Die-casting die

Abstract

According to the die-casting die, the cavity is defined by the first forming area and the second forming area, the flow gate can communicate with the second forming area in the normal direction of the second face, after molten metal enters the second forming area from the flow gate, the third sub-part is filled with the molten metal, and then the molten metal is evenly lifted to the first sub-part in the normal direction of the second face; and the first sub-part and the second sub-part are filled with the molten metal, so that the situation that the molten metal converges at the second sub-part is avoided. Moreover, the first sub-part, the first overflow groove and the second sub-part are filled with the molten metal entering the first sub-part, and the first sub-part and the second sub-part are filled with the molten metal firstly and then the second sub-part due to the fact that the volumes of the first sub-part and the first overflow groove are larger than those of the second sub-part, so that the situation that the pressure suddenly changes after the first sub-part is filled with the molten metal is avoided; the molten metal of the second sub-part is impacted or the flow velocity is increased suddenly, so that bubbles are mixed, and air holes are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of die-casting processing, and in particular relates to a die-casting mold. Background Art

[0002] When using die casting to produce products with a bulge in the middle and a short length, the plane where the product has the largest diameter section is usually used as the parting surface, and the self-parting surface is used as the plane where the gate is located for casting. In this casting method, the position where the molten metals of different flows meet on the side of the cavity away from the gate, that is, the end of the molten metal flow lines of different flows, is unstable, and the overflow trough is set at the end of the molten metal flow lines of different flows to collect cold and dirty metal liquid and exhaust the best effect, which means that the overflow trough cannot fully play the role of collecting slag and exhausting, resulting in defects such as pores and slag holes in the products after cooling and forming. Summary of the invention

[0003] In order to solve the above-mentioned problems in the prior art, the present invention provides a die-casting mold, which can improve the quality of die-casting products.

[0004] In order to achieve the above object, the present invention provides a die-casting mold, comprising:

[0005] A front mold, the front mold comprising a first surface, a first molding area and a first overflow groove are provided on the first surface, and the first overflow groove is arranged at the periphery of the first molding area;

[0006] A rear mold, wherein the rear mold includes a second surface, the second surface faces the first surface and is arranged parallel to the first surface, a second molding area is arranged on the second surface, the first molding area and the second molding area form a mold cavity; the bottom of the second molding area is connected to the inner gate along the normal direction of the second surface;

[0007] The middle part of the cavity along the normal direction of the first surface, the part with a diameter not less than 70% of the maximum diameter of the cavity is defined as a first sub-part, the part located in the first molding area and smaller than 70% of the maximum diameter of the cavity is defined as a second sub-part, the part located in the second molding area and smaller than 70% of the maximum diameter of the cavity is defined as a third sub-part, the first overflow groove is connected to the first sub-part, and the ingate is connected to the third sub-part;

[0008] Among the cross sections of the first sub-section parallel to the first surface, the cross section with the largest diameter coincides with the first surface and / or the second surface, and the sum of the volumes of the first sub-section and the first overflow groove is greater than or equal to the volume of the second sub-section;

[0009] Wherein, the first direction is the width direction of the rear mold.

[0010] As an optional embodiment, the rear mold is provided with a mounting groove, the mounting groove penetrates from one side of the rear mold to the other side along the first direction, and the inner gate is provided at the bottom of the mounting groove;

[0011] The rear mold also includes a slider assembly, which is arranged in the installation groove; the slider assembly includes a first slider and a second slider, the first slider and the second slider are respectively arranged on both sides of the installation groove along the first direction, and the first slider and the second slider are connected to each other, the surfaces of the first slider and the second slider opposite to the first surface constitute the second surface, and the second molding area is arranged at the connection between the first slider and the second slider.

[0012] As an optional embodiment, the rear mold further includes a core, which is arranged on the bottom surface of the mounting groove along the normal direction of the second surface and penetrates the cavity, and the inner gate is arranged at the root of the core, and extends along the normal direction of the first surface and is connected to the third sub-portion;

[0013] A second overflow groove is also provided on the bottom surface of the mounting groove along the circumference of the core, and the second overflow groove is connected to the third sub-section. The channel connecting the second overflow groove and the third sub-section is provided on the core, and the channel connecting the second overflow groove and the third sub-section is at least 120° apart from the inner gate along the circumference of the core.

[0014] As an optional embodiment, the die-casting mold further includes a first slider seat, the first slider seat is arranged on both sides of the rear mold along the first direction, and the first slider and the second slider are respectively connected to the first slider seat located on different sides of the rear mold;

[0015] The die-casting mold also includes a hydraulic core-pulling mechanism, which is connected to the first slider seat along the first direction and is used to drive the first slider seat to move along the first direction so that the first slider and the second slider can be matched or separated along the first direction.

[0016] As an optional embodiment, the die-casting mold includes two cavities, and the two cavities are symmetrically arranged along the midline of the width of the rear mold and relative to the midline of the length of the rear mold. (6)

[0017] As an optional embodiment, a first mounting hole is further provided on the first surface, and the first mounting hole passes through the front mold along the normal direction of the first surface. The projection of the first mounting hole on the second surface is located on the midline of the length of the rear mold. A gate sleeve is passed through the first mounting hole, and a water jacket is provided on the outer periphery of the gate sleeve, and the water jacket is filled with cooling medium.

[0018] As an optional embodiment, the inner gates of different cavities are arranged relatively to each other along the length direction of the rear mold, and the rear mold is also provided with a pouring system, which includes a diverter cone, a straight runner and a cross runner. The cross runner is connected to the inner gates located in different cavities along the width direction of the rear mold, the projection of the first mounting hole on the second surface is surrounded by the diverter cone, and the straight runner is arranged along the first direction, one end of the straight runner extends to the diverter cone, and the other end intersects with the cross runner and passes through the cross runner, and the length of the straight runner passing through the cross runner is greater than or equal to the width of the cross runner.

[0019] As an optional embodiment, the die-casting mold further includes a side core-pulling mechanism, which includes a third slider, a second slider seat and an insert, the slider seat is arranged on both sides of the rear mold along the length direction of the rear mold, the slider is connected to the slider seat, and the insert is arranged along the length direction of the rear mold, and the inserts of the side core-pulling mechanism located on different sides are respectively abutted against the core of the corresponding cavity, and the surface of the insert abutting against the core is fitted to the surface of the core; the front mold is hollowed out to form an avoidance groove corresponding to the third slider, and the avoidance groove is connected to the first molding area;

[0020] The bottom of the avoidance groove and the third sliding block are hollowed out corresponding to the insert to form a third molding area. The third molding area surrounds the insert and is connected to the first molding area along the length direction of the rear mold.

[0021] As an optional embodiment, the second slider seat is provided with a guide hole, the axis of the guide hole is along the normal direction of the second surface, gradually approaching the center of the rear mold from both sides of the rear mold along its own length direction, and the front mold is provided with an inclined guide rod corresponding to the guide hole, and the inclined guide rod is slidably matched with the guide hole.

[0022] As an optional implementation, a third overflow groove is provided at the bottom of the avoidance groove at one end of the third molding area away from the first molding area, and the second overflow groove is connected to the third molding area;

[0023] The second surface is provided with a fourth overflow groove, and the fourth overflow groove is spaced apart from the projection of the third overflow groove on the second surface; the third overflow groove is connected with a connecting groove, and the connecting groove extends successively along the bottom surface, the side surface and the first surface of the avoidance groove, and one end of the connecting groove is away from the third overflow groove and coincides with the projection of the fourth overflow groove on the first surface.

[0024] The beneficial effects of the present invention are:

[0025] The die-casting mold of the present invention forms a cavity by enclosing the first molding area and the second molding area, so that the inner gate can be connected to the second molding area along the normal direction of the second surface. After the molten metal enters the second molding area from the inner gate, it first fills the third sub-section, then rises evenly to the first sub-section along the normal direction of the second surface, and fills the first sub-section and the second sub-section, thereby avoiding the situation where the molten metal converges at the second sub-section. Moreover, the molten metal after entering the first sub-section fills the first sub-section and the first overflow groove, and also fills the second sub-section at the same time. Since the volume of the first sub-section and the first overflow groove is larger than that of the second sub-section, the molten metal will first fill the first sub-section and then fill the second sub-section, thereby avoiding a sudden change in pressure after the molten metal fills the first sub-section, resulting in turbulence and mixing of bubbles in the molten metal in the second sub-section, thereby avoiding the generation of pores. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the die-casting mold proposed by the present invention;

[0027] Figure 2 An exploded view of the die-casting mold proposed by the present invention;

[0028] Figure 3 A cross-sectional view of the die-casting mold provided by the present invention at the core along a first direction;

[0029] Figure 4 for Figure 3 A partial enlarged view of the middle L area;

[0030] Figure 5 A cross-sectional view of the die-casting mold provided by the present invention at the core along the second direction;

[0031] Figure 6 for Figure 5 A partial enlarged view of the middle M region;

[0032] Figure 7 This is a front view of the rear die of the die-casting die proposed by the present invention (the slider assembly and the hydraulic core-pulling mechanism are omitted);

[0033] Figure 8 A front view of the die-casting die front mold provided by the present invention;

[0034] Description of Reference Numerals

[0035] Front mold, 1; first surface, 11; first molding area, 12; second sub-section, 121; first overflow groove, 13; first mounting hole, 14; gate bushing, 15; water jacket, 16; avoidance groove, 17; third molding area, 18; third overflow groove, 181; connecting groove, 182; inclined guide rod, 19;

[0036] rear mold, 2; second surface, 21; fourth overflow groove, 211; mounting groove, 22; inner gate, 221; second overflow groove, 222; core, 23;

[0037] Slider assembly, 3; second molding area, 31; first sub-section, 311; third sub-section, 312; first slider, 32; second slider, 33;

[0038] First slider seat, 4; hydraulic core pulling mechanism, 5;

[0039] gating system, 6; diverter cone, 61; sprue, 62; runner, 63;

[0040] Side core pulling mechanism, 7; third slider, 71; second slider seat, 72; guide hole, 721; insert, 73;

[0041] The first direction is X; the second direction is Y; and the third direction is Z. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inner side", "outer side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "assemble" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0046] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0047] In the description of the embodiments of the present invention, it is to be understood that "-" and "~" represent the range between two values, and the range includes the endpoints. For example: "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0048] In the description of the embodiments of the present invention, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0049] When using die casting to produce products with a bulge in the middle and a short length (the ratio of the diameter to the length at the bulge in the middle is about 0.8-1.8), the plane where the cross section of the product with the largest diameter is located is usually used as the parting surface, and the self-parting surface is used as the plane where the gate is located for casting. In this casting method, on the side of the cavity away from the gate, the position where the molten metals of different flows meet, that is, the end of the molten metal streamlines of different flows is unstable, and the overflow trough is set at the end of the molten metal streamlines of different flows to collect cold and dirty metal liquid and exhaust the best effect, which means that the overflow trough cannot fully play the role of collecting slag and exhausting, resulting in defects such as pores and slag holes in the products after cooling and forming. At the same time, when the molten metal first fills the cavity with the largest diameter, the flow rate of the molten metal that is filling other cavities suddenly increases, and the reaction force generated by the molten metal impacting the cavity wall will act on the molten metal that is filling other cavities, causing impact, easy to produce vibration and turbulence, thereby mixing bubbles, resulting in defects such as pores in the products after cooling and finalization.

[0050] Based on this, the present application provides a die-casting mold, by making the first molding area and the second molding area enclose a mold cavity, so that the inner gate can be connected to the second molding area along the normal direction of the second surface, and after the molten metal enters the second molding area from the inner gate, it first fills the third sub-section, and then rises evenly to the first sub-section along the normal direction of the second surface, and fills the first sub-section and the second sub-section, avoiding the situation where the molten metal converges at the second sub-section. Moreover, the molten metal after entering the first sub-section fills the first sub-section and the first overflow groove, and also fills the second sub-section at the same time. Since the volume of the first sub-section and the first overflow groove is larger than that of the second sub-section, the molten metal will first fill the first sub-section and then fill the second sub-section, avoiding a sudden change in pressure after the molten metal fills the first sub-section, causing the molten metal in the second sub-section to be impacted or the flow rate to increase sharply and mix with bubbles, thereby avoiding the generation of pores.

[0051] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0052] See also Figures 1 to 4 , and refer to Figure 7 and Figure 8 The present application discloses a die-casting mold, including a front mold 1 and a rear mold 2. The front mold 1 includes a first surface 11, on which a first molding area 12 and a first overflow groove 13 are provided, and the first overflow groove 13 is arranged on the periphery of the first molding area 12; the rear mold 2 includes a second surface 21, the second surface 21 faces the first surface 11 and is arranged parallel to the first surface 11, and a second molding area 31 is provided on the second surface 21, and the first molding area 12 and the second molding area 31 form a cavity; the bottom of the second molding area 31 is connected to the inner gate 221 along the normal direction of the second surface 21; wherein, the middle part of the cavity along the normal direction of the first surface 11, the part with a diameter not less than 70% of the maximum diameter of the cavity is defined as the second molding area 31; A sub-section 311, the part located in the first molding area 12 and less than 70% of the maximum diameter of the cavity is defined as the second sub-section 121, the part located in the second molding area 31 and less than 70% of the maximum diameter of the cavity is defined as the third sub-section 312, the first overflow groove 13 is connected to the first sub-section 311, and the inner gate 221 is connected to the third sub-section 312; wherein, among the sections of the first sub-section 311 parallel to the first surface 11, the section with the largest diameter coincides with the first surface 11 and / or the second surface 21, and the sum of the volumes of the first sub-section 311 and the first overflow groove 13 is greater than or equal to the volume of the second sub-section 121. wherein, the first direction X is the width direction of the rear mold 2. for ease of understanding and description, in the following description, the length direction of the rear mold 2 is defined as the second direction Y, and the normal direction of the second surface 21 is defined as the third direction Z.

[0053] When the die-casting mold of the present application is in use, the first surface 11 and the second surface 21 are fitted together, the first molding area 12 and the second molding area 31 are connected to form a mold cavity, and the molten metal is first filled in the third sub-section 312 after being injected from the inner gate 221 into the second molding area 31, and then uniformly rises to the first sub-section 311 along the third direction Z, and then fills the first sub-section 311 and the second sub-section 121. Even if the first sub-section 311, the second sub-section 121 and / or the third sub-section 312 are provided with a core 23 or other obstacles, the arrangement of the inner gate 221 and the second molding area 31 in this way can also avoid the situation where the diverted molten metal is affected by the core 23 or other obstacles at the second sub-section 121 and converges again.

[0054] It is easy to understand that the contact area between the molten metal divided into multiple streams and the gas in the cavity is larger than that of the molten metal that is not divided, so it is easier to cool, oxidize, and precipitate free silicon. It is also easier for the molten metal to mix with gas when it converges, thus causing defects such as cold shut, slag holes or air holes.

[0055] Moreover, the molten metal after entering the first sub-section 311 fills the first sub-section 311 and the first overflow groove 13, and also fills the second sub-section 121 at the same time. Since the volume of the first sub-section 311 and the first overflow groove 13 is larger than that of the second sub-section 121, the molten metal will first fill the first sub-section 311 and the first overflow groove 13 and then fill the second sub-section 121, thereby avoiding the molten metal in the second sub-section 121 being impacted or the flow rate suddenly increasing and mixing with bubbles after the molten metal fills the first sub-section 311, thereby avoiding the formation of pores. In addition, since the cross-sectional area of ​​the second subsection 121 along the third direction Z is smaller than that of the first subsection 311, after the second subsection 121 is filled, the flow originally belonging to the second subsection 121 is transferred to the first subsection 311, resulting in a relatively small increase in the flow velocity in the first subsection 311, which is relatively less likely to mix with gas, and the first subsection 311 is connected to the first overflow groove 13, so that gas and slag are easier to discharge. It can be seen that the risk of defects in the second subsection 121 will not be transferred to the first subsection 311, but will be reduced or even eliminated.

[0056] It should be noted that in the above explanation, "flow rate" refers to the mass (or volume) of fluid flowing through a unit of time, and "flow velocity" refers to the displacement of the fluid front per unit of time.

[0057] It should be noted that the first overflow groove 13 can also be connected to an exhaust groove, which is arranged along the surface of the first surface 11, with one end connected to the first overflow groove 13 and the other end connected to the air outside the mold. In this way, the gas in the first overflow groove 13 can be discharged through the exhaust groove. It should be noted that the inlet of the first overflow groove 13 into which the molten metal enters and the outlet connected to the exhaust groove should not be on the same straight line, so as to avoid the molten metal in the first overflow groove 13 entering the exhaust groove and causing blockage.

[0058] In addition, guide pillars and positioning structures (such as the cooperation of protrusions and recesses) may be provided to assist the fitting of the first surface 11 and the second surface 21 , thereby helping the mold closing process.

[0059] Optionally, the rear mold 2 is provided with a mounting groove 22, the mounting groove 22 penetrates from one side of the rear mold 2 to the other side along the first direction X, and an inner gate 221 is provided at the bottom of the mounting groove 22;

[0060] The rear mold 2 further includes a slider assembly 3, which is disposed in the mounting groove 22; the slider assembly 3 includes a first slider 32 and a second slider 33, which are respectively disposed on both sides of the mounting groove 22 along the first direction X, and the first slider 32 and the second slider 33 are connected to each other, and the surfaces of the first slider 32, the second slider 33 and the first surface 11 opposite to each other constitute the second surface 21, and the second molding area 31 is disposed at the connection between the first slider 32 and the second slider 33. When blanking, the first slider 32 and the second slider 33 will be separated along the first direction X, and the structure such as the ingate 221 on the bottom surface of the mounting groove 22 will be exposed along the third direction Z, so that the metal in the ingate 221 can be demoulded together with the product, thereby improving the convenience of product production.

[0061] Optionally, the die-casting mold includes two cavities, and the two cavities are symmetrically arranged along the width midline of the rear mold 2 and relative to the length midline of the rear mold 2. In this way, each die-casting mold can produce two products at a time, which is conducive to improving production efficiency. At the same time, the arrangement of the two cavities is relatively simple. In actual production, the two cavities can be arranged on the same horizontal line rather than the same vertical line. In the case described in the latter, the two cavities are connected by a runner, and the molten metal in the lower cavity of the two cavities will have a greater pressure, which is not conducive to the consistency of product quality.

[0062] See also Figures 5 and 6 Optionally, the rear mold 2 further includes a core 23, which is arranged on the bottom surface of the mounting groove 22 along the normal direction of the second surface 21 and penetrates the cavity, and the inner gate 221 is arranged on the core 23, and extends along the normal direction of the second surface 21 and is connected to the third sub-portion 312. A second overflow groove 222 is also arranged on the bottom surface of the mounting groove 22 along the circumference of the core 23, and the second overflow groove 222 is connected to the third sub-portion 312. The channel connecting the second overflow groove 222 and the third sub-portion 312 is arranged on the core 23, and the channel connecting the second overflow groove 222 and the third sub-portion 312 is at least 120° apart from the inner gate 221 along the circumference of the core 23.

[0063] Preferably, the number of the second overflow grooves 222 can be multiple (for example, two). Due to the presence of the core 23, after the molten metal enters the cavity from the ingate 221, it will surround the core 23 and fill the entire third sub-section 312 along the third direction Z, so that a molten metal confluence will be generated on the side of the core 23 away from the ingate 221. As mentioned above, defects are more likely to occur at the molten metal confluence. The second overflow groove 222 is provided to facilitate the discharge of the molten metal mixed with gas and slag from the third sub-section 312, thereby reducing the possibility of defects in the product at the third sub-section 312.

[0064] Optionally, a first mounting hole 14 is further provided on the first surface 11, and the first mounting hole 14 penetrates the front mold 1 along the normal direction of the first surface 11, and the projection of the first mounting hole 14 on the second surface 21 is located on the midline of the length of the rear mold 2, and a sprue bushing 15 is passed through the first mounting hole 14, and a water jacket 16 is provided on the outer periphery of the sprue bushing 15, and a cooling medium is filled in the water jacket 16. When the molten metal enters the die-casting mold, the first component to be contacted is the sprue bushing 15, and the temperature and pressure of the molten metal at this time are both relatively high. The water jacket 16 provided on the outer periphery can help cool the sprue bushing 15, and the sprue bushing 15 is eroded by the molten metal, which is beneficial to prolonging the life of the die-casting mold.

[0065] See also Figure 8 Optionally, the ingates 221 of different cavities are arranged opposite to each other along the length direction of the rear mold 2. The rear mold 2 is also provided with a pouring system 6, which includes a diverter cone 61, a sprue 62 and a runner 63. The runner 63 is connected to the ingates 221 located in different cavities along the width direction of the rear mold 2. The projection of the first mounting hole 14 on the second surface 21 surrounds the diverter cone 61. The sprue 62 is arranged along the first direction X. One end of the sprue 62 extends to the diverter cone 61, and the other end intersects with the runner 63 and passes through the runner 63. The length of the sprue 62 passing through the runner 63 is greater than or equal to the width of the runner 63. The two ingates 221 are arranged opposite to each other, so that the projection of the runner 63 connecting the two ingates 221 on the second surface 21 is straight, which reduces the bending of the ingates, which is beneficial to the flow of molten metal in the ingates and facilitates the molten metal to enter the cavity. In addition, the sprue 62 passes through the runner 63 for a certain length along the first direction X, and a depression can be formed at the end of the sprue 62, and the depression can store a small amount of molten metal. The molten metal entering the sprue 62 still has a relatively high temperature and pressure, and the molten metal in the depression can buffer the subsequent molten metal, thereby preventing the end of the sprue 62 or the wall of the runner 63 from being directly impacted by the molten metal, which is beneficial to improving the life of the die-casting mold.

[0066] Optionally, the die-casting mold further includes a first slider seat 4 and a hydraulic core-pulling mechanism 5. The first slider seat 4 is arranged on both sides of the rear mold 2 along the first direction X, and the first slider 32 and the second slider 33 are respectively connected to the first slider seat 4 located on different sides of the rear mold 2. The hydraulic core-pulling mechanism 5 is connected to the first slider seat 4 along the first direction X, and the hydraulic core-pulling mechanism 5 is used to drive the first slider seat 4 to move along the first direction X, so that the first slider 32 and the second slider 33 are matched or separated along the first direction X. After the product located in the mold cavity is cooled and formed, the hydraulic core-pulling mechanism 5 separates the first slider 32 from the second slider 33 along the first direction X, and exposes the inner gate 221, the second overflow groove 222 and other structures on the bottom surface of the installation groove 22 along the third direction Z, so that the metal in the inner gate 221 and the second overflow groove 222 can be demolded together with the product, thereby improving the convenience of product production.

[0067] In addition, the hydraulic core-pulling mechanism 5 provides a relatively large core-pulling force and a relatively long stroke, and can better separate the first slider 32 from the second slider 33 .

[0068] In addition, a push rod (not shown in the figure) can be set along the third direction Z at positions of the rear mold 2 corresponding to the second molding area 31, the first overflow trough 13, the second overflow trough 222 casting system 6, etc. to facilitate the unloading of the cooled and molded product.

[0069] In addition, a pressure strip may be provided on the side of the slider along the second direction Y to fix the first slider seat 4, and a wear-resistant block may be provided on the side of the first slider seat 4 away from the front mold 1 to reduce the contact area between the first slider seat 4 and other components (such as a frame for mounting the rear mold 2), thereby reducing friction and reducing wear between the first slider seat 4 and other components.

[0070] See also Figure 3 to Figure 4 as well as Figures 7 and 8Optionally, the die casting mold further comprises a side core pulling mechanism 7, which comprises a third slider 71, a second slider seat 72 and an insert 73. The slider seat is arranged on both sides of the rear mold 2 along the length direction of the rear mold 2, the slider is connected to the slider seat, and the insert 73 is arranged along the length direction of the rear mold 2. The inserts 73 of the side core pulling mechanism 7 located on different sides respectively abut against the core 23 of the corresponding cavity, and the surface of the insert 73 abutting against the core 23 is attached to the surface of the core 23; the front mold 1 is hollowed out corresponding to the third slider 71 to form an avoidance groove 17, and the avoidance groove 17 is connected to the first molding area 12. The bottom of the avoidance groove 17 and the third slider 71 are hollowed out corresponding to the insert 73 to form a third molding area 18, which surrounds the insert 73, and the third molding area 18 is connected to the first molding area 12 along the length direction of the rear mold 2. When there is a protruding structure on the side of the product (the plane where it is located intersects with the first surface 11), the side core pulling mechanism 7 is required to provide an additional core 23 or molding space. The surface of the insert 73 abutting against the core 23 fits with the surface of the core 23, which can prevent the molten metal from flowing between the insert 73 and the core 23, thereby preventing burrs, redundancy, etc. from occurring there.

[0071] Optionally, the second slider seat 72 is provided with a guide hole 721, the axis of which is along the normal direction of the second surface 21, gradually approaching the center of the rear mold 2 from both sides of the rear mold 2 along its own length direction, and the front mold 1 is provided with an inclined guide rod 19 corresponding to the guide hole 721, and the inclined guide rod 19 is slidably matched with the guide hole 721. The inclined guide rod 19 cooperates with the guide hole 721 to provide a core pulling force for the side core pulling mechanism 7, which is lower in cost than the hydraulic core pulling mechanism 5 described above, and is conducive to reducing the manufacturing cost of the die-casting mold. In addition, compared with the side core pulling mechanism 7, the inclined guide rod 19 and the guide hole 721 are simpler and more compact in structure, and are easy to place and install in the production area.

[0072] Optionally, a second overflow groove 222 is provided at the bottom of the avoidance groove 17 at one end of the third molding area 18 away from the first molding area 12, and the second overflow groove 222 is connected to the third molding area 18; a third overflow groove 181 is provided on the second surface 21, and the third overflow groove 181 is spaced apart from the projection of the second overflow groove 222 on the second surface 21; the second overflow groove 222 is connected to a connecting groove 182, and the connecting groove 182 extends successively along the bottom surface, the side surface and the first surface 11 of the avoidance groove 17, and the end of the connecting groove 182 away from the second overflow groove 222 coincides with the projection of the third avoidance groove 17 on the first surface 11. After the product is cooled and shaped, the front mold 1 and the rear mold 2 need to be separated along the third direction Z. At this time, it is usually expected that all the shaped structures on the front mold 1 (including the product itself, each overflow groove and the metal shaped in the connecting channel, etc.) are separated from the front mold 1. At this time, the metal in the third overflow groove 181 and the fourth overflow groove 211 are connected by the metal in the connecting groove 182, which can help the metal in the third overflow groove 181 to be removed from the third overflow groove 181. In addition, a push rod mechanism can be set corresponding to the fourth overflow groove 211 to facilitate the removal of the metal in the third overflow groove 181 and the fourth overflow groove 211 together when unloading.

[0073] Optionally, the draft angle of the first overflow groove 13 and the third overflow groove 181 is greater than or equal to 15°. As mentioned above, after the product is cooled and shaped, the front mold 1 and the rear mold 2 need to be separated along the third direction Z. At this time, it is usually expected that all the shaped structures on the front mold 1 (including the product itself, each overflow groove and the metal shaped in the connecting channel, etc.) are separated from the front mold 1 for unloading. The first overflow groove 13 and the third overflow groove 181 are configured with a larger draft angle to help them to be smoothly removed from the front mold 1 during demolding.

[0074] Finally, it should be noted that although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A die-casting mold, characterized in that: include: A front mold, the front mold comprising a first surface, a first molding area and a first overflow groove are provided on the first surface, and the first overflow groove is arranged on the periphery of the first molding area; A rear mold, wherein the rear mold includes a second surface, the second surface faces the first surface and is arranged parallel to the first surface, a second molding area is arranged on the second surface, the first molding area and the second molding area form a mold cavity; the bottom of the second molding area is connected to the inner gate along the normal direction of the second surface; The middle part of the cavity along the normal direction of the first surface, the part with a diameter not less than 70% of the maximum diameter of the cavity is defined as a first sub-part, the part located in the first molding area and smaller than 70% of the maximum diameter of the cavity is defined as a second sub-part, the part located in the second molding area and smaller than 70% of the maximum diameter of the cavity is defined as a third sub-part, the first overflow groove is connected to the first sub-part, and the ingate is connected to the third sub-part; Among the cross sections of the first sub-section parallel to the first surface, the cross section with the largest diameter coincides with the first surface and / or the second surface, and the sum of the volumes of the first sub-section and the first overflow groove is greater than or equal to the volume of the second sub-section.

2. A die-casting mold according to claim 1, characterized in that: The rear mold is provided with a mounting groove, the mounting groove penetrates from one side of the rear mold to the other side along a first direction, and the inner gate is provided at the bottom of the mounting groove, wherein the first direction is the width direction of the rear mold; The rear mold also includes a slider assembly, which is arranged in the installation groove; the slider assembly includes a first slider and a second slider, the first slider and the second slider are respectively arranged on both sides of the installation groove along the first direction, and the first slider and the second slider are connected to each other, the surfaces of the first slider, the second slider and the first surface opposite to the first surface constitute the second surface, and the second molding area is arranged at the connection between the first slider and the second slider.

3. A die-casting mold according to claim 2, characterized in that: The rear mold further includes a core, which is arranged on the bottom surface of the mounting groove along the normal direction of the second surface and penetrates the cavity, and the inner gate is arranged at the root of the core, extends along the normal direction of the second surface and is connected to the third sub-section; A second overflow groove is also provided on the bottom surface of the mounting groove along the circumference of the core, and the second overflow groove is connected to the third sub-section. The channel connecting the second overflow groove and the third sub-section is provided on the core, and the channel connecting the second overflow groove and the third sub-section is at least 120° apart from the inner gate along the circumference of the core.

4. A die-casting mold according to claim 2, characterized in that: The die-casting mold further includes a first slider seat, which is arranged on both sides of the rear mold along the first direction, and the first slider and the second slider are respectively connected to the first slider seats located on different sides of the rear mold; The die-casting mold also includes a hydraulic core-pulling mechanism, which is connected to the first slider seat along the first direction and is used to drive the first slider seat to move along the first direction so that the first slider and the second slider can be matched or separated along the first direction.

5. The die-casting mold according to claim 1, characterized in that: The die-casting mold comprises two cavities, and the two cavities are symmetrically arranged along the midline of the width of the rear mold and relative to the midline of the length of the rear mold.

6. A die-casting mold according to claim 2, characterized in that: A first mounting hole is also provided on the first surface, and the first mounting hole passes through the front mold along the normal direction of the first surface. The projection of the first mounting hole on the second surface is located on the midline of the length of the rear mold. A gate sleeve is passed through the first mounting hole, and a water jacket is provided on the outer periphery of the gate sleeve, and the water jacket is filled with a cooling medium.

7. A die-casting mold according to claim 6, characterized in that: The inner gates of different cavities are arranged relatively to each other along the length direction of the rear mold. The rear mold is also provided with a pouring system, which includes a diverter cone, a straight runner and a cross runner. The cross runner is connected to the inner gates located in different cavities along the width direction of the rear mold. The projection of the first mounting hole on the second surface is surrounded by the diverter cone. The straight runner is arranged along the first direction. One end of the straight runner extends to the diverter cone, and the other end intersects with the cross runner and passes through the cross runner. The length of the straight runner passing through the cross runner is greater than or equal to the width of the cross runner.

8. The die-casting mold according to claim 5, characterized in that: The die-casting mold further includes a side core-pulling mechanism, which includes a third slider, a second slider seat and an insert, wherein the slider seat is arranged on both sides of the rear mold along the length direction of the rear mold, the slider is connected to the slider seat, and the insert is arranged along the length direction of the rear mold, and the inserts of the side core-pulling mechanism located on different sides respectively abut against the core of the corresponding cavity, and the surface of the insert abutting against the core fits the surface of the core; the front mold is hollowed out to form an avoidance groove corresponding to the third slider, and the avoidance groove is connected to the first molding area; The bottom of the avoidance groove and the third sliding block are hollowed out corresponding to the insert to form a third molding area. The third molding area surrounds the insert and is connected to the first molding area along the length direction of the rear mold.

9. A die-casting mold according to claim 8, characterized in that: The second slider seat is provided with a guide hole, the axis of the guide hole is along the normal direction of the second surface, gradually approaching the center of the rear mold from both sides of the rear mold along its own length direction, and the front mold is provided with an inclined guide rod corresponding to the guide hole, and the inclined guide rod is slidably matched with the guide hole.

10. The die-casting mold according to claim 8, characterized in that: A third overflow groove is provided at the bottom of the avoidance groove at one end of the third molding area away from the first molding area, and the third overflow groove is connected to the third molding area; The second surface is provided with a fourth overflow groove, and the fourth overflow groove is spaced apart from the projection of the third overflow groove on the second surface; the third overflow groove is connected with a connecting groove, and the connecting groove extends successively along the bottom surface, the side surface and the first surface of the avoidance groove, and one end of the connecting groove is away from the third overflow groove and coincides with the projection of the fourth overflow groove on the first surface.

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