CN114888245A - Full-automatic casting method for cylinder body - Google Patents
Full-automatic casting method for cylinder body Download PDFInfo
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- CN114888245A CN114888245A CN202210426133.XA CN202210426133A CN114888245A CN 114888245 A CN114888245 A CN 114888245A CN 202210426133 A CN202210426133 A CN 202210426133A CN 114888245 A CN114888245 A CN 114888245A
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- 238000005266 casting Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003973 paint Substances 0.000 claims abstract description 43
- 238000005507 spraying Methods 0.000 claims abstract description 33
- 238000004140 cleaning Methods 0.000 claims abstract description 21
- 238000003723 Smelting Methods 0.000 claims description 34
- 238000011179 visual inspection Methods 0.000 claims description 32
- 238000007689 inspection Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 20
- 239000012535 impurity Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 238000012423 maintenance Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000003963 antioxidant agent Substances 0.000 claims description 9
- 230000003078 antioxidant effect Effects 0.000 claims description 9
- 239000003921 oil Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 238000010422 painting Methods 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004040 coloring Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000005538 encapsulation Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005491 wire drawing Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000002372 labelling Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention provides a full-automatic casting method of a cylinder body, belonging to the field of cylinder body casting. The invention has mature process, simple operation, easy control, automatic forming and convenient subsequent processing and use, can ensure the service life of the cylinder body by the addition of the paint spraying process, can ensure the surface smoothness of the cylinder body by cleaning the inside of the mould, reduces the generation of burrs and wiredrawing, improves the use effect of the cylinder body, and ensures the surface stability of the cylinder body.
Description
Technical Field
The invention belongs to the technical field of cylinder body casting, and particularly relates to a full-automatic casting method for a cylinder body.
Background
The technological design of the cylinder body is the whole process of designing technological equipment according to the casting requirement, production batch and production conditions, and the analysis of casting structure, determining technological scheme, technological parameters and technological procedures.
The casting manufacturability of the part structure is analyzed, the structural characteristics of the part are determined, and improvement measures or defect prevention measures are provided.
The cylinder body casting method in the prior art is widely applied.
However, the existing cylinder body casting method has the problems that visual inspection, cleaning and maintenance cannot be carried out after casting, the subsequent deep processing procedures are influenced, and the existing cylinder body casting method does not have the functions of spraying paint and preventing rust and mixing labeling and storing.
Therefore, it is necessary to develop a method for casting a fully automatic cylinder block.
Disclosure of Invention
In order to solve the technical problems, the invention provides a full-automatic cylinder casting method, which aims to solve the problems that the subsequent deep processing procedure is influenced due to the fact that visual inspection, cleaning and maintenance cannot be carried out after casting, the full-automatic cylinder casting method does not have a paint spraying and rust preventing treatment function after casting and does not have an anti-confusion labeling inventory function, and the full-automatic cylinder casting method specifically comprises the following steps:
the method comprises the following steps: preparing a casting solution, namely putting raw materials into a smelting furnace for smelting, controlling the smelting time, smelting the raw materials to form a solution, wherein a zinc material and an antioxidant material are continuously added in the smelting, after mixed smelting, sampling and extracting for inspection, the main inspection is carried out, the flowing condition of the smelting solution and the impurity-containing condition in the smelting solution are carried out, and after inspection, an upper metal liquid layer is rinsed for later use;
step two: the casting operation specifically comprises the following steps:
the first step is as follows: cleaning and maintaining the interior of the casting mold, namely firstly cleaning the interior of the casting mold, separating an upper mold and a lower mold of the casting mold, respectively cleaning the interior of the upper mold and the lower mold, removing impurities and dust, cleaning a flow guide hole of the upper mold, taking out scraps and impurities, then closing the two molds and preparing for casting operation;
the second step is that: cooling and molding the casting, namely introducing a solution into the diversion hole to enable the solution to be filled in the die until the solution is flush with the upper part of the diversion hole, stopping filling the solution, standing, controlling the cooling temperature, opening the die after molding, separating the upper die from the lower die, taking out a cylinder blank, and preparing for subsequent processing operation;
step three: the painting operation of visual maintenance after casting specifically comprises the following steps:
the first step is as follows: visual inspection operation, namely placing the cast cylinder body blank on an inspection table, observing in a visual inspection mode, mainly inspecting whether the outer surface of the cylinder body blank has cracks or depressions, repairing if the cracks or the depressions exist, re-melting and remanufacturing if the cracks or the depressions cannot be repaired, performing deep processing through a lathe after the visual inspection, reaming and surface deburring operation, drilling the blocked mounting hole, removing the allowance, performing secondary visual inspection after the deep processing, and preparing subsequent processing operation after the visual inspection is qualified;
the second step is that: performing paint spraying operation, namely performing surface paint spraying operation on the cylinder body blank qualified by visual inspection, performing paint spraying operation on the surface of the cylinder body blank through a paint spraying gun, performing antioxidant paint spraying operation firstly, performing coloring paint spraying operation, performing spraying for 2-3 times in total, and performing final assembly operation after standing and airing after the paint is fully attached;
the third step: overall inspection and maintenance operation, wherein the cylinder body blank is generally inspected to check whether paint leakage exists or not and the condition of hole closing is detected, and after the cylinder body blank is checked to be correct, subsequent processing operation is prepared;
step four: marking and inventory operation of cylinder body blanks specifically comprises the following steps:
the first step is as follows: marking operation is beaten to the cylinder body blank, beats mark with the suitable position of cylinder body blank and handles, and main parameter contains: the model of the cylinder body, the production date, the batch number of the cylinder body and the using environment condition of the cylinder body are subjected to final marking treatment to manufacture the cylinder body;
the second step is that: the cylinder body inventory protection operation is carried out, when the cylinder body is in inventory, the cylinder body is prevented from being wet and violent impact, and the cylinder body is packaged and stored or transported through the foam box;
step five: the cylinder body installation is used, and the inside self of cylinder body is clean state, when installing or assembling again, need to pour into lubricating oil into to inside to paint sealed glue to the junction border of cylinder body, install the oil extraction bolt in the oil drain hole bottom the cylinder body simultaneously.
Preferably, in the step one, the smelting time is set to 100-.
Preferably, in the second step, the casting mold in the first step is internally cleaned, and the internal cleaning operation is mainly carried out through a nylon electric brush to remove dust and debris impurities.
Preferably, in the second step, the cooling in the second step is performed by air cooling or water cooling, the standing time is set to be 50-60 minutes, and the cooling temperature is set to be 10-20 ℃.
Preferably, in step three, the visual inspection in the first step adopts a mode of probing with an LED lamp and a magnifying glass in cooperation with the visual inspection.
Compared with the prior art, the invention has the following beneficial effects: the full-automatic casting method for the cylinder block is widely applied to the technical field of cylinder block casting. The invention has mature process, simple operation, easy control, automatic forming and convenient subsequent processing and use, can ensure the service life of the cylinder body by the addition of the paint spraying process, can ensure the surface smoothness of the cylinder body by cleaning the inside of the mould, reduces the generation of burrs and wiredrawing, improves the use effect of the cylinder body, and ensures the surface stability of the cylinder body.
Drawings
FIG. 1 is a flow chart of a method for casting a fully automatic cylinder block.
Fig. 2 is a flow chart of a casting operation.
FIG. 3 is a flow chart of a post-casting inspection maintenance painting operation.
FIG. 4 is a flow chart of a cylinder blank marking inventory operation.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
in the figure:
as shown in figure 1
The casting method of the full-automatic cylinder body specifically comprises the following steps:
s101: preparing a casting solution, namely putting raw materials into a smelting furnace for smelting, controlling the smelting time, smelting the raw materials to form a solution, wherein a zinc material and an antioxidant material are continuously added in the smelting, after mixed smelting, sampling and extracting for inspection, the main inspection is carried out, the flowing condition of the smelting solution and the impurity-containing condition in the smelting solution are carried out, and after inspection, an upper metal liquid layer is rinsed for later use;
s102: the casting operation, as shown in fig. 2, specifically includes the following steps:
s201: cleaning and maintaining the interior of the casting mold, namely firstly cleaning the interior of the casting mold, separating an upper mold and a lower mold of the casting mold, respectively cleaning the interior of the upper mold and the lower mold, removing impurities and dust, cleaning a flow guide hole of the upper mold, taking out scraps and impurities, then closing the two molds, and preparing for casting operation;
s202: cooling and molding the casting, namely introducing a solution into the diversion hole to enable the solution to be filled in the die until the solution is flush with the upper part of the diversion hole, stopping filling the solution, standing, controlling the cooling temperature, opening the die after molding, separating the upper die from the lower die, taking out a cylinder blank, and preparing for subsequent processing operation;
s103: the operation of painting for inspection and maintenance after casting, which is shown in the attached figure 3, specifically comprises the following steps:
s301: visual inspection operation, namely placing the cast cylinder body blank on an inspection table, observing in a visual inspection mode, mainly inspecting whether the outer surface of the cylinder body blank has cracks or depressions, repairing if the cracks or the depressions exist, re-melting and remanufacturing if the cracks or the depressions cannot be repaired, performing deep processing through a lathe after the visual inspection, reaming and surface deburring operation, drilling the blocked mounting hole, removing the allowance, performing secondary visual inspection after the deep processing, and preparing subsequent processing operation after the visual inspection is qualified;
s302: performing paint spraying operation, namely performing surface paint spraying operation on the cylinder body blank qualified by visual inspection, performing paint spraying operation on the surface of the cylinder body blank through a paint spraying gun, performing antioxidant paint spraying operation firstly, performing coloring paint spraying operation, performing spraying for 2-3 times in total, and performing final assembly operation after standing and airing after the paint is fully attached;
s303: overall inspection and maintenance operation, wherein the cylinder body blank is generally inspected to check whether paint leakage exists or not and the condition of hole closing is detected, and after the cylinder body blank is checked to be correct, subsequent processing operation is prepared;
s104: the marking and inventory operation of the cylinder blank is shown in the attached figure 4 and specifically comprises the following steps:
s401: marking operation is beaten to the cylinder body blank, beats mark with the suitable position of cylinder body blank and handles, and main parameter contains: the model of the cylinder body, the production date, the batch number of the cylinder body and the using environment condition of the cylinder body are subjected to final marking treatment to manufacture the cylinder body;
s402: the cylinder body inventory protection operation is carried out, when the cylinder body is in inventory, the cylinder body is prevented from being wet and violent impact, and the cylinder body is packaged and stored or transported through the foam box;
s105: the cylinder body installation is used, and the inside self of cylinder body is clean state, when installing or assembling again, need to pour into lubricating oil into to inside to paint sealed glue to the junction border of cylinder body, install the oil extraction bolt in the oil drain hole bottom the cylinder body simultaneously.
Preferably, in S101, the smelting time is set to 100-120 minutes, and the oxidation-resistant material is 0cr25ni20 stainless steel material.
Preferably, in S102, the casting mold in S201 is internally cleaned, mainly by a nylon electric brush, to remove dust and debris impurities.
Preferably, in S102, the cooling in S202 is performed by air cooling or water cooling, the standing time is set to 50-60 minutes, and the cooling temperature is set to 10-20 ℃.
Preferably, in S103, the visual inspection in S301 adopts a LED lamp searchlighting and magnifying glass cooperating with the visual inspection.
Preferably, in S103, the antioxidant paint in S302 is epoxy resin paint.
Preferably, in S103, the standing time in S302 is set to 24-36 hours, and the airing temperature is not more than 80 ℃.
Detailed description of the preferred embodiment
1. Preparing a casting solution, namely putting raw materials into a smelting furnace for smelting, controlling the smelting time, smelting the raw materials to form a solution, wherein a zinc material and an antioxidant material are continuously added in the smelting, after mixed smelting, sampling and extracting for inspection, the main inspection is carried out, the flowing condition of the smelting solution and the impurity-containing condition in the smelting solution are carried out, and after inspection, an upper metal liquid layer is rinsed for later use;
2. the casting operation specifically comprises the following steps:
the first step is as follows: cleaning and maintaining the interior of the casting mold, namely firstly cleaning the interior of the casting mold, separating an upper mold and a lower mold of the casting mold, respectively cleaning the interior of the upper mold and the lower mold, removing impurities and dust, cleaning a flow guide hole of the upper mold, taking out scraps and impurities, then closing the two molds, and preparing for casting operation;
the second step is that: cooling and molding the casting, namely introducing a solution into the diversion hole to enable the solution to be filled in the die until the solution is flush with the upper part of the diversion hole, stopping filling the solution, standing, controlling the cooling temperature, opening the die after molding, separating the upper die from the lower die, taking out a cylinder blank, and preparing for subsequent processing operation;
3. the painting operation of visual maintenance after casting specifically comprises the following steps:
the first step is as follows: visual inspection operation, namely placing the cast cylinder body blank on an inspection table, observing in a visual inspection mode, mainly inspecting whether the outer surface of the cylinder body blank has cracks or depressions, repairing if the cracks or the depressions exist, re-melting and remanufacturing if the cracks or the depressions cannot be repaired, performing deep processing through a lathe after the visual inspection, reaming and surface deburring operation, drilling the blocked mounting hole, removing the allowance, performing secondary visual inspection after the deep processing, and preparing subsequent processing operation after the visual inspection is qualified;
the second step is that: performing paint spraying operation, namely performing surface paint spraying operation on the cylinder body blank qualified by visual inspection, performing paint spraying operation on the surface of the cylinder body blank through a paint spraying gun, performing antioxidant paint spraying operation firstly, performing coloring paint spraying operation, performing spraying for 2-3 times in total, and performing final assembly operation after standing and airing after the paint is fully attached;
the third step: overall inspection and maintenance operation, wherein the cylinder body blank is generally inspected to check whether paint leakage exists or not and the condition of hole closing is detected, and after the cylinder body blank is checked to be correct, subsequent processing operation is prepared;
4. marking and inventory operation of cylinder body blanks specifically comprises the following steps:
the first step is as follows: marking operation is beaten to the cylinder body blank, beats mark with the suitable position of cylinder body blank and handles, and main parameter contains: the model of the cylinder body, the production date, the batch number of the cylinder body and the using environment condition of the cylinder body are subjected to final marking treatment to manufacture the cylinder body;
the second step is that: the cylinder body inventory protection operation is carried out, when the cylinder body is in inventory, the cylinder body is prevented from being wet and violent impact, and the cylinder body is packaged and stored or transported through the foam box;
5. the cylinder body installation is used, and the inside self of cylinder body is clean state, when installing or assembling again, need to pour into lubricating oil into to inside to paint sealed glue to the junction border of cylinder body, install the oil extraction bolt in the oil drain hole bottom the cylinder body simultaneously.
The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.
Claims (8)
1. The casting method of the full-automatic cylinder body is characterized by comprising the following steps:
the method comprises the following steps: preparing a casting solution, namely putting raw materials into a smelting furnace for smelting, controlling the smelting time, smelting the raw materials to form a solution, wherein a zinc material and an antioxidant material are continuously added in the smelting, after mixed smelting, sampling and extracting for inspection, the main inspection is carried out, the flowing condition of the smelting solution and the impurity-containing condition in the smelting solution are carried out, and after inspection, an upper metal liquid layer is rinsed for later use;
step two: casting operation;
step three: inspecting, maintaining and spraying paint after casting;
step four: marking and storing operation of cylinder body blanks;
step five: the cylinder body installation is used, and the inside self of cylinder body is clean state, when installing or assembling again, need to pour into lubricating oil into to inside to paint sealed glue to the junction border of cylinder body, install the oil extraction bolt in the oil drain hole bottom the cylinder body simultaneously.
2. The method for casting a full-automatic type cylinder block according to claim 1, wherein in the second step, the casting operation specifically comprises the steps of:
the first step is as follows: cleaning and maintaining the interior of the casting mold, namely firstly cleaning the interior of the casting mold, separating an upper mold and a lower mold of the casting mold, respectively cleaning the interior of the upper mold and the lower mold, removing impurities and dust, cleaning a flow guide hole of the upper mold, taking out scraps and impurities, then closing the two molds, and preparing for casting operation;
the second step is that: and (3) cooling and forming the casting, namely introducing the solution into the flow guide hole, filling the solution into the die until the solution is flush with the upper part of the flow guide hole, stopping filling the solution, standing, controlling the cooling temperature, opening the die after forming, separating the upper die from the lower die, taking out the cylinder blank, and preparing for subsequent processing operation.
3. The casting method of a fully automatic type cylinder block according to claim 1, characterized in that in step three, the maintenance painting operation of the casting back vision includes the following steps:
the first step is as follows: visual inspection operation, namely placing the cast cylinder body blank on an inspection table, observing in a visual inspection mode, mainly inspecting whether the outer surface of the cylinder body blank has cracks or depressions, repairing if the cracks or the depressions exist, re-melting and remanufacturing if the cracks or the depressions cannot be repaired, performing deep processing through a lathe after the visual inspection, reaming and surface deburring operation, drilling the blocked mounting hole, removing the allowance, performing secondary visual inspection after the deep processing, and preparing subsequent processing operation after the visual inspection is qualified;
the second step is that: performing paint spraying operation, namely performing surface paint spraying operation on the cylinder body blank qualified by visual inspection, performing paint spraying operation on the surface of the cylinder body blank through a paint spraying gun, performing antioxidant paint spraying operation firstly, performing coloring paint spraying operation, performing spraying for 2-3 times in total, and performing final assembly operation after standing and airing after the paint is fully attached;
the third step: and (4) overall inspection and maintenance operation, wherein the cylinder blank is subjected to overall inspection to check whether paint leakage exists or not, the hole closing condition is detected, and after the detection is correct, subsequent processing operation is prepared.
4. The fully automatic cylinder casting process of claim 1, wherein in step four, the cylinder blank marking inventory operation specifically includes the steps of:
the first step is as follows: marking operation is beaten to the cylinder body blank, beats mark with the suitable position of cylinder body blank and handles, and the main parameter contains: the model of the cylinder body, the production date, the batch number of the cylinder body and the using environment condition of the cylinder body are subjected to final marking treatment to manufacture the cylinder body;
the second step is that: the cylinder body inventory protection operation, during the cylinder body inventory, avoid moist, avoid violent impact to carry out encapsulation through the foam tank and preserve or the transportation operation.
5. The casting method of the full-automatic cylinder as claimed in claim 1, wherein in the step one, the melting time is set to 100 and 120 minutes, and the oxidation-resistant material is 0cr25ni20 stainless steel material.
6. The casting method of a full-automatic cylinder block according to claim 2, wherein in the second step, the casting mold in the first step is internally cleaned mainly by a nylon electric brush to remove dust and debris.
7. The casting method of a full-automatic type cylinder block according to claim 2, wherein in the second step, the cooling is performed by air cooling or water cooling, the standing time is set to 50-60 minutes, and the cooling temperature is set to 10-20 ℃.
8. The casting method of the full-automatic cylinder block according to claim 3, wherein in the third step, the visual inspection in the first step adopts LED lamp searchlighting and a magnifying glass matching visual inspection mode.
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| CN202210426133.XA CN114888245A (en) | 2022-04-21 | 2022-04-21 | Full-automatic casting method for cylinder body |
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| CN113814359A (en) * | 2021-09-06 | 2021-12-21 | 天津中科首创仪表有限公司 | Upper die gravity die-casting thin-wall metal casting process |
| CN114193110A (en) * | 2021-11-30 | 2022-03-18 | 李胜 | Manufacturing process of geological exploration drill bit |
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