Mandrel withdrawing device for forging forming of inner hole profile

Abstract

The invention discloses a mandrel withdrawing device for forging forming of an inner hole profile. The mandrel withdrawing device for forging forming of the inner hole profile comprises a machine body and a fixed plate connected with the machine body. A hydraulic cylinder is fixedly connected with the machine body. A punch of the hydraulic cylinder is connected with the left end of a pull ring. The two sides of the pull ring slide on pull ring supports. The right end of the pull ring is connected with one end of a mandrel through a flexible connector. The mandrel is sleeved with a workpiece. The workpiece is positioned through a workpiece supporting frame. The left end of the workpiece is abutted against an end blocking plate. The right end of the workpiece is connected with an oil cavity. A vibration exciter is arranged beside the middle of the workpiece and connected to a sliding block. The sliding block is matched with a guide rail. The end blocking plate, the workpiece supporting frame and the guide rail are fixed to the fixed plate. The vibration exciter makes the workpiece resonate, the contact surface of the workpiece and the mandrel becomes loose so that the mandrel can be withdrawn conveniently, and the mandrel can be withdrawn more easily under the action of high-pressure oil; pulling force which is large enough can be provided by the hydraulic cylinder, and thus the mandrel can be withdrawn even if the mandrel is clamped quite tightly; damage to the workpiece and the mandrel is small in the mandrel withdrawing process.

Description

technical field [0001] The invention belongs to the technical field of forging with a mandrel, and in particular relates to a mandrel extraction device for forging an inner hole profile. Background technique [0002] In forging, in order to manufacture the inner hole profile with high precision, a mandrel is usually used to assist in forming. During the forging process, the metal flows violently in the radial direction, thereby tightly hugging the mandrel, so it is often difficult to pull out the mandrel after forging. [0003] The traditional method of extracting the mandrel is simple mechanical impact extraction, but this method has four obvious defects: first, if the metal hugs the mandrel too tightly, it will not be able to be extracted; second, mechanical impact extraction is easy to damage The inner surface of the workpiece is damaged; third, the efficiency is low; fourth, in order to avoid the situation that the mandrel cannot be pulled out, the designed forging volu...

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Problems solved by technology

[0003] The traditional method of extracting the mandrel is simple mechanical impact extraction, but this method has four obvious defects: first, if the metal hugs the mandrel too tightly, it will not be able to be extracted; second, mechanical impact extraction is easy to damage The inner surface of the workpiece is damaged; third, the efficiency is low; fourth, in order to avoid the situation that the mandrel cannot be pulled out, the designed forging volume must be small, which also limits the scope of use of the rotary forging process to a large extent

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