CN212094238U

CN212094238U - Local reinforced exhaust structure of large casting

Info

Publication number: CN212094238U
Application number: CN202020264869.8U
Authority: CN
Inventors: 赖正伟
Original assignee: Suzhou Cmb Machinery Co ltd
Current assignee: Suzhou Cmb Machinery Co ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-12-08
Anticipated expiration: 2030-03-06

Abstract

The utility model discloses a large casting local reinforced exhaust structure, which comprises an upper die arranged in a reverse butt joint manner, a plurality of cavities for forming castings arranged at the bottom of the upper die, a plurality of ladder-shaped sand core structures arranged on the upper die, an asbestos layer arranged on the surface of the sand core structures, and an exhaust column penetrating through the asbestos layer and the sand core structures; the exhaust column is located above the cavity, and the surface of the sand core structure is in interference fit with the asbestos layer. The utility model discloses a psammitolite is local effectively strengthened to exhaust.

Description

Local reinforced exhaust structure of large casting

Technical Field

The utility model belongs to the technical field of the foundry goods, especially, relate to an exhaust structure is strengthened to large-scale foundry goods part.

Background

Castings of complex shapes usually require sand cores to complete, but sand cores are required to be shaped and must be broken up after casting, so that a coupling agent (usually resin) is added, and the gas generated after the resin is burnt by molten iron during casting may remain in the molten iron to form blow hole defects. In the common process for avoiding the air holes in casting, the wall surface of a pouring system is used for air entrainment and is matched with a molten iron overflow column (process appearance) on the casting surface to discharge entrained air, but if the position relates to the precision critical dimension, the process is easily affected by a molding machine, a sand box, the precision of a mold, the precision of a tool and the like, so that the defect of the casting caused by sand extrusion due to poor matching is easily caused.

Large castings such as cylinder bodies and cylinder covers are limited in structure, a large number of sand cores are needed for molding, and the product is thin in wall, so that the defects are particularly prone to being bad.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem and providing large casting part reinforcing exhaust structure to realize the psammitolite part effectively reinforcing exhaust. In order to achieve the above purpose, the utility model discloses technical scheme as follows:

the large casting local strengthening exhaust structure comprises an upper die, a plurality of cavity of formed castings, a plurality of trapezoidal sand core structures, an asbestos layer and an exhaust column, wherein the upper die is arranged in a reverse butt joint mode, the cavity of the formed castings is arranged at the bottom of the upper die, the sand core structures are arranged on the upper die, the asbestos layer is arranged on the surface of the sand core structures, and the exhaust column penetrates through the asbestos layer and the sand core structures; the exhaust column is located above the cavity, and the surface of the sand core structure is in interference fit with the asbestos layer.

Specifically, the surface of the sand core structure is provided with an annular groove.

Specifically, the gap width of the groove is 0.5-1 mm.

Specifically, the asbestos layer and the groove are pressed and attached, and the thickness of the asbestos layer is larger than the depth of the groove.

Specifically, the exhaust column is located in the middle of the sand core structure and located in the center of the inner periphery of the groove.

Compared with the prior art, the utility model discloses large casting part strengthens exhaust structure's beneficial effect mainly embodies:

the asbestos layer is arranged on the sand core structure, so that the sand core structure has flexibility, and the requirement on the matching precision is lowered by arranging an interference fit mode; the high-temperature resistant alloy has high temperature resistance, and can bear the contact of high-temperature molten iron until solidification; the molten iron can not pass through the gas-permeable membrane due to surface tension, but gas can not be blocked, so that a gas one-way channel is formed; the sand core structure is matched with the asbestos layer and the exhaust column, and the defect of casting air holes is effectively avoided.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a single upper die in this embodiment;

the figures in the drawings represent:

1 upper die, 2 die cavities, 3 sand core structures, 31 grooves, 4 asbestos layers and 5 exhaust columns.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments.

Example (b):

referring to fig. 1-2, the present embodiment is a local reinforced exhaust structure for a large casting, and the structure includes an upper mold 1 disposed in a reverse butt joint manner, a plurality of mold cavities 2 for forming the casting disposed at the bottom of the upper mold 1, a plurality of stepped sand core structures 3 disposed on the upper mold 1, an asbestos layer 4 disposed on the surface of the sand core structures 3, and an exhaust column 5 penetrating through the asbestos layer 4 and the sand core structures 3; the exhaust column 5 is positioned above the cavity 2, and the surface of the sand core structure 3 is in interference fit with the asbestos layer 4.

The sand core structure 3 contains resin to form a ventilation layer connected with the cavity.

The surface of the sand core structure 3 is provided with an annular groove 31, and the gap width of the groove 31 is 0.5-1 mm.

Asbestos layer 4 compresses tightly the laminating setting with

recess

31, and 4 thickness on asbestos layer are greater than the recess 31 degree of depth, and asbestos layer 4 forms interference fit with recess 31.

The exhaust column 5 is located in the middle of the sand core structure 3 and in the center of the inner circumference of the groove 31.

When the sand core structure is applied, the asbestos layer 4 is arranged on the sand core structure 3, so that the sand core structure has flexibility, and the requirement on the matching precision is lowered by arranging an interference fit mode; the high-temperature resistant alloy has high temperature resistance, and can bear the contact of high-temperature molten iron until solidification; the molten iron can not pass through the gas-permeable membrane due to surface tension, but gas can not be blocked, so that a gas one-way channel is formed; the sand core structure 3 is matched with the asbestos layer 4 and the exhaust column 5, so that the defect of casting air holes is effectively avoided.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. Local exhaust structure of strengthening of large casting, its characterized in that: the device comprises an upper die, a plurality of cavities, a plurality of trapezoidal-shaped sand core structures, an asbestos layer and an exhaust column, wherein the upper die is reversely butted with the lower die, the cavities are arranged at the bottom of the upper die and used for forming castings, the sand core structures are arranged on the upper die and used for forming a plurality of trapezoidal-shaped sand cores, the asbestos layer is arranged on the surface of the sand core structures, and the exhaust column penetrates; the exhaust column is located above the cavity, and the surface of the sand core structure is in interference fit with the asbestos layer.

2. The locally reinforced venting structure of a large casting according to claim 1, wherein: and an annular groove is formed in the surface of the sand core structure.

3. The locally reinforced venting structure of a large casting according to claim 2, wherein: the gap width of the groove is 0.5-1 mm.

4. The locally reinforced venting structure of a large casting according to claim 2, wherein: the asbestos layer and the groove are pressed and attached, and the thickness of the asbestos layer is larger than the depth of the groove.

5. The locally reinforced venting structure of a large casting according to claim 2, wherein: the exhaust column is located in the middle of the sand core structure and is located in the center of the inner periphery of the groove.