A pair of molds is composed of an upper mold and a lower mold. The male die is a concave die, also known as the upper die. The design of the male mold is very important, and the structural characteristics of the female mold itself change with the structure of the product and the processing method of the mold, which is flexible.
What are the Male and Female Molds in the Mold Industry?
The mold is divided into the male mold and female mold according to the concave and convex. The mold is generally made of 2-3 parts. The concave half is called the female mold, and the protruding half is called the male mold. Both the punch and the die are used for forming. The die is generally a die base, which is placed under the product to be formed to avoid product movement. Move the weight and keep the strike force in the same direction as the mold centerline.
The role of punch and die is the main part of stamping processing. The punch and die are processed into the desired shape, and the sheet is to be processed on the punch. It is punched into the hole of the die through the punch, leaked, or ejected from the die. A required part is machined. The role of the punch and die is to play two roles, one is that the hole is used as a die, and the shape is used as a punch. The simplest part is a washer, which is punched out at one time. Corresponding to it is to have a punch and a concave.
What is the Master Template in the Mold?
There are two boards directly related to the part from which the product is formed. There are many common names for these two boards: A (female mold/cavity) board, and B (male mold/core) board. In general, the master template refers to the appearance of the molded product. The male template is inside the molded product.
What is the Difference Between Male and Female Molds?
Because most of the molds are divided into two parts, and the two pieces can fit together, there are male molds and female molds. The male mold and female mold in the mold are named according to the shape of the mold. The male mold is convex and the female mold is concave. The male and female are matched together to form a mold.
There is no fixed definition of public mold and female mold. Only the generally more fixed, concave mold is called the master mold. The one with larger activity and more protruding is called the male model. Such as punch simulation.
- Male model: Does not change with product changes.
- Master mold: It varies with the structure of the product and the processing method of the mold.
What are the Front and Rear Molds?
The length of the back mold ejector pin is the length of the product surface from the back mold ejector pin push plate to the ejector pin ejection product, and the length of the front mold nozzle is the front mold back plate.
What are the Processes of Plastic Molding Molds?
- Injection molding mold: The plastic is first heated and melted in the heating barrel of the injection molding machine, and then, driven by the screw or piston of the injection molding machine, enters the mold cavity through the nozzle and the pouring system of the mold, and finally hardens and shapes in the cavity. It is a simple process of injection molding, and the mold used in injection molding is called injection molding mold. Injection molds are used for the molding of thermoplastic products, but in recent years, they have been used more and more for the molding of thermoset plastics. Injection molding occupies a large proportion in the molding of plastic products, so about half of the production of plastic molding molds are injection molds.
- Extrusion molding die: The extrusion molding process allows the plastic in a viscous flow state to pass through a die with a specific cross-sectional shape under high temperature and high pressure. And then cool and shape at a lower temperature to produce a continuous flow with the desired cross-sectional shape. The molding method of profiles is called extrusion molding, and the mold used for plastic extrusion molding is extrusion molding die.
- Blow molding mold for hollow products: The blow molding process for hollow products is to put the extruded or injection-molded tubular blanks that are still in a plasticized state and put them into the molding cavity of the mold while they are still hot, and immediately introduce compressed air into the center of the blank. The tube blank is expanded and adhered to the cavity wall of the mold, and it becomes a hollow product after cooling and hardening. The mold used in this molding method is a blow molding mold for hollow products.
What is a Parting Line?
After the plastic injection is completed, the molded product must be taken out from the mold, but if the mold cannot be opened, it cannot be taken out, so a set of plastic molds must at least be divided into upper and lower or left and right molds. There will be a gap where they are separated or joined together because when the plastic is injected, it must be pressurized to fill the mold, so no matter how close the mold is, the plastic will be squeezed into this gap more or less, as an after the mold is taken out from the mold, a trace will be left on the gap, and this trace is called the parting line (PL) in the plastic industry, because it is usually a whole surface on the mold, so when a mold or a 3D drawing is drawn, it is often called a parting surface or a dividing surface.
Why do We Need to Consider the Draft Angle?
When the plastic is injected, in order to allow the plastic molded product to be easily taken out of the mold, it is usually necessary to give a certain draft angle to reduce the frictional force when the molded product is taken out from the mold. Also, because the demolding angle is necessary for plastic molded products, the demolding angle should be considered in the mold design stage, and the selection of the demolding angle and the reference point of the molding angle will directly affect the mold release angle. Due to the relative dimensions of the molded product, it is even more necessary to review the individual demolding angles item by item.
