CS238997B1 - Modular blocks for plastic injection molds - Google Patents

Abstract

Modular blocks for injection molds made of PH are used for spraying very precise gears made of PH and consist of shaped inserts that are slidably mounted in the shaped insert plate and secured with a support plate. From the sprue plate and sprue insert

Description

The present invention relates to a new construction and technologist, modularly molded injection molding blocks for precision plastic gears.

The prior art known block construction of multiple plastic injection molds / Figs. 1 / consists in the fact that the blocks are designed as a whole, which is (despite the requirements for high precision and especially the centricity of the moldings in the manufacture of injection molds very laborious, in some cases unproductive. the construction of the blocks, this tolerance cannot be maintained in the production of the mold.

Disadvantages of the known construction and techn. molds for. Precision plastic gears are replaced by a new design and techn. modular shape. The inserts according to the invention are characterized in that the block of multiple injection molds / FIG. 2 / consist of individual parts that can be manufactured to the required accuracy. The same single parts are manufactured simultaneously for all injection mold blocks, which guarantees exactly the same accuracy of all manufactured parts and hence the accuracy of all moldings in the multiple mold.

In addition, the production of individual block parts is simpler and less labor intensive, which reduces the cost of manufacturing an injection mold by an average of 20%.

An exemplary embodiment of a modular block is shown in the accompanying drawings, in which Fig. 1 shows a schematic cross-section of a prior art block. Fig. 2 shows a schematic cross-section of a folded block; Fig. 3 shows a dividing plane of a folded block.

238 997

According to FIG. 2, the openings 0D2 in the inlet plate 1 and 0Dg of the molded inserts 2 for the modular molded inserts 5 to 9 are ground together in one clamping on the guide columns of FIG. 1, an inlet insert 2 * is pressed ⁱⁿ which a point inlet and a molded part of the molding are located. In the plate of shaped liners 2, shaped, modular liners 5 to 9 are pressed into the cylindrical bore 0 D to a tolerance of + 0.005.

1) Multiple molds are the main advantage in that the individual form inserts, eg §, are always grinded together on a precise mandrel according to the multiplicity of the mold, which guarantees absolutely accurate centricity of the shape with respect to the surface of the form insert. Also, the forces of the form inserts are ground together. 8, 7, 8, 9 are made in the same way. These modular form inserts 5 to 9 are held against axial displacement by a shim plate 4, which is fixed to the form insert plate 2 by screws 11 and secured against displacement by cylindrical pins 1g. The loading plate 4 allows for easy and quick assembly and disassembly of all molded inserts 5 to 9, both during mold production and in case of mold damage during operation and wear. Manufacturing individual form inserts 5 to 9 is simpler and less labor intensive, which reduces the cost of manufacturing an injection mold by an average of 20% while saving capacity on machine professions. '

Modular injection molding blocks for precision moldings cog. The wheels of plastics according to the invention can be used especially in the watch industry and fine mechanics in the manufacture of programmers, especially in electronics.

Claims (1)

Modular blocks for plastic injection molds, characterized in that the individual form inserts (5 to 9) are folded into a molding plate (2) in which it is recessed in the divider plane for an insert (4) which secures the shape of the insert (5 to 9) against ejection.