A molding die for hoses

Abstract

This invention provides a molding die for rubber hoses, including an upper mold plate and a lower mold plate, which are connected by guide pillars. A mold core is connected between the upper and lower mold plates. The upper mold plate has an upper mold cavity near the lower mold plate, and the lower mold plate has a lower mold cavity near the upper mold plate. The upper and lower mold cavities abut against each other to form a molding cavity. The mold core is connected between the upper and lower mold cavities, and a positioning mechanism is connected to the lower mold cavity. The mold core is connected to the lower mold cavity through the positioning mechanism. This invention ensures the positioning accuracy of the mold core through the positioning mechanism, preventing the mold core from shifting during the molding process, ensuring the quality of the silicone rubber hose. At the same time, the step-by-step process allows for flexible adjustment of vulcanization parameters, improving production flexibility and efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of silicone rubber tube production technology, specifically relating to a molding die for rubber tubes. Background Technology

[0002] Silicone rubber tubing, as a high-performance elastic material, is widely used in automotive, medical, and electronics industries. Current mainstream molding methods for silicone rubber tubing include compression molding, extrusion molding, and injection molding. Compression molding is further divided into simultaneous molding and vulcanization, and step-by-step vulcanization (molding first, vulcanization later). The molding-first-then-vulcanization process is suitable for thick-walled products, using external vulcanization equipment, eliminating reliance on mold heating, and allowing for extended vulcanization time based on the tubing wall thickness to ensure complete internal vulcanization and avoid under-vulcanization. In step-by-step vulcanization, to prevent deformation during vulcanization, the tubing and mold core must be placed together in the vulcanization device. Compression molding of another silicone rubber tubing requires a separate mold core; existing mold cores lack sufficient positioning support, are prone to displacement, are inconvenient to replace, and affect the quality of the silicone rubber tubing.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a molding die for rubber hoses, which avoids displacement of the mold core 3 during the molding process, ensures the quality of silicone rubber hoses, and the step-by-step process can flexibly adjust the vulcanization parameters, thereby improving production flexibility and efficiency.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a molding die for rubber hoses, including an upper mold plate and a lower mold plate, which are connected by guide pillars. A mold core is connected between the upper and lower mold plates. The upper mold plate has an upper mold cavity on the side near the lower mold plate, and the lower mold plate has a lower mold cavity on the side near the upper mold plate. The upper and lower mold cavities abut against each other to form a molding cavity. The mold core is connected between the upper and lower mold cavities, and a positioning mechanism is connected to the lower mold cavity. The mold core is connected to the lower mold cavity through the positioning mechanism. This invention relates to the compression molding of silicone rubber tubes. During production, a molding machine drives the upper and lower mold plates to separate. A pre-formed silicone rubber sheet is placed in the lower mold cavity. The mold core is connected to the lower mold cavity via a positioning mechanism. The pre-formed silicone rubber sheet is then placed on top of the mold core and the lower mold plate, ensuring the silicone rubber sheet fully covers the mold core. The molding machine drives the upper mold plate to move along the guide post towards the lower mold plate. The upper and lower mold plates close, and the silicone rubber sheet is molded within the molding cavity formed by the upper and lower mold plates. Then, the upper and lower mold plates separate, and the molded silicone rubber tube and mold core are removed together and placed in a vulcanization device for vulcanization. Residual material is removed. The above steps are repeated to produce silicone rubber tubes. This invention ensures the positioning accuracy of the mold core through the positioning mechanism, preventing displacement of the mold core during molding and ensuring the quality of the silicone rubber tube. Simultaneously, the step-by-step process allows for flexible adjustment of vulcanization parameters, improving production flexibility and efficiency.

[0006] Furthermore, in the aforementioned molding die for hoses, the positioning mechanism includes a bolt and a spring. The lower mold cavity has a countersunk hole, into which the bolt passes. A nut is connected to one end of the bolt passing through the lower mold, and the nut is slidably connected within the countersunk hole in the lower mold. A spring is sleeved on the outside of the bolt, with its upper end abutting against the bolt head and its lower end abutting against the countersunk head within the countersunk hole. A positioning hole is provided on the lower side of the mold core, corresponding to the countersunk hole, and the inner diameter of the positioning hole corresponds to the outer diameter of the bolt head. During molding, the bolt head extends into the positioning hole. When the mold core is installed in the lower mold cavity, the bolt head extends into the positioning hole, positioning the mold core and preventing displacement, thus improving the production yield. During mold core installation, if the bolt head is not aligned with the positioning hole, the mold core presses down on the bolt head, compressing the spring and retracting the bolt head into the countersunk hole. When the bolt head aligns with the positioning hole, the spring releases, and the bolt head extends into the positioning hole, thus achieving positioning. The above settings improve the convenience of mold core positioning and installation.

[0007] Furthermore, in the aforementioned molding die for the rubber hose, the bolt shank includes a pin portion and a threaded portion, which are integrally formed. The outer diameter of the pin portion corresponds to the inner diameter of the bottom hole of the countersunk through hole, and the pin portion is slidably connected within the bottom hole of the countersunk through hole. When the bolt is compressed, the pin portion slides along the bottom hole of the countersunk through hole, improving the bolt positioning accuracy, thereby improving the positioning accuracy of the mold core and the quality of the silicone rubber hose.

[0008] Furthermore, in the aforementioned molding die for hoses, a positioning ring is provided at one end of the mold core, and the positioning ring is arranged around the side wall of the mold core. The upper mold cavity has an upper positioning groove, and the lower mold cavity has a lower positioning groove, with the upper and lower positioning grooves corresponding to the positioning ring. When the mold is closed, the upper and lower sides of the positioning ring are connected to the upper and lower positioning grooves, respectively. The positioning ring connected to the upper and lower positioning grooves provides axial positioning for the mold core, preventing the mold core from shifting.

[0009] Furthermore, in the aforementioned molding die for hoses, the top of the positioning ring is provided with an upper positioning platform, and the bottom of the positioning ring is provided with a lower positioning platform, which are arranged horizontally and parallel to each other. The upper positioning groove corresponds to the upper positioning platform, and the lower positioning groove corresponds to the lower positioning platform. During mold closing, the bottom surfaces of the lower positioning platform and the lower positioning groove abut against each other, and the bottom surfaces of the upper positioning platform and the upper positioning groove abut against each other. The upper and lower positioning platforms provide radial positioning for the mold core, preventing mold core flipping and improving positioning accuracy.

[0010] Furthermore, in the aforementioned molding die for hoses, the upper mold plate cavity includes an upper support cavity and an upper forming cavity, with the upper support cavity integrally connected to both ends of the upper forming cavity; the lower mold plate cavity includes a lower support cavity and a lower forming cavity, with the lower support cavity integrally connected to both ends of the lower forming cavity. During mold closing, the upper and lower support cavities abut against both ends of the mold core, while the upper and lower forming cavities maintain a gap with the mold core. An upper positioning groove is located in the upper support cavity, and a lower positioning groove is located in the lower support cavity.

[0011] Furthermore, in the aforementioned molding die for the rubber hose, an upper cutting groove is provided along the outer periphery of the upper molding cavity, and a lower cutting groove is provided along the lower molding cavity. The upper and lower cutting grooves are correspondingly provided. When the mold is closed, the upper and lower cutting grooves abut against each other. The upper and lower cutting grooves respectively form cutting edges along the upper and lower molding cavities. The abutment of the upper and lower cutting grooves removes residual material from the silicone rubber hose, reducing subsequent processes and improving production efficiency.

[0012] Furthermore, in the aforementioned molding die for the hose, an upper limit plate is connected to the side of the upper mold plate, and the upper limit plate is located at the end of the upper mold plate cavity away from the upper positioning groove. A lower limit plate is connected to the side of the lower mold plate, and the lower limit plate is located at the end of the lower mold plate cavity away from the lower positioning groove. When the mold is closed, the upper limit plate and the lower limit plate abut against the end of the mold core away from the positioning ring, respectively. The upper limit plate and the lower limit plate provide limiting for the mold core, and together with the positioning ring, form a double constraint on the mold core, improving the positioning accuracy of the mold core.

[0013] Furthermore, in the aforementioned molding die for hoses, the upper mold plate is connected to a top plate at the end furthest from the lower mold plate, and the lower mold plate is connected to a bottom plate at the end furthest from the upper mold plate.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects: This utility model is used for molding dies for rubber hoses. The positioning mechanism ensures the positioning accuracy of the mold core, preventing displacement of the mold core during molding and ensuring the quality of the silicone rubber hose. Simultaneously, the step-by-step process allows for flexible adjustment of vulcanization parameters, improving production flexibility and efficiency. The bolts are elastically connected within the countersunk through-hole, improving the convenience of mold core positioning and installation. The upper and lower grooves remove residual material, improving production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the molding die used for rubber hoses according to this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the lower template;

[0017] Figure 3 This is a schematic diagram of the structure of the upper template;

[0018] Figure 4 This is a schematic diagram of the structure of the mold core;

[0019] Figure 5 This is a schematic diagram of the bolt's structure;

[0020] Figure 6 for Figure 4 The bottom view of the mold core shown;

[0021] Figure 7 This is a bottom view of the upper template;

[0022] Figure 8 for Figure 7 Enlarged view of a specific area;

[0023] Figure 9 This is a top view of the lower template;

[0024] Figure 10 for Figure 9 Enlarged view of a specific area.

[0025] In the diagram: 1. Upper template, 11. Upper template cavity, 111. Upper positioning groove, 112. Upper support cavity, 113. Upper forming cavity, 1131. Upper cutting groove, 12. Upper limit plate, 2. Lower template, 21. Lower template cavity, 211. Lower positioning groove, 212. Lower support cavity, 213. Lower forming cavity, 2131. Lower cutting groove, 22. Countersunk through hole, 23. Lower limit plate, 3. Mold core, 31. Positioning hole, 32. Positioning ring, 321. Upper positioning platform, 322. Lower positioning platform, 4. Positioning mechanism, 41. Bolt, 411. Pin shaft part, 412. Threaded part, 42. Spring, 5. Top plate, 6. Bottom plate. Detailed Implementation

[0026] Example 1

[0027] like Figure 1-4 The mold shown is for molding rubber hoses, including an upper mold plate 1 and a lower mold plate 2. The upper mold plate 1 and the lower mold plate 2 are connected by guide pillars. A mold core 3 is connected between the upper mold plate 1 and the lower mold plate 2. The upper mold plate 1 has an upper mold cavity 11 near the lower mold plate 2, and the lower mold plate 2 has a lower mold cavity 21 near the upper mold plate 1. The upper mold cavity 11 and the lower mold cavity 21 abut against each other to form a molding cavity. The mold core 3 is connected between the upper mold cavity 11 and the lower mold cavity 21. The lower mold cavity 21 is connected to a positioning mechanism 4, and the mold core 3 is connected to the lower mold cavity 21 through the positioning mechanism 4.

[0028] In this embodiment, the positioning mechanism 4 includes a bolt 41 and a spring 42. The lower template cavity 21 has a countersunk hole 22. The bolt 41 passes through the countersunk hole 22, and a nut is connected to one end of the bolt 41 passing through the lower template 2. The nut is slidably connected within the countersunk hole of the lower template 2. The spring 42 is sleeved on the outside of the bolt 41. The upper end of the spring 42 abuts against the head of the bolt 41, and the lower end of the spring 42 abuts against the countersunk head of the countersunk hole 22. The lower side of the mold core 3 has a positioning hole 31 (see...). Figure 4 The positioning hole 31 and the countersunk through hole 22 are set accordingly, and the inner diameter of the positioning hole 31 and the outer diameter of the head of the bolt 41 are set accordingly.

[0029] In this embodiment, an upper limit plate 12 is connected to the side of the upper template 1, and the upper limit plate 12 is located at the end of the upper template cavity 11 away from the upper positioning groove 111. A lower limit plate 23 is connected to the side of the lower template 2, and the lower limit plate 23 is located at the end of the lower template cavity 21 away from the lower positioning groove 211. When the mold is closed, the upper limit plate 12 and the lower limit plate 23 respectively abut against the end of the mold core 3 away from the positioning ring 32.

[0030] In this embodiment, the upper template 1 is connected to a top plate 5 at the end away from the lower template 2, and the lower template 2 is connected to a bottom plate 6 at the end away from the upper template 1.

[0031] like Figure 5 The molding die for the hose shown has a bolt 41 with a pin 411 and a threaded part 412. The pin 411 and the threaded part 412 are integrally formed. The outer diameter of the pin 411 corresponds to the inner diameter of the bottom hole of the countersunk through hole 22. The pin 411 is slidably connected to the bottom hole of the countersunk through hole 22.

[0032] like Figure 6-8 The molding die for hoses shown has a positioning ring 32 at one end of the mold core 3, which is arranged around the side wall of the mold core 3. The upper mold cavity 11 has an upper positioning groove 111, and the lower mold cavity 21 has a lower positioning groove 211, which are positioned corresponding to the positioning ring 32. When the mold is closed, the upper and lower sides of the positioning ring 32 are connected to the upper positioning groove 111 and the lower positioning groove 211, respectively.

[0033] In this embodiment, the positioning ring 32 has an upper positioning platform 321 at its top and a lower positioning platform 322 at its bottom, with the upper and lower positioning platforms 321 and 322 arranged horizontally and parallel to each other. The upper positioning groove 111 corresponds to the upper positioning platform 321, and the lower positioning groove 211 corresponds to the lower positioning platform 322. During mold closing, the bottom surfaces of the lower positioning platform 322 and the lower positioning groove 211 abut against each other, as does the bottom surface of the upper positioning platform 321 and the upper positioning groove 111.

[0034] In this embodiment, the upper mold cavity 11 includes an upper support cavity 112 and an upper forming cavity 113, with the upper support cavity 112 integrally connected to both ends of the upper forming cavity 113; the lower mold cavity 21 includes a lower support cavity 212 and a lower forming cavity 213, with the lower support cavity 212 integrally connected to both ends of the lower forming cavity 213. During mold closing, the upper support cavity 112 and the lower support cavity 212 abut against both ends of the mold core 3, while the upper forming cavity 113 and the lower forming cavity 213 maintain a gap with the mold core 3. An upper positioning groove 111 is provided in the upper support cavity 112, and a lower positioning groove 211 is provided in the lower support cavity 212.

[0035] like Figure 9-10 The molding die for the hose shown has an upper groove 1131 along the outer periphery of the upper molding cavity 113 and a lower groove 2131 along the lower molding cavity 213. The upper groove 1131 and the lower groove 2131 are respectively provided. When the mold is closed, the upper groove 1131 and the lower groove 2131 abut against each other.

[0036] This utility model is used for the compression molding of silicone rubber tubes. The compression mold is connected to the molding machine via a top plate 5 and a bottom plate 6. The molding machine drives the upper mold plate 1 and the lower mold plate 2 to separate the molds. The pre-formed silicone rubber sheet is placed in the lower mold cavity 21 of the lower mold plate 2. The mold core 3 is connected to the lower mold cavity 21. The head of the bolt 41 extends into the positioning hole 31, and the positioning ring 32 extends into the lower positioning groove 211. The lower positioning platform 322 and the bottom surface of the lower positioning groove 211 abut against each other, positioning the mold core 3. The end of the mold core 3 away from the positioning ring 32 abuts against the lower limiting plate 23. The positioning ring 32 extends into the upper positioning groove 111 and the lower positioning groove 211. The upper positioning platform 321 and the bottom surface of the upper positioning groove 111 abut against each other, positioning the mold core 3.

[0037] Another silicone rubber sheet is then placed over the mold core 3 and the lower mold plate 2. The molding machine drives the upper mold plate 1 to move along the guide post towards the lower mold plate 2. The upper mold plate 1 and the lower mold plate 2 close, and the positioning ring 32 extends into the upper positioning groove 111. The upper positioning platform 321 and the bottom surface of the upper positioning groove 111 abut against each other, completely positioning the mold core 3. The silicone rubber sheet is molded in the molding cavity formed by the upper mold plate cavity 11 and the lower mold plate cavity 21. At the same time, the upper cutting groove 1131 and the lower cutting groove 2131 abut against each other, and the upper cutting groove 1131 and the lower cutting groove 2131 respectively form cutting edges along the upper molding cavity 113 and the lower molding cavity 213 to cut off the remaining silicone rubber tube material.

[0038] The upper mold 1 and lower mold 2 are separated, and the molded silicone rubber tube and mold core 3 are removed together and placed into the vulcanization equipment for vulcanization. Remove any remaining material. Repeat the above steps.

[0039] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A molding die for rubber hoses, characterized in that: The mold includes an upper template (1) and a lower template (2), which are connected by guide pillars. A mold core (3) is connected between the upper template (1) and the lower template (2). The upper template (1) has an upper template cavity (11) on the side near the lower template (2), and the lower template (2) has a lower template cavity (21) on the side near the upper template (1). The upper template cavity (11) and the lower template cavity (21) abut against each other to form a molding cavity. The mold core (3) is connected between the upper template cavity (11) and the lower template cavity (21). The lower template cavity (21) is connected to a positioning mechanism (4), and the mold core (3) is connected to the lower template cavity (21) through the positioning mechanism (4).

2. The molding die for hoses according to claim 1, characterized in that: The positioning mechanism (4) includes a bolt (41) and a spring (42); the lower template cavity (21) is provided with a countersunk hole (22), the bolt (41) passes through the countersunk hole (22), and a nut is connected to one end of the bolt (41) passing through the lower template (2), and the nut is slidably connected in the countersunk hole provided in the lower template (2); the spring (42) is sleeved on the outside of the bolt (41), the upper end of the spring (42) abuts against the head of the bolt (41), and the lower end of the spring (42) abuts against the countersunk head provided in the countersunk hole (22); the mold core (3) is provided with a positioning hole (31) on the lower side, the positioning hole (31) and the countersunk hole (22) are correspondingly set, and the inner diameter of the positioning hole (31) and the outer diameter of the head of the bolt (41) are correspondingly set; during molding, the head of the bolt (41) extends into the positioning hole (31).

3. The molding die for hoses according to claim 2, characterized in that: The bolt (41) has a shank portion including a pin portion (411) and a threaded portion (412). The pin portion (411) and the threaded portion (412) are integrally formed. The outer diameter of the pin portion (411) corresponds to the inner diameter of the bottom hole of the countersunk through hole (22). The pin portion (411) is slidably connected to the bottom hole of the countersunk through hole (22).

4. The molding die for hoses according to claim 1, characterized in that: The mold core (3) is provided with a positioning ring (32) at one end, and the positioning ring (32) is arranged around the side wall of the mold core (3); the upper mold cavity (11) is provided with an upper positioning groove (111), and the lower mold cavity (21) is provided with a lower positioning groove (211). The upper positioning groove (111) and the lower positioning groove (211) are arranged corresponding to the positioning ring (32); when the mold is closed, the upper and lower sides of the positioning ring (32) are respectively connected to the upper positioning groove (111) and the lower positioning groove (211).

5. The molding die for hoses according to claim 4, characterized in that: The positioning ring (32) has an upper positioning platform (321) at the top and a lower positioning platform (322) at the bottom. The upper positioning platform (321) and the lower positioning platform (322) are arranged horizontally and parallelly. The upper positioning groove (111) is set corresponding to the upper positioning platform (321), and the lower positioning groove (211) is set corresponding to the lower positioning platform (322). When the mold is closed, the bottom surfaces of the lower positioning platform (322) and the lower positioning groove (211) abut together, and the bottom surfaces of the upper positioning platform (321) and the upper positioning groove (111) abut together.

6. The molding die for hoses according to claim 5, characterized in that: The upper mold cavity (11) includes an upper support cavity (112) and an upper forming cavity (113), the upper support cavity (112) being integrally connected to both ends of the upper forming cavity (113); the lower mold cavity (21) includes a lower support cavity (212) and a lower forming cavity (213), the lower support cavity (212) being integrally connected to both ends of the lower forming cavity (213); when the mold is closed, the upper support cavity (112) and the lower support cavity (212) abut against both ends of the mold core (3), the upper forming cavity (113) and the lower forming cavity (213) maintaining a gap with the mold core (3); the upper positioning groove (111) is provided in the upper support cavity (112), and the lower positioning groove (211) is provided in the lower support cavity (212).

7. The molding die for hoses according to claim 6, characterized in that: An upper cutting groove (1131) is provided along the outer periphery of the upper molding cavity (113), and a lower cutting groove (2131) is provided along the lower molding cavity (213). The upper cutting groove (1131) and the lower cutting groove (2131) are respectively provided; when the mold is closed, the upper cutting groove (1131) and the lower cutting groove (2131) abut against each other.

8. The molding die for hoses according to claim 4, characterized in that: The upper template (1) is connected to an upper limit plate (12) on its side. The upper limit plate (12) is located at the end of the upper template cavity (11) away from the upper positioning groove (111). The lower template (2) is connected to a lower limit plate (23) on its side. The lower limit plate (23) is located at the end of the lower template cavity (21) away from the lower positioning groove (211). When the mold is closed, the upper limit plate (12) and the lower limit plate (23) respectively abut against the end of the mold core (3) away from the positioning ring (32).

9. The molding die for hoses according to claim 1, characterized in that: The upper template (1) is connected to a top plate (5) at the end away from the lower template (2), and the lower template (2) is connected to a bottom plate (6) at the end away from the upper template (1).

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