Integrated high-pressure double-injection-position pouring and discharging system for lower car body and die casting process

Abstract

The invention relates to the technical field of lower car body production, in particular to a high-pressure double-injection-position pouring and discharging system for an integrated lower car body and a die casting technology. Pouring systems communicated with the pouring and discharging cavity are symmetrically distributed on the two sides of the pouring and discharging cavity; the pouring system comprises an outer pouring gate, a pouring gate and an inner pouring gate; the outer pouring gate is connected with the inner pouring gate through a pouring gate; the inner pouring gate is communicated with the pouring row cavity; the pouring and discharging system disclosed by the invention is mainly suitable for a high-pressure die-casting process, and symmetrical filling is formed for filling of an integrated lower vehicle body by using the double pouring systems and adopting the completely symmetrical pouring systems; the pouring efficiency of the lower car body can be guaranteed, meanwhile, molten aluminum is injected into the two pouring systems to be subjected to hedging, and the mixing uniformity of the molten aluminum can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of lower vehicle body production, in particular to a high-pressure double-shot pouring system and a die-casting process for an integrated lower vehicle body. Background Art

[0002] At present, the large structural parts of the lower body are mainly produced by stamping and welding assembly, which leads to a large number of parts in the entire lower body. The number of stamped parts of the entire lower body is as high as more than 150. The large number of parts easily leads to matching and connection problems in the manufacturing process, and there are also huge challenges in controlling the product size.

[0003] At present, some models of the front engine compartment and rear body used in the automobile market are manufactured by one-piece die-casting, so that more than 70 parts are replaced by one die-casting, which greatly reduces the number of parts in the lower body. For example, the rear body of Tesla Model Y is formed by one-piece die-casting, and the front engine compartment of Xiaopeng G6 and other models is formed by one-piece die-casting, which greatly reduces the number of parts in the entire lower body.

[0004] In addition, one-piece die-casting uses die-cast aluminum instead of the original sheet metal stamping and welding production method, which greatly reduces the process steps, greatly shortens the length of the entire production line, greatly improves production efficiency, and greatly reduces the production line footprint. At the same time, compared with steel, the processing difficulty of aluminum is greatly reduced, and energy consumption is also greatly reduced.

[0005] However, the one-piece lower body currently generally adopts single-sided or center pouring. The inherent disadvantage of the single-sided pouring system is that the gate is far away from the wheel arch and the end of the product, and the elongation performance of the end and wheel arch cannot be guaranteed. The wheel arch and the end often use the SPR (holeless self-piercing rivet) process, which has certain requirements on the elongation performance of aluminum parts, thereby increasing the risk of cracking in the SPR process.

[0006] In the single-sided pouring system, the aluminum alloy liquid is filled through the inner gate to reach the end of the product. Compared with the double-sided process, it is farther away and the process is doubled. The farthest process is as long as 3000mm. The temperature of the aluminum alloy liquid drops greatly, and the risk of cold shut and product filling is greater than that of the double-sided filling.

[0007] The existing patent 201922355320.X - A mold pouring system for die-cast automotive parts does not clearly disclose the technical content that solves the above-mentioned technical problems.

[0008] Therefore, in order to solve or improve at least one of the above problems, it is necessary to optimize the design of the existing pouring system. Summary of the invention

[0009] The object of the present invention is to provide a double-sided pouring system suitable for high-pressure die casting.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is:

[0011] A high-pressure double-shot pouring system for an integrated lower body, comprising a pouring cavity; pouring systems connected to the pouring cavity are symmetrically distributed on both sides of the pouring cavity;

[0012] The pouring system comprises an external gate, a runner and an internal gate; the external gate is connected to the internal gate through the runner; and the internal gate is communicated with the pouring cavity.

[0013] The ingates all include multiple single ingates; each single ingate in each ingate is distributed in sequence on the side of the lower body along the X-axis direction of the lower body; the ingate is a trailing ingate.

[0014] The runner includes a main runner and two branch runners; the main runner is connected to the corresponding inner gate through the two branch runners.

[0015] The cross-sectional area of ​​the runner gradually decreases from the outer gate to the corresponding inner gate.

[0016] The main runner is arranged in an inclined manner when in use; and an arc-shaped surface transition is adopted at the connection between the main runner and the branch runner.

[0017] The monomer ingate near the connection between the main runner and the branch runner has a flow-limiting corner.

[0018] The connection between the branch runner and each monomer inner gate adopts an arc surface transition.

[0019] The middle area of ​​the pouring cavity forms a confluence area;

[0020] In the pouring system, the liquid flowing into the pouring system is offset in the confluence area.

[0021] The pouring system also includes a slag bag arranged in the middle area of ​​the pouring cavity; the total volume of the slag bag is V1; the volume of the confluence area is V2; and V1 is required to be not less than V2.

[0022] The liquid inlet speed of the monomer ingates connected to the same area of ​​the lower body is the same.

[0023] The pouring system is arranged in the longitudinal direction, and the pouring system in the pouring system is pre-filled with liquid through the wheel housing of the lower vehicle body.

[0024] A die-casting process based on the high-pressure dual-shot pouring system for the integrated lower body, the die-casting process comprising the following steps:

[0025] Step 1: Select a die-casting mold; the die-casting mold has a gating system;

[0026] Step 2: Inspect the die casting machine;

[0027] Step 3: Spray an isolation layer in the die casting mold cavity;

[0028] Step 4: The pouring liquid enters the corresponding barrel of the die-casting machine; the die-casting machine includes two independent injection systems; the pouring liquid is injected by the injection system into the pouring system;

[0029] Step 5: Die-casting mold closing: After the casting liquid fills the die-casting mold cavity, the die-casting machine is used to die-cast the parts into one piece. The parts are cooled and taken out by the picking robot. The production of one part is completed. If new parts need to be produced, the next cycle can be started.

[0030] The advantages of the present invention are:

[0031] The invention discloses a high-pressure double-shot pouring system and a die-casting process for an integrated lower vehicle body.

[0032] The pouring system disclosed in the present invention is mainly suitable for high-pressure die-casting processes. The present invention uses a double pouring system and a completely symmetrical pouring system to form symmetrical filling for the filling of the one-piece lower body; not only can the pouring efficiency of the lower body be guaranteed, but also the uniformity of the mixing of the aluminum liquid can be guaranteed by the counter-action of the aluminum liquid injected by the two pouring systems.

[0033] At the same time, the liquid enters through the wheel arch of the lower body; thus greatly reducing the risk of cracking at the SPR connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0035] Figure 1 It is the first axonometric view of the pouring system in the present invention.

[0036] Figure 2 This is the second axonometric view of the pouring system of the present invention.

[0037] Figure 3 It is a top view of the pouring system in the present invention.

[0038] Figure 4 It is a process flow chart of the die-casting process of the present invention.

[0039] The marks in the above figure are:

[0040] 1. Gating system, 11. External gate, 12. Runner, 13. Internal gate. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0042] A high-pressure dual-pressure injection pouring system 1 for an integrated lower body comprises a pouring cavity 14; pouring systems 101 connected to the pouring cavity 14 are symmetrically distributed on both sides of the pouring cavity 14; the pouring system 1 disclosed in the present invention is mainly suitable for high-pressure die-casting processes, and the present invention uses a dual pouring system 101 and a completely symmetrical pouring system 101 to form symmetrical filling for the integrated lower body; not only can the pouring efficiency of the lower body be guaranteed, but also the uniformity of the mixing of the molten aluminum can be guaranteed by the counter-action of the aluminum liquid injected by the two pouring systems 101.

[0043] Specifically, the pouring system 1 disclosed in the present invention mainly includes a pouring cavity 14; the pouring cavity 14 is used for liquid injection molding of the lower body; at the same time, the pouring system 101 connected to the pouring cavity 14 is symmetrically distributed on both sides of the pouring cavity 14 in the present invention; the pouring system 101 of the present invention is a runner 12 system; through the above design, the present invention enables the pouring system 1 to have two sets of runner 12 systems, which can greatly improve the mechanical properties of the two ends of the lower body, and the elongation is the key factor for the qualified SPR connection, thereby greatly improving the qualified rate of the SPR connection points of the product.

[0044] At the same time, in the present invention, the pouring system 101 includes an external gate 11, a runner 12 and an internal gate 13; the external gate 11 is connected to the internal gate 13 through the runner 12; the internal gate 13 is connected to the pouring cavity 14; the coordinated use of the external gate 11, the runner 12 and the internal gate 13 can realize the liquid inlet operation of the aluminum liquid, which facilitates the subsequent pouring and molding of the lower body.

[0045] Furthermore, the gate 13 in the present invention includes multiple single gates 131; the single gates 131 in each gate 13 are distributed in sequence on the side of the lower body along the X-axis direction of the lower body; based on such a setting, the lower body can have multiple liquid inlet points in the X-axis direction of the body, which can speed up the punching speed of the casting cavity 14; at the same time, due to the increase in the punching speed, the temperature of the aluminum liquid decreases less during the subsequent filling process, and the risk of defects such as cold shut flow marks in the product is greatly reduced.

[0046] In addition, in the present invention, the inner gate 13 is a running inner gate 13; the double-shot inner gate 13 of the present invention is designed in a completely conformal manner, and the entire gate is arranged completely according to the edge shape of the lower vehicle body on both sides, which not only greatly increases the entire filling area of ​​the product, but also directly fills the edge of the product, effectively improving the mechanical properties such as the elongation of the wheel cover, especially the elongation performance. The higher the elongation, the lower the risk of SPR cracking, thereby greatly improving the qualified rate of SPR connection.

[0047] Furthermore, in the present invention, the runner 12 includes a main runner 121 and two branch runners 122; the main runner 121 is connected to the corresponding inner gate 13 through the two branch runners 122; the main runner 121 is mainly used to connect with the outer gate 11, and the branch runners 122 are distributed along the side length direction of the pouring cavity 14; such a setting can increase the area of ​​the inner gate 13 to a certain extent and optimize the liquid inlet speed of the pouring cavity 14; at the same time, through the use of the branch runner 122, it is convenient to divert the aluminum liquid coming in from the main runner 121, and facilitate the liquid injection operation of multiple positions of the inner gate 13.

[0048] Furthermore, in the present invention, the cross-sectional area of ​​the runner 12 gradually decreases from the outer gate 11 to the corresponding inner gate 13; such a setting can speed up the flow speed of the molten aluminum in the runner 12; optimize the aluminum liquid punching speed, ensure that the aluminum liquid temperature drops less during the filling process, and greatly reduce the risk of defects such as cold shut flow marks in the product.

[0049] Furthermore, the main runner 121 described in the present invention is arranged at an angle when in use; the main runner 121 is arranged at an angle, which facilitates the flow of molten aluminum in the main runner 121. At the same time, an arc surface transition is adopted at the connection between the main runner 121 and the branch runner 122 described in the present invention; such a setting can reduce the excessive running resistance formed by the molten aluminum at the connection between the main runner 121 and the branch runner 122 when the main runner 121 is diverted to the branch runner 122.

[0050] Furthermore, in the present invention, the monomer inner gate 131 near the connection between the main runner 121 and the branch runner 122 has a flow limiting corner 132; because the liquid inlet speed of the monomer inner gate 131 near the connection between the main runner 121 and the branch runner 122 is relatively large, in order to reduce the flow rate of the monomer inner gate 131 at this location, a flow limiting corner 132 is set through the monomer inner gate 131 at this location, thereby reducing the flow rate in the monomer inner gate 131 at this location; try to ensure the consistency of the aluminum liquid entering the casting cavity 14, and avoid the aluminum liquid flow rate between adjacent monomer inner gates 131. Too large a difference in each other to generate eddy currents, causing subsequent casting defects of the lower body.

[0051] Furthermore, in the present invention, the connection between the branch runner 122 and each monomer ingate 131 adopts an arc surface transition; such a setting can reduce the running resistance at the connection between the branch runner 122 and each corresponding monomer ingate 131.

[0052] Furthermore, in the present invention, a confluence area 102 is formed in the middle area of ​​the pouring cavity 14; the liquid in the pouring system 101 impacts each other in the confluence area 102; with such a configuration, during the subsequent filling operation, the two streams of aluminum liquid provided by the two pouring systems 101 instantly impact and impact each other, generating a large impact energy, effectively causing the two streams of aluminum liquid to fuse, reducing aluminum liquid fusion defects, and greatly improving the mechanical properties of the product, especially on both sides of the front floor and the wheel arch of the lower body, thereby greatly reducing the risk of cracking at the SPR connection.

[0053] Furthermore, the pouring system 1 in the present invention also includes a slag bag 15 arranged in the middle area of ​​the pouring cavity 14; the slag bag 15 is located in the middle of the product, where the aluminum liquid converges, and the volume of the slag bag 15 is approximately 5%-8% of the total weight of the product, which can effectively collect the aluminum temperature at the end of the product and reduce the temperature of the product to a relatively low cold material.

[0054] In the present invention, the total volume of the slag bag 15 is V1; the volume of the confluence area 102 is V2; V1 is required to be not less than V2; the end cold material of the product confluence area 102 volume can be discharged into the slag bag 15 to the maximum extent; even if the confluence area 102 is not in the center of the product, the end cold material can be discharged into the slag bag 15; and the use effect of the pouring system 1 is optimized.

[0055] Furthermore, in the present invention, the liquid inlet speeds of the single body inner gates 131 connected to the same area of ​​the lower body are the same; such a setting can ensure the consistency of the aluminum liquid entering the same area of ​​the lower body through the corresponding single body inner gates 131 into the pouring cavity 14, and avoid the aluminum liquid flow rate of the corresponding single body inner gates 131 in the same area is too different to generate eddy currents in the pouring cavity 14, resulting in subsequent casting defects of the lower body; affecting the high-pressure die-casting effect of the lower body.

[0056] Furthermore, in the present invention, the pouring system 1 is arranged longitudinally, and the pouring system 101 in the pouring system 1 is pre-filled with liquid through the lower body wheel arch; based on such a design, the molten aluminum can preferentially enter the edge of the wheel arch flange, and preferentially fill the edge of the wheel arch. Compared with the traditional center pouring and single-side pouring, the wheel arch is the filling end and becomes the filling starting position, thereby reducing the risk of insufficient filling. In addition, the edge of the wheel arch is close to the inner gate 13, and sufficient pressurization capacity can be obtained, and the tissue density of the wheel arch edge is higher; at the same time, through the liquid filling at the lower body wheel arch; the risk of cracking at the SPR connection is greatly reduced.

[0057] specific;

[0058] The present invention discloses a high-pressure dual-shot pouring system 1 for an integrated lower body; the integrated lower body adopts a dual-shot pouring system 101, and a completely symmetrical pouring system 101 is adopted to form a symmetrical filling for the integrated lower body. The filling time of the traditional single-sided filling method is ≥100ms, and the filling time of the dual-shot method can be shortened to ≤70ms, which greatly expands the die-casting process window and reduces the debugging difficulty of on-site process personnel.

[0059] In addition, the entire ingates 13 in the pouring system 101 of the present invention are arranged along the outer contour of the lower vehicle body, and the conformal ingates 13 are arranged to form a completely symmetrical structure, which can greatly shorten the distance from the ingates 13 to both sides of the lower vehicle body. At the same time, after filling, the two streams of aluminum liquid instantly impact and collide with each other, generating a large impact energy, which effectively causes the aluminum liquid to fuse, reduces aluminum liquid fusion defects, and greatly improves the mechanical properties of the product, especially on both sides of the front floor and the wheel arch of the lower vehicle body, thereby greatly reducing the risk of cracking at the spr connection.

[0060] Example 1 is as follows:

[0061] The pouring system 1 disclosed in the present invention includes an external gate 11, which is mainly composed of two cakes; the cake thickness is about 40±5mm and the diameter is ≥280mm. This size can greatly improve the gate ratio of the pouring system 1, increase the thickness of the internal gate 13 during die casting, and prevent the cake from bursting during the production process.

[0062] Runner 12: The horizontal runner 12 is directed upward in the opposite direction of gravity, and the cross-sectional area gradually decreases. The runner 12 includes a main runner 121 and a branch runner 122. The main runner 121 is then divided into two branch runners 122. The cross-sectional areas of the two branch runners 122 are also gradually reduced, so as to improve the acceleration effect of the aluminum liquid in the runner. The branch runner is connected with 10 monomer internal gates 131.

[0063] During subsequent use, the molten aluminum will first enter the edge of the wheel arch flange and fill the edge of the wheel arch preferentially. Compared with the traditional center pouring and single-side pouring, the wheel arch is changed from the filling end to the filling starting position, thereby reducing the risk of insufficient filling. In addition, the edge of the wheel arch is close to the gate and can obtain sufficient pressurization capacity. The density of the wheel arch edge is higher, which can reduce the risk of defects at the edge of the wheel arch, thereby improving the mechanical properties of the product. Then the molten aluminum enters the lower body from the edge of the wheel arch to fill the integrated lower body, and the filling distance is also close.

[0064] In addition, the traditional one-piece lower body pouring method is limited to the center pouring, and the gate area that can be arranged is small. The inner gate area is generally ≤5000mm 2The aluminum liquid flow is relatively small, which will increase the overall time of aluminum liquid filling the product. The filling time is ≤120ms. During the filling process, the aluminum liquid temperature drops significantly, and the product is prone to defects such as cold shut marks. The double runner 12 is used to increase the area of ​​the inner gate 13. The overall area of ​​the inner gate 13 is ≤9000mm 2 The aluminum liquid flow rate is about twice that of the original product, and the overall filling time of the product is ≤70ms. During the filling process, the aluminum liquid temperature drops less, and the risk of defects such as cold shut flow marks in the product is greatly reduced.

[0065] Slag bag 15: Slag bag 15 is located in the middle of the product, where the aluminum liquid converges. The volume of slag bag 15 is about 5%-8% of the total weight of the product. It can effectively collect the aluminum temperature at the end of the product and reduce the temperature of the product to a relatively low level.

[0066] The gate 13 is a conformal gate 13, and the double-shot gate 13 is designed in a completely conformal manner. The entire gate is arranged completely according to the edge shape of the lower body, which not only greatly increases the entire filling area of ​​the product, but also directly fills the edge of the product, effectively improving the mechanical properties of the wheel cover such as the elongation, especially the elongation performance. The higher the elongation, the lower the risk of SPR cracking, thereby greatly improving the qualified rate of SPR connection.

[0067] At the same time, in the present invention, the middle confluence area 102 of the product includes the product and the slag bag 15, the total volume of the slag bag 15 is V1, the volume of the product confluence part is V2, V1≥V2, and the end cold material of the product confluence part volume can be discharged into the slag bag 15 to the maximum extent; even if the confluence part is not in the center of the product, the end cold material can be discharged into the slag bag 15.

[0068] According to V1≥V2 (V2 is the volume of the product confluence);

[0069] V1 = (0.05-0.2) V (V is the volume of the product);

[0070] As shown in the figure below, the specific design method of the pouring system 1 is as follows:

[0071] Select the filling time t according to the product wall thickness;

[0072]

[0073] (1) S1 = G / t (S is the area of ​​the inner gate 13, G is the filling mass, and t is the filling time);

[0074] (2) S2 = n*S1 (S2 is the punch area, n1 is the acceleration ratio, ranging from 7 to 11);

[0075] (3) S2=Πd 2 / 4(Π=3.14, d is the punch diameter,);

[0076] (4) Calculate the punch diameter according to the formula in step 4, and then round it up to select the punch suitable for die casting;

[0077] (5) Calculate the number of gates 13 n2 = S1 / L based on the area calculated in step (1) (L is generally selected as 80 mm ≤ L ≤ 200 mm for such large structural parts);

[0078] (6) The results obtained in step (5) are evenly distributed on both sides of the product. The runner 12 is designed based on the specific simulation results and the specific design ideas of each mold factory.

[0079] A die-casting mold having the above-mentioned pouring system has the following die-casting process based on the die-casting mold.

[0080] A one-piece lower body double-shot die-casting process comprises the following steps:

[0081] Step 1: Select a die-casting mold; the die-casting mold has a gating system 1;

[0082] The pouring system 1 comprises a pouring cavity 14; a pouring system 101 connected to the pouring cavity 14 is symmetrically distributed on both sides of the pouring cavity 14;

[0083] The pouring system 101 includes an external gate 11, a runner 12 and an internal gate 13; the external gate 11 is connected to the internal gate 13 through the runner 12; the internal gate 13 is connected to the pouring cavity 14;

[0084] Step 2: Inspect the die casting machine;

[0085] Step 3: Spray an isolation layer in the die casting mold cavity;

[0086] Step 4: The pouring liquid enters the corresponding barrel of the die-casting machine; the die-casting machine includes two independent injection systems; the pouring liquid is injected by the injection system into the pouring system 1;

[0087] Step 5: Die-casting mold closing: After the casting liquid fills the die-casting mold cavity, the die-casting machine is used to die-cast the parts into one piece. The parts are cooled and taken out by the picking robot. The production of one part is completed. If new parts need to be produced, the next cycle can be started.

[0088] The present invention is mainly a high-pressure die-casting process through the double-shot die-casting process of the one-piece lower body.

[0089] In the present invention, the casting liquid is generally aluminum liquid.

[0090] The present invention can realize the one-piece molding of the lower body at one time through the implementation of the above-mentioned die-casting process, which greatly speeds up the production efficiency of the lower body.

[0091] At the same time, the die-casting machine of the present invention has two independent injection systems and cooperates with the double-injection position pouring system 1 at the same time; it can form a symmetrical filling for the filling of the integrated lower body; it can not only ensure the pouring efficiency of the lower body, but also the two pouring systems 101 inject aluminum liquid through hedging, which can also ensure the uniformity of aluminum liquid mixing.

[0092] At the same time, the liquid enters through the wheel arch of the lower body; thus greatly reducing the risk of cracking at the SPR connection.

[0093] In the present invention, the specific process steps are as follows:

[0094] S1: Select a die-casting mold and install a barrel on the fixed mold template. Because the present invention is a double-shot injection, the present invention has two barrels, and the two barrels are respectively connected to the two pouring systems 101;

[0095] Specifically, install the mold fixed die on the die casting dynamic and fixed platens; the dynamic and fixed platens need to be installed on a press with dual-shot capability;

[0096] The pouring system 1 of the present invention comprises a pouring cavity 14; a pouring system 101 connected to the pouring cavity 14 is symmetrically distributed on both sides of the pouring cavity 14; the pouring system 101 comprises an external gate 11, a runner 12 and an internal gate 13; the external gate 11 is connected to the internal gate 13 through the runner 12; the internal gate 13 is connected to the pouring cavity 14;

[0097] The pouring system 1 disclosed in the present invention includes an external gate 11, which is mainly composed of two cakes; the cake thickness is about 40±5mm and the diameter is ≥280mm. This size can greatly improve the gate ratio of the pouring system 1, increase the thickness of the internal gate 13 during die casting, and prevent the cake from bursting during the production process.

[0098] S2: Check the die-casting machine to ensure that the equipment is in normal working condition; preset 10 sections of injection position and speed, select the boost trigger position, cooling time, core pulling action sequence and speed, product ejection position and ejection force, mold opening and locking action position, punch lubrication position and lubrication amount, start the equipment, monitor the injection curve, and adjust and optimize the above process parameters in real time. Compared with the traditional single injection curve, the control system needs to adjust the two-shot system;

[0099] S3: Spray the mold surface by micro-spraying to produce a uniform isolation layer on the mold surface to facilitate subsequent demoulding;

[0100] The isolation layer is sprayed on the mold by pulse micro-spraying. Pulse micro-spraying is a high-precision spraying technology that uses tiny nozzles and low-flow spraying equipment to accurately spray the release agent onto the mold surface to form a lubricating isolation film. Compared with the traditional continuous spraying method, this technology can significantly reduce the use of release agent, while improving spraying efficiency and casting quality; pulse spraying technology uses intermittent spraying, that is, spray-stop-spray-stop-spray, which can reduce thermal shock to the mold, reduce the temperature gradient and thermal stress of the mold, and thus increase the life of the mold. Micro-spraying technology can increase the production capacity of die castings, reduce the amount of dilution water and wastewater, extend the service life of the mold, and significantly reduce costs.

[0101] S4: The aluminum liquid is poured into the barrel through the machine-side holding furnace. The die-casting machine consists of two independent injection systems. The injection systems follow the master-slave control mode. After the aluminum liquid enters the injection barrel, synchronous injection is performed, and the injection synchronization is ≤20ms;

[0102] S5: The mold is closed, and after the aluminum liquid fills the cavity, it is die-casted into one piece by a die-casting machine. The parts are cooled, and the parts are taken out by a picking robot to start the next cycle;

[0103] S6: The present invention relates to two machine-side insulation furnaces. The weight of the molten aluminum is controlled by a liquid level sensor on the furnace body. When the injection command is issued, the weight difference of the molten aluminum in the two machine-side insulation furnaces needs to be guaranteed to be ±1% by controlling the pressure and time of the liquid lifting pump, and the temperature of the two streams of molten aluminum is ≤3°C.

[0104] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A high-pressure double-shot pouring system for an integrated lower body, characterized in that: Including pouring cavity; A pouring system connected to the pouring cavity is symmetrically distributed on both sides of the pouring cavity; The pouring system comprises an external gate, a runner and an internal gate; the external gate is connected to the internal gate through the runner; and the internal gate is communicated with the pouring cavity.

2. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 1, characterized in that: The ingates all include multiple single ingates; each single ingate in each ingate is distributed in sequence on the side of the lower body along the X-axis direction of the lower body; the ingate is a trailing ingate.

3. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 2, characterized in that: The runner includes a main runner and two branch runners; the main runner is connected to the corresponding inner gate through the two branch runners. The cross-sectional area of ​​the runner gradually decreases from the outer gate to the corresponding inner gate.

4. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 3, characterized in that: The main runner is arranged in an inclined manner when in use; and an arc-shaped surface transition is adopted at the connection between the main runner and the branch runner.

5. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 3, characterized in that: The monomer ingate near the connection between the main runner and the branch runner has a flow-limiting corner.

6. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 3, characterized in that: The connection between the branch runner and each monomer inner gate adopts an arc surface transition.

7. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 1, characterized in that: The middle area of ​​the pouring cavity forms a confluence area; In the pouring system, the liquid flowing into the pouring system is offset in the confluence area.

8. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 7, characterized in that: The pouring system also includes a slag bag arranged in the middle area of ​​the pouring cavity; the total volume of the slag bag is V1; the volume of the confluence area is V2; and V1 is required to be not less than V2.

9. The high-pressure double-shot pouring system for an integrated lower vehicle body according to claim 3, characterized in that: The liquid inlet speed of the monomer gates connected to the same area of ​​the lower body is the same; the pouring system is arranged in the longitudinal direction, and the pouring system in the pouring system is pre-filled with liquid through the wheel cover of the lower body.

10. A die-casting process based on the high-pressure dual-shot pouring system for the one-piece lower body according to any one of claims 1 to 9, characterized in that: The die casting process comprises the following steps: Step 1: Select a die-casting mold; the die-casting mold has a gating system; Step 2: Inspect the die casting machine; Step 3: Spray an isolation layer in the die casting mold cavity; Step 4: The pouring liquid enters the corresponding barrel of the die-casting machine; the die-casting machine includes two independent injection systems; The pouring liquid is injected into the pouring system by the injection system; Step 5: Die-casting mold closing: After the casting liquid fills the die-casting mold cavity, the die-casting machine is used to die-cast the parts into one piece. The parts are cooled and taken out by the picking robot. The production of one part is completed. If new parts need to be produced, the next cycle can be started.

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