Plastic mold slanting top
[Use of Plastic mold slanting top]
The sloping top mechanism is generally used to form the internal or external barb of the product, and cannot be directly formed by the movable mold side slider, and also functions as a ejector product.
[General Structure and Category of Inclined Top]
The sloping roof is generally composed of two parts: a body part and a forming part. Like the slider, because the body part and the forming part are combined, the sloping top can be classified into: an integral slanting top (also called a non-combined slanting top) and a non-integrated slanting top (also called a combined slanting top). . Note that since the sloping roof is relatively small, we generally use a monolithic sloping roof and rarely use a combined slanting roof. The integral inclined roof has a compact structure, good strength and no damage. For larger inclined tops, the combination can be used in design, which is convenient to replace, easy to maintain and maintain, and the processing is relatively simple.
In addition, due to the different positioning structure of the bottom end of the inclined top body, the inclined top can be further classified into a cylindrical pin type inclined top and a T type block type inclined top. For these two kinds of inclined tops, the cylindrical pin type inclined top is used in many designs. The main reason is that it is easy to process, easy to install and maintain. The T-type slanting top is mainly used for products with higher precision requirements. It also needs to be matched with a special T-shaped base. The machining cooperation is difficult and the manufacturing cost is also increased.
[The principle of motion of the inclined roof]
The slanted top is placed in a slanted hole of a fixed template, and the slanted top cooperates with the slanted hole. From the bottom to the top, a thrust pushes the slanting roof upwards for a certain distance. It is found that under the forcing action of the inclined hole and the thrust, the inclined roof not only moves upward, but also moves to a certain distance in the oblique direction of the inclined top. During the ejection process, since the product is a vertical line motion, the oblique roof not only moves in a vertical line, but also moves in the opposite direction to the dead angle, so that the dead angle can be handled.
[Design of Plastic mold slanting top]
Prerequisites: The dimensions of the plastic template, plastic mold core, and plastic mold base have been determined.
(1) View the drawings, carefully analyze and determine the size of the dead angle
2) Determine the starting point of 0° on the broken surface and determine its length. If you do not design a 0° break, select point A as the starting point for the slope.
(3) Based on point B, the distance is one point, as shown in Figure BC, BC = the top stroke.
(4) Taking the point C as a reference, the distance in the opposite direction of the oblique top is shifted by one distance. CD = oblique top stroke (take integer) = dead angle size + minimum safety amount greater than or equal to 3mm.
(5) Connect the DB to get the angle DBC. This angle is generally a decimal. We take an integer for M°. This angle is the angle of inclination of the inclined top slope we need.
(6) Other contents can be designed according to the structure and the requirements mentioned above.
In fact, the main purpose of the content as complex as above is to teach us how to find the tilt angle of the oblique top.
[Slanting top design points]
(1) Determine the angle of the inclined roof according to the actual stroke H, generally 3~12°, the slope should be as small as possible; the core distance of the inclined top is generally larger than the product core distance 3mm; the strength of the inclined roof, the slope of the inclined roof and Coordinate with the ejector distance;
(2) determining the width of the inclined roof according to the width of the product buckle;
(3) According to the width of the inclined top and the position of the product where the inclined top is located (mainly whether there is interference or whether the gap of the glue surface on the inclined top is large), the thickness of the inclined roof is determined, generally not less than 6.0;
(4) Determine the form of the guide groove according to the difficulty, thickness and total length of the inclined roof. The guide groove is generally made of 40Cr material;
(5) Design the guide slider according to the size of the inclined roof; the material generally has 40Cr and bronze;
(6) The slanting top material is uniformly treated with H13 and nitriding;
(7) The oil tank should be processed at the inclined top (except for the top and bottom of the inclined roof);
(8) Pay attention to the direction of the finished product, avoid hanging the inclined roof, and increase the acceleration top if necessary;
(9) When drawing, the oblique top should be expressed in three views;
(10) The top surface of the inclined top is 0.05mm below the product surface to avoid straining the surface;
(11) It is necessary to consider whether the product will stick to the slanting top and whether it is positioned to pull the product;
(12) To check whether the head of the inclined top is reversed (the ejector will be shovel), it should be noted whether the inclined top will interfere with other components (such as other inclined tops, thimbles, bones), and must be checked;
(13) When the product is very deep and there is a slanted top on the side, the inclined top should be positioned with a step. There is also a case where the slanted top is on the side of the product (the product has a certain depth), and the slanting top has a deeper side. Bone position.
These are plastic mold slanting top.