Device for hot press molding

Abstract

The utility model belongs to the technical field of hot press molding, and particularly relates to a device for hot press molding, which comprises a preparation mechanism and a demolding mechanism, the preparation mechanism comprises an upper mold, an upper mold sleeve, a lower mold sleeve and a lower mold which are sequentially arranged from top to bottom, an upper bulge is arranged on the lower side of the upper mold, and a lower bulge is arranged on the upper side of the lower mold; a plurality of first exhaust holes are formed in the lower die sleeve in the circumferential direction, and second exhaust holes penetrating through the upper die and the lower die are formed in the upper protrusion and the lower protrusion correspondingly. The demolding mechanism comprises a demolding base plate and a demolding block, the upper end of the demolding base plate is arranged to be a step face matched with the end of the lower mold sleeve, the inner diameter of the demolding block is smaller than that of the lower mold sleeve, the mold supporting base plate is an annular block, and the demolding block is of a cylindrical structure. According to the utility model, the exhaust holes are formed in the upper die, the lower die and the lower die sleeve, so that raw materials are fully contacted and gas in the raw materials is extruded and exhausted during die pressing, and the quality of formed parts is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the hot press forming technical field, concretely relates to a device for hot press forming. BACKGROUND

[0002] Hot press forming is an important preparation method for producing heat protection parts such as heat insulation and heat insulation in the field of weapon industry, and the existing hot press forming technology is mainly composed of hot press forming machine and hot press die, although the technology application has been relatively mature, but still has many deficiencies.

[0003] In the process of producing parts by the existing mold pressing forming mode, the air in it cannot be discharged or discharged incompletely, resulting in defects such as air holes in the product. SUMMARY

[0004] The utility model discloses to solve the problem that the gas in the material cannot be discharged or discharged incompletely in the process of producing parts by the existing mold pressing forming, resulting in defects such as air holes in the product, and provides a device for hot press forming, which is provided with exhaust holes on the upper die, lower die and lower die sleeve, and the gas in the raw material is squeezed out during pressing, ensuring the quality of the formed parts.

[0005] In order to realize the above-mentioned purpose, the technical scheme of the utility model is:

[0006] A device for hot press forming, comprising a preparation mechanism and a demolding mechanism, the preparation mechanism comprises an upper die, an upper die sleeve, a lower die sleeve and a lower die arranged in sequence from top to bottom, an upper protrusion is fixedly arranged on the middle part of the side of the upper die facing the lower die, a lower protrusion is fixedly arranged on the middle part of the side of the lower die facing the upper die, there is a gap between the upper protrusion and the lower protrusion, a plurality of first exhaust holes are arranged on the lower die sleeve in a circumferential direction, second exhaust holes are arranged on the upper protrusion and the lower protrusion and penetrate the upper die and the lower die, the contact between the upper die and the lower die and the raw material and the pressure transmission are ensured by the upper protrusion and the lower protrusion, and the gas in the raw material is discharged through the exhaust holes.

[0007] The demolding mechanism comprises a demolding pad and a demolding block, the upper end of the demolding pad is provided with a stepped surface matched with the end part of the lower die sleeve, the inner diameter of the demolding block is smaller than the inner diameter of the lower die sleeve, the demolding pad is an annular block, and the demolding block is a cylindrical structure, the separation of the product and the lower die sleeve is realized through the demolding mechanism.

[0008] Preferably, an annular plate is fixedly arranged on the lower side of the upper die sleeve, the annular plate is sleeved on the upper end of the lower die sleeve, and the annular plate and the lower die sleeve are connected through bolt fastening, so as to ensure the axial and radial limiting fixation between the upper die sleeve and the lower die sleeve.

[0009] Preferably, the upper end of the upper die is fixedly provided with an annular block outside, a plurality of upper threaded holes are uniformly distributed on the annular block, the plurality of upper threaded holes are correspondingly arranged on the upper end surface of the upper die sleeve, a plurality of lower threaded holes are uniformly distributed on the upper end of the lower die, and the plurality of lower threaded holes are correspondingly arranged on the lower end surface of the lower die sleeve. After hot pressing forming, the bolt is screwed into the upper threaded hole and the lower threaded hole, and the bolt top is connected with the upper die sleeve and the lower die sleeve, so that the upper die and the lower die are separated from the product.

[0010] Preferably, the upper protrusion is smoothly connected with the lower side of the upper die and is integrally formed, and the lower protrusion is smoothly connected with the upper side of the lower die and is integrally formed.

[0011] Preferably, an upper groove is arranged in the middle of the upper die, a lower groove is arranged in the middle of the lower side of the lower die, and the upper groove and the lower groove are communicated with the corresponding second exhaust hole, thereby reducing the weight of the mold and reducing the cost.

[0012] Preferably, a groove is arranged at the top of the demolding block, thereby reducing the weight of the device and reducing the cost.

[0013] Preferably, the inner side of the lower die sleeve is tapered.

[0014] Through the above technical scheme, the beneficial effects of the present application are as follows:

[0015] 1. The first exhaust hole and the second exhaust hole arranged on the lower die sleeve and the upper and lower dies facilitate the extrusion and discharge of gas in the related parts during the mold pressing forming, thereby avoiding the generation of bubbles in the product and causing product defects.

[0016] 2. The upper protrusion and the lower protrusion arranged on the opposite surfaces of the upper die and the lower die effectively increase the contact surface between the upper die, the lower die and the product raw material during the mold pressing forming, thereby ensuring the pressing effect, the density of the formed product and the gas discharge effect.

[0017] 3. The lower die sleeve is inverted and fixed on the upper end of the demolding base plate, the demolding block is placed above the product formed in the lower die sleeve, and then the product is pressed out of the lower die sleeve and falls on the inner side of the demolding base plate, so that the damage to the product is effectively avoided during the demolding process, and the demolding is simple. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is a structure schematic view of the mold pressing forming of the present application.

[0019] Fig. 2 It is a structure schematic view of the demolding of the present application.

[0020] The numbers in the attached diagram are as follows: 1 is the upper mold, 2 is the upper mold sleeve, 3 is the lower mold sleeve, 4 is the lower mold, 5 is the upper protrusion, 6 is the lower protrusion, 7 is the first vent hole, 8 is the second vent hole, 9 is the demolding pad, 10 is the demolding module, 11 is the annular plate, 12 is the upper groove, 13 is the lower groove, 14 is the groove body, 15 is the product blank, 16 is the annular block, 17 is the upper threaded hole, and 18 is the lower threaded hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0022] like Figs. 1-2 As shown, this embodiment provides an apparatus for hot pressing, including a preparation mechanism and a demolding mechanism, such as... Fig. 1 As shown, the preparation mechanism includes an upper mold 1, an upper mold sleeve 2, a lower mold sleeve 3, and a lower mold 4 arranged sequentially from top to bottom, for preparing and molding the product blank 15. An upper protrusion 5 is fixedly disposed in the middle of the side of the upper mold 1 facing the lower mold 4, and a lower protrusion 6 is fixedly disposed in the middle of the side of the lower mold 4 facing the upper mold 1. There is a gap between the upper protrusion 5 and the lower protrusion 6. The upper protrusion 5 is smoothly connected to the lower side of the upper mold 1 and integrally formed, and the lower protrusion 6 is smoothly connected to the upper side of the lower mold 4 and integrally formed. During product molding, both the upper protrusion 5 and the lower protrusion 6 are located within the lower mold sleeve 3 and are in full contact with the product to ensure that the pressure exerted on the product by the upper and lower molds during the hot pressing process, including the vertical direction... The pressure and the outward pressure along the upper protrusion 5 and the lower protrusion 6 in the circumferential direction ensure the quality of the product blank 15 after hot pressing. The lower mold sleeve 3 is provided with multiple first vent holes 7 in the circumferential direction. The upper protrusion 5 and the lower protrusion 6 are provided with second vent holes 8 that penetrate the upper mold 1 and the lower mold 4. Taking fiber resin hot pressing as an example, during the preparation process, the fiber resin material is added into the lower mold sleeve 3, and then the upper mold 1 is pressed down by the hot pressing machine. The upper mold 1 moves down along the upper mold sleeve 2 to squeeze the fiber resin material. The gas and some resin are discharged through the first vent holes 7 and the second vent holes 8 to ensure that there are no air bubbles left in the final product blank 15 and to ensure the molding quality.

[0023] An annular block 16 is fixedly installed on the outer side of the upper end of the upper mold. The annular block 16 has multiple circumferentially evenly distributed upper threaded holes 17, each corresponding to the upper end face of the upper mold sleeve 2. The lower mold 4 has multiple circumferentially evenly distributed lower threaded holes 18, each corresponding to the lower end face of the lower mold sleeve 3. After the product blank 15 is formed, the bolts screwed into the upper threaded holes 17 and lower threaded holes 18 are rotated, causing the bolts to press against the end faces of the upper mold sleeve 2 and lower mold sleeve 3 respectively. As the bolts are rotated, the upper mold 2 and lower mold 3 move away from the upper mold sleeve 2 and lower mold sleeve 3 respectively. This separates the upper mold 1 from the product blank 15, completing the disassembly of the upper mold 1 and lower mold 4, and simultaneously disassembling the upper mold sleeve 2. Subsequently, the product blank 15 inside the lower mold sleeve 3 is demolded.

[0024] An annular plate 11 is fixedly provided on the lower side of the upper mold sleeve 2. The upper mold sleeve 2 and the annular plate 11 are integrally formed. The annular plate 11 is sleeved on the upper end of the lower mold sleeve 3. The annular plate 11 and the lower mold sleeve 3 are fastened together by bolts. The setting of the annular plate 11 ensures the axial and radial fixing effect between the upper mold sleeve 2 and the lower mold sleeve 3, and at the same time facilitates disassembly.

[0025] The upper mold 1 has an upper groove 12 in the middle, and the lower mold 4 has a lower groove 13 in the lower middle. Both the upper groove 12 and the lower groove 13 are connected to the corresponding second vent hole 8. The upper groove 12 reduces the weight of the upper mold 1 and lowers the manufacturing cost of the upper mold 1, while the lower groove 13 ensures the venting effect of the corresponding second vent hole 8.

[0026] like Fig. 2 As shown, the demolding mechanism includes a demolding pad 9 and a demolding module 10. The demolding pad 9 is an annular block. The upper end of the demolding pad 9 is set with a stepped surface that matches the end of the lower mold sleeve 3. The inner side of the lower mold sleeve 3 is tapered. The difference in the inner diameter between the two ends of the lower mold sleeve 3 is 1-2 mm. During demolding, the lower mold sleeve 3 is inverted (with the larger opening of the tapered inner side facing down for easy demolding) and placed on the stepped surface at the upper end of the demolding pad 9. The inner diameter of the demolding pad 9 is larger than the inner diameter of the lower mold sleeve 3, and the inner diameter of the demolding module 10 is smaller than the inner diameter of the lower mold sleeve 3. Then, the demolding module 10 is placed on the product blank 15. The demolding module 10 is pressed down by a hot press molding machine to push the product blank 15 downward out of the lower mold sleeve 3, so that it falls into the demolding pad 9, completing the demolding operation. The demolding module 10 has a cylindrical structure. A groove 14 is opened on the top of the demolding module 10 to reduce the weight of the demolding module 10 and reduce the material used in the demolding module 10.

[0027] An annular plate is fixedly installed on the lower mold 4. The inner diameter of the annular plate matches the outer diameter of the lower mold sleeve 3, which is used to limit the lower mold sleeve 3.

[0028] In use, the lower die sleeve 3 with the corresponding inner cavity shape is selected according to the product shape, the upper die sleeve 2 matched with the lower die sleeve 3 is selected, and the preparation mechanism with the corresponding size is selected according to the product shape size, that is, the inner cavity size of the lower die sleeve 3 has a single-side allowance of about 5 mm compared with the product, then the upper die 1, the upper die sleeve 2, the lower die sleeve 3 and the lower die 4 are cleaned, and the inner cavity profile and the threaded hole and the like are sprayed with a release agent to facilitate demolding after molding and taking out, and the lower die sleeve 3 is installed on the lower die 4, and the upper die sleeve 2 is installed on the lower die sleeve 3.

[0029] Then the prepreg (the prepreg is a fiber resin, and more prepreg is filled than actually needed after molding to correspond to the subsequent pre-pressing and exhaust of the resin squeezed out) is filled into the lower die sleeve 3, then the upper die 1 is installed, and the pre-pressing (pressing and heating at the same time) is performed by using a hot-pressing molding machine, the pre-pressing is performed 3-4 times (that is, a part is pressed down each time, and then it is stopped for a while to wait for the gas to be exhausted), and it is ensured that the gas in the prepreg is exhausted through the first exhaust port 7 and the second exhaust port 8 (in the pre-pressing process, part of the resin with the gas is exhausted from the exhaust hole).

[0030] After the product blank 15 is molded, the upper die 1, the upper die sleeve 2 and the lower die 4 are disassembled, the lower die sleeve 3 with the product blank 15 is inverted (the large mouth of the conical inner side faces downward to facilitate demolding), and is placed on the stepped surface at the upper end of the die pad 9, then the demolding block 10 is placed on the product blank 15, the demolding block 10 is pressed downward by the hot-pressing molding machine, the product blank 15 is pushed out of the lower die sleeve 3, and falls into the die pad 9, and the demolding work is completed.

[0031] Then the product blank 15 is machined to obtain the product.

[0032] The above-described embodiments are only preferred embodiments of the present application, and are not intended to limit the implementation range of the present application, so that equivalent changes or modifications made according to the structure, features and principles described in the patent range of the present application should be included in the patent range of the present application.

Claims

1. An apparatus for hot pressing, characterized in that, The device includes a preparation mechanism and a demolding mechanism. The preparation mechanism includes an upper mold (1), an upper mold sleeve (2), a lower mold sleeve (3), and a lower mold (4) arranged sequentially from top to bottom. An upper protrusion (5) is fixedly provided in the middle of the side of the upper mold (1) facing the lower mold (4). A lower protrusion (6) is fixedly provided in the middle of the side of the lower mold (4) facing the upper mold (1). There is a gap between the upper protrusion (5) and the lower protrusion (6). A plurality of first vent holes (7) are provided circumferentially on the lower mold sleeve (3). A second vent hole (8) penetrating the upper mold (1) and the lower mold (4) is provided on both the upper protrusion (5) and the lower protrusion (6). The demolding mechanism includes a demolding pad (9) and a demolding module (10). The upper end of the demolding pad (9) is set with a stepped surface that matches the end of the lower mold sleeve (3). The inner diameter of the demolding module (10) is smaller than the inner diameter of the lower mold sleeve (3). The demolding pad (9) is an annular block, and the demolding module (10) is a cylindrical structure.

2. The apparatus for hot pressing according to claim 1, characterized in that, An annular plate (11) is fixedly provided on the lower side of the upper mold sleeve (2). The annular plate (11) is sleeved on the upper end of the lower mold sleeve (3). The annular plate (11) and the lower mold sleeve (3) are fastened together by bolts.

3. The apparatus for hot pressing according to claim 1, characterized in that, An annular block (16) is fixedly installed on the outer side of the upper end of the upper mold. Multiple threaded holes (17) are evenly distributed in the circumference on the annular block. The multiple threaded holes (17) correspond to the upper end face of the upper mold sleeve (2). Multiple threaded holes (18) are evenly distributed in the circumference on the lower mold (4). The multiple threaded holes (18) correspond to the lower end face of the lower mold sleeve (3).

4. The apparatus for hot pressing according to claim 1, characterized in that, The upper protrusion (5) is smoothly connected to the lower side of the upper mold (1) and integrally formed, and the lower protrusion (6) is smoothly connected to the upper side of the lower mold (4) and integrally formed.

5. The apparatus for hot pressing according to claim 1, characterized in that, The upper mold (1) has an upper groove (12) in the middle, and the lower mold (4) has a lower groove (13) in the middle of the lower side. Both the upper groove (12) and the lower groove (13) are connected to the corresponding second vent hole (8).

6. The apparatus for hot pressing according to claim 1, characterized in that, The top of the detachable module (10) is provided with a groove (14).

7. The apparatus for hot pressing according to claim 1, characterized in that, The inner side of the lower mold sleeve (3) is tapered.

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