CN110000338A - A kind of mold of scroll plate product - Google Patents

Abstract

The invention relates to a mould for a scroll product, comprising a positive pressure plate and a counter pressure plate; two asymmetric casting mould cores are placed on the lower half of the positive pressure plate and the counter pressure plate; The side is provided with a small riser whose upper part is connected with the two mold cores respectively; the vertical line of the center line of the casting mold core (the center line is the vertical runner connected to the runner set on the upper part of the positive and reverse pressure plates; on the edge of the runner It is connected with the sprue cup; the vertical runner and the lower vertical runner carry out back pressure; the lower vertical runner and the back pressure riser and the symmetrical position of the back pressure riser is the sand core which is connected to the inner gate and the mold core; the lower vertical runner is connected with the mold core; The bottom end of the runner is a slag collecting trough. The invention can effectively solve the problems of low yield and shrinkage of the casting process, improve the density of the casting, significantly increase the production cost and the qualified rate of the casting, and improve the product quality and economic benefit of the enterprise.

Description

A mold for scroll products

technical field

The invention relates to the design and manufacture of molds in the mechanical casting industry, and is mainly aimed at a casting mold for mechanical parts, specifically a mold for scroll products.

Background technique

At present, there are still many problems in the production of scrolls in the traditional machinery industry. As shown in Figure 1, due to its large weight and the large difference in thickness between positions, it is difficult to make scroll molds. During casting, in places with large thickness, such as the middle, shrinkage porosity or shrinkage cavity is prone to occur, and the process export rate is low, which seriously affects the production cost and quality of castings, and also brings waste of energy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a technical solution that can completely solve the problems of shrinkage cavities and process yield during the production and casting of scroll castings.

The technical scheme of the invention is as follows: a mold for a scroll product includes a positive pressure plate and a counter pressure plate; two asymmetric casting mold cores are placed on the lower half of the positive pressure plate and the counter pressure plate; On both sides of the vertical line, there are small risers whose upper part is connected with the two mold cores; The edge of the runner is connected with the sprue cup; the vertical runner is back pressured with the lower vertical runner; the lower vertical runner is connected with the back pressure riser and the symmetrical position of the back pressure riser is that the inner gate is connected to the mold core. Core; the bottom end of the lower vertical runner is the slag collecting groove.

Adding a trapezoidal riser above the inner gate of the mold can completely solve the technology of loosening and shrinkage. At the same time, adding graphite powder to the sand core can also loosen and shrink the technology, which can achieve the purpose of improving product quality.

The casting of the scroll type mold adopts the composite molding technology, so that the center of the workpiece at both ends, the plane at both ends, and the size and outer circle error are within 0.5mm. Formed within 0.5mm.

Further, the two sides of the center line of the two mold cores are provided with small risers whose bottoms are respectively connected with the two mold cores, and graphite powder is added into the sand cores.

Further, the mold core head adopts an oblique insertion method, and the preferred oblique angle of the mold core is 2-5 degrees.

Further, the small riser is a cold riser, and the shape is a trapezoidal shape.

Beneficial effects of the present invention: the present invention can effectively solve the problems of casting shrinkage and low process yield, can further improve the density of the casting, significantly improve the feeding efficiency of the riser and the casting yield, and improve the product quality of the enterprise.

Description of drawings

Figure 1 is a schematic view of a scroll casting in the present invention.

Figure 2 is a schematic diagram of the positive pressure plate of the present invention.

Fig. 3 is the schematic diagram of the back pressure plate of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in Figures 2 and 3, the present invention includes a positive pressure plate (1) and a counter pressure plate (2); two asymmetric casting mold cores (6) are placed on the lower half of the positive pressure plate and the counter pressure plate; Both sides of the vertical line of the core center line are provided with small risers (7) whose upper parts are connected with the two mold cores respectively; the vertical line of the center line of the casting mold core (6) is the vertical runner (4) connected to the device. The runner (10) on the upper part of the positive and reverse pressure plates; the edge of the runner (10) is connected with the sprue cup (3); the vertical runner (4) is back pressured with the lower vertical runner (8), The lower vertical runner (8) and the back pressure riser (5) and the symmetrical position of the back pressure riser are the sand core (12) connected to the inner gate (11) and the mold core, and the lowermost end of the lower vertical runner (8) For the slag collection tank (9).

When pouring, the molten iron is poured from the sprue cup, and after passing through the horizontal runner and then back-lapped with the vertical runner, the upper vertical runner and the lower runner are back-lapped into the back pressure riser and inner gate, and then into the mold. The core and the small riser communicated with the core. Under the action of the riser and graphite, the phenomenon of shrinkage and shrinkage in the thick part of the casting can be effectively avoided.

The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims (4)

1. A mold for a scroll product, characterized in that it comprises a positive pressure plate (1) and a counter pressure plate (2), and two asymmetric casting cores (6) are placed on the lower half of the positive and counter pressure plates. ), on both sides of the vertical line of the center line of the two mold cores are provided with small risers (7) whose upper parts are connected to the two mold cores respectively, and the vertical line of the center line of the casting mold core (6) is the vertical runner (4). ) is connected to the runner (10) set on the upper part of the positive and reverse pressure plates, and is connected with the pouring cup (3) at the edge of the runner (10), and the vertical runner (4) is connected with the lower vertical runner (8) Back pressure is carried out, the lower vertical runner (8) and the back pressure riser (5) and the symmetrical position of the back pressure riser are the sand core (12) connected with the inner gate (11) and the mold core, and the lower vertical runner ( 8) The bottom end is the slag collecting tank (9). 2. the mold of a kind of scroll product according to claim 1, is characterized in that, the two sides of the vertical line of the center line of the two mold cores are provided with the small risers ( 7) and adding graphite powder to the sand core (12). 3 . The mold for a scroll product according to claim 1 , wherein the small riser ( 7 ) is a cold riser, and the shape is a trapezoidal shape. 4 . 4 . The mold for a scroll product according to claim 1 , wherein the mold core head adopts a chamfer insertion method, and the preferred chamfer angle of the mold core is 2-5 degrees. 5 .