CN113799341A - Rubber mold gate design method and mold gate - Google Patents
Rubber mold gate design method and mold gate Download PDFInfo
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- CN113799341A CN113799341A CN202111207860.9A CN202111207860A CN113799341A CN 113799341 A CN113799341 A CN 113799341A CN 202111207860 A CN202111207860 A CN 202111207860A CN 113799341 A CN113799341 A CN 113799341A
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- mold gate
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- rubber mold
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 21
- 238000000465 moulding Methods 0.000 claims abstract description 18
- 238000009966 trimming Methods 0.000 claims abstract description 9
- 239000003292 glue Substances 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000001746 injection moulding Methods 0.000 description 12
- 238000005520 cutting process Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 241000282994 Cervidae Species 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to the field of rubber mold design, in particular to a rubber mold gate design method and a mold gate. The sprue of the rubber mold is designed into the hourglass-shaped necking, so that stress concentration is generated on rubber at the necking in the molding process of a rubber product, and the rubber in the necking is broken by utilizing the shrinkage force generated in the molding process of the rubber product. Thereby simplifying the structure of the rubber mould, simplifying the demoulding process, avoiding the trimming process of the glue injection head, improving the surface quality and the work efficiency of the rubber product and reducing the production cost.
Description
Technical Field
The invention relates to the field of rubber mold design, in particular to a rubber mold gate design method and a mold gate.
Background
In the production of rubber products, after the rubber products adopting the injection process are subjected to demolding, the glue injection head sometimes remains on the surfaces of the products and sometimes remains in the mold. Remain if the injecting glue head and must artifically prune the injecting glue head on the product surface, avoid it to influence product assembly and use, when the injecting glue head remained in the mould, the product surface often accompanied the phenomenon that rubber body damaged and influenced the product and used.
In the process of manually trimming the glue injection head, the glue injection hole on the molded surface of the rubber product can be torn off, or the glue injection head is remained on the rubber product.
In order to avoid the defects of the rubber product and simplify the production process, the technology of automatically trimming the glue injection head is adopted in the production of the rubber product. Through patent retrieval, the following patents mainly exist, which have a certain relationship with the invention:
1. the invention relates to the technical field of injection molds, in particular to a mold side gate automatic casting breaking mechanism, which belongs to Chinese invention patents with the application number of 201711317741.2, the application date of 2017.12.12, the publication number of CN108162333A and the publication date of 2018.06.15, and the name of the mold side gate automatic casting breaking mechanism, and the application number of Suzhou Shuxing precision mold limited company, and the invention patent relates to the technical field of injection molds, in particular to the mold side gate automatic casting breaking mechanism, which comprises the following components: the die comprises a round thimble, a gate insert, a flat thimble and a male die core, wherein the gate insert is arranged on the outer wall of the male die core and is connected with the male die core through a bolt; the inner edge of the core insert is provided with a flat thimble, and the flat thimble is connected with the core insert in a penetrating way; the top side of the male die core is provided with an injection molding piece, and the injection molding piece is connected with the male die core in an injection molding mode; a runner is arranged on the outer side of the gate insert, and one end of the runner is connected with the gate insert in an embedding mode; a round thimble is arranged at the bottom side of the flow passage; a cutting base point is arranged at the connection position of the injection molding piece and the pouring gate of the pouring gate insert; the connection part of the flat thimble and the injection molding piece is set as a stress point, when the connection part of the sprue insert 2 and the injection molding piece 6 passes through the shearing base point 7, the sprue is separated from the injection molding piece 6, and meanwhile, the automatic broken pouring process is completed.
2. The invention discloses a Chinese invention patent with the application number of 201910255455.0, the application date of 2019.04.01, the publication number of CN110394951A and the publication date of 2019.11.01, the name of the Chinese invention patent is 'a die structure with a slide block capable of breaking an automatic broken sprue' and the application name of the Chinese invention patent is 'Shanghai Bao deer car industry Limited company', and the invention patent provides a die structure with a slide block capable of breaking an automatic broken sprue, which comprises a front die, a rear die, a slide block broach component and a material bag which are matched with each other; a runner is formed between the front die and the rear die, and the tail end of each sprue of the runner is connected with an action pipeline; the action pipeline extends into an injection molding cavity; the material bag is fixed on the outer surface of the action pipeline and clamped on the front surface of the sliding block broach assembly; the slide block broach assembly is arranged between the front die and the rear die; the sliding block broach component and the injection molding cavity are respectively positioned at two sides of the flow channel; during injection molding, plastics enter the material bag and the injection molding cavity in sequence from the sprue through the runner. When the injection of the injection molding machine is completed and the mold is opened, the slide block insert arranged on the slide block seat cuts off a flow passage from a product by using a material bag and an action pipeline.
3. The utility model discloses a utility model patent that application number is "201921883794.5", application date is "2019.11.04", the publication number is "CN 210999833U", the publication date is "2020.07.14", the name is "one kind side advances to glue automatic disconnected structure", the applicant is "Kun shan ai than plastic mould limited company", this utility model discloses a side advances to glue automatic disconnected structure, concretely relates to mould design manufacturing technical field, including female template and male template, the below of female template is provided with male template, female template's internally mounted has the product, female template's side surface embedding is provided with runner side runner, one side of male template below is provided with the runner and takes into son earlier. The utility model discloses a through the global design, the material forms the product of solid-state form after solidifying between female template and the public template through flowing through runner side runner inflow, after public template and the board of taking out earlier were opened, runner earlier the suction will be drawing runner side runner downstream together, and mould benevolence is supporting the product simultaneously, and runner side runner and product will produce the shearing force like this, runner side runner and product autosegregation.
4. The utility model discloses a utility model patent that application number is "202022717907.3", application date is "2020.11.23", publication number is "CN 213767006U", publication date is "2021.07.23", the name is "cut off runner structure in the mould", the application person is "wuxihaofen boat science and technology Limited" the utility model discloses a cut off runner structure in mould, including last mould, connecting block, pneumatic cylinder, cutting block and cutter, the connecting block is located go up the mould top, the connecting block bottom with go up mould top rigid coupling, open the mounting chamber to the connecting block side, the mounting chamber inside wall is opened there is the guide way, the inside cutting block that is equipped with of mounting chamber, the equal rigid coupling in both sides of cutting block has the guide block, and the guide block fit in the guide way; the top end of the cutting block is provided with a connecting hole, the cutter is positioned inside the connecting hole, and the outer side surface of the cutter is fixedly connected with the inner wall of the connecting hole. The hydraulic cylinder can drive the cutting block to slide in the mounting cavity along the guide groove, and at the moment, the cutting block can cut off the material in the pouring gate under the action of the cutter.
5. The utility model discloses a utility model patent of application number "202021422692.6", application date "2020.07.17", publication number "CN 212920280U", publication date "2021.04.09", title "plastic mould automatic cutout runner mechanism", applicant for "Zhejiang spring born electronics limited company", this utility model patent discloses a plastic mould automatic cutout runner mechanism, it includes sliding assembly, oblique guide pillar, inlays needle, ejector pin and movable mould mold insert, sliding assembly is equipped with top and moves back hole, runner and with the die cavity of runner intercommunication, top move back the hole with the runner link up from top to bottom, inlay the needle and be located in top moves back the hole, oblique guide pillar with sliding assembly swing joint, the ejector pin is located sliding assembly's below, the movable mould mold insert is located the die cavity below, works as the oblique guide pillar stirs sliding assembly drives the runner is kept away from when the die cavity moves to preset position, the ejector rod pushes the insert pin upwards to eject the runner out of the sliding assembly, and the movable mold insert moves upwards to eject the plastic product out of the cavity, so that the manual sprue removal is avoided, the automatic batch production is favorably realized, and the production efficiency is improved.
Above-mentioned patent all adopts cutting device to cut off the injecting glue head or adopts the mode of runner dislocation shearing to snap the injecting glue head, and above-mentioned patent exists: the rubber mold has the technical problems of complex structure and complex demolding operation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a rubber mold gate design method and a mold gate aiming at the defects in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a design method of a rubber mold pouring gate comprises the following steps: by designing the shape of the gate of the rubber mold, the rubber injection head is contracted and broken by utilizing the stress concentration principle in the molding process of a rubber product, so that the structure of the rubber mold is simplified, the demolding procedure is simplified, the trimming procedure of the rubber injection head is omitted, and the surface quality and the work efficiency of the rubber product are improved.
Further, the rubber mold gate is designed into a shape of a necking, so that stress concentration is generated on rubber at the necking in the molding process of a rubber product, and the rubber in the necking is broken by utilizing the shrinkage force of the rubber product during molding.
Furthermore, the mold gate is two communicated taper holes, and one small-diameter ends of the two taper holes are connected to form an hourglass-shaped necking so as to reduce the friction resistance at the mold gate and facilitate demolding.
A mould sprue adopting the above rubber mould sprue design method comprises; the rubber mold comprises a rubber mold and a mold gate arranged on the rubber mold. The mold gate is composed of a first taper hole and a second taper hole which are coaxially communicated, and the small-diameter end of the first taper hole and the small-diameter end of the second taper hole are connected to form an hourglass-shaped necking. Stress concentration can be formed at the necking part, and the rubber at the necking part can be broken when the rubber is molded and shrunk; and the frictional resistance at the gate of the mold can be reduced, so that the rubber raw material can be smoothly injected into the mold.
Furthermore, the included angle between the first conical hole with the angle of 100 degrees and the second conical hole with the wall of the first conical hole is less than or equal to 120 degrees. So as to obtain better stress concentration effect, and the friction resistance at the gate of the die is smaller.
Furthermore, the major diameter of the two taper holes is more than or equal to 1.8 times the minor diameter of the two taper holes. So that the area of the runner at the gate of the mold is changed to form a necking.
Furthermore, the height of the second taper hole is larger than or equal to 1mm, so that the area of a runner at the sprue of the mold is gradually changed, the area mutation of the runner is avoided, the surge flow generated during the injection of the rubber raw material is avoided, and the injection of the rubber raw material is more stable and uniform.
Further, a boss is arranged at a mold gate of the rubber mold, and an outlet of the mold gate is arranged on the top surface of the boss. The section of the glue injection head is hidden under the surface of the rubber product, and the surface of the rubber product is ensured to be flat.
Furthermore, the boss is in a round table shape, so that the structure is simplified and the processing is convenient.
Furthermore, the height of the boss is more than or equal to 3mm, so that the section of the glue injection head is hidden under the surface of the rubber product.
The invention has the beneficial effects that: the sprue of the rubber mold is designed into the hourglass-shaped necking, so that stress concentration is generated on rubber at the necking in the molding process of a rubber product, and the rubber in the necking is broken by utilizing the shrinkage force generated in the molding process of the rubber product. Thereby simplifying the structure of the rubber mould, simplifying the demoulding process, avoiding the trimming process of the glue injection head, improving the surface quality and the work efficiency of the rubber product and reducing the production cost.
Drawings
FIG. 1 is a schematic view of a gate of a conventional rubber mold,
FIG. 2 is a schematic view showing a defect caused by demolding of a rubber product,
FIG. 3 is a schematic diagram showing residues caused by demolding of a rubber product,
FIG. 4 is a schematic structural diagram of an embodiment of the present invention,
figure 5 is an enlarged view of a portion of figure 4,
FIG. 6 is a schematic view of a rubber product manufactured by using the rubber mold of the present invention,
in the figure: 1-rubber mold, 2-mold gate, 21-taper hole I, 22-taper hole II, phi D-taper hole II small end diameter, phi D-taper hole II large end diameter, A-taper hole I and taper hole II hole wall included angle, B-taper hole II height, 3-rubber product, 31-gate defect, 32-gate residue, 33-molding gate and C-boss height.
Detailed Description
The invention is further described by the following specific embodiments in conjunction with the attached drawings:
the prior art rubber mold gate is shown in fig. 1: the opening of the mold gate (2) is provided on the surface of the rubber mold (1). Because the mold gate (2) is cylindrical, the rubber in the mold gate (2) and the mold gate (2) are difficult to be separated, and the rubber on the rubber product may be pulled off by the rubber injection head during demolding, so that the rubber product is damaged (as shown in fig. 2). The glue injection head may also be torn off at a position on the surface of the rubber product, resulting in a residual defect on the surface of the rubber product (see fig. 3). Manual trimming is needed, working procedures and cost are increased, and work efficiency is reduced.
The rubber mold gate design method of the present invention is shown in fig. 4 and 5: the surface of the rubber product 1 with lower flatness requirement is selected, and the corresponding surface of the rubber mould 1 is provided with a mould sprue 2. The mold gate 2 is set as a runner with a reduced opening, and the stress concentration of the rubber at the reduced opening is realized by utilizing the stress concentration principle in the molding process of the rubber product. The shrinkage force of the rubber product during molding is utilized to break the rubber in the shrinkage port, so that the rubber injection head is automatically removed. Therefore, a cutting device arranged for cutting the glue injection head in the prior art or demoulding operation carried out for breaking the glue injection head is omitted. The rubber mold structure is simplified, the demolding procedure is simplified, the trimming procedure of the glue injection head is eliminated, the surface quality and the work efficiency of rubber products are improved, and the production cost is reduced.
The necking is realized by reducing the local flow area of the runner of the mold gate 2, a pore plate with a small hole can be arranged on the runner of the mold gate 2, the mold gate 2 in the embodiment is composed of a first taper hole 21 and a second taper hole 22 which are coaxially communicated, and the small-diameter end of the first taper hole 21 and the small-diameter end of the second taper hole 22 are connected to form an hourglass-shaped necking. The mold gate 2 can not only form stress concentration at the necking part 2, but also ensure that the rubber at the necking part can be broken when the rubber is molded and shrunk; and the frictional resistance at the mold gate 2 can be reduced, so that the rubber raw material can be smoothly injected into the mold.
In order to obtain a better stress concentration effect and reduce the frictional resistance at the mold gate 2, the included angle a between the first tapered hole 21 and the second tapered hole 22 should be greater than or equal to 100 ° and less than or equal to 120 °.
Meanwhile, the diameter phi D of the second taper hole is more than or equal to 1.8 times of the diameter phi D of the second taper hole, and the height B of the second taper hole is more than or equal to 1 mm. So as to form a better necking shape and obtain a better stress concentration effect; meanwhile, the area of the runner at the position of the mold gate 2 is gradually changed, the area mutation of the runner is avoided, the surge flow generated by the injection of rubber raw materials is avoided, and the injection of the rubber raw materials is more stable and uniform.
In the present embodiment, a boss 23 is provided outside the mold gate 2 of the rubber mold, and the outlet of the mold gate 2 is provided on the top surface of the boss 23. The boss 23 can hide the section of the glue injection head below the surface of the rubber product, so that the surface of the rubber product is ensured to be flat.
The boss 23 may take the shape of a square, rectangle, cylinder or truncated cone. In the embodiment, the boss 23 is in a truncated cone shape, the height C of the boss is larger than or equal to 3mm, and the volcano-opening-shaped mold gate 2 is formed, the shape and the structure of the mold gate 2 are simple, the processing and the demolding are convenient, and rubber is not easy to remain on a rubber mold.
The rubber mold 1 designed by the invention is adopted: during the molding process of the rubber product, stress concentration is generated at the necking part where the first taper hole 21 is connected with the second taper hole 22, and rubber at the position can shrink during molding, so that large tensile stress is generated. And the area is the smallest, and the capacity of the rubber for bearing the tensile force is the lowest. The rubber in the shrinkage can be broken by the tensile stress when the rubber shrinks, so that the rubber injection head can be automatically removed. A rubber product 3 is thus obtained as shown in fig. 6, which rubber product 3 has regular molding gates 33 that do not affect the performance.
In conclusion, the beneficial effects of the invention are as follows: the sprue of the rubber mold is designed into the hourglass-shaped necking, so that stress concentration is generated on rubber at the necking in the molding process of a rubber product, and the rubber in the necking is broken by utilizing the shrinkage force generated in the molding process of the rubber product. Thereby simplifying the structure of the rubber mould, simplifying the demoulding process, avoiding the trimming process of the glue injection head, improving the surface quality and the work efficiency of the rubber product and reducing the production cost.
The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should fall within the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (10)
1. A method for designing a rubber mold gate is characterized by comprising the following steps: by designing the shape of the gate of the rubber mold, the rubber injection head is contracted and broken by utilizing the stress concentration principle in the molding process of a rubber product, so that the structure of the rubber mold is simplified, the demolding procedure is simplified, the trimming procedure of the rubber injection head is omitted, and the surface quality and the work efficiency of the rubber product are improved.
2. The rubber mold gate designing method according to claim 1, characterized in that: the rubber mold gate is designed into a necking shape, so that stress concentration is generated on rubber at the necking in the molding process of a rubber product, and the rubber in the necking is broken by utilizing the shrinkage force of the rubber product during molding.
3. The rubber mold gate designing method as set forth in claim 2, wherein: the pouring gate is two communicating taper holes, and the small diameter ends of the two taper holes are connected to form an hourglass-shaped necking.
4. The mold gate of the rubber mold gate designing method according to any one of claims 1 to 3, comprising; rubber mold (1) and runner (2) of setting on rubber mold (1), at its characterized in that: the pouring gate (2) is composed of a first taper hole (21) and a second taper hole (22) which are coaxially communicated, and the small-diameter end of the first taper hole (21) and the small-diameter end of the second taper hole (22) are connected to form an hourglass-shaped necking.
5. The mold gate of the rubber mold gate designing method according to claim 4, characterized in that: the included angle (A) between the wall of the first taper hole (21) and the wall of the second taper hole (22) is more than or equal to 100 degrees and less than or equal to 120 degrees.
6. The mold gate of the rubber mold gate designing method according to claim 5, characterized in that: the major diameter (phi D) of the taper hole is more than or equal to 1.8.
7. The mold gate of the rubber mold gate designing method according to claim 6, characterized in that: the height (B) of the taper hole II is more than or equal to 1 mm.
8. The mold gate of the rubber mold gate designing method according to claim 4 to 7, characterized in that: a boss (23) is arranged at the pouring gate of the rubber mold, and the outlet of the pouring gate (2) is arranged on the top surface of the boss (23).
9. The mold gate of the rubber mold gate designing method according to claim 8, characterized in that: the boss (23) is in a circular truncated cone shape.
10. The mold gate of the rubber mold gate designing method according to claim 9, characterized in that: the height (C) of the boss is more than or equal to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111207860.9A CN113799341A (en) | 2021-10-18 | 2021-10-18 | Rubber mold gate design method and mold gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111207860.9A CN113799341A (en) | 2021-10-18 | 2021-10-18 | Rubber mold gate design method and mold gate |
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| Publication Number | Publication Date |
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| CN113799341A true CN113799341A (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111207860.9A Pending CN113799341A (en) | 2021-10-18 | 2021-10-18 | Rubber mold gate design method and mold gate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201913761U (en) * | 2010-12-21 | 2011-08-03 | 温州恒田模具发展有限公司 | Straight pin-point gate mould |
| CN106378907A (en) * | 2016-11-09 | 2017-02-08 | 麦迪驰杰（厦门）模具科技有限公司 | Short-stroke dispensing runner system |
| CN211917595U (en) * | 2019-12-30 | 2020-11-13 | 上海富驰高科技股份有限公司 | Sprue structure of injection mold |
| CN213227371U (en) * | 2020-08-03 | 2021-05-18 | 苏州亮宇光学科技有限公司 | Chopstick mold glue opening structure |
| CN213618095U (en) * | 2020-09-29 | 2021-07-06 | 济宁市海富电子科技有限公司 | Runner point runner structure for injection mold |
-
2021
- 2021-10-18 CN CN202111207860.9A patent/CN113799341A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201913761U (en) * | 2010-12-21 | 2011-08-03 | 温州恒田模具发展有限公司 | Straight pin-point gate mould |
| CN106378907A (en) * | 2016-11-09 | 2017-02-08 | 麦迪驰杰（厦门）模具科技有限公司 | Short-stroke dispensing runner system |
| CN211917595U (en) * | 2019-12-30 | 2020-11-13 | 上海富驰高科技股份有限公司 | Sprue structure of injection mold |
| CN213227371U (en) * | 2020-08-03 | 2021-05-18 | 苏州亮宇光学科技有限公司 | Chopstick mold glue opening structure |
| CN213618095U (en) * | 2020-09-29 | 2021-07-06 | 济宁市海富电子科技有限公司 | Runner point runner structure for injection mold |
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Application publication date: 20211217 |