Thermostat front shell injection mold
The product diagram of the front shell of the temperature controller is shown in Figure 1. The maximum size of the product is 365.00 mm x 230.00 mm x 54.00 mm, the average thickness of the plastic part is 2.72 mm, the material of the plastic part is ABS, the shrinkage rate is 1.005, and the quality of the plastic part It is 311.40 grams. The technical requirements for plastic parts are that there must be no defects such as peaks, dissatisfaction with injection molding, flow lines, pores, warpage deformation, silver streaks, cold materials, jet lines, etc.
It can be seen from Figure 1 that the structure of the plastic part is a closed shell, and the two ends have one and two side through holes respectively. It is necessary to design the front mold slider to pull the core. The edge of the plastic part has a ring of notches, which is completely anastomosed with the other part. There are two round holes on the top of the plastic part, and the edge of the round hole has a bone position facing the movable mold. The top of the plastic part is the appearance surface, and there is an assembly stopper around the edge, which is also a part of the appearance with higher requirements. Therefore, the location of the gate design can only be selected in a round hole at the top.
This is a set of molds based on the British NB400-ton injection molding machine. Due to the large size of the product and the need to design slider cores on both sides of the sky and the earth, the mold design cavity ranking is 1 out of 1, and the mold base is a non-standard mold base 4560, the size of the panel and the bottom plate is large, which acts as a code template. The bottom of the two boards is designed with two code mold slots. The opening width of the slot is 54 and the bottom is R20. Cooperate, play the role of bearing the weight when coding the mold. The code mold support block of the NB injection molding machine is divided into two pieces, which are arranged on both sides of the template. There is one positioning block for the large-scale mold in Japan, which is arranged in the center of the mold. This is the biggest difference between British NB injection molding machines and Japanese injection molding machines in terms of code patterns.
For small molds, the code mold method can be a method of pressing the code mold with a pressing plate, and a method of fixing the screw on the top surface of the template to tighten it. The various methods are not much different, just different from the user's injection molding machine design habits. For large molds, the coding method will affect the efficiency of mold replacement, and will affect the safety of the coding operation, and effectively protect the mold. Now many large-scale mold injection manufacturers in the world have invented quick-change mold systems, as well as electromagnetic code mold systems. For these advanced technologies, it is worth learning and researching.
After the movable and fixed mold panel and the bottom plate are enlarged, in addition to facilitating the coding of the mold, it can also play a role in supporting the mold to omit the mold foot. Because of the need to design the slider core-pulling on the world side of the mold, there is no space to design the taper positioning block. Two taper positioning blocks perpendicular to each other are respectively designed on the left and right sides. The movable mold and the fixed mold are respectively designed with positioning pins. A U-shaped prying slot must be designed between the two templates that are in contact with each other to facilitate the disassembly of the mold. See figure 2 of the mold design.
When the size of the plastic part is large, the design of the front and rear mold cores is very important. The front and rear mold cores belong to the core part of the mold, and their processing volume accounts for more than 80% of the entire mold processing. Reasonable design of the inserts of the mold core is conducive to obtaining the best processing efficiency, ensuring the processing accuracy, and prolonging the life of the mold. I have introduced the design method of the full inlay mold before. This mold uses the design method of the whole mold core. Due to the large size of the plastic part, the size of the front mold core is 439.87x299.87x95; the size of the rear mold core is 439.87x299.87x101.76; such a large mold core is usually difficult to be framed directly. The fine frame is designed as an oblique frame, as shown in Figure 4. It should be noted that the front and rear molds are based on the reference angle, the two sides adjacent to the reference angle are vertical sides, and the other two sides far away from the reference angle are hypotenuses. One side can also be designed as a hypotenuse as required. The same slope is also designed at the corresponding position of the mold core. The angle is generally 3゜ or 5゜.
The core-pulling of the three holes on the side of the plastic part is all fixed-mold core-pulling. There is no movable template for the fixed mold of this set of molds. The core-pulling uses an oil cylinder to pull the core. The cylinder is not locked by the shovel base. With such a structure, the cylinder core can only be used for small holes without locking. It is not suitable for core pulling occasions with large area and large lateral force.
The top and edge of the plastic part cannot be designed with gates. The gate is designed in one of the round holes at the top, and the glue is inserted latently around the hole at two points. The main runner is an inclined main runner. When designing export molds, the application of inclined runners must be confirmed by customers.
ABIS MOLD TECHNOLOGY CO.,LTD
Daisy Wang (Sales Engineering)
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E: daisy@abismold.com
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