Packing cup forming die

Abstract

A leather cup forming die comprises an upper die, a lower die, a die core, an elastic connecting piece and a heating assembly. The upper die comprises an upper die main body and a pressing convex edge; and the lower die comprises a lower die main body and a die core mounting hole. The mold core comprises a mold core main body, a leather cup forming part and an elastic connecting piece mounting hole. And the elastic connecting piece is used for elastically mounting the mold core in the mold core mounting hole along the axial direction through the elastic connecting piece mounting hole. And the diameter of the leather cup forming part is smaller than that of the circular groove, and the diameter of the pressing convex edge is smaller than that of the mold core mounting hole, so that uniform annular partition grooves are formed between the leather cup forming part and the pressing convex edge as well as between the pressing convex edge and the lower mold main body. When the leather cup is manufactured, a disc-shaped material is placed on the leather cup forming part, the downward pressing convex edge is inserted between the leather cup forming part and the lower die, and the disc-shaped material is pressed into a cup shape.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of leather bowl manufacturing, especially relates to a leather bowl forming die. BACKGROUND

[0002] Leather bowl is a kind of bowl-shaped sealing element, its widely used field is in engineering machinery, automobile manufacturing, ship, wind power generation, agricultural machinery and many other fields, mainly plays the role of transmitting pressure and sealing in hydraulic brake system and pneumatic system.Leather bowl can be made of various materials such as rubber, PTFE, polyurethane etc. with good elasticity and wear resistance according to use demand.

[0003] The existing leather bowl manufacturing usually adopts mold injection molding, that is, by pouring molten raw material into the mold and then cooling forming.After injection molding, the process usually includes melting, filling, cooling opening mold, demolding and shape finishing etc.

[0004] Therefore, the leather bowl manufacturing process is complicated, and the operation is complex, which is not conducive to improving production efficiency.At the same time, bubbles are easily produced in the injection molding process, so that the produced leather bowl does not meet the requirements, causing material waste.At the same time, the leather bowl of injection molding may also cause uneven thickness of leather bowl due to the problems such as mold inclination and uneven injection. SUMMARY

[0005] Therefore, the utility model provides a leather bowl forming die to solve the above problems.

[0006] The application relates to a skin bowl forming die, which comprises an upper die, a lower die fixedly arranged on one side of the upper die, a die core accommodated in the lower die and elastically connected with the lower die, an elastic connecting piece for connecting the die core with the lower die, and at least two heating components arranged on the upper die and the lower die respectively and used for heating the skin bowl forming die. The upper die comprises an upper die body and a pressing convex edge arranged on the side of the upper die body facing the lower die. The lower die comprises a lower die body and a die core mounting hole arranged on the lower die body. The die core comprises a die core body, a guide cylinder arranged on the side of the die core body opposite to the upper die, a skin bowl forming part arranged on the side of the die core body facing the upper die, and an elastic connecting piece mounting hole arranged in the middle of the die core body. The elastic connecting piece is elastically mounted in the die core mounting hole in the axial direction through the elastic connecting piece mounting hole. The pressing convex edge surrounds a circular groove at the end of the upper die body. The diameter of the skin bowl forming part is smaller than that of the circular groove, and the diameter of the pressing convex edge is smaller than that of the die core mounting hole, so that a uniform annular separation groove is formed between the skin bowl forming part and the pressing convex edge and between the pressing convex edge and the lower die body. When the upper die is pressed, the skin bowl forming part is inserted into the circular groove formed by the pressing convex edge, the pressing convex edge is inserted between the skin bowl forming part and the lower die, and a circular material sheet arranged on the skin bowl forming part is pressed to form a bowl shape.

[0007] Further, the die core body, the guide cylinder and the skin bowl forming part are integrally formed, and the cross section of the die core body and the guide cylinder is in T-shaped structure.

[0008] Further, the shape of the die core mounting hole is matched with the shape of the die core, and the outer side wall of the die core body and the guide cylinder is matched with the inner side wall of the die core mounting hole.

[0009] Further, the elastic connecting piece comprises a connecting screw rod for connecting the die core with the lower die, and a spring sleeved on the screw rod.

[0010] Further, the elastic mounting hole comprises a fixing hole arranged on one side of the die core body and a spring accommodating cavity arranged at one end of the fixing hole.

[0011] Further, the connecting screw rod is arranged in matching with the fixing hole, and when the die core is mounted, one end of the connecting screw rod is inserted into the elastic connecting piece mounting hole from one side of the elastic connecting piece limiting hole and is screwed with the fixing hole.

[0012] Further, the length of the connecting screw rod is just enough to make the end face of the skin bowl forming part flush with the end face of the lower die body when the spring is in a free state, i.e. not compressed.

[0013] Further, the spring is accommodated in the spring accommodating cavity and sleeved on the connecting screw rod. Further, the heating assembly comprises at least two heating rod mounting holes respectively arranged on the upper die and the lower die, and at least two heating rods respectively accommodated in the heating rod mounting holes.

[0014] Compared with the prior art, the skin bowl forming die comprises the upper die, the lower die, the die core arranged in the lower die, and the heating assembly arranged between the upper die and the lower die and used for heating the upper die and the lower die. When the skin bowl is made, the upper die and the lower die are preheated by the heating assembly, then the upper die is driven to press down the die core to directly press the round sheet material into a bowl shape according to the size of the skin bowl, and the pressing state of the upper die is maintained for a period of time after the skin bowl is formed until the skin bowl is cooled and shaped, so that the skin bowl is not deformed after being taken out due to incomplete cooling. Since the interval between the pressing convex edge, the skin bowl forming part and the lower die is uniform, the thickness of the skin bowl body pressed by the skin bowl forming die is uniform, and the skin bowl is formed and shaped by one-time processing after being pressed by the skin bowl forming die, so that the structure of the skin bowl after shaping is stable and not easy to deform. Meanwhile, the spring props up the die core after the upper die is moved away, and the formed skin bowl is also ejected. Therefore, the skin bowl forming die can not only make the skin bowl with uniform size and stable structure, but also simplify the operation process of making the skin bowl, and greatly improve the production efficiency of the skin bowl. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a sectional structure schematic view of the skin bowl forming die provided by the utility model.

[0016] Fig. 2 It is a sectional structure schematic view of the upper die of the skin bowl forming die provided by the utility model.

[0017] Fig. 3 It is a sectional structure schematic view of the lower die of the skin bowl forming die provided by the utility model.

[0018] Fig. 4 It is a sectional structure schematic view of the die core of the skin bowl forming die provided by the utility model. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the specific embodiments of the present invention. It should be understood that the description of the present invention herein is not intended to limit the scope of protection of the present invention.

[0020] like Figs. 1 to 4 As shown, it is a schematic structural diagram of a leather cup forming mold provided by the present invention. The leather cup forming mold includes an upper mold 10, a lower mold 20 fixedly arranged on one side of the upper mold 10, a mold core 30 accommodated in the lower mold 20 and elastically connected to the lower mold 20, an elastic connector 40 for connecting the mold core 30 and the lower mold 20, and at least two heating components 60 respectively arranged on the upper mold 10 and the lower mold 20 and used to heat the leather cup forming mold. It is conceivable that the leather cup forming mold should also include some other functional components, such as mounting components, assembly components, etc., which are all existing technologies well known to those skilled in the art and will not be elaborated here.

[0021] It should also be noted that the cup forming die is mounted on a punching machine, which is used to complete the forming of the cup forming die. The punching machine itself should be a prior art that converts circular motion into linear reciprocating motion to achieve extrusion or punching.

[0022] The upper die 10 includes an upper die body 11 mounted on the upper die base of the punching machine, a lower pressing protrusion 12 arranged on the side of the upper die body 11 facing the lower die 20, and a connecting shaft 13 arranged on the side of the upper die body 11 opposite to the lower pressing protrusion 12.

[0023] The upper die body 11 is matched with the lower die 20 and can be a cylindrical structure. It is connected to the upper die base (not shown) of the punching machine through the connecting shaft 13. When the leather cup forming mold is working, the upper die body 11 is pressed down by the punching machine, so that the downward pressing convex edge 12 is inserted between the die core 30 and the lower die 20, and cooperates with the lower die 20 and the die core 30 to press the disc-shaped material used to make the leather cup 50 into a bowl shape. It should be noted here that the disc-shaped material used to make the leather cup 50 can be extruded by an extruder. Since the extruder is an open device, the possibility of forming bubbles during extrusion is small. When a whole sheet of sheet material is extruded, the disc-shaped material for making the leather cup 50 is punched and formed.

[0024] The lower pressing protruding edge 12 is arranged on the side of the upper die body 11 facing the lower die 20 along the circumference of the upper die body 11. The lower pressing protruding edge 12 surrounds the end of the upper die body 11 to form a circular groove 14, and when the upper die 10 is pressed down, one end of the die core 30 is inserted into the circular groove 14, and the lower pressing protruding edge 12 is inserted into the space formed between the die core 30 and the lower die 20 to press the circular material sheet for making the leather bowl 50 into a bowl shape. This will be described in further detail below in combination with the die core 30.

[0025] The connecting shaft 13 is integrally formed with the upper die body 11, and the free end thereof is adapted to the punching machine and connected to the punching machine to provide driving force for the upper die 10 and control the pressing down and lifting up of the upper die 10.

[0026] The lower die 20 comprises a lower die body 21, a die core mounting hole 22 arranged on the lower die body 21, and an elastic connecting piece limiting hole 23 arranged on one side of the die core mounting hole 22.

[0027] The lower die body 21 is used for mounting the die core 30 and cooperates with the upper die 10 and the die core 30 to press and form the leather bowl 50 when the leather bowl 50 is made.

[0028] The die core mounting hole 22 is used for mounting the die core 30 and is located on the side of the lower die body 21 facing the upper die 10. The structure of the die core mounting hole 22 is consistent with the structure of the die core 30, which is in a T-shaped structure, and the end of the die core mounting hole 22 facing the upper die 10 penetrates through the lower die body 21, thereby facilitating the accommodation and mounting of the die core 30.

[0029] The elastic connecting piece limiting hole 23 is penetrated through between the die core mounting hole 22 and the elastic connecting piece 40 and is located on the side of the die core mounting hole 22 opposite to the upper die 10. One side of the elastic connecting piece limiting hole 23 is adapted to the elastic connecting piece 40 and communicates with the die core mounting hole 22. The diameter of the side of the elastic connecting piece limiting hole 23 opposite to the die core mounting hole 22 is greater than that of the side communicating with the die core mounting hole 22, thereby forming a limiting step between the die core mounting hole 22 and the elastic connecting piece limiting hole 23. One end of the elastic connecting piece 40 is clamped in the limiting step to form a limit during installation, thereby limiting the axial movement of the connecting screw 41 of the elastic connecting piece 40, thereby avoiding the disengagement of the die core 30 from the lower die 20 under the action of the spring 42 when the die core 30 is reset.

[0030] The mold core 30 comprises a mold core body 31, a guide cylinder 32 arranged on the side of the mold core body 31 opposite to the upper mold 10, a skin bowl forming part 33 arranged on the side of the mold core body 31 facing the upper mold 10, and an elastic connecting piece mounting hole 34 arranged in the middle of the mold core body 31.

[0031] The mold core body 31, the guide cylinder 32, and the skin bowl forming part 33 are integrally formed. The cross section of the mold core body 31 and the guide cylinder 32 is in T-shaped structure, and is consistent with the size of the mold core mounting hole 22. When the mold core 30 is accommodated in the mold core mounting hole 22, the mold core body 31 and the guide cylinder 32 respectively fit with the inner side walls of the side of the T-shaped structure of the mold core mounting hole 22 facing the upper mold 10 and the side of the elastic connecting piece limiting hole 23, thereby ensuring the position of the mold core body 31 fixed in the radial direction thereof and preventing the left and right movement of the mold core body 31 to cause the inconsistency of the thickness of the skin bowl around the skin bowl during the forming of the skin bowl.

[0032] The guide cylinder 32 is inserted into the mold core mounting hole 22 for guiding the mold core 30 to move up and down along the axial direction of the guide cylinder 32, and since the guide cylinder 32 fits with the mold core mounting hole 22, the stability of the mold core 30 is ensured.

[0033] The skin bowl forming part 33 corresponds to the circular groove 14 and is arranged at one end of the die core main body 31 towards the upper die 10. The diameter of the skin bowl forming part 32 is smaller than the diameter of the circular groove 14, and the diameter of the pressing protrusion 12 is smaller than the diameter of the die core mounting hole 22 towards the upper die 10, so that a uniform annular gap is formed between the skin bowl forming part 32 and the pressing protrusion 12, and between the pressing protrusion 12 and the lower die main body 21. The width of the gap is set according to the thickness requirement of the skin bowl 50. When the skin bowl 50 is made, a circular material sheet is calculated and made according to the size of the skin bowl 50, and then placed on the end face of the skin bowl forming part 32, and the upper die 10 is driven to press down, so that the skin bowl forming part 33 gradually inserts into the circular groove 14 until the skin bowl forming part 32 completely stops the circular material sheet at the bottom of the circular groove 14, and the pressing protrusion 12 completely inserts between the skin bowl forming part 32 and the lower die 20. The free end face of the pressing protrusion 12 and the die core main body 31 clamp the circular material sheet. During the pressing process, the end face of the skin bowl forming part 32 stops the circular material sheet on the upper die main body 11 to become the bottom of the skin bowl 50, and the circular material sheet is gradually stretched and wrapped on the pressing protrusion 12 during the pressing process of the pressing protrusion 12, so as to form the side wall of the skin bowl 50. It can be understood that after the skin bowl 50 is pressed and formed, the upper die 10 should be kept in the pressing state for a period of time, and the heating assembly 60 is turned off to cool the upper die 10 and the lower die 20. During the cooling process, the skin bowl 50 is cooled and shaped.

[0034] The elastic connecting part mounting hole 34 is used to arrange the elastic connecting part 40, so that the die core 30 can be elastically mounted in the die core mounting hole 22 along the axial direction of the die core mounting hole 22 through the elastic connecting part 40. The elastic connecting part mounting hole 34 includes a fixed hole 341 arranged on the die core main body 31, and a spring accommodating cavity 342 arranged at one end of the fixed hole 341 towards the elastic connecting part limiting hole 23. The fixed hole 341 is used to connect the die core main body 31 with the following screw rod 41. The spring accommodating cavity 342 is used to accommodate the following spring 42, which penetrates through the side of the die core main body 31 opposite to the skin bowl forming part 32, so as to install the spring 42.

[0035] The elastic connecting part 40 includes a connecting screw rod 41 used to connect the die core 30 and the lower die 20, and a spring 42 sleeved on the screw rod 41.

[0036] The connecting screw 41 is arranged in the fixed hole 341. When the mold core 30 is installed, one end of the connecting screw 41 is inserted into the elastic connecting member installation hole 34 from one side of the elastic connecting member limiting hole 23, and is screwed with the fixed hole 341, so as to connect the mold core 30 with the lower mold 20. A limiting nut can be arranged on the free end of the connecting screw 41, so that when the connecting screw 41 moves up and down along its axial direction, the nut cooperates with the elastic connecting member limiting hole 23 to pull the mold core 30, so as to avoid the mold core 30 from being separated from the lower mold 20 under the action of the spring 42. It is conceivable that by adjusting the limiting nut, the end face of the skin bowl forming part 33 can be flush with the end face of the lower mold body 21.

[0037] The spring 42 is accommodated in the spring accommodating cavity 342 and is sleeved on the connecting screw 41. The spring 42 is used to support the mold core 30. Specifically, when the spring 42 is in a free state, the end face of the skin bowl forming part 33 is flush with the end face of the lower mold body 21 under the support of the spring 42, so that the disc for making the skin bowl 50 can be placed flat on the skin bowl forming part 33. During the pressing process of the upper mold 10, the mold core 30 gradually compresses the spring 42 with the pressing of the upper mold 10, so that the mold core 30 gradually descends, thereby forming a gap between the skin bowl forming part 32 and the lower mold 20, and the disc placed on the skin bowl forming part 32 for making the skin bowl 50 is bent to form a bowl under the abutting of the pressing convex edge 12. During the pressing process, due to the elasticity of the spring 42, the skin bowl forming part 32 always abuts the disc material on the upper mold body 11, so as to ensure that the disc does not deviate during the pressing process. When the skin bowl 50 is formed, the upper mold 10 rises, and under the action of the elastic force of the spring 42, the mold core 30 is lifted upward until the end face of the skin bowl forming part 33 is flush with the end face of the lower mold body 21, so as to push out the formed skin bowl 50.

[0038] The heating assembly 60 includes at least two heating rod installation holes 61 arranged on the upper mold 10 and the lower mold 20 respectively, and at least two heating rods 62 accommodated in the heating rod installation holes 61 respectively.

[0039] The shape and size of the heating rod installation hole 61 are matched with the shape and size of the heating rod 62, so as to facilitate the installation of the heating rod 62 in the heating rod installation hole 61, thereby heating the upper mold 10 and the lower mold 20, facilitating the pressing and forming of the skin bowl 50.

[0040] The heating rod 62 is installed in the upper die 10 and the lower die 20 through the heating rod mounting hole 61, for heating the upper die 10 and the lower die 20, so that the heated upper die 10 and the lower die 20 can heat the disc-shaped material for making the skin bowl 50 when pressing, so that the disc-shaped material becomes soft, thereby avoiding the disc-shaped material from being damaged by pulling during pressing. At the same time, the heated disc-shaped material is easier to shape, and after cooling, the disc-shaped material automatically returns to a hard state, so that the shaped skin bowl 50 is not easy to deform. The heating rod 62 can be made of an electric heating rod or other components with heating effect, and the number and specifications of the heating assembly 60 can be adjusted according to the forming temperature requirements of the skin bowl 50 made of different materials to heat the upper die 10 and the lower die 20, thereby meeting the heating requirements of different disc-shaped materials.

[0041] In summary, when making the skin bowl 50, first start the heating assembly 60 to preheat the upper die 10 and the lower die 20, and when the temperature of the upper die 10 and the temperature of the lower die 20 meet the requirements, turn off the heating assembly 60, place the circular material sheet made according to the size of the skin bowl 50 on the end face of the skin bowl forming part 32, and then drive the upper die 10 to press down. During the pressing process, the lower pressing protrusion 12 first abuts against the circular material sheet at the corresponding position of the core 30, and then gradually inserts into the annular separation groove between the inner side wall of the lower die 20 and the skin bowl forming part 32, thereby pressing the circular material sheet cut according to the size of the skin bowl 50 into a bowl shape. When the skin bowl 50 is formed, continue to maintain the pressing state of the upper die 10 for a period of time until the skin bowl 50 is cooled and shaped, thereby avoiding the soft deformation of the skin bowl 50 after being taken out due to incomplete cooling. Since the intervals between the skin bowl forming part 32 and the lower pressing protrusion 12, and between the lower pressing protrusion 12 and the lower die body 21 of the skin bowl forming die are consistent, the overall thickness of the pressed skin bowl 50 is uniform and consistent, and the interval width between the skin bowl forming part 32 and the lower pressing protrusion 12, and between the lower pressing protrusion 12 and the lower die body 21 can be adjusted to meet the production requirements of skin bowls 50 of different thicknesses. The size of the circular material sheet for making the skin bowl 50 can be accurately calculated according to the size of the skin bowl 50, thereby avoiding material waste while controlling the forming size of the skin bowl 50. Therefore, the skin bowl 50 made by the skin bowl forming die has uniform and controllable size, stable shape, and simplified operation process, greatly improving the production efficiency of the skin bowl.

[0042] Compared with the prior art, the leather bowl forming die comprises the upper die 10, the lower die 20, the die core 30 arranged in the lower die 20, and the heating assembly 60 arranged between the upper die 10 and the lower die 20 and used for heating the upper die 10 and the lower die 20. When the leather bowl 50 is manufactured, the upper die 10 and the lower die 20 are preheated by the heating assembly 60, then the upper die 10 is driven to press down the die core 30, so that the circular sheet material is directly pressed into a bowl shape according to the size of the leather bowl 50, and the pressing state of the upper die 10 is continuously maintained for a period of time after the leather bowl 50 is formed, until the leather bowl 50 is cooled and shaped, so that the leather bowl 50 is not deformed after being taken out due to incomplete cooling. Since the intervals between the lower pressing convex edges 12, the leather bowl forming part 32 and the lower die 20 are consistent, the thickness of the leather bowl body formed by the leather bowl forming die is uniform, the leather bowl 50 formed by the leather bowl forming die can be completed by one-time processing, the shaped leather bowl 50 is stable in structure and is not easy to deform. When the upper die 10 is removed, the spring 42 can also push out the formed leather bowl 50. Therefore, the leather bowl forming die can not only manufacture the leather bowl 50 which is uniform in size and stable in structure, but also simplifies the operation process of leather bowl manufacturing, and greatly improves the production efficiency of the leather bowl.

[0043] The above is only the preferred embodiment of the utility model, and is not used for limiting the protection scope of the utility model, and any modification, equivalent replacement or improvement within the utility model spirit is covered in the utility model claim scope.

Claims

1. A leather cup forming mold, characterized by: The leather cup forming mold includes an upper mold, a lower mold fixedly arranged on one side of the upper mold, a mold core accommodated in the lower mold and elastically connected to the lower mold, an elastic connecting piece for connecting the mold core and the lower mold, and at least two heating components respectively arranged on the upper mold and the lower mold and used to heat the leather cup forming mold, the upper mold includes an upper mold body, and a downward pressure convex edge arranged on the side of the upper mold body facing the lower mold, the lower mold includes a lower mold body, and a mold core mounting hole arranged on the lower mold body, the mold core includes a mold core body, a guide cylinder arranged on the side of the mold core body opposite to the upper mold, and a leather cup forming portion arranged on the side of the mold core body facing the upper mold. , and an elastic connector mounting hole arranged in the middle of the mold core body, the elastic connector elastically mounts the mold core in the mold core mounting hole along the axial direction through the elastic connector mounting hole, the lower pressing convex edge forms a circular groove around the end of the upper mold body, the diameter of the leather bowl forming part is smaller than the diameter of the circular groove, the diameter of the lower pressing convex edge is smaller than the diameter of the mold core mounting hole, so that an annular spacing groove with consistent spacing is formed between the leather bowl forming part and the lower pressing convex edge, and between the lower pressing convex edge and the lower mold body, when the upper mold is pressed down, the leather bowl forming part is inserted into the circular groove formed by the lower pressing convex edge, and the lower pressing convex edge is inserted between the leather bowl forming part and the lower mold, pressing the circular material sheet placed on the leather bowl forming part into a bowl shape.

2. The leather cup forming mold according to claim 1, characterized in that: The mold core body, the guide cylinder, and the leather cup forming portion are integrally formed, and the cross-sections of the mold core body and the guide cylinder form a T-shaped structure.

3. The leather cup forming mold according to claim 2, characterized in that: The shape of the mold core mounting hole is adapted to the shape of the mold core, and the outer side walls of the mold core body and the guide cylinder are both fitted with the inner side walls of the mold core mounting hole.

4. The leather cup forming mold according to claim 1, characterized in that: The elastic connecting member includes a connecting screw rod for connecting the mold core and the lower mold, and a spring sleeved on the screw rod.

5. The leather cup forming mold according to claim 4, characterized in that: The elastic mounting hole includes a fixing hole arranged on one side of the mold core body, and a spring accommodating cavity arranged at one end of the fixing hole.

6. The leather cup forming mold according to claim 5, characterized in that: The connecting screw is adapted to fit the fixing hole. When the mold core is installed, one end of the connecting screw is inserted into the elastic connector mounting hole from one side of the elastic connector limiting hole and is screwed together with the fixing hole.

7. The leather cup forming mold according to claim 4, characterized in that: The length of the connecting screw is such that the end surface of the leather cup forming portion is flush with the end surface of the lower mold body when the spring is in a free state, that is, not compressed.

8. The leather cup forming mold according to claim 5, characterized in that: The spring is accommodated in the spring accommodating cavity and sleeved on the connecting screw.

9. The leather cup forming mold according to claim 1, characterized in that: The heating assembly includes at least two heating rod mounting holes respectively arranged on the upper mold and the lower mold, and at least two heating rods respectively accommodated in the heating rod mounting holes.

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