Asymmetric special-shaped plastic part forming method
By designing asymmetrical special-shaped plastic parts molds, using independent hot runner shunt design and sequential valve control, the problem of the inability to produce asymmetric plastic parts on one mold in traditional technology is solved, and cost reduction and production efficiency improvement is achieved.
Patent Information
- Application Number
- CN202411477604.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2024-12-13
AI Technical Summary
Traditional design methods cannot produce two asymmetrical structure plastic parts, the middle-pull front cover and the lower-pull front cover, on one mold, resulting in the need of two sets of molds, which increases the cost and inefficiency problems.
An asymmetrical special-shaped plastic part mold was designed, using an independent hot runner split design and a sequential valve to control the feed volume and temperature, and the pouring balance of the two plastic parts was achieved through gate sleeve, main runner plate, splitter plate and oil cylinder. , reduces mold quantity and production complexity.
The production of asymmetric plastic parts in one mold is achieved, which reduces production costs, improves the consistency of production efficiency and product quality, and reduces waste rate.
Smart Images
Figure CN119116278A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of special-shaped mold forming, and in particular to a method for forming an asymmetric special-shaped plastic part. Background Art
[0002] As attached Figure 3 and attached Figure 4 As shown in the figure, the middle drawer front cover and the lower drawer front cover are the two most used plastic products on the 216 / 218 refrigerator. Since the two plastic parts are asymmetrical in structure, they are different in size and weight by 50 grams. The traditional design method is to design two sets of molds, and two injection molding machines are required for production. The injection molding machine requires a large investment, and the labor cost is rising. In addition, the market competition is increasingly fierce, and the cost is increasing sharply. How to achieve cost reduction, energy saving and efficiency improvement has become the research direction. If the conventional mold design method is adopted, it is impossible to achieve the goal of combining two molds into one mold. From the perspective of mold design structure, the sizes of the two molds are completely different, and symmetrical design cannot be performed. Secondly, the injection molding process cannot be adjusted. Because the weight of the two products differs by 50 grams, it is impossible to debug the production through the glue feeding balance process. Summary of the invention
[0003] The present invention aims to provide a method for molding an asymmetric special-shaped plastic part, so as to solve the problem that two sets of molds are used in the production of the existing middle drawer front cover and the lower drawer front cover, resulting in high cost and low efficiency.
[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an asymmetric special-shaped plastic part mold, comprising a mold body, a gate sleeve arranged at the top of the mold, and a lower draw-out front cover cavity and a middle draw-out front cover cavity respectively located at both ends of the mold, the gate sleeve is connected to a main runner plate downward, and the two ends of the main runner plate are respectively connected to a diverter plate through a hot nozzle, and the two diverter plates are respectively connected to the lower draw-out front cover cavity and the middle draw-out front cover cavity through the hot nozzle, the lower draw-out front cover cavity and the middle draw-out front cover cavity are fixedly connected with an oil cylinder, the diverter diameter of the diverter plate connected to the lower draw-out front cover cavity is 15-17mm, and the diverter diameter of the diverter plate connected to the middle draw-out front cover cavity is 13-15mm.
[0005] Further, using the mold of the asymmetric special-shaped plastic part described above to prepare the special-shaped plastic part comprises the following steps:
[0006] S1. Before pouring, reset the oil cylinder of the mold body and close the mold body;
[0007] S2, set the pouring time to 4.3-6.3S, control the feed rate through the sequence valve, control the temperature of the hot runner to 190-230℃ through the temperature sensor, inject the molten plastic from the gate sleeve into the main runner plate, and then inject the molten plastic into the lower draw front cover cavity and the middle draw front cover cavity after passing through the branch runner plate;
[0008] S3. Wait for the plastic to cool and set in the mold. The cooling temperature is 28-32℃ and the cooling time is 32-34S. After setting, open the mold body and use the oil cylinder to pull the core. After the core is pulled, take out the lower front cover and the middle front cover.
[0009] The beneficial effects of the present invention are as follows: 1. By adopting an asymmetric mold design structure, the common symmetric design problem in traditional technology is successfully solved, so that asymmetric special-shaped plastic parts can be produced in one mold, thereby reducing the number of molds and the complexity of production; 2. By using an independent hot runner diversion design, different hot runner pipe diameters are selected according to the weight of different products to control the feed amount, and then the pouring time is controlled by a sequence valve and the hot runner temperature is controlled by a temperature sensor, so that the pouring balance of two asymmetric plastic parts is achieved, ensuring the consistency and stability of product quality; 3. This method effectively reduces production costs, because there is no need to design and manufacture molds separately for each asymmetric plastic part, thereby saving the cost of mold manufacturing, and also reducing the number of injection molding machines required and reducing equipment investment; 4. Through integrated design, the production process is smoother, the production cycle is shortened, and the production efficiency is improved. At the same time, due to the optimization of the pouring process, the scrap rate of the product is reduced, further improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of a mold of an asymmetric special-shaped plastic part of the present invention;
[0011] Figure 2 It is a schematic diagram of the casting structure of a mold for an asymmetric special-shaped plastic part of the present invention;
[0012] Figure 3 This is a schematic diagram of the front cover of the center drawer;
[0013] Figure 4 This is a schematic diagram of the front cover that is pulled down. DETAILED DESCRIPTION
[0014] The following is further described in detail through specific implementation methods:
[0015] The reference numerals in the drawings of the specification include: gate sleeve 1, main runner plate 2, hot nozzle 3, branch runner plate 4, oil cylinder 5, middle draw front cover cavity 6, lower draw front cover cavity 7, and mold body 8.
[0016] The embodiment is basically as shown in the attached Figure 1 -Attached Figure 4As shown: an asymmetric special-shaped plastic part mold, including a mold body 8, a gate sleeve 1 arranged at the top of the mold, and a lower draw-out front cover cavity 7 and a middle draw-out front cover cavity 6 respectively located at the two ends of the mold, the gate sleeve 1 is connected to a main flow channel plate 2 downward, and the two ends of the main flow channel plate 2 are respectively connected to a branch flow channel plate 4 through a hot nozzle 3, and the two branch flow channel plates 4 are respectively connected to the lower draw-out front cover cavity 7 and the middle draw-out front cover cavity 6 through the hot nozzle 3, the lower draw-out front cover cavity 7 and the middle draw-out front cover cavity 6 are fixedly connected to an oil cylinder 5, the branch flow diameter of the branch flow channel plate 4 connected to the lower draw-out front cover cavity 7 is 14mm, and the branch flow diameter of the branch flow channel plate 4 connected to the middle draw-out front cover cavity 6 is 16mm.
[0017] The method of using the mold for an asymmetric special-shaped plastic part as described above to prepare a special-shaped plastic part comprises the following steps:
[0018] S1. Before pouring, the oil cylinder 5 of the mold body 8 is reset and the mold body 8 is closed;
[0019] S2, set the pouring time to 5.3S, sequence valve 1 is opened when the screw in the injection molding machine is at the position of 162mm, and is closed when the screw in the injection molding machine is at the position of 28mm, sequence valve 2 is opened when the screw in the injection molding machine is at the position of 98mm, and is closed when the screw in the injection molding machine is at the position of 52mm, and the temperature of the hot runner is controlled to be 210℃ by the temperature sensor, and the molten plastic is injected from the gate sleeve 1 into the main channel plate 2, and the molten plastic is injected into the lower draw front cover cavity 7 and the middle draw front cover cavity 6 after passing through the diverter plate 4;
[0020] S3, waiting for the plastic to cool and set in the mold, the cooling time is 33S, the cooling temperature is 30°C, after setting, open the mold body 8, use the cylinder 5 to pull the core, and after the core pulling is completed, take out the lower front cover and the middle front cover.
[0021] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. An asymmetric special-shaped plastic part mold, comprising a mold body, a sprue sleeve arranged at the top of the mold, and a lower draw front cover cavity and a middle draw front cover cavity respectively located at two ends of the mold, the sprue sleeve is connected downwardly with a main flow channel plate, and the two ends of the main flow channel plate are respectively connected with a branch flow channel plate through a hot nozzle, and the two branch flow channel plates are respectively connected with the lower draw front cover cavity and the middle draw front cover cavity through the hot nozzle, and the lower draw front cover cavity and the middle draw front cover cavity are fixedly connected with a cylinder, Features: The diameter of the runner of the runner plate connected to the lower drawer front cover cavity is 15-17 mm, and the diameter of the runner of the runner plate connected to the middle drawer front cover cavity is 13-15 mm.
2. Using the mold for an asymmetric special-shaped plastic part according to claim 1 to prepare a special-shaped plastic part, It is characterized in that The following steps are involved: S1. Before pouring, reset the oil cylinder of the mold body and close the mold body; S2. Set the pouring time to 4.3-6.3S, control the feed rate through the sequence valve, control the temperature of the hot runner to 190-230℃ through the temperature sensor, inject the molten plastic from the gate sleeve into the main runner plate, and then inject the molten plastic into the lower draw front cover cavity and the middle draw front cover cavity after passing through the runner plate; S3. Wait for the plastic to cool and set in the mold. The cooling temperature is 28-32℃ and the cooling time is 32-34S. After setting, open the mold body and use the oil cylinder to pull the core. After the core is pulled, take out the lower front cover and the middle front cover.
3. A method for forming an asymmetric special-shaped plastic part according to claim 2, Features: In the step S2, the pouring time is 5.3 seconds and the temperature of the hot runner is 210°C.
4. A method for forming an asymmetric special-shaped plastic part according to claim 3, Features: In the step S3, the cooling temperature is 30° C. and the cooling time is 33 seconds.