阅读说明：本技术 定位支座本体低压模具 (Low-pressure die for positioning support body ) 是由 周本建 柯卫民 王爱铭 蒋绪东 陈伯君 员建玺 李大东 崔鑫 戴亿 王磊磊 殷涛 于 2021-11-04 设计创作，主要内容包括：本发明涉及模具领域,具体是一种定位支座本体低压模具,包括：模架；浇口杯,其固定在模架底部,并与模芯连通；模芯,其置于模架上,其侧面与模架具有热膨胀间隙,其底面与模架之间具有膨胀间隙；采用低压模具来实现定位支座的铸造成型,这样一来,通过浇口杯、浇道向模芯注入铝液,当充盈完成后,通过向冷却部位注入冷却气体,从而实现工件的冷却；这样生产处的工件能够减少疏松缩孔、热裂纹倾向的产生；实现了定位支座的铸造成型。(The invention relates to the field of dies, in particular to a low-pressure die for a positioning support body, which comprises: a mold frame; the sprue cup is fixed at the bottom of the die frame and is communicated with the die core; the mold core is arranged on the mold frame, a thermal expansion gap is formed between the side surface of the mold core and the mold frame, and an expansion gap is formed between the bottom surface of the mold core and the mold frame; the casting molding of the positioning support is realized by adopting a low-pressure die, so that aluminum liquid is injected into the die core through a pouring cup and a pouring channel, and after filling is finished, cooling gas is injected into a cooling part, so that the cooling of a workpiece is realized; the workpieces at the production position can reduce the generation of loose shrinkage cavity and hot cracking tendency; the casting molding of the positioning support is realized.)

1. Location support body low pressure mould, its characterized in that includes:

a mold frame;

the sprue cup is fixed at the bottom of the die frame and is communicated with the die core;

the mold core is arranged on the mold frame, a thermal expansion gap is formed between the side surface of the mold core and the mold frame, and an expansion gap is formed between the bottom surface of the mold core and the mold frame.

2. The low pressure die set of claim 1, wherein a liner tube is removably connected to the inside of the sprue cup;

the lining pipe is made of high-temperature-resistant heat-preservation ceramic materials.

3. The low-pressure die for the positioning support body as claimed in claim 1, wherein the die cores comprise an upper die core and a lower die core which are connected in an opening and closing manner;

the cross gate is arranged between the upper mold core and the lower mold core, and two thirds of the body of the cross gate is arranged in the upper mold core;

the upper mold core is also provided with a plurality of grooves.

4. The low-pressure die for positioning the support body as claimed in claim 3, wherein cooling air blowing ports are formed in the upper die core and the lower die core;

a blowing pipe inserted into the cooling blowing port and adapted to blow cold air into the cooling blowing port.

5. The localiser shoe body low pressure die as claimed in claim 4, wherein the blowpipe comprises: the first pipe body, the second pipe body and the third pipe body are sequentially communicated;

wherein the diameter of the first pipe body is smaller than that of the second pipe body; the second pipe body is provided with a plurality of hole bodies; the third pipe body is in a necking shape;

the end part of the third pipe body is inserted into the cooling air blowing port.

Technical Field

The invention relates to a casting die, in particular to a low-pressure die for a positioning support body.

Background

The positioning support is often applied to the railway industry, and the positioning support is often realized through a casting mold, but the existing casting mold is often realized through a gravity casting mode, namely a pouring gate is arranged above a mold frame, and the casting mode causes that the formed product is often loose and has shrinkage cavity and hot cracking tendency, and the product has poor structure performance.

In conclusion, how to realize the casting forming of the positioning support is a problem which needs to be solved urgently by researchers in the field.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: how to realize the casting molding of the positioning support;

in order to solve the technical problems, the invention adopts the following technical scheme:

the invention is a low pressure die of a positioning support body, comprising: a mold frame; the sprue cup is fixed at the bottom of the die frame and is communicated with the die core; the mold core is arranged on the mold frame, a thermal expansion gap is formed between the side surface of the mold core and the mold frame, and an expansion gap is formed between the bottom surface of the mold core and the mold frame;

in the scheme, the casting of the positioning support is realized by adopting a low-pressure die, so that aluminum liquid is injected into the die core through the pouring cup and the pouring channel, and after filling is finished, cooling gas is injected into a cooling part, so that the cooling of a workpiece is realized; the workpieces at the production position can reduce the generation of loose shrinkage cavity and hot cracking tendency;

the working temperature of the die is about 700 ℃, in order to ensure the matching relationship of the die core and the die carrier at high temperature, a thermal expansion gap of 0.33mm is reserved between the side surface of the die core and the contact surface of the die carrier, meanwhile, the plane of the die core is taken as a reference, the lower die frame is-0.2 mm, the middle block has 4 corners of-0.1 mm, the position of a sprue is-0.4 mm, the upper die frame is-0.2 mm, and the middle block is 0mm, so as to ensure the good matching between the die core and the die carrier at high temperature. And the mold core can be subjected to expansion deformation at high temperature, so that in the design process, the bottom surface of the mold core is not in complete contact with the mold base, and an expansion gap of 2-3 mm is reserved, so that the mold core has enough space to release expansion deformation, and the stability of the size of the cavity and the service life of the mold core are ensured.

In order to concretely explain the design of the pouring basin, the invention adopts the pouring basin to be detachably connected with a lining pipe; the lining pipe is made of high-temperature-resistant heat-preservation ceramic material;

because the pouring basin is always under the high-temperature aluminum liquid flushing of more than 700 ℃ in the whole casting and forming process, the pouring basin belongs to a vulnerable part, the pouring basin is designed to be detachable, and the lining (heat preservation cup) material of the pouring basin is made of high-temperature-resistant heat preservation ceramic, so that the chilling effect of the riser tube on the aluminum liquid is reduced, the heat preservation effect is improved, the temperature of the aluminum liquid is ensured to meet the process requirement, and meanwhile, the follow-up production maintenance and replacement are facilitated.

In order to ensure the stripping and demolding of a pouring system and a product, the invention adopts the mold core comprising an upper mold core and a lower mold core which are connected in an opening and closing manner; the cross gate is arranged between the upper mold core and the lower mold core, and two thirds of the body of the cross gate is arranged in the upper mold core; the upper mold core is also provided with a plurality of grooves;

the two-thirds of the body of a cross runner in a pouring system is designed in an upper mold core, and a plurality of grooves are added at the same time. (specifically, 3 square and 5 round) to increase the binding force of the gating system and the product with the upper die, and be convenient for the gating system and the product to lift and demould.

In order to rapidly cool a workpiece, the invention adopts the structure that the upper mold core and the lower mold core are provided with cooling air blowing ports; a blowing pipe inserted into the cooling blowing port and blowing cold air into the cooling blowing port;

cooling air is introduced into the blowing pipe from the cooling air blowing port through the workpiece, so that cooling can be accelerated, the cooling air is introduced into the blowing pipe, is combined with the air blown from the cooling air blowing port, is mixed from a gap between the cooling air blowing port and the blowing pipe, and is discharged into the air;

the mould core bottom surface and the mould base are not in complete contact, a gap of 3mm and a blowing pipe are reserved for matching, the cooling area is increased, the principle that a product keeps sequential solidification in the solidification process is guaranteed, the probability of loosening and shrinkage cavity is reduced, meanwhile, in order to improve the production efficiency, the cooling speed of a pouring system is accelerated, cooling blowing openings are arranged at two-thirds positions and one-third positions of four cross runners of the upper mould core respectively, and a second cooling blowing opening is arranged at a wind flow cone.

To illustrate the construction of the blowpipe, the present invention employs a blowpipe comprising: the first pipe body, the second pipe body and the third pipe body are sequentially communicated; wherein the diameter of the first pipe body is smaller than that of the second pipe body; the second pipe body is provided with a plurality of hole bodies; the third pipe body is in a necking shape; the third pipe body is inserted into the cooling air blowing port;

in this scheme, let in air conditioning from first body, discharge from hole body, third body tip afterwards, can effectual increase and cooling mouth of blowing blow off the wind and combine, improve cooling efficiency.

In order to ensure that the product is smoothly stripped and demoulded, the pattern drawing inclination of the pattern cavity of the upper mold core is increased from 2 degrees to 8 degrees, and the pattern drawing inclination of the outer pattern cavity is designed to be 3 degrees; the radius of the transition arc angle is increased from 2 mm-3 mm to 5 mm-8 mm; the corresponding boss position of cross gate sets up ejection rod, and the diameter of increase ejection rod to increase ejection mechanism's ejecting dynamics.

The invention has the beneficial effects that: the invention relates to a low-pressure die of a positioning support body, which is used for casting the positioning support, so that molten aluminum is injected into a die core through a pouring cup and a pouring channel, and cooling gas is injected into a cooling part after filling is finished, thereby cooling a workpiece; the workpieces at the production position can reduce the generation of loose shrinkage cavity and hot cracking tendency; the casting molding of the positioning support is realized.

Drawings

The invention is further illustrated with reference to the following figures and examples.

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

FIG. 2 is a schematic view of the mold core structure of the present invention;

FIG. 3 is a schematic view of the construction of a pouring cup;

FIG. 4 is a schematic structural view of the upper and lower mold cores;

FIG. 5 is a schematic structural view of the inner side of the upper die core;

FIG. 6 is a schematic top view of the upper die core of the present invention;

fig. 7 is a schematic view of a blowpipe configuration of the present invention;

in the figure: 1-mould frame, 2-pouring cup, 3-mould core, 4-thermal expansion gap, 5-expansion gap, 6-lining pipe, 7-upper mould core, 8-lower mould core, 9-cross channel, 10-groove, 11-cooling air blowing port, 12-first pipe body, 13-second pipe body, 14-third pipe body and 15-hole body.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1-2, the present invention is a low-pressure die for a positioning seat body, comprising: a mold frame 1; the sprue cup 2 is fixed at the bottom of the die carrier 1 and is communicated with the die core 3; the mold core 3 is arranged on the mold frame 1, a thermal expansion gap 4 is formed between the side surface of the mold core and the mold frame 1, and an expansion gap 5 is formed between the bottom surface of the mold core and the mold frame 1;

in the scheme, the casting of the positioning support is realized by adopting a low-pressure die, so that aluminum liquid is injected into the die core through the sprue cup and the pouring gate, and after filling is finished, cooling gas is injected into the sprue cup, so that the cooling of a workpiece is realized; the workpieces at the production position can reduce the generation of loose shrinkage cavity and hot cracking tendency;

the working temperature of the die is about 700 ℃, in order to ensure the matching relationship of the die core and the die carrier at high temperature, a thermal expansion gap of 0.33mm is reserved between the side surface of the die core and the contact surface of the die carrier, meanwhile, the plane of the die core is taken as a reference, the lower die frame is-0.2 mm, the middle block has 4 corners of-0.1 mm, the position of a sprue is-0.4 mm, the upper die frame is-0.2 mm, and the middle block is 0mm, so as to ensure the good matching between the die core and the die carrier at high temperature. And the mold core can be subjected to expansion deformation at high temperature, so that in the design process, the bottom surface of the mold core is not in complete contact with the mold base, and an expansion gap of 2-3 mm is reserved, so that the mold core has enough space to release expansion deformation, and the stability of the size of the cavity and the service life of the mold core are ensured.

As shown in FIG. 3, in order to explain the design of the pouring cup in detail, the invention adopts the pouring cup 2 to be detachably connected with a lining pipe 6; the lining pipe 6 is made of high-temperature-resistant heat-preservation ceramic material;

because the pouring basin is always under the high-temperature aluminum liquid flushing of more than 700 ℃ in the whole casting and forming process, the pouring basin belongs to a vulnerable part, the pouring basin is designed to be detachable, and the lining (heat preservation cup) material of the pouring basin is made of high-temperature-resistant heat preservation ceramic, so that the chilling effect of the riser tube on the aluminum liquid is reduced, the heat preservation effect is improved, the temperature of the aluminum liquid is ensured to meet the process requirement, and meanwhile, the follow-up production maintenance and replacement are facilitated.

As shown in fig. 4-5, in order to ensure the mold stripping and demolding of the pouring system and the product, the mold core 3 of the invention comprises an upper mold core 7 and a lower mold core 8 which are connected in an opening and closing manner; a cross gate which is arranged between the upper mold core 7 and the lower mold core 8, and two thirds of the body of the cross gate 9 is arranged in the upper mold core 7; the upper mold core 7 is also provided with a plurality of grooves 10;

the two-thirds of the body of a cross runner in a pouring system is designed in an upper mold core, and a plurality of grooves are added at the same time. (specifically, 3 square and 5 round) to increase the binding force of the gating system and the product with the upper die, and be convenient for the gating system and the product to lift and demould.

As shown in fig. 6-7, in order to rapidly cool the workpiece, the cooling air blowing ports 11 are formed on the upper mold core 7 and the lower mold core 8; a blowpipe inserted into the cooling blowhole 11 and blowing cold air into the cooling blowhole 11;

cooling air is introduced into the blowing pipe from the cooling air blowing port through the workpiece, so that cooling can be accelerated, the cooling air is introduced into the blowing pipe, is combined with the air blown from the cooling air blowing port, is mixed from a gap between the cooling air blowing port and the blowing pipe, and is discharged into the air;

the mould core bottom surface and the mould base are not in complete contact, a gap of 3mm and a blowing pipe are reserved for matching, the cooling area is increased, the principle that a product keeps sequential solidification in the solidification process is guaranteed, the probability of loosening and shrinkage cavity is reduced, meanwhile, in order to improve the production efficiency, the cooling speed of a pouring system is accelerated, cooling blowing openings are arranged at two-thirds positions and one-third positions of four cross runners of the upper mould core respectively, and a second cooling blowing opening is arranged at a wind flow cone.

As shown in fig. 7, in order to explain the structure of the blowpipe, the present invention employs a blowpipe including: the first tube body 12, the second tube body 13 and the third tube body 14 are sequentially communicated; wherein the diameter of the first tube 12 is smaller than the diameter of the second tube 13; the second pipe body 13 is provided with a plurality of hole bodies 15; the third tube 14 is in a necking shape; the third pipe 14 is inserted into the cooling air blowing port 11;

in this scheme, let in air conditioning from first body, discharge from hole body, third body tip afterwards, can effectual increase and cooling mouth of blowing blow off the wind and combine, improve cooling efficiency.

In order to ensure that the product is smoothly stripped and demoulded, the pattern drawing inclination of the pattern cavity of the upper mold core is increased from 2 degrees to 8 degrees, and the pattern drawing inclination of the outer pattern cavity is designed to be 3 degrees; the radius of the transition arc angle is increased from 2 mm-3 mm to 5 mm-8 mm; the corresponding boss position of cross gate sets up ejection rod, and the diameter of increase ejection rod to increase ejection mechanism's ejecting dynamics.

The invention relates to a low-pressure die of a positioning support body, which is used for casting the positioning support, so that molten aluminum is injected into a die core through a pouring cup and a pouring channel, and cooling gas is injected into a cooling part after filling is finished, thereby cooling a workpiece; the workpieces at the production position can reduce the generation of loose shrinkage cavity and hot cracking tendency; the casting molding of the positioning support is realized.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.