Cold isostatic pressing forming device suitable for L-shaped barrel

Abstract

The utility model discloses a cold isostatic pressing forming device suitable for an L-shaped barrel, which comprises a base, a core rod is arranged on the base, the cold isostatic pressing forming device further comprises a forming sleeve, one end of the forming sleeve is sleeved on the base, the other end of the forming sleeve is connected with a forming cover, and the base, the forming sleeve and the forming upper cover form a forming cavity. According to the forming device, in the forming process of an L-shaped barrel and similar products, the forming body green body can be prevented from cracking, water can be prevented from entering the mold, the defective rate is reduced, and meanwhile the forming device is simple in structure and low in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ceramic processing forming, especially to a cold isostatic pressing forming device suitable for L-shaped barrel. BACKGROUND

[0002] With the wide application of ceramic materials, more and more products are designed to be ceramic materials, and the structure and size of ceramic products are more diversified, and the requirements for ceramic products are also higher and higher. The Vickers hardness of special ceramic applied in various products reaches 18GPa, it is difficult to use a cutter to grind the special ceramic product, the cost is high, and high-precision equipment and jigs are needed for clamping.

[0003] Cold isostatic pressing forming technology is a common technology in ceramic forming process at present, which has the advantages of simple operation, stable quality, and uniform forming body. The isostatic pressing process on the market can only form solid cylinder materials, and when forming L-shaped material structure with a step structure, problems such as forming body fracture and mold water ingress are prone to occur. For example, the utility model with the announcement number CN214920490U discloses a cold isostatic pressing mold, which comprises: a rubber sleeve outer mold, two cover plates buckled on the upper and lower openings of the rubber sleeve outer mold, and an inner mold located inside the rubber sleeve outer mold and fixed to the cover plates. Wherein, the rubber sleeve outer mold is integrally formed, and the rubber sleeve outer mold and the cover plates and the inner mold form a cavity. This technical solution can enlarge the compression ratio and reserve the machining allowance, calculate the size of the special rubber sleeve, and apply the rubber sleeve of this size to the corresponding product mold for integral forming. However, for L-shaped barrel products with a step, the above technical solution is prone to problems such as fracture of the forming body and water ingress of the mold during the forming process. UTILITY MODEL CONTENTS

[0004] In order to overcome the problem that the cold isostatic pressing mold in the prior art is prone to forming body fracture and mold water ingress when producing L-shaped barrel products with a step, the utility model provides a cold isostatic pressing forming device suitable for L-shaped barrel, which can prevent the problems of forming body fracture and mold water ingress during the raw material forming process, and reduce the rate of defective products.

[0005] To achieve the above technical purposes, the utility model provides:

[0006] The utility model provides a kind of be suitable for L-shaped barrel cold isostatic pressing forming device, including base, the base is equipped with mandrel, further including forming sleeve, the forming sleeve one end sleeve joint in the base, the other end is connected forming cover, the base, the forming sleeve and the forming upper cover form forming cavity.The forming sleeve one end sleeve joint in the base, the forming sleeve other end is connected with forming cover, mandrel is equipped on the base, and the mandrel is located inside forming sleeve;The space formed by the base, the forming sleeve, the forming cover is forming cavity, and raw material is filled in the inside of the forming cavity, and forming body is formed by cold isostatic pressing process.

[0007] The base is disc-shaped, and the base circumferential side is provided with a sleeve joint step, and the forming sleeve is sleeved on the sleeve joint step.The base is provided with a sleeve joint step, and the forming sleeve is sleeved on the sleeve joint step and is in interference fit.

[0008] The mandrel is conical, the larger-diameter end of the mandrel is connected to the base, the smaller-diameter end of the mandrel is connected to a hole forming rod, the connection between the mandrel and the base is smoothly transitioned, and the connection between the mandrel and the hole forming rod is smoothly transitioned.The other end of the hole forming rod connected to the mandrel abuts against the forming cover.

[0009] The forming sleeve includes a cylindrical segment and a circular table segment, the circular table segment is hollow in the middle, the first cylindrical segment is connected to the smaller-diameter end of the circular table segment, and the second cylindrical segment is connected to the larger-diameter end of the circular table segment.The middle of the forming sleeve is a circular table segment, the circular table segment is hollow in the middle, the smaller-diameter end of the circular table segment is connected to a first cylindrical segment, and the larger-diameter end of the circular table segment is connected to a second cylindrical segment.

[0010] An R angle is arranged at the connection between the cylindrical segment and the circular table segment.An R angle is arranged at the connection between the first cylindrical segment and the circular table segment, and an R angle is arranged at the connection between the second cylindrical segment and the circular table segment, so that the connection between the parts of the forming sleeve is smoothly transitioned, the inside corner of the forming sleeve is smoothly transitioned, and the stress of the forming body is evenly distributed.

[0011] The forming cover is cylindrical, the outer diameter of the forming cover is equal to the outer diameter of the first cylindrical segment, the first cylindrical segment is provided with a sealing ring, one end face of the forming cover is provided with a sealing groove, and the sealing ring and the sealing groove are matched.The sealing ring and the sealing groove are matched to improve the sealing performance between the forming cover and the forming sleeve, so as to avoid the problem of water leakage in the mold.

[0012] The base is made of metal.

[0013] The forming sleeve is made of rubber, the forming cover is made of rubber, and the rubber used in the forming sleeve and the forming cover has a Shore hardness ranging from 60 to 90 HA.

[0014] The thickness of the forming sleeve is 8-10mm.

[0015] The utility model has the advantages of:

[0016] 1. The utility model can avoid the fracture of the forming body in the cold isostatic pressing forming process of the L-shaped bucket product and the water inlet problem of the mold, and reduces the defective rate.

[0017] 2. The utility model has simple structure and low manufacturing cost, and can be reused. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic diagram of L-shaped bucket cold isostatic pressing forming device.

[0019] Figure 2 It is the overall structure section view of L-shaped bucket cold isostatic pressing forming device in embodiment one.

[0020] Figure 3 It is the structure schematic diagram of base.

[0021] Figure 4 It is the structure schematic diagram of forming cover.

[0022] Figure 5 It is the overall structure section view of L-shaped bucket cold isostatic pressing forming device in embodiment two.

[0023] Figure 6 It is the section view of core rod sleeve in embodiment three.

[0024] Reference numerals:

[0025] 1. base, 2. forming sleeve, 3. forming cover, 4. forming cavity, 5. sleeve, 11. sleeve joint step, 12. core rod, 13. second sealing groove, 21. first cylinder section, 22. second cylinder section, 23. circular table section, 24. sealing ring, 25. second sealing ring, 31. sealing groove, 121. hole forming rod. DETAILED DESCRIPTION

[0026] The following specific embodiments illustrate the embodiments of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the disclosed content of the specification.

[0027] The utility model provides a kind of L-shaped bucket cold isostatic pressing forming device suitable for, the following preferred embodiment of L-shaped bucket cold isostatic pressing forming device is described.

[0028] Implementation one

[0029] As Figure 1 And Figure 2As shown in the drawings, the L-shaped barrel cold isostatic pressing forming device comprises a base 1, a forming sleeve 2 sleeved on the base 1, and a forming cover 3 connected to the other end of the forming sleeve 2. Figure 3 As shown in the drawings, the base 1 is disc-shaped, and a core rod 12 is arranged on the base 1. A sleeving step 11 is arranged on the circumferential side of the base 1 close to the core rod 12. The forming sleeve 2 is sleeved on the sleeving step 11, and the forming sleeve 2 is in interference fit with the sleeving step 11. The core rod 12 is conical, and the end with a larger outer diameter is connected to the base 1, and the end with a smaller outer diameter is connected to a hole forming rod 121. The hole forming rod 121 is cylindrical. The connection between the core rod 12 and the base 1 and the connection between the core rod 12 and the hole forming rod 121 are both smoothly transitioned. The hole forming rod 121 can be added to abut against the forming cover 3, and a through hole can be directly processed at the bottom of the green body. The base 1 and the core rod 12 are integrally formed and are made of carbon steel, and the surface is chrome plated. The forming sleeve 2 is made of rubber material, and the Shore hardness is 90HA, and the thickness is 10mm. The forming sleeve 2 comprises a circular truncated cone segment 23 which is hollow in the middle and is circular truncated cone-shaped, and a cylindrical segment. The cylindrical segment comprises a first cylindrical segment 21 and a second cylindrical segment 22. The first cylindrical segment 21 is connected to the end with a smaller outer diameter of the circular truncated cone segment 23, and the connection is R-transitioned. The second cylindrical segment 22 is connected to the end with a larger outer diameter of the circular truncated cone segment 23, and the connection is R-transitioned. Figure 2 As shown in the drawings, the other end of the first cylindrical segment 21 connected to the circular truncated cone segment 23 is provided with a sealing ring 24. The sealing ring 24 is formed by extending outward from the inner surface of the first cylindrical segment 21, and the outer diameter size is smaller than the outer diameter size of the first cylindrical segment 21. Figure 4 As shown in the drawings, the forming cover 3 is cylindrical, and the outer diameter size is equal to the outer diameter size of the first cylindrical segment 21. The forming cover 3 is made of rubber material, and the Shore hardness is 90HA. A sealing groove 31 is arranged on one end surface of the forming cover 3, and the sealing groove 31 is correspondingly arranged with the sealing ring 24. The forming cover 3 is connected to the first cylindrical segment 21, and the sealing ring 24 is embedded in the sealing groove 31. The space surrounded by the upper surface of the base 1, the outer surface of the core rod 12, the outer surface of the hole forming rod 121, the inner surface of the forming sleeve 2, and the bottom surface of the forming cover 3 is the forming cavity 4. The forming cavity 4 is used to fill ceramic powder, and the ceramic powder is pressed and formed in the cold isostatic pressing forming process.

[0030] The use method of the L-shaped barrel cold isostatic pressing forming device is as follows.

[0031] The operator connects the base 1 with the forming sleeve 2, wherein the base 1 is integrally formed, made of carbon steel and plated with chromium on the surface, to ensure the strength and smoothness of the surface of the base 1, and the forming sleeve 2 is made of rubber, which is conducive to the uniform application of pressure by the liquid in the isostatic press to the forming sleeve 2, to ensure the uniform density and regular appearance of the delicate ceramic green body; the thickness of the forming sleeve 2 is 10 mm, and the Shore hardness is 90HA; the second cylindrical section 22 of the forming sleeve 2 is in interference fit with the sleeve joint step 11 of the base 1, to prevent water from entering the mold during cold isostatic pressing; the operator needs to clean the surface of the base 1 and the mandrel 11 before filling the material, to avoid large particles, and clean the lower surface of the forming cover 3 and the inner surface of the forming sleeve 2; the ceramic powder treated in advance is added from the opening of the first cylindrical section 21 of the forming sleeve 2, and the filling process is carried out to ensure that the powder filling bubbles are discharged; after the powder is added, the forming cover 3 is connected with the forming sleeve 2, wherein the forming cover 3 is made of rubber, the Shore hardness is 90HA, the sealing ring 24 is connected with the sealing groove 31, to prevent water from entering the mold during cold isostatic pressing; the gap between the forming cover 3 and the forming sleeve 2 and the gap between the forming sleeve 2 and the base 1 are sealed with adhesive tape, to further prevent water from entering the mold; the sealed L-shaped barrel cold isostatic pressing device is placed in a stainless steel cage and hoisted into an isostatic press for pressing, and the pressure range is 70-150Mpa; during the pressing process, the rubber forming sleeve 2 and the forming cover 3 are compressed smaller under the pressure transmission of the liquid, and the ceramic powder 7 is compressed into a ceramic green body with strength, wherein the two R-angles on the forming sleeve can prevent cracking caused by inconsistent shrinkage of the corners during the forming process, the interference fit between the forming sleeve 2 and the base 1 and the sealing of the adhesive tape prevent water from entering the mold, the cooperation of the sealing ring 24 and the sealing groove 31 and the sealing of the adhesive tape prevent water from entering the mold; after the pressing is completed, the ceramic green body is uniform in purpose, regular in appearance, and the corners of the formed body are not cracked.

[0032] Example Two

[0033] Based on the idea of preventing water from entering the forming device during isostatic pressing, the end of the second cylindrical section of the forming sleeve is added with the same structure as the sealing ring, i.e. a second sealing ring 25, and a second sealing groove 13 matched with the second sealing ring 25 is arranged on the larger disc on the outer diameter of the base, close to the annular surface of the sleeve joint step, i.e. the surface where the base contacts the end surface of the second cylindrical section.

[0034] As Figure 1 and Figure 5As shown, the L-shaped barrel cold isostatic pressing forming device comprises a base 1, a forming sleeve 2 sleeved on the base 1, and a forming cover 3 connected to the other end of the forming sleeve 2; the base 1 is disc-shaped, and a core rod 12 is arranged on the base 1; a sleeving step 11 is arranged on the circumferential side of the base 1 close to the core rod 12, and the forming sleeve 2 is sleeved on the sleeving step 11; the core rod 12 is conical, and the end with a larger outer diameter is connected to the base 1, and the end with a smaller outer diameter is connected to a hole forming rod 121; the hole forming rod 121 is cylindrical, and the connection between the core rod 12 and the base 1 and the connection between the core rod 12 and the hole forming rod 121 are both smoothly transitioned; the hole forming rod 121 can be added to abut against the forming cover 3, and a through hole can be directly processed at the bottom of the green body; the base 1 and the core rod 12 are integrally formed and are made of carbon steel, and the surface is chrome-plated; the forming sleeve 2 is made of rubber material, has a Shore hardness of 90HA, and has a thickness of 10mm; the forming sleeve 2 comprises a circular truncated cone segment 23 which is hollow in the middle and is in the shape of a circular truncated cone, and a cylindrical segment which further comprises a first cylindrical segment 21 and a second cylindrical segment 22; the first cylindrical segment 21 is connected to the end with a smaller outer diameter of the circular truncated cone segment 23, and the connection is R-transitioned; the second cylindrical segment 22 is connected to the end with a larger outer diameter of the circular truncated cone segment 23, and the connection is R-transitioned; as shown in the figure, Figure 2 the other end of the first cylindrical segment 21 connected to the circular truncated cone segment 23 is provided with a sealing ring 24 which is formed by extending outward from the inner surface of the first cylindrical segment 21 and has an outer diameter smaller than that of the first cylindrical segment 21; a second sealing ring 25 is arranged on the end face of the second cylindrical segment 22, and the structure of the second sealing ring 25 is the same as that of the sealing ring 24, which is formed by extending outward from the inner surface of the second cylindrical segment 22 and has an outer diameter smaller than that of the second cylindrical segment 22; as shown in the figure, Figure 4 the forming cover 3 is cylindrical, has an outer diameter equal to that of the first cylindrical segment 21, is made of rubber material, has a Shore hardness of 90HA, and is provided with a sealing groove 31 on one end face, which is arranged correspondingly to the sealing ring 24; the forming cover 3 is connected to the first cylindrical segment 21, and the sealing ring 24 is embedded in the sealing groove 31; a second sealing groove 13 is arranged correspondingly to the second sealing ring 25, and the second sealing ring 25 is embedded in the second sealing groove 13; a space surrounded by the upper surface of the base 1, the outer surface of the core rod 12, the outer surface of the hole forming rod 121, the inner surface of the forming sleeve 2, and the bottom surface of the forming cover 3 is the forming cavity 4, which is used for filling ceramic powder and pressing the ceramic powder into a shape during cold isostatic pressing.

[0035] The use method of the L-shaped barrel cold isostatic pressing forming device is as follows:

[0036] The operator connects the base 1 with the forming sleeve 2, wherein the base 1 is integrally formed, made of carbon steel and plated with chromium on the surface to ensure the strength and smoothness of the surface of the base 1, and the forming sleeve 2 is made of rubber, which is conducive to the uniform application of pressure by the liquid in the isostatic press to the forming sleeve 2, ensuring the uniform density and regular appearance of the ceramic green body; the thickness of the forming sleeve 2 is 10 mm, and the Shore hardness is 90HA; the second cylindrical section 22 of the forming sleeve 2 cooperates with the sleeve joint step 11 of the base 1 to prevent water from entering the mold during cold isostatic pressing; the operator needs to clean the surface of the base 1 and the mandrel 11 before filling the material, avoid large particles, clean the lower surface of the forming cover 3 and the inner surface of the forming sleeve 2; add the ceramic powder treated in advance to the opening of the first cylindrical section 21 of the forming sleeve 2, and try to ensure that the powder filling bubbles are discharged during this process; after the powder is added, the forming cover 3 is connected with the forming sleeve 2, wherein the forming cover 3 is made of rubber, the Shore hardness is 90HA, the sealing ring 24 is connected with the sealing groove 31 to prevent water from entering the mold during cold isostatic pressing; the gap between the forming cover 3 and the forming sleeve 2 and the gap between the forming sleeve 2 and the base 1 are sealed with adhesive tape to further prevent water from entering the mold; the sealed L-shaped barrel cold isostatic pressing device is placed in a stainless steel cage and hoisted into an isostatic press for pressing, and the pressure range is 70-150Mpa; during the pressing process, the rubber forming sleeve 2 and the forming cover 3 are compressed smaller by the liquid pressure transmission, and at the same time, the ceramic powder 7 is compressed into a ceramic green body with strength, wherein the two R angles on the forming sleeve can avoid cracking caused by inconsistent shrinkage of the corner part during the forming process, the cooperation of the second sealing ring 25 and the second sealing groove 13 and the sealing of the adhesive tape prevent water from entering the mold, and the cooperation of the sealing ring 24 and the sealing groove 31 and the sealing of the adhesive tape prevent water from entering the mold; after the pressing is completed, the ceramic green body is uniform in purpose, regular in appearance, and the corner of the formed body is not cracked.

[0037] Example three

[0038] The shape of the mandrel on the base can be changed according to the specific shape and size of the inner surface of the L-shaped barrel, and a sleeve 5 that cooperates with the mandrel can also be manufactured separately, which is suitable for isostatic pressing of large-size L-shaped barrels. Figure 6As shown, the sleeve 5 is in the shape of a hollow truncated cone, with a small end face opening, a hole forming rod passing through the hole, and a large end ring for forming a step opening of the green body opening, with a smooth surface tightly fitted with the mandrel or a certain gap. The outer surface of the sleeve 5 can be designed according to the actual shape of the inner surface of the green body. During the isostatic pressing process of the large size L-shaped barrel, the sleeve 5 can be replaced as needed, facilitating processing and reducing manufacturing costs. Before isostatic pressing, the surface of the mandrel is cleaned, the inner surface of the sleeve is cleaned, the sleeve is sleeved on the mandrel, the hole forming rod passes through the through hole at the bottom of the sleeve, and the sleeve and the mandrel are checked for no shaking. Then the operation steps in the above embodiment can be performed. The hole forming rod can be added to abut against the forming cover, and a through hole can be directly processed at the bottom of the green body.

[0039] In the utility model, the R angle design of the forming sleeve and the reinforcing and sealing design of the two ends of the forming sleeve can realize the cold isostatic pressing of the L-shaped barrel of ceramic material in the prior art, and the formed ceramic green body will not crack, the mold will not enter water during the forming process to cause the green body to be scrapped, the defective rate is reduced, and it is especially suitable for the forming and manufacturing of large size L-shaped barrel ceramic products; meanwhile, the forming device of the utility model has the advantages of simple structure, easy manufacturing, low cost and practical significance.

[0040] In addition to the above embodiments, within the scope disclosed in the claims and the specification of the utility model, the technical features of the utility model can be reselected and combined to form new embodiments, which can be realized by those skilled in the art without creative labor, therefore these embodiments not specifically described in the utility model should be regarded as specific embodiments of the utility model and within the protection scope of the utility model.

Claims

1. A cold isostatic pressing device for L-shaped barrels, characterized in that: The mold comprises a base with a core rod provided on the base, and a molding sleeve with one end sleeved on the base and the other end connected to a molding cover. The base, the molding sleeve and the molding cover form a molding cavity.

2. The cold isostatic pressing device for L-shaped barrels according to claim 1, characterized in that: The base is disc-shaped, and a sleeve step is provided on the circumferential side of the base, and the forming sleeve is sleeved on the sleeve step.

3. The cold isostatic pressing device for L-shaped barrels according to claim 2, characterized in that: The core rod is conical, the end with a larger outer diameter of the core rod is connected to the base, and the end with a smaller outer diameter of the core rod is connected to the hole forming rod. The connection between the core rod and the base is smoothly transitioned, and the connection between the core rod and the hole forming rod is smoothly transitioned.

4. The cold isostatic pressing device for L-shaped barrels according to claim 1, characterized in that: The forming sleeve includes a cylindrical section and a frustum section, the cylindrical section includes a first cylindrical section and a second cylindrical section, the frustum section is in the shape of a frustum with a hollow middle, the first cylindrical section is connected to the end of the frustum section with a smaller outer diameter, and the second cylindrical section is connected to the end of the frustum section with a larger outer diameter.

5. The cold isostatic pressing device for L-shaped barrels according to claim 4, characterized in that: An R angle is provided at the connection between the cylindrical section and the truncated cone section.

6. The cold isostatic pressing device for L-shaped barrels according to claim 4, characterized in that: The forming cover is cylindrical, and its outer diameter is equal to that of the first cylindrical section. The first cylindrical section is provided with a sealing ring. One end surface of the forming cover is provided with a sealing groove, and the sealing ring and the sealing groove cooperate with each other.

7. A cold isostatic pressing device for L-shaped barrels according to any one of claims 1 to 6, characterized in that: The base is made of metal material.

8. A cold isostatic pressing device for L-shaped barrels according to any one of claims 1 to 6, characterized in that: The molding sleeve is made of rubber, and the molding cover is made of rubber. The Shore hardness of the rubber used for the molding sleeve and the molding cover is in the range of 60 to 90 HA.

9. The cold isostatic pressing device for L-shaped barrels according to claim 8, characterized in that: The thickness of the forming sleeve ranges from 8 to 10 mm.

Images