Hot press forming die capable of preventing generation of pocks

Abstract

The utility model discloses a hot press forming die capable of preventing generation of hard spots, which comprises an upper die and a bottom die, a convex die is arranged on the upper die, a concave cavity matched with the convex die is arranged on the bottom die, the cross section of the convex die is gradually reduced from the upper die to the bottom die, a clearance groove is arranged on the surface of the convex die, and the cross section of the convex die is square. The four side faces and the end face of the male die are each provided with a receding groove, and the concave cavities are matched with the male die in shape. According to the hot-press forming die, due to the fact that the receding grooves are formed in the four side faces and the end faces of the male die, the positions, corresponding to the receding grooves, of the formed box body semi-finished product do not have pocking marks, the pocking marks can be reduced to the maximum extent as long as the shapes and the positions of the receding grooves are set, and the appearance quality of the box body semi-finished product is improved; the semi-finished product of the box body only needs to be simply ground and polished when some pocking marks are generated at the corners, so that the manufacturing efficiency of the acrylic box body can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot press forming die field, especially relate to a kind of hot press forming die of preventing pitting. BACKGROUND

[0002] Acrylic box body is a kind of container made of polymethyl methacrylate (PMMA) material, is widely used in life and business field, one of the characteristics of acrylic box body is that it has high transparency, its light transmittance can reach more than 92%, has the reputation of "plastic crystal", can clearly show the goods in box, light diffusion is uniform, visual effect is excellent.

[0003] The existing acrylic box body is basically injection molded, in the injection molding process, if injection speed is too fast, pressure is insufficient or mold temperature is uneven, resin filling will not be sufficient, leading to the surface of acrylic box body to produce pitting, some acrylic box body is formed by hot pressing, upper die and bottom die will also lead to the surface of acrylic box body to produce pitting in the pressing process, usually need subsequent process to repair pitting such as polishing, thereby leading to the production efficiency of acrylic box is not high. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the above-mentioned prior art, provide a kind of hot press forming die of preventing pitting.

[0005] According to one aspect of the utility model, provide a kind of hot press forming die of preventing pitting, including upper die and bottom die, upper die is equipped with male die, bottom die is equipped with the concave cavity of being adapted to male die,

[0006] The cross section of male die gradually decreases from upper die to bottom die direction, the surface of male die is equipped with empty groove, the cross section of male die is square, the empty groove is equipped on the four side surfaces and end surface of male die,

[0007] The shape of concave cavity is adapted to male die.

[0008] The hot-pressing mold of the utility model, the heated acrylic plate is placed between the upper die and the bottom die, the upper die moves to the bottom die direction until the convex die on the upper die is embedded in the concave cavity on the bottom die, the acrylic plate is hot-pressed into a semi-finished product which is adapted to the shape of the convex die, because the cross section of the convex die gradually decreases from the upper die to the bottom die and the cross section of the convex die is square, the shape of the semi-finished product formed by hot-pressing is a box body semi-finished product which is square in cross section from the opening to the bottom and gradually decreases, the box body semi-finished product can be cut and processed by the guide die, because the surface of the convex die is provided with the empty-avoiding groove, the box body semi-finished product formed will not have the burr at the position corresponding to the empty-avoiding groove, because the four sides and the end face of the convex die are all provided with the empty-avoiding groove, the four sides and the bottom of the box body semi-finished product formed by hot-pressing will not have the burr at the position corresponding to the empty-avoiding groove, as long as the shape and the position of the empty-avoiding groove are set, the generation of the burr can be reduced to the maximum extent, the appearance quality of the box body semi-finished product is improved, the box body semi-finished product only has a little burr at the corner position, which can be polished simply, so that the manufacturing efficiency of the acrylic box body can be improved.

[0009] Further, the empty-avoiding groove comprises two first empty-avoiding grooves, a second empty-avoiding groove, two third empty-avoiding grooves and a fourth empty-avoiding groove, the two first empty-avoiding grooves are respectively arranged on the two opposite first side and third side of the convex die, the second empty-avoiding groove is arranged on the second side of the convex die, the two third empty-avoiding grooves are arranged on the fourth side of the convex die, one third empty-avoiding groove is close to the first side, and the other third empty-avoiding groove is close to the third side, and the fourth empty-avoiding groove is arranged on the end face of the convex die.

[0010] Therefore, the position corresponding to the first empty-avoiding groove on the first side and the third side of the convex die of the box body semi-finished product formed by hot-pressing will not have the burr, the position corresponding to the second empty-avoiding groove on the second side of the convex die of the box body semi-finished product formed by hot-pressing will not have the burr, the position corresponding to the third empty-avoiding groove on the fourth side of the convex die of the box body semi-finished product formed by hot-pressing will not have the burr, and the position corresponding to the fourth empty-avoiding groove on the end face of the convex die of the box body semi-finished product formed by hot-pressing will not have the burr, so that the generation of the burr is reduced to the maximum extent.

[0011] Further, the first empty-avoiding groove is in trapezoidal shape, the second empty-avoiding groove is in trapezoidal shape, the third empty-avoiding groove is in triangular shape, and the fourth empty-avoiding groove is in square shape.

[0012] Therefore, by setting the shape of the empty-avoiding groove, the generation of the burr is reduced to the maximum extent.

[0013] Further, one first empty-avoiding groove covers the first side, the other first empty-avoiding groove covers the third side, the second empty-avoiding groove covers the second side, and the fourth empty-avoiding groove covers the end face of the convex die.

[0014] Therefore, the hot-pressing formed box body semi-finished product only has a little burr at the corner between the side surface and the side surface, the corner between the bottom surface and the side surface, and the maximum burr is reduced, and the burr at the corner of the box body semi-finished product only needs to be polished and polished, so that the production efficiency of the acrylic box body can be maximized.

[0015] Further, the corners between the second side surface and the first side surface and the third side surface of the male die are arc-shaped, the corners between the fourth side surface and the first side surface and the third side surface are arc-shaped, and the corners between the end surface and the first side surface, the second side surface, the third side surface and the fourth side surface of the male die are arc-shaped.

[0016] Therefore, the corners on the male die are used to press and form the heated acrylic plate, the corners on the male die correspond to the corners in the inner cavity of the formed acrylic box body, and the arc-shaped corners on the male die can make the corners in the inner cavity of the hot-pressing formed box body semi-finished product arc-shaped.

[0017] Further, the inner wall of the cavity is provided with a slope-shaped boss,

[0018] When the upper die is embedded in the bottom die, the boss is located between the two third clearance grooves.

[0019] Therefore, the subsequent process of the acrylic box body at the position corresponding to the boss needs to be reprocessed to form a fixed hole, and the position is blocked when the acrylic box body is installed and used. Therefore, even if a burr is generated, it will not affect the appearance quality of the acrylic box body. The male die does not need to be provided with a clearance groove at this position, and the boss can also play a supporting and limiting role during the hot-pressing forming process. As long as the fourth side surface of the male die presses the acrylic plate on the boss, the complete embedding of the male die and the bottom die is completed.

[0020] Further, the periphery of the root of the male die is provided with a ring-shaped pressing die, and the top of the bottom die is provided with a ring-shaped bearing seat, and the bearing seat is surrounded by the periphery of the top opening of the cavity,

[0021] When the upper die is embedded in the bottom die, the pressing die can be pressed on the bearing seat.

[0022] Therefore, the pressing die and the bearing seat are used to hot-press the flange of the box body semi-finished product.

[0023] Further, the thickness of the outer side of the pressing die is greater than the thickness of the inner side, and the thickness of the outer side of the bearing seat is less than the thickness of the inner side.

[0024] Therefore, the flange of the hot-pressing formed box body semi-finished product can be deformed by interference, and when the box body semi-finished product cools down, the flange of the box body semi-finished product is ensured to be flat.

[0025] Further, the corner positions on the end face of the die towards the bearing seat are arc-shaped, and the corner positions on the end face of the bearing seat towards the die are arc-shaped.

[0026] Therefore, the flange of the hot-pressing formed box body semi-finished product can be smoothly transitioned at the corner position. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structure schematic diagram of the hot-pressing forming die for preventing the generation of the pimple is shown in the figure.

[0028] Figure 2 A structure schematic diagram of the upper die in the hot-pressing forming die is shown in the figure. Figure 1

[0029] Figure 3 A structure schematic diagram of the upper die in the hot-pressing forming die is shown in the figure. Figure 2

[0030] Figure 4 A use state diagram of the hot-pressing forming die is shown in the figure. Figure 1

[0031] A structure schematic diagram of the hot-pressing forming die along the A-A direction is shown in the figure. Figure 5 Figure 4 A structure schematic diagram of the hot-pressing forming die along the B-B direction is shown in the figure.

[0032] Figure 6 Figure 4 A structure schematic diagram of the hot-pressing forming die along the B-B direction is shown in the figure.

[0033] Figure 7 A structure schematic diagram of the hot-pressing forming die along the B-B direction is shown in the figure. Figure 4

[0034] Figure 8 A structure schematic diagram of the hot-pressing forming die along the B-B direction is shown in the figure. Figure 7 DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0036] ​​​​​​In the description of the utility model, need understanding is, the term "upper", "lower", "front", "back", "left", "right", "top", "bottom", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation structure and operation, therefore can not be understood as the restriction of the utility model. In addition, the term "first", "second" and so on are only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the utility model, unless otherwise specified, "a plurality of" means two or more than two;It should be noted that, unless otherwise specified and limited, the term "mounting", "connected", "connected", "set" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, can be electrically connected, can be directly connected, can be indirectly connected through intermediate medium, can be the communication inside two elements.

[0037] Referring to Figures 1 to 3 A hot press forming die for preventing pitting, comprising an upper die 1 and a bottom die 2.

[0038] Referring to Figures 1 to 3 The end face of the upper die 1 facing the bottom die 2 is formed with a male die 11, and the cross section of the male die 11 gradually decreases from the upper die 1 to the bottom die 2. In this embodiment, the cross section of the male die 11 is square, and the male die 11 corresponds to the style of the box body semi-finished product to be hot press formed. The bottom die 2 is provided with a concave cavity 21 adapted to the shape of the male die 11. When the upper die 1 moves towards the bottom die 2 and the male die 11 on the upper die 1 is fitted into the concave cavity 21 on the bottom die 2, the acrylic plate is hot-pressed into a semi-finished product adapted to the shape of the male die 11. Therefore, the semi-finished product formed by hot pressing is a box body semi-finished product with an opening to the bottom, a square cross section and a gradually decreasing cross section. Figure 7

[0039] Referring to Figure 2 And Figure 3 ​The surface of the male die 11 is formed with a clearance groove, and the four sides and the end surface of the male die 11 are formed with a clearance groove. Specifically, the clearance groove includes two first clearance grooves 12, a second clearance groove 13, two third clearance grooves 14, and a fourth clearance groove 15. The two first clearance grooves 12 are respectively arranged on the two opposite first side 111 and third side 113 of the male die 11. The second clearance groove 13 is arranged on the second side 112 of the male die 11. The two third clearance grooves 14 are arranged on the fourth side 114 of the male die 11. One third clearance groove 14 is close to the first side 111, and the other third clearance groove 14 is close to the third side 113. The fourth clearance groove 15 is arranged on the end surface of the male die 11. The first clearance groove 12 is in a trapezoidal shape, the second clearance groove 13 is in a trapezoidal shape, the third clearance groove 14 is in a triangular shape, and the fourth clearance groove 15 is in a square shape. One first clearance groove 12 covers the first side 111, and the area of the first clearance groove 12 is slightly smaller than the area of the first side 111. The other first clearance groove 12 covers the third side 113, and the area of the first clearance groove 12 is slightly smaller than the area of the third side 113. The second clearance groove 13 covers the second side 112, and the area of the second clearance groove 13 is slightly smaller than the area of the second side 112. The fourth clearance groove 15 covers the end surface of the male die 11, and the area of the fourth clearance groove 15 is slightly smaller than the area of the end surface of the male die 11. The position of the hot-press formed box body semi-finished product corresponding to the first clearance groove 12 on the first side 111 and the third side 113 of the male die 11 will not have a pimple, the position of the hot-press formed box body semi-finished product corresponding to the second clearance groove 13 on the second side 112 of the male die 11 will not have a pimple, the position of the hot-press formed box body semi-finished product corresponding to the third clearance groove 14 on the fourth side 114 of the male die 11 will not have a pimple, and the position of the hot-press formed box body semi-finished product corresponding to the fourth clearance groove 15 on the end surface of the male die 11 will not have a pimple, thereby the generation of pimples can be reduced to the greatest extent. In other embodiments, the shape, position, number, and area size of the clearance groove can be adjusted according to the shape of the acrylic box body to reduce the generation of pimples to the greatest extent.

[0040] Referring to Figure 3, the position between the first avoiding recess 12 on the first side surface 111 of the male die 11 and the second avoiding recess 13 on the second side surface 112 is the corner position between the first side surface 111 and the second side surface 112 of the male die 11, the position between the first avoiding recess 12 on the third side surface 113 of the male die 11 and the second avoiding recess 13 on the second side surface 112 is the corner position between the third side surface 113 and the second side surface 112 of the male die 11, the position between the first avoiding recess 12 on the first side surface 111 of the male die 11 and the third avoiding recess 14 on the fourth side surface 114 close to the first side surface 111 is the corner position between the first side surface 111 and the fourth side surface 114 of the male die 11, the position between the first avoiding recess 12 on the third side surface 113 of the male die 11 and the third avoiding recess 14 on the fourth side surface 114 close to the third side surface 113 is the corner position between the third side surface 113 and the fourth side surface 114 of the male die 11, the position between the fourth avoiding recess 15 on the end surface of the male die 11 and the first avoiding recess 12 on the first side surface 111 is the corner position between the end surface and the first side surface 111 of the male die 11, the position between the fourth avoiding recess 15 on the end surface of the male die 11 and the second avoiding recess 13 on the second side surface 112 is the corner position between the end surface and the second side surface 112 of the male die 11, the position between the fourth avoiding recess 15 on the end surface of the male die 11 and the first avoiding recess 12 on the third side surface 113 is the corner position between the end surface and the third side surface 113 of the male die 11, and the corner position between the fourth avoiding recess 15 on the end surface of the male die 11 and the fourth side surface 114 is the corner position between the end surface and the fourth side surface 114 of the male die 11. Thus, the corner positions on the male die 11 are used to press and form the heated acrylic plate, the corner positions on the male die 11 correspond to the corner positions in the inner cavity of the formed acrylic box body, and since one first avoiding recess 12 covers the first side surface 111, another first avoiding recess 12 covers the third side surface 113, the second avoiding recess 13 covers the second side surface 112, and the fourth avoiding recess 15 covers the end surface of the male die 11, the hot-press formed box body semi-finished product only has some slight pitting at the corner positions between the side surfaces and the corner positions between the bottom surface and the side surface, which maximally reduces the generation of pitting, and only needs to be simply polished at the pitting generated at the corner positions of the box body semi-finished product, thereby maximally improving the production efficiency of the acrylic box body.

[0041] Referring to Figure 3, the second side 112 of the male die 11 and the first side 111, the third side 113 are arc-shaped, the fourth side 114 and the first side 111, the third side 113 are arc-shaped, the end face of the male die 11 and the first side 111, the second side 112, the third side 113, the fourth side 114 are arc-shaped, the corner position on the male die 11 is used for hot pressing the acrylic plate after heating, the corner position on the male die 11 corresponds to the corner position in the inner cavity of the acrylic box body, and the corner position in the inner cavity of the hot-pressed box body semi-finished product is arc-shaped.

[0042] Referring to Figure 2 , the inner wall of the concave cavity 21 is formed with a slope-shaped boss 211, when the upper die 1 is embedded in the lower die 2, the boss 211 is located between the two third clearance grooves 14 on the fourth side 114 of the male die 11, the hot-pressed acrylic box body needs to be reprocessed for fixing holes at the position corresponding to the boss 211 in the subsequent process, and the place is blocked when the acrylic box body is installed and used. Therefore, even if a pimple is generated, it will not affect the appearance quality of the acrylic box body, and the male die 11 does not need to be provided with a clearance groove at this position. In the process of hot pressing, the boss 211 can also play a supporting and limiting role. As long as the fourth side 114 of the male die 11 presses the acrylic plate on the boss 211, the complete embedding of the male die 11 and the lower die 2 is completed.

[0043] Referring to Figures 1 to 3 , the periphery of the root of the male die 11 is formed with a ring-shaped pressing die 16, and the top of the lower die 2 is formed with a ring-shaped bearing seat 22. The bearing seat 22 is surrounded by the periphery of the opening at the top of the concave cavity 21. When the upper die 1 is embedded in the lower die 2, the pressing die 16 can be pressed on the bearing seat 22. The pressing die 16 and the bearing seat 22 are used for hot pressing the flange of the box body semi-finished product.

[0044] Referring to Figure 3 , the thickness of the outer side of the pressing die 16 is greater than the thickness of the inner side (i.e. high outside and low inside), referring to

[0045] Figure 2 , the thickness of the outer side of the bearing seat 22 is less than the thickness of the inner side (i.e. low outside and high inside), so that the flange of the hot-pressed box body semi-finished product can be deformed in excess during the hot pressing process. After the box body semi-finished product cools, the flange of the box body semi-finished product is in a flat state.

[0046] Referring to Figure 3 , the corner positions on the end face of the pressing die 16 facing the bearing seat 22 are arc-shaped, referring to

[0047] Referring to Figure 2The corners of the end face of the bearing seat 22 facing the mold 16 are all arc-shaped, which allows the flanges of the hot-pressed box semi-finished product to transition smoothly at the corners.

[0048] See Figures 4 to 8 The hot-pressing mold of this utility model places a heated acrylic sheet between an upper mold 1 and a bottom mold 2. The upper mold 1 moves towards the bottom mold 2 until the punch 11 on the upper mold 1 is fitted into the cavity 21 on the bottom mold 2. The acrylic sheet is hot-pressed into a box-shaped semi-finished product 3 that matches the shape of the punch 11. The box-shaped semi-finished product 3 is then cut and processed by a template to form an acrylic box 4. When the upper mold 1 is fitted into the bottom mold 2, the pressing mold 16 presses the edge of the acrylic sheet onto the support seat 22. The pressing mold 16 and the support seat 22 are used to hot-press and form the flange 31 of the box-shaped semi-finished product 3. The die 16 and the support seat 22 can perform interference deformation on the flange 31 of the box semi-finished product 3 during the hot pressing process. After the box semi-finished product 3 cools down, it ensures that the flange 31 of the box semi-finished product 3 is in a straight state. Since one first clearance groove 12 is filled with the first side 111 of the punch 11, another first clearance groove 12 is filled with the third side 113 of the punch 11, the second clearance groove 13 is filled with the second side 112 of the punch 11, and the fourth clearance groove 15 is filled with the end face of the punch 11, the two third clearance grooves 14 on the fourth side 114 of the punch 11 ( Figure 4 As shown, there are bosses 211 supporting the box body 3, which is formed by hot pressing. No pitting will occur at the corresponding positions of the first clearance groove 12, the second clearance groove 13, the third clearance groove 14, and the fourth clearance groove 15. Only a few pitting points occur at the corners between the sides and between the bottom and the sides. These pitting points at the corners can be easily removed by grinding and polishing. By properly setting the shape, position, number, and size of the clearance grooves, the occurrence of pitting points can be minimized, improving the appearance quality of the box body 3. To maximize the production efficiency of the acrylic box, the acrylic box 4 formed by hot pressing requires multiple fixing holes 41 to be reprocessed at the position corresponding to the boss 211 in subsequent processes. This position of the acrylic box 4 will be covered when it is installed and used, so even if there are pits, it will not affect the appearance quality of the acrylic box. The punch 11 does not need to be set with a clearance groove at this position. During the hot pressing process, the boss 211 can also play a supporting and limiting role. As long as the fourth side 114 of the punch 11 presses the acrylic sheet onto the boss 211, the complete fitting of the punch 11 and the bottom mold 2 is completed.

[0049] The above merely describes some embodiments of the present application, which are intended to illustrate the technical means of the present application, and are not intended to limit the technical scope of the present application. Any improvement of the present application made by those skilled in the art in combination with the prior art knowledge is within the protection scope of the present application.

Claims

1. A hot press forming die for preventing the generation of pits, comprising an upper die and a lower die, the upper die being provided with a male die, and the lower die being provided with a female cavity adapted to the male die, characterized in that, the cross section of the male die gradually decreases from the upper die to the lower die, the surface of the male die is provided with a clearance groove, the cross section of the male die is square, and the clearance groove is provided on the four sides and the end face of the male die, the female cavity is adapted to the shape of the male die.

2. The hot press forming die according to claim 1, characterized by the clearance groove comprises two first clearance grooves, a second clearance groove, two third clearance grooves and a fourth clearance groove, the two first clearance grooves are respectively provided on the two opposite first sides and the third side of the male die, the second clearance groove is provided on the second side of the male die, the two third clearance grooves are provided on the fourth side of the male die, one third clearance groove is close to the first side, and the other third clearance groove is close to the third side, and the fourth clearance groove is provided on the end face of the male die.

3. The hot press forming die according to claim 2, characterized by the first clearance groove is trapezoidal, the second clearance groove is trapezoidal, the third clearance groove is triangular, and the fourth clearance groove is square.

4. The hot press forming die according to claim 3, characterized by one first clearance groove covers the first side, the other first clearance groove covers the third side, the second clearance groove covers the second side, and the fourth clearance groove covers the end face of the male die.

5. The hot press forming die according to claim 4, characterized by the corner positions between the second side and the first side and the third side of the male die are arc-shaped, the corner positions between the fourth side and the first side and the third side of the male die are arc-shaped, and the corner positions between the end face and the first side, the second side, the third side and the fourth side of the male die are arc-shaped.

6. The hot press forming die according to claim 3, characterized by the inner wall of the female cavity is provided with a ramp-shaped boss, when the upper die is embedded in the lower die, the boss is located between the two third clearance grooves.

7. The hot press molding mold according to any one of claims 1 to 6, characterized by the periphery of the root of the male die is provided with a ring of a pressing die, the top of the lower die is provided with a ring of a bearing seat, the bearing seat is enclosed in the periphery of the opening at the top of the female cavity, when the upper die is embedded in the lower die, the pressing die can be pressed on the bearing seat.

8. The hot press forming die according to claim 7, characterized by the thickness of the outer side of the pressing die is greater than that of the inner side, and the thickness of the outer side of the bearing seat is less than that of the inner side.

9. The hot press forming die according to claim 8, characterized by the corner positions on the end face of the pressing die facing the bearing seat are arc-shaped, and the corner positions on the end face of the bearing seat facing the pressing die are arc-shaped.

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