CN113618644A - Tool nozzle for manual shot blasting and method for improving quality of turbine shell runner - Google Patents
Tool nozzle for manual shot blasting and method for improving quality of turbine shell runner Download PDFInfo
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- CN113618644A CN113618644A CN202110862792.3A CN202110862792A CN113618644A CN 113618644 A CN113618644 A CN 113618644A CN 202110862792 A CN202110862792 A CN 202110862792A CN 113618644 A CN113618644 A CN 113618644A
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- turbine shell
- shot blasting
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- hole
- nozzle
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- 238000005422 blasting Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005266 casting Methods 0.000 claims abstract description 50
- 239000007921 spray Substances 0.000 claims abstract description 14
- 230000007704 transition Effects 0.000 claims description 33
- 239000011248 coating agent Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 18
- 238000003618 dip coating Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 229910052845 zircon Inorganic materials 0.000 claims description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 5
- 239000004576 sand Substances 0.000 abstract description 13
- 230000003746 surface roughness Effects 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000003973 paint Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
- B24C5/04—Nozzles therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The application relates to a tool nozzle for manual shot blasting and a method for improving quality of a turbine shell runner, and belongs to the technical field of casting. In order to solve the problem that when a turbine shell is cast by a runner core, the quality of the runner of the turbine shell is influenced by the surface roughness of the runner core and the collapsibility of runner sand, and the traditional shot blasting nozzle cannot perform shot blasting on residual impurities in the runner, so that the quality of the runner of the turbine shell is low. The tool spray head is provided with a through hole which penetrates through two sides along the axial direction; the through hole is of a multi-step structure with gradually changed size along the radial direction; and the large-size step end of the through hole is connected with a shot blasting machine, and a tool nozzle is held by hand to enter the flow channel for shot blasting. Meanwhile, a method for improving the quality of the turbine shell runner is provided, the runner sand core is dip-coated before casting, the surface smoothness of the runner sand core is improved, the runner sand is prevented from collapsing in the casting process, and the casting quality is improved; and after casting, a flow passage shot blasting process is carried out by using the tool nozzle, so that the flow passage quality of the turbine shell is improved from multiple aspects.
Description
Technical Field
The application relates to a tool nozzle for manual shot blasting and a method for improving quality of a turbine shell runner, and belongs to the technical field of casting.
Background
With the development of the heat-resistant steel turbocharger industry, higher requirements are put forward on a core part turbine shell in the heat-resistant steel turbocharger. The amount of gas lost into and out of the turbine housing determines the operating efficiency of the turbocharger. The compactness of the turbine shell and the openness of the gas flow passage are to ensure that the energy loss of the gas is minimized. In order to ensure the above characteristics of the turbine shell, when the turbine shell is cast, the traditional casting method is to manufacture the runner core before casting the whole body.
The traditional casting method can meet the compactness of the turbine shell, but also has certain influence on the quality of a gas flow passage of the turbine shell. The roughness of the outer surface of the mud core of the flow channel directly influences the surface roughness of the inner wall of the flow channel of the turbine shell after casting; the collapsibility of the runner precoated sand of the runner core in the casting process and the quality of the runner of the turbine shell can be influenced by residual black sand and paint in the cast runner of the turbine shell.
In the prior art, residual black sand and paint in the runner are removed by performing a shot blasting process. However, the flow passage of the turbine shell is a built-in inner hole with a complex shape. Because the size of the traditional shot blasting machine nozzle is large, the traditional shot blasting machine nozzle cannot enter the interior of a turbine shell, so that residual black sand and paint in a runner cannot be thoroughly removed. If change the shower nozzle for long and thin class tubulose shower nozzle, though can get into inside the turbine shell, because the change of shower nozzle size, the compressed air of the junction of shot-blasting machine outlet duct and shower nozzle can take place gas vortex phenomenon because of the size change, causes the shot to carry out the striking to the outlet duct wall, and the outlet duct is damaged appears, appears the shower nozzle even because of the shot condition of taking place to block up.
Disclosure of Invention
To solve the problems and the defects in the prior art, the application provides the tool nozzle for manual shot blasting and the method for improving the quality of the turbine shell flow passage, the tool nozzle is connected with the air outlet pipe of the shot blasting machine, the tool nozzle can be held by hand and enters the interior of the turbine shell to perform a shot blasting process, and the tool nozzle is provided with a plurality of step-shaped through holes with gradually changed radial sizes; the part of the sprayer body where the small-size step end of the through hole is positioned forms a nozzle; the shot can be ejected from the nozzle one by one through the effect of shot blasting machine, can not take place to block up, and the setting of many steps also can make compressed air pass through according to the stage, avoids the vortex phenomenon, improves the impeller blasting effect of turbine shell runner. The runner sand core is dip-coated, so that the surface roughness of the runner sand core can be increased, the integrity of the runner sand can be ensured in the casting process of the runner sand core, and the casting quality is improved.
In order to achieve the above purpose, the present application provides the following technical solutions: a tool nozzle for manual shot blasting comprises a nozzle main body, wherein the nozzle main body is provided with a through hole which penetrates through two sides along the axial direction; the through hole is of a multi-step structure with gradually changed size along the radial direction; the large-size step end of the through hole is connected with an air outlet pipe of the shot blasting machine, and the part of the nozzle main body where the small-size step end of the through hole is located forms a nozzle of the tool nozzle; the handheld tool spray head enters from a runner port of a workpiece to be processed, and a shot blasting process is carried out on the runner of the workpiece to be processed by changing the direction of the spray nozzle.
Specifically, the through hole is a three-step through hole; the three-step-shaped through hole is divided into a large-size step end, a transition step end and a small-size step end according to the aperture. The three-step-shaped through hole is formed, compressed air of the shot blasting machine can pass through the three-step-shaped through hole one by one, the aperture of each step is gradually reduced, the compressed air cannot generate a gas vortex phenomenon, and the shot blasting effect of the tool spray head is guaranteed.
Specifically, a positioning pin and a positioning through hole are arranged at the end of the large-size step; a positioning hole is formed in the position, corresponding to the positioning pin, of the air outlet pipe of the shot blasting machine, and a positioning pin is arranged in the position, corresponding to the positioning through hole, of the shot blasting machine; when the large-size step end is connected with the air outlet pipe, the positioning pins and the positioning through holes respectively correspond to the positioning holes and the positioning pins one to one. The large-size step end of the tooling nozzle is provided with the positioning pin and the positioning through hole, so that the rapid connection with the outlet pipe of the shot blasting machine can be realized, the working efficiency is improved, the firm connection between the tooling nozzle and the outlet pipe can be ensured when the positioning through hole is connected with the positioning pin, and the good stability of connection between the tooling nozzle and the outlet pipe in the use process is realized.
Specifically, the two sides of the transition step end are respectively provided with a large end transition part and a small end transition part; the large end transition part and the small end transition part are structures with the hole diameters gradually reduced along the axial direction; the transition step end is respectively communicated with the large-size step end and the small-size step end through the large-end transition part and the small-end transition part. The big end transition part and the small end transition part are set to be of a structure with the aperture gradually reduced along the axial direction, and the structure is also used for enabling compressed air to pass through the nozzle along the axial direction of the aperture gradually reduced when the radial size of the nozzle is changed, so that the phenomenon of gas vortex is avoided.
Specifically, the method for improving the quality of the turbine shell flow passage comprises the following steps:
step 1: dip-coating a mud core of a turbine shell runner; dip-coating the turbine shell runner core in casting coating liquid; taking out and drying after treatment;
step 2: putting the turbine shell runner core treated in the step 1 into a turbine shell mold, and performing a pouring casting process; obtaining a turbine shell casting blank;
and step 3: and (3) carrying out a manual shot blasting process on the flow channel of the turbine shell casting blank obtained in the step (2) by using a tool nozzle for manual shot blasting.
Specifically, when the step 1 is used for carrying out a step of dip-coating a mud core of a turbine shell runner, the casting mold coating liquid is made of zircon powder; the dip coating is carried out twice:
the first pass is as follows: controlling the baume degree of the casting mold coating liquid to be 64-67, and placing the mud core of the turbine shell runner into a coating stirring barrel for standing for 3-5 seconds; taking out, drying and naturally cooling;
the second time: re-preparing the concentration of the casting mold coating liquid, and controlling the Baume degree to be 67-70; placing the turbine shell runner core subjected to the first treatment and natural cooling into a coating stirring barrel and standing for 3-5 seconds; taking out, drying and naturally cooling. The casting mold coating made of zircon powder is used for dip-coating the runner sand core before casting, so that the surface smoothness of the runner sand core is improved, and a compact sintering layer is formed on the surface of the runner sand core in order to enable the runner sand core to react with casting liquid in the casting process, so that the sand sticking is prevented, the integrity of the runner sand core is also ensured, and the condition of sand scattering of the runner is prevented.
Specifically, when the manual shot blasting process of the turbine shell runner is performed in the step 3, the manual shot blasting process is performed in two steps:
the first step is as follows: the manual shot blasting tool nozzle is used for manually shot blasting, and the manual shot blasting of the wall of the flow passage is carried out by aiming at the air inlet of the turbine shell; the shot blasting time is 40-60 seconds;
the second step is that: the hand-held manual shot blasting tool nozzle is put into the turbine shell from the center hole in the front side of the turbine shell; the turbine shell is held by hand to rotate, and meanwhile, the tool nozzle is held by hand to perform manual shot blasting on the inner cavity of the flow channel of the turbine shell; the shot blasting time is 50-60 seconds. The shot blasting procedure is carried out in two steps, and the residual black sand and paint on different parts of the turbine shell runner are removed by different shot blasting methods, so that the residual black sand and paint can be thoroughly removed, and the shot blasting effect of the turbine shell runner is improved.
Compared with the prior art, the beneficial effect of this application lies in:
1. this application is connected with the shot-blasting machine outlet duct through setting up the frock shower nozzle, can hand the frock shower nozzle and get into the inside shot-blasting process that carries out of turbine shell runner, effectively is applicable to heat-resistant steel single current way, double-flow way and exhaust pipe class turbine shell, improves the application scope of shot-blasting machine.
2. The tool nozzle is provided with a multi-step through hole with gradually changed radial size; the part of the sprayer body where the small-size step end of the through hole is positioned forms a nozzle; the shot can be ejected from the nozzle one by one through the effect of the shot blasting machine, the blockage can not occur, the multi-step arrangement can also enable compressed air to pass through according to stages, the vortex phenomenon is avoided, the shot blasting effect of the turbine shell runner is improved, and the quality of the turbine shell runner is improved.
3. The runner sand core is dip-coated, so that the surface roughness of the runner sand core can be increased, the runner sand can be dispersed in the casting process of the runner sand core, the integrity of the runner sand core is ensured, and the casting quality of the turbine shell is improved. Meanwhile, the procedure of casting the turbine shell runner by hand is carried out, so that residual black sand and paint in the casting process can be effectively removed, and the surface quality of the inner cavity of the turbine shell runner is improved.
Drawings
FIG. 1 is a schematic view of a tool nozzle according to the present embodiment;
fig. 2 is a dimension diagram of a part of the tooling nozzle of the present embodiment.
In the figure: 1. a large-sized step end; 2. a transition step end; 3. a small-sized step end; 4. positioning pins; 5. a big end transition; 6. a small end transition portion; 7. a nozzle; 8. a nozzle body; 9. and positioning the through hole.
Detailed Description
The present application will be further explained with reference to the drawings in the examples of the present application.
Referring to fig. 1-2, the embodiment discloses a tool nozzle for manual shot blasting, which comprises a nozzle body 8, wherein the nozzle body 8 is provided with a through hole which axially penetrates through two sides; the through hole is of a multi-step structure with gradually changed size along the radial direction; the large-size step end 1 of the through hole is connected with an air outlet pipe of the shot blasting machine, and a nozzle 7 of the tool spray head is formed at the main body part of the spray head where the small-size step end 3 of the through hole is located; the hand-held tool spray head enters from a runner port of the workpiece to be processed, and the shot blasting process is carried out on the runner of the workpiece to be processed by changing the direction of the nozzle 7. The basic working requirement of the tool spray head is met.
Further, the through hole is a three-step through hole; the three-step-shaped through hole is divided into a large-size step end 1, a transition step end 2 and a small-size step end 3 according to the aperture. The formation of the through-hole is realized.
Further, the large-size step end 1 is provided with a positioning pin 4 and a positioning through hole 9; a positioning hole is formed in the position, corresponding to the positioning pin 4, of the air outlet pipe of the shot blasting machine, and a positioning pin is arranged in the position, corresponding to the positioning through hole 9, of the air outlet pipe of the shot blasting machine; when the large-size step end 1 is connected with the air outlet pipe, the positioning pins 4 and the positioning through holes 9 respectively correspond to the positioning holes and the positioning pins one to one. The connection between the large-size step end 1 and the air outlet pipe of the shot blasting machine is realized.
Furthermore, a large end transition part 5 and a small end transition part 6 are respectively arranged on two sides of the transition step end 2; the large end transition part 5 and the small end transition part 6 are structures with the hole diameters gradually reduced along the axial direction; the transition step end 2 is communicated with the large-size step end 1 and the small-size step end 3 through a large-end transition part 5 and a small-end transition part 6, respectively. The formation of the transition step end 2 is achieved.
A method for improving the quality of a turbine shell flow passage comprises the following steps:
step 1: dip-coating a mud core of a turbine shell runner; dip-coating the turbine shell runner core in casting coating liquid; taking out and drying after treatment;
step 2: putting the turbine shell runner core treated in the step 1 into a turbine shell mold, and performing a pouring casting process; obtaining a turbine shell casting blank;
and step 3: and (3) carrying out a manual shot blasting process on the flow channel of the turbine shell casting blank obtained in the step (2) by using a tool nozzle for manual shot blasting.
Further, when the step 1 is used for dip-coating the sand core of the turbine shell runner, the casting mold coating liquid is made of zircon powder; the dip coating is carried out twice:
the first pass is as follows: controlling the baume degree of the casting mold coating liquid to be 64-67, and placing the mud core of the turbine shell runner into a coating stirring barrel for standing for 3-5 seconds; taking out, drying and naturally cooling;
the second time: re-preparing the concentration of the casting mold coating liquid, and controlling the Baume degree to be 67-70; placing the turbine shell runner core subjected to the first treatment and natural cooling into a coating stirring barrel and standing for 3-5 seconds; taking out, drying and naturally cooling.
Further, when the manual shot blasting process of the turbine shell runner is carried out in the step 3, the process is carried out in two steps:
the first step is as follows: the manual shot blasting tool nozzle is used for manually shot blasting, and the manual shot blasting of the wall of the flow passage is carried out by aiming at the air inlet of the turbine shell; the shot blasting time is 40-60 seconds;
the second step is that: the hand-held manual shot blasting tool nozzle is put into the turbine shell from the center hole in the front side of the turbine shell; the turbine shell is held by hand to rotate, and meanwhile, the tool nozzle is held by hand to perform manual shot blasting on the inner cavity of the flow channel of the turbine shell; the shot blasting time is 50-60 seconds.
The working principle is as follows: 1. firstly, manufacturing a tool spray head according to the size of the part in the figure 2, and connecting a large-size step end 1 of the tool spray head with an air outlet pipe of the shot blasting machine.
2. Preparing casting mold coating liquid by using zircon powder, controlling the baume degree of the coating liquid to be 64-67, standing the turbine shell runner core in the coating liquid for 3-5 seconds, taking out the runner core, drying and naturally cooling.
3. And (4) re-preparing the concentration of the coating liquid, controlling the Baume degree to be 67-70, standing the cooled runner core in the coating liquid for 3-5 seconds, taking out, drying and cooling.
4. And (4) putting the flow channel loam core subjected to dip-coating treatment into a turbine shell mold, and carrying out a pouring casting process to prepare a turbine shell casting blank.
4. And performing a shot blasting process on the turbine shell casting blank, wherein when shot blasting is performed on a turbine shell flow passage, a tool spray head is held by hand to aim at an air inlet pipe orifice of the turbine shell, a nozzle 5 of the tool spray head aims at the flow passage pipe wall to perform shot blasting, and shot blasting time is 40-60 seconds.
5. The hand-held manual shot blasting tool nozzle is put into the turbine shell from the center hole in the front side of the turbine shell; the turbine shell is held by hand to rotate, and meanwhile, the tool nozzle is held by hand to perform manual shot blasting on the inner cavity of the flow channel of the turbine shell; the shot blasting time is 50-60 seconds. And finishing the flow passage shot blasting process of the turbine shell.
By the method and the process, the surface smoothness of the sand core of the turbine shell runner is controlled before casting, the sand core of the runner is prevented from collapsing and adhering during casting, and the casting quality is ensured. And meanwhile, after casting, a shot blasting process is carried out by using a special tool nozzle, so that the quality of a heat-resistant steel turbine shell runner is improved from multiple aspects. The surface quality of the inner cavity of the heat-resistant steel turbine shell runner required by production is achieved. The service performance of the turbocharger and the power of the engine are ensured.
The present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent changes and substitutions without departing from the principle of the present invention after learning the content of the present invention, and these equivalent changes and substitutions should be considered as belonging to the protection scope of the present invention.
Claims (7)
1. The utility model provides a manual frock shower nozzle for throwing ball, includes the shower nozzle main part, its characterized in that: the spray head main body is provided with a through hole which penetrates through two sides along the axial direction; the through hole is of a multi-step structure with gradually changed radial size; the large-size step end of the through hole is connected with an air outlet pipe of the shot blasting machine, and a nozzle of the tool nozzle is formed at the part of the nozzle main body where the small-size step end of the through hole is located; and the tool spray head is held by hand to enter from a runner port of the workpiece to be processed, and the direction of the nozzle is changed to perform a shot blasting process on the runner of the workpiece to be processed.
2. The tool nozzle for manual blasting according to claim 1, wherein: the through hole is a three-step-shaped through hole; the three-step-shaped through hole is divided into a large-size step end, a transition step end and a small-size step end according to the aperture.
3. The tool nozzle for manual blasting according to claim 2, wherein: the large-size step end is provided with a positioning pin and a positioning through hole; a positioning hole is formed in the position, corresponding to the positioning pin, of the shot blasting machine air outlet pipe, and a positioning pin is arranged in the position, corresponding to the positioning through hole, of the shot blasting machine air outlet pipe; when the large-size step end is connected with the air outlet pipe, the positioning pins and the positioning through holes respectively correspond to the positioning holes and the positioning pins one to one.
4. The tool nozzle for manual blasting according to claim 3, wherein: a large end transition part and a small end transition part are respectively arranged on two sides of the transition step end; the large end transition part and the small end transition part are structures with the hole diameters gradually reduced along the axial direction; the transition step end is respectively communicated with the large-size step end and the small-size step end through the large-end transition part and the small-end transition part.
5. A method for improving the quality of a turbine shell flow passage is characterized by comprising the following steps: the method comprises the following steps:
step 1: dip-coating a mud core of a turbine shell runner; dip-coating the turbine shell runner core in casting coating liquid; taking out and drying after treatment;
step 2: putting the turbine shell runner core treated in the step 1 into a turbine shell mold, and performing a pouring casting process; obtaining a turbine shell casting blank;
and step 3: and (3) carrying out a manual shot blasting process on the flow channel of the turbine shell casting blank obtained in the step (2) by using the tool nozzle for manual shot blasting, which is disclosed in any one of claims 1-4.
6. The method of claim 5, wherein the step of increasing the quality of the turbine casing flow path comprises: when the step 1 is used for dip-coating the sand core of the turbine shell runner, the casting mold coating liquid is made of zircon powder; the dip coating is carried out twice:
the first pass is as follows: controlling the baume degree of the casting mold coating liquid to be 64-67, and placing the mud core of the turbine shell runner into a coating stirring barrel for standing for 3-5 seconds; taking out, drying and naturally cooling;
the second time: re-preparing the concentration of the casting mold coating liquid, and controlling the Baume degree to be 67-70; placing the turbine shell runner core subjected to the first treatment and natural cooling into a coating stirring barrel and standing for 3-5 seconds; taking out, drying and naturally cooling.
7. The method of claim 5, wherein the step of increasing the quality of the turbine casing flow path comprises: when the manual shot blasting process of the turbine shell runner is carried out in the step 3, the process is carried out in two steps:
the first step is as follows: the manual shot blasting tool nozzle is held by hand, and the manual shot blasting of the wall of the flow passage is carried out by aiming at the air inlet of the turbine shell; the shot blasting time is 40-60 seconds;
the second step is that: the manual shot blasting tool nozzle is held by hand and is put into the turbine shell from the center hole in the front side of the turbine shell; the hand-held turbine shell rotates, and meanwhile, the hand-held manual shot blasting tool nozzle performs manual shot blasting on the inner cavity of the flow channel of the turbine shell; the shot blasting time is 50-60 seconds.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114800288A (en) * | 2022-04-25 | 2022-07-29 | 中国航发成都发动机有限公司 | Shot blasting device for blisk of high-pressure compressor |
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CN106001507A (en) * | 2016-07-19 | 2016-10-12 | 上海华培动力科技有限公司 | Low-pressure casting process for turbine shell of turbocharger |
CN206912976U (en) * | 2017-05-18 | 2018-01-23 | 江苏电力装备有限公司 | Bend pipe peener |
CN110682215A (en) * | 2019-08-16 | 2020-01-14 | 浙江海洋大学 | High-pressure rust removal spray head |
CN210998229U (en) * | 2019-11-20 | 2020-07-14 | 江苏亿达铸造机械有限公司 | Sand blasting head capable of smoothly discharging sand |
CN110977788A (en) * | 2019-12-31 | 2020-04-10 | 长安大学 | Tool and method for removing burrs of aero-engine oil nozzle by abrasive flow process |
CN112571300A (en) * | 2020-11-30 | 2021-03-30 | 中国石油集团渤海钻探工程有限公司 | Double-gradient abrasive nozzle with rectification structure |
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