CN110961743A - Technology for processing deep cavity welding cleaver and tool point thereof - Google Patents
Technology for processing deep cavity welding cleaver and tool point thereof Download PDFInfo
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- CN110961743A CN110961743A CN201911018304.XA CN201911018304A CN110961743A CN 110961743 A CN110961743 A CN 110961743A CN 201911018304 A CN201911018304 A CN 201911018304A CN 110961743 A CN110961743 A CN 110961743A
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- chopper
- tungsten powder
- die
- cleaver
- riving knife
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a process for processing a deep cavity welding chopper and a knife tip thereof, the chopper is cylindrical, one end of the chopper is a welding end in a frustum pyramid shape, a step-shaped unfilled corner is arranged on the end surface of the welding end along the length direction of the chopper, and a wire penetrating hole is arranged from the other end of the chopper to the notch, the process comprises the following steps: s1, preparing a compact die, processing a die cavity matched with the shape of the riving knife in the compact die, and arranging a die core matched with the wire penetrating hole in the die cavity; s2, preparing tungsten powder, and reducing tungsten trioxide by using hydrogen through a reaction furnace to obtain tungsten powder; s3, forming a cleaver, namely placing tungsten powder in a compaction die for compression molding to obtain the cleaver; s4, processing the cutter point of the riving knife, wherein the end face of the welding end of the riving knife is a working face, performing precise linear cutting on the working face of the riving knife, and processing the front face and the side face of the working face of the riving knife into rough faces. The process for machining the deep cavity welding cleaver and the tool nose thereof has the advantages of low workpiece rejection rate, high machining precision and greatly improved machining speed.
Description
Technical Field
The invention relates to the technical field of microelectronics, in particular to a process for machining a deep cavity welding chopper and a tool nose thereof.
Background
A deep cavity welding chopper for micro-electronic connection is characterized in that a gold wire with the diameter of 18-25 mu m is arranged in a hole of the chopper in a penetrating manner to serve as a welding material, the hole diameter of the wire penetrating of the chopper is small, and the penetrating process can be generally carried out by means of a microscope. At present, in the production process of a riving knife, particularly for the roughness processing of the knife point working surface of the riving knife, an electro-corrosion mode is adopted, the processing precision of the processing mode is not high, the processing time is long, the roughness is not well controlled, the strength of the knife point working surface is reduced after corrosion, and the service life of the knife is influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a process for machining a deep cavity welding chopper and a tool nose thereof, and the process has the advantages of low rejection rate of workpieces and high machining precision.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a process of processing deep cavity welding chopper and knife tip thereof, this chopper is cylindricly, and the one end of chopper is for being the welded end of prismoid form, offers the unfilled corner of step form along the length direction of this chopper on the terminal surface of welded end, and the wire feed hole has been offered to the chopper other end to the breach, includes following step:
s1, preparing a compact die, processing a die cavity matched with the shape of the riving knife in the compact die, and arranging a die core matched with the wire penetrating hole in the die cavity;
s2, preparing tungsten powder, and reducing tungsten trioxide by using hydrogen through a reaction furnace to obtain tungsten powder;
s3, forming a cleaver, namely placing tungsten powder in a compaction die for compression molding to obtain the cleaver;
s4, processing the cutter point of the riving knife, wherein the end face of the welding end of the riving knife is a working face, performing precise linear cutting on the working face of the riving knife, and processing the front face and the side face of the working face of the riving knife into rough faces.
According to the invention, the tungsten powder is paved in a compact die and sintered after being pressed to obtain a chopper blank by adopting a powder metallurgy process instead of the conventional machining and electric spark machining processes, so that the structure is stable, a directly usable chopper is obtained by cooling, a large amount of cutting materials can be saved by adopting the powder metallurgy processing process, the requirement on the machining precision of the chopper is high, the machining difficulty is high, the rejection rate is reduced by adopting the powder metallurgy processing, and the machining precision of a wire penetrating hole of the chopper is ensured.
The die core in the die is processed according to the size designed by the wire-through 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.
The tool point of the riving knife needs to have certain roughness, otherwise, after the tool point is contacted with the gold wire, if sufficient friction force does not exist, ultrasonic energy is difficult to transfer to the gold wire.
Preferably, step S3 specifically includes the following steps:
s31, forming a blank, namely paving tungsten powder in a compact die, and pressing the tungsten powder by the compact die to obtain a cleaver blank;
s32, strengthening the structure of the cleaver, sintering the blank of the cleaver at 1350-1450 ℃ at high temperature to improve the compactness of the blank, and cooling to obtain the cleaver.
Preferably, the grain size of the tungsten powder is 0.1 to 1.2 μm.
Preferably, step S2 further includes the steps of:
s21, screening out coarse tungsten powder with the grain size larger than 1.2 mu m from the tungsten powder, grinding the coarse tungsten powder until the grain size is smaller than 1.2 mu m, and mixing the coarse tungsten powder with the fine tungsten powder for use.
Preferably, step S32 further includes the steps of:
s321, wire guide holes for communicating the end face of the welding end with the notch are machined in the riving knife through high-precision electric sparks.
The wire guide holes are arranged, so that the gold wires can be guided after penetrating out of the wire through holes, excessive gold wires are prevented from being exposed outside the welding end, certain protection is further formed on the gold wires, the structure of the wire guide holes is obliquely arranged, if a mold core mechanism of the wire guide holes is designed in a mold, a riving knife is inconvenient to take out after molding, and therefore high-precision electric spark machining is adopted after molding, and the cost is low.
Preferably, in step S31, the pressure of the green compact mold during pressing is 500MPa to 1100 MPa.
Preferably, a first wire penetrating hole, a transition hole and a second wire penetrating hole which are communicated with each other are arranged from the notch to the other end of the riving knife in the wire penetrating hole, the section of the transition hole is in a circular truncated cone shape, and the depth-diameter ratio of the second wire penetrating hole is larger than 20: 1, the diameter of the second wire penetrating hole is 0.3mm-0.5 mm.
The cleaver is special in structure, if the traditional machining is adopted, the machining difficulty is high, and the electric spark machining time is too long, so that the powder metallurgy machining is particularly suitable for mass production of the special cleaver.
Preferably, the working surface of the riving knife has a roughness of Ra0.2-Ra0.8.
The invention has the beneficial effects that:
1. the invention adopts powder metallurgy process to manufacture, replaces the prior machining and electric spark processing process, lays tungsten powder in a compact die, and carries out sintering treatment after pressing to obtain a chopper blank, so that the structure is stable, and a directly usable chopper is obtained by cooling.
2. The die core in the die is processed according to the size designed by the wire-through 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.
3. The processing method has the advantages that the working face of the riving knife is processed through precise linear cutting, the processing precision is high, the front face and the side face of the working face of the riving knife can be conveniently processed, the processing speed is high, and the working efficiency is high.
4. Set up the wire guide hole and can wear out the threading hole back to the gold wire and play the guide effect, avoid too much exposing of gold wire outside the weld end, and then form certain protection to the gold wire, and the structure in wire guide hole sets up for the slope, if the mold core mechanism in wire guide hole is designed in the mould, inconvenient riving knife takes out after the shaping, so adopt high accuracy spark-erosion machining after the shaping, the cost is lower, satisfies the requirement of working face roughness simultaneously easily: Ra0.2-Ra0.8.
5. The cleaver is special in structure, if the traditional machining is adopted, the machining difficulty is high, and the electric spark machining time is too long, so that the powder metallurgy machining is particularly suitable for mass production of the special cleaver.
Drawings
FIG. 1 is a schematic structural diagram of a riving knife according to an embodiment of the present invention;
fig. 2 is an enlarged view of a point a in fig. 1.
Description of reference numerals:
1. a riving knife; 11. a second threading hole; 2. welding the end; 21. a notch; 22. a first threading hole; 23. a transition hole; 24. a wire guide hole; 25. a working surface.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example (b):
as shown in fig. 1 and 2, a process for processing a deep cavity welding chopper and a knife tip thereof, wherein the chopper 1 is cylindrical, one end of the chopper 1 is a welding end 2 in a frustum pyramid shape, a step-shaped unfilled corner is formed on the end surface of the welding end 2 along the length direction of the chopper 1, and a wire passing hole is formed from the other end of the chopper 1 to the notch 21, the process comprises the following steps:
s1, preparing a compact die, processing a die cavity matched with the shape of the riving knife 1 in the compact die, and arranging a die core matched with the wire penetrating hole in the die cavity;
s2, preparing tungsten powder, and reducing tungsten trioxide by using hydrogen through a reaction furnace to obtain tungsten powder;
s3, forming the cleaver 1, namely placing tungsten powder in a compaction die for compression molding to obtain the cleaver 1;
s4, processing the tool nose of the riving knife 1, wherein the end face of the welding end 2 of the riving knife 1 is a working face 25, performing precise linear cutting on the working face 25 of the riving knife 1, and processing the front face and the side face of the working face 25 of the riving knife 1 into rough faces.
According to the invention, the tungsten powder is laid in a compact die to be pressed to obtain a blank of the chopper 1 and then sintered, so that the structure is stable, the directly usable chopper 1 is obtained by cooling, the powder metallurgy processing technology can save a large amount of cutting materials, the requirement on the processing precision of the chopper 1 is high, the processing difficulty of the machine is high, the rejection rate is reduced by adopting the powder metallurgy processing, and the processing precision of a wire penetrating hole of the chopper 1 is ensured.
The die core in the die is processed according to the size designed by the wire-through 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 the riving knife 1 in the industry.
The working surface 25 of the riving knife 1 is processed by precise linear cutting, and the method has the advantages of high processing precision, convenient processing of the front surface and the side surface of the working surface 25 of the riving knife 1, high processing speed and high working efficiency.
In one embodiment, step S3 specifically includes the following steps:
s31, forming a blank, namely paving tungsten powder in a compact die, and pressing the tungsten powder by the compact die to obtain a blank of the cleaver 1;
s32, strengthening the structure of the riving knife 1, sintering the blank of the riving knife 1 at 1350-1450 ℃ at high temperature to improve the compact performance, and cooling to obtain the riving knife 1.
In one embodiment, the grain size of the tungsten powder is 0.1-1.2 μm.
In one embodiment, step S2 further includes the following steps:
s21, screening out coarse tungsten powder with the grain size larger than 1.2 mu m from the tungsten powder, grinding the coarse tungsten powder until the grain size is smaller than 1.2 mu m, and mixing the coarse tungsten powder with the fine tungsten powder for use.
In one embodiment, step S32 further includes the following steps:
s321, wire guide holes 24 which are used for communicating the end face of the welding end 2 with the notches 21 are machined in the riving knife 1 through high-precision electric spark machining.
The wire guide holes 24 are arranged, so that the gold wires can be guided after penetrating through the wire penetrating holes, excessive exposure of the gold wires outside the welding end 2 is avoided, certain protection is formed on the gold wires, the structure of the wire guide holes 24 is obliquely arranged, and if a mold core mechanism of the wire guide holes 24 is designed in a mold, the riving knife 1 is inconvenient to take out after molding, so that high-precision electric spark machining is adopted after molding, and the cost is low.
In one embodiment, in step S31, the pressure of the compact die during pressing is 500MPa to 1100 MPa.
In one embodiment, as shown in fig. 2, a first wire passing hole 22, a transition hole 23 and a second wire passing hole 11 are arranged in the wire passing hole from the notch 21 to the other end of the riving knife 1, the cross section of the transition hole 23 is in a circular truncated cone shape, and the depth-diameter ratio of the second wire passing hole 11 is greater than 20: 1, the diameter of the second wire-penetrating hole 11 is 0.3mm-0.5 mm.
The riving knife 1 is of a special structure, and if traditional machining is adopted, the machining difficulty is high, and the electric spark machining time is too long, so that the powder metallurgy machining is particularly suitable for mass production of the special riving knife 1.
In one embodiment, the working surface 25 of the riving knife 1 has a roughness of Ra0.2-Ra0.8.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. The utility model provides a process of processing deep cavity welding chopper and knife tip thereof, this chopper is cylindricly, and the one end of chopper is for being the welded end of prismoid form, offers the unfilled corner of step form along the length direction of this chopper on the terminal surface of welded end, and the wire feed hole has been offered to the chopper other end to the breach, its characterized in that includes following step:
s1, preparing a compact die, processing a die cavity matched with the shape of the riving knife in the compact die, and arranging a die core matched with the wire penetrating hole in the die cavity;
s2, preparing tungsten powder, and reducing tungsten trioxide by using hydrogen through a reaction furnace to obtain tungsten powder;
s3, forming a cleaver, namely placing tungsten powder in a compaction die for compression molding to obtain the cleaver;
s4, processing the cutter point of the riving knife, wherein the end face of the welding end of the riving knife is a working face, performing precise linear cutting on the working face of the riving knife, and processing the front face and the side face of the working face of the riving knife into rough faces.
2. The process for machining the deep cavity welding chopper and the knife tip thereof as claimed in claim 1, wherein the step S3 specifically comprises the following steps:
s31, forming a blank, namely paving tungsten powder in a compact die, and pressing the tungsten powder by the compact die to obtain a cleaver blank;
s32, strengthening the structure of the cleaver, sintering the blank of the cleaver at 1350-1450 ℃ at high temperature, and cooling to obtain the cleaver.
3. The process for machining the deep cavity welding cleaver and the tool nose thereof as claimed in claim 1 or 2, wherein the grain size of the tungsten powder is 0.1 μm to 1.2 μm.
4. The process for machining the deep cavity welding chopper and the knife tip thereof as claimed in claim 3, wherein the step S2 further comprises the steps of:
s21, screening out coarse tungsten powder with the grain size larger than 1.2 mu m from the tungsten powder, grinding the coarse tungsten powder until the grain size is smaller than 1.2 mu m, and mixing the coarse tungsten powder with the fine tungsten powder for use.
5. The process for machining the deep cavity welding chopper and the knife tip thereof as claimed in claim 4, wherein the step S32 further comprises the steps of:
s321, wire guide holes for communicating the end face of the welding end with the notch are machined in the riving knife through high-precision electric sparks.
6. The process for manufacturing the deep cavity welding chopper and the knife tip thereof as claimed in claim 5, wherein in the step S31, the pressure of the compact die during pressing is 500MPa-1100 MPa.
7. The process for machining the deep cavity welding chopper and the knife tip thereof as claimed in claim 6, wherein a first wire passing hole, a transition hole and a second wire passing hole which are communicated with each other are arranged in the wire passing hole from the notch to the other end of the chopper, the section of the transition hole is in a circular truncated cone shape, and the depth-diameter ratio of the second wire passing hole is larger than 20: 1, the diameter of the second wire penetrating hole is 0.3mm-0.5 mm.
8. The process for manufacturing the deep cavity welding chopper and the knife tip thereof as claimed in claim 7, wherein the roughness of the working surface of the chopper is Ra0.2-Ra0.8 in the step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911018304.XA CN110961743A (en) | 2019-10-24 | 2019-10-24 | Technology for processing deep cavity welding cleaver and tool point thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911018304.XA CN110961743A (en) | 2019-10-24 | 2019-10-24 | Technology for processing deep cavity welding cleaver and tool point thereof |
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| Publication Number | Publication Date |
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| CN110961743A true CN110961743A (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911018304.XA Withdrawn CN110961743A (en) | 2019-10-24 | 2019-10-24 | Technology for processing deep cavity welding cleaver and tool point thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114986040A (en) * | 2022-07-28 | 2022-09-02 | 有研工程技术研究院有限公司 | Long-life automatic wedge welding cleaver and preparation method thereof |
| CN116553932A (en) * | 2023-07-07 | 2023-08-08 | 有研工程技术研究院有限公司 | Tungsten carbide material for high-reliability wedge welding chopper and production method thereof |
-
2019
- 2019-10-24 CN CN201911018304.XA patent/CN110961743A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114986040A (en) * | 2022-07-28 | 2022-09-02 | 有研工程技术研究院有限公司 | Long-life automatic wedge welding cleaver and preparation method thereof |
| CN116553932A (en) * | 2023-07-07 | 2023-08-08 | 有研工程技术研究院有限公司 | Tungsten carbide material for high-reliability wedge welding chopper and production method thereof |
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Application publication date: 20200407 |