CN115382940A - Production process of stepped copper strip - Google Patents

Production process of stepped copper strip Download PDF

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Publication number
CN115382940A
CN115382940A CN202210942475.7A CN202210942475A CN115382940A CN 115382940 A CN115382940 A CN 115382940A CN 202210942475 A CN202210942475 A CN 202210942475A CN 115382940 A CN115382940 A CN 115382940A
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CN
China
Prior art keywords
die
belt
production process
copper
sizing
Prior art date
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Pending
Application number
CN202210942475.7A
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Chinese (zh)
Inventor
冯岳军
陈立群
葛晓瑜
陈亿
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Jiangyin Electrical Alloy Co Ltd
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Jiangyin Electrical Alloy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangyin Electrical Alloy Co Ltd filed Critical Jiangyin Electrical Alloy Co Ltd
Priority to CN202210942475.7A priority Critical patent/CN115382940A/en
Publication of CN115382940A publication Critical patent/CN115382940A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/20—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes from stock of essentially unlimited length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/02—Dies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)

Abstract

The invention relates to a production process of a stepped copper strip, wherein a copper rod enters an extrusion forming die of a continuous extruder for extrusion, a softened copper rod enters a die after entering a gasket from a die cavity for shunting, and the softened copper rod and the gasket are respectively formed into the stepped copper strip through sectional sizing belts; the leading belt is added to the thin edge of the preliminary formed step-shaped copper belt, the leading belt and the step-shaped copper belt are synchronously drawn, and the leading belt and the step-shaped copper belt are respectively rolled after coming out of the drawing machine. The invention has small pressure in the extrusion process, and copper bars with different thicknesses are produced by continuous extrusion, thereby greatly simplifying the production process flow of the special-shaped copper strip products.

Description

Production process of stepped copper strip
Technical Field
The invention relates to the technical field of nonferrous metal processing, in particular to a production process of a stepped copper strip.
Background
The stepped copper strip is mainly used for lead frames of high-voltage and low-voltage switches and plastic-packaged semiconductor elements, flexible connecting conductors of new energy automobiles and the like, and most of the stepped copper strips on the market adopt a multi-pass rolling process or a flattening process through stamping. The former has complex process, needs multiple heat treatment, needs to manufacture multi-pass special-shaped rollers, and has extremely long production period; the latter punching and flat-beating process can cause inconsistent integral hardness uniformity of the material, influence the use effect of the final product, and have low qualification rate of the finished product and high production cost.
Disclosure of Invention
The invention aims to overcome the defects and provides a production process of the stepped copper strip, which forms the special-shaped copper strips with different thicknesses through continuous extrusion, can improve the production efficiency of the special-shaped copper strips, reduces the production cost and can ensure the stability of the mechanical performance of products; the extrusion process has small pressure, and copper bars with different thicknesses can be produced by the extrusion mode, thereby greatly simplifying the production process flow of the special-shaped copper strip products and ensuring the integral uniformity of the material and the consistency of the mechanical performance in the subsequent cold deformation process.
The purpose of the invention is realized as follows:
a production process of a stepped copper strip comprises the following steps:
step one, extrusion: the copper rod enters an extrusion forming die of a continuous extruder for extrusion, the softened copper rod enters a gasket from a die cavity and then enters the die after being shunted, and stepped copper strips are formed by respective forming of sectional type sizing belts;
step two, cold drawing: and the leading belts are added to the thin edges of the preliminary-formed step-shaped copper belt, the leading belts and the step-shaped copper belt are synchronously drawn, and the leading belts and the step-shaped copper belt are respectively wound after coming out of the drawing machine.
Preferably, the extrusion forming die comprises a die cavity, a gasket and a die, a feeding cavity and a die accommodating cavity are arranged in the die cavity, the gasket and the die are arranged in the die accommodating cavity, and the die is arranged outside the gasket.
Preferably, a feeding channel, a first sizing band and a second sizing band are arranged in the die, the first sizing band and the second sizing band are arranged on the outlet side of the die, and the feeding channel is arranged on the inlet side of the die.
Preferably, the first sizing band and the second sizing band are arranged on the left and right sides, and the connection part is communicated.
Preferably, the first sizing band and the second sizing band are respectively communicated with the feeding channel.
Preferably, the thickness of the first bearing diameter is less than the thickness of the second bearing diameter, and the length of the first bearing diameter is less than the length of the second bearing diameter.
Preferably, the gasket is provided with a shunting hole, the shunting hole is 8-shaped, and the middle of the shunting hole is thin and the two sides of the shunting hole are thick.
Preferably, the die base material is hot-work die steel, an alloy die core is embedded in the outlet side of the hot-work die steel, and the first sizing belt and the second sizing belt are arranged on the alloy die core.
Preferably, an alloy dovetail is further arranged between the hot work die steel and the alloy die core.
The beneficial effects of the invention are:
1. the gasket adopts 8-shaped shunting holes, so that the edges of the sizing belts are fully filled with metal, and the stepped copper strip is convenient to form;
2. the die adopts a sectional sizing design, the length of the first sizing belt is smaller than that of the second sizing belt, so that the resistance of metal entering the first sizing belt is reduced, the resistance of metal entering the second sizing belt is increased, the flow rate of the metal entering the first sizing belt and the second sizing belt is balanced, and the integral forming of the stepped copper belt is facilitated;
3. the guide belt is made of a profile with the thickness being different from the thickness of the special-shaped copper belt material, the guide belt is added to the thin edge and rotates along with the step-shaped copper belt in the drawing process, so that the thin edge of the step-shaped copper belt also has a supporting stress point, the straightness and the flatness of the material in the drawing process are guaranteed, and the product quality is greatly improved.
4. The die cavity adopts the flat feeding cavity, reduces the pressure of the material in the extrusion process, thereby being convenient for material molding and simultaneously improving the service life of the die cavity.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a schematic structural view of an extrusion molding die.
Fig. 3 is an assembly view of the extrusion mold.
Fig. 4 is a front view of the mold.
Fig. 5 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 4.
Fig. 6 is a sectional view B-B of fig. 4.
Fig. 7 is a cross-sectional view taken along line C-C of fig. 4.
FIG. 8 is a schematic view showing the positional relationship between the leader and the stepped copper strip blank.
Wherein: an extrusion forming mold 1; a mold cavity 1.1; a feed chamber 1.1.1; a mold receiving cavity 1.1.2; a gasket 1.2; the shunt hole is 1.2.1; 1.3 of a mould; a feed channel 1.3.1; a first bearing diameter 1.3.2; a second bearing diameter 1.3.3; 1.3.4 of hot work die steel; 1.3.5 of an alloy mold core; alloy dovetail 1.3.6; a drawing machine 2; a leading belt 3; and 4, a step-shaped copper strip blank 4.
Detailed Description
Referring to fig. 1-8, the invention relates to a production device of a stepped copper strip, which comprises a continuous extruder, a drawing machine 2 and a leading belt 3, wherein the continuous extruder comprises an extrusion forming die 1, the leading belt 3 is wound and unwound by a leading belt pay-off rack and a leading belt take-up rack, a copper rod enters the extrusion forming die 1 of the continuous extruder to be extruded to form a stepped copper strip blank 4, and the stepped copper strip blank 4 and the leading belt 3 enter the drawing machine 2 together to be drawn.
Extrusion forming die 1 includes die cavity 1.1, gasket 1.2 and mould 1.3, be equipped with feed cavity 1.1.1 and mould in the die cavity 1.1 and hold chamber 1.1.2, feed cavity 1.1.1 is the platykurtic, the mould holds and is equipped with gasket 1.2 and mould 1.3 in the chamber 1.1.2, mould 1.3 sets up outside gasket 1.2, be equipped with feedstock channel 1.3.1, first calibrating strap 1.3.2 and second calibrating strap 1.3.3 in the mould 1.3, first calibrating strap 1.3.2 and second calibrating strap 1.3.3 set up the outlet side at mould 1.3, and set up about first calibrating strap 1.3.2 and the second calibrating strap 1.3.3.3, and the junction switches on, feedstock channel 1.3.1 sets up the entrance side at mould 1.3.
The first diameter bearing 1.3.2 and the second diameter bearing 1.3.3 are respectively communicated with the feed channel 1.3.1.
The bottom surfaces of the first bearing diameter 1.3.2 and the second bearing diameter 1.3.3 are flush. First diameter area 1.3.2 is used for the featheredge shaping of notch cuttype copper strips, second diameter area 1.3.3 is used for the thick limit shaping of notch cuttype copper strips, first diameter area 1.3.2's thickness is less than second diameter area 1.3.3's thickness.
In order to balance the flow rate of metal entering the first diameter belt 1.3.2 and the second diameter belt 1.3.3, the length of the first diameter belt 1.3.2 is smaller than that of the second diameter belt 1.3.3, so that the resistance of the metal entering the first diameter belt 1.3.2 is reduced, the resistance of the metal entering the second diameter belt 1.3.3 is increased, and the integral forming effect of the step type copper belt is facilitated.
Gasket 1.2 is equipped with diffluent hole 1.2.1, diffluent hole 1.2.1 is "8" style of calligraphy, thin both sides are thick in the middle of diffluent hole 1.2.1, ensure that the metal is full of first sizing area 1.3.2 and second sizing area 1.3.3, and the metal is followed diffluent hole 1.2.1 both sides and is given priority to get into first sizing area 1.3.2 and second sizing area 1.3.3 edge, ensures that the metal is full of the edge of each sizing area, has made things convenient for notch cuttype copper strips shaping.
Mould 1.3 substrate is hot work die steel 1.3.4, the outlet side of hot work die steel 1.3.4 inlays and is equipped with alloy mold core 1.3.5, first calibrating strap 1.3.2 and second calibrating strap 1.3.3 set up on alloy mold core 1.3.5, and the extrusion passageway shortens, and required extrusion pressure diminishes, has improved the intensity of mould greatly, has reduced material cost simultaneously, second calibrating strap 1.3.3's length is unanimous with alloy mold core thickness.
An alloy dovetail 1.3.6 is further arranged between the hot work die steel 1.3.4 and the alloy die core 1.3.5, and the alloy dovetail 1.3.6 ensures that the die does not deform seriously.
A production process of a stepped copper strip comprises the following steps:
step one, extrusion: the copper rod enters an extrusion forming die 1 of a continuous extruder for extrusion, the softened copper rod enters a die 1.3 after entering a gasket 1.2 from a die cavity 1.1 for shunting, and stepped copper strips 4 are formed by respective forming of sectional type sizing belts;
step two, cold drawing: leading belt 3 increases to the thin edge of preliminary fashioned notch cuttype copper strips 4, and leading belt 3 draws with notch cuttype copper strips 4 synchronous drawing, and leading belt 3 and notch cuttype copper strips 4 are from drawbench 2 back of coming out, and the rolling is separately.
Because the notch cuttype copper strips are thin on one side and thick on the other side, the stressed contact surface only has the thick side of the material in the process of drawing and rolling, so that the serious linearity of the drawn material is poor, a leading belt is designed in the process, the leading belt is made of a section with the thickness being different from the thickness of the special-shaped copper strips, the leading belt is added to the thin side and rotates along with the notch cuttype copper strips in the drawing process, the thin side of the notch cuttype copper strips also has a supporting stress point, the linearity and the flatness of the drawn material are ensured, and the quality of products is greatly improved.
The extrusion parameters of the continuous extruder are extrusion rotating speed of 9 r/min and extrusion current of 420-440A.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.

Claims (9)

1. A production process of a stepped copper strip is characterized by comprising the following steps: the method comprises the following steps:
step one, extrusion: the copper rod enters an extrusion forming die of a continuous extruder for extrusion, the softened copper rod enters a gasket from a die cavity and then enters the die after being shunted, and stepped copper strips are formed by respective forming of sectional type sizing belts;
step two, cold drawing: the leading belt is added to the thin edge of the preliminary formed step-shaped copper belt, the leading belt and the step-shaped copper belt are synchronously drawn, and the leading belt and the step-shaped copper belt are respectively rolled after coming out of the drawing machine.
2. The production process of the stepped copper strip of claim 1, wherein: the extrusion forming die comprises a die cavity, a gasket and a die, wherein a feeding cavity and a die accommodating cavity are arranged in the die cavity, the gasket and the die are arranged in the die accommodating cavity, and the die is arranged outside the gasket.
3. The production process of the stepped copper strip of claim 1, wherein: the die is characterized in that a feeding channel, a first sizing belt and a second sizing belt are arranged in the die, the first sizing belt and the second sizing belt are arranged on the outlet side of the die, and the feeding channel is arranged on the inlet side of the die.
4. The production process of the stepped copper strip according to claim 3, characterized in that: the first sizing belt and the second sizing belt are arranged on the left and right sides, and the connection part is communicated.
5. The production process of the stepped copper strip of claim 3, wherein: the first sizing belt and the second sizing belt are communicated with the feeding channel respectively.
6. The production process of the stepped copper strip of claim 3, wherein: the thickness of the first bearing is smaller than that of the second bearing, and the length of the first bearing is smaller than that of the second bearing.
7. The production process of the stepped copper strip according to claim 1, characterized in that: the gasket is provided with a shunting hole, the shunting hole is 8-shaped, and the middle of the shunting hole is thin and the two sides of the shunting hole are thick.
8. The production process of the stepped copper strip according to claim 3, characterized in that: the die base material is hot-work die steel, an alloy die core is embedded in the outlet side of the hot-work die steel, and the first sizing belt and the second sizing belt are arranged on the alloy die core.
9. The production process of the stepped copper strip of claim 8, wherein: and an alloy dovetail is also arranged between the hot work die steel and the alloy die core.
CN202210942475.7A 2022-08-08 2022-08-08 Production process of stepped copper strip Pending CN115382940A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210942475.7A CN115382940A (en) 2022-08-08 2022-08-08 Production process of stepped copper strip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210942475.7A CN115382940A (en) 2022-08-08 2022-08-08 Production process of stepped copper strip

Publications (1)

Publication Number Publication Date
CN115382940A true CN115382940A (en) 2022-11-25

Family

ID=84118184

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210942475.7A Pending CN115382940A (en) 2022-08-08 2022-08-08 Production process of stepped copper strip

Country Status (1)

Country Link
CN (1) CN115382940A (en)

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