Internal mold device for slip casting of quartz crucible

Abstract

The utility model discloses an internal mold device for slip casting of a quartz crucible. The internal mold device comprises a left metal internal mold core, a right metal internal mold core, a middle partition plate and a base, the left metal inner mold core and the right metal inner mold core are two independent parts in mirror symmetry; the left metal inner mold core, the right metal inner mold core and the middle partition plate are assembled into a tight and complete inner mold core, and the middle partition plate is located between the left metal inner mold core and the right metal inner mold core. And the left metal inner mold core, the right metal inner mold core and the middle partition plate are spliced and fixed on the base. According to the utility model, the problem that the biscuit is demoulded and the inner part or the surface is damaged due to the fact that the biscuit molded by casting is tightly held with the mold core of the inner mold is effectively solved, the inner wall of the molded crucible is smooth, no slag falls off, and the qualified rate and the quality stability of the finished crucible are improved.

Description

Technical Field

[0001] The utility model relates to the field of precision manufacturing, in particular to an inner mold device for slip injection molding a quartz crucible. Background Art

[0002] There are some existing technologies related to the preparation mold of corundum crucible in China. For example, the patent specification with the announcement number CN217257020U discloses a preparation mold and molding structure of corundum crucible, including a fixed seat, an outer mold, a crossbeam and an inner mold. The bottom of the outer mold is connected to the fixed seat, the inner mold is arranged in the inner cavity of the outer mold, and a casting cavity is arranged between the inner mold and the outer mold. The crossbeam is arranged at the top of the outer mold and fixedly connected to the inner mold. The inner mold is connected to the outer mold through the crossbeam. A vibrator is installed in the middle of the top of the fixed seat, and the vibrator is arranged in the middle of the bottom of the outer mold. The patented technology installs the vibrator on the base of the outer mold. The vibration of the vibrator facilitates the discharge of bubbles, makes the mold surface smoother, optimizes the molding quality, and achieves the purpose of less pores and high quality.

[0003] At present, it is generally required that the corundum-quartz crucible has good chemical and thermal shock stability; the inner wall surface of the crucible is smooth and does not fall off, which effectively reduces the wall loss of precious metal solution and avoids impurity contamination; the crucible size precision is required to be high.

[0004] In order to ensure the molding accuracy, inner wall smoothness and thermal shock stability of the crucible, solid grouting molding is generally adopted. The outer mold is a gypsum mold, and the inner mold core is a metal mold (the metal mold core can ensure the inner wall of the molded crucible is smooth and does not fall off through surface polishing). The outer mold gypsum mold and the inner mold metal mold core are combined to form an internal grouting molding cavity. The top of the outer mold gypsum mold is left with a grouting opening. The slurry water injected into the cavity is absorbed by the inner cavity wall of the outer gypsum mold. The slurry in the cavity is dehydrated and gradually solidified. In this process, due to the solidification and shrinkage of the slurry, the molded blank and the inner mold metal mold core are tightly held and cannot be completely demolded. The conventional forced extraction mode demolding generally damages the molded blank, causing damage to the inside or surface of the blank, thereby affecting the surface smoothness and thermal shock resistance of the finished crucible. To this end, we propose an inner mold device for grouting quartz crucible. Utility Model Content

[0005] In view of the above-mentioned technical problems and the shortcomings in the field, the utility model provides an inner mold device for slurry injection molding of quartz crucibles. By providing a series of structures, the device can avoid the problem of internal or surface damage of the green billet during demolding caused by the casting and molding green billet and the inner mold core being tightly embraced during use. The inner wall of the molded crucible is smooth and does not fall off, thereby improving the qualified rate of the finished crucibles and the stability of product quality.

[0006] The specific technical solutions are as follows:

[0007] An inner mold device for slip casting quartz crucible, comprising a left metal inner mold core, a right metal inner mold core, a middle partition and a base;

[0008] The left metal inner mold core and the right metal inner mold core are two independent parts that are mirror-symmetrical;

[0009] The left metal inner mold core, the right metal inner mold core and the middle partition are assembled into a tight and complete inner mold core, and the middle partition is located between the left metal inner mold core and the right metal inner mold core;

[0010] The left metal inner mold core, the right metal inner mold core and the middle partition are assembled and fixed on the base.

[0011] In some embodiments, the inner mold device for slurry injection molding of quartz crucibles, the left metal inner mold core, the right metal inner mold core, the middle partition and the base are made of hard aluminum alloy material, which is lighter in texture than stainless steel material, has high cost performance and is easy to operate manually.

[0012] In some embodiments, the inner mold device for slurry injection molding of quartz crucibles has grooves on the joint surfaces of the left metal inner mold core and the right metal inner mold core to reduce the contact area with the middle partition plate, so as to facilitate the operation of pulling the middle partition plate out from the middle of the metal inner mold core when demolding the blank after casting.

[0013] In some embodiments, the inner mold device for slurry injection molding of quartz crucible has a concave guide groove longitudinally provided on the joint surface of the left metal inner mold core and the right metal inner mold core, and a middle partition is provided with convex guide blocks on both sides corresponding to the left metal inner mold core and the right metal inner mold core. The concave guide groove and the convex guide block are tightly spliced ​​and can slide smoothly, thereby preventing the inner wall of the crucible blank from being damaged when the middle partition is pulled out from the middle of the metal inner mold core.

[0014] In some embodiments, the inner mold device for slurry injection molding of quartz crucibles has a convex assembly part at the bottom where the left metal inner mold core and the right metal inner mold core contact the base, and a concave assembly opening is opened on the top surface of the base, the concave assembly opening can accommodate the complete inner mold core, and the convex assembly part and the concave assembly opening are tightly assembled.

[0015] In some embodiments, the inner mold device for slip casting quartz crucible has a middle partition fixedly plugged into the base. Further, in some embodiments, a convex insertion portion is provided at the bottom of the middle partition in contact with the base, and an interface is provided on the top surface of the base, and the convex insertion portion and the interface are tightly spliced.

[0016] In some embodiments, the inner mold device for slip casting quartz crucible has an outer mold assembly step on the periphery of the base for assembling and fixing the outer mold, so that the outer mold can be assembled with the inner mold device to form an internal slip casting molding cavity. The outer mold can be a plaster mold.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model adopts an assembled design structure for the inner mold for pouring the quartz crucible, which effectively solves the problem of internal or surface damage of the green billet due to the tight embrace between the casting green billet and the inner mold core. The inner wall of the formed crucible is smooth and does not fall off, thereby improving the qualified rate of the finished crucible and the stability of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an inner mold device for slip casting a quartz crucible in a specific implementation manner;

[0020] Figure 2 It is a structural schematic diagram of the joint surface of the metal inner mold core in a specific implementation manner;

[0021] Figure 3 It is a structural schematic diagram of the middle partition in a specific implementation manner;

[0022] Figure 4 It is a structural schematic diagram of the base in a specific implementation manner. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] Example 1

[0025] The inner mold device for slip casting quartz crucible of this embodiment is shown in FIG. Figure 1 , including a left metal inner mold core 1, a right metal inner mold core 2, a middle partition 3 and a base 4. The left metal inner mold core 1 and the right metal inner mold core 2 are two separate independent parts with mirror-uniform symmetry. The left metal inner mold core 1, the right metal inner mold core 2 and the middle partition 3 can be assembled into a strict and complete inner mold core, and the middle partition 3 is located in the middle of the left metal inner mold core 1 and the right metal inner mold core 2. The left metal inner mold core 1, the right metal inner mold core 2 and the middle partition 3 are assembled and fixed on the base 4 to form a complete inner mold device.

[0026] In this embodiment, the left metal inner mold core 1, the right metal inner mold core 2, the middle partition plate 3 and the base 4 can be made of hard aluminum alloy material.

[0027] When using the inner mold device for grouting quartz crucible of the present embodiment, the middle partition 3 can be assembled and fixed on the base 4 first, and then the left metal inner mold core 1 and the right metal inner mold core 2 are symmetrically assembled and fixed on the base 4, and finally the corresponding outer mold gypsum mold is assembled and fixed on the base 4, and a closed mold cavity for grouting molding is formed between the inner and outer molds, and the required slurry is injected from the top opening of the outer mold gypsum mold. After the grouting blank is solidified and formed, the whole set of inner and outer molds are turned upside down as a whole (that is, the outer mold gypsum mold is at the bottom, and the inner mold mold is at the top), and then the base 4 is pulled up to be taken out, and then the middle partition 3 is pulled out, and the loosened left metal inner mold core 1 and the right metal inner mold core 2 are further gently taken out from the inner cavity of the blank, and finally the outer mold gypsum mold is inverted, and the blank automatically falls off from the inner cavity of the outer mold gypsum mold, and the required blank product is taken out.

[0028] Example 2

[0029] See also Figures 1 to 4 , based on the inner mold device for slip casting quartz crucible of Example 1, the following improvements are made:

[0030] like Figure 2 As shown, a groove 7 of a certain depth is provided in the central area of ​​the joint surface of the left metal inner mold core 1 and the right metal inner mold core 2. The groove 7 can specifically be a concave rectangular surface, which can reduce the contact area between the joint surface of the left metal inner mold core 1 and the right metal inner mold core 2 and the middle partition 3 after assembly, so as to facilitate the middle partition 3 to be pulled out from between the left metal inner mold core 1 and the right metal inner mold core 2 during the later casting and demolding operation.

[0031] See also Figure 2 , Figure 3 A concave guide groove 5 is longitudinally provided on the center line of the joint surface of the left metal inner mold core 1 and the right metal inner mold core 2, and a convex guide block 8 is provided at the center line position of the two surfaces of the middle partition plate 3 corresponding to the left metal inner mold core 1 and the right metal inner mold core 2. The concave guide groove 5 and the convex guide block 8 can be tightly spliced ​​and can slide smoothly, which can prevent the middle partition plate 3 from damaging the inner wall of the crucible blank when it is pulled out from between the left metal inner mold core 1 and the right metal inner mold core 2.

[0032] See also Figure 2 , Figure 4 A convex assembling portion 6 is provided at the bottom where the left metal inner mold core 1 and the right metal inner mold core 2 contact the base 4, and a concave assembling opening 10 is provided on the top surface of the base 4. The concave assembling opening 10 can accommodate the complete inner mold core. The convex assembling portion 6 and the concave assembling opening 10 can be tightly assembled to prevent the left metal inner mold core 1 and the right metal inner mold core 2 from slipping against each other after being assembled with the base 4, thereby affecting the integrity of the casting blank.

[0033] The middle partition 3 is plugged and fixed to the base 4. For details, see Figure 3 , Figure 4 A convex insertion portion 9 is provided at the bottom where the middle partition 3 contacts the base 4, and an interface 12 is provided on the top surface of the base 4. The convex insertion portion 9 and the interface 12 can be tightly assembled to prevent the middle partition 3 and the fixed base 4 from slipping against each other after assembly, thereby affecting the integrity of the cast blank.

[0034] See also Figure 4 The outer periphery of the base 4 is an outer mold assembly step 11, which is used to assemble and fix the outer mold plaster mold, so that the outer mold plaster mold can be assembled with the inner mold device to form an internal grouting molding cavity.

[0035] When using the inner mold device for grouting quartz crucible of the present embodiment, the bottom convex insertion portion 9 of the middle partition 3 can be first inserted into the interface 12 of the base 4, and then the bottom convex assembly portions 6 of the left metal inner mold core 1 and the right metal inner mold core 2 can be symmetrically inserted into the concave assembly opening 10 of the base 4, and finally the corresponding outer mold gypsum mold is buckled into the outer mold assembly step 11, and a closed mold cavity for grouting molding is formed between the inner and outer molds, and the required slurry is injected from the top opening of the outer mold gypsum mold. After the grouting blank is solidified and formed, the whole set of inner and outer molds are turned upside down as a whole (that is, the outer mold gypsum mold is at the bottom, and the inner mold mold is at the top), and then the base 4 is pulled up to be taken out, and then the middle partition 3 is pulled out, and the loosened left metal inner mold core 1 and the right metal inner mold core 2 are further gently taken out from the blank inner cavity, and finally the outer mold gypsum mold is inverted, and the blank automatically falls off from the inner cavity of the outer mold gypsum mold, and the required blank product is taken out.

[0036] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. An inner mold device for slip casting quartz crucible, characterized in that: It comprises a left metal inner mold core (1), a right metal inner mold core (2), a middle partition (3) and a base (4); The left metal inner mold core (1) and the right metal inner mold core (2) are two independent parts with mirror symmetry; The left metal inner mold core (1), the right metal inner mold core (2) and the middle partition plate (3) are assembled into a tightly integrated inner mold core, and the middle partition plate (3) is located between the left metal inner mold core (1) and the right metal inner mold core (2); The left metal inner mold core (1), the right metal inner mold core (2) and the middle partition plate (3) are assembled and fixed on the base (4).

2. The inner mold device for slip casting quartz crucible according to claim 1, characterized in that: The left metal inner mold core (1), the right metal inner mold core (2), the middle partition plate (3) and the base (4) are made of hard aluminum alloy material.

3. The inner mold device for slip casting quartz crucible according to claim 1, characterized in that: A groove (7) is provided on the joint surface of the left metal inner mold core (1) and the right metal inner mold core (2) to reduce the contact area with the middle partition plate (3).

4. The inner mold device for slip casting quartz crucible according to claim 1, characterized in that: A concave guide groove (5) is longitudinally provided on the joint surface of the left metal inner mold core (1) and the right metal inner mold core (2), and a convex guide block (8) is provided on the two surfaces of the middle partition plate (3) corresponding to the left metal inner mold core (1) and the right metal inner mold core (2). The concave guide groove (5) and the convex guide block (8) are tightly joined and can slide smoothly.

5. The inner mold device for slip casting quartz crucible according to claim 1, characterized in that: The bottom of the left metal inner mold core (1) and the right metal inner mold core (2) in contact with the base (4) is provided with a convex assembly portion (6), and the top surface of the base (4) is provided with a concave assembly opening (10), and the concave assembly opening (10) can accommodate the complete inner mold core, and the convex assembly portion (6) and the concave assembly opening (10) are tightly assembled.

6. The inner mold device for slip casting quartz crucible according to claim 1 or 5, characterized in that: The middle partition (3) is plugged and fixed to the base (4); A convex insertion portion (9) is provided at the bottom of the middle partition (3) where it contacts the base (4), and an interface (12) is provided on the top surface of the base (4). The convex insertion portion (9) and the interface (12) are tightly assembled.

7. The inner mold device for slip casting quartz crucible according to claim 1, characterized in that: The outer periphery of the base (4) is an outer mold assembly step (11) for assembling and fixing the outer mold.

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