Machining clamp for motor shell

Abstract

The utility model relates to a machining fixture for a motor shell, which comprises a base, three upright posts are fixedly mounted on the base, the three upright posts are distributed on the base in a triangular shape, and a lower positioning hole matched with the shape of the bottom end of the motor shell is formed in the base; the lower positioning holes are positioned among the three upright posts; pressing plates are symmetrically arranged on the two sides of the lower positioning hole and transversely slide on the base; a positioning plate is arranged at the top of the stand column, the positioning plate is detachably installed on the stand column, an upper positioning hole matched with the top end of the motor shell is formed in the positioning plate, and the upper positioning hole and the lower positioning hole are coaxially formed. An upper positioning hole and a lower positioning hole are matched to enable the motor shell to be in a vertical state, and then the motor shell is fixed through a pressing plate; in the machining process, a tool of machining equipment can penetrate through the whole motor shell, and therefore all mounting holes in the motor shell can be machined in place at a time; therefore, the coaxiality of all the mounting holes in the motor shell is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a machining clamp for a motor housing. Background Art

[0002] The electric motor is a device that converts electrical energy into mechanical energy. It is used in various industries. For example, in electric drills, it is well known that the electric drill is equipped with a motor, a reduction box and a chuck. The reduction box of the existing electric drill is fixedly installed with the motor through fasteners, so that the output shaft of the motor is directly connected to the gear in the reduction box. The purpose of this setting is to reduce the volume and the transmission energy consumption. Therefore, the motor housing needs to be provided with a reduction box mounting hole 001 and a rotor mounting hole 002 (such as Figure 1 Therefore, the precision requirement for machining the motor housing is relatively high. The precision of the motor housing is usually determined by the precision of the machining equipment (CNC machining precision) and the clamping precision of the fixture.

[0003] In order to ensure the accuracy of the motor housing, a Chinese patent with publication number CN111659915A discloses a CNC machine tool fixture for motor housing processing, which relates to a fixture for solving the problem that the housing is easily deformed when ordinary fixtures are clamped, including a hydraulic three-claw chuck installed on a frame, and also including a centering support block fixed on the claws of the hydraulic three-claw chuck, the number of the centering support blocks is equal to the number of the claws, and a plurality of centering support blocks are spliced ​​to form a hollow centering column; the present invention has the following advantages and effects: the centering support block in the form of an internal support can correct the housing in the process of supporting the housing, reduce the offset of the central axis of the housing during the positioning process, so as to facilitate the subsequent tool alignment to find the position of the central axis of the housing, improve the coaxiality between the shaft hole on the housing and the inner cavity of the housing, so as to achieve the purpose of reducing the housing scrap rate. In the process of processing using the above scheme, due to the centering support block, each processing can only be completed on one end of the motor housing, and then the motor housing is removed from the fixture and rotated 180 degrees. Process the other end of the motor. One more clamping will have a greater impact on the coaxiality. If the motor housing is clamped and processed using a three-jaw chuck, the housing will be slightly deformed during the clamping process, making the coaxiality of the motor housing worse. Utility Model Content

[0004] The utility model aims to provide a processing fixture for a motor housing, in order to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a processing fixture for a motor housing, comprising a base, on which three columns are fixedly installed, and the three columns are distributed on the base in a triangular shape, and the base is provided with a lower positioning hole adapted to the shape of the bottom end of the motor housing; the lower positioning hole is located between the three columns; pressure plates are symmetrically arranged on both sides of the lower positioning hole, and the pressure plates slide horizontally on the base; a positioning plate is arranged on the top of the column, and the positioning plate is detachably installed on the column, and the positioning plate is provided with an upper positioning hole adapted to the top end of the motor housing, and the upper positioning hole is coaxially arranged with the lower positioning hole.

[0006] Compared with the prior art, the cooperation of the upper positioning hole and the lower positioning hole makes the motor housing in a vertical state, and then the pressure plate is used to fix the motor housing; during the processing, the tool of the processing equipment can pass through the entire motor housing, so all the mounting holes in the motor housing can be processed in place at one time; thereby ensuring the coaxiality of all the mounting holes in the motor housing.

[0007] According to the preferred technical solution of the utility model, a step hole connected to the lower positioning hole is arranged on the base, and a chip removal groove connected to the step hole is arranged on the base.

[0008] According to the preferred technical solution of the utility model, a presser foot is arranged at one end of the press plate, a strip hole is arranged in the middle of the press plate, a pressing rod is arranged in the strip hole, and the pressing rod is threadedly connected with the base.

[0009] According to the preferred technical solution of the utility model, a support section extending outward is arranged on the bottom surface of the pressing plate, and the support section abuts against the base; the support section and the presser foot are located at both ends of the pressing plate, and a pressing seam is arranged between the support section and the bottom surface of the pressing plate.

[0010] According to the preferred technical solution of the utility model, an arc-shaped installation groove is arranged on the top of each column, and the installation grooves on the three columns are combined into a circular receiving groove, the receiving groove is coaxially arranged with the lower positioning hole, and the positioning plate is located in the receiving groove and adapted.

[0011] According to the preferred technical solution of the utility model, the step hole comprises a central hole and a through hole which are connected through each other, the central hole is connected through each other with the lower positioning hole, and the central hole and the lower positioning hole are coaxially arranged.

[0012] According to the preferred technical solution of the utility model, the positioning plate is provided with the same number of through holes as the columns and locking holes connected to the through holes, and each column is provided with a locking rod.

[0013] According to the preferred technical solution of the utility model, a pluggable auxiliary positioning column is provided on the positioning plate, the outer cylindrical shaft of the auxiliary positioning column extends into the upper positioning hole and is provided with a positioning surface adapted to the outer shape of the motor housing, the positioning surfaces on the multiple auxiliary positioning rods are combined into a positioning groove adapted to the outer shape of the motor housing, and the positioning groove is coaxially arranged with the lower positioning hole.

[0014] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the advantages brought by the technical features of the technical solution described above, other technical problems that can be solved by the present invention, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the motor housing.

[0016] Figure 2 It is a stereoscopic schematic diagram of the assembly and measurement of the utility model.

[0017] Figure 3 It is a sectional view of the base of the utility model.

[0018] Figure 4 It is a stereoscopic schematic diagram of the utility model column isometric.

[0019] Figure 5 It is a three-dimensional schematic diagram of the auxiliary positioning column of the utility model.

[0020] Explanation of the figure numbers: 01. Base, 02. Column, 03. Lower positioning hole, 04. Pressing plate, 05. Positioning plate, 06. Upper positioning hole, 07. Step hole, 08. Chip groove, 09. Presser foot, 10. Strip hole, 11. Pressing rod, 12. Mounting groove, 13. Center hole, 14. Through hole, 15. Locking hole, 16. Locking rod, 17. Auxiliary positioning column, 18. Positioning surface, 19. Support section, 20. Pressing seam, 21. Through hole, 001. Gearbox mounting hole, 002. Rotor mounting hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] See also Figure 1-5 As shown, the processing fixture of the motor housing of the utility model is used to fix the motor housing. It is convenient for the processing equipment to process the motor and ensure the processing accuracy. It is well known that the electric drill is equipped with a motor, a reduction box and a chuck. The reduction box of the existing electric drill is fixedly installed with the motor through fasteners, so that the output shaft of the motor is directly connected to the gear in the reduction box. The purpose of this setting is to reduce the volume and reduce the transmission energy consumption. Therefore, the motor housing needs to be provided with a reduction box mounting hole 001 and a rotor mounting hole 002 (such as Figure 2Therefore, the precision requirement for machining the motor housing is relatively high. The precision of the motor housing is usually determined by the precision of the machining equipment (CNC machining precision) and the clamping precision of the fixture.

[0023] See also Figure 2 As shown, the utility model provides a processing fixture to ensure the accuracy of the motor housing during the processing, including a base 01, and the base 01 is used to be installed on the machine platform of the processing equipment. The base 01 can be square or round. If the base 01 is round, it can be used in conjunction with a horizontal lathe. If the base 01 is angular, it can be used in conjunction with a machining center or a vertical lathe. The base 01 is fixed with three columns 02 by fasteners. The three columns 02 are distributed on the base 01 in a triangular shape. The base 01 is provided with a lower positioning hole 03 that is adapted to the shape of the bottom end of the motor housing. The lower positioning hole 03 is located between the three columns 02. Pressing plates 04 are symmetrically arranged on both sides of the lower positioning hole 03, and the pressing plates 04 slide horizontally on the base 01. The pressure plate 04 is used to prevent the engine housing from shifting longitudinally and transversely during the processing. A positioning plate 05 is provided on the top of the column 02. The positioning plate 05 is detachably mounted on the column 02. The positioning plate 05 is provided with an upper positioning hole 06 adapted to the top of the motor housing. The upper positioning hole 06 is coaxially arranged with the lower positioning hole 03. At the same time, during the processing, the tool of the processing equipment can pass through the entire motor housing, so all the mounting holes in the motor housing can be processed in place at one time. This ensures the coaxiality of all the mounting holes in the motor housing.

[0024] During use, the cover plate is removed from the column 02, and the pressing plate 04 is moved laterally in the direction away from the lower positioning. Then, the motor housing is placed vertically between the three columns 02 so that the bottom end of the motor is located in the lower positioning hole 03, and the motor housing is initially positioned. Then, the pressing plate 04 is fixed on the three columns 02 so that the top of the motor housing passes through the upper positioning hole 06. The motor housing is in a vertical state through the cooperation of the upper positioning hole 06 and the lower positioning hole 03, that is, the axis of the reduction box mounting hole 001 on the motor housing and the axis of the rotor mounting hole 002 are in a vertical state. Then the pressing plate 04 is moved in the direction of the lower positioning hole 03 to fix the motor housing. Since the upper positioning hole 06 and the lower positioning hole 03 are respectively adapted to the bottom end of the motor and the top end of the motor. It can prevent the motor housing from rotating between the three columns 02 during the processing. At the same time, it also plays a role in positioning the motor housing to ensure that the motor housing is in a vertical state. Thereby ensuring the precision requirements of the processing equipment during the processing of the motor housing.

[0025] See also Figure 3As shown, the base 01 is provided with a stepped hole 07 which is connected to the lower positioning hole 03, and the base 01 is provided with a chip removal groove 08 which is connected to the stepped hole 07. The waste chips generated during the machining of the motor housing fall from the stepped hole 07 into the chip removal hole, so that the operator can remove the waste chips from the chip removal groove 08. This prevents the chips generated during the machining from being left in the motor housing and affecting the machining of the tool on the machining equipment.

[0026] A presser foot 09 is provided at one end of the pressing plate 04. During use, the presser foot 09 is inserted into the exhaust hole on the motor housing (such as Figure 2 As shown in the figure, the presser foot 09 can also be pressed on other pressure points on the motor housing. A strip hole 10 is provided in the middle of the pressing plate 04, and a pressing rod 11 is provided in the strip hole 10. The pressing rod 11 is preferably a fastener. The pressing rod 11 is threadedly connected to the base 01. When the pressing plate 04 needs to move horizontally on the base 01, the pressing rod 11 provides a guiding effect for the pressing plate 04. When the pressing plate 04 needs to press the motor housing, the pressing rod 11 provides a pressing force for the pressing plate 04.

[0027] The bottom surface of the pressing plate 04 is provided with a support section 19 extending outward, and the support section 19 abuts against the base 01. The support section 19 and the presser foot 09 are located at both ends of the pressing plate 04, and a pressing gap 20 is provided between the support section 19 and the bottom surface of the pressing plate 04. When in use, by screwing the pressing rod 11, the presser foot 09 on the pressing plate 04 moves toward the base 01 when the pressing gap 20 becomes smaller, thereby achieving the purpose of pressing the motor housing.

[0028] See also Figure 4 As shown, a circular arc-shaped mounting groove 12 is provided on the top of each column 02, and the mounting grooves 12 on the three columns 02 are combined into a circular receiving groove, which is coaxially arranged with the lower positioning hole 03, and the positioning plate 05 is located in the receiving groove and adapted. Since the step hole 07 includes a central hole 13 and a through hole 21 that are connected through, the central hole 13 is connected through the lower positioning hole 03, and the central hole 13 is coaxially arranged with the lower positioning hole 03. And one-time processing and molding are adopted in the process of processing the lower positioning hole 03 and the step hole 07. Therefore, when the three columns 02 are fixedly installed on the base 01, the coaxiality of the receiving groove and the central hole 13 and the roundness of the receiving groove are measured by the three coordinates in the prior art based on the central hole 13. The three columns 02 are adjusted according to the measurement results of the three coordinates to ensure the coaxiality of the receiving groove and the central hole 13 and the roundness of the receiving groove. In order to ensure the coaxiality of the receiving groove and the center hole 13 and the roundness of the receiving groove, another processing method can be used, where the three columns 02 are fixedly mounted on the base 01 by welding, and the receiving groove, the lower positioning hole 03, and the step hole 07 are processed at the same time in a one-time processing method, thereby ensuring the coaxiality between the three.

[0029] See also Figure 2 As shown, the positioning plate 05 is provided with the same number of through holes 14 as the columns 02 and locking holes 15 connected with the through holes 14, and each column 02 is provided with a locking rod 16, and the locking rod 16 is preferably a fastener. When in use, the through holes 14 on the positioning plate 05 are aligned with the locking rod 16, and the locking rod 16 is passed through the through holes 14 on the positioning plate 05, so that the positioning plate 05 is located in the receiving groove, and then the locking holes 15 on the positioning plate 05 are clamped on the locking rod 16 by rotating the positioning plate 05, and the locking rod 16 is screwed to fix the positioning plate 05. Otherwise, the positioning plate 05 can be taken out of the receiving groove. The design of the locking holes 15 and the through holes 14 is to ensure that the locking member will not be separated from the column 02 when the positioning plate 05 is installed or disassembled.

[0030] See also Figure 2 , 5 As shown, the positioning plate 05 is provided with a plurality of auxiliary holes. The present application provides three auxiliary holes on the positioning plate 05. The auxiliary holes are adjacent to the upper positioning hole 06. Auxiliary positioning columns 17 are adapted in the auxiliary holes. The auxiliary positioning columns 17 are designed to achieve pluggable connection with the positioning plate 05. The outer cylindrical shaft of the auxiliary positioning column 17 extends into the upper positioning hole 06 and is provided with a positioning surface 18 adapted to the outer shape of the motor housing. The positioning surfaces 18 on the plurality of auxiliary positioning rods are combined into a positioning groove adapted to the outer shape of the motor housing. The positioning groove is coaxially arranged with the lower positioning hole 03. Since the positioning plate 05 needs to be rotated forward and reversely during the installation and removal of the positioning plate 05, the design of the auxiliary positioning column 17 prevents the positioning plate 05 from causing damage to the outer surface of the motor housing during rotation.

[0031] When in use, the auxiliary positioning column 17 is pulled out from the positioning plate 05, the positioning plate 05 is installed in the receiving groove, and then the auxiliary positioning column 17 is inserted into the positioning plate 05 to position and fix the motor housing. When the motor housing is processed, the auxiliary positioning column 17 is first pulled out from the positioning plate 05, and then the positioning plate 05 is removed from the receiving groove.

[0032] During the use of the utility model, the motor housing is first placed in the lower positioning hole 03, and then the positioning plate 05 is installed in the receiving groove, and then the auxiliary positioning column 17 is inserted into the positioning plate 05, and the lower end of the motor housing is positioned through the lower positioning hole 03, and then the upper end of the motor housing is positioned through the auxiliary positioning column 17, so as to ensure that the motor housing is in a vertical state. And ensure that the reduction box mounting hole 001 and the rotor mounting hole 002 on the motor housing are on the same axis. Finally, the pressing plate 04 is used to fix the motor housing. After the fixation is completed, the reduction box mounting hole 001 and the rotor mounting hole 002 are processed once through external settings to ensure the coaxiality accuracy between the two.

[0033] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A machining fixture for a motor housing, comprising a base, characterized in that: The base is fixed with three columns, which are distributed in a triangle shape on the base. The base is provided with a lower positioning hole that matches the shape of the bottom end of the motor housing; the lower positioning hole is located between the three columns; pressure plates are symmetrically arranged on both sides of the lower positioning hole, and the pressure plates slide horizontally on the base; a positioning plate is arranged on the top of the column, and the positioning plate is detachably installed on the column, and the positioning plate is provided with an upper positioning hole that matches the top end of the motor housing, and the upper positioning hole is coaxially arranged with the lower positioning hole.

2. The processing fixture for the motor housing according to claim 1, characterized in that: The base is provided with a step hole which is connected with the lower positioning hole through and through, and the base is provided with a chip removal groove which is connected with the step hole through and through.

3. The processing fixture for the motor housing according to claim 1, characterized in that: A press foot is arranged at one end of the pressing plate, a strip hole is arranged in the middle of the pressing plate, a pressing rod is arranged in the strip hole, and the pressing rod is threadedly connected with the base.

4. The processing fixture for the motor housing according to claim 3 is characterized in that: A support section extending outward is arranged on the bottom surface of the pressing plate, and the support section is in contact with the base; the support section and the press foot are located at two ends of the pressing plate, and a pressing seam is arranged between the support section and the bottom surface of the pressing plate.

5. The machining fixture for the motor housing according to claim 1, characterized in that: An arc-shaped installation groove is arranged on the top of each column. The installation grooves on the three columns are combined into a circular receiving groove. The receiving groove is coaxially arranged with the lower positioning hole. The positioning plate is located in the receiving groove and adapted.

6. The machining fixture for the motor housing according to claim 2, characterized in that: The step hole comprises a central hole and a through hole which are connected through each other. The central hole is connected through each other with the lower positioning hole, and the central hole and the lower positioning hole are coaxially arranged.

7. The machining fixture for the motor housing according to claim 1, characterized in that: The positioning plate is provided with the same number of through holes as the columns and locking holes connected with the through holes, and each column is provided with a locking rod.

8. The machining fixture for the motor housing according to claim 1, characterized in that: The positioning plate is provided with an auxiliary positioning column that can be plugged in and out. The outer cylindrical shaft of the auxiliary positioning column extends into the upper positioning hole and is provided with a positioning surface that is adapted to the shape of the motor housing. The positioning surfaces on multiple auxiliary positioning rods are combined into a positioning groove that is adapted to the shape of the motor housing. The positioning groove is coaxially arranged with the lower positioning hole.

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