CN209666179U - An injection mold for demoulding of internal thread - Google Patents

Abstract

The utility model belongs to mould applications, provide a kind of injection mold for internal screw thread demoulding, it include: solid plate, it is offered into cast gate and several type chambers, each type chamber is uniformly surrounded on into cast gate peripheral region, cast gate lower end is provided with several gate channels, each gate channel is angularly disposed and its end is located at corresponding cavity side end, and each gate channel is communicated with corresponding type chamber；Moving template is movably set in solid plate lower end, several double wedges is provided on moving template upper surface；De- material component is formed, the upper end is provided with several rotation columns, and the activity of each rotation column is through moving template and the upper end stretches to that corresponding type is intracavitary, and each rotation column upper end is provided with screw thread corresponding with product；Product is enabled to detach rotation column when the rotation of rotation column.Compared with prior art, the utility model has the advantage of the material-removing structures that can be reduced in solid plate, reduce the manufacturing cost of solid plate.

Description

An injection mold for demoulding of internal thread

technical field

The utility model belongs to the field of moulds, in particular to an injection mold used for internal thread demoulding.

Background technique

Injection molds are fixtures used for rapid prototyping of plastic products. The injection mold consists of a moving mold and a fixed mold. The moving mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form the gating system and the cavity, and the movable mold and the fixed mold are separated to take out the plastic product when the mold is opened. The mold is mainly composed of pouring system, temperature adjustment system, molding parts and structural parts. Among them, the pouring system and molding parts are the parts that are in direct contact with the plastic and change with the plastic and the product. They are the most complex and the most changing parts in the mold, requiring the highest processing finish and precision. The gating system refers to the part of the runner before the plastic enters the cavity from the nozzle, including the main runner, cold material cavity, runner and gate. Molded parts refer to various parts that make up the shape of the product, including moving molds, fixed molds and cavities, cores, molding rods, and exhaust ports.

The demoulding of the threaded part of the plastic part is the key to the design of the mold with internal and external threads. Generally, the following two methods are used for demoulding: one is to use forced demoulding when the plastic parts and structure allow it; the other is not suitable for forced demoulding, such as deep threads, Plastic parts with high strength and high thread precision requirements must be demoulded by rotary demoulding. With the existing rotary demoulding structure, after the product is injected, it is troublesome to separate the product from the sprue. Adding a stripping structure to the fixed template will greatly increase the manufacturing cost of the mold and the processing difficulty of the casting, so it is necessary to design a new injection mold that is easy to demould.

Utility model content

The technical problem to be solved by the utility model is to provide an injection mold for demoulding of internal threads aiming at the current state of the prior art.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is as follows: a kind of injection mold for internal thread demoulding is proposed, including: a fixed template, which is provided with a gate and a plurality of cavities, each of the cavities Uniformly surrounding the periphery of the gate, the lower end of the gate is provided with several gate channels, each gate channel is arranged obliquely and its end is located at the corresponding side end of the cavity , each gate channel communicates with the corresponding cavity;

A movable template, which is movably arranged at the lower end of the fixed template, and a plurality of protruding teeth are arranged on the upper end surface of the movable template;

Forming stripper assembly, the upper end of which is provided with a number of rotating columns, each of which is movable through the movable template and whose upper end extends into the corresponding cavity, and the upper end of each rotating column is It is provided with threads corresponding to the product;

When the rotating column is rotated, the product can be disengaged from the rotating column.

In the above-mentioned injection mold for internal thread demoulding, the molding stripping assembly includes:

a moving plate, which is movably connected to the lower end of the moving template, and each of the rotating columns is movably inserted on the moving plate;

The rotating main shaft is movably inserted on the moving plate, and the lower end of each rotating column is meshed with the upper end of the rotating main shaft;

A rotating motor is arranged at the side end of the moving plate and its lower end is connected with the rotating main shaft.

In the above-mentioned injection mold for internal thread demoulding, the lower end of the fixed plate is provided with a plurality of first connecting columns, and each of the first connecting columns is sleeved with a first stripping spring. The lower ends of each of the first stripping springs are against the upper end of the movable template.

In the above-mentioned injection mold for internal thread demoulding, several second connecting columns are inserted on the movable template, and each of the second connecting columns is sleeved with a second stripping spring, The lower end of each second stripping spring abuts against the upper end of the moving plate.

In the above-mentioned injection mold for internal thread demoulding, the lower end of the fixed template is provided with a guide sleeve, the movable plate is provided with a guide post, and the upper end of the guide post passes through the movable template and is movably inserted. in the guide sleeve.

Compared with the prior art, the utility model has the advantage that the injection mold for internal thread demoulding can automatically drive the product to be separated from the sprue when the mold is opened, reducing the stripping structure in the fixed formwork and reducing the manufacturing cost of the fixed formwork , Reduce the production steps and production difficulty of the product.

Description of drawings

Fig. 1 is the perspective view of the main direction of the injection mold used for internal thread demoulding;

Fig. 2 is a side square perspective view of the injection mold used for internal thread demoulding;

Fig. 3 is a perspective view of the fixed template.

Fig. 4 is a diagram of the connection relationship between the movable template and the forming stripper assembly.

In the figure, the fixed template 1, the gate 2, the cavity 3, the gate channel 4, the movable template 5, the convex teeth 6, the rotating column 7, the moving plate 8, the rotating main shaft 9, the rotating motor 10, the first connecting column 11. The first stripping spring 12, the second connecting column 13, the second stripping spring 14, the guide sleeve 15, the guide column 16, and the product 17.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figures 1 to 4, the injection mold used for internal thread demoulding includes: a fixed template 1, which is provided with a gate 2 and several cavities 3, and each cavity 3 evenly surrounds the gate At the periphery of the gate 2, several gate channels 4 are arranged at the lower end of the gate 2, each gate channel 4 is arranged obliquely and its end is located at the side end of the corresponding cavity 3, each gate channel 4 is It communicates with the corresponding cavity 3; the movable platen 5 is movably arranged at the lower end of the fixed platen 1, and several protruding teeth 6 are arranged on the upper end surface of the movable platen 5; , each rotating column 7 is movable through the movable template 5 and its upper end extends into the corresponding cavity 3, and the upper end of each rotating column 7 is provided with a thread corresponding to the product 17; when the rotating column 7 rotates The product 17 can be disengaged from the rotating post 7 during this time.

During injection molding, the rotating column 7 is located in the cavity 3, and the injection molding raw material enters from the inlet gate 2, and then slowly flows into the gate channel 4. The end of the gate channel 4 is set obliquely upward, and the end of the gate channel 4 The part is located at the side end of the cavity 3 and communicates with the cavity 3, and then the injection molding raw material can enter the cavity 3 from the side of the cavity 3, which can reduce the speed of the injection molding raw material falling into the cavity 3, and avoid air bubbles inside the product 17. To improve the quality of the product 17, when the injection molding is completed and the product 17 is formed, the mold opening action can be started, that is, the movable template 5 is separated from the fixed template 1, and the upper end of the rotating column 7 is provided with a thread corresponding to the product 17, so the product 17 is formed Finally, it is threadedly connected with the upper end of the rotating type column 7. When the movable template 5 descends, it can drive the forming stripping assembly to move downward, that is, it can drive the product 17 to move downward, because the sprue is connected with the side end surface of the product 17. Together, when the product 17 moves downward, the fixed template 1 remains still, that is, the position of the sprue remains unchanged, and the product 17 is subjected to a downward force, that is, the product 17 can be disconnected from the sprue. The cutting structure is added to the fixed formwork 1 to reduce the manufacturing cost of the fixed formwork 1, and at the same time reduce the production steps and production difficulty of the product 17 and increase the output.

When the movable template 5 moves downwards and drives the product 17 to move out of the cavity 3, the forming stripping assembly can be separated from the movable template 5, that is, it can drive the rotary column 7 to move downward, because the product 17 is screwed to the rotary column 7, Therefore, the rotating column 7 can drive the product 17 to move downwards. When the product 17 moves down to a certain distance, the lower end of the product 17 can lean against the convex tooth 6. The teeth 6 can provide frictional force for the product 17 to ensure that the product 17 will not rotate to the rotating column 7, and then the rotating column 7 can be separated from the product 17 to complete demoulding.

The forming and stripping assembly includes: a moving plate 8, which is movably connected to the lower end of the moving template 5, and each rotating column 7 is movably inserted on the moving plate 8; a rotating main shaft 9, which is movably inserted on the moving plate 8, and each The lower ends of each rotating post 7 are meshed and connected with the upper end of the rotating main shaft 9;

The moving plate 8 can move up and down relative to the movable template 5, the lower end of the main shaft of the rotating shaft is connected with the rotating motor 10, and the rotating motor 10 can drive the rotating main shaft 9 to rotate, because the rotating post 7 is engaged with the rotating main shaft 9, so when the rotating motor 10 works It can drive the rotating column 7 to rotate. When the rotating column 7 moves, the moving plate 8 gradually moves away from the movable template 5, so that a downward force can be given to the product 17, so that the lower end of the product 17 is tightly against the convex tooth 6 Therefore, the rotary column 7 can be separated from the product 17 to realize the demoulding purpose.

The lower end of the fixed template 1 is provided with a plurality of first connecting columns 11, and each first connecting column 11 is provided with a first stripping spring 12, and the lower end of each first stripping spring 12 is against the upper end of the movable template 5 .

When the mold is opened, the fixed template 1 and the movable template 5 are no longer locked, and the first stripping spring 12 can drive the movable template 5 to be separated from the fixed template 1 automatically, thereby realizing the separation of the product 17 from the gate channel 4. The elastic force of the material spring 12 drives the movable template 5 to separate from the fixed template 1, thereby reducing the driving structure of the movable template 5 and reducing the mold manufacturing cost.

A plurality of second connecting columns 13 are inserted on the movable template 5, and each second connecting column 13 is provided with a second stripping spring 14, and the lower end of each second stripping spring 14 is against the moving plate 8 upper end.

The second stripping spring 14 can drive the movable plate 8 to separate from the movable template 5, because the rotary column 7 is arranged on the movable plate 8, when the movable plate 8 is separated from the movable template 5, it can drive the rotary column 7 relative to the movable template 5 moves downwards gradually, so that the lower end of the product 17 can be leaned against the protruding teeth 6 .

The lower end of the fixed template 1 is provided with a guide sleeve 15 , and the movable plate 8 is provided with a guide post 16 . The upper end of the guide post 16 runs through the movable template 5 and is movably inserted in the guide sleeve 15 .

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the scope defined by the spirit of the utility model.

Claims (5)

1. An injection mold for internal thread demoulding, characterized in that, comprising: A fixed formwork, which is provided with a gate and several cavities, each of which is evenly surrounded by the periphery of the gate, and a plurality of gate channels are provided at the lower end of the gate, and each of the cavities The gate channels are arranged obliquely and their ends are located at the corresponding side ends of the cavity, and each gate channel communicates with the corresponding cavity; A movable template, which is movably arranged at the lower end of the fixed template, and a plurality of protruding teeth are arranged on the upper end surface of the movable template; Forming stripper assembly, the upper end of which is provided with a number of rotating columns, each of which is movable through the movable template and whose upper end extends into the corresponding cavity, and the upper end of each rotating column is It is provided with threads corresponding to the product; When the rotating column is rotated, the product can be disengaged from the rotating column. 2. A kind of injection mold for internal thread stripping according to claim 1, characterized in that, the molding stripping assembly comprises: a moving plate, which is movably connected to the lower end of the moving template, and each of the rotating columns is movably inserted on the moving plate; The rotating main shaft is movably inserted on the moving plate, and the lower end of each rotating column is meshed with the upper end of the rotating main shaft; A rotating motor is arranged at the side end of the moving plate and its lower end is connected with the rotating main shaft. 3. A kind of injection mold for internal thread demoulding according to claim 2, characterized in that, the lower end of the fixed plate is provided with several first connecting columns, and each of the first connecting columns is covered with A first stripping spring is provided, and the lower end of each first stripping spring abuts against the upper end of the movable template. 4. A kind of injection mold for internal thread demoulding according to claim 3, characterized in that, a plurality of second connecting columns are inserted on the movable template, each of the second connecting columns has a Second stripping springs are sheathed, and the lower end of each second stripping spring abuts against the upper end of the moving plate. 5. A kind of injection mold for internal thread demoulding according to claim 4, characterized in that, the lower end of the fixed template is provided with a guide sleeve, the moving plate is provided with a guide post, and the upper end of the guide post is It runs through the movable template and is movably inserted in the guide sleeve.