SU1066724A1 - Tooling for testing moulding material in vacuum moulding - Google Patents

Abstract

ACCESSORIES FOR TESTING FORMING MATERIALS IN VACUUM FORMING, containing a molding table with a vacuum cavity, a model with a model plate and a flask with a branch pipe and a vacuum chamber, characterized in that, in order to ensure the stability of the conditions and accelerate the tests of the anti-burn coatings and differently grained. The flask is equipped with a detachable dividing frame, made in the form of partitions fastened together, forming autonomous cavities in the flask.

Description

The invention relates to a foundry, in particular to vacuum molding, and can be used in the manufacture of cast samples for the study of molding materials and surface roughness.

Known technology and equipment for the manufacture in molds obtained by vacuum molding, cast stepped samples (with thickness of steps of 3,6,12 and 24 mm) to study the surface roughness depending on the wall thickness of the casting, nonstick coatings and grain size of dry molding sand fl.

The disadvantage of this technology and equipment is the need to study the effect on the surface roughness of various nonstick coatings and different-grained molding sands for the manufacture of separate forms with each nonstick coating or molding sand, which increases the labor intensity and performance of the research, increases the metal consumption and reduces the accuracy of the experiment. , as in the manufacture of molds it is difficult to maintain at one level the parameters during compaction, vacuum modes for each stifomas, as well as the temperature of the alloy poured into them and its chemical composition during several heats.

Closest to the proposed technical essence and the achieved result is the equipment for vacuum forming, which contains a forming table with a vacuum cavity, a model with a model plate and a flask with a nozzle and a vacuum chamber 2,

The disadvantage of " 1 of this tooling is that it is not possible to simultaneously use various nonstick coatings and different-grained molding sands in the manufacture of molds.

The purpose of the invention is to ensure the constancy of the conditions and accelerate the testing of nonstick coatings and different-grain molding sands I

This goal is achieved by the fact that in the equipment for testing molding materials for vacuum molding, which contains a molding table with a vacuum cavity, a model with a model plate and a flask with a branch pipe and a vacuum chamber, the flask is provided with a detachable dividing frame made in the form of partitions fastened together. Opoka autonomous cavities.

Due to the fact that the stepped samples allow the surface roughness to be investigated only on

horizontal surfaces, a model tooling was also used to produce box-shaped samples of different thicknesses for the study of surface roughness on vertical surfaces.

FIG. 1.figured equipment for vacuum forming in the manufacture of the top half of the box-shaped differently thick sample; Fig.2 section A-Ana Fig.1; Fig. 3 shows the equipment for the manufacture of the bottom half-form of a box-shaped sample assembled with a molded flask; Fig. 4, an assembly form for producing a gauge box sample; Fig. 3 shows the equipment for a vacuum mold with the model of a stepped sample in the manufacture of the upper half-form; in fig, b - section bb in fig.Z.

The tooling (Fig. 1) includes a molding table 1 with a nozzle 2 for connection to a vacuum system or communication with the atmosphere, a model plate 3 from a model top 4 of a boxed-thick sample and one hundred to 3, lined with a synthetic thermoplastic film 6, with a 7-second side filter sheath 8 and pipe 9 for connection to the vacuum system, equipped with a detachable separating frame 10. Model plate 3 with model 4 are mounted on the molding table 1 and connected to its cavity 11 by through holes 1

Flask 8 (Fig. 2) is filled with molding sands of various grain sizes 13-16, insulated by partitions of the stripping frame 10.

The rigging with the model of the bottom 17 of the box-shaped different-thickness sample (Fig. 3) is mounted on the molding table 1, equipped with a branch pipe 2. Connected to a vacuum system. Or a connection to the atmosphere. Model 17, lined with synthetic film 18, is fitted with a flask 19 with a filter sheath 20 and a spigot 21 for connection to a vacuum system. When this flask 19 is filled with molding sand 22, sealed by element 23, and the pipe 21 is connected to a vacuum system.

The nozzles 21 of the upper and lower semi-forms are connected to a vacuum system (figure 4).

Equipment for vacuum forming with a model of a stepped sample 25 installed on a model plate 24, lined with a synthetic film 26, is shown in FIG. While the pipe 2 molding table 1 is connected to a vacuum system. On the flat plate .24, the flask 27 is installed, equipped with a detachable frame 2. Flasks 27 (FIG. 6) are filled with molding sands 29.30 and 31 of different grain sizes. Vacuum forming is carried out as follows. A model plate 3 is installed on the molding table 1. A model of a raznoraschinennogo boxed sample and a stand 5 is installed on the molding table 1. The model and the molding plate are connected to the cavity 11 of the molding ytol by 1 through holes 12. When the model is coated with a synthetic film, the junction 2 of the molding table 1 is combined with a vacuum system. The flask is fitted on the model plate and model, lined with film, and provided with a detachable dividing frame 10, made in the form of partitions fastened together. The partitions are in close contact with the forming surface of the model, breaking the model surface into areas isolated from each other. - on the isolated ot each other cavity. Various nonstick coatings are applied to the corresponding areas of the model, and the flasks are filled with molding sands of various crunchiness, for example, 13-16. After vibrating compaction, the detachable frame 7 is removed and the molding sand communicates with each other. Then they are sealed, and the cavity of the flask is connected to the vacuum sietem by means of a pipe 9 .. The molding table 2 of the molding table is disconnected from the vacuum system, and the finished half of the top is removed. model and model plate. Hemoform can also be made using one non-stick coating and molding sands of different grains or using different anti-burn coatings and one molding sand. When using a single nonstick coating, it is applied to a model lined with a synthetic film before the flask is installed, and using different antiburning coatings and a single sand, a detachable dividing frame is removed from the flask after applying to the different nonstick coatings. After the mold half has been fabricated, model plate 3 with model top 4 is removed from the molding table and the model is installed. a bottom 17 of a differently thickened box-like sample, which is lined with a synthetic film 18, while the nozzle 2 of the molding table 1 is connected to a vacuum system. A flask 19 is installed on the model with a filter sheath 20 and a pipe 21. The mold is filled with molding sand 22. After vibrating compaction of the molding sand, the flask is sealed with film 23 and its cavity is evacuated by connecting the adapter 21 to a vacuum system. The nozzle 2 is disconnected from the vacuum system and the finished half-mold is removed. In this case, the cavities of the form a, S, C (the other two are not visible) that form the stems of the specimen have a different width. A mold for preparing a stepped sample is made in a similar manner. Example. Manufactured and mounted on model plates of the model of the top and bottom to obtain a different thickness box-shaped sample with vertical wall thicknesses (clockwise on the right) 3,6,12 and 24 mm and horizontal 24 mm. The material of the top model is steel, the bottom models are aluminum. Sample size K100 mm. Mold manufacturing is carried out in flasks with measurements of 400x500 "x 150 mm. The DNP of cladding of the shaping surface is applied by the Savilen film with a thickness of 0.1 mm, the DPF of the sealing of the flask is a plastic film of 0.05 mm thick. The molds are cast with an Af-9 alloy, which is prepared in a laboratory furnace of resistance with a capacity of 20 kg. Metal capacity forms 9 kg. The vacuum in the upper half-mold was 30, and in the lower - 20 kPa. The effect on the surface roughness of a nonstick coating with a thickness of 0.1 and 0.2 mm is investigated. quartz sand fraction of 0.16, 0.2 mm. The mold is manufactured as follows. After the top of the model is coated with a synthetic film, a flask is installed on it, equipped with a detachable dividing frame that breaks the model along the axes into four areas isolated from each other, and the flask into four isolated cavities. An anti-stick coating with a thickness of 0.1; 0.2; 0.1; Oh, 2 mm (right clockwise). After it dries, the cavities of the flask are successively filled with sands of 0.16 grit; 0.2; 0.16; 0.2 mm (clockwise on the right). After vibratory compaction, the removal frame is removed, the flask from above is sealed with plastic wrap, the cavity of the flask is connected to the vacuum system and the finished half-mold of the top is removed.

In the manufacture of the bottom half-mold, the cavity of the flask is filled with sand from the Millerovsky open-pit mine of grade 1KO16B.

After the bottom mold has been made, the mold is assembled and is cast with the Af-9 alloy of one heat.

Thus, each vertical outer surface of the sample was obtained with a nonstick coating of various thickness and the use of sands with different grain sizes (Table 1).

Table 1

Comparative characteristics of the proposed method in comparison with the prototype are given in table. 2,

Table 2

36

7,6

2.1

The roughness study is performed on an MIS-11 microscope.

f (- / (

G7

-f f f

G5

n.2

the use of mathematical methods for planning experiments.

f f .f f

20

Fy

21

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27; 4 SHlnWj: VYlt .. (i,.:.; Doo.

T X - l; w.: - g and x: | Lp; | Y W W

c / 1.

Claims (1)

ACCESSORIES FOR TESTING FORMING MATERIALS FOR VACUUM FORMING, containing a molding table with a vacuum cavity, a model with a model plate and a flask with a nozzle and a vacuum chamber, characterized in that, in order to ensure constancy of conditions and accelerate testing of non-stick coatings and varnished molding sand. detachable dividing frame, made in the form of sealed together partitions, forming autonomous cavities in the flask.