A high-pressure torsion rotating mechanism

Abstract

The present invention discloses a high-pressure torsion rotary mechanism, comprising a variable-frequency motor, a reducer, an intermediate transmission system, and a high-pressure torsion die. The variable-frequency motor is connected to the reducer, amplifying torque through the reducer. The intermediate transmission system and the high-pressure torsion die are mounted above the reducer, with the reducer's output shaft, the intermediate transmission system, and the high-pressure torsion die coaxial. The reducer's output shaft is connected to the high-pressure torsion die via the intermediate transmission system, and the output shaft drives the high-pressure torsion die to rotate. This solution can provide the high torque required for high-pressure torsion while also enabling speed regulation.

Description

Technical Field

[0001] The invention relates to the field of plastic forming, and in particular to a high-pressure torsion rotating mechanism. Background Art

[0002] High-pressure torsion, a form of severe plastic deformation, can significantly refine the material's grain size, thereby improving its mechanical properties. The refined grain size can even reach submicron or nanometer levels. During high-pressure torsion, the upper die moves downward to provide axial pressure, while the lower die subsequently rotates, exerting a torque on the workpiece's cross-section through active friction. These two forces work together to achieve grain refinement. However, high-pressure torsion requires high torque, and the torsion speed is difficult to precisely control. Therefore, large workpieces cannot be produced, resulting in low production efficiency. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a high-torque rotating mechanism that can generate the high torque required for high-pressure torsion and has adjustable speed.

[0004] Technical solution: The present invention includes a variable frequency motor, a reducer, an intermediate transmission system and a high-pressure torsion mold; the variable frequency motor is connected to the reducer, and the torque is amplified by the reducer; the intermediate transmission system and the high-pressure torsion mold are installed above the reducer, and the output shaft of the reducer, the intermediate transmission system and the high-pressure torsion mold are coaxial; the output shaft of the reducer is connected to the high-pressure torsion mold through the intermediate transmission system, and the output shaft drives the high-pressure torsion mold to rotate.

[0005] The intermediate transmission system includes a coupling, a lower mold fixing seat, a rotating key and a lower mold base; the output shaft of the reducer is connected to the lower end of the lower mold fixing seat through a coupling; the upper end of the lower mold fixing seat is a stepped structure, with a groove for installing the rotating key, and the lower mold base is installed above the rotating key; the high-pressure torsion mold is installed on the top surface of the lower mold base; so that the lower mold base and the components above it can accept the torque directly transmitted by the output shaft of the reducer.

[0006] A bearing mounting seat is arranged outside the lower die fixing seat, and a circle of thrust spherical roller bearings is arranged between the bearing mounting seat and the lower die fixing seat; the spherical roller bearing is placed on the bearing mounting seat to bear axial force, and its upper part is close to the lower die fixing seat to reduce the friction resistance during the rotation process and facilitate maintaining the rotation speed.

[0007] A deep groove ball bearing is arranged between the inner wall of the bearing mounting seat and the lower die fixing seat to maintain the rotation speed.

[0008] A heat insulation board and a heat insulation board thickening layer are arranged between the lower mold fixing seat and the lower mold base, which have a heat insulation effect when the mold is heated.

[0009] The high-pressure torsion die includes a lower die installed on the top surface of the lower die base, an upper die spaced above the lower die, an upper punch installed on the upper die, and a lower punch installed on the lower die; a sample is placed between the upper punch and the lower punch to effectively prevent the sample from falling off during rotation.

[0010] A tensioning and fixing device is provided on the periphery of the sample. The tensioning and fixing device comprises an outer ring and an inner ring, which are interference fit. A gasket is provided under the inner ring. The tensioning and fixing device can limit the movement of the sample.

[0011] The reducer is a worm gear reducer, and a double key connection is adopted between the output shaft of the reducer and the reducer, which can provide a transmission ratio of 1:100 to obtain the required torque.

[0012] The high-pressure torsion die is detachable and is mounted on the lower die base during use, making assembly and disassembly easy.

[0013] Beneficial effects: Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0014] (1) Using a reducer with a large transmission ratio can amplify the output torque of the motor from 40N·m to more than 2000N·m;

[0015] (2) Using a frequency converter to change the frequency of the AC power supply to achieve variable speed of the motor, thereby changing the output torque of the motor and achieving torque control;

[0016] (3) The torque transmission sequence is: motor - reducer - reducer output shaft - coupling - lower die fixing seat. The lower die fixing seat is fixedly connected to the die part, that is, the number of transmission stages is small, the motor torque can be quickly transmitted to the die part, and the transmission efficiency is high;

[0017] (4) A block-shaped rotating key with a large cross-sectional area is used between the lower die fixing seat and the die part, which can transmit a large torque of more than 2000 N·m. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the present invention (with the high-pressure torsion die installed);

[0019] Figure 2 This is a schematic diagram of the structure of the present invention (without the high-pressure torsion die installed);

[0020] Figure 3 for Figure 2 Cross-sectional view along AA direction;

[0021] Figure 4 Schematic diagram of the structure of the high-pressure torsion die. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is described in detail below in conjunction with specific implementation methods and the accompanying drawings.

[0023] like Figure 1-3 As shown, the present invention includes a variable frequency motor 201, a reducer 202, an intermediate transmission system and a high-pressure torsion mold. The variable frequency motor 201 can adjust the speed, and the variable frequency motor 201 is connected to the reducer 202, and the torque is amplified by the reducer 202. The reducer 202 is a worm gear reducer, which can provide a transmission ratio of 1:100 to obtain the required torque. The output shaft 204 of the reducer 202 is connected to the reducer 202 by a double key. The high-pressure torsion mold is detachable and is installed on the lower mold base 216 when in use. The reducer mounting frame 203 is installed on the top surface of the reducer 202, the intermediate transmission system is installed above the reducer mounting frame 203, and the high-pressure torsion mold is installed above the intermediate transmission system. The reducer mounting frame 203 and the bearing mounting seat 210 together fix the entire mechanism on the workbench. The output shaft 204 of the reducer 202, the intermediate transmission system, and the high-pressure torsion mold are coaxial. The output shaft 204 of the reducer 202 is connected to the high-pressure torsion die through an intermediate transmission system, driving the high-pressure torsion die to rotate. Specifically, the intermediate transmission system includes a coupling 205, a bearing end cap 206, a deep-groove ball bearing 207, a bearing mount 210, a spherical roller bearing 211, a lower die holder 212, a rotation key 215, and a lower die base 216. The output shaft 204 of the reducer 202 is connected to the lower end of the lower die holder 212 via the coupling 205. The upper end of the lower die holder 212 has a stepped structure with a large end surface and a recessed groove for mounting the rotation key 215. The rotation key 215 and the recessed groove are threadedly fastened. A lower die base 216 is mounted above the rotation key 215 and connected to the lower die holder 212 via threaded fasteners. The high-pressure torsion die is mounted on the top surface of the lower die base 216. The bottom of the lower die base 216 also has a recessed groove that matches the rotation key 215. A heat shield 213 and a thickened heat shield layer 214 are provided between the lower mold fixing base 212 and the lower mold base 216. These heat shield 213 and thickened heat shield layer 214 are primarily used to insulate the mold when it is heated, and matching grooves are also provided within them. During installation, after the rotary key 215 is secured to the lower mold fixing base 212, the heat shield 213, thickened heat shield layer 214, and lower mold base 215 are sequentially superimposed on the lower mold fixing base 212 via the internal grooves. Finally, the lower mold base 216 and the lower mold fixing base 212 are screwed together, allowing the lower mold base 216 to receive the torque directly transmitted by the reducer output shaft 204.

[0024] A bearing mount 210 is mounted on the outer surface of the lower die holder 212. A thrust spherical roller bearing 211 is positioned between the bearing mount 210 and the lower die holder 212. The spherical roller bearing 211 is placed on the bearing mount 210 to withstand axial forces, with its upper portion in close contact with the lower die holder 212. A deep groove ball bearing 207 is positioned between the inner wall of the bearing mount 210 and the lower die holder 212. The bearing mount 210 can be fixed to a work surface. Two deep groove ball bearings 207 mounted within it maintain rotational speed and are separated by a bearing spacer 209. The lower die holder has an annular groove for a retaining ring 208, which is used to position the deep groove ball bearings 207. Finally, a bearing end cap 206 provides a dust-proof seal.

[0025] like Figure 3 and Figure 4 As shown, the high-pressure torsion die includes an upper die 221, a lower die 217, an upper punch 220, a lower punch 218, a gasket 222, a tensioning fixture, and a test specimen 219. The lower die 217 is mounted in a groove on the top surface of the lower die base 216. The upper die 221 is spaced apart above the lower die 217. The upper punch 220 is mounted on the upper die 221, and the lower punch 218 is mounted on the lower die 217. The upper die 221, lower die 217, upper punch 220, and lower punch 218 are coaxially arranged. The test specimen 219 is placed between the upper punch 220 and the lower punch 218. During installation, the lower die 217 is first mounted on the lower die base 216, and then the lower punch 220, gasket 222, tensioning fixture, test specimen 219, upper punch 220, and upper die 221 are placed in sequence. A tensioning fixture is provided on the periphery of the sample 219 . The tensioning fixture is composed of an outer ring 224 and an inner ring 223 that are mechanically interference fit to restrict the flow of the material. A gasket 222 is provided below the inner ring 223 .

[0026] The working process of the rotating mechanism for high-pressure torsion of the present invention is: select the torque and speed required for the work, adjust the frequency conversion motor 201 to the specified frequency, and the output shaft of the motor 201 is reduced in speed by the worm gear transmission inside the reducer 202 to drive the reducer output shaft 204 to rotate. The reducer output shaft 204 drives the lower mold fixing seat 212 and the lower mold base 216 fixed to the lower mold fixing seat 212 to rotate together through the coupling 205, thereby driving the mold part to achieve torsion.

Claims

1. A high-pressure torsion rotating mechanism, characterized in that: The invention comprises a variable frequency motor (201), a reducer (202), an intermediate transmission system and a high-pressure torsion die; the variable frequency motor (201) is connected to the reducer (202), and the torque is amplified by the reducer (202), and the reducer (202) amplifies the output torque of the variable frequency motor (201) to more than 2000 N·m; the intermediate transmission system and the high-pressure torsion die are installed above the reducer (202), and the output shaft (204) of the reducer (202), the intermediate transmission system and the high-pressure torsion die are coaxial; the output shaft (204) of the reducer (202) is connected to the high-pressure torsion die through the intermediate transmission system, and the output shaft (204) drives the high-pressure torsion die to rotate; The intermediate transmission system comprises a coupling (205), a lower die fixing seat (212), a rotation key (215) and a lower die base (216); the output shaft (204) of the reducer (202) is connected to the lower end of the lower die fixing seat (212) via the coupling (205); The upper end of the lower die fixing seat (212) is a stepped structure, and a groove for mounting a rotating key (215) is provided. The lower die base (216) is mounted above the rotating key (215), and the rotating key (215) is used to transmit a large torque of more than 2000 N·m. The high-pressure torsion die is mounted on the top surface of the lower die base (216).

2. The high-pressure torsion rotating mechanism according to claim 1, characterized in that: A bearing mounting seat (210) is provided on the outer surface of the lower die fixing seat (212), and a circle of thrust spherical roller bearings (211) is provided between the bearing mounting seat (210) and the lower die fixing seat (212); The spherical roller bearing (211) is placed on the bearing mounting seat (210) to bear the axial force, and the upper portion thereof is in close contact with the lower die fixing seat (212).

3. The high-pressure torsion rotating mechanism according to claim 2, characterized in that: A deep groove ball bearing (207) is provided between the inner wall of the bearing mounting seat (210) and the lower die fixing seat (212).

4. The high-pressure torsion rotating mechanism according to claim 1, characterized in that: A heat insulation board (213) and a heat insulation board thickening layer (214) are provided between the lower die fixing seat (212) and the lower die base (216).

5. The high-pressure torsion rotating mechanism according to claim 1, characterized in that: The high-pressure torsion die comprises a lower die (217) mounted on the top surface of a lower die base (216), an upper die (221) spaced apart above the lower die (217), an upper punch (220) mounted on the upper die (221), and a lower punch (218) mounted on the lower die (217); a sample (219) is placed between the upper punch (220) and the lower punch (218).

6. The high-pressure torsion rotating mechanism according to claim 5, characterized in that: A tensioning fixture is provided on the periphery of the sample (219), the tensioning fixture comprising an outer ring (224) and an inner ring (223), the two being interference fit, and a gasket (222) being provided below the inner ring (223).

7. The high-pressure torsion rotating mechanism according to claim 1, characterized in that: The reducer (202) is a worm gear reducer, and a double key connection is adopted between the output shaft (204) of the reducer (202) and the reducer (202).

8. The high-pressure torsion rotating mechanism according to claim 1, characterized in that: The high-pressure torsion die is detachable and is mounted on the lower die base (216) when in use.

Images