CN104815900A - Aluminum channel section part stamping bending forming technology - Google Patents

Abstract

The invention relates to an aluminum channel section part stamping bending forming technology. The technology comprises processes of blanking, forming, bending and punching. The forming process includes the steps of protruding the upper edge of a channel outside at a bending line H-H to form an arc ab and an arc cd, forming a sector arc agb and a sector arc cgd with a point g at the bottom of the channel as the center, and using arcs R for natural transition of the connection portions with the arc sectors, wherein the length of the arc ab and the arc cd at the upper edge is similar to the length of a bent arc AB and a bent arc CD. The bending process includes the steps of bending the whole edge and straightening through to form a bent channel section, wherein the width W of a base plate is unchanged in the depth of the section. By means of the aluminum channel section part stamping bending forming technology, cracks of the channel side in secondary stretching are avoided during secondary stamping bending.

Description

A kind of aluminium alloy grooved section parts pressing and bending forming process

Technical field

The present invention relates to a kind of forming technology of aluminium alloy grooved section parts, the especially process of two times punch bending and forming.

Background technology

Auto parts manufacture field, and light-weight design is a kind of trend, in the non-security constitutional detail of automobile, adopt aluminum alloy materials to carry out alternative steel, to reach loss of weight object.Automobile cab instrument desk, there is a mounting framework inside, the material of its skeleton part, under automotive light weight technology design concept, all adopts aluminum alloy materials design.

Design of part shape, by the restriction in Auto Instrument desk space, under the prerequisite meeting former installation function, its planform continues to continue to use steel components shape.Percentage elongation due to aluminum alloy materials only has about 1/2 of steel, the planform identical with steel components, after material selection aluminium alloy, the drawability be shaped declines, easily crack, the special part needing two times punch to be shaped for some, the more difficult manufacturing process continuing to use use steel component.

For the part of aluminium alloy rectangle and trapezium channel section, need two times punch to be shaped exactly, continue to use steel component technique second time stamping after, just create crackle at bending R place, part has crackle to be unallowed.

Such as, as shown in Figure 1, existing a kind of grooved bending structure part, need two times punch bending and forming, the stile of the excurvation grooved of its bending, due to the impact of the forming property (percentage elongation) by material, easily crack, the general Sheet Metal Forming Technology flow process of its part is shown in Fig. 1.Its forming process is first step operation (OP05 operation) blanking, second step operation (OP10 operation) shaping (one-tenth grooved), three-procedure (OP20 operation) bending, the 4th step operation (OP30 operation) punching.Adopt steel material, four procedures just can complete the manufacture of part.After aluminium alloy material, after part carries out OP20 operation pressing and bending again, at the R place of part, circular arc AB, CD can crack, to making part forming failure.

Summary of the invention

Object of the present invention is not increasing under stamping procedure prerequisite, solves the problem of Cracking of aluminum alloy part after two times punch bending and forming.

Concrete technical scheme of the present invention is:

A kind of aluminium alloy grooved section parts pressing and bending forming process, comprise blanking, shaping, bending and punching operation, under the prerequisite not increasing existing stamping procedure, when forming process, at bending line H-H place, by grooved top edge, evagination becomes ab, cd circular arc laterally, point centered by the end g point of grooved, forms the fan-shaped cambered surface of agb, cgd, and the transition of R circular arc nature is taked in arcuate sectors and connection everywhere; In edge upper part, make the arc length of ab, cd close to AB, CD arc length after bending; Straight through bending process bending treating selvedge reason again, form the rectangle and trapezium channel section after bending; Constant in section depth upper plate width W.

Adopt above-mentioned preformation method, through secondary bending (OP20 operation), part is at bending R place, and AB, CD circular arc, does not crack.Under the prerequisite not increasing manufacturing cost, the complete material achieving part switches, and meets automotive light weight technology designing requirement.

Accompanying drawing explanation

Fig. 1 is the technique process block diagram of existing rectangle and trapezium channel section bending and forming.

Fig. 2 is OP10 operation of the present invention side direction preformed of the present invention figure.

Fig. 3 is the partial top view that OP10 operation side direction of the present invention is preformed in bending line place.

Fig. 4 is the partial sectional view that OP10 operation side direction of the present invention is preformed in bending line place.

Detailed description of the invention

By OP10 molding procedure, at bending line H-H place, sideline place on the upside of rectangle and trapezium channel section, extend into R arc laterally, ab, cd circular arc as shown in Fig. 2, Fig. 3 and Fig. 4, the evagination of R arc forms ab, cd circular arc, point centered by the bottom g point of grooved, form the fan-shaped cambered surface of agb, cgd, the transition of R circular arc nature is taked in fan-shaped cambered surface and connection everywhere; In edge upper part, make the arc length of ab, cd, close to after OP20 bending AB, CD arc length, formed as R arc structure in the top view of Fig. 3, in section depth, baseplate width W is constant, as the cross-sectional width W of Fig. 2, Fig. 3 and Fig. 4 in guarantee.

When OP20 bending and forming, under the effect of convex concave mould, by the fan-shaped cambered surface of preformed agb, cgd, carry out forcing shaping, finally formed after bending AB, CD circular arc, due to when OP20 bending, ab, cd length is close to AB, CD arc length, when carrying out forcing shaping, part edge Tensile deformation effect is less again, when forming bending AB, CD circular arc just without having ftractureed.

Be 2mm with material thickness, the AB arc length 19mm after shaping, preformed ab arc length 18.6mm is example, can complete shaping and not ftracture.Preform ab arc length is 97.9% of AB arc length.

Present invention efficiently solves this type of part secondary forming time tear phenomenon.By shaping rectangle and trapezium channel section first, the stile amount of tension that the shaping secondary bending and molding of pre-band needs, solves secondary forming problem of Cracking effectively.

Claims (1)

1. an aluminium alloy grooved section parts pressing and bending forming process, comprise blanking, shaping, bending and punching operation, it is characterized in that, when forming process, at bending line H-H place, by grooved top edge, evagination becomes ab, cd circular arc laterally, point centered by the end g point of grooved, forms the fan-shaped cambered surface of agb, cgd, and the transition of R circular arc nature is taked in arcuate sectors and connection everywhere; In edge upper part, make the arc length of ab, cd close to AB, CD arc length after bending; Straight through bending process bending treating selvedge reason again, form the rectangle and trapezium channel section after bending; Constant in section depth upper plate width W.