Bent pipe cloth clamping rubber mold and demolding method thereof

Abstract

The invention relates to a bent pipe cloth clamping rubber mold and a demolding method thereof, and belongs to the technical field of mold processing. An upper mold plate and a lower mold plate are connected through a positioning mechanism, the two ends of a middle mold core are detachably connected with a left mold core and a right mold core through anti-rotation mechanisms, the middle mold core is made of a smashing material, a groove is formed in the lower surface of the upper mold plate, and a containing groove is formed in the upper surface of the lower mold plate. And during mold closing, the groove and the accommodating groove jointly define a cavity space for accommodating the left mold core, the middle mold core and the right mold core. An inherent thinking mode is broken through, the left mold core and the right mold core of the high-precision part are separated from the middle mold core of the consumable part through material differentiation design, the demolding difficulty is reduced, and product damage is avoided; the middle mold core is made of gypsum which is low in cost and easy and convenient to manufacture and is suitable for a complex bent pipe structure, and production economy is improved. Overall forming ensures that the cord fabric is continuous and free of faults, and the mechanical property of products is remarkably improved.

Description

Technical Field

[0001] This invention relates to a rubber mold for bending pipes and a demolding method thereof, belonging to the field of mold processing technology. Background Technology

[0002] Rubber molds are used for many bent pipe products (such as rubber bends). Demolding typically utilizes the deformability of rubber by blowing air into the mold core, causing the rubber to expand and thus demold. However, in actual production, some special bent pipe products require an additional layer of reinforcing fabric in the middle to improve their pressure resistance and deformation resistance. However, because the fabric restricts rubber expansion, this demolding method is unsuitable, leading to demolding difficulties. The traditional solution is to process both ends separately and then splice them together with a section of rubber. This demolding method is not only costly but also prone to the fabric breaking in the middle, weakening the middle section of the bent pipe product.

[0003] Therefore, we have made improvements to this by proposing a bent pipe clamping rubber mold and its demolding method. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention designs a bent pipe with fabric-insulated rubber mold and its demolding method. Through a sacrificial mold core design and modular assembly scheme, it solves the demolding problem of fabric-insulated rubber bent pipes, while ensuring the integrity and performance consistency of the product and significantly reducing production costs.

[0005] The technical solution adopted in this invention is a bent pipe clamping rubber mold, which includes an upper template and a lower template connected by a positioning mechanism. The two ends of the middle mold core are detachably connected to the left mold core and the right mold core by an anti-rotation mechanism. The middle mold core is made of a crushable material. The lower surface of the upper template is provided with a groove, and the upper surface of the lower template is provided with a receiving groove. When the mold is closed, the groove and the receiving groove together form a cavity space for accommodating the left mold core, the middle mold core and the right mold core.

[0006] As a further aspect of the present invention, the pulverizable material is gypsum.

[0007] As a further embodiment of the present invention, the positioning mechanism includes a positioning post and a positioning sleeve. The positioning post is disposed on the upper template, and the positioning sleeve is disposed on the lower template. The positioning post and the positioning sleeve are slidably engaged.

[0008] As a further embodiment of the present invention, the anti-rotation mechanism includes anti-rotation posts disposed at both ends of the middle mold core and anti-rotation holes disposed on the left and right mold cores respectively, and the anti-rotation posts are inserted into the anti-rotation holes.

[0009] As a further embodiment of the present invention, the anti-rotation pillar is made of the same material as the middle mold core.

[0010] As a further embodiment of the present invention, the other end of both the left mold core and the right mold core is provided with a cone, and the lower template is provided with a cone hole for restricting the movement of the cone.

[0011] As a further embodiment of the present invention, the upper template is equipped with a plurality of guide pillars, and the lower template is provided with guide holes, the guide pillars and guide holes cooperating for mold closing guidance.

[0012] Based on the design of a bent pipe clamping rubber mold, this invention discloses a demolding method, as follows: Step 1: Assemble the left mold core, middle mold core, and right mold core into a bending mold core using an anti-rotation mechanism; Step 2: The outer surface of the bending die core is sequentially covered with a first layer of rubber, a rubber-impregnated fabric, and a second layer of rubber to form a pre-formed product. Step 3: Install the pre-formed product onto the lower template, close the upper template, and then perform vulcanization treatment; Step four: After vulcanization is complete, open the mold, remove the left and right mold cores, and crush the middle mold core to complete demolding.

[0013] As a further embodiment of the present invention, the first and second rubber layers are made of nitrile rubber; the fabric is made of aramid; and the process of treating the fabric by impregnation is to soak the fabric in an adhesive and then dry it, with a soaking time of not less than 120 seconds and a drying time of not less than 30 minutes at room temperature.

[0014] This invention discloses a rubber mold for bending pipes with fabric clamping and its demolding method. Its advantages are that, compared with existing technologies, this invention breaks with conventional thinking by using differentiated material design to separate the high-precision left and right mold cores from the consumable middle mold core, reducing demolding difficulty and avoiding product damage. The middle mold core uses low-cost, easy-to-manufacture plaster, suitable for complex bending pipe structures, improving production economy. Integral molding ensures continuous fabric layers without breaks, significantly improving the product's mechanical properties. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the template and core structure of the present invention; Figure 2 for Figure 1 Enlarged view of a portion of point E in the middle; Figure 3 for Figure 2 Enlarged view of a portion of point F in the middle; Figure 4 for Figure 1 A top-down view; Figure 5 for Figure 4 Enlarged view of parts B and C in the middle; Figure 6 for Figure 4 Schematic diagram of section AA and a partial view at point D; Figure 7 This is a schematic diagram showing the state of the left and right mold cores after they have been removed.

[0017] As shown in the figure: 1. Upper template; 2. Lower template; 3. Left mold core; 4. Middle mold core; 5. Right mold core; 6. Positioning post; 7. Positioning sleeve; 8. Anti-rotation post; 9. Anti-rotation hole; 10. Cone; 11. Conical hole; 12. Guide post; 13. Guide hole; 14. First layer of rubber; 15. Cord fabric; 16. Second layer of rubber; 17. Receiving groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To further understand the invention, the technical solution will be further described below in conjunction with specific embodiments.

[0020] Example 1: As Figures 1-7 As shown, this embodiment provides a bent pipe clamping rubber mold, including an upper template 1 and a lower template 2 connected by a positioning mechanism. The two ends of the middle mold core 4 are detachably connected to the left mold core 3 and the right mold core 5 through an anti-rotation mechanism. The middle mold core 4 is made of a crushable material. The lower surface of the upper template 1 is provided with a groove, and the upper surface of the lower template 2 is provided with a receiving groove 17. When the upper template 1 and the lower template 2 are closed, the groove and the receiving groove 17 together form a cavity space for accommodating the left mold core 3, the middle mold core 4 and the right mold core 5.

[0021] In one specific implementation of this embodiment, the positioning mechanism includes positioning posts 6 located at the four corners of the upper template 1 and positioning sleeves 7 correspondingly located on the lower template 2. The positioning posts 6 and positioning sleeves 7 are slidably engaged to achieve quick, accurate alignment and reliable connection between the upper template 1 and the lower template 2. The anti-rotation mechanism includes anti-rotation posts 8 located at both ends of the middle mold core 4. The left mold core 3 and the right mold core 5 have anti-rotation holes 9 at their ends near the middle mold core 4. In this embodiment, the cross-section of the anti-rotation post 8 is rectangular, and the internal shape of the anti-rotation hole 9 is also rectangular. The anti-rotation post 8 and the anti-rotation hole 9 are precisely inserted into each other. The material of the middle mold core 4 and the anti-rotation post 8 is plaster. The left mold core 3 and the right mold core 5 are both provided with a cone 10 at the end away from the middle mold core 4. The lower template 2 is provided with a conical hole 11 for restricting the movement of the cone 10. The conical hole 11 is connected to the receiving groove 17. The mold core is installed on the lower template 2 by the cooperation of the cone 10 and the conical hole 11. The circumferential and axial positioning is achieved by the cooperation of the cone 10 and the conical surface of the conical hole 11 to prevent the mold core from moving and deviating.

[0022] To prevent misalignment during installation, the upper template 1 is equipped with three extended guide pillars 12, and the lower template 2 is provided with guide holes 13. The guide pillars 12 and guide holes 13 cooperate to guide the mold closing.

[0023] As mentioned above, the upper mold plate 1, lower mold plate 2, left mold core 3, and right mold core 5 are all made of special mold steel and are manufactured by CNC machining center with an accuracy of no more than 0.02mm; the positioning column 6 and positioning sleeve 7 are made of GCr15 steel with an accuracy of no more than 0.005mm; the middle mold core 4 is made of high-strength gypsum material (α-type hemihydrate calcium sulfate powder mixed with water at a ratio of 1:0.6, thoroughly stirred and then cast in a mold with a tolerance of no more than 0.1mm, a room temperature drying time of no less than 8 hours, and a strength of 15-40MPa after drying).

[0024] Example 2: As Figures 1-7 As shown, the present invention provides a demolding method for a bent pipe fabric-clamped rubber mold, the specific operation of which is as follows: First, the left mold core 3, the middle mold core 4, and the right mold core 5 are assembled together using anti-rotation pillars 8 and anti-rotation holes 9 to obtain a bent tube mold core. Then, a first layer of rubber 14 is evenly wrapped around the bent tube mold core, and then it is wrapped with rubber-impregnated fabric 15. Finally, a second layer of rubber 16 is evenly wrapped around the outside to complete the pre-formed product. The first layer of rubber 14 and the second layer of rubber 16 mentioned above are made of NBR 70 degree raw rubber, pressed into a 1mm thin sheet. The fabric is made of aramid with a thickness of 0.2mm. It is impregnated with Chemlock 205 adhesive and dried. The impregnation time is not less than 120 seconds, and the drying time at room temperature is not less than 30 minutes.

[0025] Next, the entire assembly is installed on the lower template 2 by fitting the cone 10 at the front end of the left mold core 3 and the right mold core 5 with the cone hole 11 on the lower template 2, and then the upper template 1 is closed to complete the entire mold installation. Finally, the vulcanizing machine performs low-pressure vulcanization at a temperature of 165-175 degrees Celsius, a pressure of 5-7 MPa, and a time of 320 seconds. Because the vulcanization pressure is much lower than the rated pressure of the plaster (15-40 MPa), it ensures that the plaster will not crack during vulcanization. After vulcanization is complete, the mold is opened, and the left mold core 3 and right mold core 5 are manually removed. The plaster-made middle mold core 4 and anti-rotation pillar 8 are crushed, breaking the entire structure into parts, thus successfully demolding. After demolding, the rubber product is cleaned and wiped dry with an air gun.

[0026] The process involves replacing the mold core 4 with a new one for each subsequent run, and this cycle is repeated. The mold core 4 is crushed mechanically or removed manually, and a new mold core 4 must be replaced after demolding for subsequent production.

[0027] This invention overcomes the technical bottleneck by transforming the overall demolding problem into a partial sacrificial demolding through a crushable mold core design; only the middle mold core 4 is a consumable part, while the left and right mold cores can be reused, significantly reducing production costs.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rubber mold for bending pipes and clamping fabric, characterized in that, The upper template (1) and the lower template (2) are connected by a positioning mechanism. The two ends of the middle mold core (4) are detachably connected to the left mold core (3) and the right mold core (5) through an anti-rotation mechanism. The middle mold core (4) is made of crushable material. The lower surface of the upper template (1) is provided with a groove, and the upper surface of the lower template (2) is provided with a receiving groove (17). When the mold is closed, the groove and the receiving groove (17) together form a cavity space for accommodating the left mold core (3), the middle mold core (4) and the right mold core (5).

2. The rubber mold for bending pipes and clamping fabric according to claim 1, characterized in that, The material that can be crushed is gypsum.

3. The rubber mold for bending pipes and clamping fabric according to claim 2, characterized in that, The anti-rotation mechanism includes anti-rotation posts (8) at both ends of the middle mold core (4) and anti-rotation holes (9) corresponding to the left mold core (3) and right mold core (5), with the anti-rotation posts (8) and anti-rotation holes (9) being inserted into each other.

4. The rubber mold for bending pipes and clamping fabric according to claim 3, characterized in that, The anti-rotation column (8) is made of the same material as the middle mold core (4).

5. The rubber mold for bending pipes and clamping fabric according to claim 4, characterized in that, The other end of the left mold core (3) and the right mold core (5) are both provided with a cone (10), and the lower template (2) is provided with a cone hole (11) for restricting the movement of the cone (10).

6. The rubber mold for bending pipes and clamping fabric according to any one of claims 1 to 5, characterized in that, The positioning mechanism includes a positioning column (6) and a positioning sleeve (7). The positioning column (6) is set on the upper template (1), and the positioning sleeve (7) is set on the lower template (2). The positioning column (6) and the positioning sleeve (7) slide together.

7. The rubber mold for bending pipes and clamping fabric according to any one of claims 1 to 6, characterized in that, The upper template (1) is equipped with several guide pillars (12), and the lower template (2) is provided with guide holes (13). The guide pillars (12) and guide holes (13) are used to guide the mold closing.

8. A demolding method for a bent pipe clamping rubber mold, characterized in that, Specifically as follows: Step 1: Assemble the left mold core (3), middle mold core (4) and right mold core (5) into a bending mold core using an anti-rotation mechanism; Step 2: The outer surface of the bending core is sequentially covered with a first layer of rubber (14), an impregnated fabric (15), and a second layer of rubber (16) to form a preformed product; Step 3: Install the preformed product on the lower template (2), close the upper template (1), and then perform vulcanization treatment; Step 4: After vulcanization is completed, open the mold, remove the left mold core (3) and the right mold core (5), and crush the middle mold core (4) to complete the demolding.

9. The demolding method for a bent pipe clamping rubber mold, characterized in that, The first layer of rubber (14) and the second layer of rubber (16) are made of nitrile rubber; the fabric (15) is made of aramid.

10. The demolding method for a bent pipe clamping rubber mold, characterized in that, The processing steps for the glue-impregnated curtain fabric (15) are as follows: the curtain fabric (15) is soaked in adhesive and dried, the soaking time is not less than 120 seconds, and the drying time at room temperature is not less than 30 minutes.

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