A punching tool for a generator claw pole

Abstract

This utility model relates to the field of punch press tooling technology, and in particular to a punching tooling for generator claw poles. It includes a die for punching claw poles on a punch press and a fixture for positioning the claw poles on the die. The fixture includes a positioning seat and a positioning ring sleeved outside the positioning seat. The positioning seat includes a circular seat body and a limiting frustum located at the bottom of the seat body. A positioning frustum coaxial with the positioning frustum is provided inside the seat body. A magnetic yoke groove is provided on the end face of the positioning frustum. A first chip removal through hole coaxial with the positioning frustum is provided at the bottom of the magnetic yoke groove. An annular groove for placing the claw pole is formed between the outer circumferential surface of the positioning frustum and the inner wall of the seat body. A stepped surface is provided on the outer circumferential surface of the seat body, and a protruding ring pressing against the stepped surface is provided on the inner wall of the positioning ring. The beneficial effects of this utility model are: rapid positioning of the claw poles and ensuring punching accuracy.

Description

Technical Field

[0001] This utility model relates to the field of punching tooling technology, specifically a punching tooling for generator claw poles. Background Technology

[0002] As a core component of the generator rotor, the claw pole's primary function is to generate a magnetic field during generator operation. Therefore, the machining accuracy and process rationality of the claw pole directly affect the overall performance of the generator. In the conventional machining process of the claw pole, a through hole needs to be machined at its center to meet assembly requirements. Existing machining processes typically include the following steps in sequence: blanking, heating, forging, trimming, annealing, shot blasting, shaping, drilling, and finishing. Among these, the through hole machining step commonly uses a drilling machine. However, this method has the following drawbacks in actual production: 1. Drilling must be performed after the forging has cooled to room temperature. At room temperature, the hardness of the forging increases significantly, increasing drill bit wear and potentially leading to deviations in the through hole's dimensional accuracy, thus increasing machining difficulty; 2. Drilling generates a large amount of iron filings, which easily adhere to the claw pole surface or remain at the machining station, increasing the workload of subsequent cleaning and potentially affecting the quality of subsequent finishing processes due to iron filings residue.

[0003] To address the above shortcomings, the applicant proposes an optimization solution: after the claw pole forging process is completed, taking advantage of the forging's still high temperature and high material plasticity, it can be directly punched. Therefore, a punching fixture suitable for generator claw poles needs to be developed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a punching fixture for generator claw poles, which can quickly position the claw poles and ensure punching accuracy, in order to address the shortcomings of the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a punching fixture for a generator claw pole, comprising a die for punching the claw pole on a punch press and a fixture for positioning the claw pole on the die. The fixture includes a positioning seat and a positioning ring sleeved outside the positioning seat. The positioning seat includes a circular seat body and a limiting frustum disposed at the bottom of the seat body. The seat body has a positioning frustum coaxial with it. The end face of the positioning frustum has a magnetic yoke groove. The bottom of the magnetic yoke groove has a first chip removal through hole coaxial with the positioning frustum. An annular groove for placing the claw pole is formed between the outer peripheral surface of the positioning frustum and the inner wall of the seat body. The outer peripheral surface of the seat body has a stepped surface. The inner wall of the positioning ring has a protruding ring pressing against the stepped surface.

[0006] The present invention, which has the above-mentioned features, has the following: a magnetic yoke groove is provided on the positioning circular platform to fit with the magnetic yoke part of the claw pole, and the claw is placed in the annular groove in the seat body. This fixture structure can realize the rapid positioning of the claw pole and ensure the accuracy of each punching. Waste generated during punching is discharged from the fixture through the first chip removal through hole, keeping the work station clean. A positioning ring is provided to fix the positioning seat, and this fixing structure facilitates assembly.

[0007] The present invention is further configured as follows: the mold includes an upper template and a lower template; the upper template has two large guide sleeves on the same side; the lower template has a large guide post corresponding to the large guide sleeves; the upper template has a punch at its center; the positioning seat is coaxially arranged with the punch; the lower template has a limiting groove for embedding a limiting frustum; the lower template also has a second chip removal through hole coaxial with the first chip removal through hole; and the positioning ring is connected to the lower template by fasteners.

[0008] The present invention, possessing the above-mentioned features, features the following: the large guide sleeve and the large guide post work together to prevent punch deviation and improve punching accuracy; by setting a limiting groove on the lower template, the positioning seat can be quickly positioned on the lower template, while also preventing the positioning seat from shifting due to the impact force of punching; the second chip removal through hole set on the lower template forms a continuous chip removal channel with the first chip removal through hole, solving the problem of waste accumulation; the positioning ring and the lower template are connected by fasteners, which facilitates disassembly and assembly, and improves replacement efficiency when changing the size of the fixture.

[0009] A further feature of this invention is that the mold also includes a middle template, on which two sets of symmetrical small guide sleeves are provided, and on which corresponding small guide posts are provided on the lower template to match the small guide sleeves, and buffer springs are provided on the outer sleeves of the small guide posts.

[0010] The present invention, which has the above-mentioned features, has the following characteristics: during punching, the compression of the buffer spring generates a buffering force, which can prevent the punch from acting directly on the claw pole with a rigid impact force.

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the installation of this utility model on a punch press.

[0013] Figure 2 This is a schematic diagram of the fixture in an embodiment of the present invention.

[0014] Figure 3 This is a schematic diagram of the positioning seat in an embodiment of the present invention.

[0015] Figure 4 This is a schematic diagram of the positioning ring in an embodiment of the present invention.

[0016] Figure 5 This is an exploded view of the fixture and lower template in an embodiment of this utility model.

[0017] Figure 6 This is a cross-sectional view of the clamp and lower template in an embodiment of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings: like Figure 1-6 The punching fixture for a generator claw pole shown includes a die for punching the claw pole on a punch press and a fixture for positioning the claw pole on the die. The fixture includes a positioning seat 1 and a positioning ring 2 sleeved on the positioning seat 1. The positioning seat 1 includes a circular seat body 11 and a limiting frustum 12 set at the bottom of the seat body 11. A positioning frustum 13 coaxial with the seat body 11 is provided inside the seat body 11. A magnetic yoke groove 131 is provided on the end face of the positioning frustum 13. A first chip removal through hole 14 coaxial with the positioning frustum 13 is provided at the bottom of the magnetic yoke groove 131. An annular groove 15 for placing the claw pole is formed between the outer peripheral surface of the positioning frustum 13 and the inner wall of the seat body 11. A stepped surface 111 is provided on the outer peripheral surface of the seat body 11. A protruding ring 21 pressing on the stepped surface 111 is provided on the inner wall of the positioning ring 2.

[0019] The mold includes an upper template 3 and a lower template 4. The upper template 3 has two large guide sleeves 5 on the same side. The lower template 4 has a large guide post 6 that matches the large guide sleeves 5. The upper template 3 has a punch 16 at its center. The positioning seat 1 is coaxially arranged with the punch 16. The lower template 4 has a limiting groove 41 for the limiting frustum 12 to be embedded. The lower template 4 also has a second chip removal through hole 42 that is coaxial with the first chip removal through hole 14. The positioning ring 2 is connected to the lower template 4 by fasteners, preferably screws, bolts, etc.

[0020] The mold also includes a middle template 7, on which two sets of symmetrical small guide sleeves 8 are provided. The lower template 4 is provided with corresponding small guide pillars 9 that match the small guide sleeves 8. The small guide pillars 9 are covered with buffer springs 10.

[0021] During punching, the magnetic yoke of the claw pole is placed into the magnetic yoke groove of the positioning seat, and the claw of the claw pole is placed into the annular groove. The upper die drives the punch downward, and the upper template drives the middle template downward, and the punch punches the claw pole.

Claims

1. A punching tool for a generator claw pole, characterized by: The device includes a die for punching claw poles on a punch press and a fixture for positioning the claw poles on the die. The fixture includes a positioning seat and a positioning ring sleeved on the positioning seat. The positioning seat includes a circular seat body and a limiting frustum located at the bottom of the seat body. The positioning frustum is coaxial with the seat body. The end face of the positioning frustum is provided with a magnetic yoke groove. The bottom of the magnetic yoke groove is provided with a first chip removal through hole coaxial with the positioning frustum. An annular groove for placing the claw poles is formed between the outer peripheral surface of the positioning frustum and the inner wall of the seat body. The outer peripheral surface of the seat body is provided with a stepped surface. The inner wall of the positioning ring is provided with a protruding ring pressing against the stepped surface.

2. The punching fixture for a generator claw pole according to claim 1, characterized in that: The mold includes an upper template and a lower template. The upper template has two large guide sleeves on the same side. The lower template has a large guide post that matches the large guide sleeves. The upper template has a punch at its center. The positioning seat is coaxial with the punch. The lower template has a limiting groove for embedding a limiting frustum. The lower template also has a second chip removal through hole that is coaxial with the first chip removal through hole. The positioning ring is connected to the lower template by fasteners.

3. A punching tool for generator claw poles according to claim 2, characterized in that: The mold also includes a middle template, on which two sets of symmetrical small guide sleeves are provided. The lower template is provided with corresponding small guide posts that match the small guide sleeves, and the small guide posts are fitted with buffer springs.

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