A wedge-shaped splitting knife processing method and a processing splitting knife clamp

Abstract

The application discloses a wedge-shaped wedge tool machining method and a clamp for machining the wedge tool. The wedge-shaped wedge tool machining method comprises the steps of preparing a blank, grinding bed machining, tool tip processing and wedge tool body processing. The wedge tool blank is prepared by adopting an ultra-fine grain tungsten carbide extrusion forming process. A vertical hole is formed in one step during the blank preparation. The blank is clamped and fixed by using a clamp. A precision grinding bed is used to machine a tool handle, a tool body and a tool tip. Other parts of the blank form a wedge tool body. The wedge tool body is clamped and fixed by using a clamp. A focused ion beam is used to cut and etch from the tool tip part to form a first inclined hole, a second inclined hole and an arc-shaped groove. The wedge tool body is clamped and fixed by using a clamp. A focused ion beam is used to cut and etch from the upper part of the wedge tool body to form a guide hole. In the application, the vertical hole is formed in one step. The process of EDM machining, polishing and polishing of the vertical hole is omitted. The efficiency is higher. The machining precision and stability are more easily guaranteed. Mass production is facilitated.

Description

Technical Field

[0001] This invention relates to the field of cleaver processing technology, and in particular to a method for processing wedge-shaped cleavers and a fixture for processing cleavers. Background Technology

[0002] In chip packaging, the connection between the chip and the lead frame (substrate) provides the circuit connection for power and signal distribution. Wire bonding is a process that achieves this circuit connection. During the wire bonding process, the bonding wire passing through the wedge generates pressure and friction between the wedge tip and the pad metal. Therefore, wedges are usually made of materials with high hardness and toughness.

[0003] The current cleaver is mainly for Figures 1-5 The form shown mainly includes a cleaver body 1, a handle 2, a blade 3, and a blade tip 4. A guide port 5 is provided on the upper part of the cleaver body 1 to guide the bonding wire through. A vertical hole 6 is provided in the middle of the cleaver body 1, the handle 2, and the blade 3 to guide the bonding wire. The vertical hole 6 is connected to the guide port 5. A first oblique hole 7 and a second oblique hole 8 are provided in the middle of the blade tip 4. The first oblique hole 7 is funnel-shaped and guides the bonding wire leading out from the vertical hole. The second oblique hole 8 fixes the bonding wire, and an arc-shaped groove 9 is provided at the part of the blade tip 4 near the outlet of the second oblique hole 8.

[0004] Wedge-shaped wedges are typically made of hard and brittle materials such as cemented carbide, titanium alloys, and ceramics. Due to the hardness and brittleness of the wedge material, its small microstructure, high precision requirements, and high machining quality requirements, wedge machining is extremely difficult. In the production process, the wedge's external structure is usually CNC machined, but the depth-to-diameter of the wire-threading hole on the wedge is relatively large, making it difficult for CNC drilling equipment to meet the required precision. Therefore, existing methods use electrical discharge machining (EDM) to machine the wire-threading hole. A publication titled "A Deep Cavity Welding Wedge for Welding Gold Strips and Its Manufacturing Process," with publication number "CN110640413A," discloses a manufacturing process for a deep cavity welding wedge for welding gold strips, using high-precision EDM to machine the gold strip fixing hole. While this achieves the desired machining objective, and EDM can achieve the required depth-to-diameter ratio and precision, EDM is time-consuming and requires a large amount of consumable material for the tool electrodes, making it unsuitable for mass production of wedges in factories.

[0005] MPP company announced a wedge processing method using EDM. But there are the following shortcomings in the EDM method: 1, after the EDM method is processed, a subsequent polishing process is needed. 2, the EDM method can only process conductive materials, if you want to process ceramic wedge, you need to add conductive powder, which is troublesome. 3, EDM method needs to design special electrode wire, electrode wire is easy to wear, maintenance cost is high. 4, it is difficult to guarantee the machining precision of 0.05mm micro hole of wedge tip processed by EDM, and the broken hole situation is easy to appear. SUMMARY

[0006] (1) Technical problems to be solved

[0007] The present application can solve the problems of large consumption of existing EDM processing, time-consuming, not conducive to mass production, polishing required by EDM processing method, troublesome operation, high maintenance cost and difficult to guarantee the machining precision and easy to appear broken hole situation.

[0008] (2) Technical solutions

[0009] In order to achieve the above purpose, on the one hand, the present application adopts the following technical scheme, a wedge processing method, specifically comprising the following steps:

[0010] S1, preparing blank: using ultra-fine grain tungsten carbide extrusion forming process to prepare wedge blank, once forming vertical hole during blank preparation;

[0011] S2, grinding machine processing: clamping and fixing the blank with clamp, using precision grinding machine to process handle, body and tip, and the other parts of the blank form the main body of the wedge;

[0012] S3, tip processing: clamping and fixing the wedge main body with clamp, using focused ion beam to cut and etch from the tip part, forming first inclined hole, second inclined hole and arc slot;

[0013] S4, wedge main body processing: clamping and fixing the wedge main body with clamp, using focused ion beam to cut and etch from the upper part of the wedge main body, forming guide hole.

[0014] As a preferred technical scheme of the present application, in S1, the specific steps of preparing blank are:

[0015] S11, mixing powder: mixing 0.6-0.8 particle size of ultra-fine grain Wc90%, Co10% uniformly to obtain wedge raw material;

[0016] S12, forming: the mold itself has a middle column forming a vertical hole, the wedge raw material is injected into the mold to form a semi-finished product with a vertical hole once;

[0017] S13, sintering: sintering the semi-finished product at 1200-1300 DEG C to obtain the chopper blank.

[0018] As a preferred technical solution of the present application, in S3, the specific steps of the tip processing are:

[0019] S31, the chopper body is clamped and fixed by a clamp, and then installed in the SEM / EBIC system, ensuring that the distance between the tip surface and the detector is 9-11 mm;

[0020] S32, the scanning speed is set to 0.45-0.55 mm / s, the acceleration voltage is set to 4900-5100 V, the resolution is set to 4.5-5.5 nm, and the energy of the focused ion beam is set to 19-21 keV;

[0021] S33, the focused ion beam is aligned with the tip part, and processed according to the predetermined processing path, the ion beam penetrates the tip surface and dissipates energy, cuts and etches the material from the tip surface, forms a small hole, records the processing depth and processing time, and finally forms a first inclined hole, a second inclined hole and an arc-shaped groove;

[0022] S34, the size and quality of the first inclined hole, the second inclined hole and the arc-shaped groove are checked by using an electron microscope, and the size and quality are qualified to obtain the finished product, otherwise continue S33 and S34.

[0023] As a preferred technical solution of the present application, in S4, the specific steps of the chopper body processing are:

[0024] S41, the chopper body is clamped and fixed by a clamp, and then installed in the SEM / EBIC system, ensuring that the distance between the chopper body surface and the detector is 9-11 mm;

[0025] S42, the scanning speed is set to 0.45-0.55 mm / s, the acceleration voltage is set to 4900-5100 V, the resolution is set to 4.5-5.5 nm, and the energy of the focused ion beam is set to 19-21 keV;

[0026] S43, the focused ion beam is aligned with the chopper body part, and processed according to the predetermined processing path, the ion beam penetrates the chopper body surface and dissipates energy, cuts and etches the material from the chopper body surface, forms a small hole, records the processing depth and processing time, and finally forms a guide hole;

[0027] S44, the size and quality of the guide hole are checked by using an electron microscope, and the size and quality are qualified to obtain the finished product, otherwise continue S43 and S44.

[0028] As a preferred technical solution of the present application, in S31 and S41, the detector uses a secondary electron detector.

[0029] Further, the application also provides a clamp for processing wedge-shaped splitting knives, which is used for clamping and fixing materials in the wedge-shaped splitting knife processing method, and comprises a cylinder base, a shell connected to the upper part of the cylinder base, and a cylinder arranged in the cylinder base, wherein the output end of the cylinder is provided with a connecting frame, the upper part of the connecting frame is provided with a sleeve ring, the inner part of the shell is provided with a supporting frame, the upper center of the supporting frame is provided with a chuck, and the inner wall of the sleeve ring is in abutment with the outer wall of the chuck.

[0030] As a preferred technical scheme of the application, the side part of the sleeve ring is provided with a guide block, and the inner part of the shell is provided with a sliding groove matched with the guide block.

[0031] As a preferred technical scheme of the application, the upper part of the shell is provided with a cover plate, and the cover plate covers the upper part of the sliding groove.

[0032] As a preferred technical scheme of the application, the chuck comprises a threaded column screw-connected to the middle part of the supporting frame, a plurality of clamping blocks arranged on the upper part of the threaded column, a contraction channel formed between the side walls of the plurality of clamping blocks, and a groove hole for accommodating materials formed between the plurality of clamping blocks.

[0033] As a preferred technical scheme of the application, the outer walls of the plurality of clamping blocks are arranged in an arc shape with the upper part larger and the lower part smaller.

[0034] (Three) beneficial effects

[0035] 1. The wedge-shaped splitting knife processing method provided by the application adopts an ultra-fine grain tungsten carbide extrusion forming process to prepare a splitting knife blank, and a vertical hole is formed at one time during the preparation of the blank, so that the processes of EDM processing and polishing of the vertical hole can be omitted.

[0036] 2. The wedge-shaped splitting knife processing method provided by the application adopts focused ion beam cutting and etching for both the knife tip processing and the splitting knife body processing, so that the processing precision and stability are more easily ensured, and the whole is convenient for mass production.

[0037] 3. The clamp for processing splitting knives provided by the application drives the connecting frame and the sleeve ring to ascend and descend by the cylinder, drives the chuck to close and open, clamps and fixes the materials by the closed chuck, and releases the materials by the opened chuck, so that the needs of clamping and fixing at each stage of splitting knife processing can be met, the stability of clamping is higher, and the subsequent processing of the splitting knife is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope, and other related drawings can also be obtained by those of ordinary skill in the art without any creative effort based on these drawings.

[0039] Figure 1 is a prior art split blade axonometric view;

[0040] Figure 2 is a prior art split blade first perspective view;

[0041] Figure 3 is a prior art split blade second perspective view;

[0042] Figure 4 is a prior art split blade third perspective view;

[0043] Figure 5 is Figure 4 is an enlarged view of A in figure

[0044] Figure 6 is a schematic view of the clamp part structure of the present application;

[0045] Figure 7 is a schematic view of the clamp part structure section of the present application;

[0046] Figure 8 is a schematic view of the shell part structure of the present application;

[0047] Figure 9 is a schematic view of the guide block part structure of the present application;

[0048] Figure 10 is a schematic view of the chuck part structure of the present application.

[0049] In the drawings: 1, split blade main body; 2, blade handle; 3, blade body; 4, blade tip; 5, guide opening; 6, vertical hole; 7, first inclined hole; 8, second inclined hole; 9, arc-shaped groove; 10, cylinder seat; 11, shell; 111, sliding groove; 112, cover plate; 12, cylinder; 13, connecting frame; 14, sleeve ring; 141, guide block; 15, support frame; 16, chuck; 161, threaded column; 162, clamping block; 163, contraction channel; 164, slot hole.

[0050] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0051] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0052] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0053] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0054] In the description of the present application, it should be understood that the terms "longitudinal", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0055] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0056] Embodiment 1

[0057] As Figures 1 to 5 shown, a wedge-shaped chopper processing method specifically includes: S1, preparing a blank: using an ultra-fine grain tungsten carbide extrusion forming process to prepare a chopper blank, during the preparation of the blank, a vertical hole 6 is formed at one time.

[0058] S2, grinding machine processing: using a clamp to clamp and fix the blank, using a precision grinding machine to process the handle 2, the blade body 3 and the blade tip 4, and the other parts of the blank form the chopper main body 1;

[0059] S3, tip processing: the cleaver body 1 is clamped and fixed by a clamp, and a focused ion beam is used to cut and etch from the tip 4 part to form a first inclined hole 7, a second inclined hole 8 and an arc-shaped groove 9;

[0060] S4, cleaver body processing: the cleaver body 1 is clamped and fixed by a clamp, and a focused ion beam is used to cut and etch from the upper part of the cleaver body 1 to form a guide hole 5.

[0061] The specific steps of preparing the blank can be further divided into: S11, powder mixing: super-fine crystal Wc90%, Co10% with a particle size of 0.6-0.8 is mixed uniformly to obtain cleaver raw material;

[0062] S12, forming: the mold itself has a middle column forming a vertical hole 6, the cleaver raw material is injected into the mold to form a semi-finished product with a vertical hole 6 after demolding;

[0063] S13, sintering: sintering the semi-finished product at 1200-1300℃ to obtain the cleaver blank.

[0064] The specific steps of tip processing are: S31, the cleaver body 1 is clamped and fixed by a clamp, and the tip 4 part is exposed after clamping, then installed in the SEM / EBIC system, ensuring that the distance between the surface of the tip 4 and the detector is 9-11mm, and the detector uses a secondary electron detector;

[0065] S32, the scanning speed is set to 0.45-0.55mm / s, the acceleration voltage is set to 4900-5100V, the resolution is set to 4.5-5.5nm, and the energy of the focused ion beam is set to 19-21keV;

[0066] S33, the focused ion beam is aligned with the tip part, and processed according to the predetermined processing path, the ion beam penetrates the surface of the tip 4 and dissipates energy, cutting and etching the material from the surface of the tip 4 to form a small hole, recording the processing depth and processing time, and finally forming a first inclined hole 7, a second inclined hole 8 and an arc-shaped groove 9;

[0067] S34, the size and quality of the first inclined hole 7, the second inclined hole 8 and the arc-shaped groove 9 are checked by using an electron microscope, and the size and quality are qualified to obtain a finished product, otherwise continue S33 and S34 until the finished product meets the requirements.

[0068] The specific steps of cleaver body processing are basically the same as those of tip processing, but there are slight differences, and the specific steps of cleaver body processing are:

[0069] S41, the cleaver body 1 is clamped and fixed by a clamp, and a section away from the tip 4 is exposed after clamping, then installed in the SEM / EBIC system, ensuring that the distance between the surface of the cleaver body 1 and the detector is 9-11mm, and the detector uses a secondary electron detector;

[0070] S42, the scanning speed is set to 0.45-0.55 mm / s, the acceleration voltage is set to 4900-5100 volts, the resolution is set to 4.5-5.5 nm, and the energy of the focused ion beam is set to 19-21 keV;

[0071] S43, the focused ion beam is aligned with the part of the wedge body 1, and is processed according to the predetermined processing path, the ion beam penetrates the surface of the wedge body 1 and dissipates energy, cuts and etches the material from the surface of the wedge body 1, forms a small hole, records the processing depth and processing time, and finally forms a guide port 5;

[0072] S44, the size and quality of the guide port 5 are checked by using an electron microscope, and if the size and quality are qualified, the finished product is obtained, otherwise S43 and S44 are continued.

[0073] In addition, please refer to Figures 6-10 , the present application further provides a clamp for processing a wedge, which is used for clamping and fixing the material in the wedge processing method, and comprises a cylinder seat 10, a shell 11 connected to the upper part of the cylinder seat 10, and a cylinder 12 arranged in the cylinder seat 10. The output end of the cylinder 12 is provided with a connecting frame 13, the upper part of the connecting frame 13 is provided with a sleeve ring 14, the inside of the shell 11 is provided with a supporting frame 15, the upper center of the supporting frame 15 is provided with a chuck 16, and the inner wall of the sleeve ring 14 is in abutment with the outer wall of the chuck 16. The cylinder 12 drives the connecting frame 13 and the sleeve ring 14 to ascend and descend, drives the chuck 16 to close and open, clamps and fixes the material when the chuck 16 is closed, and releases the material when the chuck 16 is opened.

[0074] In the design, in order to ensure the accuracy of movement and reduce the deviation, guide blocks 141 are arranged on the side of the sleeve ring 14, and sliding grooves 111 matched with the guide blocks 141 are arranged in the inside of the shell 11. Of course, the guide blocks 141 and the corresponding sliding grooves 111 can be provided with two or more than two to achieve better guiding effect. In order to prevent the movement range of the guide blocks 141 from being too large, a cover plate 112 is arranged on the upper part of the shell 11, which covers the upper part of the sliding groove 111.

[0075] Please refer to Figure 10 , the chuck 16 comprises a threaded column 161 screwed into the middle part of the supporting frame 15, a plurality of clamping blocks 162 arranged on the upper part of the threaded column 161, a contraction channel 163 formed between the side walls of the plurality of clamping blocks 162, a slot hole 164 for accommodating the material formed between the plurality of clamping blocks 162, and an arc-shaped outer wall of the plurality of clamping blocks 162 arranged in a large size downward small size, so as to facilitate the subsequent closing or opening of the clamping blocks 162 under the action of the sleeve ring 14.

[0076] In summary: the present application adopts the extrusion forming process of superfine grain tungsten carbide to prepare the split knife blank, during the preparation of the blank, the vertical hole 6 is formed at one time, and the processes of EDM processing, polishing and polishing of the vertical hole can be omitted;

[0077] The tool tip 4 processing and the split knife body 1 processing are both cut and etched by using the focused ion beam, and the machining precision and stability are more easily ensured, and the whole is convenient for mass production.

[0078] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of wedge kerfing, characterized by: Specifically comprising the following steps: S1, blank preparation: using ultra-fine grain tungsten carbide extrusion forming process to prepare the wedge blade blank, during the preparation of the blank, a vertical hole (6) is formed at one time; S2, grinding machine processing: using a clamp to clamp and fix the blank, using a precision grinding machine to process the handle (2), the blade body (3) and the blade tip (4), and the other parts of the blank form the wedge blade body (1); S3, blade tip processing: using a clamp to clamp and fix the wedge blade body (1), using a focused ion beam to cut and etch from the blade tip (4) part, forming a first inclined hole (7), a second inclined hole (8) and an arc-shaped groove (9); S4, wedge blade body processing: using a clamp to clamp and fix the wedge blade body (1), using a focused ion beam to cut and etch from the upper part of the wedge blade body (1), forming a guide port (5); In S3, the specific steps of blade tip processing are: S31, clamp and fix the wedge blade body (1) with a clamp, then install it in the SEM / EBIC system, ensure that the distance between the surface of the blade tip (4) and the detector is 9-11 mm; S32, set the scanning speed to 0.45-0.55 mm / s, set the acceleration voltage to 4900-5100 V, set the resolution to 4.5-5.5 nm, and set the energy of the focused ion beam to 19-21 keV; S33, align the focused ion beam with the blade tip part, process according to the predetermined processing path, the ion beam penetrates the surface of the blade tip (4) and dissipates energy, cuts and etches the material from the surface of the blade tip (4), forms a small hole, records the processing depth and processing time, and finally forms a first inclined hole (7), a second inclined hole (8) and an arc-shaped groove (9); S34, use an electron microscope to check the size and quality of the first inclined hole (7), the second inclined hole (8) and the arc-shaped groove (9), if the size and quality are qualified, the finished product is obtained, otherwise continue S33 and S34; In S4, the specific steps of wedge blade body processing are: S41, clamp and fix the wedge blade body (1) with a clamp, then install it in the SEM / EBIC system, ensure that the distance between the surface of the wedge blade body (1) and the detector is 9-11 mm; S42, set the scanning speed to 0.45-0.55 mm / s, set the acceleration voltage to 4900-5100 V, set the resolution to 4.5-5.5 nm, and set the energy of the focused ion beam to 19-21 keV; S43, align the focused ion beam with the wedge blade body (1) part, process according to the predetermined processing path, the ion beam penetrates the surface of the wedge blade body (1) and dissipates energy, cuts and etches the material from the surface of the wedge blade body (1), forms a small hole, records the processing depth and processing time, and finally forms a guide port (5); S44, use an electron microscope to check the size and quality of the guide port (5), if the size and quality are qualified, the finished product is obtained, otherwise continue S43 and S44.

2. A method according to claim 1, wherein: In S1, the specific steps of preparing the blank are: S11, mix the powder: mix 0.6-0.8 micron ultra-fine grain Wc90%, Co10% uniformly to obtain the wedge blade raw material; S12, forming: the mold itself has a middle column forming a vertical hole (6), the cleaver raw material is injected into the mold to form a semi-finished product with a vertical hole (6) after demolding; S13, sintering: sintering the semi-finished product at 1200-1300℃ to obtain the cleaver blank.

3. The method of claim 1 wherein: In the S31 and the S41, the detector adopts a secondary electron detector.

4. A clamp for processing a wedge-shaped parting tool, which is used to achieve the material clamping and fixing in the wedge-shaped parting tool processing method according to claim 1, characterized in that: The clamp comprises a cylinder base (10), a shell (11) connected to the upper part of the cylinder base (10), and a cylinder (12) arranged inside the cylinder base (10), the output end of the cylinder (12) is provided with a connecting frame (13), the upper part of the connecting frame (13) is provided with a sleeve ring (14), the inside of the shell (11) is provided with a supporting frame (15), the upper center of the supporting frame (15) is provided with a chuck (16), and the inner wall of the sleeve ring (14) abuts against the outer wall of the chuck (16); the cylinder (12) drives the connecting frame (13) and the sleeve ring (14) to ascend and descend, drives the chuck (16) to close and open, the chuck (16) closes to clamp and fix the material, and the chuck (16) opens to release the material.

5. A clamp for machining a wedge according to claim 4, characterized in that: The side of the sleeve ring (14) is provided with a guide block (141), and the inside of the shell (11) is provided with a sliding groove (111) matched with the guide block (141).

6. A clamp for machining a wedge according to claim 5, characterized in that: The upper part of the shell (11) is provided with a cover plate (112), and the cover plate (112) blocks the upper part of the sliding groove (111).

7. A clamp for machining a wedge according to any one of claims 4-6, characterized in that: The chuck (16) comprises a threaded column (161) screwedly installed in the middle part of the supporting frame (15), a plurality of clamping blocks (162) arranged on the upper part of the threaded column (161), a contraction channel (163) formed between the side walls of the plurality of clamping blocks (162), and a groove (164) for accommodating the material formed between the plurality of clamping blocks (162).

8. A clamp for machining a wedge according to claim 7, characterized in that: The outer walls of the plurality of clamping blocks (162) are arranged in an arc shape which is large at the top and small at the bottom.

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