SU897552A1 - Mould for producing polymeric material articles - Google Patents

Description

The invention relates to equipment for the production of articles by foaming from a monolithic blank, for example a polycarbonate product, and can be used in various industries. The known form for the manufacture of products from polymeric materials, containing a matrix, an upper punch, several lower punches, concentrically located relative to each other, and an actuator, providing movement of the set of punches 1. The disadvantage of this form is the complexity of the drive design, which ensures the movement of the punches and their mutual arrangement. Closest to the proposed technical essence and the achieved result is the form for the manufacture of products from polymeric materials containing a movable matrix of the upper and lower punches, each consisting of a central punch and concentrically located on its outer surface and movable relative to it outer and inner sleeves 2. | . The disadvantages of this form include the complexity of its design, due to the presence of power elements, ensuring the movement of movable bushings and the matrix. The purpose of the invention is to manufacture products of complex configuration from expandable materials. This goal is achieved by the fact that in the form for the manufacture of products from polymeric materials containing a movable matrix, upper and lower punches, each consisting of a central punch and concentrically located along its outer surface and movable relative to it external and internal bushings, the movable matrix is provided with an installed in its upper part a ring rigidly connected with a cracker interacting with the outer sleeve of the upper punch, moreover,

the die and the outer and inner sleeves of the lower punch are made with protrusions and corresponding depressions on the mating surfaces.

The drawing shows the form, right view, the working position.

The form contains a matrix 1, which is set movably relative to the upper 2 and lower 3 plates of the mold. The ring 4 is attached to the die 1, which is associated with the upper punch. The upper punch consists of a central punch 5 and concentrically located on its outer surface and movable relative to it sleeves 6-8. The upper punch is connected with columns 9 and the bottom plate 3 to the lower punch. The lower punch consists of a central punch 10 and movable sleeves 11 and 12 arranged along its outer surface, which are inserted one into the other and are made with retaining lugs 13, interacting with their corresponding depressions on the mating surfaces, and the protrusions define the height dimensions of the foamed billet . For holding the molds under pressure, there is a rusk 14.

The form works as follows.

A monolithic disk-type preformed, saturated with inert gas is placed into the mold cavity formed by the die and punches. It is possible to obtain such a preform from granular material directly in this mold in the presence of good seals that provide an inert atmosphere during pressing. After installation of the workpiece, the ring 4 and the cracker 14 are fixed. As a result of the heating and holding of the workpiece, the pressure in the mold cavity rises, it acts on the moving parts of the mold). The ratio of the torpedo areas of the upper and lower punch is chosen in such a way that the pressure of the foam material creates a difference in the forces acting on the moving parts. The areas of the upper and lower punch ends can be determined from the following P (5, - Sa) Q-F ratio,

where P is the pressure in the cavity of the mold, 5. - the area of the end of the upper punch.

The area of the end face of the lower punch Q is the weight of the moving parts of the mold, F is the frictional force of the moving parts

Press forms.

Cracker 14, sleeves 6-8 are raised, interacting with ring 4, raise matrix 1 and sleeves 11 and 12 until their movement is limited to projections 13. After curing, the product is removed from the mold.

The described device allows the formation of articles of complex configuration from foaming materials using the pressure of the foaming material to create a force for moving the moving parts of the mold, therefore the device does not require an actuator for the upper and lower punch, as well as mechanisms for adjusting the installation of the sleeves, which simplifies the design forms.

Claims (2)

1. USSR author's certificate No. 490686, cl. On 30 May 11/06, 1973. 2. The patent of Germany No. 1627919, cl. B 30 B 11 / O2, 1974 (prototype). W aj;