Backward extrusion device of motor shaft

Abstract

The utility model discloses a backward extrusion device of a motor shaft, which comprises an upper template and a lower template which are oppositely arranged up and down, the top surface of the lower template is fixedly connected with a lower die holder, the top surface of the lower die holder is provided with a forming core hole along the vertical direction, the bottom surface of the upper template is fixedly connected with a guide holder, and the guide holder is provided with a guide hole along the vertical direction in a penetrating manner. A forming mold core which is arranged on the same center line with the forming core hole is fixedly connected to the position, located on the inner side of the guide hole, of the bottom face of the upper mold plate, the bottom of the forming mold core extends downwards to form a forming core column, and the diameter of the forming core column is smaller than that of the forming mold core. The upper end of the lower die base can stretch into the guide hole and can be in sliding fit with the guide hole in the vertical direction, and the forming die core and the forming core column can stretch into the forming core hole to conduct extrusion forming on a to-be-machined shaft blank. According to the utility model, the blank with the shape close to that of a finished product can be processed, so that the material cost is reduced, and the subsequent processing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor shaft processing, and specifically to a reverse extrusion device for motor shafts. Background Technology

[0002] The motor shaft is a crucial component of a motor, serving as the link between the motor and the equipment for electromechanical energy conversion. It supports rotating parts, transmits torque, and determines the relative position of rotating parts with respect to the stator. One end of the motor shaft has an internal bore. In the conventional machining process, a rod-shaped blank is machined on both its outer circumference and the internal bore. The outer circumference can be machined directly on a lathe to remove excess material, and the internal bore is machined by drilling and boring to remove excess material. However, this machining process removes a significant amount of material from the blank. Although this material can be recycled, the overall material cost remains high. Furthermore, removing excess material takes more time, impacting overall machining efficiency.

[0003] Reverse extrusion is a metal processing technology that achieves complex structural forming through mold design and process optimization. Its core lies in utilizing the characteristics of the reverse extrusion process to make the material flow direction opposite to the movement of the punch, forming a hollow structure. This processing method allows for the production of blanks with shapes close to the finished product, which not only reduces material costs but also improves processing efficiency. Therefore, designing a reverse extrusion device capable of processing motor shaft blanks with a deep hole at one end while saving material processing costs requires further consideration. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a reverse extrusion device for motor shafts that can process motor shaft blanks with a deep hole structure at one end and save material processing costs.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A reverse extrusion device for a motor shaft includes an upper template and a lower template arranged opposite each other. A lower mold base is fixedly connected to the top surface of the lower template. A forming core hole is provided on the top surface of the lower mold base in the vertical direction. A guide seat is fixedly connected to the bottom surface of the upper template above the lower mold base. A guide hole is provided on the guide seat in the vertical direction. A forming core is fixedly connected to the bottom surface of the upper template inside the guide hole, with the forming core hole having the same center line as the forming core hole. A forming core column extends downward from the bottom of the forming core, with the forming core hole having the same center line as the forming core hole. The diameter of the forming core column is smaller than the diameter of the forming core. When the upper template moves downward, the upper end of the lower mold base can extend into the guide hole and slide in the guide hole in the vertical direction. Moreover, the forming core and the forming core column can extend into the forming core hole to extrude and form the shaft blank to be processed.

[0007] In this invention, the shaft blank is placed vertically in the forming core hole. Then, the upper mold plate is driven to move downwards, and the upper end of the lower mold base extends into the guide hole. The lower ends of the forming mold core and the forming core pillar also extend into the forming core hole, extruding the shaft blank. By restricting the forming core pillar, an inwardly extending inner hole is formed at one end of the shaft blank after extrusion. This reduces the amount of material removed during subsequent machining, thereby reducing material costs.

[0008] As an optimization, a lower limit seat is fixedly connected to the top surface of the lower template. A lower limit hole is provided in the lower limit seat along the vertical direction. A lower pad is placed on the top surface of the lower template inside the lower limit hole. The lower mold base includes multiple split modules that are stacked vertically and placed on the lower pad. The forming core hole is formed by the closing of split core holes that are provided on each split module and are aligned with the center line. A pressure block is fitted on the uppermost split module, which can slide and press against it in the vertical direction. The lower end of the pressure block extends into the lower limit hole and can slide and fit with the lower limit hole in the vertical direction. A lower pressure plate is fitted on the pressure block above the lower limit seat. The lower pressure plate and the lower limit seat are connected by a lower fastening bolt, which allows the lower pressure plate to press all the split modules onto the lower pad through the pressure block. Since the motor shaft is usually quite long, the overall size of the lower mold base is also large, making later storage troublesome. Therefore, a split structure can be designed to make reasonable use of space for storage.

[0009] As an optimization, adjacent modular units are positioned using a convex-concave mating relationship. This not only facilitates docking and positioning but also improves the accuracy of the formed core holes after docking.

[0010] As an optimization, the forming core hole is a through hole, and a top block with the same cross-sectional shape as the lower end of the forming core hole is provided at the lower opening of the forming core hole. The top block is placed on the lower template and can move vertically within the forming core hole. The lower template is provided with a push rod hole corresponding to the position of the forming core hole, which communicates with the forming core hole. A push rod extending vertically downward and passing through the push rod hole is provided on the bottom surface of the top block. After the shaft blank is extruded, it will adhere to the inner wall of the forming core hole to a certain extent. Therefore, the push rod can be used to push the top block upward, which facilitates demolding.

[0011] As an optimization, an upper limit seat is fixedly connected to the bottom surface of the upper template. An upper limit hole is provided in the upper limit seat along the vertical direction. An upper pad is placed on the bottom surface of the upper template inside the upper limit hole. The upper end of the guide seat extends into the upper limit hole and can slide with the upper limit hole in the vertical direction. The guide hole includes a mold base sliding hole provided at the bottom of the guide seat and a mold core through hole located at the bottom of the mold base sliding hole and arranged on the same center line. The guide seat is sleeved on the forming mold core through the mold core through hole and pressed onto the forming mold core, so that the upper end of the forming mold core abuts against the upper pad. The upper end of the lower mold base can extend into the mold base sliding hole and slide with the mold base sliding hole. An upper pressure plate is sleeved on the guide seat and pressed onto the guide seat below the upper limit seat. The upper pressure plate is connected to the upper limit seat by an upper fastening bolt and can make the upper pressure plate press the forming mold core onto the upper pad through the guide seat. Limiting the guide seat by the upper limit hole can improve the stability of the guide seat. At the same time, pressing the forming die core by the guide seat can also improve the stability of the forming die core during the extrusion process.

[0012] As an optimization, the molding core is provided with a core pillar mounting hole aligned with its center line. The molding core is fitted onto the molding core pillar through the core pillar mounting hole and can slide along the center line of the core pillar mounting hole. When the molding core is pressed onto the molding core pillar, the guide seat presses the molding core onto the upper pad, simultaneously pressing the upper end of the molding core pillar onto the upper pad. During long-term processing, the molding core pillar is prone to wear; using the same press-fit method, the molding core pillar can be easily disassembled and replaced.

[0013] As an optimization, a vent hole communicating with the outside of the guide seat is provided on the wall of the sliding hole of the mold base near the bottom of the sliding hole. When the upper end of the upper mold base extends into the sliding hole of the mold base, the air inside the sliding hole cannot be smoothly discharged, which will hinder the further sliding of the upper mold base. The vent hole allows the internal air to be discharged smoothly, improving the smoothness of the sliding of the upper mold base.

[0014] As an optimization, a vertically downward extending guide tube is fixedly connected to the bottom surface of the upper template, and a guide post arranged along the same center line as the guide tube is fixedly connected to the top surface of the lower template. The upper end of the guide post extends into the inner hole of the guide tube and can slide with the guide tube in a vertical direction. This provides guidance for the movement of the upper template.

[0015] Compared with existing technologies, this invention can process blanks with shapes that are close to the finished product shape, which not only helps to reduce material costs but also improves subsequent processing efficiency. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0018] like Figure 1 As shown, the reverse extrusion device for the motor shaft in this embodiment includes an upper template 1 and a lower template 2 arranged opposite each other. A lower mold base is fixedly connected to the top surface of the lower template 2. A forming core hole is provided on the top surface of the lower mold base in the vertical direction. A guide seat 3 is fixedly connected to the bottom surface of the upper template 1 and above the lower mold base. A guide hole is provided on the guide seat 3 in the vertical direction. A forming core 4 is fixedly connected to the bottom surface of the upper template 1 and inside the guide hole, with the same center line as the forming core hole. A forming core column 5 extends downward from the bottom of the forming core 4 and is arranged with the same center line as the forming core hole. The diameter of the forming core column 5 is smaller than the diameter of the forming core 4. When the upper template 1 moves downward, the upper end of the lower mold base can extend into the guide hole and slide in the guide hole in the vertical direction. Moreover, the forming core 4 and the forming core column 5 can extend into the forming core hole to extrude and form the shaft blank to be processed.

[0019] In this specific embodiment, a lower limit seat 6 is fixedly connected to the top surface of the lower template 2. A lower limit hole is provided on the lower limit seat 6 along the vertical direction. A lower pad 7 is placed on the top surface of the lower template 2 and inside the lower limit hole. The lower mold base includes multiple split modules 8 that are stacked vertically and placed on the lower pad 7. The forming core hole is formed by the closing of split core holes that are provided on each split module 8 and are arranged along the center line. A pressure block 9 is sleeved on the uppermost split module 8 and can slide and press against it along the vertical direction. The lower end of the pressure block 9 extends into the lower limit hole and can slide and cooperate with the lower limit hole along the vertical direction. A lower pressure plate 10 is sleeved on the pressure block 9 and above the lower limit seat 6 and pressed against it. The lower pressure plate 10 and the lower limit seat 6 are connected by a lower fastening bolt and can press all the split modules 8 onto the lower pad 7 through the pressure block 9.

[0020] In this specific embodiment, the two adjacent sub-modules 8 are positioned by a concave-convex fit relationship.

[0021] In this specific embodiment, the forming core hole is a through hole, and a top block 11 with the same cross-sectional shape as the lower end of the forming core hole is provided at the lower end of the forming core hole. The top block 11 is placed on the lower template 2 and can move vertically within the forming core hole. The lower template 2 is provided with a top rod hole that communicates with the forming core hole in the vertical direction corresponding to the position of the forming core hole. A top rod 12 extending vertically downward and passing through the top rod hole is provided on the bottom surface of the top block 11.

[0022] In this specific embodiment, an upper limit seat 13 is fixedly connected to the bottom surface of the upper template 1. An upper limit hole is provided on the upper limit seat 13 in the vertical direction. An upper pad 14 is placed on the bottom surface of the upper template 1 at a position inside the upper limit hole. The upper end of the guide seat 3 extends into the upper limit hole and can slide with the upper limit hole in the vertical direction. The guide hole includes a mold base sliding hole provided at the bottom of the guide seat 3 and a mold core through hole located at the bottom of the mold base sliding hole and arranged on the same center line. The guide seat 3 passes through the mold core through hole. The mold core 4 is sleeved on and pressed onto the mold core 4, so that the upper end of the mold core 4 abuts against the upper pad 14. The upper end of the lower mold base can extend into the sliding hole of the mold base and slide with the sliding hole of the mold base. The upper pressure plate 15 is sleeved on the guide seat 3 and located below the upper limit seat 13 and pressed onto the guide seat 3. The upper pressure plate 15 and the upper limit seat 13 are connected by upper fastening bolts, so that the upper pressure plate 15 can press the mold core 4 onto the upper pad 14 through the guide seat 3.

[0023] In this specific embodiment, the molding core 4 is provided with a core column mounting hole arranged along the same center line. The molding core 4 is fitted onto the molding core 5 through the core column mounting hole and can slide with the molding core 5 along the center line direction of the core column mounting hole. The molding core 4 is pressed onto the molding core 5 so that when the guide seat 3 presses the molding core 4 onto the upper pad 14, it can simultaneously press the upper end of the molding core 5 onto the upper pad 14.

[0024] In this specific embodiment, a vent hole 16 communicating with the outside of the guide seat 3 is provided on the hole wall of the mold base sliding hole and near the bottom of the mold base sliding hole.

[0025] In this specific embodiment, a guide tube 17 extending vertically downward is fixedly connected to the bottom surface of the upper template 1, and a guide post 18 arranged with the same center line as the guide tube 17 is fixedly connected to the top surface of the lower template 2. The upper end of the guide post 18 extends into the inner hole of the guide tube 17 and can slide and cooperate with the guide tube 17 in the vertical direction.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. An apparatus for back extrusion of a motor shaft, comprising an upper die plate and a lower die plate arranged oppositely, characterized in that: A lower mold base is fixedly connected to the top surface of the lower mold base. A forming core hole is provided on the top surface of the lower mold base in the vertical direction. A guide seat is fixedly connected to the bottom surface of the upper mold base above the lower mold base. A guide hole is provided on the guide seat in the vertical direction. A forming mold core is fixedly connected to the bottom surface of the upper mold base inside the guide hole, with the forming core hole having the same center line as the forming core hole. A forming core column extends downward from the bottom of the forming mold core, with the forming core hole having the same center line as the forming core hole. The diameter of the forming core column is smaller than the diameter of the forming mold core. When the upper mold base moves downward, the upper end of the lower mold base can extend into the guide hole and slide in the guide hole in the vertical direction. Moreover, the forming mold core and the forming core column can extend into the forming core hole to extrude and form the shaft blank to be processed.

2. A counter extrusion device for an electric machine shaft according to claim 1, characterized in that: A lower limit seat is fixedly connected to the top surface of the lower template. A lower limit hole is provided in the lower limit seat along the vertical direction. A lower pad is placed on the top surface of the lower template inside the lower limit hole. The lower mold base includes multiple split modules that are stacked vertically and placed on the lower pad. The forming core hole is formed by the closing of split core holes that are provided on each split module and are aligned with the center line. A pressure block is fitted on the uppermost split module, which can slide and press against it in the vertical direction. The lower end of the pressure block extends into the lower limit hole and can slide and fit with the lower limit hole in the vertical direction. A lower pressure plate is fitted on the pressure block above the lower limit seat. The lower pressure plate and the lower limit seat are connected by a lower fastening bolt, which allows the lower pressure plate to press all the split modules onto the lower pad through the pressure block.

3. The anti-extrusion device for the motor shaft according to claim 2, characterized in that: The two adjacent sub-modules are positioned using a concave-convex fit relationship.

4. The reverse extrusion apparatus of the motor shaft according to claim 1, characterized by: The forming core hole is a through hole. A top block with the same cross-sectional shape as the lower end of the forming core hole is provided at the lower end of the forming core hole. The top block is placed on the lower template and can move vertically within the forming core hole. The lower template is provided with a top rod hole that communicates with the forming core hole in the vertical direction at the position corresponding to the forming core hole. A top rod extending vertically downward and passing through the top rod hole is provided on the bottom surface of the top block.

5. The reverse extrusion apparatus of the motor shaft according to claim 1, characterized by: An upper limit seat is fixedly connected to the bottom surface of the upper template. An upper limit hole is provided in the upper limit seat along the vertical direction. An upper pad is placed on the bottom surface of the upper template inside the upper limit hole. The upper end of the guide seat extends into the upper limit hole and can slide with the upper limit hole in the vertical direction. The guide hole includes a mold base sliding hole provided at the bottom of the guide seat and a mold core through hole located at the bottom of the mold base sliding hole and arranged on the same center line. The guide seat is sleeved on the forming mold core through the mold core through hole and pressed on the forming mold core, so that the upper end of the forming mold core abuts against the upper pad. The upper end of the lower mold base can extend into the mold base sliding hole and slide with the mold base sliding hole. An upper pressure plate is sleeved on the guide seat and pressed on the guide seat below the upper limit seat. The upper pressure plate and the upper limit seat are connected by upper fastening bolts, so that the upper pressure plate can press the forming mold core onto the upper pad through the guide seat.

6. The anti-extrusion device for the motor shaft according to claim 5, characterized in that: The molding core is provided with a core column mounting hole with the same center line as it. The molding core is fitted onto the molding core column through the core column mounting hole and can slide with the molding core column along the center line of the core column mounting hole. When the molding core is pressed onto the molding core column, the guide seat can press the upper end of the molding core column onto the upper pad at the same time.

7. A reverse extrusion apparatus for a motor shaft according to claim 5, wherein: A vent hole communicating with the outside of the guide seat is provided on the wall of the sliding hole of the mold base near the bottom of the sliding hole.

8. The anti-extrusion device for the motor shaft according to claim 1, characterized in that: A guide tube extending vertically downwards is fixedly connected to the bottom surface of the upper template, and a guide post arranged along the same center line as the guide tube is fixedly connected to the top surface of the lower template. The upper end of the guide post extends into the inner hole of the guide tube and can slide and cooperate with the guide tube in the vertical direction.

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