Rolling flat dies

By employing a rolling flat die with differently inclined and lengthened cleavage portions on two dies, the concentrated rolling pressure is distributed, reducing wear and chipping and enhancing the durability of the dies.

JP7664746B2Active Publication Date: 2025-04-18OSG +1
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Patent Information

Application Number
JP2021069400
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-04-16
Publication Date
2025-04-18
Estimated Expiration
2041-04-16

AI Technical Summary

Technical Problem

The existing rolling flat dies concentrate the rolling pressure load in one place, leading to chipping and wear, which reduces the lifespan of the dies.

Method used

The rolling flat die is designed with a first die and a second die, each inclined to gradually increase in length from the starting end to the rear end in the rolling direction. The finishing part extends parallel to the rolling direction, and the lengths of the cleavage portions of the first and second dies are different, allowing the peak load to be distributed between the two dies during rolling.

Benefits of technology

This design effectively distributes the peak load applied to the rolling flat dies, preventing damage concentration and thereby slowing down wear and chipping, which improves the durability of the dies.

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Patent Text Reader

Abstract

To provide a rolling flat die which can disperse a rolling pressure load.SOLUTION: A rolling flat die 1 comprises a fixed side die 2 and a movable side die 3. The fixed side die 2 includes a chamfering part 21 and a finishing part 22. The movable side die 3 includes a chamfering part 31 and a finishing part 32. In the rolling flat die 1 equipped with such configuration, a chamfering length P1 of the fixed side die 2 and a chamfering length Q1 of the movable side die 3 are different from each other. Consequently, the rolling flat die 1 splits a load peak, which is applied to the rolling flat die 1 during rolling, into two, and can prevent damage from concentrating.SELECTED DRAWING: Figure 2
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Citation Information

Patent Citations

  • Thread rolling die

    CN212191061U

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    JP1984007451A

  • Form-rolling die

    JP2005288456A

  • Method for manufacturing double-threaded screw bolt

    JP2007229760A

  • Rolling die

    JP2017060970A