Feeding device and system and high pressure molding method

Abstract

The invention discloses a feeding device, a feeding system, and a high-pressure molding method that belong to the technical field of casting, the feeding device comprising a locating element for connecting with a sleeve and a knock-off element connected with the locating element, in which: the locating element is in the shape of a disk with a through hole at the center, and a boss extending upwards is provided at the center of the locating element at the location of the through hole; the knock-off element is tube-shaped, with its upper part being cylinder-shaped and lower part being cone-shaped, and the upper part of the knock-off element is interference fitted in the boss of the locating element; the locating element and knock-off element are both made of metal. In present invention, the pressure subjected by the sleeve is reduced by the relative displacement between the locating element and the knock-off element that results from friction, thus achieving an effect of buffering and protecting the sleeve relatively well. The problems of sand loss resulting from the contact and friction between the knock-off core and the sleeve and the sleeve being prone to inclination in the prior art can be avoided in the invention.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a feeding device and system and a high-pressure molding method using the feeding device and system. Background technique [0002] During the casting process, most of the molten metal liquid will reduce in volume during cooling and solidification, which is called shrinkage. If no measures are taken against this phenomenon, shrinkage cavities and shrinkage defects will occur inside the solidified metal casting. In order to prevent casting defects, it is necessary to ensure that there is replenishable molten metal during the solidification of the casting to fill the cavity formed in the interior of the casting due to the shrinkage of the liquid volume. This process is called "feeding the casting" and the reservoir that provides the fed metal is called the riser. After the sand falling out of the casting, the riser needs to be removed from the casting. In order to facilitate the re...

AI Technical Summary

Problems solved by technology

The problem existing in the use of this kind of easy-cut sheet is: in the process of high-pressure molding, the easy-cut sheet basically has no buffering effect on the pressure on the riser, and the riser itself still needs to withstand the molding of high-pressure molded plate extrusion green sand Pressure, the riser is easily damaged, and increases the cost of riser production; the easy-cut piece is easy to break or break, resulting in poor subsequent mold drawing, and at the same time, the sand produced by the easy-cut piece is easy to fall into the cavity. If it is not cleaned, Can cause defects of sand holes and pores in castings

[0008] (1) In the process of high-pressure molding, the relative displacement between the easy-cut piece and the riser can reduce the pressure on the riser through friction, and play a buffer role to better protect the riser. However, in this process, The sand ribs of the riser will be damaged, and the damaged sand grains will enter the cavity. If it is not cleaned in time, it will cause defects of sand holes and pores in the casting, and the casting will be scrapped

[0009] (2) The easy-cut sheet has high requirements on the size of the riser, and the existence of sand ribs also complicates the shape of the riser, which affects the production efficiency and yield of the riser

[0010] (3) The inner cavity of the riser is provided with a draft slope, and the upper end of the easy-cut piece is cylindrical, and the coaxiality of the two plug-in fits is poor, so when the high-pressure mold plate squeezes the sand mold, the riser is prone to tilt , resulting in poor feeding during casting

The problem existing in the use of this kind of easy-cut sheet is: this kind of easy-cut sheet alleviates the figure 2 The wear and sand loss problem of the easy-cut piece shown in the figure, but because the easy-cut piece and the riser are still an interference fit, this problem cannot be completely avoided, and at the same time figure 2 The other problems with the easy-cut sheet shown are not solved

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