CN109465317B

CN109465317B - Rotary forming device for ultrasonic-assisted vibration multi-point mold support

Info

Publication number: CN109465317B
Application number: CN201811130828.3A
Authority: CN
Inventors: 梁继才; 陈传东; 陈广义; 李义; 梁策; 于开锋
Original assignee: Dalian University of Technology; Jilin University
Current assignee: Chongqing Research Institute of Jilin University
Priority date: 2018-09-27
Filing date: 2018-09-27
Publication date: 2020-03-10
Anticipated expiration: 2038-09-27
Also published as: CN109465317A

Abstract

The rotary forming device mainly comprises a workbench, a section clamp, a compression roller hydraulic transmission and force application device, a compression roller, a guard plate, a core mold, a hinge device, a sleeve, a core mold hydraulic transmission device, a spring, an amplitude transformer, an energy converter, an ultrasonic generating device, an elastic cushion, a non-mold multipoint mold, a spring shock absorber and a mold base. The forming shape of the die-free multipoint die can be adjusted according to actual processing requirements, and the frequency and the amplitude of the ultrasonic generator can be adjusted according to the material and the processing size of the actually processed section bar so as to achieve the purpose of auxiliary forming. The invention combines the bending forming device and the ultrasonic-assisted vibration multi-point supporting die technology together, and improves the stability of section forming, expands the forming limit and improves the product quality by improving the traditional section bending forming device.

Description

Rotary forming device for ultrasonic-assisted vibration multi-point mold support

Technical Field

The invention belongs to the technical field of metal section bending forming, and particularly relates to an ultrasonic-assisted plastic forming and die-free multipoint forming method.

Background

With the development of the light weight technology of automobiles, the high-strength steel of the automobile anti-collision beam is widely popularized and applied. Automobile manufacturers are required to reduce the defects of the anti-collision beam profile as much as possible to improve the stability of a formed part while requiring the strength and the hardness of the produced anti-collision beam to reach a certain degree. This presents a serious challenge to the manufacturers of the impact beam, and also presents a great challenge to the metal profile bending processing device and the processing method.

The conventional bending apparatus further bends the formed profile, such as rectangular profile, circular profile, etc., to deform the formed profile into a shape required for practical use. The defects of folds, fractures and the like can occur in the section bar in the forming process of the section bar.

At present, the bending compression stress part of an anti-collision beam profile formed by multiple roll bending has serious rugged wrinkle defects and tensile stress part generates tensile crack defects when the anti-collision beam profile is further bent. The surface defect of the section produced by the traditional section bending device is serious, the stability is poor, the production efficiency is low, the rejection rate is high, and the mass production is seriously restricted.

Therefore, there is a need in the art for a new solution to solve this problem.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the rotary forming device for the ultrasonic-assisted vibration multi-point die support is provided, the bending forming device and the ultrasonic-assisted vibration multi-point support die technology are combined together, and the traditional section bending forming device is improved, so that the section forming stability is improved, the forming limit is expanded, and the product quality is improved.

Rotatory forming device that ultrasonic wave auxiliary vibration multiple spot mould supported, characterized by: the device comprises a workbench, a section, a forming mechanism I and a forming mechanism II, wherein the section is fixedly arranged on the workbench through two section clamps; the forming mechanism II is identical to the forming mechanism I in structure and is arranged at two ends of the section in a mirror symmetry mode; the forming mechanism I comprises a compression roller hydraulic transmission and force application device, a compression roller, a guard plate, a core mold, a hinge device, a sleeve, a core mold hydraulic transmission device, a spring, an amplitude transformer, an energy transducer, an ultrasonic generator, an elastic pad, a mold-free multi-point mold, a spring shock absorber and a mold base, wherein the core mold is arranged at the end part of the section bar, and the core mold hydraulic transmission device are connected with the hinge device through the sleeve; the pressing device is arranged at the upper part of a position to be formed on one side of the section bar, and the pressing roller hydraulic transmission and force application device is arranged at the upper part of the pressing roller; the guard plate is arranged at the end part of the section bar; the die-free multipoint die is arranged on the die base and is connected with the amplitude transformer through a bolt, the lower end of the die-free multipoint die is provided with a spring, and the lower end of the spring is provided with a spring shock absorber; the amplitude transformer is connected with the transducer; the transducer is connected with an ultrasonic generator; the elastic cushion is arranged between the section bar and the die-free multi-point die.

The guard plate comprises an upper guard plate and a side guard plate which are respectively arranged above and in front of the end part of the section bar.

The length of the core mold extending into the section is the same as the length of the section to be bent.

The mould base is arranged on the workbench.

Through the design scheme, the invention can bring the following beneficial effects: the rotary forming device for the ultrasonic-assisted vibration multi-point die support combines a bending forming device and an ultrasonic-assisted vibration multi-point support die technology together, and obviously reduces the defects of the curved surface wrinkles on the inner side of the produced anti-collision beam by improving the traditional section bending forming device, utilizing the ultrasonic-assisted vibration plastic forming process and utilizing the flexible and adjustable advantages of a dieless multi-point die; the forming stability of the section is improved, the forming limit of the section is expanded, and the product quality is improved.

Furthermore, compared with the common mould, the mould-free multipoint mould adopted by the invention has the greatest advantages that the position and the direction of each small mould are adjustable, and the application of vibration force is facilitated and the vibration effect is achieved. The forming shape and the forming radian of the die can be adjusted according to the actual processing process in the production process so as to meet the required requirements. Based on the roll bending forming principle of the fixed die, the fixed forming die is replaced by a die-free multipoint die which can have certain amplitude along the vertical direction of the profile, each die-free multipoint die is supported by a spring shock absorber and a spring on a bolt, each die is mounted on each bolt to be fixed according to actual conditions, and each die can achieve the purpose of vibrating along the vertical direction of the profile during vibration.

Drawings

The invention is further described with reference to the following figures and detailed description:

FIG. 1 is a schematic view of an ultrasonic-assisted vibration multi-point mold support rotational molding apparatus of the present invention.

FIG. 2 is a partially enlarged schematic view of the rotational forming apparatus for ultrasonic assisted vibration multi-point mold support of the present invention.

FIG. 3 is a schematic diagram of the rotary forming device supported by the ultrasonic-assisted vibration multi-point mold before and after deformation.

In the figure, 1-a workbench, 2-a section, 3-a section clamp, 4-a compression roller hydraulic transmission and force application device, 5-a compression roller, 6-a guard plate, 7-a core die, 8-a hinge device, 9-a sleeve, 10-a core die hydraulic transmission device, 11-a spring, 12-an amplitude transformer, 13-a transducer, 14-an ultrasonic generator, 15-an elastic pad, 16-a dieless multipoint die, 17-a spring shock absorber and 18-a die base.

Detailed Description

The rotary forming device for supporting the ultrasonic-assisted vibration multi-point die comprises a workbench 1, a section bar 2, a forming mechanism I and a forming mechanism II, wherein the section bar 1 is fixedly arranged on the workbench 1 through two section bar clamps 3; the forming mechanism II is identical to the forming mechanism I in structure and is arranged at two ends of the section bar 2 in a mirror symmetry mode; the forming mechanism I comprises a compression roller hydraulic transmission and force application device 4, a compression roller 5, a guard plate 6, a core mold 7, a hinge device 8, a sleeve 9, a core mold hydraulic transmission device 10, a spring 11, an amplitude transformer 12, an energy converter 13, an ultrasonic generator 14, an elastic pad 15, a non-mold multipoint mold 16, a spring shock absorber 17 and a mold base 18; a core mould 7, a sleeve 9 and a core mould hydraulic transmission device 10 are respectively arranged on two sides of the section bar 2, the core mould 7 and the core mould hydraulic transmission device 10 are connected through the sleeve 9 by a hinge device 8, and the core mould 7 can control the length of the core mould 7 by the core mould hydraulic transmission device 10 through the sleeve 9; the core mould 7 extends into the section bar 2 before processing to play a role of supporting the section bar internally; the mandrel 7 extends into a length corresponding to the length of the curved portion of the profile 2.

The guard board 6 comprises an upper guard board and a side guard board which are respectively arranged above and in front of the end part of the section bar 2. The upper guard plate and the side guard plates play a role in protecting the surface of the section bar 2 from being abraded, and can also inhibit the longitudinal over-extension of the side surface of the section bar 2 when the section bar is extruded.

The die-free multipoint die 16 is arranged on a die base 18, the die base 18 is arranged on the workbench 1, the lower end of the die-free multipoint die 16 is sleeved on a bolt through a spring damper 17 and a spring 11 to play a supporting role, and the bottom end of the bolt is connected with the amplitude transformer 12 through a threaded hole. In addition, a transducer 13 is connected above the amplitude transformer 12, and under the condition that a certain frequency and amplitude are set by the ultrasonic generator 14, the energy generated by the ultrasonic generator 14 is transmitted to the transducer to generate mechanical vibration so as to achieve the effect of vibration.

The ultrasonic generator device 14 is used for generating ultrasonic frequency electric oscillation, providing the ultrasonic frequency electric oscillation to the transducer 13, converting the ultrasonic frequency electric oscillation into mechanical oscillation with the same frequency by the transducer 13, and the amplitude transformer 12 amplifies the displacement or the movement speed of the mechanical oscillation and applies the amplified displacement to the die-free multipoint die 16 so as to meet the requirement of ultrasonic-assisted plastic forming.

The spring damper 17 and the spring 11 can play a supporting role in the forming process, and can play a damping role in the extrusion of the die-free multi-point die 16 and enhance the effect of the up-and-down vibration of the die-free multi-point die 16.

The fixed forming die is replaced by the dieless multipoint die 16 which can have a certain fluctuation range along the vertical direction of the section bar, each dieless multipoint die 16 is supported by the spring shock absorber 17 and the spring 11 on the bolt, 3 to 5 bolts are arranged on each die for fixing, and the purpose of vibrating along the vertical direction of the die can be achieved during vibration.

As shown in fig. 3, the profile 2 rests on an elastic pad 15, next to a dieless multipoint die 16. The elastic cushion 15 can make the lateral stress of the section bar 2 more uniform in the forming process and reduce the excessive distortion of the anti-collision beam in the bending forming process. The bending formation begins by turning on the ultrasonic generator 14 to generate energy, which is converted into mechanical kinetic energy by the energy generated by the ultrasonic generator via the transducer 13 and the horn 12, respectively. Each of the dieless multipoint moulds 16 is made to have the effect of oscillating in the direction of the vertical profile 2. Then, the press roller 5 applies a roller pressure to the profile 2, so that the press roller 5 is subjected to press bending forming around a set certain radian. The profile 2 is pressed against the spring mat 15 during the entire press-bending process and is simultaneously bent by the dieless multipoint die 16 along the inside and outside of the oscillating profile 2 in the vertical direction of the profile 2 until the end of the forming process.

Claims

1. Rotatory forming device that ultrasonic wave auxiliary vibration multiple spot mould supported, characterized by: the forming device comprises a workbench (1), a section bar (2), a forming mechanism I and a forming mechanism II, wherein the section bar (1) is fixedly arranged on the workbench (1) through two section bar clamps (3); the forming mechanism II is the same as the forming mechanism I in structure and is arranged at two ends of the section bar (2) in a mirror symmetry mode; the forming mechanism I comprises a compression roller hydraulic transmission and force application device (4), a compression roller (5), a guard plate (6), a core mold (7), a hinge device (8), a sleeve (9), a core mold hydraulic transmission device (10), a spring (11), an amplitude transformer (12), an energy converter (13), an ultrasonic generator (14), an elastic pad (15), a non-mold multipoint mold (16), a spring shock absorber (17) and a mold base (18), wherein the core mold (7) is arranged at the end part of the section bar (2), and the core mold (7) and the core mold hydraulic transmission device (10) are connected with the hinge device (8) through the sleeve (9); the compression roller (5) is arranged at the upper part of a position to be formed on one side of the section bar (2), and the compression roller hydraulic transmission and force application device (4) is arranged at the upper part of the compression roller (5); the guard plate (6) is arranged at the end part of the section bar (2); the die-free multipoint die (16) is arranged on the die base (18) and is connected with the amplitude transformer (12) through a bolt, the lower end of the die-free multipoint die (16) is provided with a spring (11), and the lower end of the spring (11) is provided with a spring shock absorber (17); the amplitude transformer (12) is connected with the transducer (13); the energy converter (13) is connected with an ultrasonic generator (14); the elastic pad (15) is arranged between the section bar (2) and the dieless multipoint mould (16).

2. The ultrasonic assisted vibration multi-point mold supported rotary former of claim 1, further comprising: the guard board (6) comprises an upper guard board and a side guard board which are respectively arranged above and in front of the end part of the section bar (2).

3. The ultrasonic assisted vibration multi-point mold supported rotary former of claim 1, further comprising: the length of the core mold (7) extending into the section bar (2) is the same as the length of the section bar (2) to be bent.

4. The ultrasonic assisted vibration multi-point mold supported rotary former of claim 1, further comprising: the mould base (18) is arranged on the workbench (1).