CN207154749U - A kind of low pressure casting spreader - Google Patents

Abstract

A kind of low pressure casting spreader, spreader front end are indent moulding, and the oblique section diameter between spreader and sprue bush is more than sprue bush central cross-section diameter.Indent spreader expands the effective area of passage of low pressure casting, increases feeding capacity, and concave shape collects the gas in aluminium alloy, the gas hole defect for solving gate size miscellaneous goods.

Description

A kind of low pressure casting spreader

Technical field

It the utility model is related to a kind of spreader of low pressure casting.

Background technology

Before, conventional low pressure casting spreader is convex shape, and spreader and screen pack, sprue bush are collectively constituted into low pressure System for casting and pouring, when aluminium alloy is flowed into by sprue bush, aluminium alloy turbulent perturbation is reduced through spreader rectified action, then pass through Filter screen enters in mold cavity, until completing low pressure casting process.But many cast product shapes or size limitation sprue bush Size is smaller, i.e., gate area is small, and low pressure casting feeding capacity is poor, the common spreader under the conditions of die venting has some setbacks Complete rectification is played a part of in part, and causing trumpet assembly, nearby gas hole defect occurs in casting, influences operation yield rate, also brings The major quality risk such as product gas leakage.

The content of the invention

In order to overcome existing spreader to solve rectified action of the small cast gate product under the conditions of die venting is not smooth Deficiency, the utility model provides a kind of spreader, and the spreader can not only effectively expand gate area and casting shrinkage energy Power, and gas is in casting center riser in can collecting aluminium alloy in the case of die venting is not smooth, in postorder processing Remove.

Technical scheme is used by the utility model solves its technical problem：Spreader evagination moulding is changed to concave shaped Shape, oblique section diameter is more than sprue bush central cross-section diameter between spreader and sprue bush, improves effective area of passage, this It is the key for improving low pressure casting feeding capacity, reduces the possibility for the casting flaws such as stomata occur.Meanwhile concave shaped spreader Recess can collect gas in aluminium alloy low pressure casting cavity filling process, do not allow gas to be mixed into casting, greatly reduce Cause occur the probability of gas hole defect near casting trumpet assembly in the case of die venting is not smooth.

The beneficial effects of the utility model are, can be smaller in product gate size and simultaneously in the not smooth situation of die venting The lower increase effective area of passage of cast gate, strengthens feeding capacity, collects gas in aluminium alloy, eliminate centre porosity defect.The shunting Wimble structure is simple and easy, does not increase cost of manufacture.And because of its indent modeling characteristic, the direct thermal shock weakened with aluminium alloy is rotten Erosion, spreader service life of the present utility model also correspondingly improve.

Brief description of the drawings

The utility model is further illustrated with reference to the accompanying drawings and examples.

Fig. 1 is the gate system schematic diagram of traditional spirogyrate spreader.

Fig. 2 is the gate system schematic diagram of the utility model concave shaped spreader.

1. sprue bush in figure, 2. spreaders, 3. screen packs.

Embodiment

As shown in figure 1, the sprue bush of prior art, spreader, screen pack form one group of low pressure casting gate system.Its In, spreader is deep into sprue bush highest section, and rectification aluminium alloy enters mold cavity by screen pack.

As shown in Fig. 2 sprue bush（1）, spreader（2）, screen pack（3）Form one group of low pressure casting gate system.Wherein, Oblique section diameter should be greater than the central cross-section diameter of sprue bush 1 between spreader 2 and sprue bush 1.Expand actual cast gate area of passage, Play rectification aluminium alloy simultaneously and pass through screen pack and enter mold cavity.

Claims (1)

1. a kind of low pressure casting spreader, it is characterized in that：The moulding of spreader front end is concave shaped, between spreader and sprue bush Oblique section diameter is more than sprue bush central cross-section diameter.