CN102954337A

CN102954337A - Cross-sectional shape of strip plate for machining sheet metal strip having U-shaped cross section

Info

Publication number: CN102954337A
Application number: CN2011102506828A
Authority: CN
Inventors: 余波; 杨惟志
Original assignee: SHANGHAI GREENSAI HI-TECH MATERIALS Co Ltd
Current assignee: SHANGHAI GREENSAI HI-TECH MATERIALS Co Ltd
Priority date: 2011-08-29
Filing date: 2011-08-29
Publication date: 2013-03-06

Abstract

The invention relates to a cross-sectional shape of a strip plate for machining a sheet metal strip having a U-shaped cross section. The shape is a holosymmetric pattern which is symmetric both longitudinally and bilaterally; and a transition zone realizing the gradual change of thickness is arranged between a thin material t2 and thick material T2, thereby effectively improving the cooling uniformity of the thick and thin materials, and reducing or eliminating the generation of a solidification shrinkage partial internal stress at the junction of the thick and thin materials during the solidification shrinkage of the materials. Compared with the prior art, the cross-sectional shape has the beneficial effects that cracks of the strip plate are reduced or eliminated, the yield is increased, the stress state of a die is improved, the abrasion to the die is reduced, and the service life of the die is prolonged.

Description

A kind of made-up belt section configuration be used to processing U-shaped cross section sheet metal strip

Technical field

The present invention relates to a kind of made-up belt section configuration be used to processing U-shaped cross section sheet metal strip, relate in particular to for the made-up belt section configuration of working power transistor with U-shaped cross section copper alloy band.

Background technique

Be used as the section of the effective U-shaped of power crystal cross section copper alloy band usually by thin, thick two kinds of specifications form, thin material connects for lead-in wire is used for circuit, thick material supporting chip and heat radiation, its common section is seen Fig. 1, be channel section, the centre of section is thin material, the edge of the adjacent thick material in the edge of thin material and two limits has formed the trapezoidal of a concavity, two limits of section are the thick material of equivalent size, in order to satisfy the high velocity ram machine mould to the requirement of framework punching out, tolerance of size to U-shaped cross section band, surface roughness, lateral bending, residualinternal stresses etc. have very strict technical requirements, and the processing of U-shaped cross section band generally has following two main course of working:

1, the thick moulding of U-shaped cross section made-up belt,

2, the finish rolling moulding of U-shaped cross section band,

And the thick forming method of U-shaped cross section made-up belt has following two kinds usually according to the sectional shape difference that processes raw material:

1, adopt the band with rectangular cross-section to come the U-shaped cross section of machine shaping made-up belt,

2, the U-shaped cross section of machine shaping made-up belt is come in the cross section (seeing Fig. 2) of employing and finished product cross section scale-up,

The used rectangular cross-section band of method 1 obtains by multiple working procedures such as ingot blank hot rolling, cold rolling, slittings usually, strip quality is stable, mechanical property is good, but construction investment is large, cost is high, and the rectangular cross-section band because thick material and thin material part working modulus is different, makes the course of working complicated in the moulding in follow-up U-shaped cross section.And method 2 is to adopt the sectional shape with finished product cross section scale-up to cast U-shaped strand or extruding U-shaped base continuously as mold shape, its technological process is short, construction investment is economized, and U-shaped strand or extruding U-shaped base are in the moulding in follow-up U-shaped cross section, because thick material and the basic identical of thin material part working modulus make follow-up course of working become simple, but blank is in the process of thermoforming, because the U-shaped cross section is thick, inhomogeneous during the cooling of thin material, can be thick when solidification shrinkage, the local internal stress that produces of thin material intersection, when internal stress will cause material the interior detail crackle of naked eyes None-identified to occur greater than the tensile strength of material, obvious crackle can appear when serious, the underbead crack that naked eyes can not be identified adds man-hour carrying out cold pressure, tiny crackle can elongate and interrupted rectangular crackle occur, to making product rejection, simultaneously from the shape (Fig. 2) of made-up belt, because the step dimension of thickness material intersection is excessive and global shape asymmetric, cause mold integral unbalance stress and concentrated wear excessive and lost efficacy ahead of time, affect die life.

Summary of the invention

1. purpose of the present invention is exactly a kind of made-up belt section configuration that provides for the deficiency that overcomes said method 2 existence, this section configuration can reduce or eliminate material thick, the local internal stress that produces during thin material intersection solidification shrinkage, this section configuration does not affect the shaping operation in the follow-up U-shaped of band cross section simultaneously, purpose of the present invention can be achieved through the following technical solutions: described made-up belt section configuration (Fig. 3), it is a up and down holosymmetric figure, the middle part of figure tee section is thin material, the edge of the upper and lower of thin material and the edge of adjacent thick material have formed the trapezoidal of a laterally zygomorphic concavity, two limits of figure tee section are symmetrical thick material, a stepping transition zone of thickness is arranged between thin material t2 and thick material T2, A2 is the trapezoidal lower length of side of concavity, A2=A+ (3～7mm) (A is the trapezoidal lower length of side of concavity in the finished product band cross section in the formula), the α angle is the angle that the trapezoidal lower length of side A2 of concavity and transition zone plagioclase form, α=25 °～35 °, thin material thickness t 2=(6～13) t (t is thin material thickness in the finished product band cross section in the formula), thick material thickness T 2=(6～13) T (T is the thickness of thick material in the finished product band cross section in the formula), section width W2=W+ (2～10mm) (W is the width in the finished product band cross section in the formula), all there is round-corner transition: R=(2～8) mm at described made-up belt section configuration junction contour place, owing to significantly reduced the difference between monolateral thick material and thin material, and increased the scope of thickness material transition zone, with adopted symmetric figure, effectively improved thick, uniformity during thin material cooling, it is thick that material can be reduced or eliminated when solidification shrinkage, the generation of local internal stress during thin material intersection solidification shrinkage, in addition trapezoidal can in follow-up one or multi-channel groove rolling process, the pressing of concavity below the thin material place and do not affect quality.

This is invented compared with prior art, and useful effect is:

1, reduces or eliminates the crackle of made-up belt, improve yield rate.

2, improve the stress of mould and reduce the wearing and tearing of mould, improve die life.

Description of drawings

Fig. 1 is common U-shaped band finished product sectional schematic diagram.

Fig. 2 is original made-up belt section configuration.

Fig. 3 is made-up belt section configuration of the present invention.

Fig. 4 is another routine made-up belt section configuration of the present invention.

Embodiment

Below be the embodiment who does according to technical solution of the present invention by reference to the accompanying drawings, with further elaboration the present invention.

See Fig. 1, the thin material thickness t=0.45mm of the U-shaped band of finished product, thick material thickness T=1.27mm, A=25mm, W=54mm, made-up belt section configuration of the present invention is seen Fig. 3, the thin material thickness t of made-up belt 2=4.7mm, thick material thickness T 2=14.5mm, A2=30mm, α=35 °, W2=58mm, R=3mm.

Made-up belt section configuration shown in Figure 3 is a U-shaped band; the section configuration of made-up belt can be carried out a plurality of combination formings (Fig. 4) with single made-up belt section configuration (Fig. 3); forming many U-shaped bands is another kind of forms of the present invention, equally also in protection scope of the present invention.

Claims

1. one kind is used for the made-up belt section configuration process U-shaped cross section sheet metal strip, it is characterized in that, described made-up belt section configuration (Fig. 3), it is a up and down holosymmetric figure, the middle part of figure tee section is thin material, the edge of the upper and lower of thin material and the edge of adjacent thick material have formed the trapezoidal of a laterally zygomorphic concavity, two limits of figure tee section are symmetrical thick material, a stepping transition zone of thickness is arranged between thin material t2 and thick material T2, A2 is the trapezoidal lower length of side of concavity, A2=A+ (3～7mm) (A is the trapezoidal lower length of side of concavity in the finished product band cross section in the formula), the α angle is the angle that the trapezoidal lower length of side A2 of concavity and transition zone plagioclase form, α=25 °～35 °, thin material thickness t 2=(6～13) t (t is thin material thickness in the finished product band cross section in the formula), thick material thickness T 2=(6～13) T (T is the thickness of thick material in the finished product band cross section in the formula), section width W2=W+ (2～10mm) (W is the width in the finished product band cross section in the formula), all there is round-corner transition: R=(2～8) mm at described made-up belt section configuration junction contour place.

2. a kind of made-up belt section configuration be used to processing U-shaped cross section sheet metal strip as claimed in claim 1 is characterized in that the made-up belt of described section configuration is processed by casting, continuous casting, extruding, continuous squeezing method.

3. a kind of made-up belt section configuration be used to processing U-shaped cross section sheet metal strip as claimed in claim 1 is characterized in that, the section configuration of made-up belt can be carried out a plurality of combination formings (Fig. 4) with the made-up belt section configuration (Fig. 3) in the claim 1.