1. Differences in mold size:

 

Automotive mold manufacturing process

 

Automotive mold design process

 

Overall principles for automotive product parting
1. Extension, grid, and expansion are preferred for parting surfaces. Try to use stretching as little as possible, because stretching is point and line sealing, and parting surface is prone to flashing. Extending grid is surface sealing, parting surface is well matched and not easy to run.

 

How to quickly delete old curve when connecting curve?

 

Differences between bridge curves and art spline curves

 

Differences between G0, G1, G2, and G3 in bridge

 

Method 1 for patching regular interpenetration holes

 

Method 2 for patching regular interpenetration holes

 

Method for patching regular interpenetration holes

 

Bevel sealing size
When A≤25°, extend according to product surface,
For mold size within 1000mm, extension length is 15mm;
For mold size within 1000-1500mm, extension length is 30mm;
For mold size greater than 1500mm, extension length is 50mm.

 

Bevel sealing product optimization

 

Design of sun-textured product parting surface

 

General principles of layout

 

Standard Mold Base Strength Reference Dimensions
Automobile plastic parts are generally large, so molds are mainly medium and large, and processing technology of automobile injection molds is complex, general standard mold frames are difficult to meet requirements. Therefore, medium and large automobile mold frames are designed in a non-standard manner, and standard mold frames are generally used in small mold designs.

 

Selection of automobile mold guide pins

 

Generally, round guide pins are used for molds below 1000mm, and square guide pins are used for molds above 1000mm. For some structures where rear mold needs to be opened, square guide pins can also be added for guidance.

Automobile mold insert design principles
Original body refers to a mold core that is composed of a whole piece of steel. When mold core is composed of multiple parts, we call steel material other than main body an insert.

 

Introduction to lifter structure of automobile mold

 

Introduction to slide structure of automobile mold

 

General size requirements for ordinary slide design:
B=A+2°~3° (to prevent interference during mold closing and reduce friction during mold opening)
A≤25° (A is inclination angle of inclined guide column)
L=1.5D (L is matching length of inclined guide column)
S=T+2~3mm (S is slide stroke: T is product undercut stroke)
S=(L1xsina-ō)/cosA (ō is gap between inclined guide column and slide, generally 0.5MM, L1 is vertical distance of inclined guide column in slide)

Introduction to oblique draw structure parts

 

Features of automotive product casting system

 

Automobile products are generally integrated needle valve hot runners with timing control. Valve needle uses a cylinder to control the entire hot runner junction box, oil circuit connector, timing controller fixed in one piece for easy disassembly and assembly.

Summary of pouring system design
Curved channel design: Applicable to PC transparent materials. Curved channel can reduce flow marks caused by plastic filling.

 

Anti-drawing nozzle is to process a slit in the middle of ordinary nozzle, and embed a 1mm thick thin steel sheet in slit (thin steel sheet material is quenched to HRC58-60 with 0.1 class cold-working steel) to improve cooling effect at nozzle, thereby preventing drawing phenomenon at nozzle. This structure cannot be used for molding glass fiber-added rubber, and is commonly used for molding materials such as ABS.
Development of hot runner technology: As an advanced injection molding technology, hot runner technology, its popular use in European and American countries can be traced back to the middle of last century or even earlier. As early as December 1940, E.R. Knowles obtained patent for hot runner technology. Because hot runners have many advantages, they have developed rapidly abroad. Use of hot runners in molds abroad has reached 80-90%, while use of hot runners in domestic molds is about 30%. Use of hot runners in molds will become more and more common.
In recent years, gradual promotion of hot runner technology in China is largely due to rapid development of my country's mold exports to European and American companies. In Europe and United States, injection molding production has relied on hot runner technology. It can be said that molds that do not use hot runner technology are now difficult to export, which has also caused many mold manufacturers to change their awareness of hot runner technology.

Introduction to hot runners for automobile molds
Development of hot runner technology: As an advanced injection molding processing technology, hot runner technology has been widely used in Europe and United States since middle of last century or even earlier. As early as December 1940, E.R. Knowles obtained patent for hot runner technology. Since hot runners have many advantages, they have developed rapidly abroad. Use of hot runners in molds abroad has reached 80~90%, while use of hot runners in domestic molds is about 30%. Use of mold hot runners will become more and more common.
In recent years, gradual promotion of hot runner technology in China is largely due to rapid development of my country's mold exports to European and American companies. In Europe and United States, injection molding production has relied on hot runner technology. It can be said that molds that do not use hot runner technology are now difficult to export, which has also caused many mold manufacturers to change their awareness of hot runner technology.

 

Application of in-mold hot cutting technology

 

Principles of automotive mold ejector design
Importance of mold ejector mechanism design: Whether a product can be ejected smoothly determines success or failure of mold development. Therefore, in mold design process, ejector mechanism design is particularly challenging. When ejector mechanism interferes with cooling system, principle of ensuring that ejector system is 0K is given priority.

 

Introduction to Automobile Mold Cooling System
Mold cooling accounts for a large proportion of the entire mold molding cycle, up to 80% of the entire cycle, so it is necessary to optimize mold cooling structure and reduce cooling cycle.

 

Setting up a cooling system in mold is an effective measure to control mold temperature. In order to shorten cycle, it is always hoped that mold temperature is lower, but if mold temperature is too low, plastic parts will have problems such as material flow marks, weld lines (or loose connections), poor strength or serious material shortages. If mold temperature is too high, although melt has good fluidity, product surface roughness is small, and mechanical properties are good, molding cycle is long and post-shrinkage deformation is large. Therefore, mold should maintain a certain mold temperature, which must be adjusted by mold heating and cooling system.