阅读说明：本技术 一种超长铝合金横梁低压铸造模具及其铸造方法 (Low-pressure casting die for ultra-long aluminum alloy beam and casting method thereof ) 是由 张炳荣 刘见向 胡振洋 潘锐 王致明 饶伟锋 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种超长铝合金横梁低压铸造模具,包括模具本体,所述模具本体由顶模、底模和两个侧模构成,所述底模内设置有砂芯,所述砂芯内部设置有钢管,砂芯表面经喷涂与烘烤处理,所述模具支架包括配重底板和竖板,所述竖板固定安装在配重底板上表面,竖板内侧表面上端安装有升降机构。本发明在砂芯内部添加钢管,并通过对砂芯表面进行喷涂与烘烤,能够很好的解决产品制造过程变形与发气问题,并有效解决产品表面质量差、生产效率低、产品废品率高等问题,铸件冷却后将砂芯震碎取出,模具支架移动方便,适用于不同尺寸的模具进行起模工作,提高了起模的效率,模具支架与模具之间拆卸安装方便,适用范围广。(The invention discloses a low-pressure casting die for an ultra-long aluminum alloy beam, which comprises a die body, wherein the die body consists of a top die, a bottom die and two side dies, a sand core is arranged in the bottom die, a steel pipe is arranged in the sand core, the surface of the sand core is subjected to spraying and baking treatment, a die support comprises a counterweight bottom plate and a vertical plate, the vertical plate is fixedly arranged on the upper surface of the counterweight bottom plate, and a lifting mechanism is arranged at the upper end of the inner side surface of the vertical plate. According to the invention, the steel pipe is added in the sand core, and the surface of the sand core is sprayed and baked, so that the problems of deformation and gas generation in the product manufacturing process can be solved well, and the problems of poor product surface quality, low production efficiency, high product rejection rate and the like can be solved effectively.)

1. The utility model provides an overlength aluminum alloy crossbeam low pressure casting mould, includes the mould body, the mould body comprises top mould, die block and two side moulds, be provided with the psammitolite in the die block, its characterized in that: the psammitolite is through the spraying and toast the processing, and the inside steel pipe that is provided with of psammitolite, the steel pipe link up in psammitolite both ends surface, and the through-hole has all been seted up to the steel pipe both ends outside that is located the psammitolite, all insert in the through-hole and be equipped with the pull rod, and the pull rod surface is located the steel pipe below and has seted up the screw hole, the screw hole is installed to the screw rod upper end link up in the top mould upper surface, the sprue gate has all been seted up at die block basal surface both ends, the two outsides of mould body all are provided with the mould support, the mould support includes counter weight bottom plate and riser, riser fixed mounting is at counter.

2. The ultra-long aluminum alloy beam low-pressure casting die of claim 1, wherein: elevating system includes backup pad, pneumatic cylinder and clamp sleeve, backup pad fixed mounting is in riser inboard surface upper end, pneumatic cylinder fixed mounting is in backup pad upper surface, and the piston rod activity of pneumatic cylinder runs through the backup pad lower surface, the clamp sleeve is located the piston rod lower extreme, and the clamp sleeve comprises two semicircle cardboard activity hinges, and the protrusion ring rib has all been seted up to clamp sleeve inboard surface upper and lower extreme, piston rod lower extreme surface and pull rod upper end surface all are seted up and have been had the annular groove, the clamp sleeve passes through protrusion ring rib and the ring groove block that corresponds the position and is connected the pull rod with the piston rod, and two semicircle cardboards of clamp sleeve pass through bolt fixed connection.

3. The ultra-long aluminum alloy beam low-pressure casting die of claim 1, wherein: and the inner side surface of the side die is provided with a limiting opening corresponding to the position of the steel pipe, and the cross section size of the limiting opening corresponds to that of the steel pipe.

4. The ultra-long aluminum alloy beam low-pressure casting die of claim 1, wherein: and the bottom surface of the counterweight bottom plate is provided with a roller.

5. The ultra-long aluminum alloy beam low-pressure casting die as claimed in claim 1 or 3, wherein: the top die, the bottom die and the side die are all steel structures.

6. The casting method of the ultra-long aluminum alloy beam low-pressure casting die according to any one of claims 1 to 5, characterized by comprising the following steps:

firstly, when a mould is closed, closing two side moulds at two ends of a bottom mould, and closing a top mould after a sand core is processed through a limiting opening;

connecting a mold support, and fixedly connecting a pull rod with a piston rod of a hydraulic cylinder through a clamp sleeve;

step three: casting, namely connecting a pouring port with a liquid outlet of aluminum alloy liquid outlet equipment, slowly increasing the pressure, allowing aluminum liquid to enter a cavity of a mold body through the pouring port, slowly increasing the pressure to slowly fill the cavity with the aluminum liquid through an internal pouring channel, then quickly increasing the pressure, and releasing the pressure after pressure maintaining and cooling for a period of time;

step four: and opening the die, starting the hydraulic cylinder, retracting the piston rod through the hydraulic cylinder to lift the top die to a proper height, opening the side die, continuously lifting the top die, and taking out the casting.

7. The casting method of the ultra-long aluminum alloy beam low-pressure casting mold as recited in claim 6, wherein: in the third step, the pressure is slowly raised for 15-20s, the pressure is raised to 0.04-0.05Mpa, the pressure is rapidly raised for 3-5s, the pressure is raised to 0.06-0.07 Mpa, and the pressure is maintained and cooled for a period of 300-500 s.

8. The casting method of a casting mold according to claim 6 or 7, characterized in that: the temperature of the aluminum liquid in the third step is controlled to be 720-730 ℃.

Technical Field

The invention relates to the technical field of aluminum alloy casting, in particular to a low-pressure casting die for an ultra-long aluminum alloy beam and a casting method thereof.

Background

With the increasing requirements of energy conservation and emission reduction and new and old kinetic energy conversion, the aluminum alloy has wide application in the field of industrial product manufacturing due to a series of advantages of light weight, high specific strength, oxidation and corrosion resistance and the like. The aluminum alloy beam is a mechanical equipment rail bearing part and is also a core part, the traditional beam is made of cast iron and is easy to corrode, particularly has heavy weight, high energy consumption in the product operation process is caused to a great extent, and the production process is the traditional wood pattern sand casting process and the gravity casting process, so that the production efficiency is low, the product surface quality is poor, the qualification rate is low, and the cost is high.

Because the length of the beam product is relatively long, and the common product is more than 2 meters, the product is easy to deform in the production process, particularly in the production process of using the traditional wood pattern sand casting and gravity casting technology, the product manufacturing difficulty is high, the rejection rate is high, the waste to a great extent is caused, and the existing stripping device of the low-pressure casting die has the defects of difficult stripping, incapability of adjusting according to dies with different sizes and wide application range.

Disclosure of Invention

The invention aims to provide a low-pressure casting die for an ultra-long aluminum alloy beam and a casting method thereof, wherein the low-pressure casting die has the advantages of high product yield, production efficiency improvement and good product quality.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a low-pressure casting die for an ultra-long aluminum alloy beam comprises a die body, wherein the die body consists of a top die, a bottom die and two side dies, a sand core is arranged in the bottom die and is subjected to spraying and baking treatment, a steel pipe is arranged in the sand core and penetrates through the surfaces of the two ends of the sand core, through holes are formed in the two ends of the steel pipe, which are positioned outside the sand core, pull rods are inserted into the through holes, threaded holes are formed in the surfaces of the pull rods below the steel pipes, screws are installed in the threaded holes, the upper end of the pull rod is communicated with the upper surface of the top die, two ends of the bottom surface of the bottom die are both provided with pouring gates, the two outer sides of the mould body are respectively provided with a mould bracket, the mould bracket comprises a counterweight bottom plate and a vertical plate, the vertical plate is fixedly installed on the upper surface of the counterweight bottom plate, the lifting mechanism is installed at the upper end of the inner side surface of the vertical plate, and the upper end of the pull rod is connected with the lifting mechanism.

Preferably, elevating system includes backup pad, pneumatic cylinder and clamp sleeve, backup pad fixed mounting is in riser inboard surface upper end, pneumatic cylinder fixed mounting is in backup pad upper surface, and the piston rod activity of pneumatic cylinder runs through the backup pad lower surface, the clamp sleeve is located the piston rod lower extreme, and the clamp sleeve comprises two semicircle cardboard activity hinge joints, and protruding annular rib has all been seted up to clamp sleeve inboard surface upper and lower extreme, piston rod lower extreme surface and pull rod upper end surface all are seted up and have been had the annular groove, the clamp sleeve passes through protruding annular rib and the annular groove block that corresponds the position and is connected the pull rod with the piston rod, and two semicircle cardboards of clamp sleeve pass through bolt fixed connection.

Preferably, the inner side surface of the side die is provided with a limiting opening corresponding to the position of the steel pipe, and the cross-sectional dimension of the limiting opening corresponds to the cross-sectional dimension of the steel pipe.

Preferably, the bottom surface of the counterweight bottom plate is provided with a roller.

Preferably, the top die, the bottom die and the side die are all steel structures.

The casting method of the low-pressure casting die for the ultra-long aluminum alloy beam comprises the following steps of:

firstly, when a mould is closed, closing two side moulds at two ends of a bottom mould, and closing a top mould after a sand core is processed through a limiting opening;

connecting a mold support, and fixedly connecting a pull rod with a piston rod of a hydraulic cylinder through a clamp sleeve;

step three: casting, namely connecting a pouring port with a liquid outlet of aluminum alloy liquid outlet equipment, slowly increasing the pressure, allowing aluminum liquid to enter a cavity of a mold body through the pouring port, slowly increasing the pressure to slowly fill the cavity with the aluminum liquid through an internal pouring channel, then quickly increasing the pressure, and releasing the pressure after pressure maintaining and cooling for a period of time;

step four: and opening the die, starting the hydraulic cylinder, retracting the piston rod through the hydraulic cylinder to lift the top die to a proper height, opening the side die, continuously lifting the top die, and taking out the casting.

Preferably, the time for slowly raising the pressure in the third step is 15-20s, the time for raising the pressure is 0.04-0.05MPa, the time for rapidly raising the pressure is 3-5s, the time for raising the pressure is 0.06-0.07 MPa, and the pressure maintaining and cooling are carried out for 500s at 300-.

Preferably, the temperature of the aluminum liquid in the third step is controlled to be 720-730 ℃.

Compared with the prior art, the invention has the advantages that:

according to the low-pressure casting die and the casting method thereof for the ultra-long aluminum alloy beam, the steel pipe is added into the sand core, and the sand core is sprayed and baked, so that the deformation problem in the manufacturing process and the heat treatment process of a product can be well solved, the problems of poor surface quality, low production efficiency, high product rejection rate and the like of the product are effectively solved, after the casting is cooled, the sand core can be shattered by shaking the steel pipe, the casting is convenient to take out, the die support is convenient to move, the die support is suitable for performing die lifting work on dies with different sizes, the die lifting efficiency is improved, the die support and the die are convenient to disassemble and install, and the application range is wide;

compared with the traditional wood pattern founding process and gravity casting process, the invention effectively reduces the use of resin high-pollution products, reduces the weight and the processing allowance of the products, and has stronger energy-saving, consumption-reducing and environmental-protection benefits.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a structural diagram of a low-pressure casting mold for an ultra-long aluminum alloy beam according to the invention;

FIG. 2 is an exploded view of the die body of the present invention;

FIG. 3 is a cross-sectional view of the die body of the present invention;

fig. 4 is an enlarged schematic view of the structure at a in fig. 3.

In the figure: 100 mould bodies, 110 top moulds, 120 bottom moulds, 121 pouring gates, 130 side moulds, 131 limiting ports, 140 sand cores, 141 steel pipes, 142 pull rods, 143 screws, 144 through holes, 200 mould supports, 210 counterweight bottom plates, 220 rollers, 230 risers, 240 supporting plates, 250 hydraulic cylinders, 260 piston rods, 261 ring grooves, 270 clamping sleeve and 271 protruding ring ribs.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.

Referring to fig. 1-4, the invention provides a low-pressure casting mold for an ultra-long aluminum alloy beam, which comprises a mold body 100, wherein the mold body 100 is composed of a top mold 110, a bottom mold 120 and two side molds 130, a sand core 140 is arranged in the bottom mold 120, the sand core 140 is subjected to spraying and baking treatment, a spraying material is a graphite water-based coating, and baking treatment is performed after spraying, so that the problems of deformation and gas generation in the manufacturing process of a product can be well solved, the sand core 140 is of a resin sand structure, a steel pipe 141 is arranged in the sand core 140, the steel pipe 141 penetrates through the surfaces of the two ends of the sand core 140, through holes 144 are formed in the two ends of the steel pipe 141, a pull rod 142 is inserted into the through holes 144, threaded holes are formed in the surface of the pull rod 142 below the steel pipe 141, screws 143 are arranged in the threaded holes, the upper ends of the, the two outer sides of the die body 100 are provided with die supports 200, each die support 200 comprises a counterweight bottom plate 210 and a vertical plate 230, each vertical plate 230 is fixedly installed on the upper surface of the counterweight bottom plate 210, the upper ends of the inner side surfaces of the vertical plates 230 are provided with lifting mechanisms, and the upper ends of the pull rods 142 are connected with the lifting mechanisms.

In this embodiment, elevating system includes backup pad 240, pneumatic cylinder 250 and clamp sleeve 270, backup pad 240 fixed mounting is in riser 230 inboard surface upper end, pneumatic cylinder 250 fixed mounting is in backup pad 240 upper surface, the piston rod 260 activity of pneumatic cylinder 250 runs through backup pad 240 lower surface, clamp sleeve 270 is located the piston rod 260 lower extreme, clamp sleeve 270 comprises two semicircle cardboard activity hinge joints, protruding annular rib 271 has all been seted up to clamp sleeve 270 inboard surface upper and lower extreme, piston rod 260 lower extreme surface and pull rod 142 upper end surface all are seted up annular groove 261, clamp sleeve 270 passes through protruding annular rib 271 and the ring groove 261 block that corresponds the position and is connected pull rod 142 with piston rod 260, two semicircle cardboards of clamp sleeve 20 pass through bolt fixed connection, this connected mode dismantles simply.

In this embodiment, the inner surface of the side mold 130 is provided with a limiting opening 131 corresponding to the steel tube 141, the cross-sectional dimension of the limiting opening 131 corresponds to the cross-sectional dimension of the steel tube 141, and the limiting opening 131 can fix the steel tube 141 in the mold body 100.

In this embodiment, the roller 220 is installed on the bottom surface of the counterweight bottom plate 210, so as to facilitate moving the mold holder 200.

In this embodiment, the top mold 110, the bottom mold 120, and the side mold 130 are all made of steel.

According to the casting method of the ultra-long aluminum alloy beam low-pressure casting die,