SU1733181A1 - Pattern fitting for making permanent casting mold - Google Patents

Abstract

Use: production of moldless casting molds with undercuts of the working cavity in two mutually perpendicular planes mainly for casting the motor housing. SUMMARY OF THE INVENTION: The model tooling comprises four sections and a section movement mechanism consisting of gear shafts connected to a corresponding intermediate gear section and a vertical rail on which two consecutive teeth sections are made, the rail being driven back and forth. 2 Il.

Description

The invention relates to a foundry, in particular, to a technique for producing castings of complex configuration with undercuts on an outer surface, for example, an electric motor housing.

The purpose of the invention is the expansion of technological capabilities.

Figure 1 shows a composite model, a plan view; figure 2 is the same longitudinal section.

The model tooling has four sections 1, the mechanism for moving which consists of guide and gear shafts 2, gears 3 and vertical rail 4, on which two successively arranged sections with teeth are made. The rail is mounted vertically and has a drive reciprocating movement. Sections 1 are rigidly connected to guides and toothed shafts 2.

A composite four-section model in the expanded state, reproducing

the casting configuration, by means of the toothed rack 4, is inserted into the flask, with the press plates unclenched, the lower press block is in the initial position. After filling the molding sandbox with the model, the upper press block is supplied from above, which forms the gating system. By activating the piston cylinders of the press plates, the lower and upper pads are compressed. Thus, there is a volumetric compaction of the mixture around the model from the side of the flask walls with press plates and pads.

To remove the model from the mold, the upper block first rises, then the rail 4 also moves upwards, and gear 3 begins to rotate, which, in turn, causes the guide and splined shafts 2 to move to the center.

When the sections are flush against the upper inner casing, the rotation of the pinion stops. Starts re (l

WITH

4 SA) SL)

00

Bringing the entire system up to a position in which the lower surface of the sections is above the upper surface of two other sections located on opposite sides. At this point, the rail 4, having the next lower spacing of the teeth, engages with a gear located in the lower inner casing, which in turn drives the guide and toothed shafts 2 that are also in the lower inner casing. When the sections in contact with the lower inner casing, the rotation of the pinion stops and the whole system rises in the same way as described, freeing the mold for subsequent operations.

Thus, the use of the rack-and-pinion mechanism for moving the movable sections allows expanding the technological capabilities of the tooling by increasing the section movement of the sections and the clarity of the execution of the drawing process, as a result, the quality of the undercuts in the mold is improved. The use of two consecutive tooth sections on the movable rail ensures consistent movement of the model sections and allows formation of undercuts.

in two mutually perpendicular planes.

Claims (1)

The invention includes a model tooling for the manufacture of a non-detachable casting mold, mainly for casting an electric motor case, comprising a body consisting of moving sections with a mechanism for moving them in horizontal and vertical planes, characterized in that In order to expand technological capabilities, the model equipment has four sections, and the mechanism for their movement consists of gear shafts, gears and a vertical rail, on which two consecutively located sections with teeth, the rail being mounted vertically and having a drive of reciprocating movement, and the sections are fixed on the gear shafts. 1