CN115090882B - Semi-burning forming process of cutter head and cutter head formed by adopting process - Google Patents

Semi-burning forming process of cutter head and cutter head formed by adopting process Download PDF

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Publication number
CN115090882B
CN115090882B CN202210702271.6A CN202210702271A CN115090882B CN 115090882 B CN115090882 B CN 115090882B CN 202210702271 A CN202210702271 A CN 202210702271A CN 115090882 B CN115090882 B CN 115090882B
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tool bit
cutter head
semi
finished product
sintering
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CN115090882A (en
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黄启君
饶刚
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Kunshan Changying Hard Material Technology Co ltd
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Kunshan Changying Hard Material Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • 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
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware

Abstract

The application discloses a semi-sintering molding process of a cutter head and the cutter head molded by adopting the process, and belongs to the technical field of cutter heads. The process adopts a formed solid blank, a blank is used for processing a threaded hole to form a semi-finished product, sintering and post-treatment are carried out to form a finished product, wherein a cutter is used for processing threads and matched with a numerical control machine tool, and the matching precision of a finished product cutter head and a guide rod is higher through optimizing processing parameters. The screw hole is formed in the bottom surface of the tool bit formed by the process, and the 180-degree rotationally symmetrical reinforcing protruding blocks are arranged on the peripheral wall of the tool bit main body, so that torque can be well transmitted, the tool bit can stably rotate in the operation process, the machining precision is improved, the strength of the tool bit can be enhanced, and the service life of the tool bit is prolonged; in addition, the arrangement of the guide grooves and the related structures can enable the tool bit to smoothly discharge scraps and other impurities in the operation process.

Description

Semi-burning forming process of cutter head and cutter head formed by adopting process
Technical Field
The application relates to a forming process of a cutter head and the cutter head, in particular to a semi-sintering forming process of the cutter head with a threaded hole and the cutter head formed by adopting the process, and belongs to the technical field of cutter heads.
Background
When the cutter head with the processing hole in the prior art is formed, the adopted forming mode is that firstly, alloy raw materials for the cutter head are placed in a die to be pressed to form a solid cutter head blank, then the solid cutter head blank is subjected to presintering preliminary forming, then the presintered blank is subjected to mechanical processing, such as processing of threads in a threaded hole in a motor discharging mode, to form a semi-finished product, and finally the semi-finished product is subjected to sintering and stress relief treatment to obtain the finished product. In the traditional forming process, a direct-pressure direct-firing process is adopted, the threaded hole is formed by matching with a threaded electrode through subsequent machining, but the machining time is longer when the machining process is adopted, the machining cost is higher, and particularly the service life of the hard alloy can be greatly reduced due to discharge corrosion in the electric discharge machining. Aiming at the technical problems, a forming process which is low in processing cost, short in processing time and free from influencing the service life of the cutter head is needed.
Disclosure of Invention
In order to solve the technical problems, the application provides a semi-burning forming process of a cutter head and the cutter head formed by adopting the process, wherein the forming process has simple steps, controllable operation, high processing precision of the formed cutter head and long service life.
The technical scheme of the application is as follows:
the application discloses a semi-sintering molding process of a cutter head, which mainly comprises the following steps:
preparing a blank: weighing the following components in percentage by mass: 8-12wt.% cobalt, 0.5-1.0wt.% chromium, and the balance tungsten carbide; mixing the components, sequentially performing ball milling, spraying and drying to obtain a cutter head semi-burned raw material, and performing compression molding on the cutter head semi-burned raw material by using a cutter head die to form a blank with a preset shape, wherein the blank is not provided with a thread socket hole;
preparing a semi-finished product: punching a preformed hole on a blank, then punching the hole by a tooth cutter to put the hole in place, and finally performing thread turning to obtain a semi-finished product;
forming a cutter head: and sintering and stress-relieving the semi-finished product to obtain the cutter head.
The further technical scheme is as follows:
when the preformed hole is punched in the preparation of a semi-finished product, the size of the thread bottom hole is subtracted by 0.5mm to be used as the punching size, the feeding depth in the Z-axis direction is 2.5mm each time until reaching the preset depth position, and the feeding amount is 0.03mm/r.
The further technical scheme is as follows:
the feed rate when hole turning was performed in the preparation of the semi-finished product was 0.05mm/r.
The further technical scheme is as follows:
when thread turning is carried out in the preparation of a semi-finished product, a cutter is used as a reference by taking a small diameter of a thread, and the cutter is fed for 0.1mm in the X-axis direction each time until the large diameter is reached, the feeding amount is determined by the tooth pitch size, and the depth is directly in place; and (5) carrying out secondary machining on the 3mm position of the end face of the straight hole after retracting the cutter again until the depth is in place.
The further technical scheme is as follows:
the sintering process for sintering the semi-finished product comprises the steps of sintering at least 5.5MPa, sintering at 1400-1500 ℃ and sintering heat preservation for at least 50min.
The further technical scheme is as follows:
the destressing treatment of the sintered tool bit is a cryogenic treatment, the temperature of the cryogenic treatment is-180+/-10 ℃, and the time of the cryogenic treatment is 3-4 hours.
The application also discloses a cutter head prepared and molded by the molding process, which comprises a cutter head main body, wherein a threaded hole for positioning connection with a cutter bar is formed on the bottom surface of the cutter head main body; a drill point is formed on the top surface of the tool bit main body, and a main cutting edge crossing the top surface of the drill point is formed on the drill point; two reinforcing protruding blocks are formed on the peripheral wall of the cutter head main body, and one reinforcing protruding block is overlapped with the other reinforcing protruding block after rotating 180 degrees around the central axis of the cutter head; the protruding portion of the reinforcing protruding block is formed by intersecting an outer vertical face and an outer inclined face, wherein the outer vertical face is far away from the central axis of the cutter head and forms an outer guide face together with the peripheral wall of the cutter head main body, the outer inclined face is close to the central axis of the cutter head, and a guide groove is formed at the intersection of the bottom of the outer inclined face and the peripheral wall of the cutter head main body along the direction of the central axis of the cutter head.
The further technical scheme is as follows:
the outer guide surface is of an L-shaped structure, two surfaces of the L-shaped structure are planes, and an included angle between the two planes is 100-105 degrees; and wherein the outer elevation slopes away from the central axis of the cutter head from the top-facing bottom surface.
The further technical scheme is as follows:
the outside inclined plane of strengthening protruding piece is 75-80 degrees with outside facade, wherein be close to the bottom face department on the outside facade and form the ladder groove.
The further technical scheme is as follows:
and an inclined plane extending downwards from the top surface to the bottom surface is formed at the intersection of the bottom surface and the peripheral wall of the tool bit main body, and a sector-shaped guiding concave surface is formed on the inclined plane and extends from the bottom end of the guiding groove to the periphery of the threaded hole on the bottom surface.
The beneficial technical effects of the application are as follows:
1. the forming process adopts the process of forming a solid blank, processing a threaded hole by the blank, forming a semi-finished product, sintering and post-processing to form a finished product, wherein the processing of the threaded hole adopts a cutter to be matched with a numerical control machine tool for processing, and the matching precision of a cutter head and a guide rod after forming can be higher through optimized processing parameters; in addition, the forming process can greatly shorten the processing time and improve the processing efficiency, does not have any influence on the performance of the product, and can improve the stability of the product.
2. According to the tool bit molded by the molding process, the threaded hole for connecting with the tool bar is formed on the bottom surface of the tool bit, and the 180-degree rotationally symmetrical reinforcing protruding blocks are arranged on the peripheral wall of the tool bit main body, so that torque can be well transmitted through the structural arrangement of the reinforcing protruding blocks, the tool bit can rotate stably in the operation process, the machining precision is improved, the strength of the tool bit is enhanced, and the service life of the tool bit is further prolonged; in addition, the arrangement of the guide grooves and the related structures can enable the tool bit to smoothly discharge scraps and other impurities in the operation process.
Drawings
FIG. 1 is a schematic perspective view of a tool bit according to the present application;
FIG. 2 is a second perspective view of the tool bit of the application (threads in the threaded bore are not shown);
FIG. 3 is a top view of the tool tip of the present application;
FIG. 4 is a bottom view of the tool tip of the present application (threads within the threaded bore are not shown);
FIG. 5 is a side view of a tool tip according to the present application;
wherein:
1-a cutter head main body;
10-bottom face; 11-a threaded hole;
20-bottom face; 21-a drill point; 22-main cutting edge;
30-a peripheral wall; 31-reinforcing the bump; 311-outer facade; 312-outboard cant; 313-first guide slots; 314-a second guide slot; 315-transition edge; 32-an outer guide surface; 33-a guide groove; 331-first guiding ramp; 332-a second guiding ramp;
40-inclined plane; 41-concave guiding surface.
Detailed Description
In order that the manner in which the above recited features of the present application are attained and can be understood in detail, a more particular description of the application, briefly summarized below, may be had by reference to the appended drawings and examples, which are illustrated in their embodiments, but are not intended to limit the scope of the application.
The following specific embodiments detail a tool bit semi-firing forming process, which mainly comprises the following steps:
preparing a blank: weighing the following components in percentage by mass: 8-12wt.% cobalt, 0.5-1.0wt.% chromium and the balance tungsten carbide (the proportions adopted in different specific examples are not shown in the following table 1), and the above components are put into a ball mill to be subjected to ball milling, spraying and drying in sequence, so that a cutter head semi-burned raw material similar to a spherical particle mixture is obtained, and the raw material has good loose flowability, approximately spherical particle shape and relatively uniform size. After the cutter head semi-burned raw materials are uniformly mixed, the cutter head semi-burned raw materials are placed in a cutter head die and are molded into a blank with a preset shape by adopting a press machine, and the blank is not provided with a thread socket hole. In addition, the blank can be prepared by adopting a static pressure molding mode.
Preparing a semi-finished product: and (3) punching a preformed hole on the blank, wherein when the blank is punched, the size of the thread bottom hole is subtracted by 0.5mm to be used as the punching size, the feeding depth in the Z-axis direction is 2.5mm each time until the blank reaches the preset depth position, and the feeding amount is 0.03mm/r. Then, a dental knife is used for punching the hole to carry out hole punching in place, and the feeding amount during hole punching is 0.05mm/r. Finally, performing programming thread turning to obtain a semi-finished product, taking a small thread diameter as a reference for a cutter during thread turning, feeding 0.1mm in the X-axis direction each time until the large diameter is reached, determining the feeding amount according to the tooth pitch size, and directly positioning the depth; and (5) carrying out secondary machining on the 3mm position of the end face of the straight hole after retracting the cutter again until the depth is in place.
In the preparation of the semi-finished product, the thread processing programming parameters are slightly different according to different specifications, and the size and the depth shape of the bottom hole are slightly different, and the adjustment range is between 0.1 and 0.2 mm. Taking M3 thread machining with depth of 6mm and thread pitch of 0.5mm as an example: adopting conventional processing according to the steps of 3.0mm of large diameter, 2.45mm of small diameter, 6mm of depth and 0.5mm of pitch; according to the material selection in the process and the sintering process in the subsequent tool bit forming, the parameters of the thread processing after adjustment are that the small-diameter opening size is 2.55mm, the small-diameter bottom hole size is 2.75mm and the depth is 7mm.
Forming a cutter head: and sintering and destressing the semi-finished product to obtain the cutter head. Wherein during sintering, the sintering pressure is at least 5.5MPa, the sintering temperature is 1400-1500 ℃, and the sintering heat preservation time is at least 50min. Wherein the temperature of the cryogenic treatment is-180+/-10 ℃ and the time of the cryogenic treatment is 3-4h.
In the prior art, the processes of forming a blank by metal powder compression molding, presintering the blank, machining a hole to form a semi-finished product, sintering and post-treatment to form a finished product adopt direct-compression direct-firing, a threaded hole can only be formed by a subsequent machining mode, and most of threads are formed by adopting a threaded electrode discharge molding mode when the threads are formed by adopting the machining mode, so that the machining time is long, the machining cost is high, and in addition, the service life of hard alloy can be greatly influenced by discharge corrosion. More specifically, the method comprises the following steps: when the prior art is adopted to carry out conventional electrode discharge forming of the threaded hole, the machining time is 20 min/piece, the machining cost is about 20 yuan/piece, and the electrode raw material cost is 30 yuan/piece; and the final end product is about 1H/piece complete.
The forming process adopts the process of forming a solid blank, processing a threaded hole by the blank, forming a semi-finished product, sintering and post-processing to form a finished product, wherein the processing of the threaded hole adopts the processing of a cutter matched with a numerical control machine tool, and the matching precision of a cutter head and a guide rod after forming is higher through optimized processing parameters; in addition, the forming process can greatly shorten the processing time and improve the processing efficiency, does not have any influence on the performance of the product, and can improve the stability of the product. More specifically, the method comprises the following steps: the process of the application takes about 5 min/piece for processing the thread and about 4.12 elements/piece for combined processing cost; in addition, the cutter used is a conventional thread cutter, the cost is 300 yuan/handle, each cutter can process 200 products, and the cost for the folded cutter is 1.5 yuan/piece.
Table 1 cutter head semi-burned raw material proportioning table (unit: wt.)
The above-mentioned ratios in table 1 were used to prepare the bits 1-7 using the molding process of the present application, and the ratios of 1-3 were used to prepare the same shape structure bits using the conventional process mentioned in the background of the present application, which is: firstly, placing alloy raw materials for a cutter head into a die for pressing to form a solid cutter head blank; then, pre-sintering the solid blank of the cutter head for preliminary forming (the pre-sintering temperature is 300-900 ℃), and then, machining a threaded hole and threads on the blank subjected to pre-sintering, wherein the threaded hole is machined in a milling, drilling and other modes, and the threads are formed in an electrode discharge machining mode to form a semi-finished product; finally, sintering the semi-finished product (the sintering temperature is 1360-1490 ℃, the sintering pressure is 0-10MPa, and the sintering time is 24-60 h) to obtain the corresponding finished product cutter head 8-10.
The simulated life test was performed on the heads 1-8 molded by the above process to test the number of uses of the heads, and the results are shown in table 2.
Table 2 shows the results of the tool bit life test (unit: ten thousand times)
Bit number Number of life tests
1 15462
2 14375
3 14736
4 15292
5 7556
6 8462
7 9167
8 10200
9 9820
10 9940
As can be seen from the test results in the table 2, when the cutter head (cutter head 1-4) is formed by adopting the raw material proportioning and forming process, the service life is basically longer than 14000 ten thousand times; the raw material ratio which is not limited by the application is used, but the cutter head (cutter head 5-7) molded by the molding process is also used, and the service life is less than 10000 ten thousand times; the cutter head (cutter head 8-10) formed by the traditional forming process has the service life obviously lower than that of the cutter head formed by the process.
The application also discloses a tool bit prepared and molded by the molding process, which comprises a tool bit main body 1, wherein the tool bit main body 1 is usually fixedly connected with a tool bar. The cutter head main body is of a block-shaped structure similar to a cuboid, the block-shaped structure comprises a bottom surface 10, a top surface 20 opposite to the bottom surface, and a peripheral wall 30 surrounding between the bottom surface and the top surface, wherein the bottom surface 10 is of a plane structure; wherein the top face 20 is a non-planar structure; wherein the peripheral wall 30 includes a long surface and a short surface, the long surface and the short surface are disposed in opposite directions, and the long surface and the short surface are non-planar structures, and the short surface is planar structure. The peripheral wall 30 described in the present application and in this embodiment refers to the oppositely disposed long faces of the approximately rectangular parallelepiped.
In this embodiment, a threaded hole 11 for positioning connection with a cutter bar is formed on the bottom surface 10 corresponding to the central axis of the cutter head, the threaded hole is a blind hole, an annular guiding inclined plane is formed at the opening of the blind hole, and an internal thread matched with an external thread on the guide rod is formed on the inner peripheral wall of the blind hole. The forming process of the threaded hole and the internal thread adopts the forming process described in the technical scheme of the application.
In this embodiment the top surface 20 of the tool bit body 1 is formed with a drill tip 21, the tip 21 having a top angle of 135-145 degrees, and a main cutting edge 22 extending across the top surface of the drill tip, which main cutting edge in this embodiment is a straight edge structure.
Two reinforcing protrusion pieces 31 are formed on the peripheral wall 30 of the bit body 1, one of the reinforcing protrusion pieces overlaps the other reinforcing protrusion piece after rotating 180 degrees around the bit central axis, and the protruding portion of each reinforcing protrusion piece 31 is formed by intersecting one outer side elevation 311 and one outer side inclined surface 312.
The outer vertical surface 311 is far away from the central axis of the cutter head and forms an outer guide surface 32 with an L-shaped structure together with the peripheral wall 30 of the cutter head body, the outer vertical surface 311 and the peripheral wall 30 form two surfaces of the outer guide surface, the two surfaces are planes, and an included angle between the two planes is 100-105 degrees, wherein the outer vertical surface 311 inclines from the top surface to the bottom surface towards the direction far away from the central axis of the cutter head.
Wherein outside inclined plane 312 is located and is close to tool bit central axis side, is 75-80 degrees between outside inclined plane 312 and the outside facade 311, and this outside inclined plane is set up towards tool bit central axis side slope from outside facade "spine" one side, and wherein the juncture of outside facade and outside inclined plane is formed with a transition sword 315, and the contained angle is greater than 80 degrees and is less than 90 degrees between the cutting face of this transition sword and the outside facade, and the setting of this transition sword can increase the intensity of tool bit side blade.
The intersection of the outer inclined surface 312 and the peripheral wall of the tool bit body is formed with a guiding groove 33 which is arranged in a straight line along the central axis direction of the tool bit, the inner wall of the guiding groove is a concave cambered surface, and two sides of the concave cambered surface extend outwards to form a first guiding inclined surface 331 which is intersected with the outer inclined surface and a second guiding inclined surface 332 which is intersected with the peripheral wall of the other half part of the side. Further, a slope 40 extending obliquely downward from the top surface to the bottom surface is formed at the intersection of the bottom surface 10 and the peripheral wall 30 of the head body, and a guide concave surface 41 having a fan shape is formed on the slope extending from the bottom end of the guide groove 33 to the outer periphery of the screw hole on the bottom surface 10. The arrangement of the guide groove can enable the chips and other substances drilled from the drill tip to be smoothly discharged out of the tool bit along with the guide groove, wherein the two guide inclined planes can enable the chips and other impurities to be more concentrated in the guide groove.
The outer inclined surface 311 (including the edge surface of the transition edge) is provided with a first concave guide groove 313 near the bottom surface, and a second concave guide groove 314 is symmetrically formed on the peripheral wall of the other half of the side of the cutter head main body by taking the central axis of the cutter head as a reference, the bottoms of the first guide groove and the second guide groove are both planes, the groove side walls of the first guide groove and the second guide groove are inclined surfaces inclined from the groove top to the groove bottom, the included angle between the groove side walls and the groove bottom is an obtuse angle, and the arrangement of the first guide groove and the second guide groove can lead the cutter head to be convenient for discharging impurities while being less in resistance during operation.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims (8)

1. The tool bit molded by a semi-sintering molding process is characterized in that the tool bit is mainly molded by a process comprising the following steps:
preparing a blank: weighing the following components in percentage by mass: 8-12wt.% cobalt, 0.5-1.0wt.% chromium, and the balance tungsten carbide; mixing the components, sequentially performing ball milling, spraying and drying to obtain a cutter head semi-burned raw material, and performing compression molding on the cutter head semi-burned raw material by using a cutter head die to form a blank with a preset shape, wherein the blank is not provided with a thread socket hole;
preparing a semi-finished product: punching a preformed hole on a blank, then punching the hole by a tooth cutter to put the hole in place, and finally performing thread turning to obtain a semi-finished product;
forming a cutter head: sintering and destressing the semi-finished product to obtain a cutter head;
the formed tool bit comprises a tool bit main body (1), and a threaded hole (11) for positioning connection with a tool bar is formed on the bottom surface (10) of the tool bit main body; a drill tip (21) is formed on the top surface (20) of the tool bit body, and a main cutting edge (22) crossing the top surface of the drill tip is formed on the drill tip; two reinforcing protruding blocks (31) are formed on the peripheral wall (30) of the tool bit main body, and one reinforcing protruding block is overlapped with the other reinforcing protruding block after rotating 180 degrees around the central axis of the tool bit; the convex part of the reinforcing convex block (31) is formed by intersecting an outer vertical surface (311) and an outer inclined surface (312), wherein the outer vertical surface (311) inclines from the top surface to the bottom surface to the direction away from the central axis of the cutter head, and a stepped groove (313) is formed on the outer vertical surface close to the bottom surface; the outer vertical surface (311) is far away from the central axis of the cutter head and forms an outer guide surface (32) with an L-shaped structure together with the peripheral wall of the cutter head main body, the outer inclined surface (312) is close to the central axis of the cutter head, and a guide groove (33) is formed at the intersection of the bottom of the outer inclined surface and the peripheral wall of the cutter head main body along the direction of the central axis of the cutter head in an inward manner;
a slope (40) extending downwards from the top surface to the bottom surface is formed at the intersection of the bottom surface (10) and the peripheral wall (30) of the tool bit body, and a fan-shaped guiding concave surface (41) is formed on the slope and extends from the bottom end of the guiding groove (33) to the periphery of the threaded hole on the bottom surface (10).
2. The tool bit formed by a brown molding process according to claim 1, wherein: when the preformed hole is punched in the preparation of a semi-finished product, the size of the thread bottom hole is subtracted by 0.5mm to be used as the punching size, the feeding depth in the Z-axis direction is 2.5mm each time until reaching the preset depth position, and the feeding amount is 0.03mm/r.
3. The tool bit formed by a brown molding process according to claim 1, wherein: the feed rate when hole turning was performed in the preparation of the semi-finished product was 0.05mm/r.
4. The tool bit formed by a brown molding process according to claim 1, wherein: when thread turning is carried out in the preparation of a semi-finished product, a cutter is used as a reference by taking a small diameter of a thread, and the cutter is fed for 0.1mm in the X-axis direction each time until the large diameter is reached, the feeding amount is determined by the tooth pitch size, and the depth is directly in place; and (5) carrying out secondary machining on the 3mm position of the end face of the straight hole after retracting the cutter again until the depth is in place.
5. The tool bit formed by a brown molding process according to claim 1, wherein: the sintering process for sintering the semi-finished product comprises the steps of sintering at least 5.5MPa, sintering at 1400-1500 ℃ and sintering heat preservation for at least 50min.
6. The tool bit formed by a brown molding process according to claim 1, wherein: the destressing treatment of the sintered tool bit is a cryogenic treatment, the temperature of the cryogenic treatment is-180+/-10 ℃, and the time of the cryogenic treatment is 3-4 hours.
7. The tool bit formed by a brown molding process according to claim 1, wherein: the two faces of the L-shaped structure of the outer guide surface (32) are planes, and the included angle between the two planes is 100-105 degrees.
8. The tool bit formed by a brown molding process according to claim 1, wherein: the outside inclined plane (312) of the reinforcing protruding block (31) is 75-80 degrees with the outside elevation (311).
CN202210702271.6A 2022-06-21 2022-06-21 Semi-burning forming process of cutter head and cutter head formed by adopting process Active CN115090882B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998019813A1 (en) * 1996-11-04 1998-05-14 Seco Tools Ab Tool for chip removing machining
CN1198372A (en) * 1997-04-30 1998-11-11 塞科机床公司 Drill
JP2006007393A (en) * 2004-06-29 2006-01-12 Kyocera Corp Throwaway drill
CN104759664A (en) * 2015-04-21 2015-07-08 成都锋宜精密工具制造有限公司 Self-locking type head-replaceable carbide drill
CN107695618A (en) * 2017-08-22 2018-02-16 九江金鹭硬质合金有限公司 A kind of forming method of carbide alloy screwed hole
CN208592434U (en) * 2018-08-28 2019-03-12 山东托普森金刚石钻头有限公司 A kind of heat-resistant antifriction integral type reinforcing drill bit
CN112195387A (en) * 2020-09-30 2021-01-08 昆山长鹰硬质材料科技股份有限公司 Hard alloy, die-cutting knife roll hard alloy blank and preparation method of die-cutting knife roll hard alloy blank
CN216706063U (en) * 2022-01-05 2022-06-10 昆山长鹰硬质材料科技股份有限公司 Crown tool bit convenient to dismouting

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998019813A1 (en) * 1996-11-04 1998-05-14 Seco Tools Ab Tool for chip removing machining
CN1198372A (en) * 1997-04-30 1998-11-11 塞科机床公司 Drill
JP2006007393A (en) * 2004-06-29 2006-01-12 Kyocera Corp Throwaway drill
CN104759664A (en) * 2015-04-21 2015-07-08 成都锋宜精密工具制造有限公司 Self-locking type head-replaceable carbide drill
CN107695618A (en) * 2017-08-22 2018-02-16 九江金鹭硬质合金有限公司 A kind of forming method of carbide alloy screwed hole
CN208592434U (en) * 2018-08-28 2019-03-12 山东托普森金刚石钻头有限公司 A kind of heat-resistant antifriction integral type reinforcing drill bit
CN112195387A (en) * 2020-09-30 2021-01-08 昆山长鹰硬质材料科技股份有限公司 Hard alloy, die-cutting knife roll hard alloy blank and preparation method of die-cutting knife roll hard alloy blank
CN216706063U (en) * 2022-01-05 2022-06-10 昆山长鹰硬质材料科技股份有限公司 Crown tool bit convenient to dismouting

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