle hole and the guide rail surface machined by the vertical mill meets the requirements.

[0028] S04. Start the vertical mill to perform the grinding of the spindle hole. During the grinding of the spindle hole, the disk of the vertical mill clamps the base, controlling the runout of the outer circle of the base within 0.005mm, and keeping the center distance between the base and the disk in compliance with requirements. The disk drives the base to rotate synchronously to perform the grinding of the spindle hole. After the hole diameter structure at the corresponding end is machined, the tool fixture is removed, the tool holder housing is adjusted, and the spindle hole on the tool holder housing is aligned and positioned according to the part of the spindle hole that has been ground. The other end of the spindle hole is then ground to ensure that the coaxiality of the holes at both ends of the spindle hole meets the requirements and to extend the life of the spindle bearing of the tool holder of the gear grinding machine.

Claims

1. A method for machining the tool holder housing of a worm gear grinding machine, characterized in that, The grinding of the spindle hole (2) on the tool holder housing (1) is performed using a machining device. The machining device includes a vertical mill and a tooling fixture set on the vertical mill worktable for clamping and fixing the tool holder housing (1). The tooling fixture includes a base (3) and a fixture body (4) for positioning and fixing in cooperation with the tool holder housing (1). A positioning adjustment mechanism for adjusting the position of the clamped tool holder housing (1) is provided on the fixture body (4). An elastic support auxiliary mechanism (5) for assisting the positioning and fixing between the tool holder housing (1) and the fixture body (4) is provided below the installation position of the tool holder housing (1). The processing method includes the following steps: S01. Perform rough machining on the parts of the tool holder housing, leaving machining allowance for the guide rail surface and the opening of the tool holder housing; S02. Use a guideway grinding machine to finish the guideway surface of the tool holder housing. Use the finished guideway surface as a reference to finish the hole on the tool holder housing and leave a grinding allowance for the hole corresponding to the spindle hole. S03. Use the tooling fixture of the processing device to clamp and fix the tool holder housing, and adjust the position of the tooling fixture on the base to ensure the hole distance between the spindle hole and the guide rail surface. S04. Start the vertical mill to perform grinding of the spindle hole; In step S03, when positioning the tool holder housing using a tooling fixture, the position of the fixture is first adjusted according to the position of the fixture on the base and the center distance requirement between the spindle hole and the guide rail surface on the tool holder housing for initial positioning. After initial positioning, the position of the current spindle hole is within the range of the target spindle hole. Then, the vertical mill is started for trial grinding. After the round hole is machined, the tool holder housing is removed, and the degree of eccentricity between the center position of the round hole and the center of the target spindle hole is detected. Based on the detection results, the position of the fixture is precisely adjusted, and then the tool holder housing is installed for grinding one end of the spindle hole. After the machining is completed, the other end of the spindle hole is ground with the center of the machined spindle hole to ensure the coaxiality of the openings at both ends of the spindle hole.

2. The method for machining the tool holder housing of a worm gear grinding machine according to claim 1, characterized in that, When using a tooling fixture to fix the tool holder housing, the elastic support auxiliary mechanism on the base provides support force to the tool holder housing. The positioning surface of the positioning block on the fixture body cooperates with the pre-machined guide rail surface on the tool holder housing. Then, the adjusting screw on the workpiece adjusting block is connected to the tool holder housing to complete the relative position positioning between the tool holder housing and the fixture body. When the fixture body moves, the tool holder housing moves synchronously.

3. The method for machining the tool holder housing of a worm gear grinding machine according to claim 1, characterized in that, The positioning adjustment mechanism includes a first positioning adjustment component for positioning and fixing the relative position between the tool holder housing (1) and the fixture body (4) and a second positioning adjustment component for positioning and fixing the position of the fixture body (4) on the base (3). The first positioning component keeps the positions of the tool holder housing (1) and the fixture body (4) uniform after fixing, and the second positioning adjustment component makes the spindle hole to be processed concentric with the base (3). The first positioning adjustment component includes a positioning block (6) set on the fixture body (4). The position of the positioning block (6) is matched with the guide rail surface (7) that has been processed on the tool holder housing (1) to position the installation position of the tool holder housing (1). The fixture body (4) is provided with workpiece adjustment blocks (8) on both sides of the tool holder housing (1). Adjusting screws (9) are screwed on the workpiece adjustment blocks (8) to fix the tool holder housing (1).

4. A method for machining the tool holder housing of a worm gear grinding machine according to claim 3, characterized in that, The second positioning adjustment component includes an adjustment block (10) disposed on the outside of the clamp body (4), and a set screw (11) is disposed on the adjustment block (10). The end of the set screw (11) abuts against the surface of the clamp body (4) to adjust the position of the clamp body (4) on the base (3).

5. A method for machining the tool holder housing of a worm gear grinding machine according to claim 4, characterized in that, The bottom of the clamping body (4) is locked and fixed to the base by screws. An adjustment hole is provided on the clamping body (4) to cooperate with the screw. When adjusting the position of the clamping body (4), it is moved relative to the screw through the adjustment hole. After the adjustment is in place, the clamping body (4) is locked to the base (3) by screws.

6. The method for machining the tool holder housing of a worm gear grinding machine according to claim 1, characterized in that, On the base (3), a counterweight (12) is set at a position symmetrical to the clamping body (4) to balance the centrifugal force generated by rotation. The counterweight (12) ensures that the rotation of the spindle hole (2) is stable during machining.

7. A method for machining the tool holder housing of a worm gear grinding machine according to claim 1, characterized in that, The elastic support auxiliary mechanism (5) is provided with an elastic support block (13) corresponding to the lower part of the tool holder housing. The elastic support block (13) moves up and down relative to the base (3) when subjected to force by a spring (14). When positioning the tool holder housing (1) and the clamping body (4), the elastic support block (13) provides an upward support force to balance the weight of the tool holder housing (1).

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