Cam shaft tile cover die-casting die casting system

Abstract

The invention discloses a cam shaft tile cover die-casting die pouring system which comprises a die body, a main pouring gate horizontally and linearly extending is arranged on the die body, sub-runners are arranged on the two sides of the main pouring gate, and the feeding ends of the sub-runners communicate with the main pouring gate; the main pouring gate comprises four feeding sections, and the four feeding sections are a first-section main pouring gate body, a second-section main pouring gate body, a third-section main pouring gate body and a fourth-section main pouring gate body which are linearly and sequentially connected in the feeding direction; the sectional areas of the first, second, third and fourth sections of main pouring gates are sequentially reduced; the two sides of each feeding section are each provided with a sub-runner, and the sectional area of the feeding end of each sub-runner is smaller than that of the four main pouring gates. The technical scheme of the invention has the remarkable effects that the magnesium liquid can almost simultaneously reach the mold cavity / cavity through the pouring system under the acceleration action of the main pouring gate on the magnesium liquid, so that the feeding synchronism of the mold cavity during one-mold multi-cavity pressure casting is improved, and more reliable guarantee is provided for ensuring the quality stability during pressure casting of a large number of small-size pressure castings.

Description

Technical Field

[0001] The invention relates to the casting of automobile parts, in particular to a magnesium alloy die-casting die. Background Art

[0002] Magnesium alloy die-castings are increasingly used in the field of automotive parts. The one-mold-multiple-cavity die-casting method is a common method in the production process of magnesium alloy die-castings. The key to die-casting products using the one-mold-multiple-cavity method is to ensure the synchronization of feeding each cavity, which is very important for ensuring the quality stability of the products in each cavity. The synchronization of cavity feeding is directly related to the runner design and cavity ranking. Therefore, when die-casting products using the one-mold-multiple-cavity method, several branch runners are often set up with the discharge end of the main runner as the center, and the branch runners are then connected to multiple cavities; the arrangement of all branch runners and cavities is generally symmetrical; and when there are many products being formed at the same time, the branch runners inevitably need to bend and change direction in different directions.

[0003] On the one hand, the interfaces between different runners and the main runners are oriented in different directions, and the magnesium alloy melt enters the runners from the main runner at different angles at the same time, resulting in different flow rates of the magnesium alloy melt in different runners; on the other hand, the curved and reversing runners cause unstable fluctuations in the flow state of the magnesium alloy melt, further causing flow rate differences; these flow rate differences will cause some differences in the synchronization of the magnesium alloy melt entering the mold cavity. When the number of die-castings formed at one time is small and the volume is relatively large, the unstable product quality caused by the poor synchronization of the magnesium alloy melt feeding is not obvious and is acceptable; while when the number of die-castings formed at one time is large and the volume is small (for example: camshaft cover), the unstable product quality caused by the poor synchronization of the magnesium alloy melt feeding is relatively obvious, and the die-castings in the mold cavity with slow feeding will have obvious, visible pores or sand eyes.

[0004] Therefore, it is particularly necessary to carry out a more optimized runner feeding design for multi-cavity die casting with a large number and small volume. The core of this design is to further improve the synchronization of cavity feeding. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a molten metal pouring system with segmented acceleration of the main runner and segmented feeding of the branch runner. The main technical solutions adopted are:

[0006] A cam bearing cover die casting mold pouring system comprises a mold body, wherein: a main pouring channel extending horizontally and linearly is arranged on the mold body, and branch runners are arranged on both sides of the main pouring channel, and the feed end of the branch runner is connected to the main pouring channel;

[0007] The main runner includes four feeding sections, which are respectively a main runner section, a second main runner section, a third main runner section and a fourth main runner section connected in sequence in a straight line along the feeding direction;

[0008] The ratio of the cross-sectional areas of the first main runner, the second main runner, the third main runner, and the fourth main runner is 1:0.7-0.8:0.4-0.6:0.2-0.3;

[0009] A branch runner is provided on both sides of each feed section, and the cross-sectional area of ​​the feed end of the branch runner is smaller than the cross-sectional area of ​​the four main runners. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the planar structure of the present invention;

[0011] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0012] Figure 3 This is a schematic diagram of the distribution of filling particles when they just reach the end of the branch runner b connected to a section of the main runner a1;

[0013] Figure 4 This is a schematic diagram of the distribution of filling particles when they just reach the end of the branch runner b connected to the second-stage main runner a1;

[0014] Figure 5 This is a schematic diagram of the distribution of filling particles when they just reach the end of the branch runner b connected to the third and fourth main runners a1;

[0015] Figure 6 It is a schematic diagram of the velocity field when the filling particles just reach the end of the branch runner b connected to a section of the main runner a1;

[0016] Figure 7 It is a schematic diagram of the velocity field when the filling particles just reach the end of the branch runner b connected to the second-stage main runner a1;

[0017] Figure 8 It is a schematic diagram of the velocity field when the filling particles just reach the end of the branch runner b connected to the third and fourth main runners a1. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with embodiments and drawings.

[0019] like Figure 1 , 2 As shown, a cam bearing cover die casting mold pouring system comprises a mold body 1, on which a main runner a extending horizontally and linearly is provided, and two sides of the main runner 1a are provided with branch runners b, and the feed end of the branch runner b is connected to the main runner a;

[0020] The main runner a comprises four feeding sections, which are respectively a main runner a1, a main runner a2, a main runner a3 and a main runner a4 which are connected in sequence in a straight line along the feeding direction;

[0021] The ratio of the cross-sectional areas of the first main runner a1, the second main runner a2, the third main runner a3, and the fourth main runner a4 is 1:0.7-0.8:0.4-0.6:0.2-0.3; the ratio of the lengths of the second main runner a2, the third main runner a3, and the fourth main runner a4 is 0.9-1.1:0.9-1.1:0.9-1.1.

[0022] The preferred technical solution is that the ratio of the cross-sectional areas of the first main runner a1, the second main runner a2, the third main runner a3, and the fourth main runner a4 is 1:0.75:0.5:0.25; the ratio of the lengths of the second main runner a2, the third main runner a3, and the fourth main runner a4 is 1:1:1.

[0023] A branch runner b is respectively provided on both sides of each of the feed sections, and the cross-sectional area of ​​the feed end of the branch runner b is smaller than the cross-sectional area of ​​the four main runners a4.

[0024] The feed section includes a runner bottom surface, a runner top surface and two runner side surfaces, the runner bottom surface, the runner top surface and the two runner side surfaces are all planes, the space enclosed by the runner bottom surface, the runner top surface and the two runner side surfaces forms the feed section, the distance between the runner bottom surface and the runner top surface is the runner height, and the distance between the two runner side surfaces is the runner width;

[0025] The top surfaces of the runners of the four feeding sections are flush, the runner heights of the four feeding sections decrease in sequence along the feeding direction, and the runner widths of the four feeding sections decrease in sequence along the feeding direction;

[0026] The feed end of the branch channel b is close to the top surface of the runner.

[0027] The main runner a also includes a contraction section, wherein the contraction section has a large interface and a small interface, and the large interface and the small interface have an arc transition;

[0028] The downstream end of each of the feed sections is respectively connected to a contraction section, the large interface of the contraction section is used to communicate with the upstream feed section, and the small interface of the contraction section is used to communicate with the downstream feed section;

[0029] The feed end of the branch channel b is close to the corresponding contraction section.

[0030] The mold body 1 includes a lower mold and an upper mold, the runner bottom surface and two runner side surfaces are arranged on the lower mold, the runner top surface is arranged on the upper mold, and the runner b is also arranged on the lower mold.

[0031] The branch runner b includes a transverse section b1 and a longitudinal section b2, the length direction of the transverse section b1 is perpendicular to the direction of the main runner a, and the length direction of the longitudinal section b2 is parallel to the direction of the main runner a;

[0032] The inner end of the transverse section b1 is connected to the main runner a, the outer end of the transverse section b1 is connected to the middle of the longitudinal section b2, and the outer ends of all the transverse sections b1 are located at the same level;

[0033] Both ends of the longitudinal section b2 are respectively connected to cavities for forming a camshaft cover, and the cavities are provided in both the lower die and the upper die.

[0034] The transverse section b1 extends in a horizontal straight line, the inner end cross-sectional area of ​​the transverse section b1 is larger than the outer end cross-sectional area, and the inner and outer ends of the transverse section b1 are transitioned in a straight line.

[0035] The length ratio of the transverse section b1 to the longitudinal section b2 is 1:0.5-0.6; the length ratio of the transverse section b1, the second-stage main runner a2, the third-stage main runner a3, and the fourth-stage main runner a4 is 0.8-1.1:0.9-1.1:0.9-1.1:0.9-1.1.

[0036] Preferably, the length ratio of the first main runner a1, the second main runner a2, the third main runner a3, and the fourth main runner a4 is 0.9-1:1-1.1:1:1.

[0037] The main runner a is axially symmetrical about its length center line, the transverse sections b1 on both sides of the same feed section have the same length, and the connecting line of the outer ends of all the transverse sections b1 on the same side of the main runner a is parallel to the length of the main runner a.

[0038] A more specific implementation is described below:

[0039] The runner width of a main runner a1 is 51mm, the runner height is 22mm, and the cross-sectional area is A a1 ≈1122mm 2 ;

[0040] The runner width of the second main runner a2 is 44mm, the runner height is 19mm, and the cross-sectional area is A a2 ≈836mm 2 ;

[0041] The runner width of the three-stage main runner a3 is 33mm, the runner height is 17mm, and the cross-sectional area is A a3 ≈561mm 2 ;

[0042] The runner width of the four-stage main runner a4 is 22mm, the runner height is 13mm, and the cross-sectional area is A a4 ≈286mm 2 ;

[0043] The cross-sectional area A of the inner end of the transverse section b1 b1内 155-160mm 2 ;

[0044] The cross-sectional area A of the outer end of the transverse section b1 b1外 ≈135mm 2 ;

[0045] The length of the main runner a1 is 86 mm;

[0046] The length of the second main runner a2 is 79 mm;

[0047] The length of the three-section main runner a3 is 80 mm;

[0048] The length of the four main runners a4 is 82 mm;

[0049] The length of the transverse section b1 is 68-81 mm;

[0050] The length of the longitudinal section b2 is 40 mm.

[0051] The two ends of the longitudinal section b2 are respectively connected to a mold / cavity for molding a camshaft cover, thereby forming a 1-mold 16-cavity die-casting system.

[0052] The software was used to simulate the die casting system with 1 die and 16 cavities. The particle tracking simulation results and velocity field simulation results of the filling process are shown in Figure 3-Figure 8 ;

[0053] in Figure 3 This is a schematic diagram of the distribution of filling particles when they just reach the end of the branch runner b connected to a section of the main runner a1;

[0054] Figure 4 This is a schematic diagram of the distribution of filling particles when they just reach the end of the branch runner b connected to the second-stage main runner a1;

[0055] Figure 5 This is a schematic diagram of the distribution of filling particles when they just reach the end of the branch runner b connected to the third and fourth main runners a1;

[0056] It is important to note that: Figure 3 ,4 , 5 are transient screenshots, from Figure 3 to Figure 4 , and then Figure 5 The process occurs in a very short time interval.

[0057] according to Figure 3 , 4 As can be seen from Figure 5, the filling particles (used to simulate the flow of magnesium liquid) reach the ends of all branch channels b (i.e., the two ends of the longitudinal section b2) almost at the same time, and the synchronization of feeding to all mold cavities is very good.

[0058] Figure 6 It is a schematic diagram of the velocity field when the filling particles just reach the end of the branch runner b connected to a section of the main runner a1;

[0059] Figure 7 It is a schematic diagram of the velocity field when the filling particles just reach the end of the branch runner b connected to the second-stage main runner a1;

[0060] Figure 8 It is a schematic diagram of the velocity field when the filling particles just reach the end of the branch runner b connected to the third and fourth main runners a1;

[0061] from Figure 6 , 7 As shown in Figure 8, the main runner a has an accelerating effect on the filling particles. Although the filling particles first enter the upstream branch channel b, the filling particles in the downstream have a faster flow rate, and their flow rate in the corresponding branch channel b is even faster, so they arrive at the end of the branch channel b almost at the same time as the filling particles in the upstream branch channel b.

[0062] In multiple and long-term actual production, the camshaft covers produced in the 16 mold cavities have stable quality and no sand holes or air holes visible to the naked eye are produced.

[0063] Beneficial effect: The technical solution of the present invention can accelerate the magnesium liquid through the main runner, so that the magnesium liquid can reach the mold cavity / mold almost at the same time through the pouring system, thereby improving the feeding synchronization of the mold cavity during one-mold multi-cavity die-casting, and providing a more reliable guarantee for the quality stability when a large number of small-volume die-casting parts are die-cast.

[0064] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A cam bearing cover die casting mold pouring system, comprising a mold body (1), characterized in that: A main runner (a) extending in a horizontal straight line is provided on the mold body (1), and branch runners (b) are provided on both sides of the main runner (1a), and the feed end of the branch runner (b) is connected to the main runner (a); The main runner (a) comprises four feeding sections, wherein the four feeding sections are respectively a main runner (a1), a main runner (a2), a main runner (a3) ​​and a main runner (a4) connected in sequence along a straight line in a feeding direction; The ratio of the cross-sectional areas of the first main runner (a1), the second main runner (a2), the third main runner (a3), and the fourth main runner (a4) is 1:0.7-0.8:0.4-0.6:0.2-0.3; A branch channel (b) is provided on both sides of each of the feed sections, and the cross-sectional area of ​​the feed end of the branch channel (b) is smaller than the cross-sectional area of ​​the four main runners (a4).

2. The cam bearing cover die casting mold pouring system according to claim 1, characterized in that: The ratio of the cross-sectional areas of the first main runner (a1), the second main runner (a2), the third main runner (a3), and the fourth main runner (a4) is 1:0.75:0.5:0.

25.

3. The cam bearing cover die casting mold pouring system according to claim 1, characterized in that: The length ratio of the two-stage main runner (a2), the three-stage main runner (a3), and the four-stage main runner (a4) is 0.9-1.1:0.9-1.1:0.9-1.

1.

4. The cam bearing cover die casting mold pouring system according to claim 1, 2 or 3, characterized in that: The feed section includes a runner bottom surface, a runner top surface and two runner side surfaces, the runner bottom surface, the runner top surface and the two runner side surfaces are all planes, the space enclosed by the runner bottom surface, the runner top surface and the two runner side surfaces forms the feed section, the distance between the runner bottom surface and the runner top surface is the runner height, and the distance between the two runner side surfaces is the runner width; The top surfaces of the runners of the four feeding sections are flush, the runner heights of the four feeding sections decrease in sequence along the feeding direction, and the runner widths of the four feeding sections decrease in sequence along the feeding direction; The feed end of the branch channel (b) is close to the top surface of the runner.

5. The cam bearing cover die casting mold pouring system according to claim 1, characterized in that: The main runner (a) further comprises a contraction section, wherein the contraction section has a large interface and a small interface, and an arc-shaped transition is formed between the large interface and the small interface; The downstream end of each of the feed sections is respectively connected to a contraction section, the large interface of the contraction section is used to communicate with the upstream feed section, and the small interface of the contraction section is used to communicate with the downstream feed section; The feed end of the branch channel (b) is close to the corresponding contraction section.

6. The cam bearing cover die casting mold pouring system according to claim 1, 2, 3 or 5, characterized in that: The branch runner (b) comprises a transverse section (b1) and a longitudinal section (b2), wherein the length direction of the transverse section (b1) is perpendicular to the direction of the main runner (a), and the length direction of the longitudinal section (b2) is parallel to the direction of the main runner (a); The inner end of the transverse section (b1) is connected to the main runner (a), the outer end of the transverse section (b1) is connected to the middle of the longitudinal section (b2), and the outer ends of all the transverse sections (b1) are located at the same level; Both ends of the longitudinal section (b2) are respectively connected to a mold cavity for molding a camshaft cover.

7. The cam bearing cover die casting mold pouring system according to claim 6, characterized in that: The transverse section (b1) extends in a horizontal straight line, the inner end cross-sectional area of ​​the transverse section (b1) is larger than the outer end cross-sectional area, and the inner and outer ends of the transverse section (b1) are in a straight line transition.

8. The cam bearing cover die casting mold pouring system according to claim 6, characterized in that: The length ratio of the transverse section (b1) to the longitudinal section (b2) is 1:0.5-0.

6.

9. The cam bearing cover die casting mold pouring system according to claim 6, characterized in that: The length ratio of the transverse section (b1), the second-stage main runner (a2), the third-stage main runner (a3), and the fourth-stage main runner (a4) is 0.8-1.1: 0.9-1.1: 0.9-1.1: 0.9-1.1.

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