Turning device for support type die casting

Abstract

The utility model relates to a turning device for a support type die casting. The turning device comprises a driving part and a turning part, the mounting flange is in butt joint with the driving part, and the driving part drives the mounting flange to rotate; the clamp is arranged on the mounting flange, the clamp comprises a clamping assembly and a positioning piece, the driving part can drive the clamping assembly to press a main body part of a workpiece, and the positioning piece extends into the workpiece and does not make contact with the upper end face and the lower end face of the workpiece; the connecting shaft is driven by the driving part to pull the movable rod, so that one end of the pressing plate tightly presses the workpiece and limits axial movement of the workpiece, meanwhile, the positioning protrusion extends into the through hole of the workpiece, elastic deformation of the workpiece is not caused while the workpiece is positioned, and the machining precision of the workpiece is improved.

Description

Technical Field

[0001] It relates to the technical field of lathe processing, and particularly relates to a turning device for bracket-shaped die-castings. Background Art

[0002] Die-casting is usually for workpieces with relatively complex shapes, including bracket-shaped workpieces such as motor housings. These bracket-shaped workpieces are die-cast from AlDC12 aluminum alloy. This material composition is close to pure aluminum, with low hardness, small strength, large plasticity, and very large stresses generated during die-casting, making it extremely prone to deformation.

[0003] When the motor bracket housing is demolded after die-casting, relatively large stresses are generated. The deformation caused by the stresses is up to about 0.5 mm. Even after shaping, the deformation amount can only be controlled within about 0.1 - 0.15 mm. The deformation has a great impact on the subsequent machining parameters. Firstly, the positioning is inaccurate. Secondly, machining deformation occurs, thus affecting the machining accuracy of the workpiece, and the situation of out-of-tolerance dimensions often occurs.

[0004] Please refer to Figure 1 , in the existing processing technology, for bracket-shaped workpieces, auxiliary tooling is used. The main problem with the tooling is that when the workpiece is clamped tightly by the cylinder, the deformation of the bracket housing is not considered. For the small planes on the end faces of these four claws, the flatness after shaping is still 0.1 - 0.15 mm. Although the small end faces of the claws are in contact with the upper plate plane of the fixture, it is because the rigidity of the bracket housing is relatively poor, and it is only after elastic deformation that it comes into contact with the upper plate of the fixture. After the cylinder is released after machining, the elastic deformation of the bracket housing recovers, causing the machined bracket-shaped workpiece to be out-of-tolerance, ultimately affecting the machining quality of the workpiece, and often resulting in the inability to meet production requirements due to out-of-tolerance workpiece dimensions, thus affecting production.

[0005] Therefore, it is necessary to develop a turning device for bracket-shaped die-castings to solve the above problems. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a turning device for bracket-shaped die-castings that reduces errors and improves accuracy.

[0007] To achieve the above purpose, the present utility model provides the following technical solution: A turning device for bracket-shaped die-castings, which includes:

[0008] A driving part;

[0009] An installation flange, which is docked with the driving part, and the driving part drives the installation flange to rotate;

[0010] A fixture, which is arranged on the installation flange. The fixture includes a clamping assembly and a positioning member. The driving part can drive the clamping assembly to press the main body part of the workpiece, and the positioning member extends into the workpiece and does not contact the upper and lower end faces of the workpiece.

[0011] Further, the bottom of the positioning member is fixedly connected to the mounting flange, and its top extends vertically upward into the workpiece.

[0012] Further, the diameter of the positioning member gradually decreases as the top of the positioning member extends vertically upward, and a positioning protrusion is formed at the end. The positioning protrusion is used to extend into a through hole of the workpiece.

[0013] Further, a chamfer is formed at the top of the positioning protrusion.

[0014] Further, the mounting flange includes a flange body. A cavity is formed by the inner depression of the lower surface of the flange body. A movable plate is installed in the cavity. A through hole is formed in the center of the movable plate. The through hole is used to connect the driving part.

[0015] Further, the movable plate is also provided with a connecting shaft. One end of the connecting shaft is fixedly connected to the movable plate, and the other end penetrates the flange body and extends to the outer surface of the flange body to drive the clamping assembly.

[0016] Further, the mounting flange further includes a locking part. The locking part is arranged at the center position of the mounting flange and is used to limit the radial movement of the workpiece.

[0017] Further, the clamping assembly includes a fixed rod fixed on the upper surface of the mounting flange, a movable rod located on one side of the fixed rod, and a pressing plate connecting the fixed rod and the movable rod. The movable rod is connected to the driving part.

[0018] Further, the driving part includes a rotatable main shaft and a chuck flange installed at the end of the main shaft. The mounting flange is fixedly connected to the chuck flange.

[0019] Further, the driving part further includes a rotary oil cylinder, a pull rod connecting the rotary oil cylinder, and a transmission part installed at the end of the pull rod. The pull rod penetrates through both ends of the main shaft. One end of the pull rod is connected to the rotary oil cylinder, and the other end is connected to the transmission part. The transmission part is movably connected to the fixture.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model is a turning device for bracket-type die-castings, which has the characteristics of reducing errors and improving precision. By driving the connecting shaft through the pull rod and the transmission part to pull the movable rod, one end of the pressing plate presses the workpiece tightly, restricting the axial movement of the workpiece. At the same time, the positioning protrusion extends into the through hole of the workpiece, positioning the workpiece without causing elastic deformation of the workpiece, and improving the machining precision of the workpiece. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the description of the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these drawings, where:

[0022] Figure 1 is a comparative diagram of the background technology;

[0023] Figure 2 is a three-dimensional structural schematic diagram of a turning device for a bracket-type die-casting part of the present utility model;

[0024] Figure 3 is Figure 2 a sectional structural schematic diagram of the turning device for the bracket-type die-casting part shown;

[0025] Figure 4 is Figure 2 an exploded structural schematic diagram of the mounting flange of the turning device for the bracket-type die-casting part shown;

[0026] Figure 5 is Figure 2 a structural schematic diagram of the mounting flange and fixture of the turning device for the bracket-type die-casting part shown;

[0027] Figure 6 is Figure 5 a sectional structural schematic diagram of the mounting flange and fixture of the turning device for the bracket-type die-casting part shown;

[0028] Figure 7 is Figure 6 a partial sectional structural schematic diagram of the mounting flange and fixture of the turning device for the bracket-type die-casting part shown.

[0029] In the figure: 1, driving part; 2, mounting flange; 3, fixture; 4, workpiece; 11, main shaft; 12, chuck flange; 13, rotary oil cylinder; 14, pull rod; 15, transmission part; 21, flange body; 22, cavity; 23, movable plate; 231, through hole; 232, connecting shaft; 233, mounting hole; 24, locking part; 31, clamping assembly; 32, positioning part; 311, fixed rod; 312, movable rod; 313, pressing plate; 33, positioning protrusion. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 2 to 7 , the present invention is a turning device for a bracket-type die-casting part, which includes a driving part 1, a mounting flange 2 connected to the driving part 1, and a fixture 3 mounted on the mounting flange 2.

[0032] Please refer to Figures 2 to 3 , the driving part 1 includes a rotatable main shaft 11 and a chuck flange 12 mounted at the end of the main shaft 11. The chuck flange 12 rotates synchronously with the main shaft 11, and the mounting flange 2 is fixedly connected to the chuck flange 12.

[0033] Please refer to Figures 2 to 3 , the driving part 1 further includes a rotary oil cylinder 13, a pull rod 14 connected to the rotary oil cylinder 13, and a transmission part 15 mounted at the end of the pull rod 14. The rotary oil cylinder 13 is arranged at one end of the main shaft 11, the transmission part 15 is arranged at the other end of the main shaft 11, the pull rod 14 penetrates through both ends of the main shaft 11, one end thereof is connected to the rotary oil cylinder 13, the other end is connected to the transmission part 15, the transmission part 15 is movably connected to the fixture 3, and the rotary oil cylinder 13 can generate a pulling force to clamp the workpiece by pulling the fixture 3 through the pull rod 14 and the transmission part 15.

[0034] Please refer to Figures 4 to 5 , the mounting flange 2 includes a flange body 21. The flange body 21 is recessed inward from its lower surface to form a cavity 22. A movable plate 23 is installed in the cavity 22. A through hole 231 is formed in the center of the movable plate 23 for connecting the transmission part 15. The movable plate 23 is further provided with a connecting shaft 232. One end of the connecting shaft 232 is fixedly connected to the movable plate 23, and the other end penetrates through the flange body 21 and extends to the outer surface of the flange body 21.

[0035] Preferably, the movable plate 23 has a plurality of mounting holes 233 that penetrate the upper and lower surfaces of the movable plate 23 for installing the connecting shaft 232, and the position of the connecting shaft 232 can be selected according to the shape of the workpiece.

[0036] The mounting flange 2 further includes a locking part 24, which is arranged at the central position of the mounting flange 2 to limit the radial movement of the workpiece, and the main shaft 11 drives the workpiece to rotate through the locking part 24.

[0037] Please refer to Figure 5, the fixture 3 includes a clamping assembly 31 and a positioning member 32 mounted on the flange body 21. The clamping assembly 31 includes a fixed rod 311 fixed on the upper surface of the flange body 21, a movable rod 312 located on one side of the fixed rod 311, and a pressing plate 313 connecting the fixed rod 311 and the movable rod 312. The bottom of the fixed rod 311 is fixedly connected to the upper surface of the flange body 21, and its top extends vertically upward and is movably connected to the pressing plate 313. The bottom of the movable rod 312 is movably connected to the connecting shaft 232, and its top is movably connected to the pressing plate 313. A part of the pressing plate 313 is movably connected to the fixed rod 311 and the movable rod 312, and the other part extends above the workpiece. The rotary oil cylinder 13 generates a pulling force, and drives the connecting shaft 232 to pull the movable rod 312 through the pull rod 14 and the transmission part 15, so that one end of the pressing plate 313 presses the workpiece tightly, restricting the axial movement of the workpiece.

[0038] Please refer to Figures 6 to 7 , the number of the positioning members 32 can be changed according to requirements. In this embodiment, the number of the positioning members 32 is four and they are arranged equidistantly centered on the center of the flange body 21. The bottom of the positioning member 32 is fixedly connected to the flange body 21, and its top extends vertically upward. Preferably, the diameter of the positioning member 32 gradually decreases as the top of the positioning member 32 extends vertically upward, and a positioning protrusion 33 is formed at the end. The positioning protrusion 33 is used to extend into the through hole of the workpiece. Further, neither the positioning member 32 nor the positioning protrusion 33 contacts the upper and lower end faces of the workpiece, and only extends into the through hole of the workpiece. There is a certain gap between the positioning protrusion 33 and the workpiece 4 to prevent the contact of the workpiece end face from affecting the positioning and causing elastic deformation of the workpiece. After releasing the pressure, the workpiece rebounds and deforms, affecting the final machining accuracy.

[0039] A chamfer is formed at the top of the positioning protrusion 33, which is beneficial to the installation of the workpiece.

[0040] When the turning device for a bracket-type die-casting part of the present utility model is in use, the workpiece is placed on the mounting flange 2, and the locking part 24 is used to restrict the radial movement of the workpiece. The main shaft 11 drives the workpiece to rotate through the locking part 24. The rotary oil cylinder 13 generates a pulling force, and drives the connecting shaft 232 to pull the movable rod 312 through the pull rod 14 and the transmission part 15, so that one end of the pressing plate 313 presses the workpiece tightly, restricting the axial movement of the workpiece. At the same time, the positioning protrusion 33 extends into the through hole of the workpiece.

[0041] The present utility model is a turning device for a bracket-type die-casting part, which has the characteristics of reducing errors and improving accuracy. By driving the connecting shaft to pull the movable rod through the pull rod and the transmission part, one end of the pressing plate presses the workpiece tightly, restricting the axial movement of the workpiece. At the same time, the positioning protrusion extends into the through hole of the workpiece, positioning the workpiece without causing elastic deformation of the workpiece, and improving the machining accuracy of the workpiece.

[0042] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. A turning device for a bracket type die casting, characterized in that: It includes: A driving unit (1); The mounting flange (2) is connected to the driving part (1), and the driving part (1) drives the mounting flange (2) to rotate; A clamp (3) is arranged on the mounting flange (2), and the clamp (3) comprises a clamping assembly (31) and a positioning member (32). The driving part (1) can drive the clamping assembly (31) to press the main part of the workpiece, and the positioning member (32) extends into the workpiece and does not contact the upper and lower end surfaces of the workpiece.

2. The turning device for bracket type die casting according to claim 1, characterized in that: The bottom of the positioning member (32) is fixedly connected to the mounting flange (2), and the top of the positioning member (32) extends vertically upward into the workpiece.

3. The turning device for bracket type die casting according to claim 2, characterized in that: The diameter of the positioning piece (32) gradually decreases as the top of the positioning piece (32) extends vertically upward, and a positioning protrusion (33) is formed at the end. The positioning protrusion (33) is used to extend into a through hole of a workpiece.

4. The turning device for bracket type die casting according to claim 3, characterized in that: The top of the positioning protrusion (33) is chamfered.

5. The turning device for bracket type die casting according to claim 1, characterized in that: The mounting flange (2) comprises a flange body (21), wherein the flange body (21) is recessed inward from its lower surface to form a cavity (22), a movable plate (23) is installed in the cavity (22), a through hole (231) is formed at the center of the movable plate (23), and the through hole (231) is used to connect the driving part (1).

6. The turning device for bracket type die casting according to claim 5, characterized in that: The movable plate (23) is further provided with a connecting shaft (232), one end of which is fixedly connected to the movable plate (23), and the other end of which passes through the flange body (21) and extends to the outer surface of the flange body (21) to drive the clamping assembly (31).

7. The turning device for bracket type die casting according to claim 1, characterized in that: The mounting flange (2) further comprises a locking portion (24), wherein the locking portion (24) is arranged at the center of the mounting flange (2) and is used to limit radial movement of a workpiece.

8. The turning device for bracket type die casting according to claim 1, characterized in that: The clamping assembly (31) comprises a fixed rod (311) fixed to the upper surface of the mounting flange (2), a movable rod (312) located on one side of the fixed rod (311), and a pressure plate (313) connecting the fixed rod (311) and the movable rod (312), wherein the movable rod (312) is connected to the driving part (1).

9. The turning device for bracket type die casting according to claim 1, characterized in that: The driving part (1) comprises a rotatable main shaft (11) and a chuck flange (12) mounted on the end of the main shaft (11), and the mounting flange (2) is fixedly connected to the chuck flange (12).

10. The turning device for bracket type die casting according to claim 9, characterized in that: The driving part (1) also includes a rotating cylinder (13), a pull rod (14) connected to the rotating cylinder (13), and a transmission part (15) installed at the end of the pull rod (14). The pull rod (14) passes through both ends of the main shaft (11), one end of which is connected to the rotating cylinder (13) and the other end is connected to the transmission part (15). The transmission part (15) is movably connected to the clamp (3).

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