CN2787326Y

CN2787326Y - Sheet material forming die based on pressure transmission of viscoelastic medium

Info

Publication number: CN2787326Y
Application number: CNU2005200093479U
Authority: CN
Inventors: 邓明; 罗光平; 罗静
Original assignee: Chongqing Institute of Technology
Current assignee: Chongqing Institute of Technology
Priority date: 2005-05-25
Filing date: 2005-05-25
Publication date: 2006-06-14
Anticipated expiration: 2015-05-25

Abstract

The utility model relates to a material plate forming die device based on viscoelastic medium transmission force. The utility model mainly includes a convex die, a pressing edge ring, a mould cavity for holding glutinous medium, an overflow valve and a manometer. The pressing edge ring is fixed on the cushioning die of a pressing machine, and the convex die is connected and mounted on the pressing machine by a thread. The mould cavity is mounted on the concave die rack of a test pressing machine by a purpose made nut, and is opposite to the convex die up and down. The bottom of the mould cavity is mounted with a sealed ring, a nut with a thread opening is spirally connected to the top end of the mould cavity, and a connecting pipe is connected out by the mould cavity and the nut and the overflow valve and the manometer are connected to the connecting pipe. The material plate forming die device can augment the distortion degree of materials, and enhances the forming limit of products, and is very applicable to the forming of difficult-to-form metal of complex shape parts, electron alloys, etc. The material plate forming die device is provided with simple structure, low cost, and strong universality, when the convex die is changed into different convex dies, and the material plate forming die device can be used for the same die to form parts with different shapes, and can also be used for testing the feature of the glutinous medium, the forming property of different material plates and the influence of the forming property of different back pressing pressure.

Description

A kind of sheet forming die device based on force transferring by viscoelastic medium

Technical field

The utility model relates to a kind of sheet forming technology, relates in particular to the soft mode or the half module flexible forming apparatus of plate, specifically is a kind of sheet forming device based on force transferring by viscoelastic medium.

Background technology

Along with industrial expansion, more and more high to dimensional accuracy, the surface quality requirement of sheet forming spare, often require part complex-shaped to some, that the shaping difficulty is big to process, and existing conventional pressure forming equipment can not be realized the processing to this class part.Just work has proposed the problem of a sternness to sheet forming for this: must work out some and can overcome conventional forming technology deficiency, have again that mfg. moulding die is simple, the cycle is short, cost is low, can improve the new technology of characteristics such as sheet forming performance, can adapt to the needs of modernization industry development.For this reason, the adhesive pressure forming technology is arisen at the historic moment.How on existing general pressure forming testing equipment, the industrial applied research of quickening this technology is an important content of sheet forming field work.

Summary of the invention

Problem to be solved in the utility model provides a kind of sheet forming die device based on force transferring by viscoelastic medium, it is a kind of new punching press bulging process device, it utilizes high visco-plasticity but the semi-solid material that is easy to flow forms the reverse side that back pressure acts on plate as pressure transmission medium, makes plate applying punch and being shaped under the effect of high-pressure medium.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of sheet forming die device based on force transferring by viscoelastic medium, it includes die cavity, overflow valve and the Pressure gauge of punch, blank holder, the sticking medium of splendid attire; Described blank holder is fixed on the pad mould of forcing press, and punch is positioned at blank holder, and is installed on the forcing press by thread connection; The die cavity of the sticking medium of described splendid attire is installed in by nut on the die frame of test pressure machine, and is relative up and down with punch; Sealing ring is equipped with in the bottom of die cavity, and its top is connected with threaded mouthful special nut, and by picking out tube connector with nut, is connected to overflow valve and Pressure gauge on tube connector.

When using this mould, install punch, blank holder, die cavity earlier, secondly utilize the elasticity of its existence to be pressed in advance in the seal groove of corresponding die cavity sealing ring, again plate is placed on the blank holder, open machine its pad mould rising is pressed on plate on the die cavity.Screw thread mouth by special nut adds sticking medium in the die cavity then, is that overflow valve and Pressure gauge are installed at last.Just waiting to set up after the oil pressure relief size once more, the opening pressure machine rises punch.Punch in uphill process, drive plate enter force in the die cavity its die cavity volume reduce compress sticking medium, the pressure in the die cavity is increased.Because what be in semi-solid resisting medium has quite high sensitiveness to strain rate, can set up pressure rapidly,, the back side that acts on plate makes sheet forming thereby making plate be affixed to punch under the effect to power.In addition, according to the punch travel of forcing press digital display, can calculate the reduction of die cavity volume, again according to what, predetermined oil pressure relief size and pressure-pad-force size of spillway discharge, can test out the physical characteristic of used viscoelastic medium, mainly based on sensitivity of strain rate.Can also measure in the sticking pressure medium forming technique back pressure to the material forming Effect on Performance, the different part shape that is shaped embodies the advantage of gluing the pressure medium forming technique to the requirement of sheet material and mould.

The beneficial effects of the utility model are: can overcome the deficiency that conventional building mortion exists, increase the distortion of materials degree, improve the forming limit of product, the shaping of difficult form metals such as complicated shape part and magnesium alloy is had extraordinary application prospect; Simple in structure, cost is low, can cooperate to be installed on the pressure forming testing equipment, and is easy to use; The utility model shaping dies is general strong, changes different punch and goes out difform part with regard to available same set of die forming; In addition, can conveniently measure back pressure to the influence of sheet forming process and to improving the influence of sheet forming performance.Can also measure physical characteristic, the strain hardening and strain-rate sensitivity characteristic of selected semisolid viscoelastic medium.Has important directive significance to how selecting for use suitable sticking medium to be used for sheet forming processing.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

On the pad mould 2-cupping machine on the 1-cupping machine with the blank holder component 3-blank holder 4-punch 5-plate 6-sealing ring 7-material chamber 8-cupping machine fovea superior mould bases 9-pad 10-nut 11-gasket seal 12-tube connector 13-overflow valve 14-Pressure gauge 15-viscoelastic medium that matches

The specific embodiment

Referring to Fig. 1, the utility model device comprises punch 4, blank holder 3, die cavity 7, overflow valve 13 and the Pressure gauge 14 of the sticking medium of splendid attire.Die assembly for molding shown in the figure is mounted on the semi-automatic cupping testing machine of GBS-60 digital display, and this cupping testing machine is a double action hydraulic press.Drift on this cupping testing machine, blank holder, die redesigned make it to meet sticking pressure medium forming technique requirement.Drift is by being shaped or the punch 4 of the requirement design cost device of testpieces, and die is made into the die cavity 7 that a inside can splendid attire viscoelastic medium 15.Blank holder 3 is by being fixed on the pad mould of cupping testing machine with the blank holder component 2 that matches on the cupping machine, and punch 4 is installed on the cupping machine relevant position by thread connection, can move up and down in blank holder 3.The die cavity 7 of the sticking medium of splendid attire is installed on the die frame 8 of test pressure machine by special nut 10, relative up and down with punch 4, rise by punch 4, bring die cavity 7 dischargeable capacitys to reduce, thereby the pressure of sticking medium in the die cavity 7 is increased, since be in semi-solid state resisting medium strain rate is had quite high sensitiveness, can set up pressure rapidly, make sheet forming thereby the back side that acts on plate makes plate be affixed to punch under the effect to power.Sealing ring 6 is equipped with in the bottom of die cavity 7, makes between die cavity 7 and the plate 5 under the effect of pressure-pad-force, relies on sealing ring 6 to seal.Die cavity 7 tops are connected with threaded mouthful nut 10, and pick out tube connector 12 by nut 10, on tube connector 12, be connected to overflow valve 13 and Pressure gauge 14, the size that overflow valve can be adjusted oil pressure relief provides the required back pressure pressure of sheet forming, and Pressure gauge can be observed the force value of being set up in the die cavity at any time.

Claims

1, a kind of sheet forming die device based on force transferring by viscoelastic medium, it is characterized in that: it includes blank holder (3), punch (4), the die cavity (7) of the sticking medium of splendid attire, overflow valve (13) and Pressure gauge (14); Described blank holder (3) is fixed on the pad mould of forcing press, and punch (4) is positioned at blank holder, and is installed on the forcing press by thread connection; The die cavity (7) of the sticking medium of splendid attire is installed on the die frame of test pressure machine by spin threaded mouthful nut (10) of top, relative up and down with punch (4), and by picking out tube connector (12) with nut (10), be connected to overflow valve (13) and Pressure gauge (14) on tube connector (12), sealing ring (6) is equipped with in the bottom of die cavity (7).

2, sheet forming die device according to claim 1 is characterized in that: splendid attire is semi-solid viscoelastic medium (15) in the die cavity (7).