Gel position check
Check the glue is even, if not even will cause shrinkage and affect the appearance.
Two. Determine the parting surface and taper angle
1 types of surface maximum projection in the opening direction, as simple as possible
2 touch to wear: as far as possible after the election, as to touch the mold, easy to take the front, the impact of the appearance, the use of plane contact.
3 pillow: Pillow 8 - 5 mm, and then with a large parting surface, plastic part pull 3 degrees, pull back 3 degrees or avoid empty.
4 insert wear: the use of side work, pull 3 degrees, generally do insert.
The three draft principles.
1: cut plastic draft direction.
2: axis of the largest end of the product size, the smallest hole type product size.
Four.2D mirror image
2D must pay attention to the mirror and shrink, such as to forget this step, the vast majority of die scrapped.
Five. Shrink
Small shrinkage products (below 5 per thousand) according to the experience on shrinkage, shrinkage of products, such as a 18 per thousand can also be placed 20 per thousand even can put 22 per thousand products, we must first seek the views of responsible person put, lest size matching products do not coincide with.
Six. KO should be coaxial with the eccentric sprue
Seven. Row position points
1 generally use inclined guide pillar for power, relatively small core pulling distance with T shaped groove, more than 30mm with the cylinder core pulling.
2 angle of the angle of the inclined guide pillar is smaller than the angle of the shovel machine 3 - 2 degrees.
The 3 line extends into the front mould die after a total of more than half of the height, you can dispense with the shovel machine, using the mold surface as the surface pressure.
4 row bit width is greater than 100mm, as far as possible with 2 oblique guide column, more than 150mm of the middle plus guide groove.
5 line positioning: as far as possible without Eric marbles (force big enough), with screw positioning.
The 6 line in the TOP position, must be put in line after the spring, or die due to gravity, not homing caused damage.
7 parting direction projection, such as a lifter or ejector row below, to set the pre reset mechanism, otherwise there may be in line with the lifter or thimble will produce interference.
The 8 line to walk, go to a beer, plastic bags, straight out.
9 line bit stroke should be greater than the deduction of 2 to 3mm, the cylinder stroke should be greater than the button 10mm.
10 in order to increase the firmness of the shovel, try to do the back shovel.
Eight. Key design points
1 inclined roof generally do 8 to 3 degrees, not more than 15.
2 out of the trip is generally greater than the deduction of 0.5 - 1mm.
3 out of the direction: the glue should be flat or upward, or to delay the top of the ramp.