阅读说明：本技术 铝合金壳体类铸件低压或差压铸造串铸装置及其串铸方法 (Low-pressure or differential-pressure casting series casting device and method for aluminum alloy shell castings ) 是由 宋文清 赵小梅 任广笑 李沛森 马二波 赵盼 于 2021-08-20 设计创作，主要内容包括：本发明属于铝合金件低压或差压铸造技术领域,具体涉及一种铝合金壳体类铸件低压或差压铸造串铸装置及其串铸方法。该铝合金壳体类铸件低压或差压铸造串铸装置,包括自下而上放置的底型、下型、至少两个中型、至少一个过渡型、上型,其中过渡型位于相邻的两个中型之间；底型、下型、中型、过渡型以及上型共同构成浇注腔,铝合金壳体类铸件成型于中型上。本发明实现了低压或差压铸造设备一炉次铸造两件以上的铝合金壳体类铸件,解决了现有低压或差压铸造一炉次只铸造一件壳体而导致的铸造出品率低、成本高、效率低的问题。(The invention belongs to the technical field of low-pressure or differential-pressure casting of aluminum alloy parts, and particularly relates to a low-pressure or differential-pressure casting series casting device and a series casting method for aluminum alloy shell castings. The low-pressure or differential pressure casting series casting device for the aluminum alloy shell castings comprises a bottom mold, a lower mold, at least two middle molds, at least one transition mold and an upper mold which are arranged from bottom to top, wherein the transition mold is positioned between the two adjacent middle molds; the bottom mold, the lower mold, the middle mold, the transition mold and the upper mold form a pouring cavity together, and the aluminum alloy shell type casting is formed on the middle mold. The invention realizes that the low-pressure or counter-pressure casting equipment casts more than two aluminum alloy shell castings in one heat, and solves the problems of low casting yield, high cost and low efficiency caused by casting only one shell in one heat in the existing low-pressure or counter-pressure casting.)

1. Aluminum alloy housing class foundry goods low pressure or counter-pressure casting cluster casting device, its characterized in that includes:

the bottom mold is provided with a straight pouring channel and a horizontal pouring channel; the sprue vertically penetrates through the bottom mold, and the bottom end of the sprue is connected with a liquid lifting pipe of low-pressure or differential pressure casting equipment; the horizontal pouring gate is circumferentially arranged at the periphery of the straight pouring gate, is concavely arranged on the top surface of the bottom mould, and is communicated with the straight pouring gate;

the lower die is positioned on the top surface of the bottom die and provided with a plurality of ingates, the ingates vertically penetrate through the lower die and are communicated with the transverse runners;

the middle section is positioned on the top surface of the lower section, gap runners which are in one-to-one correspondence with the inner runners and are communicated with the inner runners are arranged in the middle section, and the gap runners vertically penetrate through the middle section;

the transition type is positioned between two adjacent middle types, series pouring channels which are in one-to-one correspondence and are communicated with the gap pouring channels are arranged in the transition type, and the series pouring channels vertically penetrate through the transition type;

the upper mold is positioned on the middle-sized top surface of the uppermost layer, and the bottom surface of the upper mold is provided with blind risers which are in one-to-one correspondence with the gap runners and are communicated with the gap runners;

the bottom mold, the lower mold, the middle mold, the transition mold and the upper mold form a pouring cavity together, and the middle mold is used for forming aluminum alloy shell castings.

2. The low-pressure or differential-pressure casting and string casting device for the aluminum alloy shell castings according to claim 1, wherein the top surface of the upper mold is provided with vent holes which are in one-to-one correspondence and communication with the blind risers.

3. The low pressure or differential pressure casting string casting device for the aluminum alloy shell type castings according to any one of claims 1 or 2, wherein the bottom mold, the middle mold, the transition mold and the top mold are all sand molds.

4. The low-pressure or differential-pressure casting string casting device for the aluminum alloy shell castings according to claim 3, wherein a sand core is arranged in the middle section, and a core frame is vertically arranged in the sand core.

5. The low pressure or differential pressure casting series casting device for the aluminum alloy shell castings according to claim 3, wherein a plurality of chills are arranged in the middle-size for improving the forming quality of the aluminum alloy shell castings.

6. The method for the series casting of the low-pressure or differential-pressure casting series casting device of the aluminum alloy shell type casting according to any one of claims 1 to 5, is characterized by comprising the following steps of:

a molding step for manufacturing the bottom mold, the lower mold, the transition mold, the upper mold and the middle-sized outer cavity;

a core making step for making the medium-sized sand core;

combining all the sand moulds together and tightly connecting all the box bodies to form the low-pressure or differential-pressure casting series casting device for the aluminum alloy shell castings;

and a pouring step, namely pouring the aluminum alloy shell type casting low-pressure or differential pressure casting serial casting device through low-pressure or differential pressure casting equipment, and performing boxing and cleaning after solidification to obtain a plurality of aluminum alloy shell type castings at one time.

7. The method for casting the aluminum alloy shell casting in series through low pressure or differential pressure casting according to claim 6, wherein the bottom mold, the at least two middle molds, the at least one transition mold and the upper mold are placed from bottom to top in the mold assembling step to form a series for casting more than two aluminum alloy shell castings at one time.

8. The method for the series casting of the low-pressure or differential-pressure casting series casting device of the aluminum alloy shell type casting according to claim 6, wherein in the core making step, a core box is fixed, an upper end frame chilling block and a lower end frame chilling block are placed, a core frame is placed, and then the core box is filled with sand, tamped and opened; the core box is mainly formed by combining two half core boxes.

9. The method for the series casting of the low-pressure or differential-pressure casting device of the aluminum alloy shell castings according to claim 6, wherein in the molding step, when the middle-sized outer cavity is manufactured, the shell mold and the mold of the gap runner are fixed, the shape forming chill is placed, the middle box is placed, and then the sand filling and the tamping are carried out.

10. The method for casting the aluminum alloy shell type casting through the series casting device in the low-pressure or differential pressure casting manner according to claim 6, wherein in the molding step, a blind riser model is fixed, an upper box is placed, and then sand filling, tamping and box overturning are carried out; and pricking the vent hole at the top and the upper part of the blind riser by using an air eye needle.

Technical Field

The invention belongs to the technical field of low-pressure or differential-pressure casting of aluminum alloy parts, and particularly relates to a low-pressure or differential-pressure casting series casting device and a series casting method for aluminum alloy shell castings.

Background

The low-pressure casting is a casting method in which liquid metal is pressed into a casting mold cavity from bottom to top under the action of pressure and is solidified under the action of pressure to obtain a casting. The principle is as follows: compressed air is introduced into the sealed crucible, and molten metal is filled into the casting mold stably from bottom to top along the riser tube under the action of pressure through the pouring gate. When the casting is completely solidified, the gas pressure on the liquid surface is released, so that the metal liquid which is not solidified in the riser tube and the pouring gate flows back to the crucible by the self weight, then the casting mould is opened, and the casting is taken out.

Counter-pressure casting is a process method in which liquid metal is filled into a mold with a certain pressure in advance under the action of differential pressure, and crystallization and solidification are carried out to obtain a casting. The methods of differential pressure casting press difference generation are classified into a pressurization method and a depressurization method.

A pressurization method: dry compressed air enters an upper pressure cylinder and a lower pressure cylinder which are communicated with each other, and when the pressure value which meets the process requirement is reached, an air inlet valve is closed; at the moment, the pressures of the upper cylinder and the lower cylinder are balanced, and the molten metal in the crucible is also in a balanced state; then closing the upper and lower barrel intercommunicating valve to isolate the upper and lower barrels; opening an inflation valve of the lower barrel to increase the pressure of the lower barrel to generate pressure difference; under the action of pressure difference, molten metal in the crucible enters the cavity along the riser tube; after the mold filling is finished, when the pressure is continuously increased by inflation to meet the requirement of the process pressure maintaining value, the air inlet valve is closed, and the air inlet valve is kept for a period of time, so that the casting is crystallized and solidified under higher pressure; after the casting is completely solidified, the upper and lower cylinders are opened to release gas, and the unsolidified metal liquid flows back to the crucible by self-weight.

A decompression method: the working principle of the pressure reduction method is the same as that of the pressurization method in the inflation stage; the difference is that the exhaust valve of the upper cylinder is opened to reduce the pressure of the upper cylinder, so that the upper cylinder and the lower cylinder generate pressure difference; under the action of pressure difference, molten metal in the crucible enters the cavity along the riser tube; after the mold filling is finished, the valve is closed and kept for a period of time, after the casting is completely solidified, the valve and the exhaust valve which are communicated with the upper barrel and the lower barrel are opened, so that the upper barrel and the lower barrel are simultaneously deflated, and the unsolidified molten metal in the riser tube flows back to the crucible by the self weight.

The casting is crystallized and solidified under higher pressure, so that the crystal grains are fine, the feeding capacity is improved, the gas in molten metal is inhibited from being separated out, the porosity and pinholes are greatly reduced, and the casting with higher density can be obtained.

In the field of low-pressure or counter-pressure casting of aluminum alloy parts, only one shell is cast for one heat in the general low-pressure or counter-pressure casting process; for casting small-sized shell castings, the casting yield is low, so that the casting process has the problems of high cost and low efficiency.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a low-pressure or counter-pressure casting series casting device and a series casting method for aluminum alloy shell castings, and aims to solve the problems of low casting yield, high cost and low efficiency caused by casting only one shell in a one-time low-pressure or counter-pressure casting process.

The invention provides a low-pressure or differential pressure casting series casting device for aluminum alloy shell castings, which comprises:

the bottom mold is provided with a straight pouring channel and a cross pouring channel; the bottom end of the straight pouring gate is connected with a liquid lifting pipe of low-pressure or differential pressure casting equipment; the horizontal pouring gate is circumferentially arranged at the periphery of the straight pouring gate and is concavely arranged on the top surface of the bottom mould, and the horizontal pouring gate is communicated with the straight pouring gate;

the lower die is positioned on the top surface of the bottom die and is provided with a plurality of ingates, the ingates vertically penetrate through the lower die and are communicated with the cross gates;

the middle section is positioned on the top surface of the lower section, gap runners which are in one-to-one correspondence with the inner runners and are communicated with the inner runners are arranged in the middle section, and the gap runners vertically run through the middle section;

the transition type is positioned between two adjacent middle-sized gates, a series connection gate which is in one-to-one correspondence with the gap gate and is communicated with the gap gate is arranged in the transition type, and the series connection gate is vertically communicated with the transition type;

the upper mold is positioned on the middle-sized top surface of the uppermost layer, and the bottom surface of the upper mold is provided with blind risers which are in one-to-one correspondence with the gap runners and are communicated with the gap runners;

the bottom mould, the lower mould, the middle mould, the transition mould and the upper mould form a pouring cavity together, and the middle mould is used for forming the aluminum alloy shell type casting.

According to the technical scheme, the transition type is arranged, the superposition and the communication of a plurality of medium-sized castings on the height are realized, further, the casting of more than two aluminum alloy shell castings by low-pressure or differential pressure casting equipment at one time is realized, and the problems of low casting yield, high cost and low efficiency caused by the fact that only one shell is cast at one time by the existing low-pressure or differential pressure casting are solved.

In some embodiments, the top surface of the upper mold is provided with vent holes which are in one-to-one correspondence and communication with the blind risers. The technical scheme prevents the phenomenon of air entrainment or insufficient casting at the top of the casting, and improves the feeding effect of the blind riser.

In some of these embodiments, the bottom, middle, transition, and top molds are sand molds.

In some embodiments, a sand core is disposed within the medium, and a core frame is disposed vertically within the interior of the sand core. This technical scheme has strengthened the overall structure intensity of psammitolite.

In some embodiments, a plurality of chills for improving the forming quality of the aluminum alloy shell castings are arranged in the middle-sized mold.

The invention also provides a series casting method of the low-pressure or differential pressure casting series casting device for the aluminum alloy shell castings, which comprises the following steps:

a molding step, namely manufacturing bottom type, lower type, transition type, upper type and middle type external cavities;

a core making step, namely making a medium-sized sand core;

combining all sand moulds together and tightly connecting all the box bodies to form the low-pressure or differential pressure casting series casting device for the aluminum alloy shell type castings;

and a pouring step, namely pouring the aluminum alloy shell type casting low-pressure or differential pressure casting serial casting device through low-pressure or differential pressure casting equipment, and performing boxing and cleaning after solidification to obtain a plurality of aluminum alloy shell type castings at one time.

The technical scheme realizes the manufacture of the low-pressure or differential-pressure casting series casting device for the aluminum alloy shell castings, and realizes the casting of a plurality of aluminum alloy shell castings at one time.

In some embodiments, in the mold assembly step, a bottom mold, a lower mold, at least two middle molds, at least one transition mold and an upper mold are placed from bottom to top to form a cluster for casting more than two aluminum alloy shell castings at one time.

In some embodiments, in the core making step, a core box is fixed, an upper end frame chilling block and a lower end frame chilling block are placed, a core frame is placed, and then sand filling, tamping and opening of the core box are carried out; the core box is mainly formed by combining two half core boxes.

In some embodiments, in the molding step, when the middle-sized outer cavity is manufactured, the shell mold and the mold of the gap pouring channel are fixed, the shape forming chilling block is placed, the middle box is placed, and then sand filling and tamping are carried out.

In some embodiments, in the molding step, when the upper mold is manufactured, a blind riser mold is fixed, a box is placed, and then sand filling, tamping and box turning are carried out; and pricking the vent hole at the top and the upper part of the blind riser by using an air eye needle.

Based on the technical scheme, the low-pressure or differential-pressure casting series casting device and the series casting method for the aluminum alloy shell castings in the embodiment of the invention realize that more than two aluminum alloy shell castings are cast by low-pressure or differential-pressure casting equipment at one time, and solve the problems of low casting yield, high cost and low efficiency caused by casting only one shell at one time by low-pressure or differential-pressure casting at one time.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a low-pressure or differential-pressure casting series casting device for aluminum alloy shell castings according to the present invention;

fig. 2 is a sectional view a-a of fig. 1.

In the figure:

1. a bottom form; 2. a sprue; 3. a cross gate; 4. a filter screen; 5. molding; 6. an inner pouring channel; 7. a cold iron of a lower end frame; 8. a gap pouring channel; 9. a cavity; 10. a core frame; 11. a sand core; 12. medium size; 13. performing upper end frame chill; 14. a transition type; 15. connecting runners in series; 16. blind risers; 17. molding; 18. an exhaust hole; 19. and (5) forming the chill.

Detailed Description

The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "vertical," "upper," "lower," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in fig. 1 to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in figures 1 and 2, the low-pressure or differential pressure casting series casting device for the aluminum alloy shell castings comprises a bottom mold 1, a lower mold 5, at least two middle molds 12, at least one transition mold 14 and an upper mold 17.

Wherein the content of the first and second substances,

the bottom mould 1 is provided with a sprue 2 and a cross runner 3; the sprue 2 vertically penetrates through the bottom mould 1, and the bottom end of the sprue 2 is connected with a liquid lifting pipe of low-pressure or differential pressure casting equipment; the horizontal pouring gate 3 is circumferentially arranged on the periphery of the straight pouring gate 2 and is concavely arranged on the top surface of the bottom mould 1, and the horizontal pouring gate 3 is communicated with the straight pouring gate 2.

The lower mould 5 is positioned on the top surface of the bottom mould 1, the lower mould 5 is provided with a plurality of ingates 6, the ingates 6 vertically run through the lower mould 5, and the ingates 6 are communicated with the horizontal runners 3. Further, the cross runners 3 on the top surface of the bottom mold 1 are covered with filter screens 4 for filtering harmful impurities such as ash-containing oxides and various inclusions in the molten metal, so that the molten metal entering the ingate 6 of the lower mold 5 through the cross runners 3 of the bottom mold 1 is cleaner and cleaner, the defects of sand holes, inclusions and the like of castings are eliminated, and the quality of the castings is improved.

The middle 12 is positioned on the top surface of the lower 5, a gap pouring gate 8 which is in one-to-one correspondence and is communicated with the inner pouring gate 6 is arranged in the middle 12, and the gap pouring gate 8 vertically penetrates through the middle 12. A plurality of mesoscales 12 are positioned one above the other in height. A transition type 14 is arranged between two adjacent middle-sized 12, a series pouring gate 15 which is in one-to-one correspondence and is communicated with the gap pouring gate 8 is arranged in the transition type 14, and the series pouring gate 15 vertically penetrates through the transition type 14. It will be appreciated that the number of transitional forms 14 is one less than the number of mesoforms 12.

The upper mold 17 is positioned on the top surface of the middle 12 on the uppermost layer, and the bottom surface of the upper mold 17 is provided with blind risers 16 which are in one-to-one correspondence and communication with the gap runners 8.

The bottom mold 1, the lower mold 5, the middle mold 12, the transition mold 14 and the upper mold 17 form a pouring cavity together, and the middle mold 12 is used for forming aluminum alloy shell type castings.

According to the illustrative embodiment, the transition type 14 is arranged, so that the plurality of medium-sized 12 are overlapped and communicated in height, more than two aluminum alloy shell castings are cast by low-pressure or differential pressure casting equipment at one time, and the problems of low casting yield, high cost and low efficiency caused by casting only one shell at one time by low-pressure or differential pressure casting at one time are solved.

In some embodiments, the top surface of the upper mold 17 is provided with vent holes 18 corresponding to and communicating with the blind risers 16. The illustrative embodiment prevents the occurrence of gas entrapment or insufficient casting at the top of the casting, and improves the feeding effect of the blind riser 16.

In some embodiments, the bottom pattern 1, the bottom pattern 5, the middle pattern 12, the transition pattern 14, and the top pattern 17 are sand molds.

In some embodiments, a sand core 11 is disposed within the midrange 12, and a core frame 10 is disposed vertically within the sand core 11. This exemplary embodiment enhances the overall structural strength of sand core 11.

In some embodiments, a plurality of chills are disposed in the middle 12 to improve the forming quality of the aluminum alloy shell castings. In this embodiment, according to the actual process requirements, the sand core 11 is provided with an upper end frame chill 13 and a lower end frame chill 7, and the outer cavity of the medium 12 is provided with a plurality of outer shape forming chills 19. It should be understood that the present invention is not limited thereto, and those skilled in the art can flexibly arrange the positions and the number of the chills according to the forming process requirements of a specific product.

The invention also provides a series casting method of the low-pressure or differential pressure casting series casting device for the aluminum alloy shell castings, which comprises the following steps:

a molding step, namely manufacturing outer cavities of a bottom mold 1, a lower mold 5, a transition mold 14, an upper mold 17 and a middle mold 12;

a core making step, namely making a medium-sized 12 sand core 11;

combining all sand moulds together and tightly connecting all the box bodies to form the low-pressure or differential pressure casting series casting device for the aluminum alloy shell type castings;

and a pouring step, namely pouring the aluminum alloy shell type casting low-pressure or differential pressure casting serial casting device through low-pressure or differential pressure casting equipment, and performing boxing and cleaning after solidification to obtain a plurality of aluminum alloy shell type castings at one time.

It will be appreciated that the exterior cavity of the medium 12 and the sand core 11 define therebetween a cavity 9 for forming an aluminum alloy shell-type casting.

According to the illustrative embodiment, the manufacturing of the low-pressure or differential-pressure casting series casting device for the aluminum alloy shell castings is realized, a plurality of aluminum alloy shell castings can be cast at one time, the production efficiency is improved, and the production cost is saved.

In some embodiments, in the mold assembling step, the bottom mold 1, the lower mold 5, the at least two middle molds 12, the at least one transition mold 14 and the upper mold 17 are placed from bottom to top to form a cluster for casting more than two aluminum alloy shell type castings at one time. It is understood that the number of castings of the aluminum alloy shell type cast at one time depends on the number of the middle sizes 12; one transition pattern 14 is disposed between two adjacent middle patterns 12, i.e., the number of transition patterns 14 is one less than the number of middle patterns 12.

According to the illustrative embodiment, all casting molds are stringed like string candied haws for casting, and the height space of low-pressure or differential pressure casting equipment is fully utilized to realize casting of a plurality of aluminum alloy shell castings at one time.

In some embodiments, in the core making step, a core box is fixed, an upper end frame chill 13 and a lower end frame chill 7 are placed, a core frame 10 is placed, and then sand filling, tamping and opening of the core box are carried out; the core box is mainly formed by combining two half core boxes.

In some embodiments, in the molding step, the shell mold and the mold of the gap runner 8 are fixed, the shape-forming chill 19 is placed, the middle box is placed, and then sand-filled and tamped while making the outer cavity of the middle mold 12.

In some embodiments, in the molding step, when the upper mold 17 is manufactured, the blind riser 16 model is fixed, the upper box is placed, and then sand filling, tamping and box turning are carried out; an air vent 18 is pricked by an air eye needle at the top of the blind riser 16 and the upper mould 17.

The following further describes the series casting step of the low-pressure or differential pressure casting series casting device for the aluminum alloy shell castings with reference to fig. 1 and 2:

1) making the following model 5:

lifting the lower sand box to a modeling platform, placing an ingate 6 model according to the marking and positioning pin, then filling sand and tamping; scraping the floating sand on the surface, turning the box and taking out the ingate 6 model.

2) Making a sand core 11:

hoisting a required core box to a drag box, and positioning the core box and the drag box by using positioning pins; then, placing an upper end frame chiller 13 and a lower end frame chiller 7 according to the process, putting a core frame 10, filling core sand, tamping layer by layer until reaching the mouth part, and scraping floating sand on the surface; loosening the fastening nut of the core box, and opening the two half core boxes; repairing the sand core 11, spraying paint and baking the sand mold.

3) Preparing a transition type 14:

lifting the transition box onto a modeling platform, placing a series pouring gate 15 model according to the marking and positioning, then filling sand, and tamping; scraping the floating sand on the surface, turning the box, and taking out the series pouring gate 15 model.

4) Manufacturing the outer shape cavity of the medium 12:

lifting the middle box to form a shape cavity of the middle 12, fixing the shell model and the gap runner 8 model by using positioning pins according to the positions of pin holes on the bottom plate, placing the middle box, placing a shape forming chilling block 19, tamping layer by layer till the opening part, and scraping floating sand on the surface; turning over the box; and taking out the shell model and the gap pouring gate 8 model, repairing the external cavity and the gap pouring gate 8 of the medium-sized 12, and brushing the paint.

5) Manufacturing a top mold 17:

lifting an upper box upper mold 17, fixing a blind riser 16 by using a positioning pin according to the position of a pin hole on a bottom plate, putting the upper box, tamping layer by layer until reaching the opening part, and scraping floating sand on the surface; turning over the box; taking out the blind riser 16 model; an air vent 18 is pricked at the top of the blind riser 16 and the upper mould 17 by an air eye needle, and the paint is brushed.

6) Bottom-making type 1:

lifting a bottom box bottom forming mold 1, fixing a horizontal pouring gate 3 model and a straight pouring gate 2 model by using positioning pins according to the positions of pin holes on a bottom plate, placing the bottom box, tamping layer by layer until the bottom box reaches an opening part, and scraping floating sand on the surface; turning over the box; taking out the horizontal runner 3 model and the straight runner 2 model; and (5) modifying and brushing paint.

7) Assembling the box:

positioning a middle 12 and a lower 5 by a mould assembling guide rod and assembling the mould; finely adjusting the distance between the outer mold cavity of the middle-sized mold 12 and the sand core 11; positioning the combined middle 12, lower 5 and bottom 1 by a mould assembling guide rod, and assembling the mould;

positioning and assembling the other medium-sized 12 and the transition-type 14 by using an assembling guide rod; finely adjusting the distance between the outer mold cavity of the middle-sized mold 12 and the sand core 11; positioning and assembling the assembled middle-sized 12, transition-type 14 and the last middle-sized 12 by using an assembling guide rod;

positioning the upper mold 17 and the middle 12 on the uppermost layer by using a mold assembling guide rod, and assembling the mold;

and connecting all the combined sand molds together by using a box tightening screw rod.

8) Pouring:

pouring by using low-pressure or counter-pressure casting equipment, and then boxing, cleaning, scribing and carrying out heat treatment.

Through the description of the embodiments of the low-pressure or differential-pressure casting series casting device and the series casting method for the aluminum alloy shell castings, the invention can be seen to have at least one or more of the following advantages:

1. through the arrangement of the transition type 14, more than two aluminum alloy shell castings are cast by low-pressure or differential pressure casting equipment at one time, and the problems of low casting yield, high cost and low efficiency caused by casting only one shell at one time by the conventional low-pressure or differential pressure casting are solved;

2. the invention has simple structure and process and strong practicability, fully utilizes the height space of low-pressure or counter-pressure casting equipment, obviously improves the production efficiency of low-pressure or counter-pressure casting of the aluminum alloy shell castings, reduces the production cost and has good popularization and application values.

Finally, it should be noted that: the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.