CN110238007B - Preparation method of cladding coating on surface of ball core of high-end ball valve and cooling device for preparation - Google Patents
Preparation method of cladding coating on surface of ball core of high-end ball valve and cooling device for preparation Download PDFInfo
- Publication number
- CN110238007B CN110238007B CN201910658512.XA CN201910658512A CN110238007B CN 110238007 B CN110238007 B CN 110238007B CN 201910658512 A CN201910658512 A CN 201910658512A CN 110238007 B CN110238007 B CN 110238007B
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- ball core
- air gun
- coating
- ball
- cladding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
- B05B13/0228—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts the movement of the objects being rotative
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0426—Cooling with air
-
- 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
- B05D2258/00—Small objects (e.g. screws)
-
- 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
- B05D2259/00—Applying the material to the internal surface of hollow articles other than tubes
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a preparation method of a cladding coating on the surface of a ball core of a high-end ball valve and a cooling device for preparation, wherein the cooling device comprises a rotating tool, and the rotating tool comprises a ball core fixing part and a rotating driving mechanism for driving the fixing part and driving the ball core to rotate around the axis of a runner port around the ball core; the air gun device comprises a hot air gun acting on the outer surface of the ball core and a cold air gun acting on the inner wall surface of the runner opening of the ball core, the air outlet flow velocity and the air outlet temperature of the hot air gun and the cold air gun are adjustable, and can horizontally move back and forth in the axial direction of the runner opening and can also vertically move back and forth. After cladding, on one hand, the thermal expansion coefficients of the outer surface coating of the ball core and the inner coating of the runner mouth are adjusted to match with the thermal contraction of the ball core; on the other hand, the coating on the outer surface of the ball core is blown to heat preservation by hot air, and meanwhile, the coating in the pipeline opening is blown to cool by cold air. The invention can effectively avoid the cracking and falling of the ball core coating, thereby increasing the yield.
Description
Technical Field
The invention belongs to the technical field of valve processing, and particularly relates to a preparation method of a cladding coating on the surface of a ball core of a high-end ball valve and a cooling device for preparation.
Background
With the rapid development of the valve industry at present, the surface of the high-end ball valve needs to have better surface performance. How does its performance be guaranteed? We generally resort to some advanced surface engineering techniques. These techniques include: surface coating, surface spraying, surface heat treatment, and some surface strengthening processes.
The prior art firstly carries out thermal spraying on the surface of the ball core, namely a flame spraying mode forms a layer of coating on the surface; the coating is flame sprayed, the porosity of the coating is high, and the adhesive force is insufficient, so that the coating has no means to meet the requirements on the surface strength and the bonding strength of the coating and the matrix; in order to improve the basic performance of the coating, a hot-melt coating method is generally adopted to strengthen the coating, and the coating is heated to a molten state, so that the void ratio of the coating is further reduced, and meanwhile, the binding force with a substrate is further improved, so that the high surface performance is achieved.
However, some problems are found in the process of cladding the surface of the ball core, and the main problem is that the coating is detached in some local areas, particularly the places of the flow passage opening.
Disclosure of Invention
In order to solve the problem of partial falling of the coating, the invention improves the preparation process of the surface coating of the ball core of the high-end ball valve, and provides a preparation method of the cladding coating of the ball core of the high-end ball valve and a cooling device for preparation.
After the melting and coating is finished, the outer wall surface of the coating is the outer surface, so that the cooling speed of the outer surface of the spherical coating is higher, and then the coating in the flow passage opening is the matrix, namely the matrix is cooled most slowly. This causes the shrinkage rate of the core outer wall surface coating and the gate inner wall surface coating to be inconsistent due to inconsistent cooling rates, and at the edges of the gate and the outer surface of the ball, at the transition region, the gate edge belongs to the sharp region due to inconsistent shrinkage of the outer wall surface and the inner wall, belongs to the stress concentration region, and under the condition of inconsistent shrinkage, and the stress concentration, the coating is easily broken and dropped at the point.
In order to solve the technical problems of coating cracking and falling, the invention adopts the following technical scheme: a cooling device for preparing a cladding coating on the surface of a ball core of a high-end ball valve comprises the following components:
the rotary tool comprises a ball core fixing part and a rotary driving mechanism, wherein the rotary driving mechanism is used for driving the fixing part and driving the ball core to rotate around the ball core around the axis of the runner port;
the air gun device comprises a hot air gun acting on the outer surface of the ball core and a cold air gun acting on the inner wall surface of the runner opening of the ball core, wherein the hot air gun and the cold air gun can horizontally move back and forth in the axial direction of the runner opening, fixed-point blowing is avoided, the air gun device can also vertically move back and forth, and the air outlet flow velocity and the air outlet temperature of the hot air gun and the cold air gun are adjustable.
Further, the fixing part is a chuck for fixing the ball core from the inside of the runner port.
Further, the air gun device further comprises an air gun frame, a horizontal guide rail axially parallel to a ball core runner opening mounted on the fixing portion is arranged on the air gun frame, a first sliding block is slidably matched with the horizontal guide rail, a vertical guide rail is arranged on the first sliding block, a second sliding block is slidably matched with the vertical guide rail, an air gun support is arranged on the second sliding block, the air gun and the cold air gun are arranged on the air gun support along the vertical direction at intervals, the distance between the air gun and the cold air gun is matched with the ball core, and a first sliding block driving mechanism and a second sliding block driving mechanism are further arranged on the air gun frame.
The high-end ball valve ball core surface coating cladding method based on the cooling device for preparing the high-end ball valve ball core surface cladding coating comprises the following steps:
step 1, mounting a ball core subjected to sand blasting on the rotary tool, starting the rotary driving mechanism, spraying a coating on the surface of the ball core and in a ball core flow channel opening respectively, and standing for later use after the spraying is finished;
step 2, placing the ball core sprayed with the coating in the step 1 in a vacuum furnace for cladding, driving the ball core to rotate through the rotating tool after cladding is finished, driving the air gun device and enabling the hot air gun and the cold air gun to horizontally move back and forth in the axial direction of the runner port, preserving heat of the coating on the outer surface of the ball core through the hot air gun, and cooling of the coating in the runner port of the ball core through the cold air gun;
in the step 1, the thermal expansion coefficient of the inner coating of the ball core flow passage opening is smaller than that of the outer coating of the ball core, the air outlet flow velocity and the air outlet temperature of the hot air gun are matched with the thermal expansion coefficient of the inner coating of the ball core flow passage opening to be adjusted, the outer coating of the ball core is consistent with the shrinkage of the ball core, and the air outlet flow velocity and the air outlet temperature of the cold air gun are matched with the thermal expansion coefficient of the inner coating of the ball core flow passage opening to be adjusted, so that a compressive stress coating is formed.
The invention has the technical effects that: the cracking and falling of the ball core coating can be effectively avoided, so that the yield is increased.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of cooling a cladding coating on the surface of a ball core of a high-end ball valve according to the invention.
FIG. 2 is a schematic view (partial cross-sectional view) of a surface coating for a high-end ball valve core according to the present invention.
FIG. 3 is a schematic structural view of a gun device in the cooling device for preparing the cladding coating on the surface of the ball core of the high-end ball valve.
In the figure: 1. the ball core comprises a ball core, an outer surface coating layer of the ball core, an inner coating layer of a ball core flow passage opening, a fixing part, a hot air gun, a cold air gun, 331, a horizontal guide rail, 332, a first slide block, 333, a vertical guide rail, 334, a second slide block and 335 air gun brackets.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 3, a cooling device for preparing a cladding coating on the surface of a ball core of a high-end ball valve comprises a rotating tool and a wind gun device, wherein the rotating tool comprises a ball core fixing part 21 and a rotating driving mechanism, and the rotating driving mechanism is used for driving the fixing part 21 and driving the ball core 1 to rotate around the ball core around a runner port axis. The fixed part of the embodiment selects a lathe rotating air-actuated three-jaw chuck produced by Changzhou fine clamping mechanical limited company device, and when in use, the clamping jaw stretches out towards the inner wall at one side of the runner port to prop against the inner wall, so that the ball core can synchronously rotate along with the chuck. The rotation driving mechanism may be a chuck rotation driving device commonly used in the prior art, such as a motor for rotationally driving the chuck through a belt or a gear or the like.
The air gun device comprises a hot air gun 31 and a cold air gun 32, wherein the hot air gun 31 is applied to the outer surface of the ball core, the cold air gun 32 is applied to the inner wall surface of a runner port of the ball core, the hot air gun 31 and the cold air gun 32 can horizontally move back and forth in the axial direction of the runner port and can also horizontally move back and forth in the vertical direction, and the air outlet flow rates and the air outlet temperatures of the hot air gun 31 and the cold air gun 32 are adjustable.
The air gun device further comprises an air gun frame, a horizontal guide rail 331 axially parallel to the ball core runner opening mounted on the fixing portion is arranged on the air gun frame, a first sliding block 332 is slidably matched with the horizontal guide rail 331, a vertical guide rail 333 is arranged on the first sliding block 332, a second sliding block 334 is slidably matched with the vertical guide rail (333), an air gun support 335 is arranged on the second sliding block 334, the air gun 31 and the cold air gun 32 are arranged on the air gun support 335 along the vertical direction at intervals, and the distance between the air gun 31 and the cold air gun 32 is matched with the ball core 1, and a first sliding block driving mechanism and a second sliding block driving mechanism are further arranged on the air gun frame. The first and second slider drives may be linear drive mechanisms conventional in the art, such as electric pushers, ball screws, or may be intermeshing motor driven rack and pinion drive mechanisms. In the embodiment, the TZ series servo sliding table electric module linear guide rail sliding table is selected to drive the hot air gun and the cold air gun to linearly move. The high-temperature heat gun HG series produced by Guangzhou long electromechanical equipment limited company is selected as the heat air gun, the power is more than 10kw, the outlet temperature is more than 300 ℃, and the flow rate is controllable. The cold air is supplied by an industrial air source, the pressure is 4 to 5 kg, and the diameter of the nozzle is 6 mm.
The cladding method of the surface coating of the ball core of the high-end ball valve is carried out by adopting the cooling device for preparing the cladding coating of the ball core of the high-end ball valve, and comprises the following steps:
step 1, installing the ball core subjected to sand blasting on the rotary tool, starting the rotary driving mechanism, spraying coatings on the surface of the ball core and in the ball core flow passage opening respectively, and standing for later use after spraying is finished.
Specifically, firstly, processing the ball core, reserving the size, and ensuring that the size of the processed coating meets the design requirement, so that the size detection is required before the coating is coated; after meeting the requirements, carrying out sand blasting treatment to meet the requirements of the surface on the roughness, and then keeping the surface for not more than 2 hours to avoid oxidation or other pollution of the outer surface; then, adding a fixture, and placing on a rotating table for spraying; the spraying is carried out by adopting a conventional flame spray gun; firstly preheating the flame of the ball core to more than 150 ℃, and then spraying; the coating spraying uses the linear speed of the surface treated by the coating as a stay reference of a spray gun, namely, the linear speed is in direct proportion to the stay time; when the coating reaches at least 1.3 times of the reserved thickness, standing the sprayed ball core for 2 hours, observing whether obvious defects exist on the surface, if not, performing heat treatment, and if so, performing repair spraying or re-spraying; after the task is completed, the next step, namely a cladding stage, is carried out.
Step 2, placing the ball core sprayed with the coating in the step 1 in a vacuum furnace for cladding, driving the ball core 1 to rotate through the rotating tool after cladding is finished, driving the air gun device and enabling the hot air gun 31 and the cold air gun 32 to horizontally move back and forth in the axial direction of the runner port, and simultaneously keeping the heat of the coating 11 on the outer surface of the ball core by the hot air gun 31 and cooling the coating 12 in the runner port by the cold air gun 32;
in the step 1, the thermal expansion coefficient of the inner coating of the ball core flow passage opening is less than that of the outer coating of the ball core, and less than that of the ball core;
in step 2, the air flow rate and the air temperature of the air gun 31 are adjusted in accordance with the thermal expansion coefficient of the inner coating of the flow passage opening of the ball core, so that the outer coating 11 of the ball core is consistent with the shrinkage of the ball core and stress concentration is avoided, and the air flow rate and the air temperature of the air gun 32 are adjusted in accordance with the thermal expansion coefficient of the inner coating 12 of the flow passage opening of the ball core, so that a compressive stress coating is formed.
In this embodiment, the core is made of 316 stainless steel (SS 316), the inner coating of the core flow passage opening and the outer coating of the core are respectively Ni55 and Ni60 coatings, the composition is shown in table 1, the thermal expansion coefficient of the inner coating of the core flow passage opening is about 1/8 of that of SS316, and the thermal expansion coefficient of the outer coating of the core is about 1/5 of that of SS 316.
Table 1 mass percent of each component in the coating (balance Ni)
The caliber of the ball core is DN100, and the rotating speed of the ball core is 30 revolutions per minute. The air gun bracket 335 drives the hot air gun and the cold air gun to move back and forth at a speed of 30cm per second in the horizontal direction, wherein the outlet wind speed of the hot air gun is 15m/s, the outlet wind speed of the cold air gun is 10m/s, and the outlet calibers are all 6mm; the flow rate was varied up and down to 30%. The outlet air temperature of the hot air gun is designed to be about 300 ℃, and the spherical surface temperature close to the transition zone is mainly controlled to be about 250 ℃, so that the local temperature non-uniformity caused by fixed-point blowing is avoided. The outlet air temperature of the cold air gun is designed to be 25 ℃, but the flow rate of the cold air gun is small, the flow rate is small, the cooling speed in the pipeline opening is increased, and the pipeline opening cannot be purged at a certain point. The flow rate of the hot air gun 31 is small first and then large, the temperature of the outer surface in the later period is maintained, the flow rate of the cold air gun 7 is small first and then small, the temperature of the inner wall is rapidly reduced in the earlier period, the small flow rate is used for reducing the outlet wind speed by 30%, and the large flow rate is used for increasing the outlet wind speed by 30%. The cooling capacity is formulated according to the size of the part, and if the part is large, corresponding parameters need to be adjusted, so that the stability of temperature change of an excessive area is mainly ensured.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme and the concept of the present invention, and should be covered by the scope of the present invention.
Claims (4)
1. A cooling device for preparing a cladding coating on the surface of a ball core of a ball valve is characterized in that: comprising the following steps:
the rotary tool comprises a ball core fixing part (21) and a rotary driving mechanism, wherein the rotary driving mechanism is used for driving the fixing part (21) and driving the ball core (1) to rotate around the axis of a ball core runner port;
the air gun device comprises a hot air gun (31) and a cold air gun (32), wherein the hot air gun (31) is applied to the outer surface of the ball core, the cold air gun (32) is applied to the inner wall surface of a runner port of the ball core, the hot air gun (31) and the cold air gun (32) can horizontally move back and forth in the axial direction of the runner port and can also horizontally move back and forth in the vertical direction, and the air outlet flow velocity and the air outlet temperature of the hot air gun (31) and the cold air gun (32) are adjustable.
2. The cooling device for preparing a cladding coating on a surface of a ball core of a ball valve according to claim 1, wherein: the fixing part (21) is a chuck for fixing the ball core from one side of the runner port.
3. The cooling device for preparing a cladding coating on a surface of a ball core of a ball valve according to claim 1, wherein: the air gun device further comprises an air gun frame, a horizontal guide rail (331) axially parallel to a ball core runner opening mounted on the fixing portion is arranged on the air gun frame, a first sliding block (332) is slidably matched on the horizontal guide rail (331), a vertical guide rail (333) is arranged on the first sliding block (332), a second sliding block (334) is slidably matched on the vertical guide rail (333), an air gun support (335) is arranged on the second sliding block (334), the air gun (31) and the cold air gun (32) are arranged on the air gun support (335) along the vertical direction at intervals, and the distance between the air gun (31) and the cold air gun (32) is matched with the ball core (1), and a first sliding block driving mechanism and a second sliding block driving mechanism are further arranged on the air gun frame.
4. A cladding method of a ball core surface coating of a ball valve is characterized by comprising the following steps: the method is carried out by using the cooling device for preparing the cladding coating on the surface of the ball core of the ball valve according to any one of claims 1 to 3, and comprises the following steps:
step 1, mounting a ball core subjected to sand blasting on the rotary tool, starting the rotary driving mechanism, spraying a coating on the surface of the ball core and in a ball core flow channel opening respectively, and standing for later use after the spraying is finished;
step 2, placing the ball core sprayed with the coating in the step 1 in a vacuum furnace for cladding, driving the ball core (1) to rotate through the rotating tool after cladding is finished, and simultaneously driving a hot air gun device and enabling a hot air gun (31) and a cold air gun (32) to horizontally move back and forth in the axial direction of a runner port, wherein the hot air gun (31) is used for preserving heat of the coating (11) on the outer surface of the ball core, and the cold air gun (32) is used for cooling the coating (12) in the runner port of the ball core;
in the step 1, the thermal expansion coefficient of the inner coating of the ball core flow passage opening is less than that of the outer coating of the ball core, and less than that of the ball core;
in the step 2, the air outlet flow speed and the air outlet temperature of the hot air gun (31) are adjusted by matching with the thermal expansion coefficient of the inner coating of the ball core flow passage opening, the outer surface coating (11) of the ball core is consistent with the shrinkage of the ball core, and the air outlet flow speed and the air outlet temperature of the cold air gun (32) are adjusted by matching with the thermal expansion coefficient of the inner coating (12) of the ball core flow passage opening, so that a compressive stress coating is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910658512.XA CN110238007B (en) | 2019-07-19 | 2019-07-19 | Preparation method of cladding coating on surface of ball core of high-end ball valve and cooling device for preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910658512.XA CN110238007B (en) | 2019-07-19 | 2019-07-19 | Preparation method of cladding coating on surface of ball core of high-end ball valve and cooling device for preparation |
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| Publication Number | Publication Date |
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| CN110238007A CN110238007A (en) | 2019-09-17 |
| CN110238007B true CN110238007B (en) | 2023-10-10 |
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| DE4423459C1 (en) * | 1994-07-05 | 1995-06-08 | Vogelsang Ernst Gmbh Co Kg | Integral forming of socket end on ethylene@] pipe |
| JP2007203228A (en) * | 2006-02-03 | 2007-08-16 | Freunt Ind Co Ltd | Coating device and coating method |
| CN201170342Y (en) * | 2008-03-28 | 2008-12-24 | 辽宁华运控制设备制造有限公司 | Tungsten carbide ceramic-metal composite wear-resistant ball valve |
| CN101954322A (en) * | 2009-07-17 | 2011-01-26 | 江苏江恒阀业有限公司 | Speed-variable supersonic flame spraying spherical device |
| CN102218392A (en) * | 2011-04-25 | 2011-10-19 | 江阴市恒润法兰有限公司 | Method for repairing surface crack of continuous casting loop-forming element |
| CN103451649A (en) * | 2013-09-22 | 2013-12-18 | 浙江工贸职业技术学院 | Ball valve spherical surface laser cladding positioning mechanism |
| CN206298644U (en) * | 2016-12-20 | 2017-07-04 | 吴忠仪表有限责任公司 | A kind of small core cladding mandrel |
| CN207364324U (en) * | 2017-07-28 | 2018-05-15 | 上海金萃激光技术有限公司 | One kind rotation valve core |
-
2019
- 2019-07-19 CN CN201910658512.XA patent/CN110238007B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4423459C1 (en) * | 1994-07-05 | 1995-06-08 | Vogelsang Ernst Gmbh Co Kg | Integral forming of socket end on ethylene@] pipe |
| JP2007203228A (en) * | 2006-02-03 | 2007-08-16 | Freunt Ind Co Ltd | Coating device and coating method |
| CN201170342Y (en) * | 2008-03-28 | 2008-12-24 | 辽宁华运控制设备制造有限公司 | Tungsten carbide ceramic-metal composite wear-resistant ball valve |
| CN101954322A (en) * | 2009-07-17 | 2011-01-26 | 江苏江恒阀业有限公司 | Speed-variable supersonic flame spraying spherical device |
| CN102218392A (en) * | 2011-04-25 | 2011-10-19 | 江阴市恒润法兰有限公司 | Method for repairing surface crack of continuous casting loop-forming element |
| CN103451649A (en) * | 2013-09-22 | 2013-12-18 | 浙江工贸职业技术学院 | Ball valve spherical surface laser cladding positioning mechanism |
| CN206298644U (en) * | 2016-12-20 | 2017-07-04 | 吴忠仪表有限责任公司 | A kind of small core cladding mandrel |
| CN207364324U (en) * | 2017-07-28 | 2018-05-15 | 上海金萃激光技术有限公司 | One kind rotation valve core |
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| CN110238007A (en) | 2019-09-17 |
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