Wax mold welding device and wax mold welding method

Abstract

The invention discloses a wax mold welding device and a wax mold welding method.The wax mold welding device comprises a mold loading station, a material taking mechanical arm, a bonding wax melting device and a welding device, the mold loading station is used for fixing a main pouring gate, and the material taking mechanical arm is used for grabbing a wax mold. The bonding wax melting device comprises a wax cavity and bonding wax located in the wax cavity, and the material taking mechanical arm is used for moving the wax mold to the position of the wax cavity, so that the wax mold is moved to the position of the main pouring gate after being bonded with the bonding wax. The welding device comprises a welding mechanical arm and an electric welding knife installed on the welding mechanical arm, and the electric welding knife is used for melting the welding position of the main pouring gate. According to the wax mold welding device, the main pouring gate and the wax mold are bonded through the bonding wax, the firmness of the position, welded to the wax mold, of the main pouring gate is improved, and then the welding quality of the wax mold and the main pouring gate is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wax pattern preparation, and in particular to a wax pattern assembly welding device and a wax pattern assembly welding method. Background Art

[0002] Wax model precision casting, also known as lost wax casting or investment casting, is a specific casting method: first make a model of the casting with wax material, and weld the model to the main runner with the same material to make a module (a single module can be a group when the casting is large). Dip the surface of the module in refractory paint, then sprinkle refractory sand on it, wait for it to dry and solidify, heat the module, remove the wax from the pouring gate to form an empty shell, bake the empty shell to make it a solid mold shell, pour the metal liquid from the pouring gate, and after condensation, it becomes a metal casting.

[0003] In traditional processing, an electric welding knife is usually used to heat and melt the surface of the wax mold and the main runner respectively to weld the wax mold and the main runner together. However, for some heavier parts, the welding strength of this method is low, resulting in poor welding quality between the wax mold and the main runner.

[0004] Therefore, how to improve the welding quality between the wax mold and the main runner is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a wax pattern welding device to improve the welding quality between the wax pattern and the main runner. Another object of the present invention is to provide a wax pattern welding method.

[0006] The wax mold assembly welding device provided in this application includes:

[0007] A module loading station, the module loading station is used to fix the main runner;

[0008] A material taking mechanical arm, wherein the material taking mechanical arm is used to grab the wax model;

[0009] The adhesive wax melting device comprises a wax cavity and adhesive wax located in the wax cavity, and the material taking mechanical arm is used to move the wax mold to the wax cavity position, so that the wax mold is bonded with the adhesive wax and then moved to the main runner position;

[0010] A welding device comprises a welding mechanical arm and an electric welding knife installed on the welding mechanical arm, wherein the electric welding knife is used to melt the main runner welding position.

[0011] Optionally, in the above-mentioned wax pattern welding device, the adhesive wax melting device comprises:

[0012] A fixing seat, wherein the fixing seat is provided with a mounting cavity with an opening at the top;

[0013] A wax melting pool, wherein the wax cavity is arranged in the wax melting pool, and the wax melting pool is installed in the installation cavity;

[0014] A heating device is used to heat the bonding wax in the wax cavity.

[0015] Optionally, in the above wax pattern welding device, the heating device comprises:

[0016] A bottom heating element, the bottom heating element is arranged on the bottom surface of the outer surface of the wax melting pool;

[0017] A side heating element is provided on at least one side of the side surface of the outer surface of the wax melting pool, and a wedge-shaped surface is provided on the top of the side heating element, and the top of the wedge-shaped surface is inclined in a direction away from the wax melting pool.

[0018] Optionally, in the above-mentioned wax pattern welding device, the bonding wax melting device further comprises:

[0019] a first elastic telescopic rod, wherein the bottom end of the first elastic telescopic rod is connected to the bottom of the installation cavity, and the top end of the first elastic telescopic rod is connected to the bottom end of the bottom heating element;

[0020] A second elastic telescopic rod, one end of which is connected to the side wall of the installation cavity, and the other end of which is connected to the side heating element.

[0021] Optionally, the wax pattern welding device further includes a temperature detection device for sensing the temperature of the adhesive wax in the wax melting pool, and the temperature detection device includes a thermocouple sensor arranged at a diagonal position at the bottom of the wax melting pool.

[0022] Optionally, the above-mentioned wax model assembly welding device also includes a material picking claw and an electric turntable. The movable end of the material picking robot arm is detachably connected to the material picking claw so that material picking claws of different specifications can be replaced. A workbench for placing the wax model is provided on the top of the electric turntable. The electric turntable drives the workbench to rotate, and the material picking robot arm is located on one side of the workbench.

[0023] Optionally, the above-mentioned wax model assembly welding device also includes an electric welding knife cleaning station, which is used to clean the electric welding knife. The movable end of the welding robot arm is detachably connected to the electric welding knife, and the electric welding knife cleaning station is located on the side of the welding robot arm.

[0024] Optionally, in the above wax pattern welding device, it also includes:

[0025] A fixed bottom plate, on which the module loading station, the material taking mechanical arm, the bonding wax melting device and the welding device are all installed;

[0026] A panel, the panel is arranged around the outer periphery of the edge of the fixed bottom plate, and the two ends of the panel are arranged in a circumferential direction to form openings, and the inner side of the panel is enclosed to form an operating space;

[0027] A protective door is installed on the enclosure and is used to open and close the opening.

[0028] Optionally, the above-mentioned wax model welding device also includes a control console, which is installed on the enclosure and located outside the operating space. The module loading station, the material picking robot arm, the adhesive wax melting device and the welding device are all connected to the control console signal.

[0029] A wax pattern welding method is implemented by using any of the wax pattern welding devices described above, comprising the steps of:

[0030] Fix the main runner through the die loading station;

[0031] Grab the wax model through the material taking robot arm;

[0032] The wax model is moved to the wax cavity position by the material taking mechanical arm, so that the wax model is bonded with the bonding wax and then moved to the main runner position;

[0033] The welding operation is performed by melting the main runner welding position with an electric welding knife.

[0034] In the above technical scheme, the wax model assembly welding device provided by the present invention includes a module loading station, a material picking robot arm, an adhesive wax melting device and a welding device. The module loading station is used to fix the main runner, and the material picking robot arm is used to grab the wax model. The adhesive wax melting device includes a wax cavity and adhesive wax located in the wax cavity. The material picking robot arm is used to move the wax model to the wax cavity position, so that the wax model is bonded with the adhesive wax and then moved to the main runner position. The welding device includes a welding robot arm and an electric welding knife installed on the welding robot arm, and the electric welding knife is used to melt the main runner welding position. When in use, the module loading station fixes the main runner; the material picking robot arm grabs the wax model, and the material picking robot arm moves the wax model to the wax cavity position, so that the wax model is bonded with the adhesive wax and then moved to the main runner position; the electric welding knife melts the main runner welding position to perform welding operations.

[0035] From the above description, it can be seen that in the wax pattern assembly welding device provided in the present application, the main runner and the wax pattern are bonded by adhesive wax, so as to improve the firmness of the welding position between the main runner and the wax pattern, thereby improving the welding quality between the wax pattern and the main runner. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the three-dimensional structure of a wax pattern welding device provided in an embodiment of the present invention;

[0038] Figure 2 A top view of a wax pattern welding device provided in an embodiment of the present invention;

[0039] Figure 3 A side view of a wax pattern welding device provided by an embodiment of the present invention;

[0040] Figure 4 A partial position cross-sectional view of a wax pattern assembly welding device provided in an embodiment of the present invention.

[0041] in Figure 1-4 middle:

[0042] 1-fixed bottom plate, 2-module loading station, 3-material picking robot arm, 4-fixed seat, 41-installation cavity, 5-wax pool, 6-adhesive wax, 7-first elastic telescopic rod, 8-bottom heating element, 9-second elastic telescopic rod, 10-side heating element, 101-wedge surface, 11-thermocouple sensor, 12-material picking claw, 13-electric turntable, 14-wax mold placement plate, 15-electric welding knife, 16-electric welding knife cleaning station, 17-enclosure, 18-protective door, 19-control console, 20-welding robot arm. DETAILED DESCRIPTION

[0043] The core of the present invention is to provide a wax pattern welding device to improve the welding quality between the wax pattern and the main runner. Another core of the present invention is to provide a wax pattern welding method.

[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0045] Please refer to Figures 1 to 4 .

[0046] In a specific embodiment, the wax pattern assembly welding device provided by the specific embodiment of the present invention includes a module loading station 2, a material taking mechanical arm 3, a bonding wax melting device and a welding device, the module loading station 2 is used to fix the main runner, and the material taking mechanical arm 3 is used to grab the wax pattern. Preferably, the material taking mechanical arm 3 is arranged at the rear side of the module loading station 2, that is, away from the operator.

[0047] The adhesive wax melting device includes a wax cavity and adhesive wax 6 located in the wax cavity. The material taking robot arm 3 is used to move the wax mold to the wax cavity position, so that the wax mold is bonded with the adhesive wax 6 and then moved to the main runner position. The adhesive wax melting device is arranged on the side of the material taking robot arm 3, and the welding robot arm 20 is arranged on the left side of the module loading station 2.

[0048] The welding device includes a welding mechanical arm 20 and an electric welding knife 15. The electric welding knife 15 is installed on the welding mechanical arm 20. The mechanical arm drives the electric welding knife 15 to move. The electric welding knife 15 is used to melt the welding position of the main runner and the wax mold. Preferably, the electric welding knife 15 and the welding mechanical arm 20 are detachably connected.

[0049] When in use, the module loading station 2 fixes the main runner; the material taking mechanical arm 3 grabs the wax model, and the material taking mechanical arm 3 moves the wax model to the wax cavity position, so that the wax model is bonded with the adhesive wax 6, and then moved to the main runner position; the electric welding knife 15 melts the welding position between the main runner and the wax model to perform welding operations. Specifically, the adhesive wax melting device provided in this application can be used for the preparation of turbine blade wax models.

[0050] In a specific embodiment, the adhesive wax melting device includes a fixing seat 4, a wax melting pool 5 and a heating device, wherein the fixing seat 4 is provided with a mounting cavity 41 with a top opening. The wax cavity is arranged in the wax melting pool 5, and the wax melting pool 5 is mounted in the mounting cavity 41. Specifically, the wax melting pool 5 is fixedly connected to the mounting cavity 41.

[0051] In order to facilitate the dipping of the adhesive wax 6, preferably, the heating device is used to heat the adhesive wax 6 in the wax cavity. Specifically, the heating device can be an electric heating wire, and the electric heating wire is arranged around the periphery of the wax pool 5.

[0052] In a specific embodiment, the heating device includes a bottom heating element 8 and a side heating element 10, and the bottom heating element 8 is arranged on the bottom surface of the outer surface of the wax melting pool 5. Specifically, in order to improve the connection stability, the bottom heating element 8 and the wax melting pool 5 can be fixedly connected.

[0053] At least one side of the side surface of the outer surface of the wax melting pool 5 is provided with a side heating element 10, and the top of the side heating element 10 is provided with a wedge-shaped surface 101, and the top of the wedge-shaped surface 101 is inclined in a direction away from the wax melting pool 5. By providing the wedge-shaped surface 101, it is convenient for the wax melting pool 5 to be inserted into the side heating element 10.

[0054] In order to improve the uniform heating in the wax melting pool 5, preferably, a side heating element 10 is provided on each side of the wax melting pool 5. Specifically, all the side heating elements 10 form a cylindrical structure around the circumference of the wax melting pool 5.

[0055] The adhesive wax melting device also includes a first elastic telescopic rod 7 and a second elastic telescopic rod 9, the bottom end of the first elastic telescopic rod 7 is connected to the bottom of the installation cavity 41, and the top end of the first elastic telescopic rod 7 is connected to the bottom end of the bottom heating element 8. Specifically, the push rod of the first elastic telescopic rod 7 is fixedly connected to the bottom heating element 8. Specifically, the first elastic telescopic rod 7 and the second elastic telescopic rod 9 can be spring rods provided with springs. When in use, the first elastic telescopic rod 7 and the second elastic telescopic rod 9 are in a compressed state, so that the heating device and the wax melting pool 5 are closely fitted.

[0056] One end of the second elastic telescopic rod 9 is connected to the side wall of the installation cavity 41, and the other end is connected to the side heating element 10. The push rod of the second elastic telescopic rod 9 is fixedly connected to the second heating element.

[0057] The first heating element and the second heating element can be heating plates laid on the surface of the wax melting pool 5.

[0058] During the specific assembly, the wax melting pool 5 is inserted into the installation cavity 41, and the wax melting pool 5 is fixed to the top of the fixing seat 4 by bolts. Under the action of the first elastic telescopic rod 7 and the second elastic telescopic rod 9, the first heating element and the second heating element are tightly attached to the outer wall of the wax melting pool 5, and the side wall of the wax melting pool 5 is evenly heated by the first heating element and the second heating element, so that the adhesive wax 6 in the wax melting pool 5 is in a melted state.

[0059] In a specific embodiment, the wax pattern assembly welding device further includes a temperature detection device for sensing the temperature of the adhesive wax 6 in the wax melting pool 5, and the temperature detection device includes a thermocouple sensor 11, and the thermocouple sensor 11 is arranged at the bottom diagonal of the wax melting pool 5. Preferably, a plurality of groups of thermocouple sensors 11 are installed in the wax melting pool 5, and specifically, the number of the thermocouple sensors 11 is two groups, and the thermocouple sensors 11 are installed at the bottom diagonal of the wax melting pool 5. The wax temperature in the wax melting pool 5 is measured at multiple points by the thermocouple sensors 11, so as to improve the accuracy of the wax temperature measurement in the wax melting pool 5.

[0060] In a specific embodiment, the wax model assembly welding device further includes a material taking clamp 12 and an electric turntable 13. The movable end of the material taking mechanical arm 3 is detachably connected to the material taking clamp 12 so that the material taking clamp 12 of different specifications can be replaced. A workbench for placing the wax model is provided on the top of the electric turntable 13. The electric turntable 13 drives the workbench to rotate, and the material taking mechanical arm 3 is located on one side of the workbench. Specifically, the electric turntable 13 is arranged on the right side of the material taking mechanical arm 3. A wax model placement plate 14 is fixedly installed on the top of the electric turntable 13 as a workbench. The wax model placement plate 14 is a double-station design. The wax model placement plate 14 is driven to rotate by the electric turntable 13 to realize the simultaneous wax model feeding operation and welding operation.

[0061] In a specific embodiment, the wax model assembly welding device also includes an electric welding knife cleaning station 16, which is used to clean the electric welding knife 15. The movable end of the welding robot arm 20 is detachably connected to the electric welding knife 15. The electric welding knife cleaning station 16 is located on the side of the welding robot arm 20. After each group of wax models is welded, the welding robot arm 20 moves the electric welding knife 15 to the electric welding knife cleaning station 16 for cleaning to prevent the wax model residue on the electric welding knife 15 from affecting the welding of the next group of wax models.

[0062] On the basis of the above schemes, the wax model assembly welding device further includes a fixed base plate 1, and the module loading station 2, the material taking mechanical arm 3, the bonding wax melting device and the welding device are all installed on the fixed base plate 1. Specifically, the material taking mechanical arm 3 is fixedly installed on the fixed base plate 1. Specifically, the fixed base plate 1, as a base, integrates multiple action parts of the wax model assembly welding device, facilitates overall transportation, and improves action accuracy.

[0063] The wax model assembly welding device further includes a panel 17, which is arranged around the outer periphery of the edge of the fixed bottom plate 1, and the two ends of the circumferential arrangement form openings, and the inner side of the panel 17 is enclosed to form an operating space; that is, the edges of the fixed bottom plate 1 are shielded by the panel 17. In order to improve the connection stability, preferably, the panel 17 is fixedly connected to the fixed bottom plate 1. By providing the panel 17, the working safety of the wax model assembly welding device is improved, and the staff is prevented from accidentally entering the operating space during work.

[0064] The wax pattern assembly welding device further includes a protective door 18, which is mounted on the enclosure 17 and is used to open and close the opening. The protective door 18 is movably mounted on the front side wall of the enclosure 17. Specifically, the protective door 18 can be made of the same material as the enclosure 17.

[0065] The electric turntable 13 is fixedly mounted on the right edge of the fixed base plate 1. The welding robot arm 20 is fixedly mounted on the left side of the fixed base plate 1, wherein the right side of the fixed base plate 1 refers to the right hand side of the worker when he stands at the protective door 18 and faces the operating space. The left side of the fixed base plate 1 refers to the left hand side of the worker when he stands at the protective door 18 and faces the operating space.

[0066] Specifically, the welding knife cleaning station 16 can also be fixedly installed on the upper surface of the fixed base plate 1.

[0067] In a specific embodiment, the wax model assembly welding device further includes a control console 19, which is mounted on the enclosure 17. The control console 19 is located outside the operating space, and the module loading station 2, the material taking mechanical arm 3, the adhesive wax melting device and the welding device are all connected to the control console 19 by signal. The control console 19 is located on the side of the protective door 18, and the control console 19 is movably mounted on the enclosure 17. The control console 19 is movably mounted on the enclosure 17 through a bracket, and the control console 19 is connected to the electrical components (module loading station 2, material taking mechanical arm 3, adhesive wax melting device and welding device) on the fixed bottom plate 1 through a wire. The operator can complete the setting of welding process parameters and equipment operation through the control console 19, thereby improving the safety of the worker when operating the equipment.

[0068] For ease of understanding, the following is an explanation in conjunction with a specific implementation method. The operator installs the main runner on the module loading station 2, and then the material taking robot arm 3 drives the material taking claw 12 to move to the wax model placement plate 14 to clamp the wax model to be welded, and transfers the wax model to the wax melting pool 5 to dip the adhesive wax 6. At the same time, the welding robot arm 20 drives the electric welding knife 15 to heat and melt the surface of the main runner welding position to improve the fusion between the wax materials. After that, the material taking robot arm 3 places the wax model part dipped in the adhesive wax 6 to the heated and melted position of the main runner welding position. After the welding position cools and solidifies, the wax model welding operation is completed, and the welding of the next wax model is continued until the welding of all wax models is completed.

[0069] The design of the present invention is that a bonding wax melting device is provided on the side of the material taking robot arm 3. When welding some heavy parts, the material taking robot arm 3 clamps the wax model through the material taking claws 12 and dips it into the wax melting pool 5 to dip the bonding wax 6. At the same time, the welding robot arm 20 drives the electric welding knife 15 to heat and melt the surface of the main runner welding position to improve the fusion between the wax materials. After that, the material taking robot arm 3 places the wax model part dipped in the bonding wax 6 to the heated and melted position of the main runner welding position. After the welding position is cooled and solidified, the welding operation of the wax model is completed. Since the strength of the bonding wax 6 after solidification is higher than the strength of the wax model's own material, the strength of the part welding position is improved, the wax model assembly efficiency is improved, the firmness of the main runner and the wax model welding position is improved, and the welding quality of the wax model and the main runner is improved.

[0070] The present application provides a wax model assembly welding method, which is implemented by the above-mentioned wax model assembly welding device, and includes the following steps: fixing the main runner by the module loading station 2. Grabbing the wax model by the material taking robot arm 3. Moving the wax model to the wax cavity position by the material taking robot arm 3, so that the wax model is bonded with the adhesive wax 6 and then moved to the main runner position. Melting the main runner welding position by the electric welding knife 15, and performing welding operation. The above-mentioned specific structure of the wax model assembly welding device is described, and the present application includes the above-mentioned wax model assembly welding device, which also has the above-mentioned technical effects.

[0071] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0072] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wax pattern welding device, characterized in that: include: A module loading station (2), wherein the module loading station (2) is used to fix the main runner; A material taking mechanical arm (3), wherein the material taking mechanical arm (3) is used to grab the wax model; The adhesive wax melting device comprises a wax cavity and adhesive wax (6) located in the wax cavity, and the material taking mechanical arm (3) is used to move the wax model to the wax cavity position, so that the wax model is bonded with the adhesive wax (6) and then moved to the main runner position; A welding device comprises a welding mechanical arm (20) and an electric welding knife (15) mounted on the welding mechanical arm (20), wherein the electric welding knife (15) is used to melt a main runner welding position.

2. The wax pattern welding device according to claim 1, characterized in that: The bonding wax melting device comprises: A fixing seat (4), wherein the fixing seat (4) is provided with a mounting cavity (41) with an opening at the top; A wax melting pool (5), the wax cavity being arranged in the wax melting pool (5), and the wax melting pool (5) being installed in the installation cavity (41); A heating device is used to heat the adhesive wax (6) in the wax cavity.

3. The wax pattern welding device according to claim 2, characterized in that: The heating device comprises: A bottom heating element (8), the bottom heating element (8) being arranged on the bottom surface of the outer surface of the wax melting pool (5); A side heating element (10), wherein at least one side of the side surface of the outer surface of the wax melting pool (5) is provided with the side heating element (10), and a wedge-shaped surface (101) is provided at the top end of the side heating element (10), and the top end of the wedge-shaped surface (101) is inclined in a direction away from the wax melting pool (5).

4. The wax pattern welding device according to claim 3, characterized in that: The bonding wax melting device also includes: A first elastic telescopic rod (7), wherein the bottom end of the first elastic telescopic rod (7) is connected to the bottom of the installation cavity (41), and the top end of the first elastic telescopic rod (7) is connected to the bottom end of the bottom heating element (8); A second elastic telescopic rod (9), one end of the second elastic telescopic rod (9) is connected to the side wall of the installation cavity (41), and the other end is connected to the side heating element (10).

5. The wax pattern welding device according to claim 3, characterized in that: It also comprises a temperature detection device for sensing the temperature of the adhesive wax (6) in the wax melting pool (5), wherein the temperature detection device comprises a thermocouple sensor (11) arranged at a diagonal position at the bottom of the wax melting pool (5).

6. The wax pattern welding device according to claim 1, characterized in that: It also includes a material picking clamp (12) and an electric turntable (13). The movable end of the material picking mechanical arm (3) is detachably connected to the material picking clamp (12) so that material picking clamps (12) of different specifications can be replaced. A workbench for placing wax models is provided on the top of the electric turntable (13). The electric turntable (13) drives the workbench to rotate. The material picking mechanical arm (3) is located on one side of the workbench.

7. The wax pattern welding device according to claim 1, characterized in that: It also comprises an electric welding knife cleaning station (16), wherein the electric welding knife cleaning station (16) is used to clean the electric welding knife (15), the movable end of the welding mechanical arm (20) is detachably connected to the electric welding knife (15), and the electric welding knife cleaning station (16) is located on the side of the welding mechanical arm (20).

8. The wax pattern welding device according to any one of claims 1 to 7, characterized in that: Also includes: A fixed base plate (1), the module loading station (2), the material taking mechanical arm (3), the bonding wax melting device and the welding device are all installed on the fixed base plate (1); A surrounding plate (17), the surrounding plate (17) is arranged around the outer periphery of the edge of the fixed bottom plate (1), and the two ends of the surrounding plate (17) are formed with openings, and the inner side of the surrounding plate (17) is enclosed to form an operating space; A protective door (18), the protective door (18) is installed on the enclosure (17) and is used to open and close the opening.

9. The wax pattern welding device according to claim 8, characterized in that: It also includes a control console (19), which is installed on the enclosure (17). The control console (19) is located outside the operating space. The module loading station (2), the material taking robot arm (3), the adhesive wax melting device and the welding device are all connected to the control console (19) by signal.

10. A wax pattern welding method, characterized in that: The method is realized by the wax pattern welding device according to any one of claims 1 to 9, comprising the steps of: Fixing the main runner via the die loading station (2); Grabbing the wax model by a material taking mechanical arm (3); The wax model is moved to the wax cavity position by a material taking mechanical arm (3), so that the wax model is bonded with bonding wax (6) and then moved to the main runner position; The main runner welding position is melted by an electric welding knife (15) to perform welding operation.

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