Drilling clamp for large disc type shaft tooth parts

Abstract

The utility model discloses a drilling clamp for large-disc type shaft tooth parts. The drilling clamp comprises a cylinder support, a bottom plate, a support, an adjusting support, a double-end stud, a compression spring, a pressing plate and a pressing head. The lower end of the cylinder support is fixed on the bottom plate, and an inner hole of the cylinder support is in G6 / h6 fit with the shaft excircle of the large disc type shaft tooth workpiece; an end face ring groove, a radial chip groove and a circumferential chip groove are formed in the upper end face of the cylinder support, the disc of the workpiece is arranged on the upper end face of the cylinder support, and the position of a threaded hole to be machined in the disc of the workpiece corresponds to the end face ring groove. The supports are evenly distributed around the cylinder support in the circumferential direction, the lower ends of the supports are connected with the bottom plate, and the upper ends of the supports are connected with the pressing plate through studs and adjusting supports. The pressing plate and the pressing head can press a workpiece and reserve a machining position. According to the utility model, the threaded through hole of the large-disc type shaft tooth part can be accurately machined.

Description

Technical Field

[0001] The utility model relates to a drilling fixture for large-plate shaft gear parts. Background Art

[0002] With the popularization of electro-hydraulic products, there are more and more integrated gear and shaft parts. The integrated gear and shaft structure parts integrate the structure of the disc gear and the shaft gear, and the structural strength of the parts is relatively good; however, the integration of the structure brings a series of problems to the machining of the parts, increasing the difficulty of the parts processing.

[0003] The turbine shaft is a gear-shaft integrated part, with a large thin plate + shaft gear structure, and the thin plate structure is located at the shaft end. In conjunction with the overall heat treatment requirements, the part has extremely poor processability. The threaded hole at the thin plate has position requirements, the part's reference outer circle is short, and the part's structural problems cause the center of gravity to be biased to one side, making drilling difficult. In order to solve this problem, a special drilling fixture for large-plate shaft gear parts needs to be designed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a large-disc shaft gear part drilling fixture to solve the problem of difficulty in drilling threaded through holes on the thin disk at the shaft end of a turbine shaft.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A large-plate type shaft gear part drilling fixture, comprising a cylindrical support, a base plate, a bracket, an adjustment support, a stud, a compression spring, a pressure plate, and a pressure head;

[0007] The lower end of the cylindrical support is fixed to the bottom plate by a hexagon socket head screw. The inner hole of the cylindrical support and the outer circle of the shaft of the large-disc shaft gear workpiece adopt G6 / h6 matching, which can not only locate the radial position of the workpiece, but also ensure the position requirements of the 20 threaded holes on the workpiece disc; the upper end face of the cylindrical support is provided with an end face ring groove, a radial chip removal groove and a circumferential chip removal groove. The disc of the workpiece is placed on the upper end face of the cylindrical support, and the position of the threaded hole to be processed on the disc of the workpiece corresponds to the end face ring groove;

[0008] The plurality of brackets are uniformly distributed around the cylindrical support in the circumferential direction, the lower end of the bracket is connected to the base plate by a hexagon socket head screw and a washer, and the upper end of the bracket is connected to the pressure plate by a stud and an adjusting support; the height of the stud and the adjusting support can be adjusted by a hexagonal nut located at the upper end of the bracket and arranged at one end of the stud and one end of the adjusting support; the other end of the adjusting support extends into the keyway on the bottom surface of the pressure plate and cooperates with the keyway on the bottom surface, the other end of the stud passes through the through keyway of the pressure plate and is connected to the pressure plate by a hexagonal nut; the compression spring is sleeved on the stud, and the two ends of the compression spring are the hexagonal nut at one end of the stud and the pressure plate respectively;

[0009] The head of the pressure plate is a U-shaped end and is provided with two pressure point inner holes. The U-shaped end can be placed directly above the threaded hole to be processed in the workpiece, and the notch of the U-shaped end corresponds to the threaded hole processing position; a through keyway is opened in the middle of the pressure plate, and a bottom keyway is provided on the bottom surface of the pressure plate. The length directions of the through keyway and the bottom keyway are along the radial direction of the upper end surface of the cylindrical support so that the pressure plate can move along the radial direction without swinging left and right; the upper end of the pressure head is located in the pressure point inner hole and is connected to the pressure plate by a hexagonal cylindrical head screw.

[0010] The utility model also includes the following technical features:

[0011] Specifically, the axial length of the cylindrical support is greater than the axial length of the large-disk type shaft gear workpiece.

[0012] Specifically, the cylindrical support has multiple radial chip grooves on the upper end face and are evenly distributed along the circumference of the upper end face, and multiple circumferential chip grooves are evenly distributed along the circumference of the upper end face; the radial chip grooves are open at the edge of the upper end face, and the circumferential chip grooves are arranged at the bottom of the end face annular groove.

[0013] Specifically, a keyway-shaped through hole is provided on the middle side wall of the cylindrical support so as to reduce the weight of the tooling and observe the clamping state of the workpiece.

[0014] Specifically, the pressing head is made of copper and is in the shape of a stepped cylinder. The outer circle of the step at the upper end of the pressing head matches the inner hole of the pressing point of the pressing plate.

[0015] Specifically, a lifting lug is provided on the bottom plate to facilitate installation and disassembly of the clamp.

[0016] Specifically, the adjustment support head is a semi-spherical structure, and the semi-spherical structure and the upper cylinder are finely processed to match the keyway on the bottom surface of the pressure plate.

[0017] Specifically, the cylindrical end of the stud is finely machined to cooperate with the through keyway of the pressure plate.

[0018] Compared with the prior art, the utility model has the following technical effects:

[0019] The utility model supports the end face of the processing position, which can not only limit the center position of the part, but also reduce the influence of the cutting force on the end face of the part during processing through the support; the clamping point is directly above the support to achieve effective clamping; the threaded holes are densely located on the circumference of the part, and the pressure head is designed with a special structure to ensure smooth drilling of the part; the clamping mechanism limits circumferential rotation to ensure the consistency of the fixture after one-time up and down movement, so as to ensure that the part can be processed continuously. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the main view of the assembly drawing.

[0021] Figure 2 This is the top view of the assembly drawing.

[0022] Figure 3 Schematic diagram of cylinder support.

[0023] Figure 4 Schematic diagram of the pressure plate.

[0024] Figure 5 Schematic diagram of the pressure head.

[0025] Figure 6 Schematic diagram of adjusting support.

[0026] Figure 7 Schematic diagram of a double-ended stud.

[0027] The meaning of each number in the figure is:

[0028] 1. Base plate, 2. Bracket, 3. Washer, 4. Hexagon socket head screw, 5. Lifting ear, 6. Hexagon nut, 7. Adjustment support, 8. Compression spring, 9. Cylinder support, 10. Pressure head, 11. Stud, 12. Pressure plate. DETAILED DESCRIPTION

[0029] The turbine shaft in the utility model has a total length of 374.5, which is a typical shaft part; the shaft end is equipped with a φ260*12mm thin plate, and the center of gravity of the part is biased towards the large plate side, and the processability is relatively poor. The large end surface of the thin plate has 20 M12 threaded through holes evenly distributed circumferentially at the φ230 sub-circle, and the position accuracy is required to be φ0.5. In order to solve the problem of drilling threaded through holes, a special drilling fixture was designed. Due to the structure of the part, when placed horizontally, the center of gravity of the part is biased towards the large plate side, and the center of gravity is unstable; the thickness of the large plate is only 10mm, and the outer circle is φ260mm, which is a typical thin wall. Taking comprehensive considerations, the part can only be placed vertically with the outer circle of the shaft as the center reference; supporting the end face of the processing position can not only limit the center position of the part, but also reduce the impact of the cutting force on the end face of the part during processing through support; the clamping point is directly above the support to achieve effective clamping; the threaded holes are too densely located on the circumference of the part, and the pressure head is designed with a special structure to ensure smooth drilling of the part; the clamping mechanism limits circumferential rotation to ensure the consistency of the fixture after one up and down operation, so as to ensure continuous processing of the part.

[0030] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0031] Embodiment 1:

[0032] like Figures 1 to 7As shown, this embodiment provides a large-disk shaft gear part drilling fixture, including a cylindrical support 9, a base plate 1, a bracket 2, an adjustment support 7, a stud 11, a compression spring 8, a pressure plate 12, and a pressure head 10.

[0033] The lower end of the cylindrical support 9 is fixed to the base plate 1 by a hexagon socket head screw 4. The cylindrical support 9 is designed as a cylindrical structure for supporting and limiting the workpiece; the inner hole of the cylindrical support 9 and the outer circle of the shaft of the large-disc shaft gear workpiece adopt G6 / h6, which can not only locate the radial position of the workpiece, but also facilitate the smooth loading and unloading of the parts, and at the same time ensure the position requirements of the 20 threaded holes on the workpiece disc; the upper end face of the cylindrical support 9 is provided with an end face ring groove, a radial chip groove and a circumferential chip groove, and the disc of the workpiece is placed on the upper end face of the cylindrical support 9, and the position of the threaded hole to be processed on the disc of the workpiece corresponds to the end face ring groove; the end face ring groove, the radial chip groove and the axial chip groove can not only meet the tool travel of the tool during the processing, but also ensure that the iron chips generated during the processing are smoothly discharged to ensure the smooth progress of the processing; the rigidity of the cylindrical support 9 and the fluency of chip removal are fully considered in the design of the chip groove; the middle side wall of the cylindrical support 9 is provided with four large keyway-shaped through holes for tooling weight reduction, and the clamping state of the parts can also be observed.

[0034] Multiple brackets 2 are evenly distributed around the cylindrical support 9, and the lower end of the bracket 2 is connected to the base plate 1 through the hexagon socket head screw 4 and the washer 3, and the upper end of the bracket 2 is connected to the pressure plate 12 through the stud 11 and the adjustment support 7; the height of the stud 11 and the adjustment support 7 can be adjusted by the hexagonal nut 6 located at the upper end of the bracket 2 and arranged at one end of the stud 11 and the adjustment support 7; the other end of the adjustment support 7 extends into the keyway on the bottom surface of the pressure plate 12 and cooperates with the keyway on the bottom surface, and the other end of the stud 11 passes through the through keyway of the pressure plate 12 and is connected to the pressure plate 12 through the hexagonal nut 6; the compression spring 8 is sleeved on the stud 11, and the two ends of the compression spring 8 are the hexagonal nut 6 at one end of the stud 11 and the pressure plate 12 respectively.

[0035] The head of the pressing plate 12 is a U-shaped end with two pressure point inner holes. The U-shaped end can be placed just above the threaded hole to be processed on the workpiece, and the notch of the U-shaped end corresponds to the threaded hole processing position; the pressing plate 12 can not only press the workpiece downward, but also avoid the processing position; a through keyway is opened in the middle of the pressing plate 12, and a bottom keyway is provided on the bottom surface of the pressing plate 12. The length direction of the through keyway and the bottom keyway is along the radial direction of the upper end surface of the cylindrical support 9 so that the pressing plate 12 can move along the radial direction without swinging left and right; the length of the through keyway and the bottom keyway matches the front and rear positions of the stud 11 and the adjustment support 7. When the pressing plate 12 moves forward and backward, it can not only ensure that the pressure point is in a suitable position and presses the workpiece, but also completely withdraw from the workpiece to ensure smooth clamping and loading and unloading of the workpiece. The keyway of the pressing plate 12 is finely processed, and cooperates with the adjustment support 7 and the stud 11 to limit the left and right swing of the pressing plate 12, so that it can only move forward and backward. The upper end of the pressing head 10 is located in the inner hole of the pressing point and is connected to the pressing plate 12 through the hexagon socket head screw 4.

[0036] The axial length of the cylindrical support 9 is greater than the axial length of the large-disk type shaft gear workpiece, so that the axis of the workpiece can be placed in the cylinder of the cylindrical support 9.

[0037] The upper end surface of the cylindrical support 9 has multiple radial chip grooves evenly distributed along the circumference of the upper end surface, and multiple circumferential chip grooves evenly distributed along the circumference of the upper end surface; the radial chip grooves open at the edge of the upper end surface, and the circumferential chip grooves are arranged at the bottom of the end surface annular groove.

[0038] A keyway-shaped through hole is provided on the middle side wall of the cylindrical support 9 to reduce the weight of the tooling and observe the clamping state of the workpiece.

[0039] The material of the pressure head 10 is copper, and the shape is a stepped cylindrical shape. It cooperates with the pressure plate 12 to press tightly to avoid damaging the workpiece. The pressure head 10 is a consumable part, and the independent structure can be quickly replaced. The shape of the pressure head 10 is a stepped cylindrical shape, and the outer circle of the small step at the upper end of the pressure head 10 cooperates with the inner hole of the pressure point of the pressure plate 12.

[0040] A lifting lug 5 is provided on the bottom plate 1 , and the lifting lug 5 is installed on the bottom plate 1 through a thread, so as to facilitate the installation and disassembly of the clamp.

[0041] The head of the adjusting support 7 is a semi-spherical structure, and the semi-spherical structure and the upper cylinder are finely processed to match the keyway on the bottom surface of the pressing plate 12.

[0042] One end of the stud 11 is finely processed to cooperate with the keyway of the pressure plate 12.

[0043] When using the fixture, first loosen the hexagonal nut, and the pressure plate moves upward under the elastic force of the compression spring, so that the pressure head is away from the end face of the fixture, and at the same time, the pressure plate moves backward along the direction of the stud and the adjustment support limit, away from the outer circle of the fixture. Then put the workpiece with the small end facing down into the cylindrical support, so that the large end face of the workpiece naturally fits with the end face of the fixture; the outer circle of the workpiece cooperates with the inner hole of the cylindrical support to limit the radial position of the workpiece. Finally, push the pressure plate to move toward the workpiece and stop at the limit position. Rotate the hexagonal nut to make the pressure plate drive the pressure head to press the workpiece.

[0044] Since the workpiece has 20 threaded holes, there are holes that need to be processed in the U-shaped groove of the pressure plate and on both sides of the pressure plate, and the closest distance is 5mm, so the fixture structure is designed to be particularly compact. If the pressure plate swings left and right, it will cause interference between the pressure plate and the processing tool, resulting in failure to process. In order to solve this problem, the positions where the studs and the adjustment support cooperate with the pressure plate are finely processed to reduce the matching clearance, so that the pressure plate can only move forward and backward along the direction limited by the studs and the adjustment support, and cannot swing left and right. In this way, the consistency of the repeated actions of the pressure plate pressing and withdrawing is achieved, ensuring the smooth processing of the hole of the workpiece.

[0045] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0047] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A large-plate type shaft gear parts drilling fixture, characterized in that: It comprises a cylindrical support (9), a base plate (1), a bracket (2), an adjustment support (7), a stud (11), a compression spring (8), a pressure plate (12), and a pressure head (10); The lower end of the cylindrical support (9) is fixed to the base plate (1) by means of a hexagon socket head screw (4). The inner hole of the cylindrical support (9) and the outer circle of the shaft of the large-disk type shaft gear workpiece are matched with G6 / h6, which can not only locate the radial position of the workpiece, but also ensure the position requirements of the 20 threaded holes on the workpiece disc; the upper end face of the cylindrical support (9) is provided with an end face annular groove, a radial chip removal groove and a circumferential chip removal groove. The workpiece disc is placed on the upper end face of the cylindrical support (9), and the position of the threaded hole to be processed on the workpiece disc corresponds to the end face annular groove; The plurality of brackets (2) are evenly distributed around the cylindrical support (9); the lower end of the bracket (2) is connected to the base plate (1) via a hexagon socket head screw (4) and a washer (3); the upper end of the bracket (2) is connected to the pressure plate (12) via a stud bolt (11) and an adjustment support (7); the height of the stud bolt (11) and the adjustment support (7) can be adjusted by a screw located at the upper end of the bracket (2) and provided at one end of the stud bolt (11) and the adjustment support (7). ) is adjusted by the hexagonal nut (6) at one end of the adjusting support (7); the other end of the adjusting support (7) extends into the keyway on the bottom surface of the pressure plate (12) and cooperates with the keyway on the bottom surface, the other end of the stud (11) passes through the through keyway of the pressure plate (12) and is connected to the pressure plate (12) through the hexagonal nut (6); the compression spring (8) is sleeved on the stud (11), and the two ends of the compression spring (8) are respectively the hexagonal nut (6) at one end of the stud (11) and the pressure plate (12); The head of the pressure plate (12) is a U-shaped end and is provided with two pressure point inner holes. The U-shaped end can be placed directly above the threaded hole to be processed in the workpiece, and the notch of the U-shaped end corresponds to the threaded hole processing position; a through keyway is opened in the middle of the pressure plate (12), and a bottom keyway is provided on the bottom surface of the pressure plate (12). The length direction of the through keyway and the bottom keyway is along the radial direction of the upper end surface of the cylindrical support (9) so that the pressure plate (12) can move along the radial direction without swinging left and right; the upper end of the pressure head (10) is located in the pressure point inner hole and is connected to the pressure plate (12) through a hexagon socket head screw (4).

2. The large-disc shaft gear parts drilling fixture as claimed in claim 1, characterized in that: The axial length of the cylindrical support (9) is greater than the axial length of the large-disk type shaft gear workpiece.

3. The large-disc shaft gear parts drilling fixture as claimed in claim 1, characterized in that: The cylindrical support (9) has a plurality of radial chip removal grooves on the upper end surface that are evenly distributed along the circumference of the upper end surface, and a plurality of circumferential chip removal grooves that are evenly distributed along the circumference of the upper end surface; the radial chip removal grooves open at the edge of the upper end surface, and the circumferential chip removal grooves are arranged at the bottom of the end surface annular groove.

4. The large-disc shaft gear parts drilling fixture as claimed in claim 1, characterized in that: A keyway-shaped through hole is provided on the middle side wall of the cylindrical support (9) to reduce the weight of the tooling and observe the clamping state of the workpiece.

5. The large-disc shaft gear parts drilling fixture as claimed in claim 1, characterized in that: The pressure head (10) is made of copper and is in the shape of a stepped cylinder. The outer circle of the step at the upper end of the pressure head (10) matches the inner hole of the pressure point of the pressure plate (12).

6. The large-disc shaft gear parts drilling fixture as claimed in claim 1, characterized in that: The bottom plate (1) is provided with a lifting lug (5) to facilitate installation and removal of the clamp.

7. The large-disk shaft gear parts drilling fixture as claimed in claim 1, characterized in that: The head of the adjusting support (7) is a semi-spherical structure, and the semi-spherical structure and the upper cylinder are finely processed to match the keyway on the bottom surface of the pressing plate (12).

8. The large-disk type shaft gear parts drilling fixture as claimed in claim 1, characterized in that: One end of the stud bolt (11) is cylindrically processed to cooperate with the through keyway of the pressure plate (12).

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