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Automotive Mold System Design Standards

Feb 08-2021     Views: 350


Ⅰ. The design of automotive mould die slider


1. The slope angle of the slider is 2 to 3 degrees larger than the angle of the inclined guide post, and the angle of the inclined guide post should not exceed 20 degrees;


2. The distance between the sliding block and the sealing surface of the front mold is greater than 15mm;


3. The insertion surface of the slider and the mold core should be made 3 degrees or 5 degrees to avoid direct friction with the mold core;


4. The shovel machine can be the best to stay in the original body, and the insert form must ensure the strength;


5. The oblique side and bottom surface of the slider need to be made of wear-resistant blocks, and fast molds may not be considered;


6. The slider needs to add a spring (or a buckle, or a spring and a buckle together) and a limit device;


7. When the area of the glue plane on the slider is large, a backhoe is needed;


8. Understand how to calculate the stroke of the lower slider;


9. Understand the material used for the wear-resistant block guide; whether it is necessary to open the oil groove and which side it is on. You will know more about automotive moulding.


Ⅱ. Design of inclined roof of automobile mould


1. The mating length of the inclined top link and the guide sleeve must be greater than 2/3 of the length of the link in the B plate;


2. It is better to fix the inclined top block and the connecting rod with cup-head screws, which is convenient for processing; secondly, use pins; thirdly, it can be in the form of pressing blocks;


3. The edge of the screw hole on the top block is at least 5mm away from the sealing position;


4. The hole between the connecting rod and the B plate is 0.5mm on one side;


5. The head and tail of the link should be considered for positioning; the bottom plate should be made with craft holes for easy disassembly and assembly;


6. The angle of the inclined top ejector should be below 12 degrees, not more than 15 degrees;


7. Understand how to calculate the ejection stroke of the up and down slope;


8. The simplest design of the inclined top seat is not required.


Ⅲ. Straight top design of automobile mould


1. The mating length of the straight top link and the guide sleeve must be greater than 2/3 of the length of the link in the B plate;


2. It is better to fix the straight top block and the connecting rod with cup-head screws, which is convenient for processing; secondly, use pins; thirdly, it can be in the form of pressing blocks;


3. The edge of the screw hole on the top block is at least 5mm away from the sealing position;


4. The hole between the connecting rod and the B plate is 0.5mm on one side;


5. The head and tail of the link should be considered for positioning; the bottom plate should be made with craft holes for easy disassembly and assembly;


6. The link can be directly fixed on the bottom needle plate;


7. The side of the straight top block needs to be inclined at 3 or 5 degrees to avoid friction with the mold core during ejection;


8. The distance between the straight top block and the inner side of the plastic product should be 0.2~0.3mm.


Ⅳ. The thimble design of automotive mould


1. According to the product characteristics: the depth of the column is less than 5mm for inserting needles, and the pillars greater than 5mm are used for cylinders, but also according to the actual situation;


2. Deeper bones need to be made of inserts for venting to avoid dissatisfaction of the filling of trapped bones during injection molding;


3. A nozzle needle needs to be placed directly under the main runner and has an inverted buckle feature to pull the nozzle out of the runner after the mold is opened;


4. According to the principle of product balance ejection, the thimble should be arranged reasonably, and the diameter of the thimble should be as large as possible. It is more difficult to process smaller thimble.


Ⅴ. Water transportation design of automobile mold


1. After arranging thimble, inserting needle, inclined top, and nozzle, arrange the water transportation hole to avoid interference with these components;


2. Choose the diameter of the water transport hole according to the size of the auto mold, and control the distance between the good luck water holes and the distance between the water transport hole and the glue position;


3. It is best to make the water transportation holes vertical, and it is difficult to process oblique holes and spatial angle holes;


4. Try to connect the water-carrying holes in series inside the mold, not outside the mold;


5. It is best to stagger the horizontal direction of the water conveying holes of the front and rear molds to facilitate the cooling effect.


Ⅵ. Design of Auto Mould Support


1. The support head should not be placed too close to the square iron. It should be placed below the product and near the main plastic inlet. The deformation force of the rear mold is mainly the injection pressure of the injection molding machine;


2. The distance between the support head and the thimble should be more than 5mm, and the distance between the support head and the support head is about 80-120mm.


3. The diameter of the support head is designed to be 2mm smaller than the unprocessed round bar; it can be designed as: ¢33, ¢38, ¢43, ¢48, ¢53, ¢58, ¢63, ¢68, ¢73, ……


4. When designing the support head, try to be as large as possible, but it is not necessary to design a lot. Avoid hollowing out the thimble plate to avoid insufficient strength of the thimble plate.


5. The layout of the support head should be about 25%-30% of the projected area of the thimble plate.

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