CN216267420U - Bilateral ejection demoulding structure of injection mould - Google Patents
Bilateral ejection demoulding structure of injection mould Download PDFInfo
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- CN216267420U CN216267420U CN202122969852.XU CN202122969852U CN216267420U CN 216267420 U CN216267420 U CN 216267420U CN 202122969852 U CN202122969852 U CN 202122969852U CN 216267420 U CN216267420 U CN 216267420U
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- 239000007924 injection Substances 0.000 title claims abstract description 27
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- 229920002302 Nylon 6,6 Polymers 0.000 description 4
- 229910001214 P-type tool steel Inorganic materials 0.000 description 3
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- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
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Abstract
A bilateral ejection demoulding structure of an injection mould comprises a fixed mould, a movable mould, an upper support guide pillar, a first upper ejector plate, a first lower ejector plate, a lower support guide pillar, a second upper ejector plate, a second lower ejector plate and a nylon rubber plug; the movable mould is arranged right below the fixed mould; a plurality of first thimbles are arranged on the first lower thimble plate, a plurality of first needle holes are arranged on the fixed die, and each first thimble penetrates through the corresponding first needle hole; the first lower ejector plate is also provided with a first return needle, the nylon rubber plug is fixed on the first return needle, and the head part of the nylon rubber plug is positioned in the mounting hole on the top surface of the movable die and is in interference fit with the inner wall of the mounting hole; and a plurality of second thimbles are arranged on the second upper thimble plate, a plurality of second needle holes are arranged on the movable mould, and each second thimble penetrates through the corresponding second needle hole. The ejection force can be applied to the molded automobile wire harness buckle plastic part from two sides of the driven mold and the fixed mold in the demolding process, so that the surface of the plastic part is ensured not to be damaged.
Description
Technical Field
The utility model relates to the technical field of molds, in particular to a bilateral ejection demolding structure of an injection mold.
Background
As is well known, an injection mold is a common mold for molding plastic parts, and various plastic parts can be molded by the injection mold to meet various requirements of people.
The automobile wiring harness buckle plastic part is a key component of an automobile wiring harness system, is an important assembly part and needs to be produced in large quantities. As shown in fig. 3, the automobile harness buckle plastic part 50 is composed of a harness seat 501, a harness movable fastener 502, an inverted disc 503, a clamping link 504 and a plurality of inverted clamping blades 505, the overall dimension of the automobile harness buckle plastic part is 40.98mm × 22.1mm × 20 mm, the average wall thickness of the product is about 1.1mm, the maximum thickness is about 3.5mm, the thinnest part is 0.5 mm of inverted clamping blade, and the volume is 1.6 × 103 mm2The size of the plastic part is smaller, but the structure is more complex, and the plastic part is required after being molded: the surface is smooth, no burr is generated, the buckle is not damaged, the clamping force reaches a preset target value, the characteristics of good mechanical strength, toughness and the like are required, and other parts have no obvious defect traces. However, because the automobile wiring harness buckle plastic part is a product with a clamping part having a circle of internal inverted hook structure characteristics and a plastic part main body section without a demoulding angle due to product structure requirements, if the mould is directly opened, a cavity part can be damaged by drawing or even can not be demoulded due to mould sticking; if the injection mold only adopts the conventional side core-pulling mechanism and the straight ejection mechanism to demold the plastic part, the surface of the plastic part is easily damaged, such as the defects of shrinking marks, burrs, ejection marks and the like, the main body section of the plastic part has no demolding angle, the clamped blade has a thin adhesive position and a small space, and a sliding block type core-pulling demolding structure cannot be adopted, so that the injection mold is obviously unsuitable.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a bilateral ejection demoulding structure of an injection mould, which can apply ejection force to a well-formed automobile wire harness buckle plastic part from two sides of a driven mould and a fixed mould in the demoulding process, so as to ensure that the surface of the automobile wire harness buckle plastic part cannot be damaged. The technical scheme is as follows:
a bilateral ejection demoulding structure of an injection mould comprises a fixed mould and a movable mould which are matched, wherein the movable mould is arranged right below the fixed mould; the method is characterized in that: the double-side ejection demoulding structure further comprises an upper support guide pillar, a first upper ejector plate, a first lower ejector plate, a lower support guide pillar, a second upper ejector plate, a second lower ejector plate and at least one nylon rubber plug, wherein the upper support guide pillar is installed on the fixed mould and positioned on the upper side of the fixed mould, the first upper ejector plate and the first lower ejector plate can be both slidably installed on the upper support guide pillar, the first lower ejector plate is positioned below the first upper ejector plate, a plurality of first thimbles are arranged on the first lower ejector plate, a plurality of first needle holes are arranged at corresponding positions of the fixed mould, and each first thimble passes through the corresponding first needle hole; the first lower ejector plate is also provided with at least one first return needle, the nylon rubber plugs are fixed on the corresponding first return needles, the top surface of the movable die is provided with at least one mounting hole, the number of the mounting holes is the same as that of the nylon rubber plugs, the mounting holes correspond to the nylon rubber plugs one by one, and the heads of the nylon rubber plugs are positioned in the corresponding mounting holes and are in interference fit with the inner walls of the mounting holes; the lower supporting guide pillar is installed on the movable mould and located at the lower side of the movable mould, the second upper ejector plate and the second lower ejector plate are slidably installed on the lower supporting guide pillar, the second lower ejector plate is located below the second upper ejector plate, a plurality of second ejector pins are arranged on the second upper ejector plate, a plurality of second needle holes are formed in corresponding positions of the movable mould, and each second ejector pin penetrates through the corresponding second needle hole.
Generally, the fixed mold is mounted on a fixed mold seat of the injection mold, and the upper support guide pillar is arranged between the fixed mold seat and the fixed mold; the movable mould is arranged on a movable mould seat of the injection mould through mould feet, and the lower support guide pillar is arranged between the movable mould seat and the movable mould. The fixed mold forms a cavity part of the injection mold, the fixed mold is used for molding the glue position of the upper half part of the product, and the flow channel passes through the lower surface of the fixed mold; the movable mold forms a core part of the injection mold, the movable mold is used for molding the lower half part of a product, and the runner passes through the upper surface of the movable mold.
Typically, the material selected for injection molding automotive wiring harness snap molding is PA66 (BASF Ultramid A3K) having a density of 1.13g/cm3The shrinkage rate is 1-2%, the temperature range of the die forming is 40-60 ℃, the temperature range of the melt is 280-300 ℃, the high-strength high-hardness high-heat-resistance high-electric-insulation material has high mechanical strength and hardness, high heat resistance, low friction, good rapid running capability, wear resistance, noise and vibration reduction, and excellent processability[。
After the injection mold finishes injection molding of the automobile wiring harness buckle plastic part, when the mold is opened, the movable mold moves downwards under the action of mold opening force of an injection molding machine to be separated from the fixed mold, and because the head of the nylon rubber plug is in interference fit with the inner wall of the mounting hole on the movable mold, the nylon rubber plug moves downwards along with the movable mold under the action of friction force and drives the first upper ejector plate and the first lower ejector plate to move downwards together through the first return pin, each first ejector pin on the first lower ejector plate moves downwards along the corresponding first pin hole respectively to generate downward ejection action on the automobile wiring harness buckle plastic part in the fixed mold, so that the mold sticking force of the plastic part due to no demolding angle can be eliminated by utilizing the action of ejection force, and the automobile wiring harness buckle plastic part can be smoothly separated from the fixed mold; subsequently, the movable mold continues to move downwards under the action of the mold opening force of the injection molding machine until the first lower ejector plate is contacted with the fixed mold, the nylon rubber plug is separated from the mounting hole of the driven mold under the action of the first return pin, after the mold opening action is completed, the second upper ejector plate and the second lower ejector plate move upwards under the action force of the ejector rod of the injection molding machine, each second ejector pin on the second upper ejector plate moves upwards along the corresponding second needle hole respectively, upward pushing action force is generated on an automobile wire harness buckle plastic part in the movable mold, and ejection is completed under the limitation of the movable mold, so that the automobile wire harness buckle plastic part can be taken out smoothly. According to the bilateral ejection demolding structure of the injection mold, ejection force can be applied to a molded automobile wire harness buckle plastic part from two sides of the movable mold and the fixed mold in the demolding process, and the automobile wire harness buckle plastic part can be prevented from being damaged due to forced demolding by utilizing the action of the ejection force and the high mechanical strength and high hardness of a PA66 material.
Generally, the movable mold and the fixed mold are made of pre-hard plastic mold steel ASSAB 718, the pre-hard plastic mold steel ASSAB 718 has excellent mechanical property, processability, high hardenability, good electromachining property, dermatoglyph processability and excellent polishing property, and is particularly suitable for mass production of plastic molds, and the factory hardness of the plastic molds is B290-310.
In the preferred scheme, a limiting block is arranged on the second upper ejector plate and is positioned below the movable die and matched with the movable die. During operation, the second upper ejector pin plate and the second lower ejector pin plate move upwards under the action force of the ejector rod of the injection molding machine, the automobile wire harness buckle plastic part in the movable mold is pushed upwards by the aid of the second ejector pins on the second upper ejector pin plate until the limiting block contacts with the movable mold, and ejection of the automobile wire harness buckle plastic part is completed.
In the preferred scheme, still be equipped with many back needles down on the thimble board on the second, the cover is equipped with compression spring on the back needle down, and compression spring is in between ejector plate on movable mould and the second, compression spring's upper end and movable mould in close contact with, compression spring's lower extreme and ejector plate in close contact with on the second. When the mold is opened, the second upper ejector plate and the second lower ejector plate move upwards under the action of an ejector rod of the injection molding machine, and a compression spring sleeved on the lower return needle is compressed upwards under the action of an ejection force; when the mold is closed in the mold opening state, the ejector rod on the injection molding machine is recovered, the compression spring in the compression state returns to deform and releases elastic potential energy, and the second upper ejector plate and the second lower ejector plate return along with the return and drive the lower return pin fixed on the second upper ejector plate and each second ejector pin to return; then, moving the mold upwards to match the fixed mold continuously until the lower back stitch is closed by contacting the end face of the fixed mold; meanwhile, the nylon rubber plug is inserted into the mounting hole of the movable mold, the first return pin also starts to be contacted and closed with the end face of the movable mold, the first upper ejector plate and the first lower ejector plate also return along with the nylon rubber plug, and finally the parting surface is closed.
In an optimized scheme, the bilateral ejection demoulding structure further comprises a plurality of guide columns and a plurality of guide sleeves, each guide column is installed on the movable mould, and each guide sleeve is installed on the fixed mould and is respectively sleeved on the corresponding guide column. By adopting the structure, the relative motion of the movable mould and the fixed mould can be more stable through the matching between each guide post and each guide sleeve.
Compared with the prior art, the utility model has the following advantages:
the bilateral ejection demolding structure can apply ejection force to the molded automobile wiring harness buckle plastic part from two sides of the driven mold and the fixed mold in the demolding process, and the plastic part can be prevented from being damaged due to forced demolding by utilizing the action of the ejection force and the high mechanical strength and high hardness of the PA66 material.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a schematic structural diagram of the snap-fit plastic part of the automobile wiring harness.
Detailed Description
As shown in fig. 1 and 2, the double-side ejection demoulding structure of the injection mould comprises a fixed mould 1 and a movable mould 2 which are matched with each other, wherein the movable mould 2 is arranged right below the fixed mould 1; the bilateral ejection demoulding structure further comprises an upper support guide pillar 3, a first upper ejector plate 4, a first lower ejector plate 5, a lower support guide pillar 6, a second upper ejector plate 7, a second lower ejector plate 8 and at least one nylon rubber plug 9, wherein the upper support guide pillar 3 is arranged on the fixed mould 1 and positioned on the upper side of the fixed mould 1, the first upper ejector plate 4 and the first lower ejector plate 5 can be slidably arranged on the upper support guide pillar 3, the first lower ejector plate 5 is positioned below the first upper ejector plate 4, a plurality of first ejector pins 51 are arranged on the first lower ejector plate 5, a plurality of first needle holes 101 are arranged at corresponding positions of the fixed mould 1, and each first ejector pin 51 respectively penetrates through the corresponding first needle hole 101; the first lower ejector plate 5 is also provided with at least one first return needle 52, the nylon rubber plugs 9 are fixed on the corresponding first return needles 52, the top surface of the movable mold 2 is provided with at least one mounting hole 201, the number of the mounting holes 201 is the same as that of the nylon rubber plugs 9, the mounting holes 201 correspond to the nylon rubber plugs 9 one by one, and the heads of the nylon rubber plugs 9 are positioned in the corresponding mounting holes 201 and are in interference fit with the inner walls of the mounting holes 201; the lower support guide pillar 6 is installed on the moving die 2 and located on the lower side of the moving die 2, the second upper ejector plate 7 and the second lower ejector plate 8 can be slidably installed on the lower support guide pillar 6, the second lower ejector plate 8 is located below the second upper ejector plate 7, a plurality of second ejectors 71 are arranged on the second upper ejector plate 7, a plurality of second needle holes 202 are arranged at corresponding positions of the moving die 2, and each second ejector 71 penetrates through the corresponding second needle hole 202.
In the embodiment, the material selected for injection molding of the snap molding 60 for automotive wiring harness is PA66 (BASF Ultramid A3K), and the density of the material is 1.13g/cm3The shrinkage rate is 1-2%, the temperature range of the die forming is 40-60 ℃, the temperature range of the melt is 280-300 ℃, the high-strength high-hardness high-heat-resistance high-electric-insulation material has high mechanical strength and hardness, high heat resistance, low friction, good rapid running capability, wear resistance, noise and vibration reduction, and excellent processability[。
In the embodiment, the movable mold 2 and the fixed mold 1 are made of pre-hard plastic mold steel ASSAB 718, which has excellent mechanical properties, processability, high hardenability, good electromachining properties, dermatoglyph processability and excellent polishing properties, and is particularly suitable for mass production of plastic molds, and the factory hardness of the plastic molds is B290-310.
In this embodiment, the second upper ejector plate 7 is provided with a stopper 72, and the stopper 72 is located below the moving mold 2 and is engaged with the moving mold 2. During operation, the second upper ejector plate 7 and the second lower ejector plate 8 move upwards under the action of the ejector rod of the injection molding machine, and the second ejector pins 71 on the second upper ejector plate 7 generate upward ejection action force on the automobile wire harness buckle plastic part 60 in the movable mold 2 until the limiting block 72 contacts with the movable mold 2, so that ejection of the automobile wire harness buckle plastic part 60 is completed.
In this embodiment, the second upper ejector plate 7 is further provided with a plurality of lower return pins 73, the lower return pins 73 are sleeved with compression springs 11, the compression springs 11 are located between the movable mold 2 and the second upper ejector plate 7, the upper ends of the compression springs 11 are in close contact with the movable mold 2, and the lower ends of the compression springs 11 are in close contact with the second upper ejector plate 7. When the mold is opened, the second upper ejector plate 7 and the second lower ejector plate 8 move upwards under the action of an ejector rod of the injection molding machine, and the compression spring 11 sleeved on the lower return needle 73 is compressed upwards under the action of ejection force; when the mold is closed in the mold opening state, the ejector rod on the injection molding machine is recovered, the compression spring 11 in the compression state is restored and deformed and releases elastic potential energy, and the second upper ejector plate 7 and the second lower ejector plate 8 return along with the return and drive the lower return needle 73 and each second ejector 71 fixed on the second upper ejector plate to return; subsequently, the movable mold 2 moves upwards to be matched with the fixed mold 1 continuously until the lower back stitch 73 is contacted and closed with the end face of the fixed mold 1; meanwhile, the nylon rubber plug 9 is inserted into the mounting hole 201 of the movable mold 2, the first return needle 52 also starts to be closed in contact with the end face of the movable mold 2, the first upper ejector plate 4 and the first lower ejector plate 5 also return along with the end face of the movable mold, and finally the parting surface is closed.
The bilateral ejection demoulding structure of the embodiment further comprises a plurality of guide columns 12 and a plurality of guide sleeves 13, wherein each guide column 12 is installed on the movable mould 2, and each guide sleeve 13 is installed on the fixed mould 1 and is respectively sleeved on the corresponding guide column 12. With the structure, the relative movement of the movable mould 2 and the fixed mould 1 can be more stable through the matching between each guide post 12 and each guide sleeve 13.
The working principle of the injection mold with the double-side ejection demolding structure is briefly described as follows:
the fixed mold 1 is arranged on a fixed mold base 30 of the injection mold, and the upper support guide pillar 3 is arranged between the fixed mold base 30 and the fixed mold 1; the movable mould 2 is arranged on a movable mould seat 50 of the injection mould through mould feet 40, and the lower support guide pillar 6 is arranged between the movable mould seat 50 and the movable mould 2. The fixed mold 1 forms a cavity part of the injection mold, the fixed mold 1 is used for molding the glue position of the upper half part of a product, and the flow channel passes through the lower surface of the fixed mold 1; the movable mold 2 constitutes a core portion of the injection mold, the movable mold 2 is used for molding a lower half portion of a product, and the runner passes on an upper surface of the movable mold 2.
After the injection mold finishes injection molding of the automobile wiring harness buckle plastic part 60, when the mold is opened, the movable mold 2 moves downwards under the action of mold opening force of an injection molding machine to be separated from the fixed mold 1, and because the head of the nylon rubber plug 9 is in interference fit with the inner wall of the mounting hole 201 on the movable mold 2, the nylon rubber plug 9 moves downwards along with the movable mold 2 under the action of friction force, and drives the first upper ejector pin plate 4 and the first lower ejector pin plate 5 to move downwards together through the first return pin 52, each first ejector pin 51 on the first lower ejector pin plate 5 moves downwards along the corresponding first needle hole 101 respectively, and pushes the automobile wiring harness buckle plastic part 60 in the fixed mold 1 downwards, so that the mold sticking force of the plastic part due to no demolding angle can be eliminated by utilizing the action of pushing force, and the automobile wiring harness buckle plastic part 60 can be smoothly separated from the fixed mold 1; subsequently, the movable mold 2 continues to move downwards under the action of the mold opening force of the injection molding machine until the first lower ejector plate 5 contacts the fixed mold 1, the nylon rubber plug 9 is separated from the mounting hole 201 of the movable mold 2 under the action of the first return needle 52, after the mold opening action is completed, the second upper ejector plate 7 and the second lower ejector plate 8 move upwards under the action of the ejector rod of the injection molding machine, each second ejector pin 71 on the second upper ejector plate 7 moves upwards along the corresponding second needle hole 202 respectively, upward acting force is generated on the automobile wire harness buckle plastic part 60 in the movable mold 2, ejection is completed under the limitation of the movable mold 2, and the automobile wire harness buckle plastic part 60 can be smoothly taken out.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and the equivalent or simple change of the structure, the characteristics and the principle described in the present patent idea is included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the utility model as defined in the accompanying claims.
Claims (4)
1. A bilateral ejection demoulding structure of an injection mould comprises a fixed mould and a movable mould which are matched, wherein the movable mould is arranged right below the fixed mould; the method is characterized in that: the double-side ejection demoulding structure further comprises an upper support guide pillar, a first upper ejector plate, a first lower ejector plate, a lower support guide pillar, a second upper ejector plate, a second lower ejector plate and at least one nylon rubber plug, wherein the upper support guide pillar is installed on the fixed mould and positioned on the upper side of the fixed mould, the first upper ejector plate and the first lower ejector plate can be both slidably installed on the upper support guide pillar, the first lower ejector plate is positioned below the first upper ejector plate, a plurality of first thimbles are arranged on the first lower ejector plate, a plurality of first needle holes are arranged at corresponding positions of the fixed mould, and each first thimble passes through the corresponding first needle hole; the first lower ejector plate is also provided with at least one first return needle, the nylon rubber plugs are fixed on the corresponding first return needles, the top surface of the movable die is provided with at least one mounting hole, the number of the mounting holes is the same as that of the nylon rubber plugs, the mounting holes correspond to the nylon rubber plugs one by one, and the heads of the nylon rubber plugs are positioned in the corresponding mounting holes and are in interference fit with the inner walls of the mounting holes; the lower supporting guide pillar is installed on the movable mould and located at the lower side of the movable mould, the second upper ejector plate and the second lower ejector plate are slidably installed on the lower supporting guide pillar, the second lower ejector plate is located below the second upper ejector plate, a plurality of second ejector pins are arranged on the second upper ejector plate, a plurality of second needle holes are formed in corresponding positions of the movable mould, and each second ejector pin penetrates through the corresponding second needle hole.
2. The double-sided ejection and demolding structure of an injection mold as claimed in claim 1, wherein: and a limiting block is arranged on the second upper ejector plate and is positioned below the movable die and matched with the movable die.
3. The double-sided ejection and demolding structure of an injection mold as claimed in claim 1, wherein: the second upper ejector plate is also provided with a plurality of lower return pins, compression springs are sleeved on the lower return pins and located between the movable mold and the second upper ejector plate, the upper ends of the compression springs are in close contact with the movable mold, and the lower ends of the compression springs are in close contact with the second upper ejector plate.
4. A double-sided ejector and stripper structure for injection molds according to any of claims 1-3, wherein: the bilateral ejection demoulding structure further comprises a plurality of guide posts and a plurality of guide sleeves, each guide post is installed on the movable mould, and each guide sleeve is installed on the fixed mould and is respectively sleeved on the corresponding guide post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122969852.XU CN216267420U (en) | 2021-11-30 | 2021-11-30 | Bilateral ejection demoulding structure of injection mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122969852.XU CN216267420U (en) | 2021-11-30 | 2021-11-30 | Bilateral ejection demoulding structure of injection mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216267420U true CN216267420U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122969852.XU Expired - Fee Related CN216267420U (en) | 2021-11-30 | 2021-11-30 | Bilateral ejection demoulding structure of injection mould |
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| Country | Link |
|---|---|
| CN (1) | CN216267420U (en) |
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2021
- 2021-11-30 CN CN202122969852.XU patent/CN216267420U/en not_active Expired - Fee Related
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