CN215359823U - Lightweight blow molding die - Google Patents
Lightweight blow molding die Download PDFInfo
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- CN215359823U CN215359823U CN202121118097.8U CN202121118097U CN215359823U CN 215359823 U CN215359823 U CN 215359823U CN 202121118097 U CN202121118097 U CN 202121118097U CN 215359823 U CN215359823 U CN 215359823U
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Abstract
The utility model belongs to the technical field of blow molding, and relates to a lightweight blow molding die, which comprises a die core front die and a die core rear die buckled with the die core front die; a die cavity is formed between the die core front die and the die core rear die; the lightweight blow mold further comprises a lightweight structure arranged outside the mold core front mold and/or the mold core rear mold. The utility model provides a light blow mold which is light in self weight, short in processing period and low in cost.
Description
Technical Field
The utility model belongs to the technical field of blow molding, relates to a blow mold, and particularly relates to a light-weight blow mold.
Background
Blow molding is a process for making hollow thermoplastic articles commonly used to prepare bottles, pails, cans, cases and all containers for packaging food, beverages, cosmetics, pharmaceuticals and commodity products. The blow molding process includes heating tubular or barrel-shaped plastic parison to soften, setting in blow mold, closing the mold, introducing compressed air to the parison to expand the parison to cling to the inner wall of the mold, cooling and demolding to obtain hollow plastic product. The molds used for blow molding are usually divided into mold cores, mold bases and other mechanisms, and are formed by milling metal blocks or plates, most molds are not provided with cooling systems, and few molds are provided with cooling channels formed by drilling and used as cooling systems.
Most of the existing blow molds are made of metal materials or plates, and have a solid structure, a large number of parts and a heavy weight. Has the following disadvantages: 1) the whole die has heavy weight, consumes more materials, has higher requirements on a die power system, and does not accord with the whole development trend of the manufacturing industry of energy conservation, green and environmental protection; 2) the processing cycle is long, and the processing cycle is a serious bottleneck especially on the production efficiency of large-batch consumer product packaging; 3) the number of components is large, the installation and maintenance efficiency is low, and the cost is high; 4) the non-cooling system or the cooling system is simple, the cooling efficiency is low when the plastic parts are produced, and the cooling effect of different parts is uneven, so that the production cycle of the blow-molding product is long and the yield is low.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems in the prior art, the utility model provides a light blow mold which has light dead weight, short processing period and low cost.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a lightweight blow molding die comprises a die core front die and a die core rear die buckled with the die core front die; a die cavity is formed between the die core front die and the die core rear die; the method is characterized in that: the lightweight blow molding mold further comprises a lightweight structure arranged outside the mold core front mold and/or the mold core rear mold.
The lightweight structure is a physical structure formed by a 3D printing method.
The lightweight structure is a cross partition plate structure, a three-dimensional hollow dot matrix structure and/or a topological structure formed in a 3D printing mode.
When the lightweight structure is a cross partition plate structure, the wall thickness of the cross partition plate is not more than 6 mm; the included angle between each partition plate in the crossed partition plates and the horizontal plane is theta, and theta is larger than 45 degrees and smaller than 60 degrees.
When the lightweight structure is a three-dimensional hollowed-out lattice structure, the three-dimensional hollowed-out lattice structure is a regular dodecahedron structure, and the outer diameter of the regular dodecahedron structure is 30 mm; the rod diameter in the regular dodecahedron structure is not more than 3 mm.
When the lightweight structure is a topological structure, the topological structure is a physical structure designed according to the most reasonable path obtained by the mechanical simulation of the mode locking and blow molding process.
The lightweight blow molding die further comprises a cooling flow channel arranged outside the die core front die and/or the die core rear die.
The cooling flow channel is coiled outside the front mold core and/or the rear mold core.
The lightweight blow molding die further comprises a bottom film arranged at the end part of the front die core and/or the end part of the rear die core.
The utility model has the advantages that:
the utility model provides a lightweight blow molding die which comprises a die core front die and a die core rear die buckled with the die core front die; a die cavity is formed between the die core front die and the die core rear die; the lightweight blow mold further comprises a lightweight structure arranged outside the mold core front mold and/or the mold core rear mold, and the lightweight structure is a physical structure formed in a 3D printing mode. The light-weight blow molding die developed by the utility model brings the improvements in aspects of energy conservation, environmental protection, production efficiency, die processing period, product quality and the like for the plastic packaging manufacturing link on the basis of meeting the basic functional requirements of the blow molding process.
Drawings
FIG. 1 is a schematic view of the overall structure of a lightweight blow mold according to the present invention;
FIG. 2 is an exploded view of a lightweight blow mold according to the present invention;
FIG. 3 is a schematic structural view of the present invention using cross ribs as a lightweight structure;
FIG. 4 is a schematic structural diagram of the present invention using a three-dimensional lattice as a lightweight structure;
FIG. 5 is a schematic structural view of the present invention using a topological structure as a light weight structure;
wherein:
1-mold core front mold; 2-cooling the flow channel; 3-lightweight structure; 4-blow molding products; 5-bottle basement membrane; 6-a die cavity; and 7, molding core back mold.
Detailed Description
Referring to fig. 1 and 2, the utility model provides a lightweight blow molding mold, which comprises a mold core front mold 1 and a mold core rear mold 7 buckled with the mold core front mold 1; a mold cavity 6 for forming the blow molding product 4 is formed between the mold core front mold 1 and the mold core rear mold 7; the lightweight blow mold further comprises a lightweight structure 3 arranged outside the front mold core 1 and/or the rear mold core 7, and the lightweight structure 3 is a physical structure formed by a 3D printing mode. Additive manufacturing (3D printing, prior art) technology is a digital process with high flexible processing capability; complex anisotropic structures can be manufactured which cannot be achieved by conventional milling. Die cavity: the outer surface shape of a plastic product is taken as the inner surface of a mold cavity, the equal wall thickness is 2-10 mm, the specific thickness is determined by simulation measurement and calculation by taking the blowing pressure, the whole structure of the mold and the material of the mold as boundary conditions.
The blow mold designed by the utility model is manufactured by adopting an additive manufacturing (3D printing) process, and can be prepared from steel and aluminum materials. In the specific case, the mold material and structure are comprehensively evaluated and determined according to the mechanical performance requirements of the blow molding product material and structure, mold clamping force, blow molding force and the like, and the heat conduction requirement in the blow molding process. If the size of the blow-molded product or the area of the bottle bottom is larger, the bottle bottom mold can also be designed and manufactured by adopting the scheme of the utility model. Before preparation, the designed blow molding die three-dimensional model is subjected to data processing, and process allowance is added. The inner surface of the die cavity is left with a machining allowance of about 0.5mm, and the cooling runner interface and the mounting hole in the light weight structure are left with allowance or bottom holes. The mold cavity, the cooling runner and the light-weight structure are integrally printed and formed. And after the process allowance is added, setting process parameters such as laser power, scanning speed, scanning interval, powder layer thickness and the like required by production, and generating a slicing file. And importing the slice file into 3D printing equipment for production. After printing is finished, the position of the allowance and the bottom hole is processed by a traditional milling method to obtain the dimensional precision and the surface roughness required by blow molding and assembly. After the processing is finished, the blow molding die is connected with the inlet and the outlet of the cooling water path and is installed with the bottle neck mold, the bottle bottom mold and the back plate to form a whole set of blow molding die system.
The lightweight structure 3 is a cross partition plate structure, a three-dimensional hollow lattice structure and/or a topological structure formed by a 3D printing mode. The lightweight structure extends to the backplate by the die cavity back or runner outer wall, as the main bearing structure of preceding back mould mode locking and during operation. The cross partition plates and the three-dimensional lattice are arranged in reasonable directions and angles, wall thicknesses and thicknesses, so that the self-forming die can be self-formed in the additive manufacturing (3D printing) process, and sufficient strength can be provided between the die cavity and the back plate. Compared with the thick and big entity of the traditional blow molding die, the self weight can be greatly reduced, and the load requirement of the molding press is reduced. The lightweight structure comprises mounting hole sites connected with the back plate. When the lightweight structure 3 is a cross partition structure, the wall thickness of the cross partition is not more than 6 mm; the included angle between each partition board in the crossed partition boards and the horizontal plane is theta, and theta is more than 45 degrees and less than 60 degrees. When the lightweight structure 3 is a three-dimensional hollowed-out lattice structure, the three-dimensional hollowed-out lattice structure is a regular dodecahedron structure, and the outer diameter of the regular dodecahedron structure is 30 mm; the rod diameter in the regular dodecahedron structure is not more than 3 mm. When the lightweight structure 3 is a topological structure, the topological structure is a physical structure designed according to the most reasonable path obtained by the mechanical simulation of the mode locking and blow molding process.
The lightweight blow molding die provided by the utility model further comprises a cooling runner 2 arranged outside the front die core 1 and/or the rear die core 7. The cooling flow channel 2 is coiled outside the front core die 1 and/or the rear core die 7. The cooling runner is tightly attached to the back surface of the die cavity, is arranged along the die cavity according to the shape and curvature of the die cavity profile in a surrounding mode, covers the surface of the whole die cavity, and is preferably 3-5 mm in the wall thickness of the runner. So that the effective cooling range covers the whole blow molding product surface, and the cooling efficiency can be maximally improved. Because the mold cavity has the same wall thickness and the cooling runner is also along with the mold, the distance between the cooling runner and the surface of the blow molding product is integrally consistent, the uniform cooling effect can be realized, the inconsistent mold temperatures of different areas can be avoided, the deformation of the blow molding product caused by the cooling temperature difference can be avoided, and the product yield can be greatly improved.
The lightweight blow mold further includes a bottom film 5 provided at an end of the core front mold 1 and/or an end of the core rear mold 7.
The technical solution provided by the present invention will be described in detail below with reference to the accompanying drawings:
example 1
Referring to fig. 3, the lightweight blow molding die provided by the utility model is a front die part (a rear die is symmetrical to the front die part) of a two-cavity die, the used material is stainless steel, a die cavity, a following cooling water channel and a lightweight structure are integrated, the lightweight structure is designed into a cross rib plate form, mounting hole sites are reserved at four corners of the die, and the mounting holes can be connected with a die back plate after being subjected to finish machining; the waterway interface of the mold can be communicated with a water inlet and a water outlet on the back plate of the mold after finish machining.
The wall thickness of the mold cavity is 6mm, so that enough mold cavity strength is ensured, and the blow molding pressure is borne; the wall thickness of the water channel is 5mm, the distance between the water channel and the inner surface of the die cavity is also 5mm, the water channel and the die cavity are uniformly attached, and the overall cooling efficiency and uniformity of the die cavity are guaranteed. The wall thickness of the crossed partition plate with the light-weight structure is 6mm, the inclination angle is 60 degrees, no support needs to be added in the 3D printing process, and free forming can be achieved.
The integral mold system prepared according to this scheme was only 15.9% (12.9kg/81kg) of the conventional working mold.
Example 2
Referring to fig. 4, the lightweight blow molding die provided by the utility model is a front die part (a rear die is symmetrical to the front die part) of a two-cavity die, the used material is stainless steel, a die cavity, a follow-up cooling water path and a lightweight structure are integrated, the lightweight structure is designed into a three-dimensional lattice form, mounting hole sites are reserved at four corners of the die, and the mounting holes can be connected with a die back plate after being subjected to finish machining; the waterway interface of the mold can be communicated with a water inlet and a water outlet on the back plate of the mold after finish machining.
The wall thickness of the mold cavity is 8mm, so that the sufficient mold cavity strength is ensured, and the blow molding pressure is borne; the wall thickness of the water channel is 5mm, the distance between the water channel and the inner surface of the die cavity is 5mm, the water channel and the die cavity are uniformly attached, and the overall cooling efficiency and uniformity of the die cavity are guaranteed. The three-dimensional lattice rod diameter of lightweight structure is 3mm, and the constitutional unit size is 30mm, and regular dodecahedron structure need not to add the support at 3D printing in-process, but free forming.
The integral mold system prepared according to this scheme had only 14.6% of the conventional tooling mold (11.8kg/81 kg).
Example 3
Referring to fig. 5, the light-weight blow molding mold provided by the utility model is a front mold part (a rear mold is symmetrical to the front mold) of a two-cavity mold, the used material is stainless steel, a mold cavity, a follow-up cooling water path and a light-weight structure are integrated, and the light-weight structure is designed into a topological structure form. Mounting hole positions are reserved at four corners of the die, and the mounting holes can be connected with a die back plate after being finely processed; the waterway interface of the mold can be communicated with a water inlet and a water outlet on the back plate of the mold after finish machining.
The wall thickness of the mold cavity is 8mm, so that the sufficient mold cavity strength is ensured, and the blow molding pressure is borne; the wall thickness of the water channel is 5mm, the distance between the water channel and the inner surface of the die cavity is 5mm, the water channel and the die cavity are uniformly attached, and the overall cooling efficiency and uniformity of the die cavity are guaranteed. The topological structure of the lightweight structure is designed according to the most reasonable path obtained by the mechanical simulation of the mode locking and blow molding process. Support is required to be added in the 3D printing process for forming, and the support can be removed after forming.
The integral mold system prepared according to this scheme was only 14.2% of the conventional tooling mold (11.5kg/81 kg).
Claims (9)
1. A lightweight blow molding die comprises a die core front die (1) and a die core rear die (7) buckled with the die core front die (1); a die cavity (6) is formed between the die core front die (1) and the die core rear die (7); the method is characterized in that: the lightweight blow molding die further comprises a lightweight structure (3) arranged outside the front die core (1) and/or the rear die core (7).
2. The lightweight blow mold according to claim 1, characterized in that: the lightweight structure (3) is a physical structure formed by a 3D printing method.
3. The lightweight blow mold according to claim 2, characterized in that: the lightweight structure (3) is a cross partition plate structure, a three-dimensional hollow lattice structure and/or a topological structure formed in a 3D printing mode.
4. The lightweight blow mold according to claim 3, characterized in that: when the lightweight structure (3) is a cross partition plate structure, the wall thickness of the cross partition plate is not more than 6 mm; the included angle between each partition plate in the crossed partition plates and the horizontal plane is theta, and theta is larger than 45 degrees and smaller than 60 degrees.
5. The lightweight blow mold according to claim 3, characterized in that: when the lightweight structure (3) is a three-dimensional hollowed-out lattice structure, the three-dimensional hollowed-out lattice structure is a regular dodecahedron structure, and the outer diameter of the regular dodecahedron structure is 30 mm; the rod diameter in the regular dodecahedron structure is not more than 3 mm.
6. The lightweight blow mold according to claim 3, characterized in that: when the lightweight structure (3) is a topological structure, the topological structure is a physical structure designed according to the most reasonable path obtained by the mechanical simulation in the mode locking and blow molding process.
7. The lightweight blow mold according to any one of claims 1 to 6, characterized in that: the lightweight blow molding die further comprises a cooling runner (2) arranged outside the die core front die (1) and/or the die core rear die (7).
8. The lightweight blow mold according to claim 7, characterized in that: the cooling flow channel (2) is coiled outside the front mold core (1) and/or the rear mold core (7).
9. The lightweight blow mold according to claim 8, characterized in that: the lightweight blow molding die further comprises a bottom film (5) arranged at the end part of the front die core (1) and/or the end part of the rear die core (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121118097.8U CN215359823U (en) | 2021-05-24 | 2021-05-24 | Lightweight blow molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121118097.8U CN215359823U (en) | 2021-05-24 | 2021-05-24 | Lightweight blow molding die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215359823U true CN215359823U (en) | 2021-12-31 |
Family
ID=79631287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121118097.8U Active CN215359823U (en) | 2021-05-24 | 2021-05-24 | Lightweight blow molding die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215359823U (en) |
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2021
- 2021-05-24 CN CN202121118097.8U patent/CN215359823U/en active Active
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