Lifter design
1. Lifter is generally 3-8°, not exceeding 15°
2. Ejection stroke is generally 0.5-1mm greater than buckle position.
3. Ejection direction: Glue position should be flat or upward, otherwise delayed ejector is required. When width of ejector is relatively small, a frame is added to ejector plate to shorten height of ejector to ensure strength.

 

Glue position check
Check whether glue position is uniform. If it is not uniform, it will cause shrinkage and affect appearance.
Mold opening direction
Determine parting surface and draft angle
1. Parting surface selects maximum value of projection in mold opening direction, and it is as simple as possible.
2. Touch-through position: Try to touch rear mold. If you want to touch front mold, it is easy to break and affect appearance. Use flat contact.
3. Pillow position: Pillow 5-8 mm, then level with large parting surface, pull 3 degrees in glue position, pull 3 degrees in the back or avoid air
4. Insertion position: Use side work, pull 3 degrees, generally for inserts.
Principles of demolding
1: demolding in direction of glue reduction
2: maximum end of shaft is product size, and minimum end of hole is product size.
2D mirroring
2D must pay attention to mirroring and shrinkage. If you forget this step, most molds will be scrapped.
Shrinkage calculation
Products with small shrinkage rates (less than 5‰) can be shrunk according to experience. Products with large shrinkage rates, such as a product that can be 18‰, 20‰, or even 22‰, must first seek opinions of person in charge before placing them, so as to avoid inconsistency with size of supporting products.
Key points for checking mold drawing
1. Generally, inclined guide pillars are used as power, T-slots are used for relatively small core pulling distances, and cylinder core pulling is used for core pulling greater than 30mm.
2. Angle of inclined guide pillar is 2-3 degrees smaller than angle of shovel machine:
3. If rear mold slide position extends into front mold for more than half of the total height, shovel machine can be omitted, and front mold processing surface can be used as pressing surface
4. If slide position width is greater than 100mm, try to use 2 inclined guide pillars, and add guide grooves in the middle for slide position greater than 150mm
5. Slide position positioning: Try not to use marbles (not enough force), and use screws for positioning.
6. When slide position is in TOP position, a spring must be placed, otherwise slide position will not be able to return to its original position due to gravity after mold is opened, resulting in damage.
7. Projection of mold opening direction, if there is a bevel or ejector under slide position, a reset mechanism should be set first, otherwise there may be interference between slide position and bevel or ejector pin.
8. Slide position and walking, beer handle, rubber position, straight body out
9. Slide position stroke should be 2 to 3mm greater than buckle position, and cylinder stroke should be 10mm greater than buckle position.
10. In order to increase firmness of shovel machine, try to do a backhoe
Coaxial calculation
Nozzle eccentricity KO should be coaxial