Multi-petal back-off type rubber metal joint mold and product forming method

Abstract

A multi-petal back-off type rubber metal joint mold comprises an upper mold, a middle mold and a lower mold, the middle mold is arranged between the upper mold and the lower mold, a rubber injection barrel is arranged between the upper mold and the middle mold, a groove is formed in the bottom of the rubber injection barrel, an upper insert is arranged in the groove, a through mounting hole is formed in the middle mold, and the upper insert is arranged in the mounting hole. A split type split die and a partition plate are arranged in the mounting hole of the middle die, a circular groove is formed in the lower die, and a lower insert is arranged in the circular groove. The split type outer sleeve, the split mold and the partition plate are accurately positioned through the inner positioning protruding block and the outer positioning ring. And the middle mold is used for limiting in the circumferential direction, and the upper mold, the lower mold, the glue injection plug and the glue injection barrel are used for limiting in the vertical direction, so that the shape of a product is prevented from being deformed on the whole, and the qualification rate of the product is improved. And the split mold, the partition plate, the upper insert and the lower insert in the mold are arranged to be of a split structure, so that the mold can be assembled and demolded very conveniently and efficiently.

Description

Technical Field

[0001] The invention relates to a mould and a product forming method, and in particular to a multi-petal undercut rubber metal joint mould and a product forming method. Background Art

[0002] At present, the rubber metal joint mold design of "Big Neck" mostly adopts the vulcanization method of transfer mold injection and pressure, and the product itself is a multi-petal structure with undercuts, so in the molding process, there are problems such as easy scratching of the overall mold core, difficulty in overall demoulding, and high production and manufacturing costs. After vulcanization, the product size shrinkage deviation is large and the eccentricity value difference is large.

[0003] Through domestic search, it was found that the following patents have similarities with the present invention: The invention with application number CN201410141583.X and name “Fully automatic demoulding injection molding mold” relates to the field of plastic molding technology, and specifically relates to a fully automatic demoulding injection molding mold, which is provided with a movable mold base plate, a push rod push plate, a push rod fixed plate, a movable mold plate, a fixed mold plate combined with the movable mold plate, and a fixed mold base plate in sequence from bottom to top, a core is provided in the movable mold plate, a cavity combined with the core is provided in the fixed mold plate, and after the cavity and the core are combined, a one-mold two-cavity structure is formed inside thereof, which can simultaneously inject two inclined plate multi-rib plastic parts, the two cavities have the same structure and are arranged in reverse symmetry, and a transverse flow channel leading to the two cavities is arranged between the two cavities. The beneficial effect of the present invention is that the fully automatic demoulding injection molding mold of the present invention reliably realizes fully automatic demoulding, improves the production efficiency of plastic parts, and has stable quality. At the same time, due to the simplified structure, the manufacturing difficulty and cost of the mold are reduced, and the service life and precision of the mold are improved.

[0004] The invention with application number CN201711104487.8 and titled “A method for manufacturing a rail vibration damper and an automatic demoulding mold of a sub-mother-mold structure” discloses a method for manufacturing a rail vibration damper and an automatic demoulding mold of a sub-mother-mold structure. The automatic demoulding mold of the sub-mother-mold structure of the rail vibration damper includes a mother mold and a sub-mold installed on the mother mold, and the mother mold includes a glue plug mounting plate, a glue plug, a glue injection cylinder, a lower mold frame, a lower mold plate, a push-pull plate, a push rod, and an upper mold frame located above the lower mold frame. The sub-mold includes a sub-mold upper mold core and a sub-mold lower mold core; the sub-mold upper mold core is installed on the upper mold frame, and the sub-mold lower mold core is installed on the lower mold frame. The mother mold is universal and the sub-mold can be replaced, so that when making different series of rail vibration dampers, only the sub-mold needs to be replaced. The ejector-type demoulding mechanism is adopted to realize the automatic separation of the product and the mold. The present invention reduces the mold development cost from the design source, shortens the mold development cycle, and adopts a push rod type demoulding mechanism to realize automatic separation of the product and the mold, thereby reducing the production cost of the track vibration damper and improving the production efficiency of the track vibration damper.

[0005] The structures in the above patents are very different from the present application, and none of the above patents have a mold structure in which the upper and lower inserts, petal molds and partitions all adopt a petal-type parting structure, nor do they have the beneficial technical effects of sequential demolding after vulcanization molding, which is efficient and orderly without scratching the core shaft. Summary of the invention

[0006] The technical problem to be solved by the present invention is: how to make the mold of the split-flap rubber metal joint quickly and effectively close the mold and inject glue, and quickly and effectively demould the molten rubber after cooling, so as to complete the product manufacturing with high efficiency and high quality.

[0007] In view of the above problems, the technical solution proposed in the present invention is: a multi-petal inverted rubber metal joint mold, including an upper mold, a middle mold and a lower mold, the middle mold is arranged between the upper mold and the lower mold, a glue injection cylinder is arranged between the upper mold and the middle mold, a groove is opened at the bottom of the glue injection cylinder, an upper insert is arranged in the groove, a through mounting hole is opened in the middle mold, a petal mold and a partition are arranged in the mounting hole of the middle mold, a circular groove is opened in the lower mold, and a lower insert is arranged in the circular groove.

[0008] An annular groove is opened on the upper surface of the glue injection cylinder, so that a columnar central column is formed on the inner side of the annular groove, and an external glue injection hole penetrating the glue injection cylinder is opened at the bottom of the annular groove, and the external glue injection holes are evenly distributed in the circumferential direction of the annular groove.

[0009] It also includes a glue injection plug, which is in the shape of a round tube and is placed in the annular groove. The upper mold presses the glue injection plug tightly in the annular groove so that the glue injection plug blocks all external glue injection holes.

[0010] The upper insert is a petal-type insert with a through upper positioning hole in the middle and a waist-shaped groove in the circumferential direction outside the upper positioning hole. Each waist-shaped groove has an inner glue injection hole that passes through the upper insert on the side close to the upper positioning hole, and the diameter of the inner glue injection hole gradually decreases from top to bottom.

[0011] The lower insert is a petal insert, and an upwardly protruding annular inner positioning convex block is arranged in the middle of the upper surface of the lower insert. The inner positioning convex block is provided with a mounting hole which passes through the inner positioning convex block and the upper insert.

[0012] The upper surface of the lower insert is also provided with an annular outer positioning ring and a strip-shaped expansion groove. The outer positioning ring is arranged on the outside of the inner positioning protrusion, and the height of the outer positioning ring is less than the height of the inner positioning protrusion; the expansion groove is arranged on the outside of the outer positioning ring, and the length direction of the expansion groove is the radial direction of the outer positioning ring.

[0013] Preferably, the thickness of the inner side of the partition is smaller than the thickness of the outer side of the partition, and a step surface is formed at the boundary between the inner and outer sides of the partition; the inner side of the bottom of the partition is provided with a groove corresponding to the inner positioning protrusion and outer positioning ring of the lower insert, and the outer sides of the inner positioning protrusion and outer positioning ring of the lower insert are both engaged in the groove of the partition.

[0014] A product molding method using a multi-petal undercut rubber metal joint mold is provided. The mold is first assembled, and then molten rubber is injected into the mold. After the rubber is cooled, the product is demoulded and taken out. The assembly steps of the mold include: S1. First install the split lower insert into the lower mold, and then install the mandrel onto the lower insert; S2. Sequentially place the petal-type jacket and partition on the upper surface of the lower panel; S3. Close the petal mold; S4. Assemble the split upper insert and the mandrel; S5. Assemble the middle mold and inject the rubber cylinder; S6. Place the rubber plug and the upper mold in sequence to complete the mold installation.

[0015] Preferably, the injection of molten rubber into the mold is performed by opening a through injection hole on the injection cylinder and the upper insert, injecting the molten rubber into the mold through the injection hole of the injection cylinder and the upper insert, so that the molten rubber is injected into the gap between the core shaft and the outer sleeve, thereby vulcanizing the core shaft and the outer sleeve into a whole with the rubber, and forming a product after cooling.

[0016] Preferably, after the product is cooled and formed, the demoulding step includes: S1. Take out the upper mold, the injection plug and the injection cylinder respectively; S2. Pry and remove the middle mold; S3. Remove the petal mold; S4. Remove the split-petal upper insert; S5. Take out the product and the lower insert in turn, obtain the product, and complete demoulding.

[0017] The beneficial technical effect of the present invention is that an inner positioning protrusion and an outer positioning ring are provided on the lower surface of the upper insert and the upper surface of the lower insert, and the petal-type outer cover, petal mold and partition are accurately positioned by the inner positioning protrusion and the outer positioning ring. The middle mold is used for circumferential positioning, and the upper mold, the lower mold, the injection plug and the injection cylinder are used for vertical positioning, thereby ensuring that the shape of the product will not be deformed as a whole and improving the qualified rate of the product. The petal mold, the partition, the upper insert and the lower insert in the mold are set as a petal-type structure, which makes the assembly and demoulding of the mold very convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the overall structure of the first embodiment; Figure 2 It is a schematic diagram of the overall structure decomposition of the first embodiment; Figure 3 It is a vertical cross-sectional schematic diagram of the first embodiment; Figure 4 for Figure 1 The structural diagram of the hidden upper die; Figure 5 for Figure 4 A schematic diagram of the structure of the glue injection cylinder and the glue injection plug is hidden in the figure; Figure 6 for Figure 5 The structural diagram of the middle mold and the lower mold is hidden in the middle; Figure 7 for Figure 6 Schematic diagram of structural decomposition; Figure 8 The structure of the glue injection cylinder of the first embodiment is shown in FIG. Figure 1 ; Fig. 9 The structure of the glue injection cylinder of the first embodiment is shown in FIG. Figure 2 ; Fig.10 It is a structural schematic diagram of the upper insert of the first embodiment; Fig.11 It is a structural schematic diagram of the lower insert of the first embodiment; Fig.12 It is a structural schematic diagram of the lower mold of the first embodiment; Fig.13 It is a structural schematic diagram of the partition of Example 1; In the figure: upper mold 1, glue injection plug 2, glue injection cylinder 3, annular groove 31, center column 32, external glue injection hole 33, first layer groove 34, second layer groove 35, third layer groove 36, flap mold 4, outer sleeve 5, rubber 6, partition 7, upper insert 8, upper positioning hole 81, waist-shaped groove 82, inner glue injection hole 83, lower insert 9, outer positioning ring 91, inner positioning protrusion 92, telescopic groove 93, core shaft 10, middle mold 11, lower mold 12, circular groove 121, lower positioning hole 122. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1

[0020] like Figures 1 to 3 as well as Figures 5 to 7As shown, the mold of the multi-petal undercut rubber 6 metal joint includes an upper mold 1, a glue injection plug 2, a glue injection cylinder 3, a petal mold 4, a partition 7, an upper insert 8, a lower insert 9, a middle mold 11 and a lower mold 12. The outer sleeve 5, the rubber 6 and the mandrel 10 are components of the metal joint, and are also the products made after demolding in this embodiment. The middle mold 11 is arranged between the upper mold 1 and the lower mold 12, the glue injection cylinder 3 is arranged between the upper mold 1 and the middle mold 11, and the glue injection plug 2 is placed in the glue injection cylinder 3. A groove is opened at the bottom of the glue injection cylinder 3, and an upper insert 8 is arranged in the groove. A petal mold 4 and a partition 7 are arranged in the mounting hole of the middle mold 11, and a circular groove 121 is opened in the lower mold 12, and a lower insert 9 is arranged in the circular groove 121. The mandrel 10 passes through the mounting hole of the middle mold 11, and the petal outer sleeve 5 is also arranged in the mounting hole of the middle mold 11, and the outer side of the outer sleeve 5 is tightly attached to the inner side of the petal mold 4.

[0021] like Figure 4 , Figure 5 , Figure 8 and Fig. 9 As shown, an annular groove 31 is formed on the upper surface of the glue injection cylinder 3, so that a columnar center column 32 is formed inside the annular groove 31. The glue injection plug 2 is in the shape of a circular tube, and the glue injection plug 2 is placed in the annular groove 31, and the glue injection plug 2 is sleeved on the center column 32. An external glue injection hole 33 is formed at the bottom of the annular groove 31 and passes through the glue injection cylinder 3, and the external glue injection holes 33 are evenly distributed in the circumferential direction of the annular groove 31. The upper mold 1 presses the glue injection plug 2 in the annular groove 31, so that the glue injection plug 2 blocks all the external glue injection holes 33.

[0022] The lower surface of the injection cylinder 3 is provided with three layers of grooves, namely, the first layer of grooves 34, the second layer of grooves 35 and the third layer of grooves 36, and the third layer of grooves 36 is provided in the second layer of grooves 35, and the second layer of grooves 35 is provided in the first layer of grooves 34. Among them, the third layer of grooves 36 is formed by hollowing out the central column 32 of the injection cylinder 3. The first layer of grooves 34 covers the middle mold 11, and the first layer of grooves 34 and the upper end of the middle mold 11 are gap-matched. The second layer of grooves 35 covers the upper insert 8, and the second layer of grooves 35 and the insert are gap-matched. The third layer of grooves 36 covers the core shaft 10, and the third layer of grooves 36 and the upper end of the core shaft 10 are gap-matched.

[0023] like Figure 2 , Figure 8 and Fig.10As shown, the upper insert 8 is a split-petal insert. In this embodiment, the upper insert 8 is divided into four independent petals. A through upper positioning hole 81 is provided in the middle of the upper insert 8. A waist-shaped groove 82 is provided in the circumferential direction of the outer side of the upper positioning hole 81. Each waist-shaped groove 82 is provided with an inner injection hole 83 that penetrates the upper insert 8 on the side close to the upper positioning hole 81. The inner injection hole 83 gradually decreases in diameter from top to bottom. In this embodiment, there are six inner injection holes 83 on the upper insert 8, and the outer sleeve 5, the petal mold 4 and the partition 7 are all three-petal. Each outer sleeve 5, the partition 7, the mandrel 10, the upper insert 8 and the lower insert 9 respectively form a small closed space, and each small closed space is connected to two inner injection holes 83.

[0024] like Figures 11 to 13 As shown, the lower insert 9 is a split-petal insert. In this embodiment, the lower insert 9 and the upper insert 8 are symmetrical structures, and the lower insert 9 is also divided into four independent petals. An upwardly protruding, annular inner positioning protrusion 92 is provided in the middle of the upper surface of the lower insert 9, and a mounting hole that penetrates the inner positioning protrusion 92 and the upper insert 8 is opened on the inner positioning protrusion 92. An annular outer positioning ring 91 and a strip-shaped telescopic groove 93 are also provided on the upper surface of the lower insert 9. The outer positioning ring 91 is arranged on the outer side of the inner positioning protrusion 92, and the height of the outer positioning ring 91 is less than the height of the inner positioning protrusion 92. The telescopic grooves 93 of the upper insert 8 and the lower insert 9 are both arranged on the outer side of the outer positioning ring 91, and the length direction of the telescopic groove 93 is the radial direction of the outer positioning ring 91. If there is no telescopic groove 93, the molten rubber 6 is easy to form a depression after cooling and shrinking. With the telescopic groove 93, the molten rubber 6 flows into the telescopic groove 93, and the product shape can be normal after the rubber 6 cools and shrinks.

[0025] The upper insert 8 and the lower insert 9 are symmetrical structures, and the lower surface of the upper insert 8 is also provided with an inner positioning protrusion 92 and an outer positioning ring 91. The thickness of the inner side of the partition 7 is less than the thickness of the outer side of the partition 7, and an L-shaped step surface is formed at the boundary between the inner side and the outer side of the partition 7. The inner side of the top and bottom of the partition 7 is provided with notches corresponding to the inner positioning protrusion 92 and the outer positioning ring 91 of the lower insert 9, and the outer sides of the inner positioning protrusion 92 and the outer positioning ring 91 of the upper insert 8 and the lower insert 9 are both engaged in the notches of the partition 7. The inner positioning protrusion 92 and the outer positioning ring 91 are supported against the notches on the inner side of the partition 7, and the partition 7 is limited in the radial direction.

[0026] When a multi-petal undercut rubber 6 metal joint mold is used to form a product, the mold is first assembled, and then the molten rubber 6 is injected into the mold. After the rubber 6 is cooled, the product is demoulded and taken out. The assembly steps of the mold 11 include: S1. First install the split lower insert 9 into the lower mold 12, and then install the mandrel 10 onto the lower insert 9; S2. Sequentially place the petal-type jacket 5 and the partition 7 on the upper surface of the lower insert 9; S3. The petal-type petal mold 4 is closed; S4. Assemble the split-flap upper insert 8 and the mandrel 10; S5. Assemble the mold 11 and inject the rubber cartridge 3; S6. The rubber plug 2 and the upper mold 1 are sequentially injected to complete the mold installation.

[0027] The molten rubber 6 is injected into the mold by opening a through injection hole on the injection cylinder 3 and the upper insert 8, and injecting the molten rubber 6 into the mold through the injection holes of the injection cylinder 3 and the upper insert 8, so that the molten rubber 6 is injected into the gap between the core shaft 10 and the outer sleeve 5, so that the core shaft 10 and the outer sleeve 5 are vulcanized into a whole with the rubber 6, and a product is formed after cooling.

[0028] After the product is cooled and formed, the demoulding steps include: S1. Take out the upper mold 1, the injection plug 2 and the injection cylinder 3 respectively; S2. Pry and remove the middle mold 11; S3. Remove the petal-type petal mold 4; S4. Remove the petal-type upper insert 8; S5. Take out the product and the lower insert 9 in turn, obtain the product, and complete demoulding.

[0029] Obviously, without departing from the principles of the present invention, several improvements or modifications made should be considered as within the protection scope of the present invention.

Claims

1. A multi-petal undercut rubber metal joint mold, comprising an upper mold, a middle mold and a lower mold, wherein the middle mold is arranged between the upper mold and the lower mold, and characterized in that: A glue injection cylinder is arranged between the upper mold and the middle mold, a groove is opened at the bottom of the glue injection cylinder, an upper insert is arranged in the groove, a through mounting hole is opened in the middle mold, a petal mold and a partition are arranged in the mounting hole of the middle mold, a circular groove is opened in the lower mold, and a lower insert is arranged in the circular groove.

2. A multi-petal undercut rubber-metal joint mold according to claim 1, characterized in that: An annular groove is opened on the upper surface of the glue injection cylinder, so that a columnar central column is formed on the inner side of the annular groove, and an external glue injection hole penetrating the glue injection cylinder is opened at the bottom of the annular groove, and the external glue injection holes are evenly distributed in the circumferential direction of the annular groove.

3. A multi-petal undercut rubber-metal joint mold according to claim 2, characterized in that: It also includes a glue injection plug, which is in the shape of a round tube and is placed in the annular groove. The upper mold presses the glue injection plug tightly in the annular groove so that the glue injection plug blocks all external glue injection holes.

4. The multi-petal undercut rubber-metal joint mold according to claim 3, characterized in that: The upper insert is a petal-type insert with a through upper positioning hole in the middle and a waist-shaped groove in the circumferential direction outside the upper positioning hole. Each waist-shaped groove has an inner glue injection hole that passes through the upper insert on the side close to the upper positioning hole, and the diameter of the inner glue injection hole gradually decreases from top to bottom.

5. The multi-petal undercut rubber-metal joint mold according to claim 4, characterized in that: The lower insert is a petal insert, and an upwardly protruding annular inner positioning convex block is arranged in the middle of the upper surface of the lower insert. The inner positioning convex block is provided with a mounting hole which passes through the inner positioning convex block and the upper insert.

6. The multi-petal undercut rubber-metal joint mold according to claim 5, characterized in that: The upper surface of the lower insert is also provided with an annular outer positioning ring and a strip-shaped expansion groove. The outer positioning ring is arranged on the outside of the inner positioning protrusion, and the height of the outer positioning ring is less than the height of the inner positioning protrusion; the expansion groove is arranged on the outside of the outer positioning ring, and the length direction of the expansion groove is the radial direction of the outer positioning ring.

7. The multi-petal undercut rubber-metal joint mold according to claim 6, characterized in that: The thickness of the inner side of the partition is smaller than the thickness of the outer side of the partition, and a step surface is formed at the boundary between the inner and outer sides of the partition; the inner side of the bottom of the partition is provided with a groove corresponding to the inner positioning protrusion and outer positioning ring of the lower insert, and the outer sides of the inner positioning protrusion and outer positioning ring of the lower insert are both engaged in the groove of the partition.

8. A product molding method using the multi-petal undercut rubber-metal joint mold according to claim 1, characterized in that: First, assemble the mold, then inject molten rubber into the mold, and then demould the product after the rubber cools down. The mold assembly steps include: S1. First install the split lower insert into the lower mold, and then install the mandrel onto the lower insert; S2. Sequentially place the petal-type jacket and partition on the upper surface of the lower panel; S3. Close the petal mold; S4. Assemble the split upper insert and the mandrel; S5. Assemble the middle mold and inject the rubber cylinder; S6. Place the rubber plug and the upper mold in sequence to complete the mold installation.

9. The product forming method according to claim 8, characterized in that: The method of injecting molten rubber into the mold is as follows: the molten rubber is injected into the mold through the injection holes opened on the injection cylinder and the upper insert, so that the molten rubber is injected into the gap between the core shaft and the outer sleeve, thereby vulcanizing the core shaft and the outer sleeve into a whole with the rubber, and forming a product after cooling.

10. The product forming method according to claim 8 or 9, characterized in that: After the product is cooled and formed, the demoulding steps include: S1. Take out the upper mold, the injection plug and the injection cylinder respectively; S2. Pry and remove the middle mold; S3. Remove the petal mold; S4. Remove the split-petal upper insert; S5. Take out the product and the lower insert in turn, obtain the product, and complete demoulding.

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