CN113927017A

CN113927017A - Sub vehicle frame aluminium low pressure casting mould

Info

Publication number: CN113927017A
Application number: CN202111151540.6A
Authority: CN
Inventors: 吴国昌; 任金磊; 赵韩杨; 王玉玉
Original assignee: Ningbo Jianxin Huayi Aluminum Co ltd
Current assignee: Ningbo Jianxin Huayi Aluminum Co ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-01-14

Abstract

The invention relates to an auxiliary frame aluminum low-pressure casting die which comprises an upper die and a lower die, wherein a pouring gate and a riser are arranged on the upper die, and the pouring gate, a cavity and the riser are communicated; also provided with an ejection mechanism, an exhaust system and a cooling system. Be provided with exhaust system on the mould, set up the exhaust structure of three kinds of types, can be very first time with the gaseous exhaust of mould die cavity, resistance when reducing aluminium liquid and flowing is favorable to aluminium liquid to flow in the die cavity, especially can flow smoothly in the thinner department of wall thickness, sufficient die cavity. The cooling system cooperation of mould is stablizing the accuse ware, realizes the aluminium liquid of rising head distal end through the temperature of control rising head distal end mould and cools off earlier, and aluminium system product feeding is guaranteed to the aluminium liquid aftercooling of rising head department, reaches the abundant effect of die cavity aluminium liquid, ensures that the wall thickness that obtains is complete. The inner port of the exhaust needle pore passage is arranged on the end surface of the thimble port. The upper mold core and the lower mold core are both composed of two mold cores and are connected by an I-shaped piece. The advantage is that the deformation of the mould after being heated is reduced. Belongs to the technical field of moulds.

Description

Sub vehicle frame aluminium low pressure casting mould

Technical Field

The invention belongs to the technical field of dies, and particularly relates to a low-pressure casting die capable of producing an aluminum part product with a thinner wall thickness.

Background

The product size of the traditional low-pressure casting production is generally below 500mm x 500mm, the wall thickness is more than 6mm, the product size of the conventional low-pressure casting aluminum alloy auxiliary frame is 1m x 1m, the wall thickness is 3.5-4.5mm, the conventional low-pressure casting aluminum alloy auxiliary frame belongs to a large thin-wall low-pressure casting part, and the process difficulty is high. Die casting is a metal casting process and is characterized in that high pressure is applied to molten metal by utilizing an inner cavity of a die. The mold is typically machined from a stronger alloy, a process somewhat similar to injection molding. Most die cast parts are iron-free and typically contain ingredients such as zinc, copper, aluminum, magnesium, lead, tin and lead-tin alloys and alloys thereof. Depending on the type of die casting, either a cold chamber die casting machine or a hot chamber die casting machine may be used. The casting equipment and molds are expensive to manufacture, and therefore the die casting process is typically only used to mass produce a large number of products. It is relatively easy to manufacture die-cast parts, which typically require only four main steps, with a low incremental cost alone. Die casting is particularly suitable for manufacturing a large number of small and medium-sized castings, so die casting is the most widely used one of various casting processes. Compared with other casting technologies, the die-cast surface is smoother and has higher size consistency. However, the wall thickness of the automobile subframe aluminum piece processed by the conventional general aluminum casting die is basically more than 6mm, so that the processing of the aluminum piece with the wall thickness of less than 4.5mm and more 3.5mm is difficult. The main reason is that the wall thickness of the aluminum part is thinner, so that the gap between the corresponding cavities of the mold is smaller, the fluidity of the aluminum liquid in the aluminum part is subjected to larger resistance, and part of the aluminum liquid does not reach or cannot reach, so that the product defects are incomplete. In addition, in the process of die casting, the flowability of the aluminum liquid influences the forming of aluminum parts with thinner walls and thickness, and the cooling sequence of the aluminum liquid is also the reason that the existing die cannot produce aluminum parts with thinner walls.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides an auxiliary frame aluminum casting mould, solves current aluminum casting mould aluminium liquid mobility poor, the cooling inequality leads to unable processing production wall thickness to be 3.5mm even thinner aluminium spare.

The technical scheme adopted by the invention is as follows: an auxiliary frame aluminum casting mold comprises an upper mold, an upper mold core, a lower mold and a lower mold core, wherein the upper mold core and the lower mold core are combined to form a cavity for forming an auxiliary frame; the lower die is also provided with an ejection mechanism, an ejector pin of the ejection mechanism is movably matched in a pin hole of the lower die core, the end surface of the free end of the ejector pin extends into the die cavity and is level with the inner bottom surface of the die cavity, an exhaust gap is formed between the outer wall of the free end of the ejector pin and the inner wall of the pin hole, the ejector pin is provided with an exhaust pin hole channel below the exhaust gap along the length direction of the ejector pin, and the exhaust pin hole channel is communicated with the exhaust gap; the insert is provided with an exhaust hole; the upper die is provided with a plurality of vent plugs which are arranged along the flowing direction of the aluminum liquid in the cavity; the exhaust gap, the exhaust hole and the exhaust plug are communicated with the cavity to form an exhaust system; and a cooling system arranged along the direction of the sprue self-riser is also arranged in the mold.

The outer wall below the free end of the ejector pin is radially retracted inwards to form an exhaust cavity, the ejector pin is provided with an exhaust pin hole along the length direction, the inner end of the exhaust pin hole is communicated with the exhaust cavity, and the exhaust cavity is communicated with the exhaust gap; the exhaust needle hole and the exhaust cavity are connected to form an exhaust needle pore passage.

The exhaust needle pore passage is a gap pore passage between the outer wall of the ejector needle and the needle hole, and the aperture of the gap pore passage is gradually increased from the free end of the ejector needle to the fixed end of the ejector needle.

The size of the exhaust gap is 0.8-1 mm.

The inner port of the exhaust needle pore passage is arranged on the end surface of the thimble port.

The upper mold core and the lower mold core are both composed of two mold cores and are connected by an I-shaped piece.

The upper die and the lower die are both hollowed to form a cooling cavity, and the cooling system is installed in the cavity.

The cooling system comprises a cooling pipeline and a plurality of temperature controllers.

The gate is provided with nine positions.

The riser is provided with fourteen positions.

The invention has the technical effects that: the exhaust plug realizes the conventional exhaust of the cavity, the exhaust hole of the insert realizes the exhaust of the thick position of the casting, and the exhaust gap realizes the exhaust of the bottom in the cavity. The arrangement of the air needle pore passage is convenient for air to enter the cavity when the product is ejected in the row demoulding process, reduces the negative pressure in the cavity and is beneficial to demoulding. In addition, the mould still is provided with cooling system, and cooling system is coordinating steady accuse ware, realizes the aluminium liquid of rising head distal end department earlier to cool off through the temperature of control rising head distal end mould, and the aluminium liquid aftercooling of rising head department guarantees aluminium system product feeding, reaches the abundant effect of die cavity aluminium liquid, ensures that the wall thickness that obtains is complete. The inner port of the exhaust needle pore passage is arranged on the end surface of the thimble port. The upper mold core and the lower mold core are both composed of two mold cores and are connected by an I-shaped piece. The advantage is that the deformation of the mould after being heated is reduced.

The mould is hollowed to form a cooling cavity, and the cooling system is installed in the cavity.

The gate is provided with nine positions. The advantage is that the runner guarantees that the aluminium product fills the mould.

The riser is provided with fourteen positions. The method has the advantage of ensuring feeding of aluminum products.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a schematic view of the upper die of the present invention.

FIG. 3 is a schematic view of the side core back of the present invention in combination with a casting.

Fig. 4 is a perspective view of the lower mold of the present invention.

FIG. 5 is a schematic view of the lower die of the present invention.

FIG. 6 is a schematic view of the upper mold and the upper mold core of the present invention.

FIG. 7 is a schematic view of the thimble according to the present invention.

FIG. 8 is a schematic cross-sectional view of the thimble and the lower mold core according to the present invention.

In the figure, an upper die 1, an upper die core 2, a lower die 3, a lower die core 4, a die cavity 5, a slide block 6, a side core 7, a pouring gate 8, a riser 9, an ejector pin 10, an exhaust pin hole 10.1, an exhaust gap 10.2, an exhaust cavity 10.3 and an exhaust pin hole 10.4 are shown. Insert 11, exhaust hole 11.1.

Detailed Description

The following description is presented to disclose the invention in order to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

As shown in fig. 1 to 8, in the first embodiment: the utility model provides an aluminium casting mould for shaping car sub vehicle frame, sub vehicle frame are aluminium goods, include last mould 1, go up mould core 2, lower mould 3, lower mould core 4, go up mould 1, go up mould core 2, lower mould 3, lower mould core 4, all adopt the metal material to make. The upper die core 2 and the lower die core 4 are combined to form a cavity 5 for forming the auxiliary frame, and the shape of the cavity 5 is matched with the auxiliary frame to be formed. The upper mold core 2 and the lower mold core 4 respectively comprise a plurality of sliding blocks and inserts 11, the inserts 11 are components of the mold core, and the inserts 11 can slide relative to the mold core, so that the sliding blocks 6 are externally connected with side loose cores 7, and the side loose cores 7 are externally connected with oil cylinders. The upper die 1 is provided with a plurality of risers 9, the lower die 3 is provided with a plurality of gates 8, and the gates 8, the cavity 5 and the risers 9 are communicated; the gates 8 are arranged at the top of the upper die, and nine gates are arranged in the embodiment; fourteen risers 9 are provided. The upper die 1 and the lower die 3 are both hollowed to form cooling cavities, a cooling system is arranged along the direction from the sprue 8 to the riser 9, and 40 cooling pipelines are designed to control the temperature balance of the die and the solidification sequence of castings. The upper mold core 2 and the lower mold core 4 are both composed of two mold cores and are connected by an I-shaped piece. The more the number of the pouring gates 8 is, the higher the speed of pouring molten aluminum is, and the molten aluminum can be poured from various angles, so that the shape of the product is ensured. The feeder head 9 uses the runner 8 to give off to all around as the center, arranges the terminal that the aluminium liquid of die cavity 5 flows, plays the feeding effect in the product cooling process, and the quantity of feeder head 9 is far greater than runner 8, and the purpose is that it is smooth and easy to guarantee to exhaust on the aluminium liquid flow line of die cavity 5, also is convenient for collect the waste residue simultaneously. The invention is provided with an ejection mechanism on the lower die 3, which is positioned below the lower die 3, the ejection system of the ejection mechanism is consistent with the conventional system and generally comprises an ejector pin and an oil cylinder, but the end surface of the free end of the thimble 10 of the ejection mechanism of the invention extends into the cavity 5 and is level with the inner bottom surface of the cavity 5, in order to improve the exhaust effect in the cavity 5, an exhaust gap 10.2 is formed between the outer wall of the free end of the thimble 10 and the inner wall of the pinhole of the lower die core 4, the size of the exhaust gap 10.2 is smaller (0.8-1 mm), the size is 1mm in the embodiment, the aluminum liquid cannot enter the exhaust gap, gas can be discharged from the gas discharge slit 10.2 into the gas discharge pin hole 10.1 provided therebelow and arranged along the length direction of the thimble 10, the aperture of the exhaust needle pore canal 10.1 is larger than that of the exhaust gap 10.2, so that the exhaust efficiency is improved; in this embodiment, the exhaust needle hole 10.1 means that the outer wall below the free end of the thimble 10 is radially inwardly contracted to form an exhaust cavity 10.3, the exhaust cavity 10.3 is annularly arranged, the thimble 10 is provided with an exhaust needle hole 10.4 along the length direction, the inner end of the exhaust needle hole 10.4 is communicated with the exhaust cavity 10.3, and the outer end is communicated with the outside. The exhaust cavity 10.3 is communicated with the exhaust gap 10.2; the exhaust needle hole 10.4 and the exhaust cavity 10.3 are connected to form an exhaust needle hole 10.1, and the dotted line with an arrow in fig. 8 is the exhaust direction. The insert 11 is provided with a vent hole 11.1, the insert 11 is arranged at a thick position of the casting, the insert 11 is adopted to form the shape of the casting, and the vent hole 11.1 is arranged for facilitating the venting at the position; the upper die 1 is provided with a plurality of vent plugs which are arranged along the flowing direction of the aluminum liquid in the cavity 5; the exhaust gap 10.2, the exhaust hole 11.1 and the exhaust plug are communicated with the cavity 5 to form an exhaust system, the exhaust system is arranged, and when aluminum liquid enters from the pouring gate 8, the aluminum liquid can be guaranteed to have small resistance due to smooth exhaust, and the aluminum liquid can smoothly enter the cavity 5 to be completely filled.

In the second embodiment, another technical solution of the exhaust needle duct 10.1 is that the exhaust needle duct 10.1 is a gap duct between the outer wall of the thimble 10 and the needle hole, and the aperture of the gap duct is gradually enlarged from the free end of the thimble 10 to the fixed end.

In the third embodiment, on the basis of the first embodiment or the second embodiment, the outer end of the exhaust needle hole 10.4 is connected with a suction pump, so that part of gas in the cavity 5 can be pumped away in the casting process, and the flowing and mold filling of aluminum liquid are facilitated.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed.

Claims

1. The auxiliary frame aluminum low-pressure casting die comprises an upper die (1), an upper die core (2), a lower die (3) and a lower die core (4), wherein the upper die core (2) and the lower die core (4) are combined to form a cavity (5) of a formed auxiliary frame, the upper die core (2) and the lower die core (4) respectively comprise a plurality of sliding blocks (6) and inserts (11), side loose cores (7) are connected outside the sliding blocks (6), oil cylinders are connected outside the side loose cores (7), a plurality of pouring gates (8) and a plurality of dead heads (9) are arranged on the die, and the pouring gates (8), the cavity (5) and the dead heads (9) are communicated; the lower die (3) is also provided with an ejection mechanism, an ejector pin (10) of the ejection mechanism is movably matched in a pin hole of the lower die core (4), the end surface of the free end of the ejector pin (10) extends into the die cavity (5) and is flush with the inner bottom surface of the die cavity (5), an exhaust gap (10.2) is formed between the outer wall of the free end of the ejector pin (10) and the inner wall of the pin hole, an exhaust pin hole channel (10.1) is arranged below the exhaust gap (10.2) along the length direction of the ejector pin (10) on the ejector pin (10), and the exhaust pin hole channel (10.1) is communicated with the exhaust gap (10.2); the insert (11) is provided with an exhaust hole (11.1); the upper die (1) is provided with a plurality of vent plugs which are arranged along the flowing direction of the aluminum liquid in the cavity (5); the exhaust gap (10.2), the exhaust hole (11.1) and the exhaust plug are communicated with the cavity (5) to form an exhaust system; and a cooling system arranged along the direction of the sprue (8) from the riser (9) is also arranged in the mold.

2. The auxiliary frame aluminum low-pressure casting die as claimed in claim 1, wherein: the outer wall below the free end of the thimble (10) is radially retracted inwards to form an exhaust cavity (10.3), the thimble (10) is provided with an exhaust needle hole (10.4) along the length direction, the inner end of the exhaust needle hole (10.4) is communicated with the exhaust cavity (10.3), and the exhaust cavity (10.3) is communicated with the exhaust gap (10.2); the exhaust needle hole (10.4) and the exhaust cavity (10.3) are connected to form an exhaust needle pore canal (10.1).

3. The auxiliary frame aluminum low-pressure casting die as claimed in claim 1, wherein: the size of the exhaust gap (10.2) is 0.8-1 mm.

4. The auxiliary frame aluminum low-pressure casting die as claimed in claim 1, wherein: the exhaust needle pore passage (10.1) is a gap pore passage between the outer wall of the ejector needle (10) and the needle hole, and the aperture of the gap pore passage is gradually enlarged from the free end of the ejector needle (10) to the fixed end.

5. The auxiliary frame aluminum low-pressure casting die as claimed in claim 1, wherein: the upper die core (2) and the lower die core (4) are composed of two die cores and are connected by an I-shaped piece.

6. The auxiliary frame aluminum low-pressure casting die as claimed in claim 1, wherein: the upper die (1) and the lower die (3) are both hollowed to form a cooling cavity, and the cooling system is installed in the cavity.

7. The auxiliary frame aluminum low-pressure casting die as claimed in claim 6, wherein: the cooling system comprises a cooling pipeline and a plurality of temperature controllers.

8. The auxiliary frame aluminum low-pressure casting die as claimed in claim 1, wherein: nine gates (8) are arranged.

9. The auxiliary frame aluminum low-pressure casting die as claimed in claim 1, wherein: the feeder head (9) is provided with fourteen positions.

10. The auxiliary frame aluminum low-pressure casting die as claimed in claim 2, wherein: the outer end of the exhaust pinhole (10.4) is connected with an air exhaust mechanism.