CN204673926U - Laddering pouring gate structure and injection mold - Google Patents

Abstract

The utility model discloses a kind of laddering pouring gate structure and injection mold, this laddering pouring gate structure comprises charging aperture, the runner be communicated with described charging aperture, and is communicated with the compound cast gate of described runner and mold cavity; Described compound cast gate comprises the fan gate with described flow passage, and the rectangle cast gate be communicated with mold cavity, and the expansion end of described fan gate is connected with described rectangle cast gate.This laddering pouring gate structure can reduce generation and the distortion of cast gate place of weld mark.

Description

Progressive gate structure and injection mold

technical field

The utility model relates to the technical field of molds, in particular to a progressive gate structure and an injection mold.

Background technique

When flat plastic products are injection molded, the temperature difference between the mold cavity and the core is too large, because the melt close to the surface of the cold mold cavity cools down quickly, while the material layer close to the surface of the hot mold cavity will continue to shrink. The unevenness will warp the plastic parts. This will affect the precision of plastic products and cause misalignment during assembly. Therefore, how to reduce the amount of warping and deformation of flat plastic products during injection molding is one of the important means to improve product precision. The gate is at the end of the gating system, which is the entrance for plastic to enter the mold cavity. The design of the gate is very important for the molding and internal stress of plastic products. The position, shape and size design of the gate have a great influence on the warping deformation of plastic products. big impact. Therefore, in the traditional injection mold design, multiple gates and fan gates are used for filling. This filling method can improve the distortion of plastic products after molding. However, the design of multiple gates is difficult, and weld marks will be generated after the product is formed, which will affect the product quality; when fan gates are used, the thickness of the gates will gradually become thinner, and the pressure drop and shear stress at the gate end will be large. Will cause deformation at the gate. As a result, the waste rate of traditional plastic products after injection molding is high and the loss is large; for flat plastic products with high precision requirements, traditionally designed molds cannot produce qualified products, which reduces the adaptability of enterprises to the market.

Contents of the invention

Based on this, in order to solve the problem that the unreasonable gate design in the above-mentioned traditional technology affects the injection molding quality of plastic products, the utility model provides a progressive gate structure and an injection mold.

Its technical scheme is as follows:

A progressive gate structure, comprising a feed port, a flow channel communicating with the feed port, and a compound gate communicating with the flow channel and a mold cavity; the compound gate includes a gate connected to the flow channel The fan gate communicates with the channel, and the rectangular gate communicates with the mold cavity, and the extended end of the fan gate is connected with the rectangular gate.

The progressive gate structure designs a new compound gate consisting of a fan gate and a rectangular gate. When the composite gate is used for melt filling, the pouring direction of the fan gate gradually becomes wider and the thickness becomes thinner. , The melt enters the cavity through a gradually expanding fan shape, so the melt can be distributed more evenly in the lateral direction, which can reduce the internal stress of the product and reduce deformation. Moreover, a rectangular gate is added to the tail side of the fan gate. This design method can improve the defects caused by the thinning of the fan gate, and make the melt enter the cavity more smoothly. This filling method can effectively reduce the gate Pressure drop at the gate and shear stress at the gate. This progressive gate structure can reduce weld line generation and gate deformation.

A technical solution is further described below:

Further, the runner includes a main channel, and a plurality of sub-runners connected with the main channel, each of the sub-runners communicates with one of the composite gates, and each of the composite gates is connected with a mold The cavity corresponds to the connection. It is designed in the form of multiple runners and multiple composite gates, which can pour multiple products at the same time and improve work efficiency.

Further, the feed inlet is arranged in the middle of the main channel, and the distance from each of the sub-runners to the corresponding composite gate is the same. When the melt is injected, the melt can flow uniformly and isochronously in each flow channel.

Further, it includes a main channel, and two runners symmetrically arranged at both ends of the main channel, and each of the two ends of the runners is connected with a composite gate. The flow channel, composite gate and mold cavity are symmetrically arranged to further improve efficiency, which is convenient and simple.

In addition, the utility model also provides an injection mold, which includes the above-mentioned progressive gate structure. Provide an injection mold with a progressive gate structure to improve the quality of injection molding products.

The utility model has the following beneficial effects:

1. The progressive gate filling method is adopted to reduce the amount of warping and deformation of plastic products during injection molding, thereby reducing the reject rate of products and improving economic benefits;

2. Reduce the pressure drop and shear stress of the gate section, and improve the deformation at the gate;

3. It overcomes the impact of repeated mold trial and mold repair on production, and greatly reduces the cost of mold manufacturing and maintenance;

4. It solves the practical problems caused by the production of flat plastic products, and has a wide range of applications.

Description of drawings

Fig. 1 is a structural schematic diagram of the progressive gate structure described in the embodiment of the present invention;

FIG. 2 is a partial structural schematic diagram of part A in FIG. 1 .

Explanation of reference numerals: 100-feeding port, 200-main runner, 300-runner, 400-composite gate, 410-fan gate, 420-rectangular gate, 500-mold cavity.

Detailed ways

Embodiments of the present utility model are described in detail below:

As shown in FIG. 1 , the utility model provides a progressive gate structure, including a feed port 100 , a flow channel connected to the feed port 100 , and a compound gate 400 connecting the flow channel and the mold cavity 500 . As shown in FIG. 2 , the composite gate 400 includes a fan gate 410 communicating with the runner, and a rectangular gate 420 communicating with the mold cavity 500 , and the extended end of the fan gate 410 is connected with the rectangular gate 420 .

The progressive gate structure designs a new composite gate 400 composed of a fan gate 410 and a rectangular gate 420. When the composite gate 400 is used for melt filling, the pouring direction of the fan gate 410 gradually changes. wide, the thickness becomes thinner, and the melt enters the cavity through a gradually expanding fan shape. Therefore, the melt can be distributed more evenly in the lateral direction, which can reduce the internal stress of the product and reduce deformation. Moreover, a rectangular gate 420 is added to the tail side of the fan gate 510. This design method can improve the defects caused by the thinning of the fan gate 410, and make the melt enter the cavity more smoothly, which can effectively reduce the gate The pressure drop at the gate and the shear stress at the gate. This progressive gate structure can reduce the generation of product weld lines and deformation at the gate.

Further, the runner of the above-mentioned progressive gate structure includes a main channel 200, and a plurality of sub-runners 300 communicating with the main channel 200, each sub-runner 300 communicates with a composite gate 400, and each composite gate 400 communicates with a mold cavity 500 correspondingly. It is designed in the form of multiple runners and multiple composite gates, which can pour multiple products at the same time and improve work efficiency. Furthermore, the feed inlet 100 is arranged in the middle of the main runner 200 , and the distance from each runner 300 to the corresponding composite gate 400 is the same. When the melt is injected, the melt can flow uniformly and isochronously in each flow channel. Specifically, the above-mentioned progressive gate structure may include a main channel 200 and two runners 300 symmetrically arranged at both ends of the main channel 200 , and composite gates 400 are connected to both ends of each runner 300 . The flow channel, composite gate and mold cavity are symmetrically arranged to further improve efficiency, which is convenient and simple.

In addition, the utility model also provides an injection mold, which includes the above-mentioned progressive gate structure. Injection molds with progressive gate structure are provided to improve the quality of injection molded products.

The utility model also provides a progressive gate structure, which breaks the traditional gate shape and adopts a new progressive composite gate combined with a fan gate and a rectangular gate. Through experiments, this progressive composite gate not only It can not only effectively improve the warpage and deformation of flat products, but also effectively improve the mechanical properties of flat plastic products after injection molding.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (5)

1. a laddering pouring gate structure, is characterized in that, comprises charging aperture, the runner be communicated with described charging aperture, and is communicated with the compound cast gate of described runner and mold cavity;

Described compound cast gate comprises the fan gate with described flow passage, and the rectangle cast gate be communicated with mold cavity, and the expansion end of described fan gate is connected with described rectangle cast gate.

2. laddering pouring gate structure according to claim 1, it is characterized in that, described runner comprises sprue, and the runner that multiple and described sprue is communicated with, each described runner is communicated with a described compound cast gate, and each described compound cast gate is corresponding with mold cavity is communicated with.

3. laddering pouring gate structure according to claim 2, is characterized in that, described charging aperture is arranged in the middle part of described sprue, and each described runner is identical to the distance of corresponding described compound cast gate.

4. laddering pouring gate structure according to claim 3, is characterized in that, comprises a sprue, and two runners being symmetricly set in described sprue two ends, and the two ends of each described runner are all connected with compound cast gate.

5. an injection mold, is characterized in that, comprises the laddering pouring gate structure as described in claim 1-4 any one.