CN217395349U - Drill bit for processing brittle and hard materials - Google Patents
Drill bit for processing brittle and hard materials Download PDFInfo
- Publication number
- CN217395349U CN217395349U CN202222008429.8U CN202222008429U CN217395349U CN 217395349 U CN217395349 U CN 217395349U CN 202222008429 U CN202222008429 U CN 202222008429U CN 217395349 U CN217395349 U CN 217395349U
- Authority
- CN
- China
- Prior art keywords
- cutter
- face
- knife
- brittle
- cutting edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Drilling Tools (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The utility model discloses a drill bit for processing brittle and hard materials, which relates to the technical field of processing brittle and hard materials, and comprises a polycrystalline diamond cutter head and a cutter body, wherein the first end of the cutter body is connected with a driving device and can be driven by the driving device to rotate; the second end of the polycrystalline diamond cutter head is fixed on the second end of the cutter body in a protruding mode, the second end of the polycrystalline diamond cutter head is provided with a first cutting edge and a second cutting edge, and the first cutting edge and the second cutting edge are both in contact with the brittle and hard material and can enable the brittle and hard material to be extruded and crushed to form a drill hole; the polycrystalline diamond cutter head is provided with a first peripheral edge and a second peripheral edge, the first peripheral edge and the second peripheral edge are on the same cylindrical surface, the diameter of the cylindrical surface is equal to the expected diameter of the drill hole, and the center line of the cylindrical surface is collinear with the center line of the polycrystalline diamond cutter head; thereby the utility model provides a drill bit life for processing brittle and hard material is longer to drilling machining precision is higher.
Description
Technical Field
The utility model relates to a brittle and hard material processing technology field especially relates to a drill bit for processing brittle and hard material.
Background
Brittle and hard materials, which are generally high in hardness, high in brittleness, and low in fracture toughness, are often non-metals. Some brittle and hard materials are gradually used by people to manufacture some special precision parts due to the excellent heat insulation, insulation and corrosion resistance characteristics, and a drill with high machining precision and long service life does not exist at present to meet the drilling machining requirement of the brittle and hard materials.
Because the processing characteristics of the brittle and hard material are similar to those of the stone, people can easily think that the brittle and hard material is drilled by using a drilling tool (a sintered diamond drill bit) for processing the stone, although the drilling capability and the service life of the sintered diamond drill bit can basically meet the drilling processing requirements of the brittle and hard material, the sintered diamond drill bit is prepared by directly fixing large-particle diamond powder on a tool body in a brazing mode, the tool is not fine enough, so that the size precision of a drill hole processed on the brittle and hard material by using the sintered diamond drill bit is often not high enough, and the sintered diamond drill bit can only be used for roughly processing the hole of the brittle and hard material; in order to ensure the machining precision of the hole, people usually utilize a hard alloy drill bit to perform finish machining to realize precise control of the size of the hole, and although the hard alloy drill bit can realize higher drilling machining precision, the service life of the hard alloy drill bit cannot meet the use expectation of people.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a drill bit for processing brittle and hard material to solve the problem that above-mentioned prior art exists, drilling machining precision is higher, and life is longer.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a drill bit for processing brittle and hard materials, which comprises a polycrystalline diamond cutter head and a cutter body, wherein the first end of the cutter body is used for being connected with a driving device and can be driven by the driving device to rotate, and the first end of the polycrystalline diamond cutter head is fixedly arranged on the second end of the cutter body; the second end of the polycrystalline diamond cutter head is used for protruding and fixing the second end of the cutter body and extending in the direction far away from the cutter body, the second end of the polycrystalline diamond cutter head is provided with a first cutting edge and a second cutting edge, the first cutting edge and the second cutting edge are both used for being in contact with brittle and hard materials and enabling the brittle and hard materials to be extruded and crushed to form a drill hole, an included angle between the first cutting edge and the second cutting edge is larger than 90 degrees, the first end of the first cutting edge is used for being connected with the first end of the second cutting edge, the second end of the first cutting edge is used for extending in the direction close to the cutter body, and the second end of the second cutting edge is used for extending in the direction close to the cutter body; the polycrystalline diamond tool bit is provided with a first peripheral edge and a second peripheral edge, the first peripheral edge and the second peripheral edge are used for being in contact with the side wall of the drill hole, the first peripheral edge and the second peripheral edge are on the same cylindrical surface, the diameter of the cylindrical surface is used for being equal to the expected diameter of the drill hole, and the center line of the cylindrical surface is collinear with the center line of the polycrystalline diamond tool bit.
Preferably, the first cutting edge and the second cutting edge are symmetrical about a center line of the polycrystalline diamond segment.
Preferably, the second end of the polycrystalline diamond tip has a first face, a second face, a third face, and a fourth face; the first knife face and the second knife face are intersected to form the first knife edge, one end, far away from the first knife edge, of the first knife face is used for extending towards the direction close to the knife body, and one end, far away from the first knife edge, of the second knife face is used for extending towards the direction close to the knife body; the third knife face and the fourth knife face are intersected to form the second knife edge, one end, far away from the second knife edge, of the third knife face is used for extending towards the direction close to the knife body, and one end, far away from the second knife edge, of the fourth knife face is used for extending towards the direction close to the knife body.
Preferably, first cutting edge with the second cutting edge is located first plane jointly, first knife face with contained angle between the first plane is 20~60 degrees, the second knife face with contained angle between the first plane is 20~60 degrees, the third knife face with contained angle between the first plane is 20~60 degrees, the fourth knife face with contained angle between the first plane is 20~60 degrees.
Preferably, the first knife face with contained angle between the first plane is 30 degrees, the second knife face with contained angle between the first plane is 45 degrees, the third knife face with contained angle between the first plane is 30 degrees, the fourth knife face with contained angle between the first plane is 45 degrees.
Preferably, the second end of the cutter body is provided with a mounting groove, and the first end of the polycrystalline diamond cutter head is fixedly embedded in the mounting groove.
Preferably, the second end of the tool body has a fifth facet, a sixth facet, a seventh facet, and an eighth facet thereon, the fifth facet being for being coplanar with the first facet, the sixth facet being for being coplanar with the second facet, the seventh facet being for being coplanar with the third facet, the eighth facet being for being coplanar with the fourth facet.
Preferably, the second end of the cutter body is provided with a first chip guide groove and a second chip guide groove, the first chip guide groove is used for communicating the space above the first cutter face in the drill hole with the outside, and the second chip guide groove is used for communicating the space above the third cutter face in the drill hole with the outside.
Preferably, the cutter body is a cemented carbide body.
The utility model discloses for prior art gain following technological effect:
the utility model provides a drill bit for processing brittle and hard materials, through adopting polycrystalline diamond tool bit, compare the carbide drill bit among the prior art and have promotion in the aspect of the wearability of material; the method comprises the steps that a first blade and a second blade are arranged to be in contact with a brittle and hard material and can enable the brittle and hard material to be extruded and crushed to form a drill hole, specifically, the first blade and the second blade are used for transmitting axial pressure to the brittle and hard material, large local compressive stress is formed on the brittle and hard material at the contact position of the first blade and the second blade, so that the brittle and hard material is subjected to micro-fracture, and the first blade and the second blade scrape the fractured brittle and hard material along with the rotating motion of a cutter body to form the drill hole; by arranging the included angle between the first cutting edge and the second cutting edge to be larger than 90 degrees, stress concentration on the polycrystalline diamond cutter head in the process of extruding the brittle and hard material can be reduced; compared with the sintered diamond drill bit which is directly fixed with large-grain diamond powder on a cutter body in the prior art in a brazing mode, the utility model provides a drill bit for processing brittle and hard materials is through setting up the first peripheral edge and the second peripheral edge on the polycrystalline diamond cutter head, and specifically set up the contact of the side wall of the first peripheral edge and the second peripheral edge and drilling, the diameter of the cylindrical surface where the first peripheral edge and the second peripheral edge are located is equal to the expected diameter of the drilling hole and the center line of the cylindrical surface is collinear with the center line of the polycrystalline diamond cutter head, thereby being capable of increasing the stability of the polycrystalline diamond cutter head in the drilling processing process and ensuring the diameter size precision of the drilling hole, so that the diameter of the processed drilling hole can reach the expected diameter; thereby the utility model provides a drill bit life for processing brittle and hard material is longer to drilling machining precision is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic front view of a drill bit for processing brittle and hard materials provided by the present invention;
FIG. 2 is a schematic top view of the drill bit for machining brittle and hard materials of FIG. 1;
FIG. 3 is a left side view of the drill bit for machining brittle and hard materials in FIG. 1;
fig. 4 is a schematic structural diagram of a mounting position of a polycrystalline diamond segment of the drill bit for machining brittle and hard materials in fig. 1.
In the figure: 100-a drill bit for processing brittle and hard materials, 1-polycrystalline diamond tool bit, 2-a cutter body, 3-a first cutting edge, 4-a second cutting edge, 5-a first peripheral edge, 6-a second peripheral edge, 7-a first cutter face, 8-a second cutter face, 9-a third cutter face, 10-a fourth cutter face, 11-a fifth cutter face, 12-a sixth cutter face, 13-a seventh cutter face, 14-an eighth cutter face, 15-a first chip guide groove and 16-a second chip guide groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a drill bit for processing brittle and hard material to solve the problem that above-mentioned prior art exists, drilling machining precision is higher, and life is longer.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1-4, the present invention provides a drill bit 100 for processing brittle and hard materials, comprising a polycrystalline diamond tool bit 1 and a tool body 2, wherein a first end of the tool body 2 is connected to a driving device and can be driven by the driving device to rotate, and a first end of the polycrystalline diamond tool bit 1 is fixedly disposed on a second end of the tool body 2; the second end of the polycrystalline diamond cutter head 1 is used for protruding and fixing the second end of the cutter body 2 and extending in the direction far away from the cutter body 2, the second end of the polycrystalline diamond cutter head 1 is provided with a first cutter blade 3 and a second cutter blade 4, the first cutter blade 3 and the second cutter blade 4 are both used for being in contact with brittle and hard materials and enabling the brittle and hard materials to be extruded and crushed to form a drill hole, an included angle between the first cutter blade 3 and the second cutter blade 4 is larger than 90 degrees, the first end of the first cutter blade 3 is used for being connected with the first end of the second cutter blade 4, the second end of the first cutter blade 3 is used for extending in the direction close to the cutter body 2, and the second end of the second cutter blade 4 is used for extending in the direction close to the cutter body 2; the polycrystalline diamond cutter head 1 is provided with a first peripheral edge 5 and a second peripheral edge 6, the first peripheral edge 5 and the second peripheral edge 6 are used for being in contact with the side wall of the drill hole, the first peripheral edge 5 and the second peripheral edge 6 are on the same cylindrical surface, the diameter of the cylindrical surface is used for being equal to the expected diameter of the drill hole, and the center line of the cylindrical surface is collinear with the center line of the polycrystalline diamond cutter head 1.
Therefore, the drill bit 100 for processing brittle and hard materials provided by the utility model has the advantages that by adopting the polycrystalline diamond tool bit 1, compared with the hard alloy drill bit in the prior art, the wear resistance of the material is improved; the first blade 3 and the second blade 4 are arranged to be in contact with the brittle and hard material and can crush the brittle and hard material to form a drill hole, specifically, the first blade 3 and the second blade 4 are used for transmitting axial pressure to the brittle and hard material, large local compressive stress is formed on the brittle and hard material at the contact position of the first blade 3 and the second blade 4, so that the brittle and hard material is subjected to micro-fragmentation, and the first blade 3 and the second blade 4 scrape the fragmented brittle and hard material down along with the rotating motion of the cutter body 2 to form the drill hole; by arranging the included angle between the first cutting edge 3 and the second cutting edge 4 to be larger than 90 degrees, the stress concentration on the polycrystalline diamond cutter head 1 in the process of extruding the brittle and hard material can be reduced; compared with the sintered diamond drill bit which is made by directly fixing large-grain diamond powder on a cutter body 2 in a brazing mode in the prior art, the utility model provides a drill bit 100 for processing brittle and hard materials is through setting up a first peripheral edge 5 and a second peripheral edge 6 on a polycrystalline diamond cutter head 1, and specifically sets up the contact of the first peripheral edge 5 and the second peripheral edge 6 with the side wall of a drill hole, the diameter of the cylindrical surface where the first peripheral edge 5 and the second peripheral edge 6 are located is equal to the expected diameter of the drill hole and the center line of the cylindrical surface is collinear with the center line of the polycrystalline diamond cutter head 1, so that the stability of the polycrystalline diamond cutter head 1 in the drilling processing process can be increased, the diameter size precision of the drill hole can be ensured, and the diameter of the processed drill hole can reach the expected diameter (the drill hole diameter that an operator expects to obtain before processing); thereby the utility model provides a drill bit 100 life for processing brittle-hard material is longer to drilling machining precision is higher.
Furthermore, the first blade 3 and the second blade 4 are symmetrical about the center line of the polycrystalline diamond tool bit 1, so that the polycrystalline diamond tool bit 1 can be stressed more uniformly in the process of extruding the brittle and hard material, and the service life is prolonged.
Further, the second end of the polycrystalline diamond cutter head 1 has a first cutter face 7, a second cutter face 8, a third cutter face 9 and a fourth cutter face 10; the first knife face 7 and the second knife face 8 are intersected to form the first knife edge 3, one end, far away from the first knife edge 3, of the first knife face 7 is used for extending towards the direction close to the knife body 2, and one end, far away from the first knife edge 3, of the second knife face 8 is used for extending towards the direction close to the knife body 2; the third knife face 9 intersects with fourth knife face 10 and forms second cutting edge 4, and the one end of keeping away from second cutting edge 4 on the third knife face 9 is used for extending to the direction that is close to cutter body 2, and the one end of keeping away from second cutting edge 4 on the fourth knife face 10 is used for extending to the direction that is close to cutter body 2, and simple structure, the preparation degree of difficulty is lower.
Further, the first blade 3 and the second blade 4 are located on the first plane, the included angle between the first blade 7 and the first plane is 20-60 degrees, the included angle between the second blade 8 and the first plane is 20-60 degrees, the included angle between the third blade 9 and the first plane is 20-60 degrees, and the included angle between the fourth blade 10 and the first plane is 20-60 degrees, so that the polycrystalline diamond cutter head 1 can be guaranteed to have sufficient sharpness, the polycrystalline diamond cutter head 1 can be guaranteed to have sufficient anti-collapse performance, and the polycrystalline diamond cutter head 1 is not prone to collapse during drilling.
Further, an included angle between the first tool face 7 and the first plane is 30 degrees, an included angle between the second tool face 8 and the first plane is 45 degrees, an included angle between the third tool face 9 and the first plane is 30 degrees, and an included angle between the fourth tool face 10 and the first plane is 45 degrees, so that the sharpness and the collapse resistance of the polycrystalline diamond tool bit 1 can reach an optimal balance state.
Further, the mounting groove has been seted up on the second end of cutter body 2, and polycrystalline diamond tool bit 1's first end is arranged in fixed the inlaying and locates the mounting groove, and wherein comparatively preferentially, adopt vacuum welding to realize fixed connection between polycrystalline diamond tool bit 1's first end and the mounting groove, can make to connect more firmly reliable.
Furthermore, the second end of the cutter body 2 is provided with a fifth cutter surface 11, a sixth cutter surface 12, a seventh cutter surface 13 and an eighth cutter surface 14, the fifth cutter surface 11 is coplanar with the first cutter surface 7, the sixth cutter surface 12 is coplanar with the second cutter surface 8, the seventh cutter surface 13 is coplanar with the third cutter surface 9, and the eighth cutter surface 14 is coplanar with the fourth cutter surface 10, so that force transmission between the cutter body 2 and the polycrystalline diamond cutter head 1 can be more stable, the interaction force between the cutter body 2 and the brittle and hard material can be effectively reduced, and the service life is prolonged.
Furthermore, a first chip guide groove 15 and a second chip guide groove 16 are formed in the second end of the cutter body 2, the first chip guide groove 15 is used for communicating the space above the first cutter face 7 in the drill hole with the outside, the second chip guide groove 16 is used for communicating the space above the third cutter face 9 in the drill hole with the outside, and the fragile material scraps scraped by the first cutter edge 3, the second cutter edge 4, the first peripheral edge 5 and the second peripheral edge 6 along with the rotation of the cutter body 2 can be discharged outside the drill hole through the first chip guide groove 15 and the second chip guide groove 16.
Further, the cutter body 2 is a hard alloy body, that is, the cutter body 2 is made of hard alloy, and compared with polycrystalline diamond, the hard alloy has lower material cost and is easier to process.
The principle and the implementation mode of the utility model are explained by applying a specific embodiment, and the explanation of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (9)
1. A drill bit for machining brittle-hard materials, characterized by: the polycrystalline diamond cutter comprises a polycrystalline diamond cutter head and a cutter body, wherein the first end of the cutter body is connected with a driving device and can be driven by the driving device to rotate, and the first end of the polycrystalline diamond cutter head is fixedly arranged on the second end of the cutter body; the second end of the polycrystalline diamond cutter head is used for protruding and fixing the second end of the cutter body and extending in the direction far away from the cutter body, the second end of the polycrystalline diamond cutter head is provided with a first cutting edge and a second cutting edge, the first cutting edge and the second cutting edge are both used for being in contact with a brittle and hard material and enabling the brittle and hard material to be extruded and crushed to form a drilled hole, the included angle between the first cutting edge and the second cutting edge is larger than 90 degrees, the first end of the first cutting edge is used for being connected with the first end of the second cutting edge, the second end of the first cutting edge is used for extending in the direction close to the cutter body, and the second end of the second cutting edge is used for extending in the direction close to the cutter body; the polycrystalline diamond tool bit is provided with a first peripheral edge and a second peripheral edge, the first peripheral edge and the second peripheral edge are used for being in contact with the side wall of the drill hole, the first peripheral edge and the second peripheral edge are on the same cylindrical surface, the diameter of the cylindrical surface is used for being equal to the expected diameter of the drill hole, and the center line of the cylindrical surface is collinear with the center line of the polycrystalline diamond tool bit.
2. The drill bit for machining brittle-hard material as claimed in claim 1, characterized in that: the first cutting edge and the second cutting edge are symmetrical about a center line of the polycrystalline diamond segment.
3. The drill bit for machining a brittle-hard material as claimed in claim 2, characterized in that: the second end of the polycrystalline diamond cutter head is provided with a first cutter face, a second cutter face, a third cutter face and a fourth cutter face; the first knife face and the second knife face are intersected to form the first knife edge, one end, far away from the first knife edge, of the first knife face is used for extending towards the direction close to the knife body, and one end, far away from the first knife edge, of the second knife face is used for extending towards the direction close to the knife body; the third knife face and the fourth knife face are intersected to form the second knife edge, one end, far away from the second knife edge, of the third knife face is used for extending towards the direction close to the knife body, and one end, far away from the second knife edge, of the fourth knife face is used for extending towards the direction close to the knife body.
4. A drill bit for machining brittle-hard material as claimed in claim 3, characterized in that: the first cutting edge with the second cutting edge is located the first plane jointly, first knife face with contained angle between the first plane is 20~60 degrees, the second knife face with contained angle between the first plane is 20~60 degrees, the third knife face with contained angle between the first plane is 20~60 degrees, the fourth knife face with contained angle between the first plane is 20~60 degrees.
5. The drill bit for machining brittle-hard material as claimed in claim 4, characterized in that: the first knife face with contained angle between the first plane is 30 degrees, the second knife face with contained angle between the first plane is 45 degrees, the third knife face with contained angle between the first plane is 30 degrees, the fourth knife face with contained angle between the first plane is 45 degrees.
6. The drill bit for machining brittle-hard material as claimed in claim 5, characterized in that: the second end of the cutter body is provided with an installation groove, and the first end of the polycrystalline diamond cutter head is fixedly embedded in the installation groove.
7. The drill bit for machining brittle-hard material as claimed in claim 6, characterized in that: the second end of the cutter body is provided with a fifth cutter face, a sixth cutter face, a seventh cutter face and an eighth cutter face, wherein the fifth cutter face is coplanar with the first cutter face, the sixth cutter face is coplanar with the second cutter face, the seventh cutter face is coplanar with the third cutter face, and the eighth cutter face is coplanar with the fourth cutter face.
8. The drill bit for machining brittle-hard material as claimed in claim 7, characterized in that: the second end of the cutter body is provided with a first chip guide groove and a second chip guide groove, the first chip guide groove is used for communicating the space above the first cutter face in the drill hole with the outside, and the second chip guide groove is used for communicating the space above the third cutter face in the drill hole with the outside.
9. The drill bit for machining brittle-hard material as claimed in claim 1, characterized in that: the cutter body is a hard alloy body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008429.8U CN217395349U (en) | 2022-08-02 | 2022-08-02 | Drill bit for processing brittle and hard materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008429.8U CN217395349U (en) | 2022-08-02 | 2022-08-02 | Drill bit for processing brittle and hard materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217395349U true CN217395349U (en) | 2022-09-09 |
Family
ID=83148087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222008429.8U Active CN217395349U (en) | 2022-08-02 | 2022-08-02 | Drill bit for processing brittle and hard materials |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217395349U (en) |
-
2022
- 2022-08-02 CN CN202222008429.8U patent/CN217395349U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8191656B2 (en) | Auto adaptable cutting structure | |
| JP3441819B2 (en) | Rock drill | |
| EP2118431B1 (en) | Rotary drag bit | |
| EP0391683A1 (en) | Drilling | |
| JPS59187989A (en) | Rotary type cutting member for hole drilling | |
| EP2533922A1 (en) | Superhard tool tip, method for making same and tool comprising same | |
| US11591858B2 (en) | Cutting elements with increased curvature cutting edges | |
| CN114929986A (en) | Cutting element with improved mechanical efficiency | |
| CN217395349U (en) | Drill bit for processing brittle and hard materials | |
| CN210755378U (en) | Novel diamond micro-drill bit | |
| JP5914446B2 (en) | Cutting tool and workpiece machining method using the same | |
| CN201102089Y (en) | Improved structure of miniature drill | |
| CN105863517A (en) | Composite sheet based on polycrystalline diamond and impregnated diamond | |
| CN115799094A (en) | Cleaver for microelectronic bonding and processing method thereof | |
| CN202219341U (en) | Drill bit with double symmetrical chip separating grooves for printed circuit boards | |
| CN214602099U (en) | A bore integrative cutter of ream for carbon fiber reinforced composite | |
| CN201586775U (en) | High efficiency cutting drill for aluminium base board | |
| JPS6125941Y2 (en) | ||
| CN205314922U (en) | Wing formula composite drill bit | |
| CN218253056U (en) | Drill bit capable of reducing resistance | |
| CN217551254U (en) | PCD drilling reamer | |
| CN212042817U (en) | Perforating drill bit with tool bit not prone to cracking | |
| CN221890942U (en) | Drill bit with chip groove | |
| CN209742797U (en) | Bidirectional cutting edge polycrystalline diamond compact for high-frequency rotary vibration rock crushing | |
| CN215150553U (en) | Cutter for processing SIC material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |