SU1671398A1 - Equipment for vacuum moulding - Google Patents

Abstract

The invention relates to a foundry and can be used in the manufacture of non-separable molds based on burning out models obtained using vacuum without a binder in the composition of the molding material. The aim of the invention is to expand the range of castings obtained by using the entire working space of the cavity cavity. The tooling consists of the flask 1 and a perforated funnel-shaped pallet 5, which forms the evacuating cavity 6 with the flask and the ball valve 8 mounted on the body, the spindle 10 of which is placed outside the flask associated with the pipeline 12 of the pneumatic conveying system. The use of the invention will make it possible to obtain castings of any profile and configuration within the mold cavity and reduce gas emission into the surrounding space by increasing the active surface area of the perforated pallet evacuation. 3 hp f-ly, 2 ill.

Description

The invention relates to a foundry and can be used in the manufacture of non-separable molds based on burning out models obtained using vacuum without binding in the molding material.

The purpose of the invention is to expand the range of castings obtained by using the entire working space of the supporting cavity.

Figure 1 shows the equipment with the model, filled with molding material, the ball valve is closed; figure 2 - the same, with casting, the ball gate is open.

The equipment consists of flask 1, having a bottom 2 with a nozzle 3, a grid 4, a perforated funnel pallet 5, made in the form of a funnel and forming a vacuum chamber 6 with the flask 1, At the bottom 2 of the flask 1, coaxially nozzle 3 is fixed which houses the ball valve 8, an elastic seal in the form of, for example, a flat ring 9 and a control spindle 10, the end of which is outside of the flask 1 and has a seal on the vacuum cavity 6 from the external environment in the form of, for example, a round elastic ring 11. Patrub ca 3 is connected to the pipeline 12 of the pneumatic transport system of the molding material. The cavity of the flask 1, limited by the counter-bed, the pallet 5 and the ball valve 8, is filled with molding material 13, in which the model 14 with the model of the sprue system is burned out. The shape counter is covered with a synthetic film 15.

Tooling works as follows.

Before the spindle 10 of the ball valve 8, mounted in the housing 7, overlaps, the working opening of the pallet 5 closes, forming an evacuating cavity 6 in the flask 1. The density of the ball valve 8 is provided by an elastic flat ring 9.

Then the flask 1 is filled with molding material 13 to the level required to install the burned-out model 14 and ensuring a permissible temperature effect on the mesh 4. After that, the flask is filled completely with molding material 13, vibro-compacted and leveled to the control level. Then, a synthetic film 15 is applied to the mold counter, a vacuum source is switched on, and a vacuum in the mold is created through the pipeline 12, the vacuum space 6 and the perforated pan.

Liquid metal is poured into the mold prepared in this way by known technology, model 14 is burned out and casting 16 is obtained. After the casting is solidified, the remains of the synthetic film 15 are removed, and the ball valve 8 is opened by spindle 10

The molding material 13 through the through-hole of the ball valve 8 enters the pipeline 12. After the mold cavity is cleared from the molding material, the vacuum is disconnected, the casting 16 is removed and

0 prepare tooling for the next molding.

The cycle of operation is repeated. The use of the invention allows within the limits specified by the dimensions of the

5 forming cavity, to receive castings of any profiles and configurations, including blind covers, die plates, body parts or small-sized cluster castings; reduce gas emission

0 into the surrounding space by increasing the active surface area of vacuuming the perforated pan; eliminate the need for a workshop lifting device for technological servicing of the flask of the flask (installation in the flask, removal from the flask, transportation to the storage area, etc.) due to a change in the type of locking member and its layout with the flask; to mechanize in any known way the drive of the ball gate of the locking device; facilitate the work of the moulder operator as there is no need for installation, removal and transportation of the perforated pipe.

Claims (4)

Claim 1. Equipment for vacuum forming, comprising a flask with an integrated filter sheath, filled with a dry forming material, while the filter sheath forms a vacuum chamber with the walls of the flask, and in the lower cone-shaped part of the flask there is a mesh and a valve installed in a hermetic intake a pneumatic conveying chamber connected to the pipeline of the pneumatic conveying system of the molding material, characterized in that, in order to simplify the design of the rig and reduce the time for its maintenance, it is equipped with a funnel-shaped filter tray with a flange installed under the screen, and a locking device mounted on the flange of the funnel-shaped filter of the rubbing tray, and its control member is hermetically sealed beyond the size of the flask, and the vacuum filter chamber is combined with a sealed pneumatic transport chamber and is a single a vacuum intake compartment bounded by the lower funnel of the flask and a filter pan, while the outlet of the flask is located coaxially with the flange of the filter pan and connected to the pipeline of the pneumatic conveying system. 2. Equipment of pop.1. characterized in that the shut-off device is a ball valve. 3. Equipment pop.1, characterized in that an annular seal is placed between the locking device and the flange of the filter pan. 4. Equipment pop.1, characterized in that the control element of the locking device is connected to a remotely controlled actuator.