CN204262179U - A kind of automobile support assembly flanging die with springback compensation - Google Patents

Abstract

The utility model relates to a kind of automobile support assembly flanging die with springback compensation, comprise upper bolster, upper male mould, die shoe, lower cavity die, described upper male mould is provided with the projection matched with the angle of bend of automobile support assembly bending part, described lower cavity die is provided with the groove matched with the angle of bend of described automobile support assembly bending part, and the die cavity angle formed after described projection and groove matched moulds is the cavity with springback compensation angle.Compared with prior art, the utility model such as to have at the advantage.

Description

A kind of automobile support assembly flanging die with springback compensation

Technical field

The utility model relates to springback compensation, especially relates to a kind of automobile support assembly flanging die with springback compensation.

Background technology

Plate is in stamping process, stress distribution situation on plate is very complicated, from mode of texturing, the formability drawing often of plate, flange, the anabolic process of the various deformation mode such as bending, stampingly on the surface seem very simple, but in fact it be one very complicated, multiple nonlinear mechanical process, influence factor is a lot of in this process, comprise the forming property of material, plate original shape and size, mould geometry, the lubricating condition of mould and plate, process conditions are (as pressure-pad-force, stamping press, punching press frequency, drawing velocity) etc., these factors are closed by mutual lotus root, mutual restriction, affect sheet metal forming quality to some extent.

Generally speaking, the main forming defects of sheet metal forming has: break, wrinkling and resilience.

Bending springback is one of most typical phenomenon of Sheet metal forming, when part after shaping takes out from mould, the elastic stress that crooked position is remaining can make elastic angle slightly increase, because elastic deformation recovers, workpiece produces resilience, as the α angle in the bending part 101 in Fig. 1 medium-height trestle assembly because the resilience of product can become large, control α angle in bending part 101 very crucial, α angle affects support to mate fine or not key with other parts.

1. affect the factor of bending springback:

1) material mechanical performance, the size of rebound value is directly proportional to the yield strength 6s of plate, is inversely proportional to elastic modulus E.

2) relative bending radius

Relative bending radius represents the deformation extent of bending forming, and rebound value is directly proportional to relative bending radius,

3) angle of bend

In certain relative bending radius situation, angle of bend is larger, then deformed area is larger, and the angle resilience value of workpiece is also larger.

4) size of bending force

Varying in size of bending force, makes rebound value also different, and be with the power during bend ratio free bend correcting composition large, calibrated force is larger, and bending springback is less.

5) die clearance

Die clearance has a direct impact resilience, and gap is less, and rebound value is less, and die clearance is larger, and resilience is also large.

6) shape of bool

When complex-shaped bool once curves, because each several part pins down mutually, make resilience difficulty, thus springback angle reduces.

7) mould structure and pressure-pad-force size: pressure-pad-force is large, and after workpiece bows, springback capacity is little.

2. the measure of decreasing rebound:

1) increase correcting process: use bending with sizing operation, larger calibrating (base measuring) pressure is applied to bool, the stress-strain state of its deformed area can be changed, with decreasing rebound amount,

2) change friction condition: rationally change friction condition, reduce the impact of friction on resilience.

3) distribution is bending, buckled zone pre-bending 45 degree, then is bent into 90 degree, can improves the bending angle of part like this, controls resilience.

4) add reinforcement at buckled zone, to improve the rigidity of part, suppress resilience.

But the measure inefficiency of these decreasing rebounds or control inaccuracy, cost is high.

Summary of the invention

The purpose of this utility model is exactly the automobile support assembly flanging die with springback compensation in order to overcome defect that above-mentioned prior art exists and effective control resilience of providing a kind of both economy to raise the efficiency.

The purpose of this utility model can be achieved through the following technical solutions: a kind of automobile support assembly flanging die with springback compensation, comprise upper bolster, upper male mould, die shoe, lower cavity die, it is characterized in that, described upper male mould is provided with the projection matched with the angle of bend of automobile support assembly bending part, described lower cavity die is provided with the groove matched with the angle of bend of described automobile support assembly bending part, and the die cavity angle formed after described projection and groove matched moulds is the cavity with springback compensation angle.

Described die cavity angle equals the difference of the angle of bend of automobile support assembly bending part and the angle at springback compensation angle.

Described springback compensation angle Δ α is:

$\mathrm{\Δ\α}=\frac{\mathrm{\α}}{90}\mathrm{\Δ}{\mathrm{\α}}_{90}$

Wherein: Δ α is springback compensation angle (°);

The angle of bend (°) of α-automobile support assembly bending part;

Δ α ₉₀springback angle when-angle of bend is 90 °.

When relative bending radius r/t < (5 ~ 8) of bool (r is relatively complete radius, and t is material thickness mm), the change of bending radius is general very little, can not consider.And only consider the resilience change of angle of bend.Look-up table (existing list 3-1 is for reference) can be used, look into the experiential modification numerical value getting springback angle.When angle of bend is not 90 °, its springback angle is available above-mentioned formulae discovery then.

Springback angle during the table mono-90 ° of bending with sizings in angle of 3-1

Described lower cavity die is fixed by screws on die shoe, and is provided with nitrogen spring between lower cavity die and die shoe.

Compared with prior art, the utility model mould structure is taken measures: penalty method, utilize the feature that bool different parts rebound direction is contrary, by estimation in advance or the springback capacity calculating gained, revise size and the geometry of punch and die working portion, resilience in the opposite direction compensates the springback capacity of workpiece.

Accompanying drawing explanation

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

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.

Embodiment 1

As shown in Figure 1, a kind of automobile support assembly flanging die with springback compensation, comprises upper bolster 1, upper male mould 2, die shoe 3, lower cavity die 4, lower cavity die 4 is fixed by screws on die shoe 3, and between lower cavity die and die shoe, is provided with nitrogen spring 5.

Described upper male mould 2 is provided with the projection matched with the angle of bend of automobile support assembly bending part, described lower cavity die 4 is provided with the groove matched with the angle of bend of described automobile support assembly bending part, the die cavity angle formed after described projection and groove matched moulds is the cavity with springback compensation angle, and namely described die cavity angle equals the difference of the angle of bend of automobile support assembly bending part and the angle at springback compensation angle.

Described springback compensation angle Δ α is:

$\mathrm{\&Delta;\&alpha;}=\frac{\mathrm{\&alpha;}}{90}\mathrm{\&Delta;}{\mathrm{\&alpha;}}_{90}$

Wherein: Δ α is springback compensation angle (°);

The angle of bend (°) of α-automobile support assembly bending part;

Δ α ₉₀springback angle when-angle of bend is 90 °.

R/t=5/1.75=2.85 < (5 ~ 8), Δ α in the present embodiment ₉₀=2, bend angles alpha=55.7 (angle that automobile support requires) of automobile support assembly bending part.

Obtain Δ α=55.7/90 × 2=1.24 ° in the above-mentioned formula of substitution formula and get 1.3 °

Therefore, the die cavity angle formed after matched moulds in this flanging die is β=α-Δ α=54.4, and can round is 54 degree.

Claims (3)

1. the automobile support assembly flanging die with springback compensation, comprise upper bolster, upper male mould, die shoe, lower cavity die, it is characterized in that, described upper male mould is provided with the projection matched with the angle of bend of automobile support assembly bending part, described lower cavity die is provided with the groove matched with the angle of bend of described automobile support assembly bending part, and the die cavity angle formed after described projection and groove matched moulds is the cavity with springback compensation angle.

2. a kind of automobile support assembly flanging die with springback compensation according to claim 1, it is characterized in that, described die cavity angle equals the difference of the angle of bend of automobile support assembly bending part and the angle at springback compensation angle.

3. a kind of automobile support assembly flanging die with springback compensation according to claim 1, it is characterized in that, described lower cavity die is fixed by screws on die shoe, and is provided with nitrogen spring between lower cavity die and die shoe.