CN117182031A - Die casting forming method and die casting - Google Patents

Abstract

The invention provides a die casting forming method and a die casting, and relates to the technical field of machining, wherein the die casting forming method comprises the following steps: sealing two ends of a pipe fitting with a cavity and placing the pipe fitting into a die cavity of a die casting die; and pressing a molten die casting material into the die cavity, and performing die casting to obtain a die casting. The die casting molding method can improve the bending and torsion resistance and the impact resistance of the die casting, so that excessive reinforcing ribs are not required to be arranged, the problem of breakage of the inner die core of the die is solved, the service life of the die is prolonged, and the production cost is reduced.

Description

Die casting forming method and die casting

Technical Field

The invention relates to the technical field of machining, in particular to a die casting forming method and a die casting.

Background

The die casting is a die casting part, and because of the specificity of a casting method, the strength of the die casting is generally higher than that of a casting obtained by common casting, so that the die casting is widely applied to the fields of automobile manufacturing, photovoltaic energy sources and the like. The die casting is generally manufactured by adopting a high-pressure casting method, and the high-pressure casting method has the advantages of high production efficiency, high integration and the like, and can better meet the mass production requirement of the die casting. However, the high pressure casting method generally gives die castings with poor bending torsion resistance and impact resistance. Therefore, in order to improve the torsional and bending resistance and impact resistance of the die cast, an additional design of the die casting method is required.

At present, the die casting molding method generally improves the torsion resistance, the bending resistance and the impact resistance of the die casting by additionally molding a plurality of reinforcing ribs for the die casting, but the increase of the reinforcing ribs can lead to more complex design of the die casting mold, so that isolated areas of the mold cores of the mold are increased, the mold cores are easily broken in the die casting process, the service life of the mold is influenced, and the production cost is increased.

Disclosure of Invention

The invention aims to solve the problem that the die core of a die is easy to break in the existing die casting forming method, so that the service life of the die is influenced.

In order to solve the above problems, the present invention provides a die casting method, comprising:

sealing two ends of a pipe fitting with a cavity and placing the pipe fitting into a die cavity of a die casting die;

and pressing a molten die casting material into the die cavity, and performing die casting to obtain a die casting.

Optionally, before sealing the two ends of the pipe with the cavity and placing the pipe in the cavity of the die casting mold, the method further comprises:

preheating the die casting die, and spraying a release agent on the cavity surface of the die cavity.

Optionally, after the sealing treatment of the two ends of the pipe with the cavity and placing the pipe in the cavity of the die casting mold, the pressing molten die casting material into the cavity is pressed, and before the die casting is obtained, the method further comprises:

and sealing the die casting die, and then pumping out air in the die cavity.

Optionally, after the molten die casting material is pressed into the die cavity and die-cast, the method further includes:

and carrying out heat treatment on the die casting.

Optionally, the die casting mold comprises a female mold and a male mold, wherein a cavity groove with a downward notch is formed in the bottom surface of the female mold, and when the top surface of the male mold is connected to the bottom surface of the female mold, the lower notch of the cavity groove is closed by the top surface of the male mold to form the die cavity.

Optionally, the outer pipe wall of the pipe fitting is provided with a flat surface, and the flat surface is provided with a positioning hole;

a positioning boss is arranged on the top surface of the male die, a positioning plane is arranged at the upper end of the positioning boss, and a positioning pin is arranged on the positioning plane;

after the pipe fitting is placed in the die cavity, the flat surface is attached to the positioning plane, and the positioning hole is matched with the positioning pin hole.

Optionally, an air passage is arranged in the positioning pin, the air passage extends along the axial direction of the positioning pin, one end of the air passage penetrates through the upper end face of the positioning pin, and the other end of the air passage penetrates through the bottom face of the male die; and/or the number of the groups of groups,

the edge of the upper end face of the positioning pin is provided with a chamfer; and/or the number of the groups of groups,

the positioning plane is provided with an overflow stopping groove, and the overflow stopping groove is circumferentially arranged along the circumferential direction of the positioning pin; and/or the number of the groups of groups,

the upper end face of the positioning boss is concavely formed with a plurality of reinforcing rib forming grooves.

Optionally, before sealing the two ends of the pipe with the cavity and placing the pipe in the cavity of the die casting mold, the method further comprises:

and heating and softening the pipe fitting raw material, and then performing extrusion molding processing to obtain the pipe fitting.

Optionally, after the pipe fitting raw material is heated and softened and then is subjected to extrusion molding treatment to obtain the pipe fitting, before the two ends of the pipe fitting with the cavity are sealed and placed in the die cavity of the die casting die, the method further comprises:

and bending the pipe fitting.

The invention also provides a die casting which is manufactured by adopting the die casting molding method.

Compared with the prior art, the die-casting molding method provided by the invention has the following technical effects:

firstly, two ends of a pipe fitting with a cavity are sealed and placed in a die cavity of a die-casting die, for example, the die-casting die can be opened to be in a die-opening state, then the pipe fitting is placed on a male die of the die-casting die, after positioning, the die-casting die is closed, so that the pipe fitting is placed in the die cavity, wherein the pipe fitting in the die cavity can be used as a base of a die-casting material to be solidified to form the cavity. In addition, the pipe is usually open at both ends, and the cavity of the pipe may be sealed by, for example, attaching end plates or sealing the open ends with a mold. And then, pressing a molten die casting material into a die cavity, and performing die casting to realize die casting molding to obtain the required die casting. In the die casting process, as the pipe fitting with the cavity is placed in the die cavity, and the two ends of the pipe fitting are subjected to sealing treatment, after the molten die casting material is pressed in, the die casting material can rapidly surround the pipe fitting and cannot enter the cavity of the pipe fitting, a cavity matched with the shape of the pipe fitting can be formed after the die casting material is solidified, namely, the pipe fitting with the cavity is contained in the final die casting, and the cavity surrounding the pipe fitting is formed outside the pipe fitting, so that the bending and torsion resistance and the impact resistance of the die casting can be improved through the pipe fitting and the cavity, and excessive reinforcing ribs are not required to be arranged, so that the problem of die core breakage in the die is solved, the service life of the die is prolonged, and the production cost is reduced.

Drawings

FIG. 1 is a schematic flow chart of a die casting method according to an embodiment of the invention;

FIG. 2 is a schematic view of a die casting mold according to an embodiment of the present invention;

FIG. 3 is a schematic view of a die casting mold according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a die-casting mold with a concave-convex die separated after die-casting according to an embodiment of the present invention;

FIG. 5 is a schematic view of a die casting obtained after die casting according to an embodiment of the present invention;

FIG. 6 is a schematic view of a die cast after material removal in accordance with an embodiment of the present invention;

FIG. 7 is a bottom view of the die cast of FIG. 6;

FIG. 8 is a schematic view of a die casting having a closed cavity according to an embodiment of the present invention;

FIG. 9 is a bottom view of the die cast of FIG. 8;

FIG. 10 is a schematic view of a pipe fitting according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a male die of the die casting die according to the embodiment of the present invention;

FIG. 12 is an enlarged schematic view of a portion A of the male mold of FIG. 11;

FIG. 13 is an enlarged schematic view of a portion B of the male mold of FIG. 11;

figure 14 is a cross-sectional view of the locating pin of the punch of figure 9;

FIG. 15 is a schematic view of a single-cavity cross-section tube in accordance with an embodiment of the present invention;

FIG. 16 is a schematic view of a dual-cavity cross-section tube in accordance with an embodiment of the present invention;

FIG. 17 is a schematic view of a three-cavity cross-section tube in accordance with an embodiment of the present invention;

FIG. 18 is a schematic view of a tube with a four-chamber cross section according to an embodiment of the present invention;

FIG. 19 is a schematic view of the structure of a pipe fitting after extrusion processing according to the embodiment of the invention;

fig. 20 is a schematic structural view of a pipe after bending and forming according to an embodiment of the present invention.

Reference numerals illustrate:

1-pipe fitting, 11-flat surface, 12-positioning hole, 21-female die, 211-cavity groove, 22-male die, 221-positioning boss, 2211-boss, 2211 a-overflow prevention groove, 2212-positioning pin, 2212 a-air passage, 2212 b-chamfer, 2213-reinforcing rib forming groove, 23-core pulling slide block, 3-die casting, 31-reinforcing rib and 32-shadow area.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present invention, it should be understood that, if there are terms "upper", "lower", "front", "rear", "left", "right", the indicated orientation or positional relationship is based on that shown in the drawings, only for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, in the description of the present invention, the Z axis in the drawings represents a vertical direction, that is, an up-down position, and the forward direction of the Z axis represents an upper direction, and correspondingly, the reverse direction of the Z axis represents a lower direction, it should be noted that the foregoing meaning of the Z axis is merely for convenience in describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in fig. 1, an embodiment of the present invention provides a die casting method, including:

and step S10, sealing the two ends of the pipe fitting 1 with the cavity and placing the pipe fitting into a die cavity of a die casting die.

The sealing treatment may be performed before the tube 1 is placed in the die cavity, for example, before the tube 1 is placed in the die cavity, end plates may be installed at both ends of the tube 1 to seal the tube 1, and the end plates may be installed by welding; the sealing treatment may also be performed after being put into the cavity, for example, by plugging both end openings of the pipe member 1 by the core-pulling sliders 23 of the mold after being put into the cavity to seal the pipe member 1.

And step S20, pressing a molten die casting material into a die cavity, and obtaining a die casting 3 through die casting.

After the die casting 3 is obtained by die casting, the die casting 3 can be kept in the die for a period of time, and then the die is opened, and the die casting 3 is grabbed by a manipulator.

In this embodiment, the two ends of the pipe fitting 1 with the cavity are sealed and placed in the cavity of the die-casting mold, for example, the die-casting mold may be opened to be in a die-opened state (refer to fig. 2 specifically), then the pipe fitting 1 is placed on the male die 22 of the die-casting mold, and after positioning, the die-casting mold is closed (refer to fig. 3 specifically) to place the pipe fitting 1 in the cavity, wherein the pipe fitting 1 in the cavity may be used as a base for solidifying the die-casting material to form the cavity. In addition, the pipe member 1 is usually open at both ends, and the cavity of the pipe member 1 may be sealed by, for example, attaching end plates or by a mold closing the open ends. Then, the molten die casting material is pressed into the cavity, and the die casting is performed to obtain a die casting 3 (see fig. 4). In the above-mentioned die casting process, because the pipe fitting 1 with the cavity is placed in the die cavity itself, and the both ends of pipe fitting 1 are sealed, after the die casting material of molten state is pressed into, the die casting material can surround pipe fitting 1 rapidly, and can not get into in the cavity of pipe fitting 1, can form a cavity with pipe fitting 1 shape adaptation after the die casting material solidifies, namely, final die casting 3 inside contains pipe fitting 1 that has the cavity, and be equivalent to forming a cavity that surrounds pipe fitting 1 outside pipe fitting 1, in this way, through pipe fitting 1 and cavity, can promote die casting 3's bending torsion resistance and shock resistance, make need not to set up too much strengthening rib 31, thereby improve the cracked problem of mould internal mold core, improve the mould life-span, reduce manufacturing cost.

Optionally, before sealing the two ends of the pipe fitting 1 with the cavity and placing the pipe fitting in the cavity of the die casting mold, the method further comprises:

step S03, preheating the die-casting die, and spraying a release agent on the cavity surface of the die cavity.

The mold release agent is a conventional processing agent in the art, and the specific type thereof is not limited here.

In the embodiment, the mold is preheated in advance before the pipe fitting 1 is put in, so that the cold and hot temperature stress generated after the molten die casting material is pressed in can be reduced, and the service life of the mold is prolonged; by spraying the release agent in advance, the die casting 3 can be smoothly separated from the die after being molded, and the surface smoothness of the die casting 3 is ensured.

Optionally, after sealing the two ends of the pipe fitting 1 with the cavity and placing the pipe fitting in the cavity of the die casting mold, the molten die casting material is pressed into the cavity, and before the die casting 3 is obtained, the method further comprises:

and S11, sealing the die-casting die, and then pumping out air in the die cavity.

Specifically, the male die 22 and the female die 21 of the die casting die can be clamped by a high-pressure vacuum die casting device, a sufficiently strong clamping force is provided to realize die sealing, and then air in the die cavity is pumped out by a vacuum pumping device.

If the air in the die cavity is not pumped out, the air in the die cavity is not discharged until the air is involved in the die casting material, and air holes are formed in the die casting 3 after solidification.

Optionally, after the molten die casting material is pressed into the die cavity and die casting is performed, the method further includes: excess material on the die casting 3 is removed by the trimming die and sawing system. The excess material may be the material of the shaded area 32 shown in fig. 5, resulting in a die cast 3 after removal of material as shown in fig. 6 and 7.

Optionally, after the molten die casting material is pressed into the die cavity and die casting is performed, the method further includes:

and step S30, performing heat treatment on the die casting 3.

The specific heat treatment method is not limited, and may be annealing, normalizing, quenching, tempering, aging, etc.

In this embodiment, the die casting 3 formed by die casting is subjected to heat treatment, so that the mechanical properties of the die casting 3 can be enhanced by a heat treatment method according to the actual product requirements, so as to meet the different product differentiation requirements.

Alternatively, referring to fig. 2 and 4 in combination, the die casting mold includes a female mold 21 and a male mold 22, the bottom surface of the female mold 21 is provided with a cavity groove 211 having a downward notch, and when the top surface of the male mold 22 is connected to the bottom surface of the female mold 21, the lower notch of the cavity groove 211 is closed by the top surface of the male mold 22 to form a cavity.

Specifically, referring to fig. 2 and 4, the die casting mold further includes two core-pulling sliders 23, and when two ends of the pipe fitting 1 are sealed by adopting a mold to seal openings at two ends, the two core-pulling sliders 23 can be correspondingly plugged into the openings at two ends of the pipe fitting 1 after the pipe fitting 1 is placed into the die cavity. At this point, the die casting 3 that is finally formed has an open cavity, i.e. the tube 1 is visible from outside the die casting 3.

In other embodiments, the die casting mold may not include the core pulling slide 23, and when the two ends of the pipe fitting 1 are sealed by means of installing end plates, the end plates may be directly installed at the openings of the two ends of the pipe fitting 1 before the pipe fitting 1 is put into the die cavity. At this time, the die casting 3 finally formed has a closed cavity (see fig. 8 and 9), i.e., the pipe member 1 is not visible from the outside of the die casting 3.

In this embodiment, the die casting mold includes the female mold 21 and the male mold 22, when die casting is required, the pipe fitting 1 is placed on the male mold 22, then the top surface of the male mold 22 is connected with the bottom surface of the female mold 21, and the pipe fitting 1 can be limited in the cavity groove 211, that is, the pipe fitting 1 is limited in the cavity, so that the die casting mold has a simple structure, and the die casting 21 and the male mold 22 are convenient to mold.

Alternatively, referring to fig. 10 to 13, the outer tube wall of the tube member 1 is provided with a flat surface 11, and the flat surface 11 is provided with a positioning hole 12; a positioning boss 221 is arranged on the top surface of the male die 22, a positioning plane is arranged at the upper end of the positioning boss 221, and a positioning pin 2212 is arranged on the positioning plane; after the pipe fitting 1 is placed in the die cavity, the flat surface 11 is attached to the positioning plane, and the positioning holes 12 are matched with the pin holes of the positioning pins 2212.

The upper end of the positioning boss 221 means that the positioning boss 221 is located at the upper end in the up-down direction, i.e., the positioning boss 221 is located at the end in the forward direction of the Z-axis direction shown in fig. 2. The positioning plane may be arranged in various manners, for example, the upper end surface of the positioning boss 221 is arranged as a plane, and the plane can be used as a positioning plane, and accordingly, the arrangement position of the positioning pin 2212 may be any position on the upper end surface of the positioning boss 221; for another example, referring specifically to fig. 11 to 13, three protruding portions 2211 are protruding from the upper end of the positioning boss 221, the upper end surfaces of the three protruding portions 2211 are all configured as a plane, and the upper end surfaces of the three protruding portions 2211 are configured in a coplanar manner, so that the upper end surfaces of the three protruding portions 2211 together form the positioning plane, and accordingly, when positioning pins 2212 are configured, the positioning pins 2212 may be respectively configured on the upper end surfaces of one of the protruding portions 2211 correspondingly; of course, other forms are possible and are not limited herein. It should be noted that the number of the positioning holes 12 and the positioning pins 2212 is not limited, and may be one or more, and for example, referring to fig. 10 to 12, two positioning holes 12 and two positioning pins 2212 may be provided.

In this embodiment, the fitting of the flat surface 11 and the positioning plane and the matching of the positioning hole 12 and the positioning pin 2212 are utilized to realize the positioning of the pipe fitting 1 on the positioning boss 221, so that the positioning effect is good, the pipe fitting 1 is not easy to move under the impact of the die casting material, and the casting quality of the die casting 3 is improved.

Alternatively, referring to fig. 14, an air passage 2212a is provided in the positioning pin 2212, the air passage 2212a extends in the axial direction of the positioning pin 2212, one end of the air passage 2212a is provided through the upper end surface of the positioning pin 2212, and the other end is provided through the bottom surface of the punch 22; and/or, the edge of the upper end surface of the positioning pin 2212 is provided with a chamfer 2212b; and/or, the positioning plane is provided with an overflow stopping groove 2211a, and the overflow stopping groove 2211a is circumferentially arranged along the circumferential direction of the positioning pin 2212; and/or, the upper end surface of the positioning boss 221 is concavely formed with a plurality of reinforcing-rib forming grooves 2213.

A spill-proof groove 2211a is formed on the positioning plane, specifically, the spill-proof groove 2211a can be formed on the upper end surface of the convex portion 2211 where the positioning pin 2212 is positioned; the bead-forming groove 2213 refers to a groove for forming the bead 31, and specifically, after pressing a die casting material into a cavity, the die casting material may flow into the bead-forming groove 2213, and after solidification, may become the bead 31 on the die casting 3 (see fig. 7 and 9 for a portion of the bead 31). It should be noted that, the relevant technical features of the air passage 2212a, the chamfer 2212b, the overflow stop groove 2211a and the reinforcing rib forming groove 2213 may be alternatively or alternatively arranged, or alternatively or simultaneously arranged, which is not limited in the present invention.

In this embodiment, by disposing the air passage 2212a in the positioning pin 2212, the air passage 2212a can discharge part of air in the pipe fitting 1 before performing open cavity die casting (the die casting piece obtained by die casting has an open cavity), so that the inside of the die cavity is in a high vacuum state, and the air hole defect is reduced; the air passage 2212a can be used as an exhaust passage of gas in a die cavity in the process of die casting with a closed cavity (die casting piece with the closed cavity), so that the quality influence of high temperature on the thermal deformation of the pipe fitting 1 in the die casting process is reduced. By providing the chamfer 2212b at the edge of the upper end surface of the positioning pin 2212, the process of positioning the pipe fitting 1 to the positioning boss 221 is guided, and the operation convenience is improved. By arranging the overflow stop groove 2211a, the overflow stop groove 2211a mainly aims to avoid the possible gap after the flat surface 11 is attached to the positioning plane, and a small amount of die casting materials can be collected and blocked from entering the pipe fitting 1 by using the overflow stop groove 2211a, so that the vacuum degree in a die cavity is improved, and the die casting quality is improved; meanwhile, the positioning plane is used for being attached to the flat surface 11, the positioning plane has positioning and sealing functions, and after being combined with the overflow stop groove 2211a, the sealing function on the pipe fitting 1 can be further improved, and the die casting quality is improved. By arranging the reinforcing rib forming grooves 2213, the reinforcing ribs 31 are formed on the surface of the die casting 3, and the strength of the die casting 3 is improved.

Optionally, the pipe fitting 1 is made of aluminum alloy, and the die casting material is made of aluminum alloy. In this embodiment, through setting up pipe fitting 1 material into the aluminum alloy, set up the die casting material into the aluminum alloy, pipe fitting 1 and die casting material are the aluminum product material together, can avoid taking place electrochemical corrosion when die casting. Preferably, the pipe fitting 1 is made of 6 series aluminum alloy, the 6 series aluminum alloy is also called as aluminum magnesium silicon alloy, the strength is higher, and the strength reinforcing effect on the die casting 3 is better.

Optionally, before sealing the two ends of the pipe fitting 1 with the cavity and placing the pipe fitting in the cavity of the die casting mold, the method further comprises:

step S01, heating and softening the raw material of the pipe fitting 1, and then performing extrusion molding processing to obtain the pipe fitting 1.

It should be noted that, when the extrusion dies selected in the extrusion process are different, the cross-sectional shapes of the obtained pipe fitting 1 are different, for example, a single-cavity cross-sectional pipe fitting (see fig. 15), a double-cavity cross-sectional pipe fitting (see fig. 16), a three-cavity cross-sectional pipe fitting (see fig. 17) and a four-cavity cross-sectional pipe fitting (see fig. 18) may be extruded according to the requirements. After step S01, the resulting tube 1 is in a straight line (see fig. 19).

In this embodiment, the pipe fitting 1 is obtained by heating, softening and then extrusion molding, that is, the pipe fitting 1 is an extrusion profile, and the extrusion aluminum profile has good toughness, is easy to absorb energy, and is more beneficial to improving the strength of the die casting 3.

Optionally, after the pipe fitting raw material is heated and softened and then is subjected to extrusion molding treatment to obtain the pipe fitting 1, before the two ends of the pipe fitting 1 with the cavity are sealed and placed in the die cavity of the die casting die, the die further comprises:

step S02, bending the pipe 1.

After step S02, the pipe member 1 is changed from the straight state to the bent state (see fig. 20). The bending process may be planar two-dimensional bending or spatial three-dimensional bending, and the specific bending method is not limited herein. When the pipe fitting 1 is subjected to planar two-dimensional bending molding, the envelope of the hand piece can be avoided, and the structural design requirement is met; on the other hand, the NVH (Noise, vibration, harshness noise, vibration and harshness) performance of the die casting 3 (such as a die casting auxiliary frame) can be greatly improved. When the pipe fitting 1 is subjected to space three-dimensional bending molding, the structural design can be carried out according to more complex avoidance requirements, and the performances such as local strength and the like are improved.

In this embodiment, through carrying out bending forming processing to pipe fitting 1, can make it take place bending deformation, adapt to comparatively complicated all kinds of die casting products, the application scene is extensive.

The embodiment of the invention also provides a die-casting forming method, which comprises the following specific steps:

and S01, heating and softening the pipe fitting raw material, and then performing extrusion molding processing to obtain the pipe fitting 1.

Step S02, bending the pipe 1.

Step S03, preheating the die-casting die, and spraying a release agent on the cavity surface of the die cavity.

Step S10, sealing two ends of a pipe fitting 1 with a cavity and placing the pipe fitting into a die cavity of a die casting die, wherein the die casting die comprises a female die 21 and a male die 22, a cavity groove 211 with a downward notch is arranged on the bottom surface of the female die 21, and when the top surface of the male die 22 is connected to the bottom surface of the female die 21, the lower notch of the cavity groove 211 is closed by the top surface of the male die 22 to form the die cavity; the outer pipe wall of the pipe fitting 1 is provided with a flat surface 11, and the flat surface 11 is provided with a positioning hole 12; a positioning boss 221 is arranged on the top surface of the male die 22, a positioning plane is arranged at the upper end of the positioning boss 221, and a positioning pin 2212 is arranged on the positioning plane; after the pipe fitting 1 is placed in the die cavity, the flat surface 11 is attached to the positioning plane, and the positioning holes 12 are matched with the pin holes of the positioning pins 2212; an air passage 2212a is arranged in the positioning pin 2212, the air passage 2212a extends along the axial direction of the positioning pin 2212, one end of the air passage 2212a penetrates through the upper end surface of the positioning pin 2212, and the other end penetrates through the bottom surface of the male die 22; the edge of the upper end surface of the positioning pin 2212 is provided with a chamfer 2212b; the positioning plane is provided with an overflow stopping groove 2211a, and the overflow stopping groove 2211a is circumferentially arranged along the circumferential direction of the positioning pin 2212; the upper end surface of the positioning boss 221 is concavely formed with a plurality of reinforcing-rib forming grooves 2213.

And S11, sealing the die-casting die, and then pumping out air in the die cavity.

And step S20, pressing a molten die casting material into a die cavity, and obtaining a die casting 3 through die casting.

And step S30, performing heat treatment on the die casting 3.

In this embodiment, the die casting method includes two major parts, the first part is the processing procedure of the pipe fitting 1, and the second part is the processing procedure of the die casting 3. Wherein the first part is mainly: firstly, extruding raw materials of the pipe fitting 1 to obtain a required pipe fitting 1, and then further bending the pipe fitting 1 to obtain a bent extruded pipe fitting 1, so that the pipe fitting 1 is an extruded profile, the toughness of the extruded aluminum profile is good, energy absorption is easy, the strength of the die casting 3 is improved, and meanwhile, the pipe fitting 1 in a bent shape can adapt to various complicated die casting products and has wide application scenes. The second part is mainly: firstly preheating a die casting die and spraying a release agent, then placing a pipe fitting 1 into a die cavity of the die casting die which is preheated and sprayed with the release agent, sealing the die casting die and pumping air in the die cavity, pressing into a molten die casting material to obtain a die casting 3, and then performing heat treatment on the die casting 3 to finally obtain the die casting 3, wherein the pipe fitting 1 with a cavity is placed in the die cavity, two ends of the pipe fitting 1 are sealed, after the molten die casting material is pressed in, the die casting material rapidly surrounds the pipe fitting 1 and does not enter the cavity of the pipe fitting 1, a cavity matched with the shape of the pipe fitting 1 is formed after the die casting material is solidified, namely, the final die casting 3 internally comprises the pipe fitting 1 with the cavity, and the cavity surrounding the pipe fitting 1 is formed outside the pipe fitting 1, so that the bending and torsion resistance and the impact resistance of the die casting 3 can be improved through the pipe fitting 1 and the cavity, the problem of die core fracture of the die is solved, the service life of the die is prolonged, and the production cost is reduced; meanwhile, after the die is preheated, cold and hot temperature stress generated after the die casting material in a molten state is pressed in can be reduced, the service life of the die is prolonged, the die casting 3 can be smoothly separated from the die after being sprayed with the release agent, and the surface smoothness of the die casting 3 is ensured; in addition, the vacuum degree in the die cavity can be ensured by pumping out the air in the die cavity, so that the air hole defect in the die casting process is reduced; and the mechanical property of the die casting 3 can be enhanced by a heat treatment method so as to meet the different product differentiation requirements.

The embodiment of the invention also provides a die casting, which is manufactured by adopting the die casting molding method. The die castings can be an instrument board beam, a chassis auxiliary frame, an automobile front cabin, an automobile rear cabin, an automobile front longitudinal beam, an automobile rear longitudinal beam, a battery shell and the like in automobile manufacture. Since the die casting is manufactured by the die casting molding method, the die casting has the beneficial effects brought by all the embodiments, and the description is omitted herein.

In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "provided" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present invention, the meaning of the term "and/or" includes three parallel schemes, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme that is satisfied by a and B simultaneously.

Furthermore, in the description of the present invention, the term "embodiment" or "an embodiment" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment or implementation of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.

Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. A die casting method, comprising:

sealing two ends of a pipe fitting (1) with a cavity and placing the pipe fitting into a die cavity of a die casting die;

and pressing a molten die casting material into the die cavity, and performing die casting to obtain a die casting (3).

2. The die casting method according to claim 1, wherein before sealing both ends of the tube (1) with the cavity and placing the tube in the cavity of the die casting mold, the die casting method further comprises:

preheating the die casting die, and spraying a release agent on the cavity surface of the die cavity.

3. The method according to claim 1, wherein after sealing both ends of the tube (1) with the cavity and placing the tube in the cavity of the die casting mold, the method further comprises, before pressing the molten die casting material into the cavity and obtaining the die casting (3):

and sealing the die casting die, and then pumping out air in the die cavity.

4. The die casting method according to claim 1, wherein after the die casting material in a molten state is pressed into the die cavity and die-cast, a die cast (3) is obtained, further comprising:

and (3) heat treating the die casting.

5. The die casting method according to claim 1, characterized in that the die casting mold comprises a female mold (21) and a male mold (22), a bottom surface of the female mold (21) is provided with a cavity groove (211) with a notch facing downward, and when a top surface of the male mold (22) is attached to the bottom surface of the female mold (21), a lower notch of the cavity groove (211) is closed by the top surface of the male mold (22) to form the cavity.

6. The die casting method according to claim 5, characterized in that the outer tube wall of the tube member (1) is provided with a flat surface (11), the flat surface (11) being provided with a positioning hole (12);

a positioning boss (221) is arranged on the top surface of the male die (22), a positioning plane is arranged at the upper end of the positioning boss (221), and a positioning pin (2212) is arranged on the positioning plane;

after the pipe fitting (1) is placed in the die cavity, the flat surface (11) is attached to the positioning plane, and the positioning hole (12) is matched with the pin hole of the positioning pin (2212).

7. The die casting method as claimed in claim 6, wherein an air passage (2212 a) is provided in the positioning pin (2212), the air passage (2212 a) extends in the axial direction of the positioning pin (2212), one end of the air passage (2212 a) is provided through an upper end face of the positioning pin (2212), and the other end is provided through a bottom face of the male die (22); and/or the number of the groups of groups,

the edge of the upper end surface of the positioning pin (2212) is provided with a chamfer (2212 b); and/or the number of the groups of groups,

the positioning plane is provided with an overflow stopping groove (2211 a), and the overflow stopping groove (2211 a) is circumferentially arranged along the circumferential direction of the positioning pin (2212); and/or the number of the groups of groups,

a plurality of reinforcing rib forming grooves (2213) are concavely formed on the upper end surface of the positioning boss (221).

8. The die casting method according to claim 1, wherein before sealing both ends of the tube (1) with the cavity and placing the tube in the cavity of the die casting mold, the die casting method further comprises:

heating and softening the pipe raw material, and then performing extrusion molding processing to obtain the pipe (1).

9. The die casting method according to claim 8, wherein after the pipe member raw material is heated and softened and then subjected to the extrusion molding process to obtain the pipe member (1), before the both ends of the pipe member (1) with the cavity are sealed and placed in the cavity of the die casting die, further comprising:

and bending the pipe fitting (1).

10. A die casting produced by the die casting method according to any one of claims 1 to 9.