SU707810A1 - Mould for making polymeric articles - Google Patents

Description

one

The invention relates to devices for processing plastics into products, in particular, it can be used in the manufacture of products with a narrow closed cavity with protrusions located on the inner surface.

Injection molds for the manufacture of plastic articles with undercuts are known, which contain a stationary holder with inclined pins, sliding semi-matrixes, a punch, a punch holder with attached cadmium semi-matrixes, a sign that draws an undercut, and an ejector system 11.

Such forms do not allow the manufacture of products with closed cavities of a narrow profile, within which there are protrusions, since the sign does not allow this, and moreover, the central rod between the sectors is not possible

Also known is an injection mold for the manufacture of products made of polymers, containing a composite matrix comprising two pairs of diametrically placed semi-matrices, an intermediate plate on which one of the pairs of diametrically placed semi-matrices is fixed, two pairs of inclined columns with which the half-matrix interacts, a composite sign consisting of from concentrically located fixed and movable parts, a pusher plate connected in t with an intermediate plate, and a support plate 2.

In a known form, it is impossible to make protrusions on the inner surface of a closed loop article, since parts of the composite mark are fixed on opposite plates of the form.

The purpose of the invention is to provide

15 making protrusions on the inner surface of a long closed-loop article.

The goal is achieved by the fact that the fixed part of the mark is made with a through longitudinal stepped hole, and the movable part of the mark is installed in it with the ability to relate (the 1st movement, and the second pair of semi-matrixes is placed on

base plate, with sloping columns interacting with a pair attached to the intermediate plate

semi-matrices are made with an inclined section oppositely directed

30 tilt columns, and oblique columns.

interacting with the semi-matrix placed on the base plate, mounted in a cage that is connected with the fixed plate, and that, with the aim of automatically resetting the gating system, on the contacting surfaces of the semi-matrix installed in the guide plate of the base plate, the holes that form in the closed position of the semi-matrices, the undercut under the central sprue, and the grooves exceeding the size of the grooves, form with the grooves of the opposite half of the trits of the cavity in the open position of the semi-matrix.

The invention is illustrated in the drawings, where in FIG. 1 shows a casting mold in a longitudinal section; in fig. 2 is a top view of the semi-matrix, in plan along the plane of the connector; in fig. 3 is a section A-A in FIG. 2; in fig. 4 is a longitudinal section of the mold in the open position; in fig. 5 - the position of the movable part of the mark after removing it from the item. whether; in fig. b depicted in the semi-matrix of the base plate; in fig. 7 .- view in plan of the semi-matrix of the support plate.

The casting mold contains a fixed casting plate 1, a clip 2 with inclined columns 3, made with an inclined section opposite to the inclined column, and inclined columns 4, with columns 3 interacting with semi-matrix 5 placed on the intermediate plate b, and columns 4 - with diametrically placed semi-matrix 5 semi-matrix 7, mounted in guides of the support plate 8 rigidly connected to the base 9, plate 10 of the ejector 11, connected by steps 12 with the intermediate plate b. The yoke 2 is connected by means of 13 with a fixed plate 1 in which the fixed part 14 of the mark is fixed, made with a longitudinal through stepped hole. In the hole of the fixed part of the mark there is a concentric movable part 15, which forms protrusions on the inner surface of the product. Base plate 8 is connected with base 9.

On the contacting surfaces of the semi-matrix 7 placed in the guides of the base plate 8, grooves 17 are formed, which in the closed position of the semi-matrix undercut under the central sprue 18, and the grooves 19, whose dimensions exceed the dimensions of the grooves, and the grooves in the open position of the semi-matrix form cavities with grooves opposite semi matrices.

Casting form works as follows.

The molten polymer mass is injected into the molding cavities.

After cooling, the form is opened and the movable part of the form departs from the fixed plate 1. The fixed part 14 of the mark leaves the product as the moving part of the form moves, and the movable part 15 of the sign follows the product due to the protrusions made on its inner surface. After the stationary part of the mark comes out of the product, the mile 13 selects the stroke, the rif holder 2 stops, and the hemisphere b when moving them along the inclined columns 3 compress the product. The protrusions formed on the inner surface of the product emerge from the corresponding recesses of the movable part 15 of the mark, and upon further disclosure, this part of the sign leaves the cavity of the product. The half-matrix 5, interacting with another inclined section of the columns 3, is moved apart and released the product.

Upon further movement of the base 9, which is rigidly connected to the base plate, the product is withdrawn by the ejector 11 from the zone located on the base plate 8. semi-matrix 7, opened, when the form is disconnected from the inclined columns. Simultaneously with the semi-matrix connector 7, the central sprue in the place of its undercut is cut into two parts by the semi-matrix and gets into the grooves 19, freeing the gating system, after which the product and the gating system are free from the mold.

This fors-up design allows one to manufacture simultaneously several products with protrusions on the inner surface of a closed contour completely in automatic mode.

Claims (2)

1. A mold for the manufacture of products from polymers, containing a composite matrix., Comprising two pairs of diametrically placed semi-matrices, an intermediate plate on which one of the pairs of diametrically located semi-matrices is fixed, two pairs of inclined columns with which the half-matrix interacts, the composite sign, consisting from concentrically located fixed and movable parts, a pusher plate, connected by rods with an intermediate plate and a supporting plate, which is characterized in that, in order to ensure the manufacture of high UPOV on the inner surface of a closed loop elongated articles, the mark is stationary part provided with a through longitudinal stepped bore, and the movable plate portion is installed therein with the possibility of relative movement, and a second pair of jaws arranged on the base plate, wherein the inclined column interacting with a pair of semi-matrices fixed on the intermediate plate, they are made with an inclined section opposite to the column inclination, and the inclined columns interacting with the semi-matrix placed on the base plate are mounted in a holder that is connected with the fixed plate. 2. The casting mold according to claim 1, wherein, in order to automatically reset the gating system, grooves are made on the contacting surfaces of the semi-matrices installed in the guide plates of the base plate, which in the closed position of the semi-matrix undercuts under the central sprue, and grooves exceeding the size of the grooves, which form with the grooves of the opposite semi-matrix: the cavity in the open position of the semi-matrix. Sources of information taken into account in the examination 1. Authors certificate of the USSR 443773, cl. At 29 P 1/00, 1974. 2. Authors certificate of the USSR 2198056 / 23-05, cl. In 29 C 1/14, 1975 (prototype). 4 CAA