Box tool fixture for race shaft

Abstract

The utility model discloses a ring shaft box tool fixture relates to tool fixture technical field, including the tool base plate of installation in the finish machining workstation surface, both sides fixedly connected with the isohypse support spare of tool base plate top, the surface of isohypse support spare is located with the positioning pin hole, the inside fixedly connected with the positioning pin of positioning pin hole, the inside fixedly connected with screw rod of isohypse support spare, the upper end of screw rod is inserted with first circular arc locking block. The utility model discloses through first circular arc locking block and second circular arc locking block inner arc surface respectively adapt workpiece big, small end face radian, cooperate the 9 of tooth surface dynamic direction steel ball screw support spare degree rotation steel ball and adhere workpiece outer circle, need not manual adjustment to realize stable locking, positioning pin conical design is convenient for workpiece fast suit and set, and isohypse support spare and isohypse block 145mm accurate difference, and the quick butt joint of tool base plate positioning key and center pin hole, replace manual repeated correction, and correct time is saved greatly.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixture technology, specifically to a ring-shaft type box-shaped tooling and fixture. Background Technology

[0002] Traditional ring-shaped housing tooling fixtures are widely used in the precision machining of ring-shaped housing parts in the mechanical manufacturing field, such as transmission housings and bearing housings. Their core purpose is to clamp and fix the workpiece during the machining process, ensuring the workpiece's stable position during drilling, tapping and other processes (especially the machining of pin holes and threaded holes on large and small end faces), and avoiding machining accuracy deviations caused by workpiece displacement. They are key auxiliary equipment to ensure that the dimensional accuracy and geometric tolerances of the parts meet the standards.

[0003] However, in the batch processing of circular workpieces such as ring-shaped box-shaped workpieces, traditional fixtures lack a dedicated locking structure suitable for circular workpieces. The workpiece position needs to be manually adjusted and corrected repeatedly, which not only wastes a lot of correction time, but also easily affects the processing accuracy due to positioning deviation. In addition, some fixtures have complex structures, cumbersome loading and unloading operations, and high fixture manufacturing and maintenance costs, making it difficult to meet the needs of efficient and accurate batch production. Utility Model Content

[0004] This utility model provides a ring-shaft type box-shaped tooling fixture to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A ring-shaped box-type tooling fixture includes a tooling base plate mounted on the surface of a precision machining worktable. Equal-height support members are fixedly connected to both sides of the top of the tooling base plate. Positioning pin holes are formed on the surface of each equal-height support member, and positioning pins are fixedly connected inside the positioning pin holes. A screw is fixedly connected inside the equal-height support member, and a first arc-shaped locking block is inserted into the upper end of the screw. A nut is threadedly connected to the top of the screw, and the bottom of the nut abuts against the top of the first arc-shaped locking block.

[0006] A further improvement of this utility model is that: a support base is fixedly connected to the top of the tooling base plate on the side away from the equal-height support member, a second arc locking block is fixedly connected to the top of the support base by a screw, and a toothed moving steel ball screw support member is threadedly connected to the surface of the support base.

[0007] A further improvement of this utility model is that: C-shaped clamping parts are fixedly connected to both sides of the tooling base plate and to the top of the finishing workbench; external hexagonal screws are connected to the internal threads of the C-shaped clamping parts; and equal-height blocks are fixedly connected to the top of the tooling base plate and between the two sets of support seats.

[0008] A further improvement of this utility model is that: the bottom surface of the tooling base plate is provided with a keyway and a central positioning pin hole, a positioning key is adapted to be installed in the keyway, the positioning key slides with the T-slot of the finishing worktable, and the central positioning pin hole is tightly inserted with the positioning pin on the surface of the finishing worktable.

[0009] A further improvement of this utility model is that the positioning pin is made of 45 steel, and after heat treatment, the surface hardness reaches HRC28-32°. The end of the positioning pin that mates with the positioning hole of the workpiece is set as a conical structure with a cone apex angle of 30-45°.

[0010] A further improvement of this utility model is that the inner arc surface curvature of the first arc locking block and the second arc locking block are respectively adapted to the outer arc curvature of the large end face and the small end face of the workpiece, the inner arc surface roughness Ra≤1.6μm, and both are welded and formed by Q235B carbon structural steel, and the surface is treated with rust removal.

[0011] A further improvement of this utility model is that the main body of the toothed moving steel ball screw support is made of 45 steel with a Rockwell hardness of HRC28°-32°, and the steel balls embedded inside are made of SUJ2 high carbon chromium bearing steel with a Rockwell hardness of HRC62°. The main body surface is provided with a toothed structure, and the steel balls can rotate in a 9° direction to fit the outer circle of the workpiece.

[0012] A further improvement of this utility model is that the top surface difference between the equal height block and the equal height support is 145mm, the parallelism tolerance of the two workpiece contact surfaces of the equal height block is ≤0.02mm, and the roughness Ra of the contact area between the contact surface and the workpiece is ≤3.2μm.

[0013] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows: This utility model provides a jig fixture for ring-shaped shaft housings. The inner arc surfaces of the first and second arc locking blocks are adapted to the curvature of the large and small end faces of the workpiece, respectively. Combined with the 9° rotating steel ball of the toothed ball screw support component, which fits the outer circle of the workpiece, stable locking can be achieved without manual adjustment. The conical design of the positioning pin facilitates quick workpiece placement. The 145mm precise height difference between the leveling support component and the leveling block, combined with the quick docking of the positioning key and the center pin hole on the jig base plate, replaces repeated manual corrections, significantly saving correction time. Furthermore, the overall structure of the fixture is simple, with core components made of Q235B and 45# steel, resulting in low cost and easy maintenance. This avoids the problems of complex structures and cumbersome loading and unloading of traditional fixtures, ensuring machining accuracy and meeting the needs of efficient and precise mass production of ring-shaped shaft housings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a schematic diagram of the surface structure of the tooling base plate of this utility model; Figure 4 This is a schematic diagram of the C-shaped clamping component of this utility model; Figure 5 This is a schematic diagram of the large end face structure of the workpiece in the installation state according to this utility model; Figure 6 This is a schematic diagram of the small end face structure of the workpiece in the installation state of this utility model.

[0015] In the diagram: 1. Precision machining worktable; 2. Tooling base plate; 3. Height equalization support; 4. Locating pin hole; 5. Locating pin; 6. First arc locking block; 7. Screw; 8. Nut; 9. Support base; 10. Second arc locking block; 11. Toothed moving steel ball screw support; 12. C-shaped clamp; 13. External hexagonal screw; 14. Height equalization block. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to embodiments: Example 1, as Figures 1-6 As shown, this utility model provides a ring-shaped box-type tooling fixture, including a tooling base plate 2 installed on the surface of a precision machining workbench 1. Equal height support members 3 are fixedly connected to both sides of the top of the tooling base plate 2. The surface of the equal height support member 3 is provided with positioning pin holes 4. Positioning pins 5 are fixedly connected inside the positioning pin holes 4. A screw rod 7 is fixedly connected inside the equal height support member 3. A first arc locking block 6 is inserted into the upper end of the screw rod 7. A nut 8 is threadedly connected to the top of the screw rod 7. The bottom of the nut 8 is tightly abutted against the top of the first arc locking block 6.

[0017] In this embodiment, the tooling fixture is first positioned and installed on the finishing worktable 1: the positioning key in the keyway on the bottom surface of the tooling base plate 2 is slidably engaged with the T-slot of the worktable, and the center positioning pin hole of the tooling base plate is tightly inserted with the positioning pin on the surface of the worktable. The tooling base plate can be quickly positioned without repeated manual calibration, ensuring the relative positional accuracy of the fixture and the worktable, providing a stable reference for subsequent workpiece processing, and avoiding processing errors caused by installation deviations of traditional fixtures.

[0018] Example 2, as Figures 1-6As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, a support base 9 is fixedly connected to the top of the tooling base plate 2 on the side away from the equal-height support member 3. A second arc locking block 10 is fixedly connected to the top of the support base 9 by a screw. A toothed moving steel ball screw support member 11 is threadedly connected to the surface of the support base 9. C-shaped clamping members 12 are fixedly connected to both sides of the tooling base plate 2 and to the top of the finishing worktable 1. An external hexagon screw 13 is threadedly connected to the inside of the C-shaped clamping member 12. An equal-height block 14 is fixedly connected to the top of the tooling base plate 2 and between the two sets of support bases 9. A keyway and a central positioning pin hole are opened on the bottom surface of the tooling base plate 2. A positioning key is adapted to be installed in the keyway. The positioning key slides with the T-slot of the finishing worktable 1. The central positioning pin hole is tightly inserted with the positioning pin on the surface of the finishing worktable 1.

[0019] In this embodiment, the tooling fixture is first positioned and installed on the finishing worktable 1: the positioning key in the keyway on the bottom surface of the tooling base plate 2 is slidably engaged with the T-slot of the worktable, and the center positioning pin hole of the tooling base plate is tightly inserted with the positioning pin on the surface of the worktable. The tooling base plate can be quickly positioned without repeated manual calibration, ensuring the relative positional accuracy of the fixture and the worktable, providing a stable reference for subsequent workpiece processing, and avoiding processing errors caused by installation deviations of traditional fixtures.

[0020] Example 3, as Figures 1-6 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, the positioning pin 5 is made of 45# steel, and after heat treatment, its surface hardness reaches HRC28-32°. The end of the positioning pin 5 that mates with the workpiece positioning hole is designed as a conical structure with a cone apex angle of 30-45°. The inner arc surfaces of the first arc locking block 6 and the second arc locking block 10 are respectively adapted to the outer arc surfaces of the large and small end faces of the workpiece. The inner arc surface roughness Ra≤1.6μm, and both are welded from Q235B carbon structural steel. After rust removal treatment, the main body of the toothed moving steel ball screw support 11 is made of 45 steel with a Rockwell hardness of HRC28°-32°. The steel balls embedded inside are made of SUJ2 high carbon chromium bearing steel with a Rockwell hardness of HRC62°. The main body surface is provided with a toothed structure, and the steel balls can rotate in a 9° direction to fit the outer circle of the workpiece. The height difference between the top surface of the equal height block 14 and the equal height support 3 is 145mm. The parallelism tolerance of the two workpiece contact surfaces of the equal height block 14 is ≤0.02mm, and the roughness Ra of the contact area between the contact surface and the workpiece is ≤3.2μm.

[0021] In this embodiment, by rotating the toothed ball screw support 11 on the surface of the support base 9, the toothed structure of the body increases the friction with the workpiece. The internal SUJ2 steel balls can rotate in a 9° direction and closely fit the outer circle of the workpiece, providing lateral auxiliary support to the workpiece and further improving the radial stability of the workpiece. This prevents the workpiece from shifting slightly due to force during processing. At the same time, by tightening the external hexagonal screws 13 in the C-shaped clamping parts 12 on both sides of the tooling base plate 2, the C-shaped clamping parts are tightly pressed against the large circular surface of the circular workpiece. During workpiece processing, all components work together to ensure accuracy. The parallelism tolerance between the high support component and the equal height block is ≤0.02mm. The positioning pin is heat-treated to ensure wear resistance and no deformation. The inner arc surface roughness Ra of the arc locking block is ≤1.6μm to reduce friction damage with the workpiece. The steel ball contact structure of the toothed moving steel ball screw support component can absorb minor vibrations. Multiple designs work together to avoid positional deviation of the workpiece during processing. At the same time, the simple structural design allows the workpiece to be disassembled after processing by simply loosening the nut and the external hexagonal screw. The loading and unloading operation is convenient and meets the high efficiency and precision requirements of batch processing of ring shaft-type box bodies.

[0022] The working principle of this ring-shaped box-type tooling fixture will be explained in detail below.

[0023] like Figures 1-6As shown, when using it, first complete the positioning and installation of the tooling fixture on the finishing worktable 1: slide the positioning key in the keyway on the bottom surface of the tooling base plate 2 with the T-slot of the worktable, and at the same time, make the center positioning pin hole of the tooling base plate tightly inserted with the positioning pin on the surface of the worktable. The tooling base plate can be quickly positioned without repeated manual calibration, ensuring the relative position accuracy of the fixture and the worktable, providing a stable reference for subsequent workpiece processing, and avoiding processing errors caused by installation deviations of traditional fixtures. Based on the circular structure and processing requirements of the ring-shaped housing, the workpiece is placed on the equal-height support 3 and the equal-height block 14. The equal-height support and the equal-height block have a pre-set top surface difference of 145mm to match the difference in the contact surface of the workpiece, allowing the workpiece to be directly positioned without adjusting the height. For the circular structure of the large and small end faces of the workpiece, the first arc locking block 6 is fitted onto the screw 7 on the equal-height support, so that its arc surface fits the inner circle of the small end face of the workpiece. Similarly, the second arc locking block 10 is fixed to the support base 9 by the screw, with its arc surface fitting the inner circle of the large end face of the workpiece. Then, the nut 8 at the top of the screw is tightened, and the nut presses down to tighten the arc locking block. By utilizing the compatibility between the inner arc surface and the inner circle of the workpiece, the circular workpiece is locked without dead angles, avoiding workpiece displacement caused by the lack of a dedicated locking structure in traditional fixtures. At the same time, the toothed ball screw support 11 on the surface of the rotating support base 9 increases the friction with the workpiece due to its toothed structure, and the internal SUJ2 steel balls can move along the toothed surface. The 9° rotation direction tightly fits the outer circle of the workpiece, providing lateral support and further enhancing its radial stability. This prevents minor displacement of the workpiece due to force during processing. Simultaneously, the external hexagonal screws 13 inside the C-shaped clamping parts 12 on both sides of the tooling base plate 2 are tightened, ensuring the C-shaped clamping parts are tightly pressed against the large circular surface of the workpiece. During workpiece processing, all components work together to ensure accuracy: the parallelism tolerance between the height support and the height block is ≤0.02mm; the positioning pin is heat-treated to ensure wear resistance and no deformation; the inner arc surface roughness Ra of the arc locking block is ≤1.6μm to reduce frictional damage to the workpiece; and the steel ball contact structure of the toothed moving steel ball screw support can absorb minor vibrations. Multiple designs work together to prevent positional deviations of the workpiece during processing. At the same time, the simple structural design allows for easy disassembly of the workpiece after processing by simply loosening the nut and the external hexagonal screw, making loading and unloading operations convenient and meeting the high-efficiency and precise requirements of batch processing of ring-shaped housings.

[0024] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A ring-shaped box-type tooling fixture, characterized in that: The tooling base plate (2) is installed on the surface of the finishing workbench (1). The tooling base plate (2) has two fixedly connected height-equalizing support members (3) on both sides of the top. The surface of the height-equalizing support member (3) is provided with positioning pin holes (4). Positioning pins (5) are fixedly connected inside the positioning pin holes (4). A screw (7) is fixedly connected inside the height-equalizing support member (3). A first arc locking block (6) is inserted into the upper end of the screw (7). A nut (8) is threadedly connected to the top of the screw (7). The bottom of the nut (8) is tightly abutted against the top of the first arc locking block (6).

2. The ring-shaped box-type tooling fixture according to claim 1, characterized in that; The tooling base plate (2) is fixedly connected to a support seat (9) on the side away from the equal height support (3) at the top. A second arc locking block (10) is fixedly connected above the support seat (9) by a screw. A toothed moving steel ball screw support (11) is threadedly connected to the surface of the support seat (9).

3. The ring-shaped box-type tooling fixture according to claim 1, characterized in that: C-shaped clamping parts (12) are fixedly connected to both sides of the tooling base plate (2) and to the top of the finishing workbench (1). The C-shaped clamping parts (12) are internally threaded with external hexagonal screws (13). Equal height blocks (14) are fixedly connected to the top of the tooling base plate (2) and between the two sets of support seats (9).

4. The ring-shaped box-type tooling fixture according to claim 1, characterized in that: The bottom surface of the tooling base plate (2) is provided with a keyway and a central positioning pin hole. A positioning key is fitted in the keyway. The positioning key slides with the T-slot of the finishing worktable (1). The central positioning pin hole is tightly inserted with the positioning pin on the surface of the finishing worktable (1).

5. The ring-shaped box-type tooling fixture according to claim 1, characterized in that: The positioning pin (5) is made of No. 45 steel. After heat treatment, the surface hardness reaches HRC28-32°. The end of the positioning pin (5) that mates with the positioning hole of the workpiece is set as a tapered structure with a tapered apex angle of 30-45°.

6. The ring-shaped box-type tooling fixture according to claim 1, characterized in that: The inner arc surface curvature of the first arc locking block (6) and the second arc locking block (10) are respectively adapted to the outer arc curvature of the large end face and the small end face of the workpiece. The inner arc surface roughness Ra≤1.6μm, and both are welded from Q235B carbon structural steel and the surface is treated with rust removal.

7. The ring-shaped box-type tooling fixture according to claim 2, characterized in that: The main body of the toothed moving steel ball screw support (11) is made of No. 45 steel with a Rockwell hardness of HRC28°-32°. The steel balls embedded inside are made of SUJ2 high carbon chromium bearing steel with a Rockwell hardness of HRC62°. The main body surface is provided with a toothed structure, and the steel balls can rotate in a 9° direction to fit the outer circle of the workpiece.

8. The ring-shaped box-type tooling fixture according to claim 3, characterized in that: The height difference between the top surface of the equal height block (14) and the equal height support (3) is 145mm. The parallelism tolerance of the two workpiece mating surfaces of the equal height block (14) is ≤0.02mm, and the roughness Ra of the mating surface and the workpiece contact area is ≤3.2μm.

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