A method for casting and forming a vehicle frame

Abstract

The present invention discloses a method for casting and forming a vehicle frame, which relates to the technical field of vehicle frame production. The vehicle frame is modeled and analyzed to obtain a first preset feeding position and a second preset feeding position of the cavity in the casting mold for producing the vehicle frame; a main runner of the casting mold is arranged along the parting line, a feeding runner is arranged between the main runner and the first preset feeding position, and a feeding runner is arranged between the main runner and the second preset feeding position. The main runner, the feeding runner and the feeding runner satisfy the following relational expression: 0.12 ≤ 【m<supgt;2< / supgt> / (1 + m<supgt;2< / supgt> + n<supgt;2< / supgt>)】*k ≤ 0.4; where m is the ratio of the cross-sectional area of the main runner to the cross-sectional area of the feeding runner, n is the ratio of the cross-sectional area of the main runner to the cross-sectional area of the feeding runner, and k is the flow coefficient. The method for casting and forming a vehicle frame provided by the present invention can reasonably control the cross-sectional area ratio of the main runner, the feeding runner and the feeding runner, ensure that the molten metal fully fills the cavity, and improve the product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of frame production, and more particularly, to a method for casting and forming a frame. Background Art

[0002] Currently, compared with the development status of the traditional automotive industry, new energy vehicles are restricted by problems such as excessive vehicle weight and insufficient installed battery power, which seriously affect the cruising range and result in a low market share for new energy vehicles. Therefore, while improving power batteries, new energy vehicle manufacturers also try to use lighter alloy chassis to replace steel chassis to reduce the vehicle weight. Compared with steel chassis, alloy chassis have advantages such as light weight, corrosion resistance, and rust resistance, which can effectively improve the cruising range. Current alloy chassis frames are generally formed by low-pressure casting. Due to the large size, thin walls, and uneven wall thickness of the frame, there is a problem of dispersed hot spots during the forming process, resulting in the inability of the molten metal to fully fill the cavity and affecting product quality.

[0003] In view of this, it is particularly important to design a method for casting and forming a frame with good product quality, especially in frame production. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for casting and forming a frame, which can reasonably control the cross-sectional area ratio of the main runner, the feeding runner, and the feeding runner, ensure that the molten metal fully fills the cavity, and improve product quality.

[0005] The present invention is implemented by the following technical solutions.

[0006] A method for casting and forming a frame includes: performing a modeling analysis on the frame to obtain a preset feeding position of the cavity in the casting mold for producing the frame, where the preset feeding position includes a first preset feeding position and a second preset feeding position, the first preset feeding position is located on the parting line of the cavity, and the second preset feeding position is spaced from the parting line; extending the main runner of the casting mold along the parting line, arranging a feeding runner between the main runner and the first preset feeding position, and arranging a feeding runner between the main runner and the second preset feeding position, and the main runner, the feeding runner, and the feeding runner satisfy the following relationship: 0.12 ≤

m 2 / (1 + m 2 + n 2 )

[0007] Optionally, in the step of modeling and analyzing the vehicle frame to obtain the preset feeding position of the cavity in the casting mold for producing the vehicle frame, the preset feeding position corresponds to the position of the thickening part of the vehicle frame; alternatively, the preset feeding position corresponds to the position of the large thin-walled surface part of the vehicle frame.

[0008] Optionally, a liquid-lifting port is arranged at the bottom of the main runner, and the heights of the feeding runner and the feeding and feeding runner are both greater than the height of the liquid-lifting port, and the liquid-lifting port is used for injecting molten metal.

[0009] Optionally, the number of the liquid-lifting ports is multiple, and the multiple liquid-lifting ports are arranged at intervals.

[0010] Optionally, the main runner surrounds the cavity.

[0011] Optionally, the parting line is arranged in a stepped shape, and the parting line includes a first step section, a second step section and a third step section connected in sequence. The first step section is higher than the second step section, and the second step section is higher than the third step section; the main runner includes a first main runner, a second main runner and a third main runner. The first main runner extends along the first step section, the second main runner extends along the second step section, and the third main runner extends along the third step section. The first main runner, the second main runner and the third main runner are all communicated with the cavity.

[0012] Optionally, the step of injecting molten metal into the cavity through the main runner, the feeding runner and the feeding and feeding runner to form the vehicle frame includes: injecting molten metal into the main runner according to the first preset injection pressure and the first preset injection speed until the liquid level of the molten metal rises to the gate of the casting mold; continuing to inject molten metal into the main runner according to the second preset injection pressure and the second preset injection speed to ensure that the cavity is filled with molten metal, wherein the second preset injection pressure is greater than the first preset injection pressure, and the second preset injection speed is less than the first preset injection speed.

[0013] Optionally, the range of the first preset injection pressure is 100 mbar to 150 mbar, and the range of the second preset injection pressure is 200 mbar to 250 mbar; the range of the first preset injection speed is 12 mbar / s to 15 mbar / s, and the range of the second preset injection speed is 8 mbar / s to 10 mbar / s.

[0014] Optionally, after the step of injecting molten metal into the cavity through the main runner, the feeding runner and the feeding and feeding runner to form the vehicle frame, the vehicle frame casting method further includes: quickly increasing the injection pressure of the molten metal to the third preset injection pressure and maintaining it for a preset time; relieving the pressure to make the molten metal flow back, and after the vehicle frame in the cavity is cooled and solidified, opening the mold to take out the vehicle frame.

[0015] Optionally, the range of the third preset injection pressure is 350 mbar to 400 mbar, and the range of the preset time is 150 s to 200 s.

[0016] The frame casting and forming method provided by the present invention has the following beneficial effects:

[0017] For the frame casting and forming method provided by the present invention, the frame is modeled and analyzed to obtain the preset feeding positions of the cavities in the casting mold for producing the frame. Among them, the preset feeding positions include a first preset feeding position and a second preset feeding position. The first preset feeding position is located on the parting line of the cavity, and the second preset feeding position is arranged at an interval from the parting line; a main runner of the casting mold is arranged along the extension of the parting line, a feeding runner is arranged between the main runner and the first preset feeding position, and a feeding and feeding runner is arranged between the main runner and the second preset feeding position. The main runner, the feeding runner and the feeding and feeding runner satisfy the following relational expression: 0.12 ≤

m 2 / (1 + m 2 + n 2 )

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of arranging the main runner, the feeding runner and the feeding and feeding runner outside the frame in the frame casting and forming method provided by the embodiment of the present invention;

[0020] Figure 2 It is a step block diagram of the frame casting and forming method provided by the embodiment of the present invention.

[0021] Icon: 110 - main runner; 111 - liquid-lifting port; 112 - first main runner; 113 - second main runner; 114 - third main runner; 120 - feeding runner; 130 - feeding and feeding runner; 200 - frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "connected", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the features in the following embodiments can be combined with each other.

[0028] Please refer jointly to Figure 1 and Figure 2, an embodiment of the present invention provides a method for casting and forming a vehicle frame, which is used to produce the vehicle frame 200. It can reasonably control the cross-sectional area ratio of the main runner 110, the feed runner 120, and the feeding runner 130, ensure that the molten metal fully fills the cavity, and improve the product quality.

[0029] The method for casting and forming the vehicle frame includes the following steps:

[0030] Step S110: Perform modeling analysis on the vehicle frame 200 to obtain the preset feeding positions of the cavity in the casting mold for producing the vehicle frame 200. Among them, the preset feeding positions include a first preset feeding position and a second preset feeding position. The first preset feeding position is located on the parting line of the cavity, and the second preset feeding position is arranged at an interval from the parting line.

[0031] It should be noted that in step S110, first, the vehicle frame 200 is imported into the modeling software according to the designed shape and size to generate a model; then, the vehicle frame 200 model is analyzed to obtain the positions of the thickening parts and the large thin-walled parts of the vehicle frame 200. Among them, the thickening parts are located at the positions with larger wall thickness on the vehicle frame 200, especially at the intersections of multiple beams, while the large thin-walled parts are located at the positions with smaller wall thickness and larger coverage area on the vehicle frame 200. Both the thickening parts and the large thin-walled parts are parts that are prone to hot spot dispersion problems during the casting and forming process in the prior art; then, according to the positions of the thickening parts and the large thin-walled parts of the vehicle frame 200, the preset feeding positions of the cavity in the casting mold for producing the vehicle frame 200 are obtained. Among them, the preset feeding positions correspond to the positions of the thickening parts of the vehicle frame 200, or the preset feeding positions correspond to the positions of the large thin-walled parts of the vehicle frame 200. That is, during the casting and forming process of the vehicle frame 200, molten metal is injected into the cavity through the preset feeding positions, so that the molten metal preferentially flows into the positions of the thickening parts and the large thin-walled parts of the vehicle frame 200, thereby ensuring the forming effect of the thickening parts and the large thin-walled parts of the vehicle frame 200, and further ensuring the product quality.

[0032] Further, the preset feeding positions include a first preset feeding position and a second preset feeding position. The first preset feeding position is located on the parting line of the cavity. The first preset feeding position is the conventional feeding position (main feeding position) for casting and forming, and most of the molten metal enters the cavity through the first preset feeding position to achieve the casting and forming function; the second preset feeding position is arranged at an interval from the parting line. The second preset feeding position is the feeding position for feeding and shrinking (auxiliary feeding position) for casting and forming, and a small part of the molten metal enters the cavity through the second preset feeding position to achieve the feeding and shrinking function and ensure the product quality.

[0033] Step S120: Extend the main runner 110 of the casting mold along the parting line, arrange the feed runner 120 between the main runner 110 and the first preset feeding position, and arrange the feeding and feeding runner 120 and the feeding and feeding runner 130 satisfy the following relational formula; 0.12 ≤

m 2 / (1 + m 2 + n 2 )

[0034] It should be noted that in step S120, first, the main runner 110 is arranged outside the cavity. The main runner 110 is arranged along the extension direction of the parting line for easy production and processing. The main runner 110 is the necessary channel for the molten metal to flow into the cavity, and all the molten metal needs to flow into the cavity through the main runner 110; Subsequently, the feed runner 120 is arranged between the main runner 110 and the first preset feeding position, and the feeding and feeding runner 130 is arranged between the main runner 110 and the second preset feeding position. The feed runner 120 and the feeding and feeding runner 130 are both branch channels for the molten metal to flow into the cavity. The molten metal injected into the main runner 110 can enter the cavity through the feed runner 120 and the feeding and feeding runner 130 respectively. Among them, since the first preset feeding position is located on the parting line, the feed runner 120 is arranged perpendicular to the parting line. Also, since the second preset feeding position is arranged at an interval from the parting line, the feeding and feeding runner 130 is arranged obliquely to the parting line.

[0035] In this embodiment, the number of the first preset feeding positions and the feed runners 120 are both multiple. One end of each feed runner 120 is connected to a first preset feeding position of the cavity, and the other end is connected to the main runner 110; The number of the second preset feeding positions and the feeding and feeding runners 130 are both multiple. One end of each feeding and feeding runner 130 is connected to a second preset feeding position of the cavity, and the other end is connected to the main runner 110.

[0036] The inventor's research found that in the prior art, there is no distinction between the feeding runner 120 and the feeding and feeding runner 130. In most existing casting molds, the cross-sectional areas of the feeding runner 120 and the feeding and feeding runner 130 are the same, and both are smaller than the cross-sectional area of the main runner 110. This causes the molten metal to pass through the feeding runner 120 and the feeding and feeding runner 130 at the same speed under the same pressure. However, due to the different installation positions of the feeding runner 120 and the feeding and feeding runner 130, the angles at which the molten metal enters the cavity from the feeding runner 120 and the feeding and feeding runner 130 are also different. This easily leads to the problem of heat sink dispersion, resulting in the molten metal not being able to fully fill the cavity and affecting the product quality. In the present invention, the ratio of the cross-sectional area of the main runner 110 to the cross-sectional area of the feeding runner 120 and the ratio of the cross-sectional area of the main runner 110 to the cross-sectional area of the feeding and feeding runner 130 are limited, and the cross-sectional area ratios of the main runner 110, the feeding runner 120, and the feeding and feeding runner 130 are reasonably controlled, so that the cross-sectional areas of the main runner 110, the feeding runner 120, and the feeding and feeding runner 130 are all within a reasonable range, which can effectively avoid the problem of heat sink dispersion, ensure that the molten metal fully fills the cavity, and improve the product quality.

[0037] It should be noted that the main runner 110, the feeding runner 120, and the feeding and feeding runner 130 satisfy the following relationship: 0.12 ≤

m 2 / (1 + m 2 + n 2 )

[0038] Furthermore, the flow coefficient is related to the material of the vehicle frame 200, that is, related to the material of the molten metal. In this embodiment, the molten metal is made of aluminum alloy, and its flow coefficient is generally between 0.3 and 0.7, and specifically needs to be determined according to the proportion and density of various metals in it. However, it is not limited to this. In other embodiments, the molten metal can be made of steel or iron, and the material of the molten metal and the corresponding flow coefficient are not specifically limited.

[0039] It should be noted that a liquid-lifting port 111 is provided at the bottom of the main runner 110. The liquid-lifting port 111 is the feeding port of the main runner 110. The heights of the feeding runner 120 and the feeding and feeding runner 130 are both greater than the height of the liquid-lifting port 111. The liquid-lifting port 111 is used for injecting molten metal. The molten metal overflows upward through the liquid-lifting port 111 under the action of an external pressure to quickly fill the main runner 110 and flow into the cavity through the feeding runner 120 and the feeding and feeding runner 130. In this embodiment, the number of the liquid-lifting ports 111 is multiple, and the multiple liquid-lifting ports 111 are arranged at intervals and feed at the same time to improve the feeding efficiency, thereby shortening the production cycle and improving the production efficiency.

[0040] In this embodiment, the sprue 110 is arranged around the cavity to facilitate the production and processing of the feed runner 120 and the feeding and compensation runner 130, so that the molten metal in the sprue 110 can quickly fill the cavity through the feed runner 120 and the feeding and compensation runner 130, ensuring the product quality.

[0041] In this embodiment, the parting line is arranged in a stepped shape. The parting line includes a first step section, a second step section and a third step section connected in sequence. The first step section is higher than the second step section, and the second step section is higher than the third step section. Correspondingly, the sprue 110 includes a first sprue 112, a second sprue 113 and a third sprue 114. The first sprue 112 extends along the first step section, the second sprue 113 extends along the second step section, and the third sprue 114 extends along the third step section. The first sprue 112, the second sprue 113 and the third sprue 114 are all communicated with the cavity. Specifically, the first sprue 112 is communicated with the cavity through a plurality of feed runners 120 and a plurality of feeding and compensation runners 130 respectively, the second sprue 113 is communicated with the cavity through a plurality of feed runners 120 and a plurality of feeding and compensation runners 130 respectively, and the third sprue 114 is communicated with the cavity through a plurality of feed runners 120 and a plurality of feeding and compensation runners 130 respectively, so as to realize multi-stage simultaneous liquid injection, further improve the feeding efficiency, shorten the production cycle and improve the production efficiency.

[0042] Step S130: Inject molten metal into the cavity through the sprue 110, the feed runner 120 and the feeding and compensation runner 130 to form the vehicle frame 200.

[0043] Specifically, step S130 includes two steps, which are respectively:

[0044] Step S131: Inject molten metal into the sprue 110 according to the first preset injection pressure and the first preset injection speed until the liquid level of the molten metal rises to the gate of the casting mold.

[0045] It should be noted that in step S131, the molten metal is injected into the sprue 110 with a relatively low first preset injection pressure and a relatively fast first preset injection speed to realize the function of rapid liquid level rise, so that the liquid level of the molten metal quickly rises to the gate of the casting mold, and the liquid level rise efficiency is high.

[0046] Step S132: Continue to inject molten metal into the sprue 110 according to the second preset injection pressure and the second preset injection speed to ensure that the cavity is filled with molten metal. Among them, the second preset injection pressure is greater than the first preset injection pressure, and the second preset injection speed is less than the first preset injection speed.

[0047] It should be noted that in step S132, the molten metal is injected into the main runner 110 at a relatively high first preset injection pressure and a relatively slow first preset injection speed to achieve a stable filling function, ensure that the entire cavity is filled with the molten metal, and thus improve the product quality.

[0048] Furthermore, the range of the first preset injection pressure is from 100 mbar to 150 mbar, and the range of the second preset injection pressure is from 200 mbar to 250 mbar; the range of the first preset injection speed is from 12 mbar / s to 15 mbar / s, and the range of the second preset injection speed is from 8 mbar / s to 10 mbar / s; reasonable ranges of the first preset injection pressure, the second preset injection pressure, the first preset injection speed, and the second preset injection speed can improve the liquid injection efficiency as much as possible while ensuring the product quality, shorten the production cycle, and improve the production efficiency.

[0049] In this embodiment, the first preset injection pressure is 125 mbar, the second preset injection pressure is 225 mbar, the first preset injection speed is 13 mbar / s, and the second preset injection speed is 9 mbar / s. However, it is not limited thereto. In other embodiments, the first preset injection pressure can be 100 mbar or 150 mbar, the second preset injection pressure can be 200 mbar or 250 mbar, the first preset injection speed can be 12 mbar / s or 15 mbar / s, and the second preset injection speed can be 8 mbar / s or 10 mbar / s. The first preset injection pressure, the second preset injection pressure, the first preset injection speed, and the second preset injection speed are not specifically limited.

[0050] Step S140: Rapidly increase the injection pressure of the molten metal to the third preset injection pressure and maintain it for a preset duration.

[0051] It should be noted that in step S140, the frame 200 in the cavity is pressure-maintained at the highest third preset injection pressure for a preset duration to increase the density and uniformity of the frame 200, improve the mechanical properties of the frame 200, and optimize the appearance and surface quality of the frame 200.

[0052] Furthermore, the range of the third preset injection pressure is from 350 mbar to 400 mbar, and the range of the preset duration is from 150 s to 200 s. Reasonable ranges of the third preset injection pressure and the preset duration can ensure the product quality of the frame 200, shorten the production cycle, and improve the production efficiency.

[0053] In this embodiment, the third preset injection pressure is 375 mbar and the preset duration is 180 s. However, it is not limited thereto. In other embodiments, the third preset injection pressure may be 350 mbar or 400 mbar, and the preset duration may be 150 s or 200 s. The third preset injection pressure and the preset duration are not specifically limited.

[0054] Step S150: Release the pressure to make the molten metal flow back. After the frame 200 in the mold cavity is cooled and solidified, open the mold to take out the frame 200.

[0055] It should be noted that in step S150, first release the pressure to make the excess molten metal flow back into the holding furnace to recover the excess molten metal, save material costs, and facilitate the next casting. Subsequently, wait for the frame 200 in the mold cavity to be cooled and solidified. Then open the casting mold and take out the formed frame 200 from the casting mold to complete the casting of the frame 200.

[0056] The frame casting method provided by the embodiment of the present invention performs modeling analysis on the frame 200 to obtain the preset feeding positions of the cavities in the casting mold for producing the frame 200. Among them, the preset feeding positions include a first preset feeding position and a second preset feeding position. The first preset feeding position is located on the parting line of the cavity, and the second preset feeding position is arranged at an interval from the parting line. The main runner 110 of the casting mold is arranged along the extension of the parting line. A feeding runner 120 is arranged between the main runner 110 and the first preset feeding position, and a feeding runner 130 is arranged between the main runner 110 and the second preset feeding position. The main runner 110, the feeding runner 120, and the feeding runner 130 satisfy the following relational expression: 0.12 ≤

m 2 / (1 + m 2 + n 2 )

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A frame casting method, characterized in that: include: Modeling and analyzing the vehicle frame to obtain a preset feed position of a cavity in a casting mold for producing the vehicle frame, wherein the preset feed position includes a first preset feed position and a second preset feed position, the first preset feed position is located on a parting line of the cavity, and the second preset feed position is spaced apart from the parting line; A main channel of the casting mold is extended along the parting line, a feed channel is provided between the main channel and the first preset feed position, and a feeding channel is provided between the main channel and the second preset feed position, and the main channel, the feed channel and the feeding channel satisfy the following relationship; 0.12≤【m 2 / (1+m 2 +n 2 )】*k≤0.4; Wherein, m is the ratio of the cross-sectional area of ​​the main flow channel to the cross-sectional area of ​​the feed flow channel, n is the ratio of the cross-sectional area of ​​the main flow channel to the cross-sectional area of ​​the feeding flow channel, and k is the flow coefficient; Liquid metal is injected into the mold cavity through the main flow channel, the feed flow channel and the feeding flow channel to form the vehicle frame.

2. The frame casting method according to claim 1, characterized in that: In the step of modeling and analyzing the frame to obtain a preset feed position of a cavity in a casting mold for producing the frame, the preset feed position corresponds to the position of a thickened portion of the frame; or, the preset feed position corresponds to the position of a large thin-walled portion of the frame.

3. The frame casting method according to claim 1, characterized in that: A liquid riser is provided at the bottom of the main flow channel, the heights of the feed flow channel and the feeding flow channel are both greater than the height of the liquid riser, and the liquid riser is used for injection of molten metal.

4. The frame casting method according to claim 3, characterized in that: There are multiple liquid rising ports, and the multiple liquid rising ports are arranged at intervals.

5. The frame casting method according to claim 1, characterized in that: The main flow channel is arranged outside the cavity.

6. The frame casting method according to claim 1, characterized in that: The parting line is arranged in a stepped shape, and the parting line comprises a first step, a second step and a third step connected in sequence, the first step is higher than the second step, and the second step is higher than the third step; The main channel includes a first main channel, a second main channel and a third main channel. The first main channel extends along the first step, the second main channel extends along the second step, and the third main channel extends along the third step. The first main channel, the second main channel and the third main channel are all connected to the cavity.

7. The frame casting method according to claim 1, characterized in that: The step of injecting molten metal into the mold cavity through the main flow channel, the feed flow channel and the feeding flow channel to form the frame includes: Injecting molten metal into the main channel according to a first preset injection pressure and a first preset injection speed until the liquid level of the molten metal rises to the gate of the casting mold; Continue to inject molten metal into the main channel according to a second preset injection pressure and a second preset injection speed to ensure that the molten metal fills the mold cavity, wherein the second preset injection pressure is greater than the first preset injection pressure, and the second preset injection speed is less than the first preset injection speed.

8. The frame casting method according to claim 7, characterized in that: The first preset injection pressure ranges from 100 mbar to 150 mbar, and the second preset injection pressure ranges from 200 mbar to 250 mbar; the first preset injection speed ranges from 12 mbar / s to 15 mbar / s, and the second preset injection speed ranges from 8 mbar / s to 10 mbar / s.

9. The frame casting method according to claim 1, characterized in that: After the step of injecting molten metal into the mold cavity through the main flow channel, the feed flow channel and the feeding flow channel to form the frame, the frame casting method further includes: Rapidly increase the injection pressure of the molten metal to a third preset injection pressure and maintain it for a preset time; The pressure is released to allow the molten metal to flow back, and after the frame in the cavity is cooled and solidified, the mold is opened and the frame is taken out.

10. The frame casting method according to claim 9, characterized in that: The third preset injection pressure ranges from 350 mbar to 400 mbar, and the preset time ranges from 150 s to 200 s.

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