Worm grinding wheel gear grinding machine tool rest shell machining device and machining method

Abstract

The invention discloses a worm grinding wheel gear grinding machine tool rest shell machining device which is used for grinding a main shaft hole in a tool rest shell and comprises a vertical mill and a tool clamp arranged on a vertical mill workbench and used for clamping and fixing the tool rest shell. The tool clamp comprises a base and a clamp body used for being matched with the tool rest shell for positioning and fixing, and a positioning and adjusting mechanism used for adjusting the position of the clamped tool rest shell is arranged on the clamp body. An elastic supporting auxiliary mechanism used for assisting positioning and fixing between the tool rest shell and the clamp body is arranged below the installation position of the tool rest shell. The tool clamp is used for adjusting and positioning the machining position of the tool rest shell on the vertical mill, the relative position of the main shaft hole and the main shaft of the vertical mill can be adjusted in the X direction and the Y direction, the vertical mill can be used for grinding the main shaft hole in the tool rest shell, the coaxiality of the main shaft hole is guaranteed, and the precision of the tool rest shell is guaranteed; and the bearing life of the knife rest spindle is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of vertical grinding, and in particular to a device and a method for processing a tool holder shell of a worm grinding wheel gear grinding machine. Background Art

[0002] The accuracy of the tool holder of a gear grinder directly affects the accuracy of the machine tool, and the spindle mounting hole on the tool holder housing is of utmost importance. On the one hand, the holes processed by the existing method cannot meet the accuracy requirements of the drawings. After a period of operation, the machine tool will experience bearing damage, resulting in loss of accuracy and the need to replace new bearings. On the other hand, due to the increased noise requirements of new energy vehicles, the accuracy requirements for gears have also been greatly increased, so the accuracy of the gear grinder must also be improved accordingly. The conventional tool holder housing processing process is as follows: first, the parts are rough-machined, and the guide surface and two sets of mounting holes are left with allowances. The castings are aged to fully release the stress of the parts. Then, the two guide surfaces of the tool holder body are ground to size using a high-precision guide grinder. Based on the guide surface, a set of mounting holes are bored to size using a high-precision coordinate boring machine. The spindle mounting holes of the tool holder housing have very high requirements. The coaxiality of the holes at both ends is ≤0.01, the roundness is ≤0.005, the runout between the end face and the hole is ≤0.005, and the distance tolerance between the center of the hole and the guide surface is required to be within 0.01mm. When machining holes on the coordinate boring machine, the guide surface has a tolerance of 30±0.01. Therefore, two pairs of equal-height pads with a height difference of less than 30±0.01 should be used to level the guide surface of the tool holder housing. Then the operator should calibrate and straighten one side of the housing to ≤0.01. This positioning step should be repeated for each tool holder housing, which requires extremely high skill levels of the operator. Then the workpiece is pressed by the pressure plate. After boring begins, since the two holes involve the rotation of the boring machine table, and the distance between the two holes and the boring machine spindle is one close and one far, the boring machine spindle itself cannot be completely horizontal relative to the worktable, and the farther end further magnifies this error, making it difficult to ensure the coaxiality of the two holes, and often out of tolerance. Due to the coaxiality error, the tool holder spindle increases the heat of the bearing when rotating at high speed, which greatly shortens the bearing life, so that the gear grinder needs to replace the bearing after a working time far less than expected, which reduces the quality of the machine tool and increases the after-sales cost. Summary of the invention

[0003] Technical purpose: In view of the deficiencies in the processing of the tool holder shell of the above-mentioned existing gear grinding machine, the present invention discloses a worm wheel gear grinding machine tool holder shell processing device and processing method, which can effectively ensure the coaxiality of the spindle hole processing 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 tool holder housing processing device for a worm wheel gear grinding machine is used for grinding a spindle hole on a tool holder housing. The processing device includes a vertical mill and a tool fixture arranged on a vertical mill workbench for clamping and fixing the tool holder housing. The tool fixture includes a base and a clamping base for cooperating with the tool holder housing for positioning and fixing. A positioning adjustment mechanism for adjusting the position of the clamped tool holder housing is arranged on the clamping base. An elastic support auxiliary mechanism for assisting the positioning and fixing between the tool holder housing and the clamping base is arranged below the installation position of the tool holder housing.

[0005] Preferably, the positioning and adjustment mechanism of the present invention includes a first positioning and adjustment component for positioning and fixing the relative position between the tool holder housing and the clamping base, and a second positioning and adjustment component for positioning and fixing the position of the clamping base on the base. The first positioning component is used to maintain the uniform position of the tool holder housing and the clamping base after they are fixed, and the second positioning and adjustment component is used to make the spindle hole to be processed concentric with the base; the first positioning and adjustment component includes a positioning block arranged on the clamping base, the position of the positioning block cooperates with the guide surface that has been processed on the tool holder housing, so as to position the installation position of the tool holder housing, and the clamping base is provided with workpiece adjustment blocks on both sides of the tool holder housing, and adjustment screws are screwed on the workpiece adjustment blocks, and the tool holder housing is fixed by the adjustment screws.

[0006] Preferably, the second positioning and adjusting assembly of the present invention comprises an adjusting block arranged outside the clamp body, a set screw is arranged on the adjusting block, and the end of the set screw abuts 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 of the present invention is locked and fixed to the base by screws, and an adjustment hole matching the screw is provided on the clamp body. When adjusting the position of the clamp body, the adjustment hole is used to move relative to the screw. After adjustment into place, the clamp body is locked to the base using screws.

[0008] Preferably, a counterweight block for balancing the centrifugal force generated by the rotation is arranged on the base of the present invention at a position symmetrical to the clamp body, and the counterweight block is used to ensure smooth rotation during the processing 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, and the elastic support block moves up and down relative to the base when subjected to force through a spring. When the tool holder housing and the clamp are positioned, an upward supporting force is provided by the elastic support block to balance the deadweight of the tool holder housing.

[0010] The present invention also discloses a method for processing a tool holder housing of a worm wheel gear grinding machine, using the above-mentioned processing device, comprising the steps of: S01. Rough machining is performed on the parts of the tool holder housing, leaving machining allowances for the guide rail surface and opening of the tool holder housing; S02, using a guide rail grinder to perform fine machining on the guide rail surface of the tool holder housing, and using the machined guide rail surface as a reference to perform fine boring machining on the opening on the tool holder housing, and leaving a grinding allowance for the opening corresponding to the spindle hole; S03, using a fixture of a processing device to clamp and fix the tool holder housing, and adjusting the position of the fixture on the base to ensure the hole distance between the spindle hole and the guide rail surface; S04. Start the vertical mill to grind the spindle hole.

[0011] Preferably, in step S03 of the present invention, when using a tooling fixture to position the tool holder housing, the position of the clamp is first adjusted according to the position of the clamp on the base and the center distance requirement between the spindle hole and the guide surface on the tool holder housing, and initial positioning is performed. After the initial positioning, the position of the current spindle hole is within the range of the target processing spindle hole, and then the vertical mill is started for trial grinding. After the circular hole is processed, the tool holder housing is removed, and the degree of eccentricity between the center position of the circular hole and the center of the target spindle hole is detected. According to the detection result, the position of the clamp is accurately adjusted, and then the tool holder housing is installed to grind one end of the spindle hole. After the processing is completed, the other end of the spindle hole is ground with the center of the processed 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 by using a fixture in the present invention, the elastic support auxiliary mechanism on the base provides support force for the tool holder housing, and the positioning surface of the positioning block on the clamp body cooperates with the machined guide surface on the tool holder housing, and then the adjustment screw on the workpiece adjustment block is connected to the tool holder housing to complete the relative position positioning between the tool holder housing and the clamp body. When the clamp body is moved, the tool holder housing moves synchronously.

[0013] Beneficial effects: The worm wheel gear grinding machine tool holder housing processing device and processing method disclosed in the present invention have the following beneficial effects: 1. The present invention uses a tooling fixture to adjust and position the tool holder housing on the vertical mill, and can adjust the relative position of the spindle hole and the vertical mill spindle in the X and Y directions, so that the vertical mill can be used to grind the spindle hole on the tool holder housing, ensuring the coaxiality of the spindle hole, ensuring the accuracy of the tool holder housing, and extending 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, thereby preventing the tool holder housing from tilting and reducing 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 relatively fix the tool holder housing and the clamp body, ensuring the uniform position of the tool holder housing each time it is installed, thereby ensuring that while the second positioning adjustment component is used to adjust the position of the clamp body, the position of the spindle hole on the tool holder housing is synchronously adjusted, thereby improving the accuracy of positioning.

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

[0017] 5. When the present invention is performing the spindle hole grinding process, a trial process is first performed based on the initial positioning result, and then the circular hole produced by the trial process is tested to confirm the deviation of the spindle hole center from the requirement, so that the positioning accuracy of the spindle hole can be ensured by adjusting the position of the clamp body for a second time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 It is a top view of the processing device of the present invention; Figure 2 is a side sectional view of the processing device of the present invention; Figure 3 A schematic diagram of the spindle hole structure processed by 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 surface, 8-workpiece adjustment block, 9-adjusting screw, 10-adjusting block, 11-setting screw, 12-counterweight block, 13-elastic support block, 14-spring. DETAILED DESCRIPTION

[0020] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by way of explanation of the apparatus, composition and materials of the present disclosure, rather than limitation. On the contrary, the following description provides a convenient illustration of an exemplary embodiment for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations may be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0021] like Figure 1-Figure 2 As shown, the present invention discloses a worm wheel gear grinding machine tool holder housing processing device, which is used Figure 3The grinding process of the spindle hole 2 on the tool holder housing 1 shown in the figure, the processing device includes a vertical mill and a fixture arranged on the vertical mill workbench for clamping and fixing the tool holder housing 1, the fixture includes a base 3, a clamp body 4 for cooperating with the tool holder housing 1 for positioning and fixing, a positioning adjustment mechanism for adjusting the position of the clamped tool holder housing 1 is arranged on the clamp body 4, and an elastic support auxiliary mechanism 5 for assisting the positioning and fixing between the tool holder housing 1 and the clamp body 4 is arranged below the installation position of the tool holder housing 1. The present invention uses the clamp body 4 to drive the tool holder housing 1 to move on the base 3 for position adjustment, so as to overcome the defect that the existing vertical mill processing equipment can only perform position adjustment in a single direction and cannot ensure the center distance requirements in two directions between the spindle hole 2 of the tool holder housing 1 and the corresponding guide surface. The vertical mill is used to grind the height of the spindle hole, which can better ensure the cylindricity and coaxiality of the spindle hole, and high-speed grinding can also ensure better roughness.

[0022] In a specific embodiment, the positioning and adjustment mechanism of the present invention includes a first positioning and adjustment component for positioning and fixing the relative position between the tool holder housing 1 and the clamping body 4, and a second positioning and adjustment component for positioning and fixing the position of the clamping body 4 on the base 3. The first positioning component is used to maintain the uniform position of the tool holder housing 1 and the clamping body 4 after they are fixed, and the second positioning and adjustment component is used to make the spindle hole to be processed concentric with the base 3; the first positioning and adjustment component includes a positioning block 6 arranged on the clamping body 4, and the position of the positioning block 6 cooperates with the guide surface 7 that has been processed on the tool holder housing 1 to position the installation position of the tool holder housing 1. The clamping body 4 is provided with workpiece adjustment blocks 8 on both sides of the tool holder housing 1, and adjustment screws 9 are screwed on the workpiece adjustment blocks 8, and the tool holder housing 1 is fixed by the adjustment screws 9.

[0023] The second positioning and adjustment component of the present invention includes an adjustment block 10 arranged on the outside of the clamp body 4, and a set screw 11 is arranged 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 and the base are locked and fixed by screws, and an adjustment hole matching the screw is provided on the clamp body 4. When the position of the clamp body 4 is adjusted, it moves relative to the screw through the adjustment hole. After adjustment into place, the clamp body 4 is locked on the base 3 using the screw.

[0024] When 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, so that no deviation occurs in the axial direction. The present invention uses an elastic support auxiliary mechanism to balance the gravity of the tool holder housing 1, so that when the tool holder housing is fixed, the position of the tool holder housing can be easily adjusted. The elastic support auxiliary mechanism 5 of the present 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 through a spring 14. When positioning the tool holder housing 1 and the clamp body 4, the elastic support block 13 provides an upward support force to balance the deadweight of the tool holder housing 1, thereby reducing the difficulty of installing and positioning the tool holder housing and quickly achieving installation and fixation. The base 3 of the present invention is provided with a counterweight block 12 for balancing the centrifugal force generated by the rotation at a symmetrical position with the clamp body 4. The counterweight block 12 is used to ensure the smooth rotation of the spindle hole 2 during processing, thereby ensuring the final spindle hole processing quality.

[0025] The present invention also discloses a method for processing a tool holder housing of a worm wheel gear grinding machine, using the above-mentioned processing device to process the spindle hole, such as Figure 3 As shown, the spindle hole of the tool holder housing is composed of several holes with different diameters along the axial direction. It is precisely because the diameter of the middle area is smaller than the diameters of the two ends that the two ends need to be processed.

[0026] The processing method of the present invention comprises the steps of: S01. Rough machining is performed on the parts of the tool holder housing, leaving machining allowances for the guide rail surface and opening of the tool holder housing; S02, using a guide rail grinder to perform fine machining on the guide rail surface of the tool holder housing, and using the machined guide rail surface as a reference to perform fine boring machining on the opening on the tool holder housing, and leaving a grinding allowance for the opening corresponding to the spindle hole; S03, using a fixture of a processing device to clamp and fix the tool holder housing, and adjusting the position of the fixture on the base to ensure the hole distance between the spindle hole and the guide rail surface; When using a tool fixture to position the tool holder housing, the elastic support auxiliary mechanism on the base provides support force for the tool holder housing, and the positioning surface of the positioning block on the clamp body cooperates with the machined guide surface on the tool holder housing, and then is connected to the tool holder housing through the adjustment screw on the workpiece adjustment block to complete the relative position positioning between the tool holder housing and the clamp body. When the clamp body moves, the tool holder housing moves synchronously.

[0027] Then, according to the position of the clamp on the base and the center distance requirements of the spindle hole and the guide surface on the tool holder housing, the position of the clamp is adjusted to perform initial positioning. After the initial positioning, the current position of the spindle hole is within the range of the target processing spindle hole. Then start the vertical mill for trial grinding. After the circular hole is processed, remove the tool holder housing, and detect the eccentricity between the center position of the circular hole and the center of the target spindle hole. According to the test results, install the tool holder housing again, and accurately adjust the position of the clamp on the base to keep the center distance between the spindle hole processed by the vertical mill and the guide surface meeting the requirements.

[0028] S04. Start the vertical mill to grind the spindle hole. When grinding the spindle hole, the magnetic disk of the vertical mill clamps the base, controls the outer circle runout of the base within 0.005mm, keeps the center distance of the base magnetic disk in compliance with the requirements, drives the base to rotate synchronously through the magnetic disk to grind the spindle hole, and after machining the aperture structure of the corresponding end, remove the fixture, adjust the surface of the tool holder shell, and align and position the spindle hole of the grinding part of the tool holder shell, and grind the other end of the spindle hole, so as to ensure that the coaxiality of the holes at both ends of the spindle hole meets the requirements and extend the life of the spindle bearing of the gear grinding machine tool holder.

Claims

1. A worm wheel gear grinding machine tool holder housing processing device, used for grinding a spindle hole (2) on a tool holder housing (1), characterized in that: The processing device comprises a vertical mill and a fixture arranged on a workbench of the vertical mill for clamping and fixing a tool holder housing (1); the fixture comprises a base (3), a clamping body (4) for cooperating with the tool holder housing (1) for positioning and fixing; a positioning adjustment mechanism for adjusting the position of the clamped tool holder housing (1) is arranged on the clamping body (4); and an elastic support auxiliary mechanism (5) for assisting the positioning and fixing between the tool holder housing (1) and the clamping body (4) is arranged below the installation position of the tool holder housing (1).

2. A worm wheel gear grinding machine tool holder housing processing device according to claim 1, characterized in that: The positioning and adjustment mechanism comprises a first positioning and adjustment component for positioning and fixing the relative position between the tool holder housing (1) and the clamping body (4) and a second positioning and adjustment component for positioning and fixing the position of the clamping body (4) on the base (3); the first positioning component is used to keep the positions of the tool holder housing (1) and the clamping body (4) uniform after being fixed, and the second positioning and adjustment component is used to make the spindle hole to be processed concentric with the base (3); the first positioning and adjustment component comprises a positioning block (6) arranged on the clamping body (4); the position of the positioning block (6) matches 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 clamping body (4) is provided with workpiece adjustment blocks (8) on both sides of the tool holder housing (1), and adjustment screws (9) are screwed on the workpiece adjustment blocks (8); the tool holder housing (1) is fixed by the adjustment screws (9).

3. The worm wheel gear grinding machine tool holder housing processing device according to claim 2, characterized in that: The second positioning adjustment assembly comprises an adjustment block (10) arranged outside the clamp body (4), a set screw (11) being arranged on the adjustment block (10), and an end of the set screw (11) abutting against a surface of the clamp body (4) to adjust the position of the clamp body (4) on the base (3).

4. The worm wheel gear grinding machine tool holder housing processing device according to claim 3, characterized in that: The bottom of the clamp body (4) is locked and fixed to the base by means of screws. An adjustment hole matching the screw is provided on the clamp body (4). When the position of the clamp body (4) is adjusted, the adjustment hole is used to move relative to the screw. After the position of the clamp body (4) is adjusted into place, the screw is used to lock the clamp body (4) on the base (3).

5. The worm wheel gear grinding machine tool holder housing processing device according to claim 1, characterized in that: A counterweight (12) for balancing the centrifugal force generated by the rotation is arranged on the base (3) at a position symmetrical to the clamp body (4). The counterweight (12) ensures that the spindle hole (2) rotates smoothly during machining.

6. The worm wheel gear grinding machine tool holder housing processing device 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 via a spring (14); when the tool holder housing (1) and the clamp body (4) are positioned, an upward support force is provided via the elastic support block (13) to balance the deadweight of the tool holder housing (1).

7. A method for processing a tool holder housing of a worm wheel gear grinding machine, using the processing device according to any one of claims 1 to 6, characterized in that: Includes steps: S01. Rough machining is performed on the parts of the tool holder housing, leaving machining allowances for the guide rail surface and opening of the tool holder housing; S02, using a guide rail grinder to perform fine machining on the guide rail surface of the tool holder housing, and using the machined guide rail surface as a reference to perform fine boring machining on the opening on the tool holder housing, and leaving a grinding allowance for the opening corresponding to the spindle hole; S03, using a fixture of a processing device to clamp and fix the tool holder housing, and adjusting the position of the fixture on the base to ensure the hole distance between the spindle hole and the guide rail surface; S04. Start the vertical mill to grind the spindle hole.

8. The method for processing a tool holder housing of a worm wheel gear grinding machine according to claim 7, characterized in that: In step S03, when the tool holder housing is positioned using a fixture, the position of the clamp is first adjusted according to the position of the clamp on the base and the center distance requirement between the spindle hole and the guide surface on the tool holder housing, and initial positioning is performed. After the initial positioning, the current position of the spindle hole is within the range of the target processing spindle hole, and then the vertical mill is started for trial grinding. After the circular hole is processed, the tool holder housing is removed, and the degree of eccentricity between the center position of the circular hole and the center of the target spindle hole is detected. According to the detection result, the position of the clamp is accurately adjusted, and then the tool holder housing is installed to grind one end of the spindle hole. After the processing is completed, the other end of the spindle hole is ground with the center of the processed spindle hole to ensure the coaxiality of the openings at both ends of the spindle hole.

9. A method for processing a tool holder housing of a worm wheel gear grinding machine according to claim 7 or 8, 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 for the tool holder housing, and the positioning surface of the positioning block on the clamp body cooperates with the machined guide surface on the tool holder housing, and then is connected to the tool holder housing through the adjustment screw on the workpiece adjustment block to complete the relative position positioning between the tool holder housing and the clamp body. When the clamp body is moved, the tool holder housing moves synchronously.

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