TWI850581B - Gas copper furnace head manufacturing method and sand core inner mold used for manufacturing the same - Google Patents

Abstract

This invention uses the side guide columns with protruding shapes on the side wall surface of the base of the sand core inner mold and the grooves and protruding positioning columns near the clamping section of the tube of the sand core inner mold, so that the side guide columns, the clamping section and the positioning columns are respectively accommodated in the fixed concave part of the metal lower mold, and after the metal upper and lower molds are closed, the sand core inner mold can be suspended at the predetermined position of the metal upper and lower molds. After (A) material preparation, (B) spraying, (C) mold placement, (D) pouring and pressurization, (E) cooling and sampling, (F) vibration cleaning, (G) material replenishment, (H) polishing, (I) hole and groove processing, (J) flattening, and (K) finished product, a copper furnace head with an air chamber, mixing tube, and flame hole can be completed.

Description

Gas copper furnace head manufacturing method and sand core inner mold used for its manufacturing

The present invention relates to a method for manufacturing a gas copper furnace head; in particular, to a method for manufacturing a gas copper furnace head capable of improving yield and production capacity and a sand core inner mold for use in its manufacturing.

According to the commonly used method of manufacturing gas copper furnace head, the method is as follows:

(A) Material preparation and processing: Purchase or make a sand core inner mold of a predetermined shape and size required for a gas copper furnace head, and prepare an earth and sand upper and lower molds for accommodating the sand core inner mold; wherein the sand core inner mold includes a ring base and a pipe connected to the ring base, and a clamping section is formed at the end of the pipe; and the earth and sand upper and lower molds are respectively formed with predetermined recessed positions of predetermined shapes and sizes;

(B) First placement of pads: Place multiple pads evenly spaced at the bottom of the inner wall at the predetermined position of the soil and sand lower mold, and the pads are preferably made of styrofoam;

(C) Place the sand core inner mold: Place the top plane of the ring base of the sand core inner mold gently downward on the top of the pad and in the predetermined position of the soil and sand lower mold. At the same time, the clamping section of the other end of the sand core inner mold can be located at the other end of the predetermined position of the soil and sand lower mold;

(D) Place the pads again: Arrange multiple pads at equal distances on the bottom plane of the ring base of the sand core inner mold;

(E) Closing the mold: Cover the upper mold with the lower mold, and form the inner mold of the sand core, which can be suspended between the predetermined positions of the upper and lower molds by the pads at the top and bottom planes;

(F) Pouring process: pouring the molten copper alloy liquid directly from the pouring port of the clay sand upper mold, so that the molten copper alloy liquid directly flows into and fills the predetermined positions of the clay sand upper and lower molds, the sides of the sand core inner mold and the pouring port;

(G) Cooling sampling process: When the molten copper alloy liquid is cooled to near room temperature, the solidified copper alloy material can be directly clamped from the pouring port and then pulled out with force so that it can be separated from the upper and lower molds of the clay sand to obtain a primary embryo mold with an inner mold covering the sand core;

(H) Vibration cleaning process: The sand core inner mold in the primary embryo mold is broken and removed by vibration, forming a primary embryo furnace head with a hollow air chamber;

(I) Hole and groove processing: The top surface of the primary furnace head is processed by drilling, grooving or rolling technology so that the primary furnace head has flame holes;

(J) Flattening: The surface of the rough furnace head with flame holes is turned (milled) to make the surface of the rough furnace head more refined;

(K) Finished product: a copper furnace head with an air chamber and flame holes.

Although the above creation can achieve its creative purpose, it will produce the following deficiencies during the manufacturing process:

Since the upper and lower molds of the clay and sand are usually made by master-level personnel, especially how to evenly distribute several of the pads one by one at the predetermined position of the clay and sand lower mold for the first time? How to place the top plane of the sand core inner mold above the first pad so that the sand core inner mold can be evenly located in the predetermined position of the clay and sand lower mold? And how to evenly distribute several of the pads one by one at the bottom plane of the sand core inner mold for the second time? All of these need to be placed and produced by experienced masters. In this way, not only is their production capacity limited due to too many times of placement work, so that they cannot greatly increase their production, but also the wages of experienced masters are relatively high, which causes the unit price of their output to be high, and then the lack of market competitiveness is a major problem.

As mentioned above, in order to solve the problem of difficulty in hiring experienced masters, the industry often hires a large number of foreign workers to provide training. However, during the training process, the yield rate often declines significantly, and the production capacity is greatly reduced, which is another major problem.

As mentioned above, when the poured hot molten copper alloy liquid flows and touches the Styrofoam pad, the pad will be melted quickly, and the flowing hot molten copper alloy liquid will push the sand core inner mold to move at the predetermined position of the upper and lower molds of the soil and sand, so that the sand core inner mold will deviate and touch the inner wall surface of the predetermined position of the upper and lower molds of the soil and sand. In this way, the damage rate of the furnace head produced is greatly increased, and its production capacity is greatly reduced as another major problem.

Therefore, how to develop a technology that can reduce excessive reliance on master-level personnel, reduce costs, and improve yield, production capacity, and competitiveness is a technical issue that the industry currently needs to prioritize.

The main contents of the manufacturing method of the gas copper furnace head and the sand core inner mold used for the manufacturing thereof are to provide a method of using the side guide column with a protruding shape on the side wall surface of the base of the sand core inner mold and the positioning column with a groove and a protruding shape near the tube clamping section of the sand core inner mold, so that the side guide column, the clamping section and the positioning column are respectively accommodated in the fixed concave part of the metal lower mold, and after closing the metal upper and lower molds, the sand core inner mold can be suspended at the predetermined position of the metal upper and lower molds, and then undergo (A) material preparation processing; (B) spraying processing; (C) mold placement and closing processing; (D) pouring and pressurizing processing; (E) cooling sampling processing; (F) vibration cleaning processing; (G) filling After the following steps, a copper furnace head with an air chamber, a mixing tube and a flame hole can be completed. In this way, it can not only replace professional master-level personnel with non-professional personnel to greatly reduce the excessive dependence on master-level personnel and reduce their labor costs, but also reduce the bottleneck problem of hiring talents and technology in sunset industries, and enable young people or second-time employees to be willing to re-participate to revitalize or extend the life and value of the products. At the same time, it can also greatly improve production capacity and yield, thereby greatly improving its market competitiveness as its progressive proposition.

In order to achieve the above-mentioned purpose, the main technical means of the present invention and its manufacturing steps are as follows: (A) Material preparation and processing: Purchase or make a sand core inner mold of a predetermined shape and size required for a gas copper furnace head; the sand core inner mold at least includes a base for forming an air chamber of the copper furnace head and a tube for forming a mixing tube of the copper furnace head; wherein, a protruding side guide column is provided at the side wall surface of the base so that the side guide column can be placed in the fixed groove of the metal upper and lower molds; and, one end of the tube is connected to the base and the other end is formed with a clamping section for clamping the metal upper and lower molds, and a groove and a protruding positioning column are provided near the clamping section; (B) Spraying processing: After opening the metal upper and lower molds, the demoulding The agent is sprayed on the predetermined positions of the metal upper and lower molds; and the predetermined positions of the metal upper and lower molds are provided with fixed grooves so that one end of the side guide column of the sand core inner mold can be accommodated and limited in the fixed grooves; (C) Insertion and closing mold processing: After the side guide column of the sand core inner mold, the clamping section and the positioning column are respectively placed in the fixed grooves of the metal upper and lower molds and the other end of the predetermined position, the metal upper and lower molds are closed so that the clamping section, the positioning column and the side guide column of the sand core inner mold can be clamped by the metal upper and lower molds respectively to ensure that the sand core inner mold is fixed in the predetermined positions of the metal upper and lower molds in a suspended state at least three points; (D) Pouring and pressurizing processing: The molten copper alloy is poured into the mold. The molten copper alloy liquid is poured into the temporary storage cylinder of the machine, and then a thruster is used to pressurize and push the molten copper alloy liquid to flow, so that the copper alloy liquid first flows through the injection port of the metal upper mold, and then fills the predetermined positions of the metal upper and lower molds and the surrounding areas of the sand core inner mold; (E) Cooling sampling processing: when the molten copper alloy liquid is cooled to near room temperature, the metal upper and lower molds are opened to take out a primary embryo mold covered with the sand core inner mold 1; (F) Vibration cleaning processing: the sand core inner mold in the primary embryo mold is broken and taken out by vibration, and a primary embryo furnace head with a hollow air chamber, side guide holes and mixing tubes is formed; (G) Material replenishment processing: the copper material is welded to the primary embryo mold by welding technology. (H) Polishing: Polish the surface of the side guide holes and damaged parts of the primary furnace head to ensure that there are no holes on the outer surface of the primary furnace head and that there is no leakage in the hollow air chamber of the primary furnace head; (I) Hole and groove processing: Use drilling, grooving or rolling technology to process the top surface of the primary furnace head so that the primary furnace head is formed with multiple flame holes; (J) Flattening: Turn (mill) the surface of the primary furnace head with multiple flame holes to make the surface of the primary furnace head more refined; (K) Finished product: Complete a copper furnace head with an air chamber, a mixing tube and flame holes.

[Original work]

1: Sand core inner mold

10: Base

101: Side wall

102: Side guide column

103: Side guide column

11: Management Department

112: Clamping section

113: Slotting

114: Positioning column

2: Copper stove head

20: Air chamber

21: Mixing tube

22: Flame hole

40:Metal upper mold

402: Fixed groove

41:Metal lower mold

412: Fixed groove

(A): Material preparation and processing

(B):Spraying process

(C): Place in mold and process

(D): Pouring and pressurizing process

(E): Cooling sampling process

(F): Vibration cleaning process

(G):Material processing

(G-1): Tapping process

(G-2): Locking process

(H): Polishing process

(I): Hole and groove processing

(J): Flattening process

(K): Finished product

Figure 1 is a process flow chart of the gas copper furnace head manufacturing method of the present invention.

Figure 2 is a three-dimensional exploded schematic diagram of the sand core inner mold of the present invention.

Figure 3 is the A-A section of Figure 2 and a partial combined cross-section during application.

Figure 4 is a three-dimensional image of the finished product produced by the present invention.

Figure 5 is a processing flow chart of the second embodiment of the present invention.

The present invention relates to a method for manufacturing a copper gas furnace head and a sand core inner mold for use in the manufacturing thereof. Please refer to FIGS. 1 to 4. The manufacturing method of the copper gas furnace head is as follows: (A) Material preparation and processing: Purchase or make a sand core inner mold 1 of a predetermined shape and size required for the copper gas furnace head; the sand core inner mold 1 at least includes a base 10 for forming an air chamber 20 of the copper furnace head 2, and a tube 11 for forming a mixing tube 21 of the copper furnace head 2; wherein the base 10 has a The side wall surface 101 is provided with protruding side guide posts 102 and 103 so that the side guide posts 102 and 103 can be placed in the fixed grooves 402 and 412 of the metal upper and lower molds 40 and 41; in addition, one end of the tube 11 is connected to the base 10 and the other end is formed with a clamping section 112 for clamping the metal upper and lower molds 40 and 41, and a cut groove 113 and a protruding positioning post 114 are provided near the clamping section 112 (such as: Figure 2);

(B) Spraying process: After opening the metal upper and lower molds 40 and 41, the mold release agent is sprayed on the predetermined positions of the metal upper and lower molds 40 and 41; in addition, the predetermined positions of the metal upper and lower molds 40 and 41 are provided with fixed grooves 402 and 412 so that one end of the side guide column 102 and 103 of the sand core inner mold 1 can be accommodated and limited in the fixed grooves 402 and 412 (as shown in Figure 3);

(C) Insertion and mold closing processing: After the side guide columns 102, 103, the clamping section 112 and the positioning column 114 of the sand core inner mold 1 are respectively inserted into the fixed grooves 402, 412 of the metal upper and lower molds 40, 41 and the other end of the predetermined position, the metal upper and lower molds 40, 41 are closed so that the clamping section 112, the positioning column 114 and the side guide columns 102, 103 of the sand core inner mold 1 can be clamped by the metal upper and lower molds 40, 41 respectively, so as to ensure that the sand core inner mold 1 is fixed in a suspended state at least at three points at the predetermined position of the metal upper and lower molds 40, 41;

(D) Pouring and pressurizing process: Pour the molten copper alloy liquid into the temporary storage cylinder (not shown) of the machine (not shown in the figure), and then use a thruster (such as a hydraulic cylinder, a pneumatic cylinder, or a screw thruster, etc.) to pressurize and push the molten copper alloy liquid to flow, so that the copper alloy liquid first flows through the injection port (not shown in the figure) of the metal upper mold 40, and then fills the predetermined positions distributed in the metal upper and lower molds 40, 41 and the periphery of the sand core inner mold 1;

(E) Cooling and sampling: When the molten copper alloy liquid cools to near room temperature, the metal upper and lower molds 40 and 41 are opened to take out a primary embryo mold covered with the sand core inner mold 1;

(F) Vibration cleaning process: The sand core inner mold 1 in the primary embryo mold is broken and removed by vibration (machine or knocking), forming a primary embryo furnace head with a hollow air chamber 20, a side guide hole (not shown in the figure) and a mixing tube 21;

(G) Filling processing: Use welding technology to weld the copper material (not shown in the figure) to the side guide hole of the primary furnace head (including other damaged positions of the primary furnace head) to ensure that there are no holes on the outer surface of the primary furnace head and that the hollow air chamber 20 of the primary furnace head will not leak;

(I) Hole and groove processing: The top surface of the primary furnace head is processed by drilling, grooving or rolling technology so that the primary furnace head is formed with a plurality of flame holes 22;

(K) Finished product: a copper furnace head 2 having an air chamber 20, a mixing tube 21 and a flame hole 22 is completed (as shown in Figure 4).

Furthermore, in order to improve the quality of the preliminary furnace head produced by the present invention, a "(H) polishing process" step can be added after the above-mentioned "(G) material filling process" step, wherein (H) polishing process: the surface of the side guide hole and the damaged part of the preliminary furnace head that have been filled with material is polished to ensure that the outer surface of the preliminary furnace head is flat;

In addition, in order to improve the surface consistency of the primary furnace head, a "(J) flattening processing" step can be added after the above-mentioned "(I) hole groove processing" step, wherein (J) flattening processing is to perform a turning (milling) operation on the surface of the primary furnace head having a plurality of flame holes 22 to make the surface of the primary furnace head more refined.

Through the above steps, the present invention first uses a home-based manufacturing method or employs non-professional personnel (such as housewives, child workers, second-time employees, etc.) to place the sand core inner mold 1 at the predetermined position of the metal upper and lower molds 40, 41, so that the sand core inner mold 1 is suspended and fixed at the predetermined position of the metal upper and lower molds 40, 41, and then (A) material preparation processing; (B) spraying processing; (C) mold placement and closing processing; (D) pouring and pressurizing processing; (E) cooling and sampling processing; (F) vibration cleaning processing; (G) material replenishment processing; (H) polishing processing; (I) hole groove processing (J) flattening; (K) finished product, etc., before a copper furnace head 2 with an air chamber 20, a mixing tube 21 and a flame hole 22 can be completed. In this way, non-professional personnel are hired to replace professional master-level personnel, which greatly reduces the excessive dependence on master-level personnel and reduces their labor costs. It can also reduce the bottleneck problem of hiring talents and technology in sunset industries, and enable young people or second-time employees to be willing to re-participate to revitalize or extend the life and value of the product. At the same time, it can also greatly improve production capacity and yield, thereby greatly improving its market competitiveness.

Please refer to Figure 5, which is a flow chart of the second embodiment of the present invention. The main manufacturing steps are as follows: (A) material preparation; (B) spraying; (C) mold placement; (D) pouring and pressurizing; (E) cooling and sampling; (F) vibration cleaning; (G-1) tapping; (G-2) locking; (H) polishing; (I) hole and groove processing; (J) flattening; (K) finished product. There are two main changes to this embodiment: one is "(G- "(1) Tapping Process": tapping is performed directly at the side guide hole of the primary furnace head; the second is "(G-2) Locking Process": screwing the threaded section of the bolt with adhesive (not shown) into the side guide hole (not shown) to block the path of the side guide hole connecting the air chamber 20 to the outside thereof; further, in order to improve the quality of the primary furnace head produced by the present invention, after the above-mentioned "(F) Vibration Cleaning Process" step, or after the "(G-1) Tapping Process" step, or after the "(G-2) After the "locking process" step, a "(G) material filling process" step is added. The "material filling process" is to weld a copper material piece (not shown in the figure) to the damaged position of the blank furnace head by welding technology to ensure that there are no holes on the outer surface of the blank furnace head and that there is no leakage in the hollow air chamber 20 of the blank furnace head. In addition, after the "(G) material filling process" step, a "(H) polishing process" step is added. The "polishing process" is to fill the damaged position of the blank furnace head and lock it to the side guide. The bolts at the holes are polished to ensure that the outer surface of the blank furnace head is flat; the above-mentioned (A) material preparation processing, (B) spray coating processing, (C) mold placement processing, (D) pouring and pressurizing processing, (E) cooling sampling processing, (F) vibration cleaning processing, (I) hole and groove processing, (J) flattening processing, and (K) finished product are equivalent to the contents of the above-mentioned paragraphs [0023] to [0028], [0030], [0031], and [0033], so they are not repeated here.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention; therefore, all equivalent changes or modifications based on the features and spirit described in the scope of the present invention should be included in the scope of the patent application of the present invention.

(A): Material preparation and processing

(B):Spraying process

(C): Place in mold and process

(D): Pouring and pressurizing process

(E): Cooling sampling process

(F): Vibration cleaning process

(G):Material processing

(H): Polishing process

(I): Hole and groove processing

(J): Flattening process

(K): Finished product

Claims (10)

A method for manufacturing a gas copper furnace head, the manufacturing steps of which at least include: (A) Material preparation and processing: Purchase or make a sand core inner mold of a predetermined shape and size; the sand core inner mold includes at least a base for forming an air chamber and a tube for forming a mixing tube, and a protruding side guide column is formed around the side of the base. One end of the tube is connected to the base and the other end is formed with a clamping section for clamping the metal upper and lower molds; (B) Spraying process: After opening the metal upper and lower molds, spray the release agent on the predetermined positions of the metal upper and lower molds; (C) Placement and mold closing processing: After placing the sand core inner mold in the predetermined position of the metal upper and lower molds, the metal upper and lower molds are closed so that the clamping part of the sand core inner mold is clamped by the metal upper and lower molds to ensure that the sand core inner mold is suspended and fixed at the predetermined position of the metal upper and lower molds; (D) Pouring and pressurizing process: Pour the molten copper alloy liquid into the temporary storage cylinder of the machine, and then use the pressurized pushing action to fill the copper alloy liquid into the predetermined positions of the metal upper and lower molds and the surrounding areas of the sand core inner mold; (E) Cooling sampling process: When the molten copper alloy liquid cools to near room temperature, the upper and lower metal molds are opened to take out a primary embryo mold covered with the sand core inner mold; (F) Vibration cleaning process: The sand core inner mold in the primary embryo mold is broken and removed by vibration, forming a primary embryo furnace head with a hollow air chamber and side guide holes; (G) Filling processing: Use welding technology to weld copper parts to the side guide holes and damaged parts of the primary furnace head to ensure that there are no holes on the outer surface of the primary furnace head; (I) Hole and groove processing: The top surface of the primary furnace head is processed by drilling, grooving or rolling technology to form flame holes on the primary furnace head; (K) Finished product: a copper furnace head with an air chamber, a mixing tube and a flame hole; Through the above steps, the present invention utilizes non-professional personnel to place the sand core inner mold in the predetermined position of the metal upper and lower molds, so that the sand core inner mold is suspended and fixed in the predetermined position of the metal upper and lower molds. In this way, non-professional personnel are employed to replace professional master-level personnel, which greatly reduces excessive dependence on master-level personnel and reduces their labor costs. It can also reduce the technical bottleneck of the sunset industry, and allow new personnel to be re-injected to activate or extend the life of the product. At the same time, it can also greatly improve production capacity and yield, thereby greatly improving its market competitiveness. As described in the first item of the patent application scope, in the method for manufacturing a gas copper furnace head, the "(I) hole groove processing" step may be followed by the "(J) flattening processing" step; and the flattening processing is to perform a turning (milling) operation on the surface of the rough furnace head that already has a flame hole to make the surface of the rough furnace head more refined. For example, in the method for manufacturing a gas copper furnace head as described in item 1 or 2 of the patent application, a "(H) polishing process" step is added after the "(G) material filling process" step; and the polishing process is to polish the surface of the damaged part of the initial furnace head with the material filled to ensure that the outer surface of the initial furnace head is flat. A method for manufacturing a gas copper furnace head, the manufacturing steps of which at least include: (A) Material preparation and processing: Purchase or make a sand core inner mold of a predetermined shape and size; the sand core inner mold includes at least a base for forming an air chamber and a tube for forming a mixing tube, and a protruding side guide column is formed around the side of the base. One end of the tube is connected to the base and the other end is formed with a clamping section for clamping the metal upper and lower molds; (B) Spraying process: After opening the metal upper and lower molds, spray the release agent on the predetermined positions of the metal upper and lower molds; (C) Placement and mold closing processing: After placing the sand core inner mold in the predetermined position of the metal upper and lower molds, the metal upper and lower molds are closed so that the clamping part of the sand core inner mold is clamped by the metal upper and lower molds to ensure that the sand core inner mold is suspended and fixed at the predetermined position of the metal upper and lower molds; (D) Pouring and pressurizing process: Pour the molten copper alloy liquid into the temporary storage cylinder of the machine, and then use the pressurized pushing action to fill the copper alloy liquid into the predetermined positions of the metal upper and lower molds and the surrounding areas of the sand core inner mold; (E) Cooling sampling process: When the molten copper alloy liquid cools to near room temperature, the upper and lower metal molds are opened to take out a primary embryo mold covered with the sand core inner mold and having side guide holes; (F) Vibration cleaning process: The sand core inner mold in the primary embryo mold is broken and removed by vibration, forming a primary embryo furnace head with a hollow air chamber and side guide holes; (G-1) Tapping process: tapping is performed on the side guide hole of the primary furnace head; (G-2) Locking process: Screw the threaded section of the bolt coated with adhesive into the side guide hole to block the path connecting the side guide hole to the air chamber to the outside; (I) Hole and groove processing: The top surface of the primary furnace head is processed by drilling, grooving or rolling technology so that the primary furnace head has flame holes; (K) Finished product: a copper furnace head with an air chamber, a mixing tube and a flame hole. Through the above steps, the present invention utilizes non-professional personnel to place the sand core inner mold in the predetermined position of the metal upper and lower molds, so that the sand core inner mold is suspended and fixed in the predetermined position of the metal upper and lower molds. In this way, non-professional personnel are employed to replace professional master-level personnel, which greatly reduces excessive dependence on master-level personnel and reduces their labor costs. It can also reduce the technical bottleneck of the sunset industry, and allow new personnel to be re-injected to activate or extend the life of the product. At the same time, it can also greatly improve production capacity and yield, thereby greatly improving its market competitiveness. As described in item 4 of the patent application scope, in the method for manufacturing a gas copper furnace head, the "(I) hole groove processing" step may be followed by a "(J) flattening processing" step, wherein the flattening processing is to perform a turning (milling) operation on the surface of the rough furnace head having flame holes to make the surface of the rough furnace head more refined. For example, in the method for manufacturing a gas copper furnace head as described in item 4 or 5 of the patent application, after the "(F) vibration cleaning process" step, or after the "(G-1) tapping process" step, or after the "(G-2) locking process" step, there is an additional "(G) filling process" step; and the filling process is to weld the copper material to the damaged part of the rough furnace head by welding technology to ensure that there are no holes on the outer surface of the rough furnace head. As described in item 6 of the patent application scope, in the manufacturing method of a gas copper furnace head, a "(H) polishing process" step is added after the "(G) material filling process" step; and the polishing process is to polish the surface of the damaged position of the primary furnace head and the bolts locked in the side guide hole, so as to ensure that the outer surface of the primary furnace head is flat. A sand core inner mold for use in manufacturing gas copper furnace heads, wherein: The sand core inner mold at least includes a base for forming the air chamber of the copper furnace head and a tube for forming the mixing tube of the copper furnace head; the base is formed with side guide columns around its side; one end of the tube is connected to the base and the other end is formed with a clamping section, and a protruding positioning column is provided at the clamping section; Through the above structure, the side guide column, the positioning column and the clamping section of the sand core inner mold are simultaneously clamped by the mold, so that the sand core inner mold is suspended and fixed at the predetermined position of the mold. For example, the sand core inner mold for manufacturing gas copper furnace heads as described in Item 8 of the patent application scope, wherein the mold refers to a metal upper and lower mold that can be opened or closed separately, and the metal upper and lower molds are respectively provided with fixed grooves so that the side guide columns of the sand core inner mold can be placed in the fixed grooves; and when the metal upper and lower molds are closed, the side guide columns, clamping sections and positioning columns of the sand core inner mold can be clamped and limited between the metal upper and lower molds. As described in Item 9 of the patent application, a sand core inner mold for manufacturing a gas copper furnace head, wherein a slot is provided near the clamping section of the sand core inner mold.

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