CN210098890U

CN210098890U - Internal flow channel sand core exhaust passage structure

Info

Publication number: CN210098890U
Application number: CN201821815621.5U
Authority: CN
Inventors: 田中青; 田龙; 田政; 何磊
Original assignee: XIXIA ZHONGDE AUTOMOBILE PARTS CO Ltd
Current assignee: XIXIA ZHONGDE AUTOMOBILE PARTS CO Ltd
Priority date: 2018-11-05
Filing date: 2018-11-05
Publication date: 2020-02-21
Anticipated expiration: 2028-11-05

Abstract

The utility model discloses an internal runner sand core exhaust passage structure, the surface of the internal runner sand core is provided with an eyelet which is communicated with an internal passage of the internal runner sand core, and the eyelet is used for filling raw sand into the internal passage before casting and sealing by using precoated sand; the rear surface of the lower core of the runner sand core is provided with an air hole formed by puncturing through an exhaust needle, and the air hole is communicated with an internal channel of the sand core; and the casting model upper shell is provided with an exhaust channel corresponding to the air hole, and the exhaust channel is communicated with the inner channel of the sand core. Through the design of the exhaust channel of the inner runner sand core, gas generated by the inner runner sand core in the pouring process can be effectively discharged, and the defect of gas holes caused by gas generation of the inner runner sand core is overcome.

Description

Internal flow channel sand core exhaust passage structure

Technical Field

The utility model belongs to the technical field of the casting, specifically be an interior runner psammitolite exhaust passage structure.

Background

In the casting and pouring process, the sand core can generate a large amount of gas within a few seconds under the action of high-temperature molten iron, and if the gas cannot be discharged outside a mold in time, the gas can be left on a casting to cause the casting to generate gas hole defects, so that the design of a sand mold exhaust passage is very critical. In the existing exhaust design, gas generated in the casting process of molding sand forming the appearance of a casting is mainly exhausted through a parting surface, an overflow riser and the air permeability of a sand mold, but the gas generated in the casting process of an inner runner sand core forming the internal shape of the casting needs to be firstly exhausted into a cavity through molten iron, and is exhausted out of the casting through a gas exhaust channel in the cavity such as the parting surface, the overflow riser and the like, if local molten iron is cooled too fast in the casting process, the gas generated in the inner runner is left on the casting to generate a gas hole defect, so that an exhaust channel is designed for the inner runner sand core, the gas generated in the casting process of the inner runner sand core is directly exhausted out of the casting through the channel, and the casting defect caused by the fact that the gas generated in the inner runner sand core is exhausted out of time can be effectively solved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the problem that solves: an exhaust passage of the inner runner sand core is designed, so that gas generated in the casting process of the inner runner sand core is directly exhausted to the outside of the cavity through the exhaust passage, and the defect of casting air holes is reduced.

In order to achieve the above object, the present invention provides the following technical solutions: an inner runner sand core exhaust passage structure is characterized in that holes are formed in the surface of an inner runner sand core and communicated with an internal passage of the inner runner sand core, and the holes are used for filling raw sand into the internal passage before casting and pouring and sealing the internal passage with precoated sand; the rear surface of the lower core of the runner sand core is provided with an air hole formed by puncturing through an exhaust needle, and the air hole is communicated with an internal channel of the sand core; and the casting model upper shell is provided with an exhaust channel corresponding to the air hole, and the exhaust channel is communicated with the inner channel of the sand core.

Preferably, the diameter of the air hole is 4 mm.

Has the advantages that:

through the design of the exhaust channel of the inner runner sand core, gas generated by the inner runner sand core in the pouring process can be effectively discharged, and the defect of gas holes caused by gas generation of the inner runner sand core is overcome.

Drawings

Fig. 1 is the utility model relates to a structural schematic diagram of inner flow channel psammitolite exhaust passage structure.

Detailed Description

As shown in fig. 1, the utility model discloses an interior runner psammitolite exhaust passage structure, the runner psammitolite need be empty through four shells of runner core, forms the inside passage of psammitolite, and the shell is empty to be the punchhole at the opening on surface, and the shell is empty to be sealed with tectorial membrane sand for former sand, prevents that molten iron from getting into the runner.

The raw sand has air permeable gaps, the raw sand is filled in the sand core to increase the strength of the sand core, and the precoated sand is not air permeable.

And after the core of the runner sand core is placed, a phi 4 exhaust needle is used for penetrating the core to form an air hole 1 which is communicated with an internal channel of the sand core. The gas can be discharged out of the runner sand core through the pores and the air holes in the raw sand.

An exhaust channel is arranged at the position of the upper shell corresponding to the runner core air hole 1, the straight-through mold is out, the sand core air hole 1 corresponds to the upper shell exhaust channel after mold combination, and the two channels are communicated and directly exhausted out of the mold through the exhaust channel.

The application range is as follows:

the process is suitable for exhaust in the casting process of the casting runner core sand core.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The inner runner sand core exhaust passage structure is characterized in that holes are formed in the surface of the inner runner sand core and communicated with an internal passage of the inner runner sand core, and the holes are used for filling raw sand into the internal passage before casting and pouring and sealing the internal passage by using precoated sand; the rear surface of the lower core of the runner sand core is provided with an air hole formed by puncturing through an exhaust needle, and the air hole is communicated with an internal channel of the sand core; and the casting model upper shell is provided with an exhaust channel corresponding to the air hole, and the exhaust channel is communicated with the inner channel of the sand core.

2. The internal flow channel sand core exhaust passage structure of claim 1, wherein: the diameter of the air hole is 4 mm.