We should know that when we process a certain product, we will have different requirements for the appearance of the product. Plain clothes will require the use of some molds to achieve their purpose. The so-called precision casting mold, in fact, when we need to obtain the structural shape of a certain part, other materials that are easier to handle are made into the same shape in advance, and then put into the mold in the sand mold, so we get a cavity that is consistent with its shape. If we put the required material liquid in it, after cooling, we can get the same parts.

In order to ensure the performance of the parts, we will have certain requirements for accuracy. This is not only related to the performance of the product, but also directly affects the economic problems of the production process. Therefore, in order to ensure the precision size of the precision casting mold, we must ensure the performance of the parts under the premise, combined with other relevant factors, and finally determine the specific treatment.

For the production of precision casting molds, we must meet some requirements, the specific content is:
1. Determine the shape accuracy of parts in advance;
2. Surface roughness of parts;
3. The position accuracy between the surfaces of the parts;
4. Dimensional accuracy of parts processing;
5. Hardness of parts;
6, the specific requirements of heat treatment;
Consider other special requirements.

The squeeze casting mold structure has a total of 21 working parts and 8 specifications of couplings. The mold cost is low, the structure is simple, the action is flexible and reliable, and the production practice proves that it can meet the design requirements. Some structures of the mold can also be unique, such as unloading mechanism and pressure chamber and pressure sleeve structure. Since the hydraulic press for the production of the clamp handle has no discharge device, in order to facilitate production, it is necessary to design the discharge mechanism on the mold. The mold is fixed on the fixed mold base plate with four pull rods, which pass through the movable mold sleeve plate and the movable mold pressure plate and are connected with the discharge plate, and the discharge action can be realized after the mold is opened. In addition, six discharge rods are used to act on the movable insert and the overflow groove respectively to ensure that there is no top mark on the workpiece.

In order to reduce the weight of the mold and increase the effective height, five pressure columns are used to connect the movable mold base plate and the movable mold plate together with screws, and two movable small core blocks engraved with factory logo and characters are designed on the movable and fixed modules respectively, so as to facilitate manufacturing and maintenance. At the same time, round nuts are used to fix the pressing sleeve on the fixed die sleeve plate and the fixed die base plate. The length of the pressing sleeve is less than the total thickness of the fixed die sleeve plate and the base plate, so that the bottom plane of the fixed die base plate is flat, which is convenient for mold installation and storage. In order to make the distance of the alloy liquid entering the cavity short, it is processed into two planes at the pressure sleeve sprue, which are closely matched with the side of the fixed module after assembly. In order to make the remaining material smoothly leave the pressure chamber during mold opening, a slope of 2b is processed at a depth of 30mm from the top of the pressure sleeve.

The working principle of the mold is to pour alloy liquid into a pressure chamber composed of a pressure sleeve and a pressure head. The movable die seat plate connected to the movable beam of the press drives the movable die plate and the movable die sleeve plate to press against the fixed die sleeve plate to complete die clamping. The ejector rod and the pressure head connected to the piston of the lower cylinder of the press move upward to push the alloy liquid to fill the cavity, and the alloy liquid completes crystallization and solidification under higher pressure. After sufficient pressure, the press drives the movable die plate, the die base plate and the movable die sleeve plate to relieve the pressure and return. The extruded parts stay in the movable module and drive the push rod, the discharge plate and the pull rod to move upward together due to the effect of the wrapping force. After the pull rod moves for a certain distance, it is blocked by the fixed die sleeve plate. At this time, the movable die sleeve plate, the movable module and the movable die plate can continue to move, and push the push the parts out; take out the part, re-place the two movable blocks and the core, return the indenter, and then spray the paint to carry out the next working cycle.