CN113751978A - Production process of antioxidant alloy drill bit - Google Patents
Production process of antioxidant alloy drill bit Download PDFInfo
- Publication number
- CN113751978A CN113751978A CN202111008904.5A CN202111008904A CN113751978A CN 113751978 A CN113751978 A CN 113751978A CN 202111008904 A CN202111008904 A CN 202111008904A CN 113751978 A CN113751978 A CN 113751978A
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- drill bit
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- raw material
- coating
- polishing
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- 239000000956 alloy Substances 0.000 title claims abstract description 66
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 239000003963 antioxidant agent Substances 0.000 title claims abstract description 10
- 230000003078 antioxidant effect Effects 0.000 title claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 60
- 239000011248 coating agent Substances 0.000 claims abstract description 54
- 239000002994 raw material Substances 0.000 claims abstract description 42
- 238000005520 cutting process Methods 0.000 claims abstract description 35
- 238000005498 polishing Methods 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 238000004806 packaging method and process Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims description 57
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 230000003647 oxidation Effects 0.000 claims description 14
- 238000007254 oxidation reaction Methods 0.000 claims description 14
- 238000007740 vapor deposition Methods 0.000 claims description 14
- 239000011261 inert gas Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 claims description 10
- 238000007709 nanocrystallization Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000002086 nanomaterial Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000003064 anti-oxidating effect Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims 2
- 238000007605 air drying Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 abstract description 3
- 239000002356 single layer Substances 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 8
- 235000006708 antioxidants Nutrition 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 241001391944 Commicarpus scandens Species 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention belongs to the technical field of production processes, in particular to an antioxidant alloy drill bit production process, which aims at the problem that a single-layer coating film is easy to fall off, and provides the following scheme, wherein the production process comprises a production step; raw material pretreatment, namely performing prenatal treatment on the hard alloy serving as the raw material; step two; polishing the raw materials, namely polishing the hard alloy to facilitate later cutting; step three; shaping, polishing and cutting, namely cutting and polishing the processed hard alloy to reach the ideal specification of the drill bit; step four; coating covering treatment, namely covering the surface of the polished and shaped drill bit with a plurality of layers of coatings; step five; inspecting and packaging the product, inspecting the appearance, specification and the like of the drill bit of the finished product, and packaging and storing qualified products; the raw material pretreatment comprises raw material heat treatment and raw material cutting. The drill bit coating is not easy to fall off, the heat insulation performance and the wear resistance are greatly enhanced, and the service life of the drill bit is ensured.
Description
Technical Field
The invention relates to the technical field of production processes, in particular to a production process of an antioxidant alloy drill bit.
Background
The drill bit is a cutting tool used by a typical drill or drilling machine to drill through or blind holes in solid materials. The basic principle of the drill bit is to rotate the edge cutting of the drill bit, cut a workpiece and remove drill cuttings through a drill slot. Commonly used drill bits mainly include twist drills, flat drills, center drills, deep hole drills, and trepanning drills. Reamers and reamers are not capable of drilling solid materials, but they are also traditionally classified as drills.
In the prior art, in order to ensure the applicability of the drill bit, structures such as steel or hard alloy are generally used for processing to ensure the hardness of the drill bit, and meanwhile, a coating film is used for the auxiliary purpose to ensure the heat insulation performance and the wear resistance of the drill bit.
Disclosure of Invention
Based on the technical problem that a single-layer coating film is easy to fall off in the background technology, the invention provides a production process of an antioxidant alloy drill bit.
The invention provides a production process of an antioxidant alloy drill bit, which comprises the following production steps of; raw material pretreatment, namely performing prenatal treatment on the hard alloy serving as the raw material;
step two; polishing the raw materials, namely polishing the hard alloy to facilitate later cutting;
step three; shaping, polishing and cutting, namely cutting and polishing the processed hard alloy to reach the ideal specification of the drill bit;
step four; coating covering treatment, namely covering the surface of the polished and shaped drill bit with a plurality of layers of coatings;
step five; inspecting and packaging the product, inspecting the appearance, specification and the like of the drill bit of the finished product, and packaging and storing qualified products;
the raw material pretreatment comprises raw material heat treatment and raw material cutting;
the raw material polishing treatment comprises coarse grinding of an outer circle, fine grinding of the outer circle, grinding of a flat tip and primary ultrasonic cleaning;
the shaping, polishing and cutting comprises water injection groove polishing, grooving and shoveling, drill point grinding, product marking and secondary ultrasonic cleaning;
the coating covering treatment comprises coating nanocrystallization, inert gas injection, vapor deposition coating and standing.
Preferably, the raw material heat treatment is to perform a heat treatment process on the hard alloy so as to enhance the hardness and toughness of the hard alloy, the raw material cutting is to cut the whole hard alloy into a length suitable for processing, the hard alloy serving as the raw material has excellent hardness performance but insufficient toughness, and a drill bit directly produced without treatment is applicable in strength but easy to break.
Preferably, the rough grinding outer circle grinds the cut hard alloy periphery to within a specified tolerance by using a thick grinding wheel so as to save production time, the fine grinding outer circle grinds the rough ground hard alloy by using a thin grinding wheel so as to reduce the surface roughness of the rough ground hard alloy, the grinding tip grinds the tip part partially so as to ensure the coaxiality of materials and facilitate the accurate degree of a later grinding drill tip, and the first ultrasonic cleaning is ultrasonic cleaning of the ground hard alloy so as to prevent powder and the like from influencing subsequent production.
Preferably, the water injection groove polishing is to polish a plurality of water injection grooves on the hard alloy, the slotting shovel back is to process the hard alloy by adopting a large core diameter specification, a double-edged belt and a 35-degree rotation angle design by using a five-axis grinding machine, the design of a high-precision spiral groove enables drilling and chip removal to be smoother, the rigidity of the drill bit is enhanced by the large core diameter specification, the grinding drill point is processed by a five-axis grinding machine by adopting a design scheme of 140-degree apex angle, the apex angle is 140 degrees, the sharpness of the drill bit is ensured, the drilling efficiency is accelerated, under the mutual cooperation, the drill bit is more applicable, the cutting rate is improved by 3 to 5 times compared with the common drill bit, the marking of the product is to carve company names or marks at corresponding positions of the product, the burr grinding is to grind burrs generated on a drill bit in the grinding and cutting processes to smooth the surface of the drill bit, the secondary ultrasonic cleaning is to carry out secondary cleaning on the drill bit after production so as to ensure the surface smoothness before coating coverage.
Preferably, the coating nanocrystallization is to add the titanium aluminum nitride coating into the nano material to carry out nanocrystallization so as to enhance the performance of the coating, the inert gas injection is to inject the inert gas in the plating process to prevent the drill bit from being oxidized, the vapor deposition coating is to uniformly attach the nano aluminum titanium nitride coating on the drill bit in a vapor deposition mode, the standing is to air-dry and tightly attach the nano titanium aluminum nitride coating on the drill bit in a standing way, the vapor deposition coating and the standing form a circulating ring to enable the drill bit to be coated for many times, compared with the single-layer coating of the existing drill bit, the coating of the drill bit is not easy to fall off, the heat insulation performance and the wear resistance are greatly enhanced, and the oxidation resistance of the drill bit is enhanced by coating after the inert gas is injected, so that the service life of the drill bit is greatly prolonged and the formation of accumulated chips is effectively prevented.
The beneficial effects of the invention are as follows:
1. according to the production process of the oxidation-resistant alloy drill bit, the vapor deposition coating and the standing are arranged, and the vapor deposition coating and the standing form the circulating ring, so that the drill bit is coated with multiple layers of films.
2. This anti-oxidant alloy drill bit production technology, through being provided with fluting back of the shovel and grinding drill point, the fluting back of the shovel uses five-axis grinder to adopt big core footpath specification, twolip tape and 35 rotation angle designs and processes the carbide, the design of high accuracy helicla flute makes the drilling chip removal more smooth and easy, big core footpath specification has strengthened the rigidity of drill bit, the grinding drill point is processed the drill point with five-axis grinder adoption 140 apex angle design schemes, be 140 apex angles, the sharpness of drill bit has been ensured, drilling efficiency has been accelerated, under mutually supporting, make the drill bit more suitable, compare ordinary drill bit and improve the cutting rate 3-5 times.
3. According to the production process of the oxidation-resistant alloy drill bit, the raw material heat treatment is arranged, the hard alloy serving as the raw material has excellent hardness and insufficient toughness, the drill bit directly produced without treatment is applicable in strength but easy to break, the toughness of the hard alloy is enhanced by heat treatment of the hard alloy, the strength of the drill bit is ensured, the drill bit is greatly prevented from being broken in use, and the service life and the safety performance are enhanced.
The parts of the device not involved are the same as or can be implemented using prior art.
Drawings
FIG. 1 is a schematic structural diagram of the production steps of the production process of an oxidation-resistant alloy drill bit according to the present invention;
FIG. 2 is a schematic view of a raw material pretreatment structure of the production process of an oxidation-resistant alloy drill bit according to the present invention;
FIG. 3 is a schematic view of a raw material polishing structure of the production process of an oxidation-resistant alloy drill bit according to the present invention;
FIG. 4 is a schematic diagram of a shaping, polishing and cutting structure of the production process of an antioxidant alloy drill bit according to the present invention;
FIG. 5 is a schematic view of a coating covering structure of the anti-oxidation alloy drill bit production process according to the present invention.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-5, a process for producing an oxidation resistant alloy drill bit includes a production step including a first step; raw material pretreatment, namely performing prenatal treatment on the hard alloy serving as the raw material;
step two; polishing the raw materials, namely polishing the hard alloy to facilitate later cutting;
step three; shaping, polishing and cutting, namely cutting and polishing the processed hard alloy to reach the ideal specification of the drill bit;
step four; coating covering treatment, namely covering the surface of the polished and shaped drill bit with a plurality of layers of coatings;
step five; inspecting and packaging the product, inspecting the appearance, specification and the like of the drill bit of the finished product, and packaging and storing qualified products;
the raw material pretreatment comprises raw material heat treatment and raw material cutting;
the raw material polishing treatment comprises coarse grinding of an outer circle, fine grinding of the outer circle, grinding of a flat tip and primary ultrasonic cleaning;
the shaping, polishing and cutting comprises water injection groove polishing, grooving and shoveling, drill point grinding, product marking and secondary ultrasonic cleaning;
the coating covering treatment comprises coating nanocrystallization, inert gas injection, vapor deposition coating and standing.
Referring to fig. 2, in the present invention, the raw material heat treatment is to perform a heat treatment process on the cemented carbide to enhance the hardness and toughness of the cemented carbide, the raw material cutting is to cut a whole piece of cemented carbide into a length suitable for processing, the hardness of the hard alloy as the raw material is excellent, but the toughness is insufficient, and the drill directly produced without treatment is easy to break although the strength is suitable, and the toughness is enhanced by performing the heat treatment on the hard alloy, so that the strength is ensured, the drill is greatly prevented from breaking in use, and the service life and the safety performance are enhanced.
Referring to fig. 3, in the present invention, the rough grinding outer circle grinds the cut cemented carbide to within a predetermined tolerance with a coarser grinding wheel to save production time, and the finish grinding outer circle grinds the rough ground cemented carbide with a finer grinding wheel to reduce the surface roughness thereof.
Referring to fig. 3, in the invention, the tip part of the grinding tip is ground to be flat so as to ensure the coaxiality of materials and facilitate the accurate degree of the drill tip grinding in the later period, and the first ultrasonic cleaning is to perform ultrasonic cleaning on the grinded hard alloy so as to prevent powder and the like from influencing the subsequent production.
Referring to fig. 4, in the invention, the water injection groove polishing is to polish a plurality of water injection grooves on the hard alloy, the slotting shovel back is to process the hard alloy by adopting a large core diameter specification, a double-edged belt and a 35-degree rotation angle design by using a five-axis grinding machine, and the high-precision spiral groove design enables drilling and chip removal to be smoother, and the large core diameter specification enhances the rigidity of the drill bit.
Referring to fig. 4, in the invention, the grinding drill point is processed by a five-axis grinding machine by adopting a design scheme of 140-degree vertex angle, and the product marking is to carve company names or marks at corresponding positions of the product, so that the 140-degree vertex angle is formed, the sharpness of the drill bit is ensured, the drilling efficiency is accelerated, and the drill bit is more suitable under the mutual cooperation, and the cutting rate is improved by 3-5 times compared with a common drill bit.
Referring to fig. 4, in the present invention, the burr grinding is to grind burrs generated on the drill during grinding and cutting to make the surface smooth, and the secondary ultrasonic cleaning is to perform secondary cleaning on the produced drill to ensure the surface smoothness before coating covering.
Referring to fig. 5, in the invention, the coating nanocrystallization is to add a titanium aluminum nitride coating into a nanomaterial to perform nanocrystallization so as to enhance the coating performance, and the inert gas injection is to inject an inert gas in the coating process so as to prevent the drill bit from being oxidized.
Referring to fig. 5, in the vapor deposition coating, the nano aluminum titanium nitride coating is uniformly attached to the drill bit in a vapor deposition mode, the standing is realized in a way that the nano aluminum titanium nitride coating is air-dried and tightly attached to the drill bit, and the vapor deposition coating and the standing form a circulating ring to enable the drill bit to be coated for many times.
The working principle is as follows: firstly, enhancing the hardness and toughness of the hard alloy through a heat treatment process by raw material heat treatment, then cutting the heat-treated hard alloy into a length suitable for production through the raw material, calculating a final diameter according to a final requirement, then polishing the cut hard alloy through the raw material polishing treatment by the sequence of rough grinding, fine grinding and flat grinding of the top to make the hard alloy more suitable for later production, then cleaning off scraps on the surface of the hard alloy through first ultrasonic cleaning, then reprocessing the hard alloy through the shaping polishing cutting to make the hard alloy shaped, firstly polishing the water injection grooves, polishing a plurality of water injection grooves, then grooving and backing, processing the hard alloy by using a five-axis grinding machine with a large core diameter specification, a double-edged belt and a 35-degree rotation angle design, and enhancing the performance of a drill bit through a high-precision spiral groove design, grinding the drill point, processing the drill point by a five-axis grinding machine by adopting a design scheme of 140-degree vertex angle, enabling the drill bit to be more suitable, then processing the drill point according to the sequence of product marking, burr polishing and secondary ultrasonic cleaning, and finally, coating the drill bit by coating covering treatment, wherein the coating is firstly nanocrystallized to enhance the performance of the coating, then inert gas is injected to enhance the oxidation resistance of the drill bit, and finally, the drill bit is enabled to uniformly attach the nano aluminum titanium nitride coating to the drill bit in a multi-layer mode in a gas-phase deposition coating and standing mode through cyclic production of gas-phase deposition coating and standing so as to enhance the performance of the drill bit.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The production process of the oxidation-resistant alloy drill bit comprises the production steps, and is characterized in that the production steps comprise a first step; raw material pretreatment, namely performing prenatal treatment on the hard alloy serving as the raw material;
step two; polishing the raw materials, namely polishing the hard alloy to facilitate later cutting;
step three; shaping, polishing and cutting, namely cutting and polishing the processed hard alloy to reach the ideal specification of the drill bit;
step four; coating covering treatment, namely covering the surface of the polished and shaped drill bit with a plurality of layers of coatings;
step five; inspecting and packaging the product, inspecting the appearance, specification and the like of the drill bit of the finished product, and packaging and storing qualified products;
the raw material pretreatment comprises raw material heat treatment and raw material cutting;
the raw material polishing treatment comprises coarse grinding of an outer circle, fine grinding of the outer circle, grinding of a flat tip and primary ultrasonic cleaning;
the shaping, polishing and cutting comprises water injection groove polishing, grooving and shoveling, drill point grinding, product marking and secondary ultrasonic cleaning;
the coating covering treatment comprises coating nanocrystallization, inert gas injection, vapor deposition coating and standing.
2. The process for producing an oxidation resistant alloy drill bit as set forth in claim 1, wherein the raw material heat treatment is a heat treatment process of the cemented carbide to enhance hardness and toughness of the cemented carbide, and the raw material cutting is a cutting of the whole cemented carbide into a length suitable for machining.
3. The process for producing the antioxidant alloy drill bit as claimed in claim 1, wherein the rough grinding outer circle is formed by grinding the cut cemented carbide outer periphery to within a specified tolerance with a coarser grinding wheel to save production time, and the fine grinding outer circle is formed by finely grinding the rough ground cemented carbide with a finer grinding wheel to reduce the roughness of the surface.
4. The process for producing the anti-oxidation alloy drill bit according to claim 1, wherein the grinding tip is used for grinding the tip part to ensure the coaxiality of materials and facilitate accurate degree of later-stage grinding of the drill tip, and the first ultrasonic cleaning is used for carrying out ultrasonic cleaning on the grinded hard alloy to prevent powder and the like from affecting subsequent production.
5. The production process of the oxidation resistant alloy drill bit according to claim 1, wherein the water injection groove grinding is to grind a plurality of water injection grooves on the hard alloy, and the slotting shovel back is to machine the hard alloy by a five-axis grinding machine according to a large core diameter specification, a double-edged belt and a 35-degree rotation angle design.
6. The process for producing the antioxidant alloy drill bit as claimed in claim 1, wherein the grinding of the drill tip is carried out by machining the drill tip with a five-axis grinding machine by adopting a 140-degree vertex angle design scheme, and the marking of the product is carried out by carving a company name or a logo on a corresponding position of the product.
7. The process for producing an oxidation-resistant alloy drill bit as claimed in claim 1, wherein the burr grinding is to grind burrs generated on the drill bit during grinding and cutting to make the surface smooth, and the secondary ultrasonic cleaning is to perform secondary cleaning on the drill bit after production to ensure the surface smoothness before coating.
8. The process for producing an oxidation resistant alloy drill bit as claimed in claim 1, wherein the coating nanocrystallization is carried out by adding a titanium aluminum nitride coating to a nanomaterial to be nanocrystallized so as to enhance the coating performance, and the inert gas injection is carried out by injecting an inert gas during the coating process so as to prevent the drill bit from being oxidized.
9. The process for producing an oxidation-resistant alloy drill bit according to claim 1, wherein the vapor deposition coating is formed by uniformly attaching the nano aluminum titanium nitride coating to the drill bit through vapor deposition, the standing is formed by air-drying and tightly attaching the nano aluminum titanium nitride coating to the drill bit through standing, and the vapor deposition coating and the standing form a circulation loop so as to coat the drill bit for multiple times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111008904.5A CN113751978A (en) | 2021-08-31 | 2021-08-31 | Production process of antioxidant alloy drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111008904.5A CN113751978A (en) | 2021-08-31 | 2021-08-31 | Production process of antioxidant alloy drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113751978A true CN113751978A (en) | 2021-12-07 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111008904.5A Pending CN113751978A (en) | 2021-08-31 | 2021-08-31 | Production process of antioxidant alloy drill bit |
Country Status (1)
| Country | Link |
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| CN (1) | CN113751978A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114473647A (en) * | 2022-03-04 | 2022-05-13 | 湖南高河硬质合金有限公司 | Hard alloy surface treatment process |
| CN114888688A (en) * | 2022-05-06 | 2022-08-12 | 东莞市梵宇自动化科技有限公司 | Multi-station drill bit machining center |
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| CN112643414A (en) * | 2020-12-09 | 2021-04-13 | 航天科工哈尔滨风华有限公司 | Method for processing and manufacturing hard alloy drill bit |
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2021
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| CN1104263A (en) * | 1992-11-21 | 1995-06-28 | 克鲁伯·韦狄亚有限公司 | Tool and method for forming coated layer of body of same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114473647A (en) * | 2022-03-04 | 2022-05-13 | 湖南高河硬质合金有限公司 | Hard alloy surface treatment process |
| CN114888688A (en) * | 2022-05-06 | 2022-08-12 | 东莞市梵宇自动化科技有限公司 | Multi-station drill bit machining center |
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Application publication date: 20211207 |