CN-122007314-A - Continuous local progressive loading precision forming die and method for frame with ribs

CN122007314ACN 122007314 ACN122007314 ACN 122007314ACN-122007314-A

Abstract

A continuous local progressive loading precision forming die and method for an ultra-long Y-shaped ribbed frame part comprises a fixed female die, a movable female die, a front blank pressing die, a male die, a rear blank pressing die and a lower die plate, wherein the fixed female die and the movable female die are horizontally arranged oppositely, the front blank pressing die, the male die and the rear blank pressing die are arranged on the fixed female die, and the lower die plate is arranged under the movable female die, wherein blanks are input from one side of the fixed female die and one side of the movable female die, and are continuously output from the other side of the fixed female die and the movable female die. The invention can obviously reduce the forming load of the component, improve the material utilization rate, reduce the manufacturing cost and the size of the whole die, and realize the effective forming of the ultra-long Y-shaped frame body with the ribs.

Inventors

ZHUANG XINCUN
WANG YONGSHAN
SUN XIAOFENG
SUN XIAOLONG
ZHANG WEN
HUANG ZHIBIN
XIANG HUA
ZHAO ZHEN
CHEN JIAWEI

Assignees

上海交通大学
上海飞机制造有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The continuous local progressive loading precision forming die for the ultra-long Y-shaped ribbed frame piece is characterized by comprising a fixed female die, a movable female die, a front blank pressing die, a male die, a rear blank pressing die and a lower die plate, wherein the fixed female die and the movable female die are horizontally arranged oppositely; A top rod which moves up and down is arranged in the lower template, and the upper end of the top rod is contacted with the movable female die; The input sides of the fixed die and the movable die are provided with heating devices for preheating blanks.
2. The continuous and partial progressive loading precision forming die for the ultra-long Y-shaped ribbed frame member according to claim 1, wherein the front blank holder and the rear blank holder are respectively driven to press down by a front oil cylinder and a rear oil cylinder which are arranged on the upper die plate.
3. The continuous and partial progressive loading precision forming die for the ultra-long Y-shaped ribbed frame member according to claim 1, wherein the blank is provided with a feeding device for realizing horizontal movement of the blank and preventing the blank from being convexly pressed to web reinforcing ribs of the Y-shaped ribbed frame member.
4. The continuous and partial progressive loading precise forming die for the ultra-long Y-shaped ribbed frame member, which is disclosed in claim 1, is characterized in that the lower die plate is of a U-shaped groove structure, a T-shaped groove structure is arranged on the inner wall of one side of the U-shaped groove, a groove structure is arranged on the inner wall of the other side of the U-shaped groove, three vertical through holes are formed in the side, close to the T-shaped groove, of the bottom of the U-shaped groove structure, a T-shaped boss structure is formed in one side of the corresponding movable die, a boss structure is formed in the other side of the corresponding movable die, and a characteristic surface structure is formed in the other side of the corresponding fixed die.
5. A continuous partial progressive loading precision forming method of a mold according to any one of claims 1-4, comprising: Step one, installing a die; Heating the upper die plate and the lower die plate by using heating pipes, and monitoring the temperatures of the male die and the movable female die by using corresponding temperature sensors; step three, a feeding device pushes the blank to be slowly conveyed below the male die through a heating device, and the blank is quickly preheated to be near the target forming temperature when passing through the heating device; starting the press, and running the upper die plate downwards until the front blank pressing die contacts with the blank; the blank is not arranged below the rear blank holder, the rear blank holder is not contacted with the blank at the moment, the press continues to move down until the male die is contacted with the blank, the front oil cylinder is pushed back in the process, the front blank holder continuously outputs blank holder force to the blank, the press moves down again, the male die locally loads the blank to finish the first step of forming of the blank, the front oil cylinder continuously pushes back in the process, the front blank holder continuously outputs blank holder force, and the blank below the male die is in a closed die state in the die due to the complex section shape of the Y-shaped ribbed frame body, particularly the contact part of the ribs at the lower part of a forming member and the movable female die; Step five, returning the press, namely ejecting a front oil cylinder in the process, starting the press reversely, and ejecting the movable female die upwards for a small distance to achieve the demoulding effect of the forge piece; Step six, after feeding is finished, the counter-jacking force of the press is removed, the movable female die slides downwards to an initial position, the press descends, if the movable female die is not reset in the process, a front oil cylinder and a rear oil cylinder can apply pressure to the movable female die to ensure that the movable female die is reset, after the movable female die is reset, the front blank holder contacts with a blank through the descending effect of the press, meanwhile, the rear blank holder contacts with a formed area, the press continues to descend until the male die contacts with the blank, the front oil cylinder and the rear oil cylinder continuously jack back in the process, the front blank holder and the rear blank holder respectively apply blank pressing force to an undeformed area and a deformed area, the press continues to descend, and the male die locally loads the blank to deform the material, so that the second work step of forming is completed; And step seven, repeating the step five and the step six until all ribs of the ultra-long Y-shaped ribbed frame body part are formed.
6. The continuous partial progressive loading precision forming method of claim 4, wherein in the second and third steps, the heating temperature of the mold and the blank is 200-950 ℃.
7. The continuous partial progressive loading precision forming method according to claim 4, wherein in the fourth to seventh steps, the descending speed of the press is 0.2 to 10mm/s.
8. The continuous, localized progressive loading precision forming method of claim 4, wherein when the ribs Gao Houbi are less than 3, a one-pass forming method is adopted, when the rib height-thickness ratio is between 3 and 10, a two-pass forming method is adopted, when the rib height-thickness ratio is between 10 and 20, a three-pass forming method is adopted, and in order to reduce the tendency of material to flow transversely, the deformation of the previous pass is slightly less than the deformation of the next pass.
9. The continuous partial progressive loading precision forming method of claim 4, wherein the continuous partial progressive loading sequence is loaded from one end to the other end in sequence, no overlapping area exists in two adjacent loading areas, and the interval between the two adjacent loading areas is the thickness of web reinforcing ribs of the Y-shaped ribbed frame body piece.
10. The continuous partial progressive loading precision forming method according to claim 4, wherein when the rib height is too high, the method adopts a two-pass or multi-pass forming mode to avoid the defects of insufficient filling and folding.

Description

Continuous local progressive loading precision forming die and method for frame with ribs Technical Field The invention relates to a technology in the field of metal plastic processing, in particular to a continuous local progressive loading precision forming die and method for an ultra-long Y-shaped ribbed frame body part. Background The main forming process of the frame piece with the ribs is machining based on plastic forming blank making, and the method has the defects of high forming tonnage, high cost, low performance and the like. The local loading process provides a new thought for labor-saving manufacturing of the components, but the female die is still large in specification, and the defects of local warping, rib penetration and the like are easily caused. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a continuous local gradual loading precision forming die and method for an ultra-long Y-shaped ribbed frame piece, which can obviously reduce the forming load of a component, improve the material utilization rate, reduce the manufacturing cost and the size of the whole die, and realize the effective forming of the ultra-long Y-shaped ribbed frame piece. The invention is realized by the following technical scheme: The invention relates to a continuous local progressive loading precision forming die for an ultra-long Y-shaped ribbed frame piece, which comprises a fixed female die, a movable female die, a front blank pressing die, a male die, a rear blank pressing die and a lower die plate, wherein the fixed female die and the movable female die are horizontally arranged oppositely, the front blank pressing die, the male die and the rear blank pressing die are arranged on the fixed female die, and the lower die plate is arranged under the movable female die, wherein blanks are input from one side of the fixed female die and one side of the movable female die, and are continuously output from the other side of the fixed female die and the movable female die. The front blank holder die and the rear blank holder die are respectively driven to press down through a front oil cylinder and a rear oil cylinder which are arranged on the upper die plate. The lower template is internally provided with a push rod which moves up and down, and the upper end of the push rod is contacted with the movable female die. The input sides of the fixed die and the movable die are provided with heating devices for preheating blanks. The blank is provided with a feeding device so as to realize horizontal movement of the blank and avoid protruding mould pressing to the web plate reinforcing rib of the Y-shaped ribbed frame body. The length of the movable female die is equal to that of the fixed female die, and the length of the movable female die is equal to that of the fixed female die, so that the assembled front blank holder die and the assembled rear blank holder die are both in the die structure. The length of the blank is the length of the target piece plus the length of the stub bar and the stub tail. The invention relates to a continuous local progressive loading precision forming method of an ultra-long Y-shaped ribbed frame body part based on the die, which comprises the following steps: the method comprises the steps of installing a die, namely assembling a movable female die on one side of the inner wall of a lower die plate through a T-shaped structure, fixedly arranging a fixed female die on the other side of the inner wall of the lower die plate through a boss and groove structure in a matched mode, sequentially installing a front oil cylinder, a male die and a rear oil cylinder on an upper die plate, respectively installing a front blank holder and a rear blank holder on the front oil cylinder and the rear oil cylinder, assembling the upper die plate and the lower die plate according to the characteristics of a component, fixedly arranging the upper die plate on an upper flat anvil of a press through a heat insulation plate, fixedly arranging the lower die plate on a lower flat anvil of the press through a heat insulation plate, fixedly arranging a heating device in front of the lower die plate, and clamping the end part of a blank, which is far away from the lower die plate, by a feeding device. And secondly, heating the upper die plate and the lower die plate by using heating pipes, and monitoring the temperatures of the male die and the movable female die by using corresponding temperature sensors. When the temperatures of the movable female die, the fixed female die, the male die, the front blank holder and the rear blank holder are close to the target forming temperature, starting the heating device; step three, a feeding device pushes the blank to be slowly conveyed below the male die through a heating device, and the blank is quickly preheated to be near the target forming temperature when passing through the heating device; And fourthly, starting the press, and down