SU1629139A1 - Method and apparatus of vacuum moulding of castings of the type of disk with curving ribs and undercuts - Google Patents

Abstract

The invention relates to a foundry, in particular, to a vacuum-film forming method for the production of castings such as disks with curved ribs and undercuts. The purpose of the method and device for its implementation is to improve the quality of the antenna form by reducing the gaps of the synthetic film in the areas of the detachable parts of the model v. facilitate removal from the mold half. The device contains a model with detachable parts made in the form of fixed bosses and mounted on them with sinking and fixation of the half-rings on the outer diameter. At the same time, the depth of the drowning of the half-rings relative to the model plane is equal to the thickness of the synthetic film. Vents communicating with the vacuum system are made on the aerial vertical working surfaces of the detachable lugs and half-rings. Vacuum forming method includes preparing an evacuated model, MB; with its synthetic film, filling the ward with dry sand, sealing the latter, sealing the control room, evacuating the cavity of the flask, removing the model, digging out the half-form of the detachable parts of the model (bsbyshek), then removing the half-rings, shaping the discs of casting like a disk with curved ribs AND undercuts mi, and form assembly. The use of progressive technology for producing castings like discs with curved ribs and undercuts reduces the cost by 2.5 times. 2 sec. f-ly, 3 ill.

Description

The invention relates to a foundry, in particular, to a vacuum film-forming process for the production of discs with curved ribs and undercuts.

The purpose of the invention is to improve the quality of the mold by reducing the gaps of the synthetic film in the zones of the volumetric parts of the model and facilitating their removal from the half-molds.

Figure 1 shows the half-form with model tooling, a general view; figure 2 is a view of And figure 1; in FIG. 3, node I in FIG.

The mold half-form 1 (Fig. 1) contains model 2 with detachable lugs 3 and half-rings 4, covered synthetic film 5, flask 6 filled with molding sand 7, and sealed control board 8. Detachable lugs 3 are fixed on model 2 with the help of locks 9 and have gaps 10 between them (Fig. 2), and half rings 4 are mounted on lugs 3 and fixed between themselves and over the outer diameter of model 2, sinking d from its plane. On the working vertical surfaces of the lugs 3 and half-rings 4, vents 11 are connected, which are connected by channels 12 and 13 with vacuum.

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On the landing surfaces with model 2, holes 14 and 15 are made with undercuts (Fig. 3).

The disc manufacturing method includes the following operations.

The first operation (Fig. 1) is to install detachable bosses 3 on model 2 by draining them into a cone lock 9 with a minimum clearance of 10 (Fig. 2). The second operation (FIG. 3) consists in blocking the gaps 10 with detachable half-rings 4, fixing them between themselves and over the outer diameter of model 2. The third operation (figure 2) consists of moving away from the center outwardly from the half-form of the detachable bosses 3, and then detachable half-rings 4 with the help of devices inserted into holes 14 and 15.

The device for vacuum forming contains around the circumference of the model 2 detachable parts of fixed bosses 3 with locks 9, gaps 10 and half rings 4 with sinking and fixing on the outer diameter, freely moving horizontally outwards from the center while on working surfaces of detachable bosses 3 and half rings 4 Vents 11 are made, communicating with channels 12 and 13 with a vacuum. The device also contains in the lugs 3 and semirings 4 on the side of the seating surfaces with the model 2 holes 14 and 15 with undercuts for gripping the devices when removing the detachable lugs and half rings.

Example. Vacuum flask size in clear mm, height 250 mm. The cover of the model is produced by Sevilen synthetic film. The cast disk made of 23HGS2MFL steel weighing 32 kgf has an outer diameter of 540 mm, a height of 140 mm, and 12 curved edges with undercuts. The lower shoulder of the disk (# 540 x 480 mm and 14 mm high with 12 bosses with a diameter of 30 mm and a height of 25 mm is performed by detachable parts, namely 12 bosses fixed in the model on the dovetail, and two semirings with drowning 0.5 to 0.8 mm from the plane of the model and fixing on the outer diameter. The working surfaces of the detachable parts are rubbed with graphite pencil.

The use of the proposed device and method for vacuum moldsichi allows casting complex steel discs from alloyed steel grades without the formation of hot cracks, since the absence of sand cores makes it possible to maximize the advantages of a flexible vacuum form.

The use of progressive technology for the production of castings such as disks with curved ribs and undercuts reduces the cost by 2.5 times.

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Claims (2)

1. A vacuum forming device for casting discs with curved ribs and undercuts containing a model with detachable parts, characterized in that, in order to improve the quality of the mold by reducing the ruptures of the synthetic film in the zones of the detachable parts of the model and facilitating their removal from the half-form, the detachable parts of the model are made of composite in the form of lugs and semirings, having vents on the vertical working surfaces connected to a vacuum system, the semirings are installed on the lugs below the plane of the model on the film thickness, while on the outer surface of the model and on the detachable parts are made fixing elements. 2. Method of vacuum forming castings like discs with curved ribs and undercuts, including installation of detachable parts on the model, covering it with a synthetic film, filling the mold box with molding sand, sealing the latter, sealing the control room, evacuating the cavity of the flask, removing the model and assembling the mold, characterized in that, in order to improve the quality of the mold by reducing the ruptures of the synthetic film in the zones of the detachable parts of the model and facilitate their removal from the half-form, when installing the detachable parts, they set the semiring, and the removal of detachable parts start with bosses. eight 7 I 8 id FIG. 2 P Fig.Z