CN215356127U

CN215356127U - Exhaust structure of lower-pressure casting upper die for rear shell of aluminum alloy gearbox

Info

Publication number: CN215356127U
Application number: CN202121820267.7U
Authority: CN
Inventors: 王正军; 董长宇; 刘长森; 周利峰; 慕倩楠
Original assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Current assignee: Sinotruk Jinan Power Co Ltd; China National Heavy Duty Truck Group Jinan Power Co Ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2021-12-31
Anticipated expiration: 2031-08-05

Abstract

The utility model discloses an exhaust structure of an upper die for low-pressure casting of a rear shell of an aluminum alloy gearbox, which comprises the upper die, wherein exhaust grooves which are densely and alternately distributed are arranged in the inner cavity of the upper die at positions corresponding to the top surface of a casting, and exhaust plugs are distributed at intervals, and the exhaust grooves are alternately distributed in the upper die. The exhaust grooves which are densely and alternately distributed are arranged on the upper die, so that the exhaust capacity when the aluminum liquid is in contact with the cavity of the upper die is improved, the condition that the exhaust channel is blocked by unstable aluminum liquid when the aluminum liquid is filled is avoided, the exhaust capacity is improved, air holes and insufficient casting are reduced under the condition that the cleaning difficulty is not increased, and the exhaust grooves can be machined and removed in the subsequent machining procedures.

Description

Exhaust structure of lower-pressure casting upper die for rear shell of aluminum alloy gearbox

Technical Field

The utility model relates to an exhaust structure of an upper die for low-pressure casting of a rear shell of an aluminum alloy gearbox, and belongs to the technical field of casting.

Background

Aluminum alloy metal mold low-pressure casting is widely applied in China, and exhaust of metal mold low-pressure casting is one of the keys in the process. If the gas in the cavity is not discharged in time, the quality of the casting is affected. The casting mould needs to set up exhaust structure filling the mould end, causes the foundry goods defect when avoiding casting, and current exhaust mode mainly sets up core vent 3 or sets up die joint air discharge duct 4 at the die joint for filling the mould end. Because the aluminum liquid does not rise stably in the aluminum liquid filling process, the aluminum liquid which arrives first may be solidified first after contacting the upper die cavity, and the solidified part may block the exhaust path of the non-solidified part, resulting in unsmooth exhaust. The parting surface exhaust groove 4 mainly discharges gas when molten aluminum does not exceed a parting surface, when an upper die of a casting is provided with an inner cavity, if a nearby exhaust plug is not smooth in exhaust, air pocket can be generated on the local part of the top surface of the casting, and the gas can invade the casting to generate air holes or cause insufficient casting near the top surface.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an upper die exhaust structure for low-pressure casting of a rear shell of an aluminum alloy gearbox aiming at the defects in the prior art.

In order to solve the technical problem, the utility model provides an exhaust structure of an upper die for low-pressure casting of a rear shell of an aluminum alloy gearbox, which comprises the upper die, wherein exhaust grooves which are densely and alternately distributed are arranged in the inner cavity of the upper die at positions corresponding to the top surface of a casting, exhaust plugs are distributed at intervals, and the exhaust grooves are alternately distributed in the upper die.

The exhaust groove is formed by mutually perpendicular two groups of parallel grooves.

The depth of the exhaust groove is 1-2mm, and the width of the exhaust groove is 1-2 mm; the distance between the exhaust grooves is 5-10 mm.

The section of the exhaust groove is triangular, and the angle of the groove bottom is 90-120 degrees.

The depth of the exhaust grooves is 2mm, the width of the exhaust grooves is 2mm, and the distance between the exhaust grooves is 5 mm; the section of the exhaust groove 2 is triangular, and the included angle of the groove bottom is 90 degrees.

Has the advantages that: the exhaust grooves which are densely and alternately distributed are arranged on the upper die, so that the exhaust capacity when the aluminum liquid is in contact with the cavity of the upper die is improved, the condition that the exhaust channel is blocked by unstable aluminum liquid when the aluminum liquid is filled is avoided, the exhaust capacity is improved, air holes and insufficient casting are reduced under the condition that the cleaning difficulty is not increased, and the exhaust grooves can be machined and removed in the subsequent machining procedures.

Drawings

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

FIG. 2 is a schematic cross-sectional view A-A of FIG. 1 according to the present invention;

FIG. 3 is an enlarged view of the vent slot of the present invention.

In the figure: 1. an upper die; 2. an exhaust groove; 3. a vent plug; 4. parting surface exhaust groove.

Detailed Description

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

As shown in fig. 1 and 2, the utility model provides an exhaust structure of an upper die for low-pressure casting of a rear shell of an aluminum alloy gearbox, which comprises an upper die 1, exhaust grooves 2 which are densely and alternately distributed are arranged in the inner cavity of the upper die 1 at positions corresponding to the top surface of a casting, exhaust plugs 3 are distributed at intervals, and the exhaust grooves 2 are alternately distributed on the upper die 1.

The depth of the exhaust groove 2 is 1-2mm, and the width is 1-2 mm; the distance between the exhaust grooves is 5-10 mm.

The section of the exhaust groove 2 is triangular, and the angle of the groove bottom is 90-120 degrees.

The utility model has the advantages that: through set up the air discharge duct at last mould, with the exhaust plug cooperation exhaust, air discharge duct vertically and horizontally staggered distributes, has increased exhaust passage, avoids aluminium liquid thoroughly to block up exhaust passage, under the condition that does not increase the clearance degree of difficulty, has improved exhaust effect, can effectively reduce the gas pocket and the not enough defect of casting.

Examples

The embodiment discloses an upper die exhaust structure for low-pressure casting of a rear shell of an aluminum alloy gearbox, wherein staggered exhaust grooves 2 are arranged at the deepest part of an inner cavity of an upper die 1 and correspond to the top surface of a casting, and exhaust plugs 3 are distributed at intervals; the whole exhaust duct 2 is formed by mutually perpendicular two groups of parallel ducts, the depth of the exhaust duct 2 is 1.5mm, the width is 1.5mm, the distance is 5mm, the cross section is triangular, and the included angle of the exhaust duct is 90 degrees. The upper die exhaust structure of the embodiment avoids the condition that an exhaust channel is blocked by unstable aluminum liquid when the aluminum liquid is filled, and reduces the phenomena of air holes and insufficient casting.

The above-described embodiments of the utility model are intended to be illustrative only and are not intended to be limiting, as all changes that come within the scope of or equivalence to the utility model are intended to be embraced therein.

Claims

1. The utility model provides an aluminum alloy gearbox backshell low pressure casting goes up mould exhaust structure which characterized in that: the device comprises an upper die (1), wherein dense staggered exhaust grooves (2) are arranged in the inner cavity of the upper die (1) at positions corresponding to the top surface of a casting, exhaust plugs (3) are distributed at intervals, and the exhaust grooves (2) are distributed in the upper die (1) in a staggered manner.

2. The aluminum alloy gearbox backshell low pressure casting upper die exhaust structure of claim 1, wherein: the exhaust groove (2) is formed by mutually perpendicular two groups of parallel grooves.

3. The aluminum alloy gearbox backshell low pressure casting upper die exhaust structure of claim 1, wherein: the depth of the exhaust grooves (2) is 1-2mm, the width of the exhaust grooves is 1-2mm, and the distance between the exhaust grooves is 5-10 mm.

4. The aluminum alloy gearbox backshell low pressure casting upper die exhaust structure of claim 1, wherein: the section of the exhaust groove (2) is triangular, and the angle of the groove bottom is 90-120 degrees.

5. The aluminum alloy gearbox backshell low pressure casting upper die exhaust structure of any one of claims 1 to 4, wherein: the depth of the exhaust groove (2) is 1.5mm, and the width of the exhaust groove is 1.5 mm; the section of the exhaust groove (2) is triangular, and the included angle of the groove bottom is 90 degrees.