TW201531349A - Vacuum gravity casting method for manufacturing golf iron heads - Google Patents

Abstract

A vacuum gravity casting method for manufacturing golf iron heads is presented to solve problems of atmospheric gravity casting method. The vacuum gravity casting method comprises: positioning a shell mold in a vacuum furnace, with the shell mold has a crucible portion and a casting portion communicated with each other, with the vacuum furnace connects to a rotation axis; putting a solid metal ingot into the crucible portion of the shell mold, and melting the metal ingot in a vacuum environment; driving the rotation axis to linking-up the vacuum furnace dumps laterally, and make metal liquid flow into a mold cavity inside the casting portion; destroying the shell mold then get a casting product with a casting member portion; separating the casting member portion from the casting product, then get a plurality of golf iron head casting member.

Description

Method for vacuum casting a golf iron head by vacuum gravity

The present invention relates to a method of casting a golf club head, and more particularly to a method of vacuum gravity casting a golf club iron head.

Generally speaking, golf clubs can be divided into three categories: wood poles, irons and putters. Currently, the materials used in iron heads are mostly stainless steel or carbon steel. The forming method of golf iron heads is mainly The precision casting process of atmospheric gravity casting is the main method.

More specifically, please refer to FIG. 1 for forming a wax blank 9 of a shell mold required for performing an atmospheric gravity casting method, the wax blank 9 comprising a gate cup 91, the gate cup 91 A runner 92 is connected to the lower side of the runner 92, and a plurality of gate embryos 93 are connected below the runner 92, and a casting embryo 94 is connected to the underside of each gate 93, and the shape of each of the castings 94 is substantially Corresponding to the golf iron head to be formed; thereby, the wax blank 9 can form a shell mold, and the shell mold has a gate cup portion, a runner portion, an inlet portion and a gate portion arranged from top to bottom. Casting section.

The atmospheric gravity casting method described above is carried out in the atmosphere, and the melting of the cast material is rapidly performed by a melting furnace such as a High Frequency Induction Furnace, and a refining step such as slagging and degassing is performed to remove impurities in the molten metal. Slag and gas, and then the operator carries the preheated high temperature shell mold to the furnace for melting the molten metal with a long crucible, and the gate of the shell mold from the furnace The cup is poured into the molten metal, so that the molten metal flows downward by gravity to fill each of the casting portions to form a plurality of golf iron head castings at one time; however, the casting method has the following disadvantages:

(1) Since the cast material which can improve the functionality of the iron head often contains active metals (for example, manganese, aluminum, bismuth, cobalt, titanium, etc.), when the cast material is smelted in the atmosphere, the active metal in the cast material will be produced. The violent oxidation reaction not only causes the difficulty of smelting the cast material, but also easily reacts with the atmosphere to cause oxidative cracking during subsequent casting, resulting in appearance defects such as sesame spots and black beans on the golf iron head casting after casting. Even the reaction gas forms a large number of casting defects such as slag holes or reaction pores on the golf iron head casting; in addition, the severe oxidation reaction also causes the fluidity of the molten metal in the shell mold to decrease, thereby causing insufficient casting. The molding yield of the golf iron head casting is lowered, or the problem of cold lock is generated, and a gap is formed in the golf iron head casting, which affects the tensile strength of the golf iron head casting.

(2) Since the smelting of the cast material is carried out by means of batching, the amount of various alloying elements is calculated according to the alloy to be produced to reasonably match the raw materials, but the reactivity of various alloying elements with oxygen or nitrogen in the atmosphere is different. It is necessary to adjust the order and time of addition for each alloying element of the casting material, so that the difficulty of operation is improved. In addition, if the casting material contains an alloying element having a low melting point (for example, aluminum, manganese, bismuth, etc.), it is easy to cause splashing during the process of melting the molten metal, causing danger to the operator and loss of the cast material.

(3) Before casting, it is necessary to carry out a degassing step, using deoxidizer to deoxidize the molten metal, and the effect of deoxidation will directly affect the properties of the alloy. When the deoxidation is insufficient, the golf iron head casting will have pinholes and excessive deoxidation. Non-metallic impurities may be generated in the golf iron head casting.

(4) Before using the manpower to carry the shell mold to the molten metal, if the operator Insufficient arm force, or the angle of the pouring cup of the shell mold is not aligned with the pouring angle of the furnace. Improper operation of various casting operations may cause the molten metal to overflow or splash from the pouring cup portion, which also causes operation. The danger of personnel and the loss of cast materials.

(5) During the process of transporting the shell mold to the furnace, the shell mold will have a certain degree of temperature drop due to leaving the preheating environment, thus affecting the line and quality of the golf iron head casting; if the shell mold is to be cast When there is a certain high temperature, it is necessary to increase the temperature of the preheating shell mold, which increases the casting cost relative to the problem of high energy consumption.

For the above reasons, there is a need to improve the method of casting a golf iron head.

The object of the present invention is to provide a method for vacuum casting a golf club iron head, which can reduce the chance of chemical reaction between the casting material and the atmosphere during the whole casting process, so that the casting material can be uniformly melted and the molten metal is raised in the shell. The fluidity in the mold to improve the molding yield and quality of the casting.

A second object of the present invention is to provide a vacuum gravity casting method for a golf club iron head, which can reduce the chance of chemical reaction between the casting material and the atmosphere during smelting, to simplify the batching step of the casting material, improve the operation convenience and avoid metal. Liquid splashing.

Another object of the present invention is to provide a vacuum gravity casting method for forming a golf iron head, which can eliminate the steps of slagging and degassing the molten metal, thereby simplifying the process and reducing the casting cost, and avoiding the influence of the deoxidation effect on the alloy property. .

Still another object of the present invention is to provide a method of vacuum gravity casting a golf club iron head that ensures accurate casting action and avoids spillage or splashing of molten metal.

A further object of the present invention is to provide a vacuum gravity casting method for forming a golf club iron head, which can prevent the shell mold from generating a temperature drop before casting, thereby reducing the temperature of the preheating shell mold, and helping to reduce energy consumption to save casting. cost.

In order to achieve the foregoing object, the technical content of the present invention includes: a method for vacuum-casting a golf iron head, comprising: positioning a shell mold in a vacuum furnace, the shell mold having a crotch portion and a casting member And a connecting portion that communicates with the inside of the crotch portion and the casting portion, the inside of the casting portion has a forming cavity, the vacuum furnace is connected to a rotating shaft, and the casting portion of the shell mold is adjacent to the rotating shaft Depositing at least one metal ingot on the crotch portion of the shell mold, and melting the metal ingot into a molten metal under a vacuum environment; driving the rotating shaft to laterally dump the vacuum furnace, causing the molten metal to flow into and fill by gravity Forming a cavity of the casting portion; after the molten metal is completely solidified, the shell mold is broken to obtain a casting, the casting includes a casting portion; the casting portion is separated from the casting to obtain a plurality of golf balls Ball iron head castings.

Wherein, the number of the metal ingots may be a single one, and the composition combination of the metal ingots is consistent with the composition combination of the golf iron head castings to be cast. Alternatively, the number of the metal ingots may be several, and the composition of the molten metal after melting of the plurality of ingots is consistent with the composition of the components of the golf iron head casting to be cast.

Wherein, after the metal ingot is placed in the crotch portion of the shell mold, a lid can be covered at the opening of the crotch portion.

Wherein, the rotating shaft rotates about 45-135 degrees to interlock the vacuum furnace to tilt sideways, and the rotating shaft interlocks the vacuum furnace from the initial state to the side of the initial state to "flow the molten metal from the connecting portion into the casting in a direction perpendicular to the ground. The time spent in the state is less than 2 seconds.

Wherein, the rotating shaft tilts the vacuum furnace laterally until the molten metal flows into the casting portion from the connecting portion in a direction perpendicular to the ground.

Wherein, after the shell mold is placed in the vacuum furnace, the casting part of the shell mold is carried by a loading platform, and the connecting portion of the shell mold is abutted by a supporting member, so that the crotch portion of the shell mold can be maintained. Extends inside the heater. Also, the heater can be a high frequency coil.

The molding step of the shell mold comprises: preparing a wax embryo, the wax embryo comprising a embryo, a plurality of casting embryos, and a connecting embryo, one end of the connecting embryo is connected to the circumferential surface of the embryo, and each casting An embryo is attached to the other end of the connecting embryo; a coating layer is formed on the surface of the wax embryo; the wax embryo and the coating layer are heated to melt the wax; and the dewaxed coating layer is sintered at a high temperature The shell mold is formed, and the crotch portion, the joint portion, and the casting portion of the shell mold are integrally connected.

The embryo of the wax embryo has a cylindrical shape, and the embryo has an upper end surface and a lower end surface. A circumferential surface is connected between the upper end surface and the lower end surface, and a diameter of the circumferential surface of the ring surface faces from the lower end surface. The upper end surface is gradually expanded, so that the circumferential surface of the ring is inclined and forms a draft angle with the axial direction of the embryo, and the draft angle is 3 to 15 degrees.

Alternatively, the embryo of the wax embryo has a cylindrical shape, and the embryo has an upper end surface and a lower end surface, and a circumferential surface is connected between the upper end surface and the lower end surface, and the embryo has another inclined surface, and the inclined surface is connected. Between the lower end surface of the embryo and the connecting embryo, the inclined surface forms an oblique angle with the axial direction of the embryo, and the inclination angle is 3 to 15 degrees.

Accordingly, the vacuum gravity casting golf iron head of the present invention can reduce the chance of chemical reaction with the atmosphere during the entire casting process by the vacuum environment, regardless of whether the casting material contains active metal or the casting material. They are easily smelted uniformly and enhance the fluidity of the molten metal in the shell mold to improve the molding yield and quality of the casting; in addition, when smelting the cast material It can simplify the batching steps of casting materials, improve the convenience of operation and avoid splashing of molten metal; it can also eliminate the steps of slagging and degassing the molten metal to simplify the process and reduce the casting cost, and avoid the influence of deoxidation effect on the properties of the alloy. . Furthermore, the method of vacuum gravity casting of a golf iron head of the present invention can ensure that the casting action is performed accurately, avoiding metal liquid overflow or splashing; and avoiding the temperature drop of the shell mold before casting, so that the preheating shell mold is The temperature is reduced, which helps to reduce energy consumption and save on casting costs.

〔this invention〕

1‧‧‧vacuum furnace

11‧‧ ‧ room

12‧‧‧ Airway tube

13‧‧‧ openings

14‧‧‧ Cover

15‧‧‧Shaft connection

2‧‧‧ shaft

3‧‧‧ stage

31‧‧‧ 承座

311‧‧‧Auxiliary positioning parts

32‧‧‧Adjustment

4‧‧‧heating module

41‧‧‧heater

42‧‧‧Adjustment

43‧‧‧heat transfer cup

5‧‧‧Support

51‧‧‧Abutment locating parts

52‧‧‧Adjustment

6‧‧‧Shell mold

61‧‧‧坩埚

611‧‧‧ accommodating space

62‧‧‧ casting department

621‧‧‧Forming cavity

63‧‧‧Connecting Department

7‧‧‧Wax embryo

71‧‧‧坩埚 embryo

72‧‧‧ casting embryo

73‧‧‧Connected embryo

8‧‧‧Cladding

A‧‧‧ axis

C‧‧‧ cover

M‧‧ motor

N‧‧‧metal liquid

P‧‧‧metal ingots

Θ‧‧‧ draft angle

‧‧‧‧Tilt angle

[Use]

9‧‧‧Wax embryo

91‧‧‧Gour cup mug

92‧‧‧Flow Embryo

93‧‧‧Into the gate embryo

94‧‧‧ casting embryo

Fig. 1 is a schematic view showing the structure of a wax embryo used for molding a shell mold required for atmospheric gravity casting.

Fig. 2 is a side sectional view showing the vacuum casting apparatus used in the present invention.

Fig. 3 is a schematic view showing the molding process of the shell mold of the present invention.

Fig. 4 is a perspective view showing an embryo of the invention for forming a shell mold.

Fig. 5 is a side cross-sectional view showing the embryo of Fig. 4.

Fig. 6 is a perspective view showing another embryo of the invention for forming a shell mold.

Figure 7: A side cross-sectional view of the embryo of Figure 6.

Figure 8 is a schematic view showing the implementation of the present invention before the metal ingot is smelted.

Fig. 9 is a schematic view showing the implementation of the present invention in the case of melting a metal ingot into a molten metal.

Fig. 10 is a schematic view showing the implementation of the present invention in which the vacuum furnace is poured sideways to allow the molten metal to flow in and fill the forming cavity.

The above and other objects, features and advantages of the present invention will become more <RTIgt; The vacuum gravity casting method of the golf iron head of the present invention is used in combination with a vacuum casting apparatus. The vacuum casting device comprises a vacuum furnace 1, a rotating shaft 2, a loading platform 3, a heating module 4 and a supporting member 5; the loading platform 3, the heating module 4 and the supporting member 5 are partially disposed on In the vacuum furnace 1, a shell mold 6 is placed for positioning, and the vacuum furnace 1 is connected to the rotating shaft 2 to be driven by the rotating shaft 2 to be reversed.

More specifically, the inside of the vacuum furnace 1 has a chamber 11 , and the vacuum furnace 1 can be provided with an air duct 12 , the air tube 12 is connected to the chamber 11 , and a vacuum controller (not shown) The chamber 11 can be evacuated through the air duct 12 according to a set value to control the degree of vacuum of the chamber 11. The vacuum furnace 1 is further provided with an opening 13 and a cover 14 through which the user can insert or remove articles into the chamber 11, and the cover 14 can control the opening and closing of the opening 13.

In addition, a rotating shaft connecting portion 15 is disposed on one outer surface of the vacuum furnace 1 so that the vacuum furnace 1 can be connected to the rotating shaft 2 by the rotating shaft connecting portion 15 to drive the vacuum furnace 1 to rotate a preset angle by the rotating shaft 2. In the embodiment shown in FIG. 2, the rotating shaft 2 can be selectively connected to the output end of a motor M to be driven to rotate by the motor M, and the motor M is preferably a motor capable of being reversed and reversed, After the vacuum furnace 1 is turned over by a predetermined angle, it can be reversed to invert the vacuum furnace 1 back to the initial position.

The carrier 3 includes a socket 31 and an adjusting member 32 for carrying and positioning a part of the shell mold 6. The socket 31 is disposed in the chamber 11 of the vacuum furnace 1. And at a position closer to the rotating shaft 2 than the heating module 4, the top of the bearing 31 is preferably provided with an auxiliary positioning member 311 adjacent to the rotating shaft 2 to assist in lifting and positioning the shell mold 6; One end of the adjusting member 32 is connected to the bottom of the socket 31, and the other end passes through the vacuum furnace 1 to adjust the height of the socket 31 in the chamber 11.

The heating module 4 includes a heater 41 and an adjusting member 42. The heater 41 can be selected as a high-frequency coil to form a casting material melting zone for the inner circumference of the heater 41 for receiving and heating. Another part of the shell mold 6; the heater 41 is connected to one end of the adjusting member 42 to be held by the adjusting member 42 in the chamber 11 of the vacuum furnace 1, and the other end of the adjusting member 42 is passed through the vacuum furnace. 1, to adjust the position of the heater 41 in the chamber 11. Preferably, the heating module 4 further comprises a heat transfer cup 43 disposed in the casting material melting zone inside the heater 41 to prevent the heater 41 from directly touching the shell mold 6.

The supporting member 5 is disposed between the loading table 3 and the heating module 4, and the supporting member 5 includes an abutting positioning member 51 and an adjusting member 52. The abutting positioning member 51 is disposed in the capacity of the vacuum furnace 1. In the chamber 11, the shell mold 6 is positioned to abut; one end of the adjusting member 52 is connected to the bottom of the abutting positioning member 51, and the other end is passed out of the vacuum furnace 1 to adjust the abutting positioning member 51. The height in the chamber 11.

The shell mold 6 has a sill portion 61, a casting portion 62 and a connecting portion 63. The sill portion 61 can be substantially cup-shaped to form an accommodating space 611 therein, and the accommodating space 611 can be used for smelting. Casting material. The casting portion 62 is a portion for molding a golf iron head. The shape of the casting portion 62 is not particularly limited, and the inside of the casting portion 62 has a forming cavity 621 for molding a plurality of golf balls after each casting. Iron head castings. The connecting portion 63 is tubular, and one end of the connecting portion 63 is connected to the circumferential surface of the flange portion 61 and communicates with the receiving space 611. The other end of the connecting portion 63 is connected to the casting portion 62 and communicates with the forming cavity 621, so that the accommodating space 611 of the dam portion 61 is in communication with the forming cavity 621 of the casting portion 62. After the shell mold 6 is placed in the chamber 11 of the vacuum furnace 1, the jaw portion 61 can be placed in the heat transfer cup 43 of the heating module 4, and the casting portion 62 can be positioned and placed on the stage. The holder 31 of the third portion is such that the casting portion 62 is closer to the rotating shaft 2 than the crotch portion 61; the connecting portion 63 of the shell mold 6 is abutted by the abutting positioning member 51 of the supporting member 5.

Referring to FIG. 3, in the present embodiment, the crotch portion 61, the connecting portion 63 and the casting portion 62 of the shell mold 6 may be integrally connected. The shell mold 6 is formed by preparing a wax blank 7. The wax embryo 7 comprises a embryo 71, a plurality of casting embryos 72 and a connecting embryo 73. The embryo 71 and the connecting embryo 73 are solid wax blocks, and one end of the connecting embryo 73 is connected to the circumference of the embryo 71. Each of the casting blanks 72 is attached to the other end of the connecting embryo 73, and each of the casting blanks 72 is a portion for molding each of the golf iron head castings.

It is worth mentioning that each of the casting blanks 72 can be connected to the connecting embryo 73 at any position (ie, using any part as a casting port, such as a toe, a bottom, a heel, a back, a handle or a batting panel, etc. Whereas, the portion of each of the casting blanks 72 that connects the connecting embryos 73 may be more than one, and the corresponding changes may be made according to the "flow path design capable of improving the molding yield of the castings", which is Usually the knowledge person can understand.

Next, the wax blank 7 is subjected to a process such as dipping, sanding or grit, and a coating layer 8 is formed on the surface of the wax blank 7. The wax embryo 7 and the coating layer 8 are heated to melt the wax; for example, the wax blank 7 and the coating layer 8 may be placed together in a steam autoclave to melt the wax embryo 7 to The coating layer 8 is discharged. The dewaxed coating layer 8 is sintered at a high temperature (the firing condition can be, for example, 950 ° C for 30 minutes) to form the shell mold 6, and the crotch portion 61, the joint portion 63, and the casting of the shell mold 6 are formed. The sections 62 are integrally connected. Wherein, the surface layer material of the shell mold 6 may be selected from refractory materials such as zirconium silicate, cerium oxide, diazepam or alumina, and the back layer of the shell mold 6 may be made of mullite (3Al ₂ O ₃ -2SiO). ₂ ) or cerium oxide as a refractory material; further, when the back layer material is a mixture of mullite, the content of the aluminum oxide is preferably 45% to 60%, and the content of cerium oxide is preferably 55%. 40%; when the back layer material is a mixture of cerium oxide, the content of cerium oxide is preferably more than 95%.

Further, in order to improve the smoothness of the molten metal flowing into the casting portion 62 from the crotch portion 61 of the shell mold 6 during casting, the crotch portion 61 of the shell mold 6 preferably has an inclined circumferential wall which gradually expands the inner diameter from the bottom portion. Therefore, the embryo 71 of the wax embryo 7 needs to have a corresponding appearance. For example, referring to FIGS. 4 and 5, in an embodiment, the embryo 71 of the wax blank 7 may have a substantially cylindrical shape, and the embryo 71 has an opposite upper end surface 71a and a lower end surface 71b. A circumferential surface 71c is formed between the end surface 71a and the lower end surface 71b. The diameter of the circumferential surface 71c is gradually expanded from the lower end surface 71b toward the upper end surface 71a, so that the circumferential surface 71c of the blank 71 is inclined and The axis A of the embryo 71 forms a draft angle θ, which is about 3 to 15 degrees. Alternatively, please refer to FIGS. 6 and 7. In another embodiment, the embryo 71' of the wax embryo 7' may be substantially cylindrical, and the embryo 71' is provided with a slope 711, and the slope 711 is connected to the crucible. Between the lower end surface 71b' of the embryo 71' and the connecting embryo 73, the slope 711 forms an oblique angle α with the axis A of the embryo 71', and the inclination angle α is about 3 to 15 degrees.

According to the vacuum casting apparatus described above, the present invention can implement a vacuum gravity casting method for a golf iron head. The manufacturing method generally comprises the following steps: Referring to FIG. 8, a shell mold 6 is positioned and placed in a vacuum furnace. 1 in. More specifically, the shell mold 6 has a crotch portion 61, a casting portion 62 and a connecting portion 63, the connecting portion The two ends of the 63 are respectively connected to the dam portion 61 and the casting portion 62 such that the accommodating space 611 of the dam portion 61 is in communication with the forming cavity 621 of the casting portion 62; the shell mold 6 is placed in the vacuum furnace 1 The casting portion 62 of the shell mold 6 is carried by the socket 31 of the stage 3 and is stably fixed. The connecting portion 63 of the shell mold 6 is abutted by the abutting positioning member 51 of the supporting member 5, so that the The crotch portion 61 of the shell mold 6 is maintained to extend inside the heater 41 of the heating module 4.

And at least one metal ingot P is placed in the accommodating space 611 of the crotch portion 61 of the shell mold 6, and a cover C is preferably covered at the opening of the crotch portion 61 to prevent subsequent pouring of the molten metal. A situation in which molten metal overflows. Wherein, when the number of the metal ingots P is selected to be a single one, the composition combination of the metal ingot P is consistent with the composition of the components of the golf iron head casting to be made; when the number of the metal ingots P is several, The composition of the molten metal after the smelting of the plurality of metal ingots P is consistent with the composition of the components of the golf iron head casting to be produced. For example, the following table shows the nine alloy materials in which the manufacturing method of the present invention can be carried out, but is not limited thereto.

As can be seen from the above table, the first embodiment and the second embodiment are iron-based materials containing aluminum (Al) or bismuth (Si) or manganese (Mn) having an iron content of more than 50% and a density of 6.8 g/cm. ³ , tensile strength is 145 ~ 155ksi, belonging to steel with low specific gravity (density of 6.5 ~ 7.8g / cm ³ ) characteristics; 〝 three examples, 〝 four examples, 〝 five 〞 and 〝 Embodiment 6 is an iron-based material containing cobalt (Co) or molybdenum (Mo) or titanium (Ti), which has an iron content of more than 50%, a density of 7.8 g/cm ³ , and a tensile strength of 250 to 350 ksi. High-strength (tensile strength greater than 250ksi) steel-based materials; 〝Example 7 〞 is a high chromium (Cr) content of iron-based materials, containing 15 to 30% by weight of chromium, density of 7.5 ~ 8g /cm ³ , tensile strength is 90~110ksi; 〝Example 〞 and 〝Example 〞 〞 belongs to titanium alloy material, which contains 85%~95% titanium by weight, density is 4.2~4.6g/cm ³ , tensile strength is 100~150ksi.

Referring to Figure 9, the ingot P is smelted into a molten metal N in a vacuum environment. More specifically, after the shell mold 6 is placed and positioned, the crotch portion 61 of the shell mold 6 can be maintained in the casting material melting zone extending inside the heater 41 of the heating module 4; meanwhile, the vacuum furnace 1 Air tube 12 can evacuate the chamber 11 to control the degree of vacuum of the chamber 11. After the vacuum degree reaches a preset value (for example, the degree of vacuum is less than 0.3 mbar), the heater 41 can be activated to heat the crotch portion 61 of the shell mold 6 to melt the ingot P in the crotch portion 61 into The metal liquid N; wherein, when the heater 41 is actuated, the frequency of the power supply can be, for example, 4 to 30 kHz, and the power is 5 to 100 kW; the heater 41 can be stopped after the metal ingot P is smelted into the molten metal N. .

Referring to FIG. 10, the rotary shaft 2 is driven to laterally pour the vacuum furnace 1 so that the molten metal N flows by gravity and fills the molding cavity 621 of the casting portion 62. More specifically, the rotating shaft 2 can be driven by the motor M to rotate a preset angle to interlock the vacuum furnace 1 to rotate synchronously, and during the rotation, the molten metal N is subjected to gravity along the shell mold 6. The inner wall surface of the dam portion 61 flows into the molding cavity 621 of the casting portion 62 through the connecting portion 63 to perform the casting operation, and the molding cavity 621 is filled with the molten metal N. Wherein, the rotating shaft 2 is rotated by about 45 to 135 degrees to interlock the vacuum furnace 1 to be tilted laterally, and the rotation angle can be adjusted according to the angle of the molten metal N flowing from the flange portion 61 into the connecting portion 63, and particularly It is preferable that the molten metal N flows into the casting portion 62 from the connecting portion 63 in a direction perpendicular to the ground. Further, the rotating shaft 2 interlocks the vacuum furnace from the initial state to the side to "make the molten metal N perpendicular to The direction in which the ground direction flows from the connecting portion 63 into the casting portion 62" is defined as "dumping time", which preferably does not exceed 2 seconds.

After the molten metal N is completely solidified, the shell mold 6 is broken to obtain a cast. Wherein, after the casting is completed, the shell mold 6 is taken out from the vacuum furnace 1, and the shell mold 6 is left to stand until the molten metal N is completely solidified to destroy the shell mold 6; thus, in the shell mold 6 During the cooling process, the rotating shaft 2 can be reversed to interlock the vacuum furnace to return to the initial position to synchronously perform the casting operation of the other shell mold 6, which helps to improve the manufacturing efficiency. Alternatively, the shell mold 6 may be continuously cooled in the vacuum furnace 1 until the molten metal N in the shell mold 6 is completely solidified, and then the shell mold 6 is taken out from the vacuum furnace 1 and destroyed. Thereby, the molten metal N in the forming cavity 621 can be uniformly cooled from the outside to the inside.

Further, the cast refers to all the objects obtained after the shell mold 6 is broken, and generally includes a plurality of casting portions (about the casting embryo 72 corresponding to the wax blank 7) and a portion solidified by the flow passage (corresponding to a connecting embryo 73) of the wax blank 7, and each of the casting portions is integrally connected to the portion solidified by the flow passage; and the plurality of casting portions are continuously separated from the casting (for example, cutting with a cutter, Or use vibration to break it to get a few golf iron head castings.

In summary, the vacuum gravity casting method of the golf iron head of the present invention can be cast in a near vacuum environment to reduce the chance of chemical reaction between the casting material and the atmosphere throughout the casting process, regardless of the casting material. Whether or not the active metal is contained, the cast material (that is, the metal ingot) can be smelted smoothly and uniformly, thereby preventing the molten metal from reacting with the air to generate oxidative cracking during the process of flowing from the crotch portion of the shell mold into the casting portion. In the case, casting cast iron head castings will not easily appear appearance defects such as sesame spots or black beans, and it is not easy to produce casting defects such as slag holes or reaction pores formed by reaction gases, which will help improve the resistance of golf iron head castings. Pull strength and quality. On the other hand, reducing the chemical reaction between the molten metal and the atmosphere can also improve the fluidity of the molten metal in the shell mold, so that after the molten metal flows into the casting portion of the shell mold, the casting portion can be sufficiently filled to raise the golf iron. The molding yield of the head casting and the chance of forming a gap in the golf iron head casting by reducing the cold separation help to improve the tensile strength of the golf iron head casting.

The method for vacuum gravity casting a golf iron head of the invention can be cast in a near-vacuum environment, so that it is not necessary to consider the reactivity of various alloy elements with oxygen or nitrogen in the atmosphere when smelting the cast material, and directly The alloying element is once put into the crotch portion of the shell mold for smelting to simplify the compounding step of the casting material and improve the convenience of operation; further, the casting material is smelted in a vacuum furnace even if the alloying element having a lower melting point in the casting material Splashes occur during the smelting process, and the splashed metal liquid does not endanger the safety of the operator. If a cover is provided at the opening of the crotch, the splashed metal liquid will not spill the crotch. It can avoid the loss of casting materials and help to reduce the casting cost.

The method for vacuum gravity casting a golf iron head of the present invention can be realized by The empty casting environment eliminates the steps of slagging and degassing the molten metal to simplify the process and reduce the casting cost, and to avoid affecting the properties of the alloy by the deoxidation effect.

The method for vacuum-casting a golf iron head of the present invention, wherein the shell mold has a connected crotch portion and a casting portion, the casting material can be melted in the crotch portion, and the molten metal is directly in the same environment. Pour into the casting part to ensure accurate casting operation, regardless of the operator's experience, can avoid the overflow of metal liquid or splash, not only can effectively avoid the loss of casting materials to reduce casting costs, but also enhance the operation Work safety for personnel and reduce work injuries.

The method for vacuum-casting a golf iron head of the present invention, wherein the shell mold has a connected crotch portion and a casting portion, the casting material can be melted in the crotch portion, and the molten metal is directly in the same environment. Pour into the casting part, no need to carry the shell mold without causing temperature drop, so it is not necessary to increase the temperature of the preheating shell mold, and the vacuum environment can also improve the fluidity of the molten metal, so that the temperature of the preheated shell mold is even Can be further reduced, helping to reduce the energy consumption of the casting process to reduce casting costs.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

1‧‧‧vacuum furnace

11‧‧ ‧ room

12‧‧‧ Airway tube

13‧‧‧ openings

14‧‧‧ Cover

15‧‧‧Shaft connection

2‧‧‧ shaft

3‧‧‧ stage

31‧‧‧ 承座

311‧‧‧Auxiliary positioning parts

32‧‧‧Adjustment

4‧‧‧heating module

41‧‧‧heater

42‧‧‧Adjustment

43‧‧‧heat transfer cup

5‧‧‧Support

51‧‧‧Abutment locating parts

52‧‧‧Adjustment

6‧‧‧Shell mold

61‧‧‧坩埚

611‧‧‧ accommodating space

62‧‧‧ casting department

621‧‧‧Forming cavity

63‧‧‧Connecting Department

C‧‧‧ cover

M‧‧ motor

N‧‧‧metal liquid

Claims (11)

A vacuum gravity casting method for forming a golf iron head comprises: positioning a shell mold in a vacuum furnace, the shell mold having a crotch portion, a casting portion and a connecting portion, the connecting portion connecting the crotch portion and the casting portion Inside the portion, the inside of the casting portion has a forming cavity, the vacuum furnace is connected to a rotating shaft, and the casting portion of the shell mold is adjacent to the rotating shaft; the at least one metal ingot is placed on the crotch portion of the shell mold. And smelting the metal ingot into a molten metal in a vacuum environment; driving the rotating shaft to laterally pour the vacuum furnace, causing the molten metal to flow into and fill the forming cavity of the casting part by gravity; after the molten metal is completely solidified The shell mold is broken to obtain a casting, the casting comprising a casting portion; the casting portion is separated from the casting to obtain a plurality of golf iron head castings. The method of vacuum gravity casting a golf iron head according to claim 1, wherein the number of the metal ingots is a single one, and the composition of the metal ingot is combined with the cast iron head casting to be cast. The composition of the ingredients is consistent. The method of vacuum gravity casting a golf iron head according to claim 1, wherein the number of the metal ingots is several, and the composition of the molten metal after the melting of the plurality of metal ingots is desired to be cast. The composition of the golf iron head castings is consistent. The method of vacuum gravity casting a golf iron head according to claim 1, wherein the metal ingot is placed in the crotch portion of the shell mold, and a lid is covered at the opening of the crotch portion. The method of vacuum gravity casting a golf iron head according to claim 1, wherein the rotating shaft rotates 45 to 135 degrees to interlock the vacuum furnace laterally, and the rotating shaft interlocks the vacuum furnace from an initial state side. It takes no more than 2 times to dump to the state of "flowing the molten metal from the connecting portion into the casting portion in a direction perpendicular to the ground" second. The method of vacuum gravity casting a golf iron head according to claim 1, wherein the rotating shaft laterally dumps the vacuum furnace to enable molten metal to flow from the connecting portion into the casting portion in a direction perpendicular to the ground. until. The method of vacuum gravity casting a golf iron head according to any one of claims 1 to 6, wherein, after the shell mold is placed in the vacuum furnace, the casting portion of the shell mold is carried by a stage. Positioning, the connecting portion of the shell mold is abutted by a support member, so that the crotch portion of the shell mold can be maintained to extend into the interior of a heater. The method of vacuum gravity casting a golf iron head according to claim 2, wherein the heater is a high frequency coil. The method of vacuum gravity casting a golf iron head according to claim 1, wherein the molding step of the shell mold comprises: preparing a wax embryo comprising a embryo, a plurality of casting embryos, and a Connecting the embryo, one end of the connecting embryo is connected to the circumferential surface of the embryo, each casting embryo is connected to the other end of the connecting embryo; a coating layer is formed on the surface of the wax embryo; the wax embryo and the coating The layer is heated to melt the wax; the dewaxed cladding layer is sintered at a high temperature to form the shell mold, and the crotch portion, the joint portion and the casting portion of the shell mold are integrally connected. The method of vacuum gravity casting a golf iron head according to claim 9, wherein the embryo of the wax embryo has a cylindrical shape, and the embryo has an upper end surface and a lower end surface, the upper end surface and the upper end surface A circumferential surface is connected between the lower end faces, and a diameter of the circumferential surface of the ring is gradually enlarged from the lower end surface toward the upper end surface, so that the circumferential surface of the ring is inclined and forms a draft angle with the axial direction of the ram. The mode angle is 3 to 15 degrees. The method of vacuum gravity casting a golf iron head according to claim 9, wherein the embryo of the wax embryo has a cylindrical shape, and the embryo has an upper end surface and a lower end surface, the upper end surface and the upper end surface A circumferential surface is connected between the lower end faces. The embryo is further provided with a slope which is connected between the lower end surface of the embryo and the connecting embryo, and the inclined surface forms an oblique angle with the axial direction of the embryo, and the inclination angle is 3 to 15 degrees.