CN112453321A - Wax mold welding device for precision casting and welding method thereof - Google Patents
Wax mold welding device for precision casting and welding method thereof Download PDFInfo
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- CN112453321A CN112453321A CN202011366266.XA CN202011366266A CN112453321A CN 112453321 A CN112453321 A CN 112453321A CN 202011366266 A CN202011366266 A CN 202011366266A CN 112453321 A CN112453321 A CN 112453321A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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Abstract
The invention discloses a wax mold welding device for precision casting, which comprises a working box with an opening at the upper end, wherein two clamping mechanisms are arranged in the working box, each clamping mechanism comprises a clamping box, the clamping boxes are connected between a partition plate and the inner side wall of the working box in a sliding manner, the inner side wall of each clamping box is rotatably connected with a horizontally arranged threaded rod, two sections of threads with opposite rotating directions are arranged on the threaded rods, clamping sleeves are sleeved on the two sections of threads in a threaded manner, connecting blocks are fixedly connected to the side walls, close to the center of the working box, of the two clamping sleeves, and the connecting blocks penetrate through the side walls of the clamping boxes in a sliding manner and are fixedly connected with movable plates. By arranging the clamping mechanism, the wax molds on the two sides can be always kept in the middle position of the clamping box after being clamped, so that the welding accuracy is higher; through setting up adjustment mechanism, and diversified heating when a plurality of shower nozzles of accessible for welding efficiency promotes by a wide margin.
Description
Technical Field
The invention relates to the technical field related to wax pattern manufacturing and home processing equipment, in particular to a wax pattern welding device for precision casting and a welding method thereof.
Background
Wax patterns are a common casting method. Investment casting mainly comprises the processes of mold manufacturing, wax pattern manufacturing, shell mold manufacturing, drying, roasting, pouring, solidification and the like, wherein splicing of the wax patterns is an extremely important step, and the precision of splicing of the wax patterns can greatly influence the precision of subsequent finished products.
However, in the general process of welding the wax pattern, the workpiece is manually heated by the iron block to dissolve the wax pattern, and then the wax pattern is manually spliced.
Disclosure of Invention
The invention aims to provide a wax mold welding device for precision casting, which solves the problems of poor welding precision and low efficiency in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a wax pattern welding device for precision casting comprises a working box with an opening at the upper end, wherein two clamping mechanisms are arranged in the working box, each clamping mechanism comprises a clamping box, the clamping boxes are connected between a partition board and the inner side wall of the working box in a sliding manner, the inner side wall of each clamping box is rotatably connected with a threaded rod horizontally arranged, two threads with opposite rotating directions are arranged on the threaded rods, clamping sleeves are sleeved on the two threads, connecting blocks are fixedly connected on the side walls, close to the center of the working box, of the two clamping sleeves, the connecting blocks penetrate through the side walls of the clamping boxes in a sliding manner and are fixedly connected with movable plates, clamping plates are arranged on the side walls, opposite to the movable plates, the clamping plates are fixedly connected with the movable plates through a plurality of springs, the partition boards are vertically arranged in the working box, and are fixedly connected to the inner side walls of, form the drive chamber between baffle and the work box inside wall, two the one end that the threaded rod is close to the drive chamber all rotates and runs through the centre gripping box lateral wall and extends to the inboard setting of drive chamber, be equipped with in the drive chamber and be used for driving threaded rod pivoted actuating mechanism, work box lateral wall fixedly connected with transmission box, be equipped with the adjustment mechanism who is used for adjusting centre gripping box position in the transmission box, fixedly connected with annular frame between baffle and the work box inside wall, be equipped with the cavity in the annular frame, a plurality of shower nozzles of annular frame inside wall fixedly connected with, the shower nozzle is linked together with the cavity is inside, the annular frame upside is equipped with the feed mechanism who is used for supplying with the welding energy.
Preferably, the threaded rod on the outer side of the clamping box is rotatably sleeved with a bearing, the bearing penetrates through the partition plate in a sliding manner, and a strip-shaped groove matched with the bearing is formed in the partition plate in a penetrating manner.
Preferably, the side wall of the clamping box is provided with a sliding groove matched with the connecting block in a penetrating manner, and the connecting block is connected with the sliding groove in a sliding manner.
Preferably, actuating mechanism includes the pivot that the level set up, the pivot rotates to be connected in drive intracavity lateral wall, is in all fixed the helical gear that has cup jointed in threaded rod in the drive intracavity and the pivot, and two are relative helical gear intermeshing, workbin lateral wall fixed mounting has the motor, the rotation of motor output run through the workbin lateral wall and with the coaxial fixed connection of one of them end of pivot.
Preferably, the supply mechanism includes the heating cabinet, heating cabinet fixed connection is in annular frame upper end, the heating otter board of two vertical settings of heating cabinet inside wall fixedly connected with, heating cabinet upper end fixed mounting has the power, power and two heating otter board electric connection.
Preferably, an air pump is fixedly mounted at the upper end of the annular frame, the output end of the air pump is communicated with the inside of the heating box, the heating box is communicated with the inside of the cavity through an output pipe, and the input end of the air pump is communicated with the outside.
Preferably, adjustment mechanism includes the dwang that the level set up, fixed cover has been connect two thread bushings on the dwang, and two the screw thread of thread bushing is turned to on the contrary, two equal thread sleeve has been cup jointed adjusting sleeve, two on the thread bushing the adjusting sleeve is close to the lateral wall of centre gripping box on equal fixedly connected with regulating block, the regulating block slides and runs through transmission box and work box lateral wall and with centre gripping box lateral wall fixed connection, dwang wherein one end is rotated and is run through transmission box and fixedly connected with and rotate the handle.
Preferably, the use method of the welding device comprises the following steps:
the method comprises the following steps: two wax matrix that will need the welded carry out the centre gripping through two fixture and actuating mechanism respectively, through the centre gripping of two centre gripping plates for two wax matrix all are in the central point of centre gripping box all the time and put, carry out accurate position to subsequent welding and prescribe a limit to.
Step two: the two clamping boxes are adjusted to move towards the direction close to each other through the adjusting mechanism, the welding parts of the two wax molds are in butt contact in the annular frame, and the pressure is kept between 0.05Mpa and 0.1 Mpa.
Step three: the hot air supply is carried out through the supply mechanism, so that the heating air is sprayed out through the spray head and acts on the connecting part of the wax mould, and the temperature of the air is controlled between 50 ℃ and 60 ℃ through the heating action of the heating box to carry out the welding of the wax mould.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by arranging the clamping mechanism and the driving mechanism, due to the arrangement of two sections of threads with opposite rotating directions on the threaded rod and the uniform driving property of the same driving mechanism, the two clamping sleeves can push the two movable plates and the clamping plates to be close to each other at the same time, so that the wax molds at two sides are always positioned at the middle position of the clamping box after being clamped, the positions of the wax molds at two sides are always kept constant, and the welding accuracy is higher.
2. According to the invention, the adjusting mechanism and the annular frame are arranged, and due to the transmission characteristic of the adjusting mechanism, when the clamping boxes on the two sides move towards the direction close to each other, the moving speed and the moving process are always kept consistent, so that the converging position of the wax molds on the two sides is always kept at the central position in the working box, namely the middle part of the annular frame, and further, the multiple spray heads on the inner side wall of the annular frame can be used for heating, dissolving and splicing simultaneously, the welding accuracy is further enhanced, and meanwhile, the multiple spray heads can be used for heating simultaneously and in multiple directions, so that the welding efficiency is greatly improved.
Drawings
FIG. 1 is a sectional view of a top view of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1 according to the present invention.
In the figure: 1. a work box; 2. a clamping box; 3. a threaded rod; 4. a clamping sleeve; 5. connecting blocks; 6. a movable plate; 7. a clamping plate; 8. a spring; 9. a partition plate; 10. a drive chamber; 11. a transmission box; 12. an annular frame; 13. a cavity; 14. a spray head; 15. a bearing; 16. a strip-shaped groove; 17. a sliding groove; 18. a rotating shaft; 19. a helical gear; 20. a motor; 21. a heating box; 22. heating the screen plate; 23. a power source; 24. an air pump; 25. an output pipe; 26. rotating the rod; 27. a threaded sleeve; 28. an adjustment sleeve; 29. an adjusting block; 30. the handle is rotated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention is shown:
a wax mold welding device for precision casting comprises a working box 1 with an opening at the upper end, two clamping mechanisms are arranged in the working box 1, each clamping mechanism comprises a clamping box 2, the clamping boxes 2 are connected between the inner side walls of the working box 1 in a sliding manner, the inner side walls of the clamping boxes 2 are rotatably connected with a horizontally arranged threaded rod 3, two sections of threads with opposite rotating directions are arranged on the threaded rods 3, clamping sleeves 4 are sleeved on the two sections of threads in a uniform threaded manner, connecting blocks 5 are fixedly connected to the side walls, close to the center of the working box 1, of the two clamping sleeves 4, the connecting blocks 5 penetrate through the side walls of the clamping boxes 2 in a sliding manner and are fixedly connected with movable plates 6, clamping plates 7 are arranged on the side walls, opposite to the two movable plates 6, the clamping plates 7 are fixedly connected with the movable plates 6 through a plurality of springs 8, it is worth mentioning that, the connecting block 5 is slidably connected with the sliding groove 17.
According to the invention, a vertically arranged partition plate 9 is arranged in a working box 1, the partition plate 9 is fixedly connected to the inner side wall of the working box 1, a driving cavity 10 is formed between the partition plate 9 and the inner side wall of the working box 1, one ends of two threaded rods 3 close to the driving cavity 10 are rotatably penetrated through the side wall of a clamping box 2 and extend to the inner side of the driving cavity 10, a bearing 15 is rotatably sleeved on the threaded rod 3 positioned on the outer side of the clamping box 2, the bearing 15 is slidably penetrated through the partition plate 9, and a strip-shaped groove 16 matched with the bearing 15 is penetrated through the partition plate 9.
In the invention, a driving mechanism for driving the threaded rod 3 to rotate is arranged in the driving cavity 10, the driving mechanism comprises a rotating shaft 18 which is horizontally arranged, the rotating shaft 18 is rotatably connected to the inner side wall of the driving cavity 10, the threaded rod 3 in the driving cavity 10 and the rotating shaft 18 are fixedly sleeved with helical gears 19, the two opposite helical gears 19 are mutually meshed, it is noted that a plurality of limiting strips are fixedly connected to the rotating shaft 18, clamping grooves matched with the limiting strips are formed in the inner sides of the helical gears 19 on the rotating shaft, the helical gears 19 can translate on the rotating shaft 18 and can simultaneously rotate, a motor 20 is fixedly arranged on the outer side wall of the working box 1, and the output end of the motor 20 rotatably penetrates through the side wall of the working box 1 and is coaxially and fixedly connected with one end.
According to the invention, the outer side wall of the work box 1 is fixedly connected with a transmission box 11, an adjusting mechanism for adjusting the position of the clamping box 2 is arranged in the transmission box 11, the adjusting mechanism comprises a horizontally arranged rotating rod 26, two thread sleeves 27 are fixedly sleeved on the rotating rod 26, the thread turning directions of the two thread sleeves 27 are opposite, adjusting sleeves 28 are sleeved on the two thread sleeves 27 in a threaded manner, adjusting blocks 29 are fixedly connected on the side walls of the two adjusting sleeves 28 close to the clamping box 2, the adjusting blocks 29 slidably penetrate through the side walls of the transmission box 11 and the work box 1 and are fixedly connected with the outer side wall of the clamping box 2, and one end of the rotating rod 26 rotatably penetrates through the transmission box 11 and is fixedly connected with a rotating handle.
According to the invention, due to the arrangement of the clamping mechanism and the driving mechanism, two sections of threads with opposite screwing directions on the threaded rod 3 are arranged, and the uniform driving performance of the same driving mechanism, the two clamping sleeves 4 can push the two movable plates 6 and the clamping plate 7 to be close to each other simultaneously, so that the wax molds on two sides are always positioned in the middle position of the clamping box 2 after being clamped, the positions of the wax molds on two sides are always kept constant, and the welding accuracy is higher.
In the invention, an annular frame 12 is fixedly connected between the partition board 9 and the inner side wall of the working box 1, a cavity 13 is arranged in the annular frame 12, a plurality of spray heads 14 are fixedly connected to the inner side wall of the annular frame 12, and the spray heads 14 are communicated with the interior of the cavity 13.
According to the invention, a supply mechanism for supplying welding energy is arranged on the upper side of the annular frame 12, the supply mechanism comprises a heating box 21, the heating box 21 is fixedly connected to the upper end of the annular frame 12, two vertically arranged heating screen plates 22 are fixedly connected to the inner side wall of the heating box 21, a power supply 23 is fixedly arranged at the upper end of the heating box 21, the power supply 23 is electrically connected with the two heating screen plates 22, an air pump 24 is fixedly arranged at the upper end of the annular frame 12, the output end of the air pump 24 is communicated with the inside of the heating box 21, the heating box 21 is communicated with the inside of the cavity 13 through an output.
According to the invention, due to the arrangement of the adjusting mechanism and the annular frame 12, due to the transmission characteristic of the adjusting mechanism, when the clamping boxes 2 on two sides move towards the direction close to each other, the movement speed and the movement process are always kept consistent, the converging positions of the wax molds on two sides are always kept in the central position in the working box 1, namely the middle of the annular frame 12, and then the multiple spray heads 14 on the inner side wall of the annular frame 12 can be used for simultaneous heating, dissolving and splicing, so that the welding accuracy is further enhanced, and meanwhile, the multiple spray heads 14 can be used for simultaneous and multidirectional heating, so that the welding efficiency is greatly improved.
In the invention, the use method of the welding device comprises the following steps:
the method comprises the following steps: two wax matrix that will need the welded carry out the centre gripping through two fixture and actuating mechanism respectively, through the centre gripping of two grip blocks 7 for two wax matrix all are in the central point that centre gripping box 2 put all the time, carry out accurate position to subsequent welding and prescribe a limit to.
Step two: the two clamping boxes 2 are adjusted to move towards the direction close to each other through the adjusting mechanism, the welding parts of the two wax molds are in butt contact in the annular frame 12, and the pressure is kept between 0.05Mpa and 0.1 Mpa.
Step three: hot air is supplied through the supply mechanism, so that the heating air is sprayed out through the spray head 14 and acts on the connecting part of the wax pattern, and the temperature of the air is controlled between 50 ℃ and 60 ℃ through the heating action of the heating box 21 to weld the wax pattern.
The working principle is as follows: the wax mold is placed between the two clamping plates 7, the output end of a motor 20 is started to rotate in the forward direction at the moment, the output end of the motor 20 drives a rotating shaft to rotate, the rotation of the rotating shaft 18 is transmitted to the threaded rod 3 through a bevel gear 19, so that the two clamping sleeves 4 on the threaded rod 3 move towards directions close to each other, and the movable plate 6 and the clamping plates 7 are driven to mutually close through a connecting block 5, at the moment, the two clamping plates 7 clamp the wax mold, the clamping force of the two clamping plates 7 on the wax mold is increased along with the gradual compression of a spring 8, after the clamping is stable, the motor 20 is closed, and after the wax molds on the two sides are clamped, the clamping and the fixing of the wax;
after the clamping is finished, the rotating handle 30 is rotated in the forward direction, the rotating handle 30 drives the rotating rod 26 and the threaded sleeve 27 to rotate, at the moment, the two adjusting sleeves 28 move towards the directions close to each other, the two clamping boxes 2 are driven to move simultaneously through the adjusting block 29, the bevel gear 19 on the rotating shaft 18 translates along the limiting strip on the rotating shaft 18, when the two wax molds abut against each other in the annular frame 12, the air pump 24 and the heating screen plate 22 are started, at the moment, the air pump 24 outputs air into the heating box 21 through the output end, the air passes through the heating screen plates 22 on the two sides, the air is heated and then is output into the cavity 13 through the output pipe 25 and sprayed out from the spray head 14 to spray the surface of the wax mold, so that the wax mold is melted, at the moment, the rotating handle can be rotated in a small amplitude, the wax molds are mutually spliced, when the splicing degree is certain, the, the output end of the starting motor 20 rotates reversely, and the wax mold can be taken down along with the mutual separation of the clamping plates 7.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The utility model provides a wax matrix welding set for precision casting, is equipped with open-ended work box (1) including the upper end, its characterized in that: the clamping device is characterized in that two clamping mechanisms are arranged in the working box (1), each clamping mechanism comprises a clamping box (2), the clamping boxes (2) are connected between the inner side walls of the working box (1) in a sliding manner, the inner side walls of the clamping boxes (2) are rotatably connected with horizontally arranged threaded rods (3), two sections of threads with opposite rotating directions are arranged on the threaded rods (3), clamping sleeves (4) are sleeved on the two sections of threads, connecting blocks (5) are fixedly connected to the side walls, close to the center of the working box (1), of the two clamping sleeves (4), each connecting block (5) penetrates through the side wall of each clamping box (2) in a sliding manner and is fixedly connected with a movable plate (6), clamping plates (7) are arranged on the side walls, opposite to the movable plates (6), each clamping plate (7) is fixedly connected with the corresponding movable plate (6) through a plurality of springs (8), and a partition plate (9) which, the novel screw driver is characterized in that the partition plate (9) is fixedly connected to the inner side wall of the working box (1), a driving cavity (10) is formed between the partition plate (9) and the inner side wall of the working box (1), two threaded rods (3) are arranged at one ends, close to the driving cavity (10), of the two threaded rods (3) and penetrate through the side wall of the clamping box (2) in a rotating mode and extend to the inner side of the driving cavity (10), a driving mechanism used for driving the threaded rods (3) to rotate is arranged in the driving cavity (10), a transmission box (11) is fixedly connected to the outer side wall of the working box (1), an adjusting mechanism used for adjusting the position of the clamping box (2) is arranged in the transmission box (11), an annular frame (12) is fixedly connected between the partition plate (9) and the inner side wall of the working box (1), a cavity (13) is arranged in the annular frame (12), a plurality of spray, and a supply mechanism for supplying welding energy is arranged on the upper side of the annular frame (12).
2. A wax pattern welding apparatus for precision casting according to claim 1, wherein: be in rotate on the threaded rod (3) in centre gripping box (2) outside and cup jointed bearing (15), bearing (15) slide and run through baffle (9) setting, just run through on baffle (9) and be equipped with bearing (15) assorted bar groove (16).
3. A wax pattern welding apparatus for precision casting according to claim 1, wherein: the clamping box is characterized in that a sliding groove (17) matched with the connecting block (5) penetrates through the side wall of the clamping box (2), and the connecting block (5) is connected with the sliding groove (17) in a sliding mode.
4. A wax pattern welding apparatus for precision casting according to claim 1, wherein: actuating mechanism includes pivot (18) that the level set up, pivot (18) rotate to be connected in drive chamber (10) inside wall, are in threaded rod (3) in drive chamber (10) and pivot (18) are gone up all to fix and have connect helical gear (19), and two are relative helical gear (19) intermeshing, workbin (1) lateral wall fixed mounting has motor (20), motor (20) output rotate run through workbin (1) lateral wall and with pivot (18) one of them one end coaxial fixed connection.
5. A wax pattern welding apparatus for precision casting according to claim 1, wherein: supply with mechanism includes heating cabinet (21), heating cabinet (21) fixed connection is in annular frame (12) upper end, heating cabinet (21) inside wall fixedly connected with heating otter board (22) of two vertical settings, heating cabinet (21) upper end fixed mounting has power (23), power (23) and two heating otter board (22) electric connection.
6. A wax pattern welding apparatus for precision casting according to claim 5, wherein: annular frame (12) upper end fixed mounting has air pump (24), air pump (24) output and heating cabinet (21) are inside to be linked together, heating cabinet (21) are inside to be linked together through output tube (25) and cavity (13), air pump (24) input is linked together with the external world.
7. A wax pattern welding apparatus for precision casting according to claim 1, wherein: adjustment mechanism includes dwang (26) that the level set up, fixed cover has been connected two thread bush (27) on dwang (26), and two the screw thread of thread bush (27) is turned to on the contrary, two adjusting sleeve (28), two have been cup jointed to equal screw thread on thread bush (27) adjusting sleeve (28) are close to equal fixedly connected with regulating block (29) on the lateral wall of centre gripping box (2), regulating block (29) slide run through transmission box (11) and work box (1) lateral wall and with centre gripping box (2) lateral wall fixed connection, dwang (26) wherein one end is rotated and is run through transmission box (11) and fixedly connected with and rotate handle (30).
8. A wax pattern welding apparatus for precision casting according to claims 1 to 7, wherein: the use method of the welding device comprises the following steps:
the method comprises the following steps: two wax matrix that will need the welded carry out the centre gripping through two fixture and actuating mechanism respectively, through the centre gripping of two grip blocks (7) for two wax matrix all are in the central point that centre gripping box (2) all the time and put, carry out accurate position to subsequent welding and prescribe a limit to.
Step two: the two clamping boxes (2) are adjusted to move towards the direction close to each other through the adjusting mechanism, the welding parts of the two wax molds are in butt contact in the annular frame (12), and the pressure is kept between 0.05MPa and 0.1 MPa.
Step three: hot air is supplied through the supply mechanism, so that the heating air is sprayed out through the spray head (14) and acts on the connecting part of the wax mould, and the temperature of the air is controlled between 50 ℃ and 60 ℃ through the heating action of the heating box (21) to weld the wax mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011366266.XA CN112453321A (en) | 2020-11-29 | 2020-11-29 | Wax mold welding device for precision casting and welding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011366266.XA CN112453321A (en) | 2020-11-29 | 2020-11-29 | Wax mold welding device for precision casting and welding method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112453321A true CN112453321A (en) | 2021-03-09 |
Family
ID=74809414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011366266.XA Withdrawn CN112453321A (en) | 2020-11-29 | 2020-11-29 | Wax mold welding device for precision casting and welding method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112453321A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113547069A (en) * | 2021-07-21 | 2021-10-26 | 黄秋红 | Lost foam casting wax mold manufacturing and processing technology |
| CN116713431A (en) * | 2023-08-10 | 2023-09-08 | 东营市宏宇精铸设备有限责任公司 | Automatic wax matrix welding equipment for investment casting |
-
2020
- 2020-11-29 CN CN202011366266.XA patent/CN112453321A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113547069A (en) * | 2021-07-21 | 2021-10-26 | 黄秋红 | Lost foam casting wax mold manufacturing and processing technology |
| CN116713431A (en) * | 2023-08-10 | 2023-09-08 | 东营市宏宇精铸设备有限责任公司 | Automatic wax matrix welding equipment for investment casting |
| CN116713431B (en) * | 2023-08-10 | 2023-10-10 | 东营市宏宇精铸设备有限责任公司 | Automatic wax matrix welding equipment for investment casting |
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Application publication date: 20210309 |
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