Cold isostatic pressing die

Abstract

This invention relates to the field of target forming technology, and in particular to a cold isostatic pressing mold. It includes a forming unit, a mold cap, and a mold shaft. The forming unit has an opening and a receiving cavity with an opening, which are relatively closed. The upper and lower ends of the mold shaft are respectively confined within the receiving cavity by mold pads. The mold shaft, mold pads, and forming unit form a mold cavity. The mold cap seals the opening and is detachably connected to the forming unit. Its advantages are: the upper and lower ends of the mold shaft are respectively confined within the receiving cavity by mold pads, which helps stabilize the mold shaft's posture within the receiving cavity and prevents eccentricity after target blank forming; the forming unit has an opening that is relatively closed within the receiving cavity, facilitating the smooth entry of hydraulic oil, improving the uniformity of stress on the raw material during the cold isostatic pressing process, resulting in a uniform density distribution of the target material after cold isostatic pressing, and also contributing to uniform shrinkage in all directions during sintering.

Description

Technical Field

[0001] This invention relates to the field of target forming technology, and in particular to a cold isostatic pressing mold. Background Technology

[0002] The process of producing ITO (Indium Tin Oxide) sputterable material from powder material involves a series of steps. One major factor determining the sintering density of the target is the density of the raw target blank after molding. Current molding methods mostly involve cold isostatic pressing, which requires high-performance molds to ensure uniform and dense composition after the raw target blank is formed.

[0003] The cold isostatic pressing (CIP) process for ITO powder requires the powder to withstand omnidirectional pressure exceeding 200 MPa. A CIP mold for an ITO rotating target, disclosed in publication number CN114523551A, uses rigid materials at its top and bottom ends and elastic sleeves on its sides. During the CIP process, uneven stress is easily observed at the junction of the sleeves and the rigid materials, leading to uneven density distribution of the target material and consequently affecting the density of the target material after sintering. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing molds suffer from uneven stress during cold isostatic pressing.

[0005] To solve the above-mentioned technical problems, the present invention provides a cold isostatic pressing mold, including a forming unit, a mold cap, and a mold shaft. The forming unit has an opening and a receiving cavity with an opening. The opening and the receiving cavity are relatively closed. The upper and lower ends of the mold shaft are respectively limited to the receiving cavity by mold pads. The mold shaft, the mold pads, and the forming unit form a mold cavity. The mold cap seals the opening and is detachably connected to the forming unit.

[0006] The above technical solution includes a mold sleeve and an outer mold frame. The mold sleeve has the receiving cavity, and the outer mold frame is sleeved on the outer side wall of the receiving cavity. The outer mold frame has the opening.

[0007] In the above technical solution, the mold sleeve includes a sleeve body and a flange. The sleeve body has the receiving cavity, the flange is located on the outside of the opening, the flange and the sleeve body form an installation cavity, and the end of the outer mold frame extends into the installation cavity.

[0008] In the above technical solution, the edge of the mold cap is provided with a downwardly extending mounting part, and the mounting part is connected to the flange by a hose clamp.

[0009] In the above technical solution, handles are provided on both opposite sides of the outer mold frame.

[0010] In the above technical solution, the opening includes a first opening and a second opening, the first opening is provided on the side wall of the outer mold frame, and the second opening is provided on the bottom wall of the outer mold frame.

[0011] In the above technical solution, the upper end of the mold shaft is provided with an upper mold pad, the upper mold pad having a first inclined surface, the lower end of the mold shaft is provided with a lower mold pad, the lower mold pad having a second inclined surface, and the first inclined surface and the second inclined surface are arranged opposite to each other along the axial direction of the mold shaft.

[0012] In the above technical solution, the first inclined surface extends upward from the inside to the outside, and the second inclined surface extends downward from the inside to the outside.

[0013] In the above technical solution, the cross-sectional area of ​​the mold shaft gradually decreases from top to bottom.

[0014] In the above technical solution, the outer surface of the mold shaft is provided with an anodized layer.

[0015] Compared with the prior art, the cold isostatic pressing mold of this invention has the following advantages: the receiving cavity can accommodate the mold shaft, allowing the mold cavity formed by the mold shaft, mold pad, and forming unit to hold the raw material, which is beneficial for the present invention to press the raw material into a target blank through the cold isostatic pressing process; the upper and lower ends of the mold shaft are respectively limited in the receiving cavity by the mold pad, which helps to stabilize the posture of the mold shaft in the receiving cavity and prevents the target blank from becoming eccentric after forming; the forming unit has an opening that is relatively closed to the receiving cavity, which facilitates the smooth entry of hydraulic oil, improves the uniformity of stress on the raw material during the cold isostatic pressing process, makes the density distribution of the target material uniform after the cold isostatic pressing process, and is beneficial for the present invention to achieve uniform shrinkage in all directions during sintering. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of a cold isostatic pressing mold according to an embodiment of the present invention;

[0017] Figure 2 This is a cross-sectional schematic diagram of the outer mold frame according to an embodiment of the present invention;

[0018] Figure 3 This is a top view of the outer mold frame according to an embodiment of the present invention;

[0019] Figure 4 This is a cross-sectional schematic diagram of the mold sleeve according to an embodiment of the present invention;

[0020] In the figure, 100 is the mold cavity; 1 is the molding unit; 101 is the first opening; 102 is the second opening; 11 is the mold sleeve; 111 is the sleeve body; 112 is the flange; 12 is the outer mold frame; 121 is the handle; 2 is the mold cap; 21 is the mounting part; 3 is the mold shaft; 31 is the upper mold pad; and 32 is the lower mold pad. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., used in this invention to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] If the terms "first" and "second" are used only to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, a preferred embodiment of the present invention provides a cold isostatic pressing mold, comprising a forming unit 1, a mold cap 2, and a mold shaft 3. The forming unit 1 has an opening and a receiving cavity with an opening, which are relatively closed. The upper and lower ends of the mold shaft 3 are respectively limited to the receiving cavity by mold pads. The mold shaft 3, the mold pads, and the forming unit 1 form a mold cavity 100. The mold cap 2 seals the opening and is detachably connected to the forming unit 1.

[0026] It is understood that the receiving cavity can accommodate the mold shaft 3, allowing the mold cavity 100 formed by the mold shaft 3, the mold pad, and the forming unit 1 to hold the raw material, which is beneficial for the present invention to press the raw material into a target blank through the cold isostatic pressing process; the upper and lower ends of the mold shaft 3 are respectively limited in the receiving cavity by the mold pad, which helps to stabilize the posture of the mold shaft 3 in the receiving cavity and avoids eccentricity after the target blank is formed; the forming unit 1 has an opening that is relatively closed to the receiving cavity, which facilitates the smooth entry of hydraulic oil, improves the uniformity of the stress on the raw material during the cold isostatic pressing process, makes the density distribution of the target material uniform after the cold isostatic pressing process, and is beneficial for the present invention to shrink uniformly in all directions during sintering.

[0027] like Figure 1 , Figure 2 and Figure 4 As shown, it further includes a mold sleeve 11 and an outer mold frame 12. The mold sleeve 11 has a receiving cavity, and the outer mold frame 12 is sleeved on the outer side wall of the receiving cavity. The outer mold frame 12 has an opening.

[0028] It is understood that the mold sleeve 11 can cooperate with the mold shaft 3 and the mold pad to form the mold cavity 100 to complete the cold isostatic pressing treatment of the target blank. The outer mold frame 12 has openings to facilitate the smooth entry of hydraulic oil, which can improve the uniformity of stress on the raw material during the cold isostatic pressing process, make the density distribution of the target material uniform after the cold isostatic pressing process, and facilitate the uniform shrinkage in all directions during sintering of the present invention.

[0029] Preferably, the outer mold frame 12 is integrally welded together.

[0030] like Figure 1 and Figure 4 As shown, the mold sleeve 11 further includes a sleeve body 111 and a flange 112. The sleeve body 111 has an accommodating cavity, and the flange 112 is located on the outside of the opening. The flange 112 and the sleeve body 111 form an installation cavity, and the end of the outer mold frame 12 extends into the installation cavity.

[0031] It is understandable that the flange 112, by forming an installation cavity with the sleeve 111, allows the outer mold frame 12 to be interference-fitted with the installation cavity, thereby improving the overall structural strength of the mold sleeve 11, which is beneficial for the raw material to form a target blank through the cold isostatic pressing process.

[0032] like Figure 1 As shown, in one embodiment, the edge of the mold cap 2 is provided with a downwardly extending mounting portion 21, which is connected to the flange 112 by a hose clamp.

[0033] In the above embodiment, the mounting part 21 provided on the edge of the mold cap 2 provides a position for the connection between the mold cap 2 and the flange 112, so that the hose clamp can improve the sealing effect of the mold cap 2 on the opening by connecting the flange 112 and the mold cap 2.

[0034] like Figure 1 and Figure 4 As shown, handles 121 are further provided on both opposite sides of the outer mold frame 12. After the raw material in the mold cavity 100 is subjected to cold isostatic pressing, the handles 121 provide a point of leverage for the workers to complete the demolding of the target blank.

[0035] like Figure 2 and Figure 3 As shown, the opening further includes a first opening 101 and a second opening 102. The first opening 101 is provided on the side wall of the outer mold frame 12, and the second opening 102 is provided on the bottom wall of the outer mold frame 12.

[0036] Understandably, this setup can increase the uniformity of powder stress after cold isostatic pressing, resulting in a uniform density distribution of the target material after cold isostatic pressing, and uniform shrinkage in all directions during sintering.

[0037] Preferably, the first opening 101 is located at 10% to 80% of the total length of the outer mold frame 12, and the number of the first opening 101 is 4 to 6 rows and 5 to 7 columns, the hole diameter is 4 to 9 mm, and the chamfer is 0.3 to 1 mm;

[0038] Preferably, the second opening 102 is located 50-70mm from the bottom center, and there are 7-9 openings with a diameter of 4-9mm and a chamfer of 0.3-1mm.

[0039] like Figure 1 As shown, the upper end of the mold shaft 3 is provided with an upper mold pad 31, which has a first inclined surface, and the lower end of the mold shaft 3 is provided with a lower mold pad 32, which has a second inclined surface. The first inclined surface and the second inclined surface are arranged opposite to each other along the axial direction of the mold shaft 3.

[0040] It is understandable that the first and second inclined surfaces are arranged opposite each other along the axial direction of the mold shaft 3, which can effectively alleviate the phenomenon of deformation and tilting of the upper and lower end faces of the target material after the cold isostatic pressing process.

[0041] Preferably, the inclination angle of the first inclined plane and the inclination angle of the second inclined plane are both within the range of 0 to 30°.

[0042] like Figure 1 As shown, in one embodiment, the first inclined surface extends upward from the inside to the outside, and the second inclined surface extends downward from the inside to the outside.

[0043] Furthermore, the cross-sectional area of ​​the mold shaft 3 gradually decreases from top to bottom.

[0044] Understandably, the cross-sectional area of ​​the mold shaft 3 gradually decreases from top to bottom, which allows the inner diameters of the upper and lower ends of the sintered target material to be similar, thus reducing the occurrence of flared mouths. This design can reduce grinding and cutting allowances and increase the yield of finished target materials.

[0045] Preferably, the outer surface of the mold shaft 3 is provided with an anodized layer.

[0046] The working process of this invention is as follows: Place the mold sleeve 11 into the outer mold frame 12, and place the lower mold pad 32 into the mold sleeve 11; place the mold shaft 3 into the mold sleeve 11 and mate it with the lower mold pad 32; before filling the powder, apply force around the lower mold pad 32 with a rod-shaped tool to make the lower mold pad 32 flat; embed a limiting funnel above the mold shaft 3 and the mold sleeve 11, the inner diameter of which mates with the mold shaft 3 and the outer diameter with the mold sleeve 11, to ensure that the mold shaft 3 and the mold pad are not misaligned during powder filling; fill the mold cavity with powder, and during the powder filling process, a vibration device can be used to further increase the density of the powder in the cavity; place the upper mold pad 31 into the mold sleeve 11, and then put the mold cap 2 on top of the mold sleeve 11, gently squeezing the top of the mold cap 2 to expel the air inside; lock the two hose clamps outside the mold cap 2; send the assembled mold into a cold isostatic pressing device for cold isostatic pressing.

[0047] In summary, the embodiments of the present invention provide a cold isostatic pressing mold, the cavity of which can accommodate the mold shaft 3, so that the mold cavity 100 formed by the mold shaft 3, the mold pad, and the forming unit 1 can hold the raw material, which is beneficial for the present invention to press the raw material into a target blank through the cold isostatic pressing process; the upper and lower ends of the mold shaft 3 are respectively limited in the cavity by the mold pad, which can help stabilize the posture of the mold shaft 3 in the cavity and prevent the target blank from being eccentric after forming; the forming unit 1 has an opening that is relatively closed to the cavity, which facilitates the smooth entry of hydraulic oil, can improve the uniformity of the stress on the raw material during the cold isostatic pressing process, make the density distribution of the target material uniform after the cold isostatic pressing process, and is beneficial for the present invention to have uniform shrinkage in all directions during sintering.

[0048] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A cold isostatic pressing die, characterized in that, The device includes a molding unit, a mold cap, and a mold shaft. The molding unit includes a mold sleeve and an outer mold frame. The mold sleeve includes a sleeve body and a flange. The sleeve body has an open receiving cavity. The outer mold frame is fitted onto the outer side wall of the receiving cavity and has an opening. The flange is located outside the opening and forms an installation cavity with the sleeve body. The end of the outer mold frame extends into the installation cavity. The opening and the receiving cavity are relatively closed. The cross-sectional area of ​​the mold shaft gradually decreases from top to bottom. The upper and lower ends of the mold shaft are respectively limited in the receiving cavity by mold pads to stabilize the posture of the mold shaft within the receiving cavity. The mold shaft, the mold pads, and the molding unit form a mold cavity. The mold cap seals the opening and is detachably connected to the molding unit. The edge of the mold cap has a downwardly extending mounting portion, which is connected to the flange by a hose clamp.

2. The cold isostatic pressing mold according to claim 1, characterized in that, The outer mold frame is provided with handles on both opposite sides.

3. The cold isostatic pressing mold according to claim 1, characterized in that, The opening includes a first opening and a second opening, the first opening being located on the side wall of the outer mold frame, and the second opening being located on the bottom wall of the outer mold frame.

4. The cold isostatic pressing mold according to claim 1, characterized in that, The upper end of the mold shaft is provided with an upper mold pad, which has a first inclined surface. The lower end of the mold shaft is provided with a lower mold pad, which has a second inclined surface. The first inclined surface and the second inclined surface are arranged opposite to each other along the axial direction of the mold shaft.

5. The cold isostatic pressing die according to claim 4, characterized in that, The first inclined surface extends upward from the inside to the outside, and the second inclined surface extends downward from the inside to the outside.

6. The cold isostatic pressing die according to any one of claims 1 to 5, characterized in that, The outer surface of the mold shaft is provided with an anodized layer.

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