CN219170394U - Sleeve grinding drill bit - Google Patents
Sleeve grinding drill bit Download PDFInfo
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- CN219170394U CN219170394U CN202223444991.1U CN202223444991U CN219170394U CN 219170394 U CN219170394 U CN 219170394U CN 202223444991 U CN202223444991 U CN 202223444991U CN 219170394 U CN219170394 U CN 219170394U
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- drill bit
- chip removal
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- mill
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The utility model relates to a sleeved grinding drill bit, and belongs to the field of grinding processing. Comprising the following steps: the drill bit, the clamping pipe, the water through groove and the chamfer mill are of tubular structures, the water through groove is of a strip-shaped groove structure, the chamfer mill is arranged on the inner wall of the drill bit, the drill bit is coaxially connected with the clamping pipe, and the water through groove is arranged on the chamfer mill; the drill bit is characterized in that a drill bit base body is arranged on the drill bit, the drill bit base body is of a tubular structure, a plurality of chip removal holes are formed in the outer side wall of the drill bit base body, and the chip removal holes are through holes with installation positions corresponding to the installation positions of the chamfer mill. The utility model optimizes the cooling and chip removing modes, is favorable for further improving the rotating speed of the drill bit and improves the processing efficiency.
Description
Technical Field
The utility model relates to the field of grinding, in particular to a grinding bit.
Background
In the drilling machine machining process, irregular bars with different diameters are sleeved from one workpiece, so that a sleeved grinding drill bit is required to be used, water is continuously injected into the drill bit for cooling in the sleeved grinding drill bit machining process, and meanwhile, water flow is utilized to bring out ground and drilled workpiece powder scraps. The prior art sleeve grinding drill adopts an internal cooling mode, cold water cools chamfer surfaces through a plurality of water tanks or chip removal grooves from a middle hole to a chamfer grinding area, then reaches a drill drilling area through the inner wall of a matrix, at the moment, one part of water reaches the outer diameter of the drill through the drill water tank, the other part of water cools the drill surface through the end face of the drill, and the ground and drilled workpiece powder scraps are discharged through the outer diameter of the matrix. In the prior art, the dust of the chamfer mill is basically discharged along the same path with cooling water, and because the water flow channel formed by the inner diameter and the outer diameter of the drill bit and the workpiece is very narrow, excessive dust can inhibit water flow and even form a blocking phenomenon, and especially when the sleeve milling depth is large, the chip removal problem is the biggest factor limiting the processing efficiency and is not suitable for high-rotation-speed processing. When the rotating speed is high and the centrifugal force is increased, the discharge of dust is seriously affected, so that the work efficiency and the surface quality are both restricted.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: a drill bit is ground in a sleeved mode, and cooling and chip removal modes in the working process are optimized.
The technical scheme for solving the technical problems is as follows: a finish-ground drill bit, comprising: the drill bit, the clamping pipe, the water through groove and the chamfer mill are of tubular structures, the water through groove is of a strip-shaped groove structure, the chamfer mill is arranged on the inner wall of the drill bit, the drill bit is coaxially connected with the clamping pipe, and the water through groove is arranged on the chamfer mill; the drill bit is characterized in that a drill bit base body is arranged on the drill bit, the drill bit base body is of a tubular structure, a plurality of chip removal holes are formed in the outer side wall of the drill bit base body, and the chip removal holes are through holes with installation positions corresponding to the installation positions of the chamfer mill.
The beneficial effects of the utility model are as follows: the plurality of chip grooves are arranged on the drill bit, so that workpiece powder chips generated by grinding can be discharged to the outer diameter of the sleeve grinding drill from the chamfering area inside the sleeve grinding drill through the chip grooves in time under the action of centrifugal force in the process of grinding the workpiece in the chamfering area, and the workpiece powder chips are timely brought out by matching with cooling water injected from the water through grooves, so that the blocking phenomenon generated when all the powder chips are discharged to the outer diameter of the sleeve grinding drill from the end face of the drill bit is avoided, the rotating speed of the sleeve grinding drill is improved, and the machining efficiency is further improved.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the drill bit further comprises a drill bit working part, the drill bit working part is of a tubular structure, and the drill bit working part is sleeved on the drill bit base body and far away from the clamping pipe ends.
Further, a plurality of drill cooling chip removal inner grooves and a plurality of drill cooling chip removal outer grooves are arranged on the drill working part, the drill cooling chip removal inner grooves and the drill cooling chip removal outer grooves are bar-shaped groove-shaped structures, and the drill cooling chip removal inner grooves and the drill cooling chip removal outer grooves axially penetrate through the inner side wall and the outer side wall of the drill working part in a one-to-one correspondence mode.
The beneficial effects of adopting the further scheme are as follows: the drill bit cooling chip removing inner groove and the drill bit cooling chip removing outer groove are beneficial to cooling the inner side wall and the outer side wall of the drill bit working part on one hand and discharging workpiece powder scraps generated by the drill bit working part from the end face of the drill bit working part along cooling water on the other hand.
The chamfer mill comprises a plurality of toothed structures arranged around the inner wall of the drill bit matrix, and the chamfer mill is connected with the inner wall of the drill bit matrix.
The beneficial effects of adopting the further scheme are as follows: the chamfer mill is favorable for designing different chamfer angles according to different required chamfer area shapes and angles in the grinding process, so that a workpiece is ground into a preset shape, and the tooth-shaped structure is favorable for chip removal and cooling.
Further, the water channel comprises a plurality of chamfer mill cooling chip removal splitter boxes and a plurality of drill bit cooling chip removal splitter boxes, and the chamfer mill cooling chip removal splitter boxes and the drill bit cooling chip removal splitter boxes are of strip-shaped groove-shaped structures.
Further, a plurality of chamfer grinds cooling chip removal splitter boxes are in respectively set up on the multiple tooth form structure of chamfer mill, chamfer grinds cooling chip removal splitter boxes axial run through the tooth form structure inner wall of chamfer mill, chamfer grinds on each tooth form structure the degree of depth of chamfer grinds cooling chip removal splitter boxes radially increases gradually.
Further, the drill cooling chip removal splitter is disposed between two adjacent tooth structures of the chamfer mill.
The beneficial effects of adopting the further scheme are as follows: the chamfer mill cooling chip removal splitter box is beneficial to cooling the working face of the chamfer mill on one hand, avoiding damaging the chamfer mill due to overhigh temperature of the chamfer mill, on the other hand, being beneficial to discharging workpiece powder scraps generated by grinding the chamfer mill from the chip removal box along cooling water under the action of centrifugal force, reducing blocking phenomenon in the grinding process, and meanwhile, the different depths of the chamfer mill cooling chip removal splitter box are beneficial to sufficiently cooling the working face of the chamfer mill, so as to avoid influence on machining effect due to uneven cooling effect of radial all parts of the working face of the chamfer mill; the drill cooling chip removal splitter box is favorable for conveying cooling water to the drill working part and cooling the drill working part.
Further, the ratio of the projected areas of the chamfer mill cooling chip removal splitter groove and the end face of the drill cooling chip removal splitter groove in the axial direction is the same as the ratio of the projected areas of the chamfer mill and the grinding end face of the drill working part in the axial direction.
The beneficial effects of adopting the further scheme are as follows: the cooling device is beneficial to reasonably distributing waterways, fully cooling the working surfaces of the chamfer mill and the drill bit working part, and avoiding the processing quality problem and the efficiency problem caused by uneven cooling.
Drawings
FIG. 1 is a schematic view of the overall structure of a casing grinding drill according to an embodiment of the present utility model;
FIG. 2 is a front view of a drill set according to an embodiment of the present utility model;
FIG. 3 is a cross-sectional view of the structure of FIG. 2 taken along section line A-A;
FIG. 4 is a cross-sectional view of the structure of FIG. 2 taken along section line D-D;
FIG. 5 is a cross-sectional view of the structure of FIG. 2 taken along section line E-E;
FIG. 6 is a cross-sectional view of the structure of FIG. 2 taken along section line F-F;
FIG. 7 is a schematic diagram of a finish grinding drill according to an embodiment of the present utility model;
FIG. 8 is an enlarged view of a portion of the V region of the structure of FIG. 7;
fig. 9 is an enlarged view of a portion of the U region of the structure shown in fig. 7.
Wherein arrows in fig. 7 to 9 indicate the cooling water flow direction and trajectory.
In the drawings, the list of components represented by the various numbers is as follows:
1. a drill bit; 2. clamping the pipe; 3. a water passage groove; 4. chamfering and grinding; 11. a drill bit base; 13. a drill bit working member; 32. cooling and chip removing diversion grooves of chamfering mill; 33. the drill bit cools the chip removal splitter box; 111. chip removal holes; 131. cooling the chip removal inner groove by the drill bit; 132. the drill bit cools the chip removal external groove.
Detailed Description
The principles and features of the present utility model are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1 to 5, a finish grinding bit includes: the drilling machine comprises a drilling bit 1, a clamping pipe 2, a water through groove 3 and a chamfer mill 4, wherein the drilling bit 1 and the clamping pipe 2 are of tubular structures, the water through groove 3 is of a strip-shaped groove-shaped structure, the chamfer mill 4 is arranged on the inner wall of the drilling bit 1, the drilling bit 1 and the clamping pipe 2 are coaxially connected, and the water through groove 3 is arranged on the chamfer mill 4; the drill bit 1 is provided with a drill bit matrix 11, the drill bit matrix 11 is of a tubular structure, the outer side wall of the drill bit matrix 11 is provided with a plurality of chip removal holes 111, and the chip removal holes 111 are through holes with installation positions corresponding to the installation positions of the chamfer mill 4.
The beneficial effects of the utility model are as follows: the plurality of chip grooves are arranged on the drill bit, so that workpiece powder chips generated by grinding can be discharged to the outer diameter of the sleeve grinding drill from the chamfering area inside the sleeve grinding drill through the chip grooves in time under the action of centrifugal force in the process of grinding the workpiece in the chamfering area, and the workpiece powder chips are timely brought out by matching with cooling water injected from the water through grooves, so that the blocking phenomenon generated when all the powder chips are discharged to the outer diameter of the sleeve grinding drill from the end face of the drill bit is avoided, the rotating speed of the sleeve grinding drill is improved, and the machining efficiency is further improved.
Preferably, as shown in fig. 6, the drill bit 1 further includes a bit working member 13, where the bit working member 13 has a tubular structure, and the bit working member 13 is sleeved on the end of the bit base 11 away from the holding tube 2.
Preferably, as shown in fig. 6, the drill working member 13 is provided with a plurality of drill cooling chip removing inner grooves 131 and a plurality of drill cooling chip removing outer grooves 132, the drill cooling chip removing inner grooves 131 and the drill cooling chip removing outer grooves 132 are each in a bar-shaped groove structure, and the drill cooling chip removing inner grooves 131 and the drill cooling chip removing outer grooves 132 axially penetrate through the inner side wall and the outer side wall of the drill working member 13 in a one-to-one correspondence manner.
Among them, it is to be understood that: the drill cooling chip removing inner groove 131 and the drill cooling chip removing outer groove 132 may be spaced apart. Namely, the drill cooling chip removal outer groove 132 is arranged between the two drill cooling chip removal inner grooves 131, and the drill cooling chip removal inner groove 131 is arranged between the two drill cooling chip removal outer grooves 132.
The beneficial effects of adopting the preferable scheme are as follows: the drill bit cooling chip removing inner groove and the drill bit cooling chip removing outer groove are beneficial to cooling the inner side wall and the outer side wall of the drill bit working part on one hand and discharging workpiece powder scraps generated by the drill bit working part from the end face of the drill bit working part along cooling water on the other hand.
Preferably, as shown in fig. 3 to 5, the chamfer mill 4 includes a plurality of tooth-like structures disposed around the inner wall of the bit body 11, and the chamfer mill 4 is connected to the inner wall of the bit body 11.
The beneficial effects of adopting the preferable scheme are as follows: the chamfer mill is favorable for designing different chamfer angles according to the different shapes and angles of the chamfer areas required in the grinding process, so that a workpiece is ground into a preset shape, and the toothed structure is favorable for chip removal and cooling and improves the machining efficiency.
Preferably, as shown in fig. 3 to 5, the water passage groove 3 includes a plurality of chamfer mill cooling chip removal diversion grooves 32 and a plurality of drill cooling chip removal diversion grooves 33, and the chamfer mill cooling chip removal diversion grooves 32 and the drill cooling chip removal diversion grooves 33 are each in a bar-shaped groove-like structure.
Preferably, as shown in fig. 3 and 4, a plurality of the chamfer mill cooling chip removal diversion grooves 32 are respectively arranged on a plurality of tooth-shaped structures of the chamfer mill 4, the chamfer mill cooling chip removal diversion grooves 32 axially penetrate through the inner wall of the tooth-shaped structure of the chamfer mill 4, and the depth of the chamfer mill cooling chip removal diversion grooves 32 on each tooth-shaped structure of the chamfer mill 4 gradually increases along the radial direction.
Preferably, as shown in fig. 3 and 4, the drill cooling chip removal diverter channel 33 is disposed between two adjacent tooth structures of the chamfer mill 4.
Among them, it is to be understood that: the chamfer mill cooling chip removal splitter 32 and the drill cooling chip removal splitter 33 are both substantially evenly distributed on the sidewall of the chamfer mill 4, and the chamfer mill cooling chip removal splitter 32 and the drill cooling chip removal splitter 33 may be spaced apart.
The beneficial effects of adopting the preferable scheme are as follows: the chamfer mill cooling chip removal splitter box is beneficial to cooling the working face of the chamfer mill on one hand, damage to the chamfer mill or a workpiece due to overhigh temperature of the working face of the chamfer mill is avoided, on the other hand, workpiece powder scraps generated by grinding of the chamfer mill are discharged from the chip removal box along cooling water under the action of centrifugal force, the blocking phenomenon in the grinding process is reduced, and meanwhile, the depth of the chamfer mill cooling chip removal splitter box is beneficial to sufficiently cooling the working face of the chamfer mill, so that the influence on the machining effect caused by uneven cooling effect of each part in the radial direction of the chamfer mill is avoided; the drill cooling chip removal splitter box is favorable for conveying cooling water to the drill working part and cooling the drill working part.
Preferably, as shown in fig. 1 to 6, the ratio of the projected areas of the chamfer mill cooling chip removal splitter 32 and the drill cooling chip removal splitter 33 end faces in the axial direction is the same as the ratio of the projected areas of the chamfer mill 4 and the drill working member 13 grinding end faces in the axial direction.
The beneficial effects of adopting the preferable scheme are as follows: the cooling device is beneficial to reasonably distributing waterways, fully cooling the working surfaces of the chamfer mill and the drill bit working part, and avoiding the processing quality problem and the efficiency problem caused by uneven cooling.
The working of the utility model is illustrated by one example:
as shown in fig. 1 to 9, in the present embodiment, the holding pipe 2 is coaxially installed with a spindle of a machine tool, the spindle of the machine tool drives a casing grinding drill to rotate to grind a workpiece, and the spindle of the machine tool injects cooling water from the holding pipe 2 into the casing grinding drill by way of center water outlet, thereby realizing cooling and chip removal effects. When grinding a workpiece, the drill bit working member 13 grinds the workpiece from top to bottom, wherein a bar with a taper angle is required to be ground in the chamfer area. Therefore, in the grinding process, on one hand, under the centrifugal force generated by high-speed rotation of the sleeve grinding bit, the workpiece powder scraps ground by the chamfer grinding machine 4 are discharged to the outer side wall of the sleeve grinding bit from the plurality of chip discharging holes 111 on the bit body 11 along the cooling water brought by the water through groove 3; on the other hand, the workpiece dust ground by the bit working member 13 is discharged from the end face along the cooling water brought by the bit cooling chip removing inner groove 131 and the bit cooling chip removing outer groove 132. The workpiece powder scraps discharged in the two aspects are discharged from the middle of the side wall of the sleeve grinding drill and the inner wall ground by the workpiece from bottom to top through cooling water, so that the chip removal of the sleeve grinding drill is realized. At the same time, the water channel 3 is divided into two paths for cooling the sleeve grinding drill, namely, cooling water flows into the chamfer grinding cooling chip removal diversion channel 32 for cooling the working surface of the chamfer grinding; the cooling water flows into the drill cooling chip removal diversion groove 33, and then flows into the drill cooling chip removal inner groove 131 and the drill cooling chip removal outer groove 132, thereby cooling the drill working member 13.
According to the utility model, the cooling and chip removal are carried out in two ways, so that a cooling water cooling channel is smoother, high-efficiency cooling and rapid chip removal can be realized, and the processing efficiency is improved; meanwhile, as workpiece powder scraps of the chamfer grinding part do not pass through a drill bit working part any more, unnecessary grinding on the outer diameter of the drill bit is greatly reduced, the thickness reduction of the wall thickness of the drill bit is facilitated, the load reduction is facilitated, the edge burst phenomenon during grinding is reduced, the service life of the drill bit part is prolonged, and further high-speed machining is realized, wherein centrifugal force generated by high-speed rotation of the finish grinding drill is beneficial to cooling and chip removal, the grinding surface quality is improved, the machining efficiency is improved, and the production cost is reduced.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (8)
1. A drill bit for a grinding set, comprising: the drilling machine comprises a drilling bit (1), a clamping pipe (2), a water through groove (3) and a chamfer mill (4), wherein the drilling bit (1) and the clamping pipe (2) are of tubular structures, the water through groove (3) is of a strip-shaped groove-shaped structure, the chamfer mill (4) is arranged on the inner wall of the drilling bit (1), the drilling bit (1) and the clamping pipe (2) are coaxially connected, and the water through groove (3) is arranged on the chamfer mill (4);
the drill bit is characterized in that a drill bit base body (11) is arranged on the drill bit (1), the drill bit base body (11) is of a tubular structure, a plurality of chip removal holes (111) are formed in the outer side wall of the drill bit base body (11), and the chip removal holes (111) are through holes corresponding to the installation positions of the chamfer mill (4).
2. The grinding bit according to claim 1, wherein the bit (1) further comprises a bit working part (13), the bit working part (13) is of a tubular structure, and the bit working part (13) is sleeved at the end of the bit base body (11) far away from the clamping tube (2).
3. The milling drill bit according to claim 2, characterized in that a plurality of drill bit cooling chip removal inner grooves (131) and a plurality of drill bit cooling chip removal outer grooves (132) are arranged on the drill bit working part (13), the drill bit cooling chip removal inner grooves (131) and the drill bit cooling chip removal outer grooves (132) are of strip-shaped groove-shaped structures, and the drill bit cooling chip removal inner grooves (131) and the drill bit cooling chip removal outer grooves (132) axially penetrate through the inner side wall and the outer side wall of the drill bit working part (13) in a one-to-one correspondence mode.
4. A drill bit according to claim 2, characterized in that the chamfer mill (4) comprises a plurality of tooth-like structures arranged around the inner wall of the drill bit body (11), the chamfer mill (4) being connected to the inner wall of the drill bit body (11).
5. The set-ground drill bit according to claim 2, characterized in that the water channel (3) comprises a plurality of chamfer-mill cooling chip removal shunt grooves (32) and a plurality of drill bit cooling chip removal shunt grooves (33), and the chamfer-mill cooling chip removal shunt grooves (32) and the drill bit cooling chip removal shunt grooves (33) are of a strip-shaped groove-shaped structure.
6. The drill bit set forth in claim 5, wherein a plurality of said chamfer mill cooling chip removal splitter boxes (32) are provided on a plurality of tooth-like structures of said chamfer mill (4), respectively, said chamfer mill cooling chip removal splitter boxes (32) axially penetrate through inner walls of tooth-like structures of said chamfer mill (4), and depths of said chamfer mill cooling chip removal splitter boxes (32) on each tooth-like structure of said chamfer mill (4) are gradually increased in a radial direction.
7. A finish grinding bit according to claim 5, characterized in that the bit cooling chip-removing shunt grooves (33) are arranged between two adjacent tooth-like structures of the chamfer grinding (4).
8. The drill bit set forth in claim 5, characterized in that the ratio of the projected areas of the chamfer mill cooling chip removal splitter (32) and the drill bit cooling chip removal splitter (33) end faces in the axial direction is the same as the ratio of the projected areas of the chamfer mill (4) and the drill bit working member (13) grinding end faces in the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223444991.1U CN219170394U (en) | 2022-12-22 | 2022-12-22 | Sleeve grinding drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223444991.1U CN219170394U (en) | 2022-12-22 | 2022-12-22 | Sleeve grinding drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219170394U true CN219170394U (en) | 2023-06-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223444991.1U Active CN219170394U (en) | 2022-12-22 | 2022-12-22 | Sleeve grinding drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219170394U (en) |
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2022
- 2022-12-22 CN CN202223444991.1U patent/CN219170394U/en active Active
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