1. Car parts mould slider design principle
The inclination angle of the slider is 2 to 3 degrees larger than the inclination angle of the oblique guide post, and the inclination angle of the oblique guide post should not exceed 20 degrees; the distance between the slider and the sealing surface of the front mold is greater than 15mm;; between the slider and the mold core The insert surface should be 3 degrees or 5 degrees to avoid direct friction with the mold core; it is best to keep the shovel body as it is, and ensure the strength in the form of insertion; the inclined surface and bottom of the slider should be made of wear-resistant blocks, and it can be considered not to make fast Mold; springs (or line buttons, or springs and line buttons used together) and limit devices should be added to the slider; when the rubber surface area on the slider is large, an excavator needs to be added; know how to calculate the slider Stroke; understand the material used in the grinding block guide; whether the fuel tank needs to be opened, and on which side it needs to be opened.
2. The design principle of car parts mould inclined roof
The matching length of the inclined top connecting rod and the guide sleeve should be greater than 2/3 of the length of the connecting rod in the B plate; the connection between the inclined top block and the connecting rod is better fixed by cup-head screws, which is convenient for processing; secondly, use a needle; in addition, It can be in the form of a block; the edge of the screw hole on the top block is at least 5mm away from the sealing position; the connecting rod and the B plate hole are 0.5mm away from the airside; the positioning of the connecting rod head and tail should be considered; the bottom plate should be hit Process holes, easy to disassemble and assemble; the designed oblique angle should be less than 12 degrees, not more than 15 degrees; know how to calculate the ejection stroke of the up and downslope tops; the inclined top seat is designed according to the simplest design, without any Claim.
3. Design principles of car parts mould straight top block
The matching length of the straight top connecting rod and the guide sleeve should be greater than 2/3 of the length of the connecting rod in the B plate; the connection between the straight top block and the connecting rod is best to be fixed with cup-head screws for easy processing; secondly, use a pin; in addition, It can be in the form of briquettes; the edge of the screw hole on the top block is at least 5mm away from the sealing position; the hole between the connecting rod and the B plate is 0.5mm; away from the open side; the positioning should consider the head and tail of the link; the bottom plate should be made into a process The connecting rod for easy disassembly and assembly can be directly fixed on the bottom needle plate; the side of the straight top block should be inclined 3 degrees or 5 degrees to avoid friction with the mold core when pushing in; the distance between the straight top block and the inner side of the plastic product should be It is 0.2 ~ 0.3 mm.
Four, car parts mould thimble, insert needle, sleeve, etc. layout principles
According to the characteristics of the product: the column depth is below 5mm, and the column depth is greater than 5mm, but it should also be based on the actual situation; deep bone parts need to be filled with venting inserts to avoid insufficient filling of bone trapped parts during injection molding; Below, a nozzle needle should be placed and turned upside down so that the nozzle can be pulled out of the runner after the mold is opened. According to the principle of product balance ejection, the ejector pins are arranged reasonably, the diameter of the ejector pins is as large as possible, and the smaller ejector pins are difficult to process;
Five, car parts mold water transport design principles
After arranging the ejector pin, bolt, inclined top, and pump nozzle, the water delivery hole must be arranged so as not to interfere with these components; according to the size of the mold, select the diameter of the water delivery hole, and control the good luck water hole and the water delivery hole The distance from the glue position; the water delivery hole is best to be vertical, and the processing of the inclined hole and the space corner hole is more difficult. The water conveying holes should be connected in series inside the mold as much as possible, not outside the mold; it is best to stagger the horizontal direction of the water outlet holes of the front and rear molds to promote the cooling effect.
Six, car parts mould supporting head layout principle
The support head cannot be placed too close to the square iron. It should be placed under the product, near the main injection port. The deformation force of the back mold is mainly the injection pressure of the injection molding machine. The distance between the support head and the thimble should be greater than 5 mm, the distance between the support head and the support head is about 80-120 mm, and the diameter of the support head should be 2 mm smaller than the original round rod material. It may be: 33, 38, 43, 48, 53, 58, 63, 68, 73... The support head is designed to be as large as possible, but there is no need to design a lot. Avoid hollowing out the thimble plate to avoid insufficient strength of the thimble plate. The layout of the support head should be about 25%-30% of the projected area of the thimble plate.