Positive Mold

Flat extrusion die is a kind of manufacturing description for molds, and it is a professional word for metal forming and mold making.

The flat extrusion mode granulation device belongs to the die roll extrusion type granulation device. The utility model designs the die roller and the roller wheel into a cone, so that the linear speed of each point on the contact line between the die rollers is equal, and the roller wheel rolls on a plane without sliding, reducing resistance and prolonging the service life. In the die roller pair, the relative movement of the rollers along the template plane is achieved through the rotation of the template or the rotation of the bracket, and the material is squeezed between the die rollers, and the rotating rollers are forced to form through the die holes.

Flat-extrusion A granulating device for extruding materials including a template roller and a support, characterized in that the roller is composed of a cone roller or a cone roller and a cylindrical roller, and is combined with the template And the bracket of the sleeved roller forms a flat die cone roller pairing mechanism. Using the three-dimensional photoelastic stress freezing method, the three-dimensional stress field of the extrusion flat die was simulated and studied, and the distribution rules of the rectangular die and the T-shaped die σx, σy, and σz on the XY plane and along the height direction were obtained. At the same time, multiple regression statistical analysis was used. Method, the test results are fitted, and the stress field model is established, which provides a reference for the design of the extrusion die.

The mold is used in the forming process of punching, forming stamping, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, and compression molding or injection molding of engineering plastics, rubber, ceramics and other products to act on external forces. It is a tool for making the blank into a part with a specific shape and size.

The mold is generally divided into two parts: a movable mold and a fixed mold, or a convex mold and a concave mold, which can be separated or combined. The blank is loaded or the part is taken out when separating, and the part is separated or formed from the blank when closed. In the process of blanking, forming, stamping, die forging, cold heading, pressing and compression molding, the external force required for separation or forming is applied to the blank through the mold; in the process of extrusion, die-casting and injection molding, the external force is controlled by air pressure, column Plugs, punches, etc. are applied to the blank, and the die bears the expansion force of the blank. In addition to the mold itself, it also needs a mold base, a mold base, a guide device, and a product item ejection device. These components are generally made of general-purpose type to be suitable for a certain range of different molds. Designing the mold reasonably and properly designing the mold is an important part of prolonging its service life. The correctly designed mold structure should ensure that there is no possibility of impact cracking and stress concentration under normal conditions of use. Therefore, when designing the mold, try to make all parts of the force uniform, and pay attention to avoid sharp corners, concave corners, and wall thickness differences. Large disparity, flat wide and thin-walled cross-sections, etc., so as to avoid excessive stress concentration, causing heat treatment deformation, cracking, and brittle fracture or early thermal cracking during use. At the same time, standardized design is conducive to the exchange, storage and maintenance of molds. In general, reasonable mold structure design and reliable strength are more important, as well as continuous innovation of mold design theories and methods, and the use of computer-aided design is the main way to improve extrusion mold design and increase service life.