What Is an Injection Mold Slide?

The so-called slider is a mold component that can slide perpendicular to the opening and closing direction or at a certain angle with the opening and closing direction during the opening and closing action of the mold. When the product structure makes the mold unable to demould normally without sliding block, the sliding block must be used.

The slider moves backward with the die opening, and the inclined guide column drives the slider. When closing the mold, the inclined guide column drives the slider to move forward.

The slider is an important part of the side core pulling in the injection mold. It is mainly connected with the molding core and driven by the inclined guide column. Generally, it is combined with the lateral core to form a side slider core, which is called combined side slider. When the side core is simple and easy to process, the side slider and the side core can also be made into one, which is called the integral side slider. "

Some problems of slide block of injection mold

In the injection mold, the slider plays the role of pushing the product out of the mold surface. What kind of steel is used? Is it related to the steel of the mold itself? In addition, what is the heat treatment? So what is the clearance requirement of the slider when it is installed into the die frame?

1. The slider can push out the product in the mold, as if there is no. a. Inclined pin and top block have ejection function; b. There are thimbles and diagonal pins on the slider. I don't know what kind of question you want to ask.

2. Generally, the material of injection mold slider does not need heat treatment; However, the inclined pin is subject to heat treatment. Generally, the hardness of SKD61 after heat treatment is 48 ° - 52 ° Rockwell hardness

3. The sliding block is a sliding fit with a unilateral clearance of 0.01-0.015mm

The sliding block is best quenched with quenching materials, such as CrWMn, Cr12MoV, etc. The heat treatment temperature is generally hrc45-60. When installing the mold frame, there must be a certain gap so that it can slide.

The material of the slider is generally better than that of other materials. We use 718 quenched here. Select two surfaces that are forced to slide in different directions, and leave a gap of one wire. The gap of 0.5 to 1 of other contact surfaces will not be affected

Summary of key points of injection mold design for oblique elastic slider of front mold

The oblique elastic slider of the front die is also called the explosive slider of the mother die. Generally, it is formed on the side of the master mold, and the plastic part has a large forming area on the slider, especially when the slider is used when the side of the master mold is very deep. The advantage of the oblique elastic slider of the front mold is that it occupies a small mold area. After the mold is opened, the slider core pulling mechanism is in the front mold, which does not affect the demoulding of the driven mold of the plastic part, and is conducive to the realization of full-automatic injection molding. These advantages of the front die inclined elastic slider make it widely used in shell parts such as forming turnover box, large container and so on. The design points of the front die oblique elastic slider include the following contents: key points of die manufacturing and assembly, slider positioning and guiding mechanism, die opening mechanism, driving force source, limit mechanism, etc.

Most of the driving force of the oblique elastic slider of the front die is driven by the spring. As shown in Figure 1, the spring 1 drives the slider, and the hook 8 overcomes the static friction at the moment of die opening to assist in die opening. For the slider with wider size, generally, each slider needs to add two springs. The spring driven front die oblique elastic slider is only suitable for small and medium-sized dies. For large molds, such as large turnover box molds and automobile glove box shell molds, if the front mold oblique elastic slider is driven by spring force, it appears that the force is insufficient. Therefore, for large molds, it is mostly driven by oil cylinder or nitrogen spring. The oblique elastic slider mechanism of the front die driven by the oil cylinder is shown in Figure 2. When the front die oblique elastic slider is driven by oil cylinder or nitrogen spring, the pull hook is generally not required.

The oblique elastic slider of the front die is usually positioned by the top insert, as shown in Figure 1. The left and right sliders are positioned by the top insert. Screw 5 is a process screw, which is easy to tighten the mold during mold installation and needs to be removed during normal operation.

Figure 3 shows the elastic hook of the large front die inclined elastic slider. The elastic hook has less wear and runs smoothly.

Figure 4 shows the two-way draw hook of the oblique elastic slider of the front die, which is mainly used when the position is small and the strength of the draw hook designed separately is insufficient.

The ejection stroke of the oblique elastic slider of the front die shall not exceed 2 / 3 of its height, and at least 1 / 3 shall be left in the a plate, so that the die can run smoothly. There are two methods to limit the travel. The first is to limit the travel by using the spring guide rod, as shown in screw 3 in Figure 1 The second method is to design the limit block at the place where the a plate is close to the parting surface. Generally, there are two T-shaped guide grooves on the back of each slide block. The first design method is to use the T-shaped guide groove on the back of each slide block. See Figure 5. The second is the end face guidance method, as shown in Figure 6. This kind of guiding method is often used when the cavity size of the slider is large and the strength of the slider will be weakened by making a guiding groove on the inclined plane.

There are many design schemes of oblique elastic slider of front die. Which design scheme to adopt needs specific analysis of specific problems.