RU2668439C2 - Pressing mould for manufacture of dowels from polymeric material - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: pressing mould for manufacture of dowels made of polymeric material contains movable (1) and stationary (2) dies, forming surfaces (3), forming nests (4), forming the shape of the dowels, punches (5) in the form of thin rods forming in nests (4) central hole of the dowel, pushers (7) with the possibility of pushing out of them a ready-made dowel. The forming nests (4) and the pushers (7) are located in the forming surface (3) of the movable die (1) and are installed along the direction of movement of the movable die (1). The pusher (7) is installed inside each nest (4). The punches (5) are fixed on the stationary die (2) coaxially opposite each nest. On the stationary die (2), a channel (6) for supplying a polymeric material is provided.

EFFECT: increase the productivity due to reduction of dowels manufacturing time.

8 dwg

Description

The invention relates to devices for the processing of plastics and can be used for the simultaneous manufacture of products of complex configuration by injection molding in an automatic mode, in particular plastic dowels designed for attaching heat-insulating material to the walls of buildings and structures.

A known mold for the manufacture of dowels made of a polymeric material, consisting of a fixed and movable matrix, the latter consists of two half-matrices, inside each of which are installed shaping surfaces with shaping nests located on them, forming the shape of the dowel when they are connected, mounted on a fixed matrix punches in the form of thin rods forming the central hole of the dowel in the sockets, a removal plate installed in a fixed matrix to eject the hardened dowel from the press molds (Molds for the dowel umbrella (dowel for foam), Ivano-Frankivsk, website: http://ua.bizorg.su/press-formy-dlya-litya-plastmass-r/p5416503-pressforma-na-dyubely- zont-dyubely-dlya-penoplasta-ivanofrankovsk).

A disadvantage of the known mold is that on the forming surface it is possible to arrange the forming nests in only one row, along the line of separation of the two half-matrices of the movable matrix. Due to the impossibility of arranging the forming nests in several rows, the production time of dowels is increased and, accordingly, the productivity of their production is reduced. In addition, a removable plate is used to push the finished dowels from the forming sockets, which complicates the maintenance and repair of the mold due to the fact that the removal plate is a complex technical device.

The closest technical solution, selected as a prototype, is a mold for the manufacture of dowels, containing a fixed and movable matrix, forming surfaces, forming nests forming the shape of the dowel, punches in the form of thin rods forming the central hole of the dowel in the nests, pushers installed in a movable matrix for each forming socket with the possibility of pushing out a hardened dowel from it. In each matrix, half of the forming surface is located, forming the shape of the dowel when they are connected to supply heated plastic mass to the formed shape. The punches are mounted on sliding holders in the form of strips mounted between the dies, while the sliding holders are moved apart in the perpendicular direction relative to the direction of movement of the dies (Molds "Timity (Timity) Molds and Plastics Co., LTD", CN, 2011, http: // www.timity.com/ocherednie-pressformy-na-dubeli-ankery/).

A disadvantage of the known mold is that only half of the forming surface is located in each matrix, and to form a socket forming the shape of the dowel, an additional operation is required to connect them to form the dowel, which takes time to complete, resulting in the production time of the dowel in overall increasing. The forming nests are located perpendicular to the movement of the matrices, respectively, and the punches attached to the sliding holders are moved apart in a perpendicular direction relative to the direction of movement of the matrices. This also leads to the need to use an additional operation to extend the punches, which takes time to complete, as a result of which the production time of the dowel as a whole increases. Due to the loss of time, the production capacity of dowels is reduced. In addition, the need to use additional operations in the manufacture of dowels accelerates the wear of the dies, and therefore reduces the life of the matrix as a whole.

The invention is based on a technical problem, which consists in increasing productivity by reducing the manufacturing time of dowels.

To solve the indicated technical problem and achieve the technical result provided by the invention, in a mold for manufacturing dowels from a polymeric material containing movable and fixed matrices, forming surfaces, forming nests, forming the shape of the dowel, punches in the form of thin rods forming central in the nests dowel hole, polymer material supply channel, pushers with the possibility of pushing the finished dowel from the forming surface, according to the invention forming the blind and pushers are located in the forming surface of the movable matrix and are installed along the direction of movement of the movable matrix, while the pusher is installed inside each slot, the polymer material supply channel is made on a fixed matrix, on which punches are located coaxially opposite each forming slot formed on the movable matrix.

The location of the forming nests forming the shape of the dowel in the forming surface of the movable matrix along the direction of its movement, the installation of a pusher inside the forming surface of the moving matrix inside each forming slot, the location of the feed channel of the polymeric material on the fixed matrix, and also fixing the punches on the fixed matrix coaxially opposite each socket (and not on sliding holders) allows you to reduce the number of operations in their manufacture, which leads to a reduction in the time catching dowels, which increases the productivity of manufacturing dowels.

The location of the forming nests in the forming surface of the movable matrix along the direction of its movement increases the number of placement of forming nests on the same area of the forming surface in comparison with their transverse arrangement, as a result of which the production capacity of dowels is increased.

At the same time, reducing the production process by only one or two operations helps to reduce the wear of the dies, which means that the service life of the mold as a whole increases.

The matrix includes the following elements:

1 - moving matrix

2 - fixed matrix

3 - forming surfaces

4 - forming nests

5 - a punch in the form of thin rods

6 - plastic feed channel

7 - pusher

In FIG. 1 shows a General view of the mold for the manufacture of dowels from a polymer material, a longitudinal section;

in FIG. 2 shows the matrices in a disconnected position, shaping surfaces are located on the movable matrix, forming nests forming the shape of a dowel, punches in the form of thin rods are fixed on the fixed matrix, coaxially opposite each nest, longitudinal section in axonometric view;

in FIG. 3 shows the matrix in a disconnected position, pushers are fixed on the movable matrix, in a section, a perspective view;

in FIG. 4 shows the matrix assembly, a section in a perspective view;

in FIG. 5 shows two matrices in a disconnected position;

in FIG. 6 shows a mold in a connected position, a longitudinal section;

in FIG. 7 is a view A in FIG. 6 shows a shaping surface, enlarged, longitudinal section;

in FIG. 8 is a view B in FIG. 7 shows a part of the forming surface, a longitudinal section.

The mold consists of a movable 1 matrix and a fixed 2 matrix (Fig. 1-8). The dimensions of the movable matrix 1 exceed the dimensions of the stationary matrix 2. In the movable matrix 1, forming surfaces 3 are made, forming nests 4 for the manufacture of dowels (not shown). Slots 4 are located longitudinally relative to the movement of the movable matrix 1, which increases their number 4 on the same area of the forming surface 3 of the movable matrix 1. In the fixed matrix 2, punches 5 are fixed in the form of thin rods forming the central hole of the dowel in the sockets 4. The punches 5 are mounted on the same axis of symmetry with the sockets 4 under the dowel with the possibility of entering the hole of the socket 4. On the fixed 2 matrix, a channel 6 is made for feeding the molten polymer material, for example plastic, into the nests 4. To remove the finished dowels from the forming surface 3 (or nests 4) after cooling the molten plastic on the movable matrix 1, a pusher 7 is installed inside each nest 4. Several dowels can be formed in the mold at the same time (multi-seat form).

The inventive mold works as follows.

For the manufacture of dowels, a mold is assembled. For this, matrices 1 and 2 are connected. Punches 5 in the form of thin rods are pushed into the forming surfaces 3, forming nests 4 under the dowel, forming the central hole of the dowel in them. Through channel 6, molten polymeric material, for example plastic, is fed under pressure into the forming surfaces 3, which fills the forming sockets 4. The estimated time for cooling and solidification is expected. Then, the movable matrix 1 is withdrawn from the stationary matrix 2, punches 5 are removed from the forming surface 3, and at the same time, pushers 7 installed inside each socket 4 push the cooled dowels formed in them.

Thus, the proposed design of the mold allows you to reduce the manufacturing time of dowels and thereby increase the number of manufactured dowels and at the same time reduce the wear of the matrix as a whole by reducing the number of operations for the production of dowels.

Claims (1)

Mold for the manufacture of dowels made of polymer material, containing movable and fixed dies, forming surfaces, forming nests forming the shape of the dowel, punches in the form of thin rods forming the central hole of the dowel in the nests, the feed channel of the polymer material, pushers with the possibility of pushing out of them finished dowels, characterized in that the forming nests and pushers are located in the forming surface of the movable matrix and installed along the direction of movement of the movable matrix, wherein the pusher is installed inside each socket, the polymer material supply channel is made on a fixed matrix, on which punches are located coaxially opposite each socket formed on the moving matrix.

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