Waterproof sealing press-fit die

Abstract

The utility model relates to a waterproof sealing press fit die which comprises an upper die, a middle die, a lower die and a forming plate arranged between the upper die and the lower die, the lower die is connected with the middle die, the middle die is connected with the upper die, a water injection hole is formed in the lower die, and a through hole connected with the water injection hole is formed in the middle die; the mold further comprises a rubber sleeve wrapping the forming plate, the rubber sleeve extrudes the forming plate under the action of water pressure so as to press materials in the forming plate, and the lower mold and the upper mold are each provided with a sealing part matched with the rubber sleeve so as to conduct waterproof sealing on the forming plate. The mold is suitable for pressing and shaping powdery materials under the action of water pressure and is waterproof.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to a waterproof sealing pressing mold. Background Art

[0002] The molding process of powder-shaped materials, such as polytetrafluoroethylene, mainly includes compression molding, isostatic molding, extrusion molding, push molding, calendering molding, impregnation molding, and secondary processing molding. At present, the industry mainly uses compression molding to press polytetrafluoroethylene. According to production needs, molding plates of different specifications are manufactured, and the materials are filled in the molding plates. The molding plates are pressed by water pressure to achieve the compaction of the materials, and then sintered at high temperature and cooled to obtain molded products. The main problem at present is that the molding plates are easy to seep water under the action of water pressure.

[0003] The prior art discloses: CN202020740704.3 discloses a mold for a waterproof seal, comprising an upper mold (1), a lower mold (2) and a middle mold (3), wherein the lower mold (2) is provided with a lower shaping protrusion (42) and a lower shaping groove (41) for shaping the product, the upper mold (1) is provided with an upper shaping groove (43) for shaping the product, the middle mold (3) is provided with a middle shaping protrusion (45) and a middle shaping groove (44) for shaping the product, the middle mold (3) is provided with a sliding protrusion (61), the lower mold (2) is provided with a sliding groove (51), and the sliding protrusion (61) is located in the sliding groove (51).

[0004] Although the prior art discloses a waterproof mold, it is not suitable for processing powdered materials. Utility Model Content

[0005] The technical problem solved by the utility model is to overcome the problems existing in the prior art and provide a waterproof and sealed pressing mold suitable for pressing and shaping powdered materials under the action of water pressure.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] Disclosed is a waterproof sealing pressing mold, comprising an upper mold, a middle mold, a lower mold, and a molding plate arranged between the upper mold and the lower mold, the lower mold is connected to the middle mold, the middle mold is connected to the upper mold, the lower mold is provided with a water injection hole, and the middle mold is provided with a through hole connected to the water injection hole; the mold also includes a rubber sleeve wrapping the molding plate, the rubber sleeve squeezes the molding plate under the action of water pressure to press the material in the molding plate, and the lower mold and the upper mold are both provided with a sealing part that cooperates with the rubber sleeve to waterproof and seal the molding plate.

[0008] Preferably, the forming plate is provided with a groove for placing materials.

[0009] Preferably, the forming plate is made of corrosion-resistant steel.

[0010] Preferably, the rubber sleeve comprises a cylindrical body adapted to the through hole, and a first lip and a second lip arranged at two ends of the cylindrical body along the circumferential direction of the cylindrical body.

[0011] Preferably, the first lip is arranged between the upper mold and the forming plate, and the second lip is arranged between the lower mold and the forming plate.

[0012] Preferably, the length of the first lip is shorter than the length of the second lip.

[0013] Preferably, the lower mold and the middle mold are connected by a first bolt, and the upper mold and the middle mold are connected by a second bolt.

[0014] Preferably, the number of the first bolts is two.

[0015] Preferably, the number of the second bolts is two.

[0016] Preferably, the sealing portion is an O-ring.

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

[0018] 1) In the water injection state, the easy deformation of the rubber sleeve is utilized to realize the pressing and shaping of the powdered material. The rubber sleeve itself has a prevention function. A sealing part is arranged at the port where the rubber sleeve contacts the upper die or the lower die, thereby effectively preventing water from penetrating into the material.

[0019] 2) The rubber sleeve wraps the material in the forming plate, and the powdery material will not float away.

[0020] 3) Water pressure is used for pressing, and the pressing efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a waterproof sealing pressing mold of the utility model;

[0022] Figure 2 This is an exploded view of a waterproof sealing pressing mold of the utility model;

[0023] Figure 3 The utility model is a schematic diagram of the structure of a rubber sleeve in a waterproof sealing pressing mold. DETAILED DESCRIPTION

[0024] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0026] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0029] Example 1

[0030] like Figures 1 to 3As shown, a waterproof sealing pressing mold is disclosed, including an upper mold 1, a middle mold 2, a lower mold 3, and a molding plate 4 arranged between the upper mold 1 and the lower mold 3, the lower mold 3 is connected to the middle mold 2, the middle mold 2 is connected to the upper mold 1, the lower mold 3 is provided with a water injection hole 5, and the middle mold 2 is provided with a through hole 6 connected to the water injection hole 5; the mold also includes a rubber sleeve 7 wrapping the molding plate 4, the rubber sleeve 7 squeezes the molding plate 4 under the action of water pressure to press the material in the molding plate 4, and the lower mold 3 and the upper mold 1 are both provided with a sealing part 8 that cooperates with the rubber sleeve 7 to waterproof and seal the molding plate 4.

[0031] In this embodiment, the upper mold 1, the middle mold 2 and the lower mold 3 constitute the main frame of the pressing mold, the lower mold 3 is detachably connected to the middle mold 2, and the middle mold 2 is detachably connected to the upper mold 1. Powdered materials, such as polytetrafluoroethylene, are placed in the molding plate 4, and the position of the materials in the molding plate 4 is fixed by the rubber sleeve 7 wrapped around the molding plate 4. The rubber sleeve 7 is fixed by the upper mold 1 and the lower mold 3. A water injection hole 5 is provided on the lower mold 3, and a through hole 6 connected to the water injection hole 5 is provided on the middle mold 2. The external water source enters the through hole 6 through the water injection hole 5. As the amount of water injection increases, the water pressure in the mold will also rise. The surface of the rubber sleeve 7 in contact with water will squeeze the molding plate 4 under the action of the water pressure, thereby pressing the flow in the molding plate 4. The surface of the rubber sleeve 7 in contact with water specifically includes the contact surface located at the bottom of the middle mold 2 and the top of the lower mold 3, the contact surface at the top of the middle mold 2 and the bottom of the upper mold 1, and the contact surface in the through hole 6. That is, under the action of water pressure, the rubber sleeve 7 is deformed at three positions in total, that is, each time water is injected and pressurized, the rubber sleeve 7 can squeeze the forming plate 4 at three positions. At the same time, the lower mold 3 and the upper mold 1 are provided with a sealing part 8 that cooperates with the rubber sleeve 7 to waterproof the forming plate 4. The sealing part 8 prevents water from seeping out, and has a waterproof sealing effect.

[0032] Example 2

[0033] Disclosed is a waterproof sealing pressing mold, comprising an upper mold 1, a middle mold 2, a lower mold 3, and a molding plate 4 arranged between the upper mold 1 and the lower mold 3, the lower mold 3 is connected to the middle mold 2, the middle mold 2 is connected to the upper mold 1, the lower mold 3 is provided with a water injection hole 5, and the middle mold 2 is provided with a through hole 6 connected to the water injection hole 5; the mold also includes a rubber sleeve 7 wrapping the molding plate 4, the rubber sleeve 7 squeezes the molding plate 4 under the action of water pressure to press the material in the molding plate 4, and the lower mold 3 and the upper mold 1 are both provided with a sealing part 8 that cooperates with the rubber sleeve 7 to waterproof and seal the molding plate 4.

[0034] The difference between this embodiment and the first embodiment is that a groove for placing materials is provided on the forming plate 4. The powdered materials are placed in the groove, and the forming plate 4 is wrapped by the rubber sleeve 7, so as to prevent the materials from scattering from the forming plate 4.

[0035] When corrosive materials are pressed together, in order to prevent the forming plate from being corroded, the forming plate 4 can be made of corrosion-resistant steel.

[0036] Example 3

[0037] Disclosed is a waterproof sealing pressing mold, comprising an upper mold 1, a middle mold 2, a lower mold 3, and a molding plate 4 arranged between the upper mold 1 and the lower mold 3, the lower mold 3 is connected to the middle mold 2, the middle mold 2 is connected to the upper mold 1, the lower mold 3 is provided with a water injection hole 5, and the middle mold 2 is provided with a through hole 6 connected to the water injection hole 5; the mold also includes a rubber sleeve 7 wrapping the molding plate 4, the rubber sleeve 7 squeezes the molding plate 4 under the action of water pressure to press the material in the molding plate 4, and the lower mold 3 and the upper mold 1 are both provided with a sealing part 8 that cooperates with the rubber sleeve 7 to waterproof and seal the molding plate 4.

[0038] The difference between this embodiment and the first embodiment is that the forming plate 4 is block-shaped, a boss is provided at the center thereof, a conducting hole is provided at the center of the boss, and the boss can cooperate with the through hole on the middle mold.

[0039] The rubber sleeve 7 includes a cylindrical body adapted to the through hole, and a first lip and a second lip arranged at both ends of the cylindrical body along the circumferential direction of the cylindrical body. By utilizing the elasticity of the rubber, the rubber sleeve 7 wraps the forming plate 4, specifically wraps the conducting hole of the forming plate 4, and the first lip and the second lip. The first lip and the second lip wrap the top and the bottom of the forming plate 4 respectively.

[0040] The first lip and the second lip are specifically annular rings. After the mold is assembled, the boss on the molding plate 4 is placed in the through hole 6, the first lip is arranged between the upper mold 1 and the molding plate 4, and the second lip is arranged between the lower mold 3 and the molding plate 4. The length of the first lip is less than the length of the second lip.

[0041] Example 4

[0042] Disclosed is a waterproof sealing pressing mold, comprising an upper mold 1, a middle mold 2, a lower mold 3, and a molding plate 4 arranged between the upper mold 1 and the lower mold 3, the lower mold 3 is connected to the middle mold 2, the middle mold 2 is connected to the upper mold 1, the lower mold 3 is provided with a water injection hole 5, and the middle mold 2 is provided with a through hole 6 connected to the water injection hole 5; the mold also includes a rubber sleeve 7 wrapping the molding plate 4, the rubber sleeve 7 squeezes the molding plate 4 under the action of water pressure to press the material in the molding plate 4, and the lower mold 3 and the upper mold 1 are both provided with a sealing part 8 that cooperates with the rubber sleeve 7 to waterproof and seal the molding plate 4.

[0043] The difference between this embodiment and the above embodiment is that the lower mold 3 and the middle mold 2 are connected by a first bolt 9, and the upper mold 1 and the middle mold 2 are connected by a second bolt 10. There are two first bolts 9 and two second bolts 10. The upper mold 1, the middle mold 2 and the lower mold 3 are fixed by the first bolt 9 and the second bolt 10.

[0044] The sealing portion 8 may specifically be an O-type sealing ring. The O-type sealing ring is an existing product in the industry, and its structure is not described in detail here.

[0045] PTFE preforming is to add PTFE powder evenly into the mold and press it into a dense preform (i.e. blank) at room temperature; sintering is to heat the preform to above the melting point, and cooling is the process of cooling from the sintering temperature to room temperature. Some PTFE is formed by pressing once above the melting point. This kind of molding mold is called a hot pressing mold, and the corresponding PTFE mold is called a cold pressing mold. When molding PTFE, attention should be paid to the effects of compression ratio (generally PTFE is 4-6) and molding shrinkage (generally PTFE is 2.6-4.5%) on the product. The raw material is preferably polymerized resin by suspension method, and soft fine powder with a particle size of 20-500 microns is best. "Deflation" must be required during the pressing process, and the preforming pressure is 17-35 MPa. The holding time depends on the thickness of the blank. For example, a 100 mm thick blank should be held for 15 minutes.

[0046] During sintering, attention should be paid to the following: the heating rate can be 20-120℃ / hour. The larger the product, the slower the heating rate. The sintering temperature of polytetrafluoroethylene suspension resin is higher, 370-380℃, while the sintering temperature of dispersion resin is lower, 360-370℃. The higher the sintering temperature, the greater the shrinkage and porosity. The sintering time should be properly controlled. For cooling, slow cooling is generally used at a rate of 15-25℃ / hour. In special cases, such as a few thin plates with a thickness of less than 5 mm or thin-walled tubes formed by push molding, rapid cooling is used. Sometimes polytetrafluoroethylene products are annealed at 100-120℃ for 4-6 hours.

[0047] The specific production process includes the following steps:

[0048] Step 1: Mould selection: Choose a mould made of qualified steel as the mould for moulding; make the leather cover matching the parts;

[0049] Step 2: Material preparation: Prepare the materials required for the PTFE molding process, including PTFE powder, molding plates, etc.

[0050] Step 3: Powder filling: Fill the material prepared in step 2 into the steel mold selected in step 1;

[0051] Step 4: Pre-forming: First, compact the powder by hand, and then pre-form it mechanically through the full mold through bolts;

[0052] Step 5: Pressing and forming: injecting water into the mold filled with powder, and then pressing and forming;

[0053] Step 6: Sintering: After adding the protective mold, send it into the sintering furnace for high-temperature firing; and perform low-temperature annealing;

[0054] Step 7: Dimension inspection: inspect the dimensions of the finished product that has been pressed and demoulded in step 6, and compare it with the finished product dimension qualification table to screen out unqualified products;

[0055] Step 8: Machining: Select qualified products from step 8 and perform fine machining, trim the edges and corners, and remove machining allowances;

[0056] Step 9: Packing and warehousing: Pack the trimmed products and put them into warehouse.

[0057] As a further solution of the utility model: in step one, the mold should be specially customized according to the size of the part to be prepared; a series of special molds can be prefabricated according to the product specification sequence; so that it can be used at any time to avoid temporary production.

[0058] As a further solution of the utility model: in step three, when filling the powder, a material distributor is used to evenly fill the powder inside the steel mold.

[0059] As a further solution of the utility model: in step 5, the pressure during the pressing and forming is 1MPa-7MPa, which can be done by a hydraulic press, an isobaric autoclave, etc.

[0060] As a further solution of the utility model: in step eight, the grinding is performed by sandpaper. Edge trimming is to use sandpaper to chamfer the edges and corners of the product and repair burrs.

[0061] The mold of this innovation is divided into several parts, such as lower mold, middle mold, upper mold, leather cover, seal, etc. They are combined into one by bolts, as shown in the attached figure for details.

[0062] The upper die, middle die and lower die are combined into one by fasteners, the leather cover wrapped with the anti-corrosion part is placed in the middle, and the powder is filled manually, and then pressurized and sintered.

[0063] Obviously, the above embodiments are merely examples for clearly illustrating the technical solution of the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A waterproof sealing pressing mold, characterized in that: The invention comprises an upper die, a middle die, a lower die, and a molding plate arranged between the upper die and the lower die, wherein the lower die is connected to the middle die, the middle die is connected to the upper die, the lower die is provided with a water injection hole, and the middle die is provided with a through hole connected to the water injection hole; the mold further comprises a rubber sleeve wrapping the molding plate, the rubber sleeve extrude the molding plate under the action of water pressure so as to press the material in the molding plate, and the lower die and the upper die are both provided with a sealing part cooperating with the rubber sleeve to waterproof and seal the molding plate.

2. A waterproof sealing pressing mold according to claim 1, characterized in that: The forming plate is provided with a groove for placing materials.

3. A waterproof sealing pressing mold according to claim 1, characterized in that: The formed plate is made of corrosion-resistant steel.

4. The waterproof sealing pressing mold according to claim 1, characterized in that: The rubber sleeve comprises a cylindrical body adapted to the through hole, and a first lip edge and a second lip edge arranged at two ends of the cylindrical body along the circumferential direction of the cylindrical body.

5. The waterproof sealing pressing mold according to claim 4, characterized in that: The first lip edge is arranged between the upper mold and the forming plate, and the second lip edge is arranged between the lower mold and the forming plate.

6. The waterproof sealing pressing mold according to claim 4, characterized in that: The length of the first lip is shorter than the length of the second lip.

7. The waterproof sealing pressing mold according to claim 1, characterized in that: The lower die and the middle die are connected by first bolts, and the upper die and the middle die are connected by second bolts.

8. The waterproof sealing pressing mold according to claim 7, characterized in that: The number of the first bolts is two.

9. The waterproof sealing pressing mold according to claim 7, characterized in that: The number of the second bolts is two.

10. The waterproof sealing pressing mold according to claim 1, characterized in that: The sealing portion is an O-shaped sealing ring.

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