Hollowed-out riveting tool suitable for iron core

Abstract

The utility model provides a hollow riveting tool suitable for an iron core, which relates to the field of motor processing, and comprises an upper die which comprises a riveting unit, the lower end of the riveting unit is in the shape of an inverted circular truncated cone, the lower end of the riveting unit forms an upward concave accommodating cavity, and the accommodating cavity is used for accommodating an inner ring of the iron core; the containing cavity forms an abutting part on the riveting unit, the abutting part is used for abutting against the iron core, a plurality of avoiding grooves are formed in the circumferential direction of the abutting part, and the positions of the avoiding grooves correspond to the positions of riveting points of the iron core; the lower die is arranged below the upper die and used for fixing the iron core, the riveting unit used for abutting against the iron core is arranged to be in an inverted circular truncated cone shape, and the riveting unit is tightly attached to the inner ring of the iron core, so that the riveting unit acts on the edge of the inner ring, and the contact area between the riveting unit and the iron core is reduced; therefore, damage of the riveting unit to a coating layer on the iron core is reduced, and meanwhile, an avoiding groove is formed in the riveting unit, so that it is guaranteed that rivets are avoided in the riveting process, and the riveting effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of motor processing, and in particular to a hollow riveting fixture suitable for iron cores. Background Technology

[0002] Iron cores are commonly used components in motors. Currently, there is a research and development trend in iron core design to add slots and increase the area of ​​the coating layer. This makes it easy for traditional riveting processes to interfere with the coating layer and riveting points. This may not only damage the coating layer on the iron core, but also easily block the riveting points, affecting the riveting effect and quality. In order to optimize the existing riveting process, this application provides an optimized riveting fixture. Utility Model Content

[0003] This utility model provides a hollow riveting fixture suitable for iron cores. Its purpose is to change the position of the riveting unit acting on the iron core so as to avoid damage to the coating layer and to leave space for riveting of the rivets.

[0004] To achieve the above objectives, embodiments of this utility model provide a hollow riveting fixture suitable for iron cores, characterized in that it includes:

[0005] The upper mold includes a riveting unit. The lower end of the riveting unit is shaped like an inverted frustum. The lower end of the riveting unit forms an upwardly recessed receiving cavity for accommodating the inner ring of the iron core. The receiving cavity forms an abutment part on the riveting unit, which abuts against the iron core. The abutment part is provided with multiple clearance grooves in the circumferential direction, and the positions of the clearance grooves correspond to the riveting points of the iron core.

[0006] The lower mold is located below the upper mold and is used to fix the iron core.

[0007] Preferably, three clearance slots are provided, and the included angle between any two adjacent clearance slots is 120°.

[0008] Preferably, the upper mold further includes a connecting unit, which is disposed above the riveting unit and is used to drive the riveting unit to move in the vertical direction.

[0009] Preferably, the clearance groove is located above the riveting point of the iron core.

[0010] Preferably, the lower mold has a central boss at its center, and the central boss has a central through hole for accommodating the lower end of the inner ring of the iron core.

[0011] The above-mentioned solution of this utility model has the following beneficial effects:

[0012] In this application, the riveting unit used to abut against the iron core is set as an inverted frustum shape. The riveting unit is close to the inner ring of the iron core, so that the riveting unit acts on the edge of the inner ring, reducing the contact area between the riveting unit and the iron core, thereby reducing the damage to the coating layer on the iron core by the riveting unit. At the same time, the riveting unit is provided with a relief groove to ensure that the rivet is avoided during riveting and to ensure the riveting effect.

[0013] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the iron core structure;

[0015] Figure 2 This is a schematic diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the upper mold;

[0017] Figure 4 This is a cross-sectional view of the present invention in conjunction with the iron core;

[0018] Figure 5 yes Figure 4 Enlarged view of part A in the middle.

[0019] [Explanation of Labels in the Attached Image]

[0020] 10-Upper mold, 11-Riveting unit, 11a-Accommodation cavity, 11b-Abutting part, 11c-Allowing groove, 12-Connecting unit, 20-Lower mold, 21-Central boss, 22-Central through hole, 30-Iron core, 31-Inner ring, 32-Riveting point. Detailed Implementation

[0021] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0022] like Figure 1-5As shown, a hollow riveting fixture suitable for iron cores includes an upper mold 10 and a lower mold 20. The upper mold 10 is positioned above the lower mold 20, while the lower mold 20 remains stationary. The upper mold 10 can move vertically to move closer to or further away from the lower mold 20 to press against the iron core 30. Specifically, the upper mold 10 includes a riveting unit 11. The lower end of the riveting unit 11 is shaped like an inverted frustum, meaning the diameter of the lower end is smaller than the diameter of the upper end. A receiving cavity 11a is formed at the center of the lower surface of the riveting unit 11. This receiving cavity 11a is concave upwards and is used to accommodate the inner ring 31 of the iron core 30. Preferably, the diameter of the receiving cavity 11a is the same as the outer diameter of the inner ring 31 of the iron core 30. The receiving cavity 11a has an abutment portion 11b formed on the riveting unit 11, which abuts against the iron core 30. The abutment portion 11b has multiple clearance grooves 11c in the circumferential direction, and the positions of the clearance grooves 11c correspond to the positions of the riveting points 32 of the iron core 30. The lower mold 20 is used to fix the iron core 30 below the upper mold 10.

[0023] In this application, three clearance slots 11c are provided, and the included angle between any two adjacent clearance slots 11c is 120°.

[0024] The upper mold 10 also includes a connecting unit 12, which is disposed above the riveting unit 11. The connecting unit 12 and the riveting unit 11 are detachably or fixedly connected. The connecting unit 12 is used to connect to other linear motion equipment, thereby driving the connecting unit 12 to move in the vertical direction.

[0025] For the riveting point 32 of the iron core 30, the clearance groove 11c is set above the riveting point 32 of the iron core 30.

[0026] The aforementioned lower mold 20 has a central boss 21 at its center, and a central through hole 22 is provided through the central boss 21 along the vertical direction. The central through hole 22 is used to accommodate the lower end of the inner ring 31 of the iron core 30. Preferably, the diameter of the central through hole 22 is equal to the outer diameter of the inner ring 31 of the iron core 30.

[0027] When using this application, firstly, the coated iron core 30 is placed on the lower mold 20, ensuring that the inner ring 31 of the iron core 30 is inserted into the central through hole 22. The upper mold 10 abuts against the iron core 30 from above, ensuring that the inner ring 31 of the iron core 30 is located within the receiving cavity 11a. The iron core 30 is rotated vertically to ensure that the riveting point 32 of the iron core 30 is directly below the clearance groove 11c. After the iron core 30 is installed, it is riveted.

[0028] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A hollow riveting fixture suitable for iron cores, characterized in that, The utility model relates to a riveting device for the inner ring of a core of a motor, comprising: an upper die (10) comprising a riveting unit (11), the lower end of the riveting unit (11) being in the shape of an inverted circular truncated cone, the lower end of the riveting unit (11) forming an upwardly recessed accommodating cavity (11a) for accommodating the inner ring (31) of the core (30), the accommodating cavity (11a) forming an abutting portion (11b) on the riveting unit (11) for abutting against the core (30), the abutting portion (11b) being provided with a plurality of avoidance grooves (11c) in the circumferential direction, the avoidance grooves (11c) being located at positions corresponding to the riveting points (32) of the core (30); a lower die (20) arranged below the upper die (10), the lower die (20) being used for fixing the core (30).

2. The hollow riveting tool for the core according to claim 1, wherein: The avoidance grooves (11c) are three in number, and the included angle between any two adjacent avoidance grooves (11c) is 120°.

3. The hollow riveting tool for the core according to claim 1, wherein: The upper die (10) further comprises a connecting unit (12) arranged above the riveting unit (11), the connecting unit (12) being used for driving the riveting unit (11) to move in the vertical direction.

4. The hollow riveting tool for the core according to claim 1, wherein: The avoidance grooves (11c) are located above the riveting points (32) of the core (30).

5. The hollow riveting tool for the core according to claim 1, wherein: The center of the lower die (20) is provided with a center boss (21), the center boss (21) being provided with a center through hole (22) for accommodating the lower end of the inner ring (31) of the core (30).

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