High-precision shaft hole punching die for sheet metal part

Abstract

The invention discloses a high-precision shaft hole punching die for a sheet metal part. The high-precision shaft hole punching die comprises an upper convex die, a discharging plate elastically configured with the upper convex die and a lower concave die. The high-precision shaft hole punching die is mainly characterized in that a compacting plate used for compacting a processed workpiece is arranged on the working surface of the discharging plate; under working conditions, the processed workpiece is subjected to shaft hole punching under the condition that the compacting plate is compacted with a lower concave die surface and a surface. The high-precision shaft hole punching die disclosed by the invention has the characteristics of being reasonable in technical scheme, simple in structure, high in shaft hole punching precision and the like and particularly suitable for the production of punching shaft holes of motor laminated stators.

Description

technical field [0001] The invention relates to a high-precision shaft hole punching die for sheet metal parts, in particular to a high-precision shaft hole punching metal die for metal sheet parts, which belongs to the technology of sheet metal forming dies. Background technique [0002] In the prior art, the punching die for the shaft hole of the sheet metal part, especially the shaft hole of the sheet metal part with a diameter > φ10mm, under its working condition, exists between the unloading plate and the working surface of the lower die (micro-clearance fit) The processed sheet metal workpieces are generally in a non-compacted free state, and at the moment when the processed sheet metal workpiece is punched by the shaft hole punch, the metal sheet suffered during the rolling process of the sheet metal The destruction of the formed "strip-like structure" inevitably produces expansion or contraction deformation of the shaft hole of the processed sheet metal workpiece,...

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Problems solved by technology

[0004] However, although this method of "remedial work" can overcome the negative impact caused by the deficiencies of the prior art as a whole, the laminated stator is composed of numerous thin steel single pieces that are laminated by riveting or bonding Composed, and because the deformation and variable size of each of the thin steel single-piece shaft holes that are not strictly controlled during the punching process of the die cannot be consistent, this defect cannot be passed through the subsequent grinding process. Machining to overcome, so that the lamination rotor of the motor and the local shaft holes of the lamination stator have a problem of inconsistent size, which directly affects the quality of the motor

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