A graphite crucible preparation mold and preparation method

Abstract

The application belongs to the technical field of graphite crucible, and particularly relates to a graphite crucible preparation mold and a preparation method thereof, which comprises that the upper surface of a mold cavity bottom plate is fixedly connected with symmetrically distributed supporting blocks. The graphite crucible mold and the preparation method thereof are as follows: raw materials are put into a mold cavity, an upper mold is lowered and pressurized, the raw materials are injected into the mold cavity, the upper press oil cylinder is controlled to pressurize and drive a movable frame to perform secondary pressurization on the raw materials to improve the compactness of a product, and a complete product is obtained; the machine table pressure is removed, the upper and lower molds are separated, and the upper press oil cylinder continues to go up to realize demolding. The graphite crucible mold can produce high-quality and high-efficiency products, realizes that a tolerance is less than 0.3%, the compressive strength is increased from 30 MPa to 70 MPa, the service life is increased from 1 month to 18 months, and the original use temperature range of 600-1000 DEG is changed to 1500-1700 DEG, so that many superior performances that cannot be achieved by traditional graphite crucible are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of graphite crucible, and particularly relates to a preparation mold and a preparation method of a graphite crucible. BACKGROUND

[0002] In the existing lithium battery recycling process, one way is to heat and melt the disassembled electrode material to extract metal components. Due to the melting point of the electrode material, the heating temperature needs to be as high as 1700 degrees Celsius, and a high-temperature-resistant crucible is needed. Therefore, an innovative graphite crucible is used. In the high-temperature-resistant process, the graphite can be used to heat the material in the crucible by using the electrode. Precise size positioning and accurate mechanical hand grabbing are required on the production line. The graphite crucible is a key technical tool in this process. The existing technology adopts mechanical processing on the graphite block material to produce the graphite crucible through cutting and grinding. Such a production process has problems such as material waste, long processing time, and difficulty in achieving the specified requirements of accuracy. In particular, the material properties do not meet the requirements. Moreover, the brittleness of the graphite material causes the crucible to be used for a very short time, and the actual production service life is very short and will crack, requiring replacement of a new crucible, which seriously affects the production efficiency, increases the production cost, and seriously limits the expansion of production capacity.

[0003] The rapid development of new energy urgently needs a large amount of lithium material. The innovative high-temperature-resistant crucible mold contributes to the recycling and environmental protection of lithium batteries and produces a new type of crucible with high precision, high temperature resistance, and long service life to meet the process requirements of high-temperature processing. SUMMARY

[0004] Based on the technical problems of material waste, long processing time, and difficulty in achieving the specified requirements of accuracy in the existing preparation of graphite crucibles, the present application provides a preparation mold and a preparation method of a graphite crucible.

[0005] The preparation mold and the preparation method of the graphite crucible provided by the present application comprise a cavity bottom plate, the upper surface of the cavity bottom plate is fixedly connected with symmetrically distributed support blocks, the upper surface of the support blocks is fixedly connected with a lower mold frame, the outer surface of the cavity bottom plate is provided with an upper pressing mechanism, and the upper pressing mechanism comprises an upper pressing oil cylinder and a movable frame. The upper pressing oil cylinder drives the movable frame to move horizontally along the height direction of the lower mold frame, and the upper pressing oil cylinder located on the outer surface of the cavity bottom plate is extended to realize the demolding action of the graphite crucible product.

[0006] Preferably, the two upper pressing oil cylinders are symmetrically distributed with the axis of the cavity bottom plate as the center of symmetry, wherein the two upper pressing oil cylinders are fixedly installed on the front surface and the back surface of the cavity bottom plate, respectively, and an inner mold core is fixedly connected to the center of the upper surface of the cavity bottom plate.

[0007] Preferably, the movable frame is fixedly connected at one end of the piston rod of the upper oil cylinder, the inner wall of the movable frame is slidably sleeved with the outer surface of the inner mold core, the upper surface of the lower mold frame is uniformly distributed with precise guide holes, and the inner wall of the precise guide hole is slidably connected with the upper mold plate with a guide rod.

[0008] Preferably, the lower surface of the upper mold plate is in contact with the upper surface of the lower mold frame, the lower surface of the upper mold plate is fixedly connected with the upper mold core, and when the upper mold core is combined with the lower mold frame, the gap between the inner mold core and the movable frame forms a mold cavity.

[0009] Preferably, a preparation method of a graphite crucible preparation mold is provided, and the specific preparation method is as follows: step one, forming: the graphite raw material is put into the mold cavity, after the putting is completed, the rear upper mold plate is lowered to combine with the lower mold frame, the movable frame is driven to move in opposite directions by the upper mold core and the upper oil cylinder, and bidirectional pressure is formed, so that the graphite crucible product is formed by mold pressing.

[0010] Step two, demolding: the upper mold plate drives the upper mold core to move and leave the demolding track, at this time, reverse pressurization is adopted, the movable frame is vertically moved upward along the height direction of the lower mold frame by the upper oil cylinder, and the prepared graphite crucible product is vertically ejected from the mouth part of the graphite crucible product.

[0011] The beneficial effects in the application are:

[0012] 1. The graphite crucible product can realize a tolerance less than 0.3%, the compression strength is increased from 30 MPa to 70 MPa, the service life is increased from 1 month to 18 months, the traditional graphite crucible is limited in use range of 600-1000 DEG C, and now can reach 1700 DEG C, so that many superior performances that the traditional graphite crucible cannot reach are greatly improved.

[0013] 2. By setting the upper pressing mechanism, mold pressing is adopted to replace mechanical processing, the mold is divided into four parts through the innovative four-section mold structure, the upper mold plate drives the upper mold core to move and leave the demolding track, at this time, reverse pressurization is adopted, the movable frame is vertically moved upward along the height direction of the inner mold core by the upper oil cylinder, and the prepared graphite crucible product is vertically ejected from the mouth part of the graphite crucible product (in the forming stage, the movable frame is driven to move in opposite directions by the upper mold core and the oil cylinder, bidirectional pressure is formed, the loose phenomenon of the product mouth part during material forming is overcome, and the product strength and service life are improved); in addition, the force point of the upper pressing mechanism is at the product mouth part, instead of the traditional product bottom, the brittleness of the product can be overcome, the bottom is prevented from being broken, and the yield of the brittle product demolding is realized. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of a graphite crucible preparation mold and a preparation method;

[0015] Figure 2 It is a lower mold frame structure perspective view of a preparation mold and preparation method of graphite crucible;

[0016] Figure 3 It is a movable frame movable part structure perspective view of a preparation mold and preparation method of graphite crucible;

[0017] Figure 4 It is a lower mold core structure perspective view of a preparation mold and preparation method of graphite crucible;

[0018] Figure 5 It is a right view of inner mold core structure of a preparation mold and preparation method of graphite crucible.

[0019] In the figure: 1, cavity bottom plate; 2, support block; 3, lower mold frame; 4, upper pressing oil cylinder; 5, movable frame; 6, inner mold core; 7, precise guide hole; 8, upper mold plate; 9, upper mold core; 10, mold cavity; 11, graphite crucible product. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0021] Reference Figures 1-5 Since new energy lithium materials urgently need high-temperature-resistant containers, the present application proposes a preparation mold and preparation method of graphite crucible using a multifunctional mold in cooperation with a special press, which comprises a cavity bottom plate 1, the upper surface of the cavity bottom plate 1 is fixedly connected with symmetrically distributed support blocks 2, the upper surface of the support blocks 2 is fixedly connected with a lower mold frame 3, through the cooperation of the support blocks 2 and the lower mold frame 3, an active space for subsequent convenient ejection of the graphite crucible product 11 is left between the upper and lower sides of the cavity bottom plate 1 and the lower surface of the lower mold frame 3, an upper pressing mechanism is arranged on the outer surface of the cavity bottom plate 1, and the upper pressing mechanism comprises an upper pressing oil cylinder 4 and a movable frame 5, the upper pressing oil cylinder 4 drives the movable frame 5 to move horizontally along the height direction of the lower mold frame 3 through extension and retraction, and the upper pressing oil cylinder 4 realizes demolding action on the graphite crucible product 11 through the extension action on the outer surface of the cavity bottom plate 1, realizes the double-acting mold pressing action through the single-acting press, and can also eject the product. This mold is flexible and multi-purpose, has less investment and fast effect.

[0022] Further, in order to realize the installation of the upper pressing oil cylinder 4, the two upper pressing oil cylinders 4 are symmetrically distributed with the axis of the cavity bottom plate 1 as the center of symmetry, wherein the two upper pressing oil cylinders 4 are fixedly installed on the front face and the back face of the cavity bottom plate 1 respectively, thereby facilitating the automatic demolding action of the graphite crucible product 11 by the movable frame 5 driven by the upper pressing oil cylinder 4, and the force point is at the product mouth during the ejection of the ejection mechanism, instead of the traditional product bottom, so that the brittleness of the product can be overcome, the bottom is prevented from being broken, the yield of the brittle product demolding is realized, and the inner mold core 6 is fixedly connected at the center of the upper surface of the cavity bottom plate 1.

[0023] Further, in order to realize the movement direction of the upper die plate 8, the movable frame 5 is fixedly connected at one end of the piston rod of the upper pressing oil cylinder 4, the inner wall of the movable frame 5 is in sliding sleeve connection with the outer surface of the inner mold core 6, and the inner mold core 6 is arranged to limit and guide the movement direction of the movable frame 5 when the movable frame 5 moves; the lower mold frame 3 and the upper surface of the upper die plate 8 are uniformly provided with precise guide holes 7, and the precise guide holes 7 realize the precise guidance of the movement track of the upper and lower molds when the upper die plate 8 is clamped and demolded, and the precise guide holes 7 first guide the concentricity of the mold during pressing.

[0024] Further, in order to realize the molding of the graphite crucible product 11, the lower surface of the upper die plate 8 is in contact with the upper surface of the lower mold frame 3, the lower surface of the upper die plate 8 is fixedly connected with the upper mold core 9, the upper mold core 9 is clamped with the lower mold frame 3, and the raw material is extruded into the lower mold frame 3 through the generated pressure, the gap between the inner mold core 6 and the movable frame 5 constitutes a mold cavity 10, the upper pressing oil cylinder 4 drives the movable frame 5 to press upward to recompact the raw material of the four sides to form a qualified product, the upper mold core 9 returns to the original position after unloading, at this time the movable frame 5 continues to move upward to eject the product, the upper mold core 9 and the movable frame 5 are driven by the upper pressing oil cylinder 4 to move towards each other, forming a bidirectional pressure, and the graphite block material in the mold cavity 10 is pressed, so that the graphite crucible product 11 is molded and formed.

[0025] The graphite crucible product 11 can realize a tolerance of less than 0.3%, the compression strength is increased from 30 MPa to 70 MPa, the service life is increased from one month to 18 months, and the temperature resistance range is increased from 600-1000 ° to 1500-1700 °, so that the problem that the precision of the existing graphite crucible cannot be achieved is solved.

[0026] By setting the upper pressing mechanism, using die pressing instead of machining, through the innovative four-section mold structure, the mold is split into four pieces, the upper mold plate 8 drives the upper mold core 9 to move the mold to leave the demolding track, at this time, using reverse pressurization, the upper pressing oil cylinder 4 drives the movable frame 5 to move horizontally along the height direction of the lower mold frame 3, and the graphite crucible product 11 is vertically ejected from the mouth of the prepared graphite crucible product 11. In the forming stage, through the opposite movement of the upper mold core 9 and the upper pressing oil cylinder 4 driving the movable frame 5, a bidirectional pressure is formed, which overcomes the strength drop caused by the drop of the product mouth density during forming. In addition, the force point of the ejection mechanism is at the product mouth when ejection, instead of the traditional product bottom, which can overcome the brittleness of the product and avoid the bottom being broken, realizing the yield rate of the brittle product demolding.

[0027] Working principle: step one, forming, the graphite block material is put into the mold cavity 10, after the completion of the input, the upper mold plate 8 is pressed to combine with the lower mold frame 3, through the opposite movement of the upper mold core 9 and the upper pressing oil cylinder 4 driving the movable frame 5, a bidirectional pressure is formed, thereby realizing the die pressing forming of the graphite crucible product 11.

[0028] Step two, demolding, the upper mold plate 8 drives the upper mold core 9 to move the mold to leave the demolding track, at this time, using reverse pressurization, the upper pressing oil cylinder 4 drives the movable frame 5 to move vertically along the height direction of the lower mold frame 3, and the graphite crucible product 11 is vertically ejected from the mouth of the prepared graphite crucible product 11.

[0029] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for producing a graphite crucible production mold comprising a graphite crucible production mold including a cavity bottom plate (1), characterized by: The upper surface of the cavity bottom plate (1) is fixedly connected with symmetrically distributed support blocks (2), the upper surface of the support blocks (2) is fixedly connected with lower mold frames (3), the outer surface of the cavity bottom plate (1) is provided with an upper pressing mechanism, and the upper pressing mechanism comprises upper pressing oil cylinders (4) and movable frames (5), the upper pressing oil cylinders (4) drive the movable frames (5) to move horizontally along the height direction of the lower mold frames (3) through telescopic driving, and the upper pressing oil cylinders (4) extending out of the outer surface of the cavity bottom plate (1) realize the demolding action of the graphite crucible product (11); Two upper pressing oil cylinders (4) are symmetrically distributed with the axis of the cavity bottom plate (1) as the center of symmetry, wherein the two upper pressing oil cylinders (4) are fixedly installed on the front surface and the back surface of the cavity bottom plate (1) respectively, the upper surface center of the cavity bottom plate (1) is fixedly connected with an inner mold core (6), the movable frame (5) is fixedly connected to one end of the piston rod of the upper pressing oil cylinder (4), the inner wall of the movable frame (5) is slidably sleeved with the outer surface of the inner mold core (6), the upper surface of the lower mold frame (3) is uniformly provided with precise guide holes (7), the inner wall of the precise guide hole (7) is slidably connected with an upper mold plate (8) with a guide rod, the lower surface of the upper mold plate (8) is in contact with the upper surface of the lower mold frame (3), the lower surface of the upper mold plate (8) is fixedly connected with an upper mold core (9), when the upper mold core (9) is combined with the lower mold frame (3), the gap between the inner mold core (6) and the movable frame (5) constitutes a mold cavity (10); The preparation method comprises the following steps: Step one, forming: graphite raw materials are put into the mold cavity (10), after the feeding is completed, the rear upper mold plate (8) is lowered to combine with the lower mold frame (3), the opposite movement of the movable frame (5) is driven by the upper mold core (9) and the upper pressing oil cylinder (4), a bidirectional pressure is formed, so that the graphite crucible product (11) is molded and formed; Step two, demolding: the upper mold plate (8) drives the upper mold core (9) to move and leave the demolding track, at this time, reverse pressurization is adopted, the movable frame (5) is driven by the upper pressing oil cylinder (4) to move vertically upward along the height direction of the lower mold frame (3), and the prepared graphite crucible product (11) is vertically ejected from the mouth of the graphite crucible product (11).

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