Design points: can extend but not stretch, can stretch but not connect, can be flat but not beveled, can be beveled but not curved
(1) Shrinkage: All products are shrunk and aligned, such as placing multiple products on different layers to facilitate subsequent design
(2) Front and rear mold parting: If surface connecting product and parting is more flat, use solid parting, and if there are more curved surfaces, use curved parting
(3) Mechanism parting: Use solid to make shape, then calculate difference, make surfaces in complex positions to cut off excess parts, and fill in position that does not match product with solid. Mechanism parting is large first and then small, each one must be checked after completion
(4) Processing of same or similar mechanism: For same mechanism, you can first make a complete one, including all details of difference chamfer, then create a prosthesis and copy it; similar ones can be operated in this way, and some modifications can be made to different positions

 

Design points: large first, small later, and make use of every opportunity
(1) Cavity layout: After all products are parted, they are ranked one by one, large first, small later, and slider should be avoided as much as possible; for round products or symmetrical products, center position should be an integer for easy processing; ranking distance should take into account design of waterways, screws, gates, etc., especially horns and diving injection, and product spacing should be relatively Big
(2) Gate and runner design: Gate needs to be considered in arrangement. In order to avoid insufficient space, we need to design gate and runner well
(3) Mold core size adjustment: After arrangement, mold core peripheral size is adjusted. It must be an integer. Mold core peripheral distance from product should consider water channel and screw arrangement

 

 

Design points: First big and then small, from inside to outside, one step in place
(1) Slider seat: Under premise of meeting product requirements, width and height should be as small as possible. If slider is large, water transportation should be considered
(2) Inclined guide column: Angle of export mold should not exceed 15 degrees, and domestic mold should not exceed 25 degrees. Angle can be as small as possible; diameter should be as large as possible
(3) Wear block on the back: affects length of slider, so it should be designed first
(3) Spring: Spring will affect height of slider seat, so it should be designed first
(4) Shovel: Make back of shovel as thick as possible. Consider making a back shovel when slider is large or there are many glue positions
(5) Other accessories: pressure strips, bottom wear blocks, position buckles, limit blocks

 

Design points: Use standards if possible
(1) Adjust the mold base: Mold base is mainly selected based on slider and structure, and auxiliary parts that affect strength should also be considered, such as: squeeze block, positioning lock; fine gate mold frame also needs to consider tie rod and nylon plug. If there is a Lifter, ejection distance needs to be determined to determine height of square iron
(2) Select injection molding machine: first confirm whether length, width and height of mold meet requirements of injection molding machine, then confirm whether parameters of injection molding machine meet requirements
(3) Open inner mold and slider: After confirming that there is no problem with mold base, open inner mold and slider, and complete all details of slider. After all details of same slider are completed, build a dummy at opening position and copy it over to calculate difference
(4) Injection molding machine related: ejector hole, code mold position, nozzle, positioning ring
(5) Three-plate mold related: fine water channel, tie rod, buckle machine, nylon plug, etc. Tie rod stroke is greater than the total height of channel by 20-30mm. Nylon plug cannot be placed directly above mold core.

 

Design points: first large and then small, from inside to outside
(1) Lifter guide rod: Angle should not exceed 12 degrees, and it can be made as small as possible
(2) Lifter seat: Select seat type according to mold requirements, consider convenience of disassembly and assembly of mold
(3) Lifter guide block: Guide block thickness is 20, and screw cannot be too close to avoidance hole
(4) Same and similar lifter: After all details are done, frame position is opened, prosthesis is built and copied together to find difference

 

Design points: First ejector, then ejector
(1) Ejector: If BOSS column exceeds 10mm, consider using an ejector to eject it. Note that there should be no ejector hole directly below inner pin of ejector. After ejector is made, all differences can be calculated directly, in one step
(2) Ejector: First put product ejector and then runner ejector. Ejectors with a diameter of less than Ø3 need to be supported. Ejector does not require a difference first, and may need to be adjusted when draining water.

 

Design points: from inside to outside, first roughly and then optimize
(1) Inner mold waterway: Waterway is 1.5-2 times waterway diameter away from product, and 3-5 times waterway diameter between waterways
(2) Mold base water outlet: Water nozzle is generally made of countersunk head, and outlet cannot be blocked by Green column
(3) Other standard parts for water circuits: throat plugs, waterproof rings, water collection blocks, water nozzles

 

 

Design points: from inside to outside
(1) Inner mold related: inner mold screws, squeeze blocks
(2) AB plate parting surface related: side locks, counters, balance blocks, lock modules
(3) Ejection reset related: support head, limit block, reset spring, garbage nail, safety switch
(4) Other parts: mold feet, insulation board, dustproof board, etc.

 

Design points: from inside to outside
(1) Inner mold details: ejector water channel difference, parting surface avoidance of empty space, exhaust groove
(2) Mold base details: hanging mold teeth, code, prying mold groove, reference