Polytetrafluoroethylene isostatic pressing forming mold

Abstract

This utility model discloses a polytetrafluoroethylene (PTFE) isostatic pressing mold, relating to the field of mold technology with adjustable parts. The PTFE isostatic pressing mold includes a fixed base, with multiple mold bases bolted to the top of the fixed base, and a mold sleeve positioning structure located on the fixed base. The mold sleeve positioning structure includes two electric telescopic rods, a fixed plate, and a mounting plate. The fixed plate is fixedly connected to the top of the fixed base. When different sizes of molding mold sleeves need to be adapted, the operator only needs to pull the limiting rod out of the limiting groove and remove the screw to release the limiting of the mounting slide plate. The mounting slide plate can then slide out of the mounting groove of the mounting plate, allowing for quick replacement of the mold positioning clamping plate that matches the new molding mold sleeve. This eliminates the need to replace the entire clamping assembly, significantly simplifying the operation process for switching between different mold sleeve specifications and avoiding the cumbersome procedures caused by the overall disassembly of traditional structures.

Description

Technical Field

[0001] This utility model relates to the field of mold technology with adjustable parts, and in particular to a polytetrafluoroethylene isostatic pressing mold. Background Technology

[0002] Polytetrafluoroethylene (PTFE) is increasingly widely used in high-end fields such as aerospace, semiconductors, and precision chemicals due to its excellent chemical stability, resistance to high and low temperatures, and superior dielectric properties. Isostatic pressing, as the core molding process for PTFE products, effectively avoids density inconsistencies during powder molding by applying uniform pressure to an elastic molding sleeve within the mold, thus ensuring the mechanical properties and dimensional accuracy of the finished product. In this process, the molding sleeve must form a stable, sealed fit with the mold base, and the clamping structure, as a key component connecting the molding sleeve and the base, directly determines the molding efficiency and product quality based on its adaptability and reliability.

[0003] Currently, the clamping structure of polytetrafluoroethylene (PTFE) is mostly a fixed and non-adjustable design. With the surge in market demand for personalized PTFE products, the same production line needs to frequently switch between molding sleeves with different diameters, heights, or cross-sectional shapes. This requires disassembling and replacing the entire clamping assembly, which not only requires recalibrating the coaxiality and parallelism between the clamping structure and the base, but also replacing suitable clamping bolts, positioning blocks, and other accessories. The operation process is complex and seriously restricts the continuous operation efficiency of the production line. Therefore, we propose a new PTFE isostatic pressing mold. Utility Model Content

[0004] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide a polytetrafluoroethylene (PTFE) isostatic pressing mold. This solution addresses the issue that the clamping structure of current PTFE isostatic pressing molds is mostly a fixed and non-adjustable design. With the surge in market demand for personalized PTFE products, the same production line needs to frequently switch between molding mold sleeves with different diameters, heights, or cross-sectional shapes. In such cases, the entire clamping assembly needs to be disassembled and replaced. This requires not only recalibrating the coaxiality and parallelism between the clamping structure and the base, but also replacing suitable clamping bolts, positioning blocks, and other accessories. The operation process is complex and seriously restricts the continuous operation efficiency of the production line.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a polytetrafluoroethylene isostatic pressing mold, comprising: A fixed base, with multiple mold bases bolted to the top of the fixed base; A mold positioning structure is located on a fixed base. The mold positioning structure includes two electric telescopic rods, a fixed plate, and a mounting plate. The fixed plate is fixedly connected to the top of the fixed base. Both electric telescopic rods are fixedly installed on one side of the fixed plate. The telescopic ends of both electric telescopic rods slide through the fixed plate and are fixedly connected to the mounting plate. The top of the mounting plate has multiple mounting grooves. The inside of the mounting plate has a through hole II. The inside of the through hole II has two positioning grooves. The top of the mounting plate has a limiting groove, which communicates with the inside of the through hole II. The inner wall of the limiting groove has multiple annular grooves. The inside of each of the multiple mounting grooves is slidably connected to a mounting slide plate. The side of each of the multiple mounting slide plates away from the mounting plate is fixedly connected to a mold positioning clamp. The side of each of the multiple mounting slide plates has a through hole I.

[0006] Preferably, the mold positioning structure further includes a screw, two positioning blocks, and a limiting rod. The screw is slidably connected inside the second through hole, and the screw is slidably connected to the interior of multiple first through holes. The two positioning blocks are fixedly connected to the outer surface of the screw, and the two positioning blocks are slidably connected to the interior of the corresponding positioning groove. An insertion hole is provided on the outer surface of the screw. The limiting rod is slidably connected inside the limiting groove, and the bottom end of the limiting rod is inserted into the interior of the insertion hole. Multiple rubber rings are fixedly sleeved on the outer surface of the limiting rod, and the multiple rubber rings are interference-fitted with the interior of the corresponding annular groove.

[0007] Preferably, there are two mold positioning structures, which are symmetrically arranged on the top of the fixed base.

[0008] Preferably, the mold positioning clamp is internally fixed with a rubber pad.

[0009] Preferably, a molding sleeve is placed on the top of the fixed base, and the molding sleeve is fitted onto the outside of the corresponding mold base.

[0010] Preferably, both the mounting groove and the mounting slide plate are convex structures.

[0011] Preferably, a control panel is fixedly installed on one side of the fixed base.

[0012] Preferably, the fixed base has a "C" shaped structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. When this polytetrafluoroethylene isostatic pressing mold needs to be adapted to mold sleeves of different sizes, the operator only needs to pull the limiting rod out of the limiting groove and remove the screw to release the limiting of the mounting slide plate. The mounting slide plate can then be slid out of the mounting groove of the mounting plate, and the mold positioning clamping plate that is compatible with the new mold sleeve can be quickly replaced without replacing the entire clamping assembly. This greatly simplifies the operation process of switching between mold sleeves of different specifications and avoids the cumbersome procedures caused by the overall disassembly of traditional structures. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the fixed base of this utility model; Figure 3 This is a schematic diagram of the mounting slide structure of this utility model; Figure 4 This is a schematic cross-sectional view of the mounting plate of this utility model.

[0015] Reference numerals: 1. Fixed base; 2. Control panel; 3. Electric telescopic rod; 4. Fixed plate; 5. Mounting plate; 6. Mold base; 7. Mold positioning clamp; 8. Rubber pad; 9. Mounting slide plate; 10. Mounting slide groove; 11. Through hole one; 12. Screw; 13. Limiting rod; 14. Through hole two; 15. Positioning groove; 16. Positioning block; 17. Insertion hole; 18. Limiting groove; 19. Rubber ring; 20. Annular groove; 21. Forming mold sleeve. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 limitations on this utility model.

[0018] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0020] Fixed base 1: The whole is a "C" shaped structure, which serves as the basic load-bearing component of the equipment and provides an installation and support platform for all structures; multiple mold bases 6 are bolted to its top, a control panel 2 is fixedly installed on one side, and a forming mold sleeve 21 is placed on the top, which also supports two symmetrically arranged mold sleeve positioning structures to ensure the overall stable operation of the equipment; Control panel 2: Fixedly installed on one side of the fixed base 1, used to control the extension and retraction of the electric telescopic rod 3, and to control the movement of the mounting plate 5 and the mold positioning clamp 7. It is the control core of the equipment. Electric telescopic rod 3: There are two of them, both of which are fixedly installed on one side of the fixed plate 4. The telescopic end slides through the fixed plate 4 and is fixedly connected to the mounting plate 5. Under the control of the control panel 2, it extends or retracts, which can drive the mounting plate 5 to move towards or away from the forming mold sleeve 21, providing power for the mold positioning clamping plate 7 to clamp the forming mold sleeve 21. Fixed plate 4: It is fixedly connected to the top of the fixed base 1 and serves as the mounting carrier for the electric telescopic pole 3. It provides stable installation support for the electric telescopic pole 3 and ensures the structural stability of the electric telescopic pole 3 during operation. Mounting plate 5: It is fixedly connected to the telescopic end of the electric telescopic rod 3, and has multiple mounting grooves 10 on the top, through holes 14 inside, and a limit groove 18 on the top; it is used to install the mounting slide plate 9, and moves synchronously with the telescopic rod 3 to drive the mold positioning clamping plate 7 to move closer to or away from the forming mold sleeve 21. Mold base 6: There are multiple mold bases, which are bolted to the top of the fixed base 1. They are used to place the polytetrafluoroethylene raw material pre-pressed blank and to allow the forming mold sleeve 21 to be fitted onto the outside of the mold base 6. They provide a positioning base for the forming mold sleeve 21 and ensure that the forming mold sleeve 21 is coaxially aligned with the mold base 6. Mold positioning clamp 7: It is fixedly connected to the side of the mounting slide plate 9 away from the mounting plate 5, and a rubber pad 8 is fixedly connected inside; it moves closer to the forming mold sleeve 21 under the action of the mounting plate 5, and can clamp and fix the forming mold sleeve 21 on the mold base 6. The rubber pad 8 can prevent damage to the outer wall of the forming mold sleeve 21 during clamping, and at the same time enhance the clamping friction. Rubber pad 8: It is fixedly connected inside the mold positioning clamping plate 7. When the mold positioning clamping plate 7 clamps the forming mold sleeve 21, it plays a buffering and protective role, preventing the outer wall of the forming mold sleeve 21 from being pinched and damaged, while improving the fit and clamping stability between the mold positioning clamping plate 7 and the forming mold sleeve 21. Mounting slide plate 9: There are multiple slide plates, all of which are slidably connected to the mounting slide groove 10 on the top of the mounting plate 5. A mold positioning clamping plate 7 is fixedly connected to the side away from the mounting plate 5, and a through hole 11 is opened on one side; it can drive the mold positioning clamping plate 7 to slide in the mounting slide groove 10, which makes it easy to replace different mold positioning clamping plates 7 according to the size of the forming mold sleeve 21. Mounting groove 10: There are multiple grooves, which are opened on the top of the mounting plate 5. They are convex structures that slide with the mounting slide plate 9. They provide a sliding track for the mounting slide plate 9, limit the sliding direction of the mounting slide plate 9, and ensure that the mounting slide plate 9 drives the mold positioning clamp 7 to move stably. Through hole 11: It is opened on one side of the mounting slide plate 9, allowing the screw 12 to slide through it; when the screw 12 passes through the through hole 11, it can limit the mounting slide plate 9 and prevent the mounting slide plate 9 from sliding freely in the mounting groove 10; Screw 12: It is slidably connected in the second through hole 14 of the mounting plate 5 and slidably connected to the first through hole 11 of multiple mounting slide plates 9. Two positioning blocks 16 are fixedly connected to its outer surface, and the outer surface is also provided with insertion holes 17. By passing through the second through hole 14 and the first through hole 11, and cooperating with the positioning blocks 16 and the positioning grooves 15, the mounting slide plate 9 is limited and fixed. When disassembling, it can slide out from the second through hole 14 and the first through hole 11 to release the limitation on the mounting slide plate 9. Limiting rod 13: It is slidably connected in the limiting groove 18 of the mounting plate 5, and multiple rubber rings 19 are fixedly sleeved on its outer surface. Its bottom end can be inserted into the insertion hole 17 of the screw 12. When inserted into the insertion hole 17, it can fix the position of the screw 12 and prevent the screw 12 from sliding in the through hole 14. When pulled out, it can release the fixation of the screw 12, making it easy to disassemble the screw 12. Through hole 2 14: It is opened inside the mounting plate 5 for the screw 12 to slide and connect. It also has two positioning grooves 15 inside; to provide installation and sliding space for the screw 12, and at the same time, through the positioning grooves 15 and the positioning block 16, it ensures the accurate positioning of the screw 12 during installation. Positioning groove 15: There are two of them, which are opened inside the second through hole 14 and are slidably connected to the positioning block 16 on the outer surface of the screw 12; they restrict the rotation of the screw 12 and ensure that the screw 12 can accurately pass through the first through hole 11 of multiple mounting slide plates 9, so as to effectively limit the mounting slide plate 9; Positioning blocks 16: There are two of them, both of which are fixedly connected to the outer surface of the screw 12 and are slidably connected to the positioning groove 15 in the through hole 2 14; they cooperate with the positioning groove 15 to prevent the screw 12 from rotating in the through hole 2 14 and ensure that the screw 12 is stably positioned to limit the installation slide plate 9; Insertion hole 17: It is formed on the outer surface of the screw 12 for the bottom end of the limiting rod 13 to be inserted; by cooperating with the limiting rod 13, the position of the screw 12 in the through hole 14 is fixed to prevent the screw 12 from shifting. Limiting groove 18: It is opened on the top of the mounting plate 5 and communicates with the inside of the through hole 14. Multiple annular grooves 20 are opened on the inner wall; it provides installation and sliding space for the limiting rod 13, and at the same time, the annular grooves 20 cooperate with the rubber ring 19 to enhance the stability of the limiting rod 13 after insertion. Rubber rings 19: There are multiple rubber rings, all of which are fixedly sleeved on the outer surface of the limiting rod 13 and are interference-fitted with the annular groove 20 on the inner wall of the limiting groove 18; they enhance the friction between the limiting rod 13 and the limiting groove 18, prevent the limiting rod 13 from sliding freely in the limiting groove 18, and ensure the fixing effect of the limiting rod 13 on the screw 12. Annular groove 20: There are multiple annular grooves, which are formed on the inner wall of the limiting groove 18 and are interference fit with the rubber ring 19 of the limiting rod 13; they provide an installation groove for the rubber ring 19 and improve the installation stability of the limiting rod 13 through the cooperation with the rubber ring 19. Molding sleeve 21: Placed on top of fixed base 1 and sleeved on the outside of corresponding mold base 6; cooperates with mold base 6 to form the basic molding space for subsequent isostatic pressing, used to accommodate polytetrafluoroethylene raw material pre-pressed blank, and remains stable under the clamping of mold positioning clamp 7 to ensure smooth molding process.

[0021] Example 1: like Figure 1-4 As shown, in the isostatic pressing process of polytetrafluoroethylene, different products require molding die sleeves of different sizes, and the corresponding mold positioning clamp size also needs to be changed.

[0022] The connection between the mounting slide plate 9 and the mold positioning clamp 7 is set to a screw 12 connection. When it is necessary to replace the mold positioning clamp 7 of different sizes, the operator controls the electric telescopic rod 3 through the control panel 2 to move the mounting plate 5 to a suitable position for easy operation. Then, the screw 12 is removed, the original mold positioning clamp 7 and mounting slide plate 9 are removed, and the corresponding size mounting slide plate 9 and mold positioning clamp 7 are selected according to the markings. The mounting slide plate 9 is slid into the corresponding mounting groove 10, and finally the screw 12 is used to complete the installation. This can quickly adapt to the production needs of products of different sizes.

[0023] Example 2: like Figure 3 As shown, a rubber pad 8 is fixedly connected inside the mold positioning clamp 7. The rubber pad 8 is evenly and firmly attached to the surface of the mold positioning clamp 7 and the forming mold sleeve 21 by high-strength adhesive. The thickness of the rubber pad 8 is precisely designed according to the size and pressure requirements of the molded product to ensure that it can play a good buffering and protective role during the molding process. At the same time, the rubber pad 8 is made of rubber material with good elasticity, wear resistance and chemical corrosion resistance to adapt to the working environment of polytetrafluoroethylene isostatic pressing.

[0024] Furthermore, when using this device, the operator first places the polytetrafluoroethylene raw material pre-pressed blank on multiple mold bases 6 bolted to the top of the fixed base 1, and then fits the forming mold sleeve 21 onto the outside of the corresponding mold base 6, ensuring that the forming mold sleeve 21 is coaxially aligned with the mold base 6, providing a basic forming space for subsequent isostatic pressing. The operator controls the two electric telescopic rods 3 fixedly installed on one side of the fixed plate 4 to extend, and the two electric telescopic rods 3 will drive the mounting plate 5 to move towards the forming mold sleeve 21 until the mold positioning clamping plate 7 on the mounting plate 5 approaches the outer wall of the forming mold sleeve 21. By moving the two mounting plates 5 synchronously, it is easier to clamp and install the forming mold sleeve 21 on the mold base 6.

[0025] According to the actual size of the forming mold sleeve 21, the operator can first pull the limiting rod 13 out of the limiting groove 18, and then remove the screw 12 so that the screw 12 can slide out from the through hole 14 and the through hole 11 on the multiple mounting slide plates 9, thereby releasing the limitation on the mounting slide plate 9, so that the mounting slide plate 9 can slide out from the mounting slide groove 10, which facilitates the replacement of the mold positioning clamp 7. The mold positioning clamp 7 can be replaced according to the forming mold sleeve 21. The installation can be done by reversing the operation.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A polytetrafluoroethylene isostatic pressing mold, characterized in that, include: Fixed base (1), with multiple mold bases (6) bolted to the top of the fixed base (1); A mold positioning structure is located on a fixed base (1); The mold positioning structure includes two electric telescopic rods (3), a fixing plate (4) and a mounting plate (5). The fixing plate (4) is fixedly connected to the top of the fixing base (1). The two electric telescopic rods (3) are fixedly installed on one side of the fixing plate (4). The telescopic ends of the two electric telescopic rods (3) slide through the fixing plate (4) and are fixedly connected to the mounting plate (5). Multiple mounting grooves (10) are opened on the top of the mounting plate (5). A through hole II (14) is opened inside the mounting plate (5). Two positioning grooves (15) are opened inside the through hole II (14). Among them, the top of the mounting plate (5) is provided with a limiting groove (18), the limiting groove (18) is connected to the inside of the through hole two (14), the inner wall of the limiting groove (18) is provided with multiple annular grooves (20), the inside of multiple mounting slides (10) is slidably connected with mounting slides (9), the side of multiple mounting slides (9) away from the mounting plate (5) is fixedly connected with a mold positioning clamp (7), and the side of multiple mounting slides (9) is provided with a through hole one (11).

2. The polytetrafluoroethylene isostatic pressing mold according to claim 1, characterized in that: The mold positioning structure also includes a screw (12), two positioning blocks (16) and a limiting rod (13). The screw (12) is slidably connected inside the second through hole (14). The screw (12) is slidably connected inside the multiple first through holes (11). The two positioning blocks (16) are fixedly connected to the outer surface of the screw (12). The two positioning blocks (16) are slidably connected inside the corresponding positioning groove (15). Among them, the screw (12) has an insertion hole (17) on its outer surface, the limiting rod (13) is slidably connected to the inside of the limiting groove (18), the bottom end of the limiting rod (13) is inserted into the inside of the insertion hole (17), and multiple rubber rings (19) are fixedly sleeved on the outer surface of the limiting rod (13), and the multiple rubber rings (19) are all interference fit with the inside of the corresponding annular groove (20).

3. The polytetrafluoroethylene isostatic pressing mold according to claim 1, characterized in that: The number of the mold positioning structures is two, and the two mold positioning structures are symmetrically arranged on the top of the fixed base (1).

4. The polytetrafluoroethylene isostatic pressing mold according to claim 1, characterized in that: The mold positioning clamp (7) is internally fixed with a rubber pad (8).

5. The polytetrafluoroethylene isostatic pressing mold according to claim 1, characterized in that: A molding sleeve (21) is placed on the top of the fixed base (1), and the molding sleeve (21) is fitted onto the outside of the corresponding mold base (6).

6. The polytetrafluoroethylene isostatic pressing mold according to claim 1, characterized in that: Both the mounting groove (10) and the mounting slide plate (9) are convex structures.

7. The isostatic pressing mold for polytetrafluoroethylene according to claim 1, characterized in that: A control panel (2) is fixedly installed on one side of the fixed base (1).

8. The polytetrafluoroethylene isostatic pressing mold according to claim 1, characterized in that: The fixed base (1) has a "C" shaped structure.

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