CN110871261A - Air flue sand core mold process for automobile engine cylinder cover - Google Patents

Abstract

An air flue sand core casting mould is characterized in that an exhaust sheet is arranged in an exhaust bushing and is in clearance fit and replaceable; the exhaust bushing is placed in a mounting groove which is processed in advance in the lower core box, is fixed by screws and is easy to replace. The exhaust sheet is made of stainless steel and is 1.5mm thick, an exhaust groove of 0.2-0.3 mm is cut in a laser cutting mode, and the exhaust groove is cut around a center of a concentric circle with a mandril hole. The exhaust bushing and the exhaust sheet are slightly larger than the bottom of the air flue sand core claw, so that the distributed exhaust grooves can contain the bottom of the whole sand core claw, and the exhaust area is maximized.

Description

Air flue sand core mold process for automobile engine cylinder cover

Technical Field

The invention relates to an air flue sand core casting die, and belongs to the field of machine manufacturing.

Background

Sand casting is a casting which is made by using a mould and other process equipment to make a 'sand mould', filling liquid metal into the sand mould, and cooling to obtain the casting. Compared with other dies, the die is more complex, and extremely complex products such as engine cylinder covers and the like can be produced.

The air passage of the engine cylinder cover of the automobile is a key place of the engine cylinder cover. The cylinder cover air flue sand core is used for forming the shape. The air claw of the air passage sand core of the engine cylinder cover is irregular and long in shape, so that the conditions of looseness and untimely sand shooting are frequently generated in the core making process of the air passage sand core. The general exhaust mode is that add the gas plug or draw the exhaust groove on the ejector pin, the not enough condition that the psammitolite quality is unstable often appears at the core manufacturing in-process of exhausting, and can appear gas plug and exhaust groove jam and lead to the psammitolite to produce the defect for a long time not having produced, must often clear up, causes the frock availability factor low, and the clearance work is heavy.

Disclosure of Invention

The invention aims to solve the technical problem of providing a manufacturing process of an air flue sand core casting mould.

In order to solve the technical problem, the invention is realized as follows:

an air flue sand core casting die comprises a bottom frame (1), a lower top core plate (2), a lower top core rod (3), a lower fixing plate (4), a lower core box (5), an exhaust bushing (6) and an exhaust sheet (7);

the lower top core plate (2) is fixed with the lower top core rod (3), the lower top core plate (2) integrally falls into the bottom frame (1) and is arranged on a bottom frame supporting plate, and the lower fixing plate (4) is fixed on the bottom frame (1); the exhaust sheet (7) is arranged in the exhaust bushing (6), and the exhaust bushing (6) is fixed in a groove of the lower core box (5); the lower core box (5) is fixed on the lower fixing plate (4);

the exhaust grooves on the exhaust fins (7) are 0.2-0.3 mm; the fit clearance between the hole on the exhaust bushing (6) and the lower ejector core rod (3) is 0.2 mm; the exhaust bushing (6) is provided with a shakeout hollowed hole and an exhaust space between the exhaust bushing and the exhaust sheet (7); and a gap of 0.1-0.2 mm is formed between the exhaust sheet (7) and the inner surface of the groove of the lower core box (5).

The invention has the positive effects that: the device can produce compact and complete air flue sand cores, improves the characteristics of easy blockage and unsmooth exhaust effect of the existing exhaust mode, reduces the cleaning frequency of mould exhaust, reduces the cleaning burden and improves the use efficiency of the tool.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of the lower ejector pin, exhaust plate and exhaust groove assembly;

FIG. 3 is a schematic view of the lower ejector core rod, the exhaust plate and the exhaust groove;

wherein: 1-bottom frame, 2-lower top core plate, 3-lower top core rod 4-lower fixed plate, 5-lower core box, 6-exhaust bushing and 7-exhaust sheet.

Detailed Description

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

As shown in fig. 1-3, the air flue sand core casting mold comprises a bottom frame 1, a lower top core plate 2, a lower top core rod 3, a lower fixing plate 4, a lower core box 5, an exhaust bushing 6 and an exhaust sheet 7.

The lower top core plate 2 is fixed with the lower top core rod 3, the lower top core plate 2 falls into the bottom frame 1 integrally and is placed on a bottom frame supporting plate, and the lower fixing plate 4 is fixed on the bottom frame 1; the exhaust sheet 7 is placed in the exhaust bush 6 and is installed and fixed in the groove of the lower core box 5; the lower core box 5 is fixed on the lower fixing plate 4.

The exhaust grooves on the exhaust fins 7 are 0.2-0.3 mm; the fit clearance between the hole on the exhaust bushing 6 and the lower core rod 3 is 0.2 mm; the exhaust bush 6 is provided with a shakeout hollowed hole and an exhaust space between the exhaust bush and the exhaust sheet 7; the exhaust sheet 7 is arranged on the exhaust sheet bushing 6 and then arranged in the lower core box groove, and at the moment, a gap of 0.1-0.2 mm is formed between the exhaust sheet 7 and the inner surface of the lower core box 5 groove.

The invention has the following positive effects: compared with the common exhaust plug or exhaust groove added on the lower ejection core rod, the exhaust device has the advantages that the exhaust area can be maximized, the exhaust effect is optimal, and the blockage is not easy to occur. Only the exhaust sheet needs to be replaced during replacement, the cost is low, the service life is long, and the cleaning is easier.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims (1)

1. The utility model provides an air flue psammitolite casting mould which characterized in that: the device comprises a bottom frame (1), a lower top core plate (2), a lower top core rod (3), a lower fixing plate (4), a lower core box (5), an exhaust bushing (6) and an exhaust sheet (7);

the lower top core plate (2) is fixed with the lower top core rod (3), the lower top core plate (2) integrally falls into the bottom frame (1) and is arranged on a bottom frame supporting plate, and the lower fixing plate (4) is fixed on the bottom frame (1); the exhaust sheet (7) is arranged in the exhaust bushing (6), and the exhaust bushing (6) is fixed in a groove of the lower core box (5); the lower core box (5) is fixed on the lower fixing plate (4);

the exhaust grooves on the exhaust fins (7) are 0.2-0.3 mm; the fit clearance between the hole on the exhaust bushing (6) and the lower ejector core rod (3) is 0.2 mm; the exhaust bushing (6) is provided with a shakeout hollowed hole and an exhaust space between the exhaust bushing and the exhaust sheet (7); and a gap of 0.1-0.2 mm is formed between the exhaust sheet (7) and the inner surface of the groove of the lower core box (5).

Images