A micro-exhaust small-sized leather cup borderless mold

Abstract

The present invention provides a micro-exhaust small-size cup-shaped mold without a border, which includes an upper mold, a middle mold, a lower mold and an injection plug assembly. The upper mold includes an upper template. An upper assembly groove is formed at the top end of the upper template. An injection plug assembly extending into the upper assembly groove is arranged above the upper template. The bottom of the upper assembly groove is penetrated with an upper mold cavity. An upper mold insert is arranged in the upper mold cavity. An upper mold core rotatably sleeved outside the upper mold insert is also arranged in the upper mold cavity. The middle mold includes a middle template. The middle template is located below the upper template. A lower assembly groove is formed at the bottom end of the middle template. The bottom of the lower assembly groove is penetrated with a middle mold cavity. Middle mold cores are arranged in the middle mold cavity. The lower mold includes a lower template. The lower template is located below the middle template. A lower mold cavity is penetrated through the lower template. A lower mold core is arranged in the lower mold cavity. The lower template extends into the lower assembly groove, and a cavity is formed by the cooperation among the upper mold core, the middle mold core and the lower mold core. The present invention ensures that there is no waste rubber edge in the production process of the product, reduces the trimming cost in the subsequent process and improves the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cup leather molds, and particularly relates to a micro-exhaust small-size cup leather borderless mold. Background Art

[0002] The sealing cup leather for automobiles is mainly characterized by its small size, high sealing performance requirements, and no waste chips can be generated in the product use environment. Most of the existing molds adopt the way of punching the edge, but the efficiency is relatively low, and the proportion of product scrapping caused by punching the edge increases, resulting in an increase in cost. Summary of the Invention

[0003] Based on the technical problems existing in the background art, the present invention proposes a micro-exhaust small-size cup leather borderless mold.

[0004] A micro-exhaust small-size cup leather borderless mold proposed by the present invention includes an upper mold, a middle mold, a lower mold and an injection plug assembly, wherein:

[0005] The upper mold includes an upper template. An upper assembly groove is opened at the top end of the upper template. An injection plug assembly extending into the upper assembly groove is arranged above the upper template. An upper mold cavity is vertically penetrated through the bottom of the upper assembly groove. An upper mold insert is arranged in the upper mold cavity. An upper mold core rotatably sleeved outside the upper mold insert is also arranged in the upper mold cavity.

[0006] The middle mold includes a middle template. The middle template is located below the upper template. A lower assembly groove is opened at the bottom end of the middle template. A middle mold cavity is vertically penetrated through the bottom of the lower assembly groove. A middle mold core is arranged in the middle mold cavity.

[0007] The lower mold includes a lower template. The lower template is located below the middle template. A lower mold cavity is penetrated through the lower template. A lower mold core is arranged in the lower mold cavity.

[0008] In the mold closing state, the lower template extends into the lower assembly groove, and the upper mold core, the middle mold core and the lower mold core cooperate to form a cavity.

[0009] Preferably, the injection plug assembly includes an injection plug plate, a pressing plate and an elastic plate which are sequentially connected up and down. The injection plug plate is located above the upper template. A plurality of first guide columns are arranged at the bottom end of the injection plug plate. A plurality of first positioning holes are penetrated through the upper template. A plurality of second positioning holes are opened at the top end of the middle template, and the plurality of second positioning holes are respectively arranged in one-to-one correspondence with the plurality of first positioning holes. First guide sleeves are installed in the first positioning holes. The bottom ends of the plurality of first guide columns respectively penetrate through the plurality of guide sleeves and respectively extend into the plurality of second positioning holes, and the first guide columns are slidably connected with the first guide sleeves in a matching manner; the pressing plate and the elastic plate are both arranged in the upper assembly groove. A copper insert is sleeved outside the pressing plate. The copper insert is attached to the inner wall of the upper assembly groove, and the bottom end of the copper insert abuts against the elastic plate.

[0010] Preferably, upper retaining rings, middle retaining rings, and lower retaining rings are respectively sleeved outside the upper die core, the middle die core, and the lower die core, and the upper retaining rings, the middle retaining rings, and the lower retaining rings are all provided with two layers; upper card slots, middle card slots, and lower card slots are respectively formed on the inner walls of the upper die cavity, the middle die cavity, and the lower die cavity, and the upper retaining rings, the middle retaining rings, and the lower retaining rings are respectively movably clamped in the upper card slots, the middle card slots, and the lower card slots.

[0011] Preferably, a vertically arranged first positioning groove is formed on the outer periphery of the upper die insert, a positioning pin is arranged in the first positioning groove, a second positioning groove for the positioning pin to be inserted into is formed on the inner peripheral surface of the upper die core, and the upper die core and the upper die insert are rotationally fitted with a clearance of 0.009 - 0.011 mm.

[0012] Preferably, a first horizontal plane is arranged at the bottom end of the upper die core outside the cavity, the top end of the middle die core has a first inclined surface that slopes from the middle to its outer periphery, the inner circumference of the first inclined surface is in line contact with the first horizontal plane and the other parts of the first inclined surface are in clearance fit with the first horizontal plane, and the inclination angle of the first inclined surface is 0.013° - 0.016°.

[0013] Preferably, a second horizontal plane is arranged at the bottom end of the upper die insert inside the cavity, the top end of the lower die core has a second inclined surface that slopes from the outer periphery to the middle, the outer circumference of the second inclined surface is in line contact with the second horizontal plane and the other parts of the second inclined surface are in clearance fit with the second horizontal plane, and the inclination angle of the second inclined surface is 0.013° - 0.016°.

[0014] Preferably, a third inclined surface that slopes from top to bottom and outwards is arranged outside the lower die core below the cavity, a fourth inclined surface that slopes from top to bottom and outwards is arranged inside the middle die core below the cavity, the end of the third inclined surface close to the cavity is in line contact with the end of the fourth inclined surface close to the cavity and the other parts of the third inclined surface are in clearance fit with the fourth inclined surface, and the angle difference between the third inclined surface and the fourth inclined surface is 0.04° - 0.06°.

[0015] Preferably, the top surface of the lower die core is in mating contact with the bottom surface of the upper die insert, and a sine - wave - shaped exhaust groove communicating with the cavity is formed on the top surface of the lower die core. The depth of the sine - wave - shaped exhaust groove is 0.0015 - 0.003 mm, and the width of the sine - wave - shaped exhaust groove is 0.01 - 0.015 mm.

[0016] Preferably, the upper template and the middle template are in clearance fit and the width of the clearance is 0.24 - 0.26 mm, and the middle template and the lower template are in clearance fit and the width of the clearance is 0.19 - 0.21 mm.

[0017] Preferably, the lower die further includes a lower backing plate located below the lower template, and the lower backing plate is fixedly connected to the lower template; a plurality of second guide posts are provided at the bottom end of the upper template, a plurality of third positioning holes are formed through the middle template, second guide sleeves are arranged in the third positioning holes, a plurality of fourth positioning holes are formed through the lower backing plate and the plurality of fourth positioning holes are respectively arranged in one-to-one correspondence with the plurality of third positioning holes, the bottom ends of the plurality of second guide posts respectively penetrate through the plurality of second guide sleeves and respectively extend into the plurality of fourth positioning holes, and the second guide posts are slidably matched with the second guide sleeves; a plurality of third guide posts are provided on the lower backing plate, a plurality of fifth positioning holes are formed through the middle template and third guide sleeves are arranged in the fifth positioning holes, a plurality of sixth positioning holes are formed in the upper template and the plurality of sixth positioning holes are respectively arranged in one-to-one correspondence with the plurality of fifth positioning holes, the top ends of the plurality of third guide posts respectively penetrate through the plurality of third guide sleeves and respectively extend into the plurality of sixth positioning holes, and the third guide posts are slidably matched with the third guide sleeves.

[0018] A micro-exhaust small-size cup leather cup borderless mold proposed by the present invention is divided into four major parts: a plunger assembly, an upper die, a middle die, and a lower die; the upper die insert and the upper die core adopt a dynamic fit, so that the entire mold cavity is uniformly stressed during injection molding, and the pressure between the outer and inner sides of the product is kept consistent; the upper die core and the upper template are dynamically connected by means of a double-layer upper snap ring, the middle die core is dynamically connected to the middle template by means of a double-layer middle snap ring, and the lower die core is dynamically connected to the lower template by means of a double-layer lower snap ring. The self-positioning method of the mold itself is adopted to ensure that no flash phenomenon occurs in the product; the gap between the upper template and the middle template is about 0.25 mm, and the gap between the middle template and the lower template is about 0.2 mm. Mainly, during the production process, it is sealed by the self-positioning method of the upper die, the middle die, the lower die, and the upper die insert. The gap is left mainly to ensure that the template does not interfere with the production; the sealing method of inclined plane line contact is adopted at the mating part between the upper die core and the middle die core, which can effectively avoid flash at the outer peripheral parting of the product; the sealing method of inclined plane line contact is adopted at the mating part between the upper die insert and the lower die core, which can effectively avoid flash on the inner circle of the product; the mating part between the middle die core and the lower die core adopts a small interference misalignment angle method of profiling grinding to avoid flash at the lower parting of the product; a sine wave-shaped exhaust groove is machined on the lower die core parting surface at the parting of the lower die core and the upper die insert, which can not only exhaust the air in the mold cavity during injection molding, but also prevent the overflow of the rubber material during injection molding, achieving a balanced effect of both. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of a micro-exhaust small-size cup leather cup borderless mold proposed by the present invention;

[0020] Figure 2 is another cross-sectional view of a micro-exhaust small-size cup leather cup borderless mold proposed by the present invention;

[0021] Figure 3The assembly structure diagram of the upper die core, middle die core and lower die core in a micro-exhaust small-size cup leather bowl borderless mold proposed by the present invention;

[0022] Figure 4 is Figure 3 the sectional view taken along the A-A direction in

[0023] Figure 5 is Figure 3 the sectional view taken along the B-B direction in

[0024] Figure 6 is Figure 4 the enlarged view at D in

[0025] Figure 7 is Figure 4 the enlarged view at C in

[0026] Figure 8 is Figure 7 the enlarged view at F in

[0027] Figure 9 is Figure 4 the enlarged view at E in

[0028] Figure 10 The structural schematic diagram of the lower die core in a micro-exhaust small-size cup leather bowl borderless mold proposed by the present invention;

[0029] Figure 11 The partial structural schematic diagram of the sine-wave exhaust groove in a micro-exhaust small-size cup leather bowl borderless mold proposed by the present invention. Specific embodiments

[0030] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is made with reference to the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Referring to Figures 1 - 11 , the present invention proposes a micro-exhaust small-size cup leather bowl borderless mold, including an upper die, a middle die and a lower die, wherein:

[0032] The upper die includes an upper template 1. An upper assembly groove is opened at the top end of the upper template 1. A pouring plug assembly extending into the upper assembly groove is arranged above the upper template 1. An upper die cavity is penetrated through the bottom of the upper assembly groove. An upper die insert 2 is arranged in the upper die cavity. An upper die core 3 rotatably sleeved outside the upper die insert 2 is also arranged in the upper die cavity. An upper snap ring 14 is sleeved outside the upper die core 3. The upper snap ring 14 is provided with two layers. An upper snap groove is opened on the inner wall of the upper die cavity. The upper snap ring 14 is movably clamped in the upper snap groove.

[0033] The middle mold includes a middle template 4, which is located below the upper template 1. A lower assembly groove is provided at the bottom end of the middle template 4, and a middle mold cavity is penetrated through the bottom of the lower assembly groove. Middle mold cores 5 are arranged in the middle mold cavity. The middle mold cores 5 are sleeved with middle snap rings 15. There are two layers of middle snap rings 15. Middle snap grooves are provided on the inner wall of the middle mold cavity, and the middle snap rings 15 are movably clamped in the middle snap grooves.

[0034] The lower mold includes a lower template 6, which is located below the middle template 4. A lower mold cavity is penetrated through the lower template 6. A lower mold core 7 is arranged in the lower mold cavity. The lower mold core 7 is sleeved with a lower snap ring 16. There are two layers of lower snap rings 16. Lower snap grooves are provided on the inner wall of the lower mold cavity, and the lower snap rings 16 are movably clamped in the lower snap grooves.

[0035] In the mold closing state, the lower template 6 extends into the lower assembly groove, and a cavity 8 is formed by the cooperation among the upper mold core 3, the middle mold core 5, and the lower mold core 7. There is a clearance fit between the upper template 1 and the middle template 4, and the width of this clearance is 0.25 mm. There is a clearance fit between the middle template 4 and the lower template 6, and the width of this clearance is 0.20 mm.

[0036] The borderless mold proposed in this embodiment is structurally divided into four major parts: a plunger assembly, an upper mold, a middle mold, and a lower mold. A total of 55 mold cavities 8 are formed in the mold, effectively improving the efficiency. The upper mold insert 2 and the upper mold core 3 adopt a dynamic fit, so that the entire mold cavity is uniformly stressed during injection molding, and the matching pressure between the outer and inner sides of the product remains consistent. The upper mold core 3 and the upper template 1 are dynamically connected by means of a double-layer upper snap ring 14. The middle mold core 5 is dynamically connected to the middle template 4 by means of a double-layer middle snap ring 15. The lower mold core 7 is dynamically connected to the lower template 6 by means of a double-layer lower snap ring 16. The self-positioning method of the mold itself is adopted to ensure that no flash phenomenon occurs in the product. The clearance between the upper template 1 and the middle template 4 is about 0.25 mm, and the clearance between the middle template 4 and the lower template 6 is about 0.2 mm. The main reason is that during the production process, the upper mold, middle mold, lower mold, and upper mold insert are self-positioned for sealing. The clearance left here is mainly to ensure that the templates do not interfere with the production.

[0037] In this embodiment, as Figure 1As shown in the figure, the plunger assembly includes a plunger plate 9, a pressure plate 10, and an elastic plate 11 arranged vertically. The plunger plate 9, the pressure plate 10, and the elastic plate 11 are connected by a method of fixing with screws and then welding. The plunger plate 9 is located above the upper template 1. A plurality of first guide posts 20 are provided at the bottom end of the plunger plate 9. A plurality of first positioning holes are penetrated through the upper template 1. A plurality of second positioning holes are provided at the top end of the middle template 4, and the plurality of second positioning holes are respectively arranged in one-to-one correspondence with the plurality of first positioning holes. First guide sleeves 21 are installed in the first positioning holes. The bottom ends of the plurality of first guide posts 20 respectively penetrate through the plurality of guide sleeves and extend into the plurality of second positioning holes, and the first guide posts 20 are slidably connected with the first guide sleeves 21. The pressure plate 10 and the elastic plate 11 are both arranged in the upper assembly groove. A copper insert 12 is sleeved on the outer periphery of the pressure plate 10. The copper insert 12 is attached to the inner wall of the upper assembly groove, and the bottom end of the copper insert 12 abuts against the elastic plate 11. The plunger assembly adopts the method of using a copper insert 12 to avoid the phenomenon of glue overflow during the production process and avoid the jamming phenomenon caused by the unstable thermal expansion between the plunger and the cup. The plunger adopts the method of using a copper insert. The lubrication performance of copper is higher than that of die steel, and the production process is smooth.

[0038] In this embodiment, as Figure 1 , Figure 2 shown, the lower die further includes a lower backing plate 13 located below the lower template 6, and the lower backing plate 13 is fixedly connected to the lower template 6. A plurality of second guide posts 22 are provided at the bottom end of the upper template 1. A plurality of third positioning holes are penetrated through the middle template 4. Second guide sleeves 23 are arranged in the third positioning holes. A plurality of fourth positioning holes are penetrated through the lower backing plate 13, and the plurality of fourth positioning holes are respectively arranged in one-to-one correspondence with the plurality of third positioning holes. The bottom ends of the plurality of second guide posts 22 respectively penetrate through the plurality of second guide sleeves 23 and extend into the plurality of fourth positioning holes, and the second guide posts 22 are slidably connected with the second guide sleeves 23. A plurality of third guide posts 24 are provided on the lower backing plate 13. A plurality of fifth positioning holes are penetrated through the middle template 4, and third guide sleeves 25 are arranged in the fifth positioning holes. A plurality of sixth positioning holes are provided in the upper template 1, and the plurality of sixth positioning holes are respectively arranged in one-to-one correspondence with the plurality of fifth positioning holes. The top ends of the plurality of third guide posts 24 respectively penetrate through the plurality of third guide sleeves 25 and extend into the plurality of sixth positioning holes, and the third guide posts 24 are slidably connected with the third guide sleeves 25.

[0039] Furthermore, as Figure 5As shown in the figure, a first positioning groove 18 arranged vertically is provided on the outer periphery of the upper die insert 2. A positioning pin 17 is arranged in the first positioning groove 18. A second positioning groove 19 for the positioning pin 17 to be inserted into is provided on the inner peripheral surface of the upper die core 3. And the upper die core 3 and the upper die insert 2 are in rotational fit with a clearance of 0.01 mm. The upper die insert 2 and the upper die core 3 are connected by the positioning pin 17 to prevent misalignment caused by self-rotation. The upper die insert 2 and the upper die core 3 are in dynamic fit, so that the inner and outer pressure-bearing surfaces of the product are evenly stressed during injection molding. Originally, the upper die core 3 and the upper die insert could be integrated. However, considering the high requirements of the borderless mold, if they are integrated, it may cause inconsistent inner and outer rubber edges of the product, and then the effect of no rubber edge cannot be controlled. The upper die insert 2 and the upper die core 3 are in a fit of 0.01 mm, which can neither generate rubber edges nor allow relative movement between the two, meeting the design requirements.

[0040] Further, as Figure 4 , Figure 7 , Figure 8 shown, a first horizontal plane 3a is provided at the bottom end of the upper die core 3 on the outer periphery of the cavity 8. The top end of the middle die core 5 has a first inclined surface 5a that slopes from the middle to its outer periphery. The inner circumference of the first inclined surface 5a is in line contact with the first horizontal plane 3a, and the other parts of the first inclined surface 5a are in clearance fit with the first horizontal plane 3a. The inclination angle of the first inclined surface 5a is 0.015°. The upper die core 3 and the middle die core 5 are in a sealing manner with line contact on the inclined surface at the mating part, which can effectively avoid generating rubber edges at the outer peripheral parting line of the product.

[0041] Further, as Figure 4 , Figure 6 shown, a second horizontal plane 2a is provided at the bottom end of the upper die insert 2 on the inner periphery of the cavity 8. The top end of the lower die core 7 has a second inclined surface 7a that slopes from the outer periphery to its middle. The outer circumference of the second inclined surface 7a is in line contact with the second horizontal plane 2a, and the other parts of the second inclined surface 7a are in clearance fit with the second horizontal plane 2a. The inclination angle of the second inclined surface 7a is 0.015°. The upper die insert 2 and the lower die core 7 are in a sealing manner with line contact on the inclined surface at the mating part, which can effectively avoid generating rubber edges on the inner circle of the product. The mating surface of the lower die core 7 is at the edge of the inner parting line of the product, which is convenient for machining the inclined surface. Here, the inclined surface with an inclination of 0.015° is machined by a profiling grinder, which is convenient for pressing and sealing the rubber edge in a circumferential line contact manner after mold closing to prevent the rubber material from overflowing.

[0042] Further, as Figure 4 , Figure 9As shown in the figure, a third inclined surface 7b that slopes outward from top to bottom is provided below the cavity 8 on the outer side of the lower die core 7, and a fourth inclined surface 5b that slopes outward from top to bottom is provided below the cavity 8 on the inner side of the middle die core 5. One end of the third inclined surface 7b close to the cavity 8 is in line contact with one end of the fourth inclined surface 5b close to the cavity 8, and the other parts of the third inclined surface 7b are in clearance fit with the fourth inclined surface 5b. The angle difference between the third inclined surface 7b and the fourth inclined surface 5b is 0.05°. The mating part of the middle die core 5 and the lower die core 7 adopts the method of small interference misalignment angle by profiling grinding to avoid the generation of flash at the lower part of the product during parting. The inclined surface angles are matched with a misalignment angle of 0.05° at this position during parting, and an elastic interference of 0.04 at the sealing port is adopted during the grinding fit process. Therefore, during the production process, the elastic deformation under pressure is used for sealing at the parting surface, which is very perfect.

[0043] Further, as Figure 10 , Figure 11 shown in the figure, the top surface 7c of the lower die core 7 is in mating contact with the bottom surface of the upper die insert 2, and a sine-wave-shaped exhaust groove communicating with the cavity 8 is provided on the top surface 7c of the lower die core 7. The depth of the sine-wave-shaped exhaust groove is 0.0015 - 0.003 mm, and the width of the sine-wave-shaped exhaust groove is 0.01 - 0.015 mm. A sine-wave-shaped exhaust groove is machined on the parting surface of the lower die core at the parting position between the lower die core 7 and the upper die insert 2 for exhausting the product, ensuring no defects at the inner circle of the product, maintaining the exhaust of the product without overflowing glue to generate flash.

[0044] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A micro-exhaust small-size cup leather bowl borderless mold, characterized in that, it includes an upper mold, a middle mold, a lower mold and an injection plug assembly, wherein: The upper mold includes an upper template. An upper assembly groove is provided at the top end of the upper template. An injection plug assembly extending into the upper assembly groove is arranged above the upper template; a through upper mold cavity is provided at the bottom of the upper assembly groove. An upper mold insert is arranged in the upper mold cavity, and an upper mold core rotatably sleeved outside the upper mold insert is also arranged in the upper mold cavity; The middle mold includes a middle template. The middle template is located below the upper template. A lower assembly groove is provided at the bottom end of the middle template. A through middle mold cavity is provided at the bottom of the lower assembly groove. Middle mold cores are arranged in the middle mold cavity; The lower mold includes a lower template. The lower template is located below the middle template. A through lower mold cavity is provided on the lower template. A lower mold core is arranged in the lower mold cavity; In the closed mold state, the lower template extends into the lower assembly groove and a cavity is formed by the cooperation among the upper mold core, the middle mold core and the lower mold core; The injection plug assembly includes an injection plug plate, a pressing plate and an elastic plate which are connected in sequence from top to bottom. The injection plug plate is located above the upper template. A plurality of first guide posts are provided at the bottom end of the injection plug plate. A plurality of first positioning holes are provided through the upper template. A plurality of second positioning holes are provided at the top end of the middle template and the plurality of second positioning holes are respectively arranged in one-to-one correspondence with the plurality of first positioning holes. First guide sleeves are installed in the first positioning holes. The bottom ends of the plurality of first guide posts respectively penetrate through the plurality of guide sleeves and respectively extend into the plurality of second positioning holes, and the first guide posts are slidably connected with the first guide sleeves in a sliding fit manner; the pressing plate and the elastic plate are both arranged in the upper assembly groove. A copper insert is sleeved outside the pressing plate. The copper insert is attached to the inner wall of the upper assembly groove and the bottom end of the copper insert abuts against the elastic plate; Upper retaining rings, middle retaining rings and lower retaining rings are respectively sleeved outside the upper mold core, the middle mold core and the lower mold core. The upper retaining rings, the middle retaining rings and the lower retaining rings are all provided with two layers; upper card slots, middle card slots and lower card slots are respectively provided on the inner walls of the upper mold cavity, the middle mold cavity and the lower mold cavity. The upper retaining rings, the middle retaining rings and the lower retaining rings are respectively movably clamped in the upper card slots, the middle card slots and the lower card slots.

2. The micro-exhaust small-size cup leather bowl borderless mold according to claim 1, characterized in that, a vertically arranged first positioning groove is provided on the outer periphery of the upper mold insert. A positioning pin is arranged in the first positioning groove. A second positioning groove for the positioning pin to be inserted into is provided on the inner peripheral surface of the upper mold core, and the upper mold core and the upper mold insert are rotatably fitted with a clearance of 0.009-0.011mm.

3. The micro-exhaust small-size cup leather bowl borderless mold according to claim 1, characterized in that, a first horizontal plane is provided at the bottom end of the upper mold core on the outer periphery of the cavity. The top end of the middle mold core has a first inclined surface inclined from the middle to its outer periphery. The inner circumference of the first inclined surface is in line contact with the first horizontal plane and the other parts of the first inclined surface are in clearance fit with the first horizontal plane. The inclination angle of the first inclined surface is 0.013°-0.016°.

4. The micro-exhaust small-size cup leather bowl borderless mold according to claim 1, characterized in that, a second horizontal plane is provided at the bottom end of the upper mold insert on the inner periphery of the cavity. The top end of the lower mold core has a second inclined surface inclined from the outer periphery to the middle thereof. The outer circumference of the second inclined surface is in line contact with the second horizontal plane and the other parts of the second inclined surface are in clearance fit with the second horizontal plane. The inclination angle of the second inclined surface is 0.013°-0.016°.

5. The micro-exhaust small-size leather cup borderless mold according to claim 1, characterized in that, a third inclined surface that slopes outward from top to bottom is provided at a position below the cavity on the outer side of the lower die core, and a fourth inclined surface that slopes outward from top to bottom is provided at a position below the cavity on the inner side of the middle die core. One end of the third inclined surface close to the cavity is in line contact with one end of the fourth inclined surface close to the cavity, and the other parts of the third inclined surface are in clearance fit with the fourth inclined surface. The angle difference between the third inclined surface and the fourth inclined surface is 0.04°-0.06°.

6. The micro-exhaust small-size leather cup borderless mold according to claim 1, characterized in that, the top surface of the lower die core is in mating contact with the bottom surface of the upper die insert, and a sine-wave-shaped exhaust groove communicating with the cavity is formed on the top surface of the lower die core. The depth of the sine-wave-shaped exhaust groove is 0.0015-0.003 mm, and the width of the sine-wave-shaped exhaust groove is 0.01-0.015 mm.

7. The micro-exhaust small-size leather cup borderless mold according to claim 1, characterized in that, there is a clearance fit between the upper template and the middle template, and the width of this clearance is 0.24-0.26 mm. There is a clearance fit between the middle template and the lower template, and the width of this clearance is 0.19-0.21 mm.

8. The micro-exhaust small-size leather cup borderless mold according to claim 1, characterized in that, the lower die further includes a lower backing plate located below the lower template, and the lower backing plate is fixedly connected to the lower template; a plurality of second guide posts are provided at the bottom end of the upper template, a plurality of third positioning holes are formed through the middle template, second guide sleeves are arranged in the third positioning holes, a plurality of fourth positioning holes are formed through the lower backing plate, and the plurality of fourth positioning holes are respectively arranged in one-to-one correspondence with the plurality of third positioning holes. The bottom ends of the plurality of second guide posts respectively penetrate through the plurality of second guide sleeves and respectively extend into the plurality of fourth positioning holes, and the second guide posts are in sliding fit with the second guide sleeves; a plurality of third guide posts are provided on the lower backing plate, a plurality of fifth positioning holes are formed through the middle template, third guide sleeves are arranged in the fifth positioning holes, a plurality of sixth positioning holes are formed in the upper template, and the plurality of sixth positioning holes are respectively arranged in one-to-one correspondence with the plurality of fifth positioning holes. The top ends of the plurality of third guide posts respectively penetrate through the plurality of third guide sleeves and respectively extend into the plurality of sixth positioning holes, and the third guide posts are in sliding fit with the third guide sleeves.

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