Deep cavity welding chopper for welding gold strips and production process thereof
阅读说明：本技术 一种用于焊接金带的深腔焊劈刀及其生产工艺 (Deep cavity welding chopper for welding gold strips and production process thereof ) 是由 杨强 于 2019-09-03 设计创作，主要内容包括：本发明公开了一种用于焊接金带的深腔焊劈刀,包括呈柱状的劈刀主体,该劈刀主体的一端为金带引导部,另一端为焊接部；所述焊接部呈锥台形,其较大的一端面靠近金带引导部,其较小的一端面远离金带引导部；所述焊接部与金带引导部之间开设有缺口,该缺口包括平切面以及与该平切面衔接的斜切面；所述劈刀主体开设有穿透金带引导部的金带引导孔；所述焊接部较小的一端面开设有V型槽,所述平切面和V型槽靠近平切面的侧面之间开设有供金带穿过的金带固定孔；所述金带固定孔为方孔；所述焊接部较小的一端面开设了条状的弧形槽。本发明还公开了一种用于焊接金带的深腔焊劈刀的生产工艺。(The invention discloses a deep cavity welding chopper for welding a gold strip, which comprises a columnar chopper main body, wherein one end of the chopper main body is a gold strip guide part, and the other end of the chopper main body is a welding part; the welding part is in a frustum shape, one larger end surface of the welding part is close to the gold strip guiding part, and one smaller end surface of the welding part is far away from the gold strip guiding part; a notch is arranged between the welding part and the gold belt guiding part, and the notch comprises a plane section and a diagonal section connected with the plane section; the cleaver body is provided with a gold ribbon guide hole penetrating through the gold ribbon guide part; a V-shaped groove is formed in the smaller end face of the welding part, and a gold belt fixing hole for a gold belt to penetrate through is formed between the plane section and the side face, close to the plane section, of the V-shaped groove; the gold strip fixing hole is a square hole; and a strip-shaped arc-shaped groove is formed in the smaller end face of the welding part. The invention also discloses a production process of the deep cavity welding chopper for welding the gold strip.)
1. A deep cavity welding chopper for welding a gold strip is characterized by comprising a columnar chopper main body, wherein one end of the chopper main body is a gold strip guide part, and the other end of the chopper main body is a welding part; the welding part is in a frustum shape, one larger end surface of the welding part is close to the gold strip guiding part, and one smaller end surface of the welding part is far away from the gold strip guiding part; a notch is arranged between the welding part and the gold belt guiding part, and the notch comprises a plane section parallel to the axis of the riving knife main body and a diagonal section connected with the plane section; the plane cutting surface is positioned on one side of the axis where the riving knife main body is positioned, one end of the plane cutting surface is positioned on one end surface with a smaller welding part, the other end of the plane cutting surface extends towards the direction of the gold strip guiding part and is connected with one end of the oblique cutting surface, the other end of the oblique cutting surface extends towards the other side, opposite to the plane cutting surface, of the axis where the riving knife main body is positioned and extends to the side wall of the riving knife main body, and the oblique cutting surface inclines towards the direction far away from the welding part by taking the connection position of the oblique cutting surface and the; a gold ribbon guide hole penetrating through the gold ribbon guide part is formed in the axis where the riving knife body is located; a V-shaped groove is formed in the smaller end face of the welding part, the length direction of the V-shaped groove is parallel to the plane of the plane section, and a gold belt fixing hole for a gold belt to penetrate through is formed between the plane section and the side face, close to the plane section, of the V-shaped groove; the gold strip fixing hole is inclined towards the direction far away from the welding part by taking the joint of the gold strip fixing hole and the side surface of the V-shaped groove as a base point, the gold strip fixing hole is a square hole, and the width of two side surfaces of the gold strip fixing hole, which are vertical to the plane section, is smaller than the width of the other two side surfaces; the smaller end face of the welding part is provided with a strip-shaped arc-shaped groove, the length direction of the arc-shaped groove is consistent with that of the V-shaped groove, and the arc-shaped groove is positioned on one side, away from the plane section, of the V-shaped groove.
2. The deep cavity welding chopper for welding gold strips of claim 1, wherein the angle between the chamfer and the axis of the chopper body is in the range of 5 ° to 15 °.
3. The deep cavity welding chopper for welding the gold strip according to claim 1, wherein an included angle between an axis where the gold strip fixing hole is located and an axis where the chopper main body is located ranges from 30 ° to 60 °.
4. The deep cavity welding chopper for welding gold strips of claim 1, wherein the radial cross-sectional area of the gold strip fixing hole is gradually reduced from the plane cutting surface to the side surface of the V-shaped groove.
5. The deep cavity welding chopper for welding gold strips of claim 4, wherein the end of the gold strip fixing hole close to the flat cutting surface is a square conical hole which expands outwards.
6. The deep cavity welding chopper for welding the gold strip according to claim 1, wherein the depth-diameter ratio of the gold strip guide hole is 35-40: 1.
7. the deep cavity welding chopper for welding gold strips of claim 1, wherein the gold strip guide hole is square, and the width of two side surfaces perpendicular to the plane section is smaller than the width of the other two side surfaces.
8. A production process of the deep cavity welding chopper for welding the gold strips as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
s1, preparing a compact die, wherein a die cavity matched with the shape structures of the cleaver main body and the welding part is arranged in the compact die, and a die core matched with the wire penetrating hole is arranged in the die cavity;
s2, blank forming, namely paving superfine tungsten powder in the die cavity in the S1, adjusting the pressure in the die to be 1100-1500 MPa, and pressing to obtain a cleaver blank;
s3, placing the cleaver blank prepared in the S2 in a furnace to be sintered at high temperature of 1500-3000 ℃, improving the compactness of the cleaver blank, and finally cooling to obtain the cleaver;
and S4, sending the cleaver obtained in the step S3 to a numerical control machining center, machining a notch, a V-shaped groove and an arc-shaped groove, and then machining a gold strip fixing hole by adopting high-precision electric spark.
Technical Field
The invention relates to the field of microelectronics, in particular to a deep cavity welding chopper for welding a gold strip and a production process thereof.
Background
The traditional deep cavity welding riving knife for micro-electronic micro-connection welding wires is used for feeding wires of a full-automatic wire welding machine, when the welding wires enter the end face of a welding part, namely a working face, from inclined holes, the welding wires are fed quickly, the direction of the welding wires is unstable easily on the working face, and the welding wires are severely swung, so that the welding wire is not beneficial to full-automatic high-speed welding operation.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a deep cavity welding chopper for welding a gold strip and a production process thereof.
The technical scheme adopted by the invention is as follows:
a deep cavity welding chopper for welding a gold strip comprises a columnar chopper main body, wherein one end of the chopper main body is a gold strip guide part, and the other end of the chopper main body is a welding part; the welding part is in a frustum shape, one larger end surface of the welding part is close to the gold strip guiding part, and one smaller end surface of the welding part is far away from the gold strip guiding part; a notch is arranged between the welding part and the gold belt guiding part, and the notch comprises a plane section parallel to the axis of the riving knife main body and a diagonal section connected with the plane section; the plane cutting surface is positioned on one side of the axis where the riving knife main body is positioned, one end of the plane cutting surface is positioned on one end surface with a smaller welding part, the other end of the plane cutting surface extends towards the direction of the gold strip guiding part and is connected with one end of the oblique cutting surface, the other end of the oblique cutting surface extends towards the other side, opposite to the plane cutting surface, of the axis where the riving knife main body is positioned and extends to the side wall of the riving knife main body, and the oblique cutting surface inclines towards the direction far away from the welding part by taking the connection position of the oblique cutting surface and the; a gold ribbon guide hole penetrating through the gold ribbon guide part is formed in the axis where the riving knife body is located; a V-shaped groove is formed in the smaller end face of the welding part, the length direction of the V-shaped groove is parallel to the plane of the plane section, and a gold belt fixing hole for a gold belt to penetrate through is formed between the plane section and the side face, close to the plane section, of the V-shaped groove; the gold strip fixing hole is inclined towards the direction far away from the welding part by taking the joint of the gold strip fixing hole and the side surface of the V-shaped groove as a base point, the gold strip fixing hole is a square hole, and the width of two side surfaces of the gold strip fixing hole, which are vertical to the plane section, is smaller than the width of the other two side surfaces; the smaller end face of the welding part is provided with a strip-shaped arc-shaped groove, the length direction of the arc-shaped groove is consistent with that of the V-shaped groove, and the arc-shaped groove is positioned on one side, away from the plane section, of the V-shaped groove.
In order to facilitate the manual threading of gold wires, the traditional chopper is internally provided with an N-shaped or conical hole structure, and the straight-through gold ribbon guide hole is arranged in the chopper, so that the processing requirement is reduced compared with the traditional chopper, and the production efficiency is improved.
The gold belt fixing hole penetrates out of the side face of the V-shaped groove, and the V-shaped groove plays a role in reducing swing and stabilizing the direction of the gold belt in the process of conveying the gold belt at a high speed, so that the precision of the gold belt under the condition of high-speed movement is ensured.
Compared with the traditional chopper, the gold belt has smaller curvature from the outlet of the gold belt guide hole to the gold belt fixing hole, and is not easy to break under the condition of high-speed gold belt feeding of a full-automatic wire welding machine.
The width of the two side surfaces with the larger width of the gold strip fixing hole is slightly larger than the width of the gold strip, and the gold strip fixing hole is arranged to be a square hole, so that the gold strip is fixed, and the situations of inaccurate welding and easy breakage of the gold strip caused by rotation and distortion of the gold strip are avoided.
Preferably, the included angle between the inclined cutting surface and the axis of the riving knife main body ranges from 5 degrees to 15 degrees.
If the included angle between the inclined plane and the axis of the main body of the riving knife is too large, the area of the inclined plane is too small, so that the bending degree of the gold belt at the inclined plane is too large, and the gold belt is easy to break; if the included angle between the inclined plane and the axis of the main body of the riving knife is too small, the area of the inclined plane is too large, the gold belt is too early and too much exposed outside, and the protection effect of the gold belt guide hole on the gold belt is reduced; the angle is preferably 15-30 degrees.
Preferably, the included angle between the axis of the gold strip fixing hole and the axis of the riving knife main body ranges from 30 degrees to 60 degrees.
The gold ribbon fixing hole and the axis of the chopper main body form a certain included angle, so that the bending degree of the gold ribbon entering the gold ribbon fixing hole can be reduced, the full-automatic wire bonding machine can further ensure that the gold ribbon can be fed at high speed, and the included angle is preferably 30-60 degrees.
Preferably, the radial cross-sectional area of the gold strip fixing hole is gradually reduced from the plane section to the side surface of the V-shaped groove.
One end of the gold belt fixing hole, which is positioned on the side surface of the V-shaped groove, is smaller, so that the gold belt is limited, and the gold belt is fixed conveniently; the end of the gold belt fixing hole, which is positioned on the plane tangent plane, is larger, which is beneficial to the penetration of the gold belt.
Preferably, one end of the gold strip fixing hole close to the plane section is an outward-expanding square conical hole.
The end of the gold band fixing hole close to the plane section is provided with a square conical hole which expands outwards, so that the gold band can penetrate more conveniently.
Preferably, the depth-diameter ratio of the gold band guide hole is 35-40: 1.
the gold belt guide hole has larger depth-diameter ratio, and improves the welding precision and the capability of coping with complex conditions during the microelectronic deep cavity welding.
Preferably, the gold ribbon guide hole is square, and the width of two side surfaces of the gold ribbon guide hole perpendicular to the plane section is smaller than the width of the other two side surfaces.
The square gold ribbon guide hole has substantially the same function as the square gold ribbon fixing hole.
The production process of the deep cavity welding chopper for welding the gold strip comprises the following steps:
s1, preparing a compact die, wherein a die cavity matched with the shape structures of the cleaver main body and the welding part is arranged in the compact die, and a die core matched with the wire penetrating hole is arranged in the die cavity;
s2, blank forming, namely paving superfine tungsten powder in the die cavity in the S1, adjusting the pressure in the die to be 1100-1500 MPa, and pressing to obtain a cleaver blank;
s3, placing the cleaver blank prepared in the S2 in a furnace to be sintered at high temperature of 1500-3000 ℃, improving the compactness of the cleaver blank, and finally cooling to obtain the cleaver;
and S4, sending the cleaver obtained in the step S3 to a numerical control machining center, machining a notch, a V-shaped groove and an arc-shaped groove, and then machining a gold strip fixing hole by adopting high-precision electric spark.
The powder metallurgy process is adopted for manufacturing, the former machining and electric spark machining processes are replaced, tungsten powder is laid in a compact die, sintering treatment is carried out after a chopper blank is obtained through pressing, the structure is stable, a directly usable chopper is obtained through cooling, a large amount of cutting materials can be saved through the powder metallurgy process, the requirement on the machining precision of the chopper is high, the machining difficulty is high, the rejection rate is reduced through powder metallurgy processing, and the machining precision of a wire penetrating hole of the chopper is guaranteed.
The die core in the die is processed according to the designed size of the gold strip guide hole, the tool electrode in the electric spark processing is replaced, a large amount of feeding time of the tool electrode is saved, the production efficiency is improved, and the die is suitable for mass production of cleavers in industry.
Because the gold ribbon guide hole and the gold ribbon fixing hole are not parallel, if a die core mechanism is designed in the die for powder metallurgy processing, the cleaver is inconvenient to take out after forming, so that the gold ribbon guide hole and the gold ribbon fixing hole are short gold ribbon fixing holes after forming by high-precision electric spark processing, and the cost is low.
The invention has the beneficial effects that:
according to the invention, the inclined plane is formed at the outlet of the gold belt guide hole, so that the moving area of the gold belt after the gold belt penetrates out of the gold belt guide hole is enlarged, the actual bending length of the gold belt is increased when the gold belt is bent and enters the gold belt fixing hole, the bending degree is reduced, and the welding wire of the gold belt is not easy to break in the high-speed gold belt feeding process of the full-automatic wire welding machine; the V-shaped groove is arranged on the welding part, so that the gold strip is subjected to the effects of reducing swing and stabilizing the direction of the gold strip in the process of high-speed gold strip feeding, and the gold strip feeding precision under the condition of high-speed motion is ensured; the gold belt fixing hole is arranged to be a square hole, so that the gold belt is fixed, and the situations of inaccurate welding and easy breakage of the gold belt caused by rotation and distortion of the gold belt are avoided; the specific cleaver is prepared by adopting a powder metallurgy processing technology, the precision of the machined and formed cleaver is high, the rejection rate is reduced compared with the machining and manufacturing, a large amount of cutting materials are saved, the working efficiency is higher compared with the electric spark processing, the special cleaver is suitable for the production of large-scale cleavers in factories, the specific processing is carried out after the powder metallurgy processing is adopted for some structures of the cleaver which are difficult to be subjected to die sinking forming, the integral processing cost is reduced, and the integral processing efficiency is improved.
Drawings
FIG. 1 is a schematic view of a conventional riving knife;
FIG. 2 is a schematic front view of a deep cavity welding chopper for welding a gold strip according to an embodiment of the present invention;
FIG. 3 is a schematic bottom view of a deep cavity chopper for welding a gold strip according to an embodiment of the present invention;
FIG. 4 is a schematic view of section A-A of FIG. 3;
FIG. 5 is an enlarged view of detail A of FIG. 4;
description of reference numerals:
10. the traditional cleaver comprises a
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
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