Pouring system of deep-cavity magnesium alloy die-casting die

Abstract

The pouring system of the deep-cavity magnesium alloy die-casting die comprises at least one pouring system unit, each pouring system unit comprises a forming casting, a first exhaust structure, a straight pouring gate and a transverse pouring gate, and the straight pouring gates and the transverse pouring gates are communicated in sequence. The forming casting comprises a main base and a protruding structure, the protruding structure is located between the two ends of the main base, and the main base and the protruding structure are of an integrally-formed structure. The cross gate is communicated with the side surface of the main base; the convex structure comprises a front part and a rear part, a junction surface is arranged between the front part and the rear part, the junction surface forms a boundary line at the top end of the convex structure, and the first exhaust structure is arranged at the boundary line. Compared with the prior art, the pouring system of the deep-cavity magnesium alloy die-casting die is smooth in exhaust when a deep cavity is filled with magnesium alloy metal liquid, cold materials and cracks can be prevented from appearing on the surface of a final product, and therefore the satisfaction degree of customers to the product is improved.

Description

Technical Field

[0001] This utility model relates to the field of die casting molds, and more particularly to the gating system of magnesium alloy die casting molds. Background Technology

[0002] With the continuous development of the automotive industry, the demand for automobiles is increasing. Whether it's new energy vehicles or gasoline vehicles, while ensuring quality and cost, vehicles are increasingly leaning towards lightweight design. Currently, most screen brackets or center console panels in automobiles are made of magnesium alloy die casting because magnesium alloy is lighter than aluminum alloy, has a wider range of applications, and offers an overall cost advantage. However, magnesium alloy castings not only have high requirements for the product's structure but also for the flow and venting of molten metal. Depending on the shape of the screen bracket or center console panel, the magnesium alloy casting structure generally includes a main base and a raised structure located in the center of the main base. The gating system of the magnesium alloy die casting mold is generally connected to the side of the main base, and the height of the raised structure is 6-8 times the wall thickness of the main base. This structure results in deep cavities in the mold, making it difficult for the molten magnesium alloy to reach the edges of the raised structure. In addition, since molds generally include a moving mold and a fixed mold, the aforementioned protruding structure is also divided into two parts from the middle of the edge. It is very difficult to vent air at the joint surface of the two parts of the protruding structure, so dead corners are formed at the edge of the joint surface. The existence of dead corners not only hinders the flow of molten metal, but also makes it difficult for gas in the mold cavity to be discharged, resulting in cold material and cracks on the surface of magnesium alloy castings, which in turn leads to the scrapping of the final product or customer complaints about product defects.

[0003] Therefore, it is necessary to design a gating system for a deep-cavity magnesium alloy die-casting mold to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a gating system for a deep cavity magnesium alloy die casting mold, which allows for smooth venting and prevents cold material and cracks from forming on the surface of the product after molding.

[0005] To achieve the above objectives, the gating system of the deep cavity magnesium alloy die-casting mold provided by this utility model includes at least one gating system unit. The gating system unit includes a molded casting, a first venting structure, and a sprue and a runner connected in sequence. The molded casting includes a main base and a raised structure. The raised structure is located between the two ends of the main base, and the main base and the raised structure are integrally formed. The runner is connected to the side of the main base. The raised structure includes a front part and a rear part, and there is a mating surface between the front part and the rear part. The mating surface forms a dividing line at the top of the raised structure, and the first venting structure is disposed at the dividing line.

[0006] Compared with existing technologies, the gating system of this utility model for deep cavity magnesium alloy die casting molds, by setting the first venting structure at the dividing line at the top of the protruding structure of the molded casting, allows the gas in the molten magnesium alloy to be smoothly discharged when filling the deep cavity corresponding to the protruding structure. This ensures that the molten magnesium alloy can smoothly and fully fill the deep cavity corresponding to the protruding structure, avoiding cold material and cracks on the surface of the final product, and improving customer satisfaction. In addition, the presence of the first venting structure can ensure complete filling of the molten magnesium alloy while reasonably reducing the injection pressure, thereby reducing energy consumption and overflow, and thus saving costs.

[0007] Specifically, the first venting structure includes two venting channels, which are respectively connected to the edges at both ends of the dividing line. This arrangement facilitates the balancing of the pressure on the molten magnesium alloy during filling while ensuring sufficient venting, thus ensuring uniform stress on all parts of the molten magnesium alloy during filling and reducing casting defects caused by uneven stress.

[0008] Specifically, the casting system unit further includes several overflow channels for containing excess molten metal. These overflow channels are connected to the side of the main base and are interconnected. This arrangement allows for the recovery of overflowing magnesium alloy molten metal, saving costs. Furthermore, the presence of the overflow channels facilitates venting of the magnesium alloy molten metal, reducing casting defects.

[0009] Specifically, the casting system unit further includes a second venting structure, one end of which is connected to the overflow groove.

[0010] Specifically, the second venting structure has a wave-plate venting structure between its two ends. This wave-plate venting structure has multiple surface recesses arranged in a wave-like pattern along the venting direction. This design gradually reduces the filling speed of the molten magnesium alloy and causes it to accumulate at the wave-plate venting structure, acting as a slag trap. Simultaneously, it controls the outflow of molten magnesium alloy, preventing gas from directly exiting from the mold edge, eliminating overflow and slag flying, and ensuring product height.

[0011] Specifically, the transition gap between two adjacent surface recesses is a sinusoidal waveform. This design improves the exhaust performance.

[0012] Specifically, the cross-section of the horizontal sprue is a rounded trapezoid, and the cross-section of the vertical sprue is circular, with the vertical sprue also being a frustum shape, smaller at the top and larger at the bottom. This design reduces the resistance encountered by the molten magnesium alloy during flow, making the flow smoother, reducing turbulence and eddies, and also assisting in venting.

[0013] Specifically, the cross-sectional area of ​​the horizontal sprue is smaller than that of the vertical sprue. This design facilitates rapid filling of the magnesium alloy molten metal.

[0014] Specifically, an ingate is provided between the end of the horizontal runner and the side of the main base facing the horizontal runner, with a multi-stage bend transition between the end of the horizontal runner and the ingate. This design helps reduce the impact of molten magnesium alloy flowing from the horizontal runner into the ingate, avoiding eddies and gas entrainment caused by sharp turns, thereby reducing casting defects. In addition, the multi-stage bend transition design helps separate slag, sand particles, and other inclusions mixed in the molten magnesium alloy, improving the slag-blocking effect.

[0015] Specifically, the cross-sectional area of ​​the ingate is smaller than that of the runner, and the height of the ingate is one-sixth to one-fifth of the height of the runner. This arrangement allows more slag and inclusions to separate in the runner, reducing the possibility of impurities entering the ingate. Attached Figure Description

[0016] Figure 1 This is a perspective view of the gating system of the deep cavity magnesium alloy die-casting mold of this utility model.

[0017] Figure 2 yes Figure 1 The enlarged view at point A shows the front, rear, and dividing line of the first exhaust structure and the protruding structure.

[0018] Figure 3 yes Figure 1 The enlarged view at point B shows the surface recess structure and transition gap of the second exhaust structure.

[0019] Figure 4 This is a top view of the gating system of the deep cavity magnesium alloy die-casting mold of this utility model, which includes the sprue, runner, and ingate.

[0020] Figure 5 This is a rear view of the gating system of the deep cavity magnesium alloy die-casting mold of this utility model, which includes the sprue, runner, and ingate.

[0021] Figure 6 yes Figure 4 The 3D view of the CC section view after being rotated at a certain angle shows the cross-section of the horizontal runner.

[0022] Figure 7 yes Figure 4 The 3D view of the DD section view after being rotated at a certain angle shows the cross-section of the branch runner of the horizontal runner. Detailed Implementation

[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to specific embodiments and accompanying drawings, and the technical solutions of this utility model will be explained. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0024] Please see Figures 1-2 The gating system 100 of the deep cavity magnesium alloy die casting mold provided by this utility model includes at least one gating system unit 101. The gating system unit 101 includes a molded casting 1, a first venting structure 2, and a sprue 3 and a runner 4 connected in sequence. The molded casting 1 includes a main base 11 and a protruding structure 12. The protruding structure 12 is located between the two ends of the main base 11, and the main base 11 and the protruding structure 12 are integrally formed. The runner 3 is connected to the side of the main base 11. The protruding structure 12 includes a front part 121 and a rear part 122. The front part 121 and the rear part 122 have a mating surface (not shown in the figure). The mating surface forms a dividing line 123 at the top of the protruding structure 11. The first venting structure 2 is disposed at the dividing line 123. In this embodiment, the gating system 100 of the deep cavity magnesium alloy die casting mold has two gating system units 101, and thus the end of the horizontal runner 4 connected to the sprue 3 has two branch runners 41 to facilitate the simultaneous filling of the two gating system units 101 with magnesium alloy molten metal.

[0025] Please see again Figure 2 In order to balance the pressure on the magnesium alloy molten metal during filling while fully venting the gas, so that the magnesium alloy molten metal is subjected to uniform force in each part during filling and to reduce casting defects caused by uneven force, the first venting structure 2 includes two venting channels 21, which are respectively connected to the edges of the two ends of the dividing line 123.

[0026] Further, please refer to Figures 4-7 The cross-sections of both the horizontal gating system 4 and the branch gating system 41 are rounded trapezoids, meaning a trapezoid with rounded corners at all four corners. The sprue 3 has a circular cross-section and is shaped like a frustum, wider at the bottom than the top. This design reduces resistance to the flow of molten magnesium alloy, resulting in smoother flow, reduced turbulence and eddies, and also aids in venting. Furthermore, to facilitate rapid filling of the molten magnesium alloy, the cross-sectional area of ​​the horizontal gating system 4 is smaller than that of the sprue 3.

[0027] Please refer to the figure for further details. Figure 4 and Figure 5An ingate 5 is provided between the end of the horizontal sprue 4 and the side of the main base 11 facing the horizontal sprue 4, with a multi-stage bend transition between the end of the horizontal sprue 4 and the ingate 5. This design helps reduce the impact of molten magnesium alloy flowing from the horizontal sprue 4 into the ingate 5, avoiding eddies and gas entrainment caused by sharp turns, thereby reducing casting defects. In addition, the multi-stage bend transition design helps separate slag, sand particles, and other inclusions mixed in the molten magnesium alloy, improving the slag-blocking effect. In this embodiment, the cross-sectional area of ​​the ingate 5 is smaller than that of the horizontal sprue 4, and the height of the ingate 5 is one-sixth to one-fifth of the height of the horizontal sprue 4. This design allows more slag and inclusions to separate in the horizontal sprue 4, reducing the possibility of impurities entering the ingate 5. Furthermore, to ensure sufficient filling of the molten magnesium alloy, the ingate 5 is also divided into two streams and connected to both ends of the side of the main base 11.

[0028] Further, please refer to Figure 1 The casting system unit 101 further includes several overflow channels 6 for containing excess molten metal. These overflow channels 6 are connected to the side of the main base 11 and are interconnected. This arrangement allows for the recovery of overflowing magnesium alloy molten metal, saving costs. Furthermore, the presence of the overflow channels 6 further facilitates the venting of the magnesium alloy molten metal, reducing casting defects.

[0029] Further, please refer to Figure 1 and Figure 3 The casting system unit 101 further includes a second venting structure 7, one end of which is connected to the overflow groove 6. Specifically, the two ends of the second venting structure 7 are flat venting channels 70, and the two ends of the second venting structure 7 are connected by a corrugated plate venting structure 71. The corrugated plate venting structure 71 has multiple surface recesses 711, which are repeatedly arranged along the venting direction to form a wave shape. This arrangement can gradually reduce the filling speed of the magnesium alloy molten metal and form an accumulation at the corrugated plate venting structure 71, acting as a slag bag, while controlling the outflow of magnesium alloy molten metal, avoiding overflow and flying material phenomena caused by high-speed gas ejection, and ensuring product height. In this embodiment, the transition gap 712 between two adjacent surface recesses 711 is a sinusoidal waveform. In addition, each casting system unit 101 is provided with three second venting structures 7. This arrangement makes the venting effect better.

[0030] The following is a description of the working principle of the gating system 100 of the deep cavity magnesium alloy die casting mold of this utility model. Molten magnesium alloy enters through the sprue 3, and then through the gating 4 and the ingate 5 to fill the molded casting 1. The molten magnesium alloy first fills the main base 11 and then gradually fills the raised structure 12. As the molten magnesium alloy continues to be input, the molded casting 1 is gradually filled and formed. Gas in the molten magnesium alloy is gradually discharged to the external environment by the first venting structure 2 and the second venting structure 7. After the molded casting 1 is completely formed, excess molten magnesium alloy remains in each of the overflow grooves 6.

[0031] Compared with existing technologies, the gating system 100 of the deep cavity magnesium alloy die-casting mold of this utility model provides a first venting structure 2 at the dividing line 123 at the top of the protruding structure 11 of the molded casting 1. This allows the gas in the molten magnesium alloy to be smoothly discharged when filling the deep cavity corresponding to the protruding structure 11, thus ensuring that the molten magnesium alloy can smoothly and fully fill the deep cavity corresponding to the protruding structure 11. This avoids cold material and cracks on the surface of the final product, improving customer satisfaction. In addition, the presence of the first venting structure 2 can ensure complete filling of the molten magnesium alloy while reasonably reducing the injection pressure, thereby reducing energy consumption and overflow, and ultimately saving costs.

[0032] The above-disclosed embodiments are merely preferred embodiments of the present invention. These embodiments are illustrative only and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the protection scope of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the claims of the present invention and remain within the scope of the present invention.

Claims

1. A gating system for a deep-cavity magnesium alloy die-casting mold, characterized in that, The system includes at least one gating system unit, which comprises a molded casting, a first venting structure, and a sprue and a runner connected in sequence. The molded casting includes a main base and a raised structure, the raised structure being located between the two ends of the main base and the main base and the raised structure being integrally formed. The runner is connected to the side of the main base. The raised structure includes a front part and a rear part, with a mating surface between the front part and the rear part. The mating surface forms a dividing line at the top of the raised structure, and the first venting structure is disposed at the dividing line.

2. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 1, characterized in that, The first exhaust structure includes two exhaust channels, which are respectively connected to the edges at both ends of the dividing line.

3. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 1, characterized in that, The casting system unit also includes several overflow channels for containing excess molten metal, and the overflow channels are connected to the side of the main base and are interconnected with each other.

4. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 3, characterized in that, The casting system unit also includes a second venting structure, one end of which is connected to the overflow groove.

5. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 4, characterized in that, Between the two ends of the second exhaust structure is a wave plate exhaust structure, which has multiple surface recesses, and the multiple surface recesses are repeatedly arranged along the exhaust direction to form a wave shape.

6. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 5, characterized in that, The transition gap between two adjacent surface recess structures is a sinusoidal waveform.

7. The gating system for a deep-cavity magnesium alloy die-casting mold as described in claim 1, characterized in that, The cross-section of the horizontal gating system is a rounded trapezoid, and the cross-section of the vertical gating system is circular and the vertical gating system is a frustum-shaped structure that is smaller at the top and larger at the bottom.

8. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 1, characterized in that, The cross-sectional area of ​​the horizontal runner is smaller than that of the vertical runner.

9. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 1, characterized in that, An inner gating system is provided between the end of the horizontal gating and the side of the main base facing the horizontal gating, and the end of the horizontal gating and the inner gating have a multi-segmented, curved transition.

10. The gating system of the deep cavity magnesium alloy die-casting mold as described in claim 9, characterized in that, The cross-sectional area of ​​the ingate is smaller than that of the runner, and the height of the ingate is one-sixth to one-fifth of the height of the runner.

Images