Shenzhen Ligong Technology Co., Ltd.
Contact: Mr。 Ma
Mobile: 13544053951 or 18938783300
Address: Home 33rd,Xinsha Road ,Shanxia Community,Pinghu Street,Longgang District,Shenzhen City
Ligong mold drilling machine to tell you "mold thimble use principle":
Thimble A. thimble placement principle
(1) thimble arrangement should make the top force as much as possible balance。 The structure of complex parts required stripping force is greater, the corresponding number of thimble should be increased。
(2) thimble should be set in the effective parts, such as bone, column, step, metal inserts, local thick plastic and other complex parts。 Bone position, the column on both sides of the thimble should be symmetrical layout, thimble and bone position, the column spacing of the general take D = 1。5mm In addition, should try to ensure that the column on both sides of the center of the thimble through the center of the column。
(3) to avoid cross-step or set in the slope of the thimble, thimble top should be gentle, thimble should be placed in the plastic parts of the better structural parts。
(4) A flattened thimble should be used when the deep bone bit (depth ≥20mm) or difficult to arrange the dome needle. Need to use the flat thimble, the flat thimble as far as possible in the form of inserts in order to facilitate processing. The following are the same as the "
(5) to avoid sharp steel, thin steel, especially the top of the thimble can not touch the front face。
(6) thimble arrangement should consider the thimble and the side of the waterway spacing, to avoid affecting the processing and leakage of the waterway。
(7) To consider the exhaust function of the thimble, in order to eject the exhaust, in the easy to form a vacuum should be arranged thimble。 For example, the cavity of the larger plane, although the plastic package less compact, but easy to form a vacuum, resulting in increased stripping force。
(8) the appearance of the requirements of the plastic pieces, thimble can not be arranged on the appearance of the surface, should be used other top method.
(9) For transparent plastic parts, thimble can not be arranged in the need to light the site。
B。 Thimble selection principle
(1) the choice of larger diameter thimble. That is, in the case of a sufficient ejection position, should use a larger diameter, and size priority thimble.
(2) the choice of thimble should be as little as possible specifications。 When using a thimble, adjust the size of the thimble so that the size of the smallest, and try to use the preferred size series。
(3) the choice of thimble should meet the requirements of the top strength。 When the top ejector, the thimble to withstand greater pressure, in order to avoid the small thimble bending deformation, when the thimble diameter is less than 2。5mm, should be used with a thimble。
Line position, ramp top
Plastic side wall with concave and convex shape, side hole and buckle, the mold mold out of the plastic pieces before the need to be drawn out of the lateral core, this body called the position。 Plastic outside the hole, need to post-mold line core。 Plastic inside the groove, if the top of the mold with the top, the top of the distance is not enough to be used within the bit。
In addition, the use of oblique top out, erection and core pulling at the same time to complete the top of the body called the roof. On the plastic parts need to pull the core of the site, when the line space is not enough, you can use the sloping roof mechanism to complete. In the inclined roof mechanism, the oblique ejection distance should be greater than the core pulling distance (B> H), to prevent the top of the interference.
Plastic parts, the outer side of the wall are concave, the inside of the skeleton obstruction and the height is not enough reason to be on the lateral wall before the mold line, the medial wall of the top of the slope of the mold。
Plastic side of the hole can not be around the hole, the side hole to be before the mold line core pulling, buckle slanting top die.