Die-casting die capable of achieving stable self-locking and die-casting forming method

Abstract

The invention discloses a die-casting die capable of achieving stable self-locking and a die-casting forming method, and belongs to the technical field of die-casting formation.The die-casting die is characterized in that a guide column on a fixed die is arranged to be a tooth-shaped guide column, and a locking hole penetrating through a guide column hole is formed between the adjacent side faces of a die frame of a movable die; and self-locking assemblies comprising tooth-shaped movable blocks and driving units are arranged at the two ends of the locking hole, concave-convex limiting structures at the ends of the two tooth-shaped movable blocks are matched with tooth groove structures on the periphery of the tooth-shaped guide column in a meshed mode after the die is closed, and die self-locking after die-casting die closing is achieved. According to the die-casting die, stable self-locking between the movable die body and the fixed die body after die assembly can be achieved while the conventional use function of the die-casting die is met, the reliability of maintaining the die assembly state in the use process of the die-casting die is guaranteed, die expansion and material flying caused by too large expansion force are avoided, and the machining quality of parts is guaranteed; the method is particularly suitable for machining scenes with limited die clamping force of a die-casting machine, and has good practical value and application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of die casting, and in particular relates to a die casting mould capable of stable self-locking and a die casting method. Background Art

[0002] In industrial production activities, die-casting molds are widely used and play a very important role in the molding and manufacturing process of various parts. For die-casting molds, they generally include a movable mold and a fixed mold. When the die-casting mold is used, it is necessary to ensure that the movable mold and the fixed mold are in a reliable mold-closing state. At this time, it is necessary to apply sufficient clamping force to the die-casting mold to resist the expansion force during the use of the mold, avoid mold flying caused by the expansion of the mold, and thus ensure the accuracy of die-casting parts processing.

[0003] Normally, the mold expansion force is equal to the product of the projected area of ​​the casting and the production casting pressure, that is, the mold expansion force is mainly affected by the dual influence of the product projected area and the casting pressure. After the mold is developed, the projected area of ​​the casting is a fixed value, which is mainly related to the shape and size of the parts to be formed.

[0004] As the size of die-casting parts increases, especially with the rapid advancement of integrated die-casting, the projected area of ​​castings increases, and the demand for setting the clamping force of the mold increases. Moreover, although the tonnage (clamping force) of the die-casting machine is also increasing, it is still difficult to lock the mold with a large projected area. At this time, it is often only possible to prevent the mold from flying by reducing the casting pressure to ensure that the mold expansion force is less than the clamping force of the die-casting machine. However, when the casting pressure is reduced, it is very easy to make it difficult to ensure the internal quality of the product, and it is impossible to accurately obtain qualified casting products, which brings new production problems. Summary of the invention

[0005] In response to one or more of the above defects or improvement needs in the prior art, the present invention provides a die-casting mold and a die-casting molding method that can be stably self-locked, which can achieve reliable locking of the movable mold and the fixed mold after the die-casting mold is closed, avoid the expansion of the mold caused by the expansion force exceeding the locking force of the die-casting machine, and improve the quality of die-casting parts production.

[0006] To achieve the above object, one aspect of the present invention provides a die-casting mold capable of stable self-locking, comprising a movable mold and a fixed mold, wherein a guide post is arranged on the mold frame of the fixed mold, and a guide post hole for embedding the guide post is opened on the mold frame of the movable mold; The guide post is a toothed guide post, which can be embedded in the outer periphery of the guide post hole and has a plurality of annular grooves spaced apart therefrom, and forms a plurality of annular teeth spaced apart in the axial direction; and The mold frame of the movable mold is provided with locking holes orthogonally corresponding to the guide post holes and obliquely penetrate the adjacent two side walls of the mold frame, and self-locking components are respectively provided at the openings at both ends of the locking holes; The self-locking component includes a toothed movable block and a driving unit; the toothed movable block is slidably embedded in the locking hole, one end of which is a connecting end connected to the output shaft of the driving unit, and the other end of which is a locking end with a semi-cylindrical groove; semi-circular tooth grooves are respectively provided on the arc-shaped wall surface of the semi-cylindrical groove corresponding to each of the annular teeth; then when the die-casting mold is closed in place, the two toothed movable blocks in each of the locking holes can abut with their locking ends against the outer periphery of the matching toothed guide column under the drive of their respective driving units, and each of the annular teeth is respectively embedded in the annular groove formed by two semi-circular tooth grooves.

[0007] As a further improvement of the present invention, half of the sum of the side wall areas of all the annular grooves is not less than the cross-sectional area of ​​the guide column at the bottom of the annular groove.

[0008] As a further improvement of the present invention, half of the sum of the side wall areas of all the annular grooves is equal to 1.0 to 1.2 times the cross-sectional area of ​​the guide post at the bottom of the annular groove.

[0009] As a further improvement of the present invention, the guide post hole is a stepped hole, whose inner diameter close to the fixed mold end corresponds to the outer diameter of the guide post, and whose inner diameter away from the fixed mold end is larger than the outer diameter of the guide post, and a guide sleeve with an inner diameter corresponding to the outer diameter of the guide post is coaxially embedded in the large diameter end of the stepped hole.

[0010] As a further improvement of the present invention, a bracket is provided corresponding to the installation of the driving unit on the movable mold frame, and both ends of the bracket are connected to the side wall surface of the mold frame through a plurality of connecting frames.

[0011] As a further improvement of the present invention, the connecting end is connected to the output shaft of the driving unit via a connecting sleeve, and the outer diameter of the connecting sleeve is larger than the outer diameter of the connecting end; Correspondingly, a limiting step is formed at the end of the locking hole, which is used for axial limiting of the toothed movable block when it is driven close to the toothed guide column.

[0012] As a further improvement of the present invention, the annular grooves have the same size and the intervals between two adjacent annular grooves are the same.

[0013] As a further improvement of the present invention, the driving unit is a cylinder.

[0014] As a further improvement of the present invention, the die-casting mold is of square structure, and toothed guide pillars are respectively arranged at the four corners of the fixed mold of the die-casting mold, and a pair of self-locking components are respectively arranged at the four corners of the movable mold of the die-casting mold.

[0015] Another aspect of the present invention further provides a die-casting method, which is performed using a die-casting mold that can be stably self-locked, and includes the following process: Before mold closing, control each of the driving units to drive the corresponding toothed movable block to a position away from the guide post hole; Controlling the movable mold to move and start mold closing, so that the end of the toothed guide pin is embedded in the guide pin hole until the movable mold and the fixed mold are completely closed; Controlling each of the driving units to work, driving each toothed movable block toward the corresponding toothed guide post, until the end of each toothed movable block abuts against the outer periphery of the toothed guide post, and the concave-convex limiting structure at the end of the toothed movable block is just meshed and matched with the tooth groove structure on the outer periphery of the toothed guide post; Controlling each of the driving units to lock in place, completing the self-locking of the die-casting mold after the die-casting mold is closed; thereafter, injecting molding molten metal into the die-casting mold until the die-casting molding process of the component is completed; Before opening the mold, each of the driving units controls the corresponding toothed movable blocks to retreat, releasing the lock of the paired toothed movable blocks on both sides of the toothed guide pillars; thereafter, the movable mold is controlled to move away from the fixed mold to open the die-casting mold, completing the die-casting molding process of the parts.

[0016] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0017] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects: (1) The die-casting mold capable of stable self-locking in the present invention is characterized in that the guide pins on the fixed mold are set as toothed guide pins, a locking hole penetrating the guide pin holes is provided between adjacent side surfaces of the mold frame of the movable mold, and a self-locking assembly including a toothed movable block and a driving unit is provided at both ends of the locking hole. The concave and convex limiting structures at the ends of the two toothed movable blocks are meshed with the tooth groove structures on the outer periphery of the toothed guide pins after the mold is closed, so as to realize the self-locking of the mold after the mold is closed, avoid the mold expansion and flying of materials caused by the expansion force during the use of the die-casting mold, ensure the accuracy and quality of the parts during die-casting, and improve the performance of the die-casting mold.

[0018] (2) The die-casting mold capable of stable self-locking in the present invention optimizes the structural parameters of the annular teeth and annular groove on the outer periphery of the toothed guide column so that the sum of the single-side surface areas of the plurality of annular teeth is not less than the cross-sectional area of ​​the guide column at the bottom area of ​​the annular groove, thereby ensuring the balance of force on the internal and external structures when the toothed guide column and the toothed movable block are matched and locked, avoiding the toothed guide column from being broken or deformed due to the expansion force, further improving the reliability of the setting and use of the self-locking component, and extending the service life of the self-locking component after setting.

[0019] (3) The die-casting method of the present invention utilizes a die-casting mold that can be stably self-locked. The control process is simple and the operation is convenient. It can effectively ensure the control accuracy of the mold during the component molding process, improve the quality of the component during die-casting, and fully avoid mold opening waste caused by excessive expansion force or insufficient clamping force, reduce the waste of raw materials and the generation of defective products, and improve the efficiency and production capacity of die-casting.

[0020] (4) The die-casting mold capable of stable self-locking in the present invention has a simple structure and is easy to control. It can achieve stable self-locking between the movable mold and the fixed mold after the mold is closed while meeting the conventional use functions of the die-casting mold, thereby ensuring the reliability of maintaining the closed mold state during the use of the die-casting mold, avoiding mold expansion and flying materials caused by excessive expansion force, and ensuring the quality of parts processing. It is particularly suitable for processing scenarios with limited clamping force of the die-casting machine, and has good practical value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic diagram from a first perspective of a die-casting mold capable of stable self-locking in an embodiment of the present invention; Figure 2 is a schematic diagram from a second perspective of a die-casting mold capable of stable self-locking in an embodiment of the present invention; Figure 3 It is a structural exploded diagram of a die-casting mold capable of stable self-locking in an embodiment of the present invention when a self-locking component is retained; Figure 4 is a front view of a die-casting mold capable of stable self-locking in an embodiment of the present invention; Figure 5 AA is a cross-sectional view of a die-casting mold capable of stable self-locking in an embodiment of the present invention; In all the drawings, the same reference numerals represent the same technical features, specifically: 100, movable mold; 200, fixed mold; 300, self-locking component; 1. Toothed guide post; 2. Guide post hole; 201. First through hole; 202. Second through hole; 3. Guide sleeve; 4. Toothed movable block; 5. Connecting sleeve; 6. First connecting piece; 7. Bracket; 8. Second connecting piece; 9. Driving unit; 10. Third connecting piece; 11. Locking hole; 12. Mounting groove. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] In the description of the present invention, it should be understood that, unless otherwise expressly specified and limited, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Example: For the die-casting mold in the preferred embodiment, it is mainly used to achieve reliable locking between the two mold frames when the mold is closed. It is particularly suitable for application scenarios where the locking force of the die-casting machine is limited or the mold expansion force is large. It is suitable for both the improvement of existing molds and the design and production of new molds.

[0029] See also Figure 1~Figure 5 The die-casting mold capable of stable self-locking in the preferred embodiment of the present invention comprises a movable mold 100 and a fixed mold 200 which are arranged correspondingly. The movable mold 100 and the fixed mold 200 respectively have a mold frame and a mold core arranged on the opposite end surfaces of the two mold frames.

[0030] It can be understood that, depending on the different parts to be processed, the mold cores on the two mold frames of the die-casting mold can be set to different forms. This is not the research focus of the preferred embodiment of the present invention, so it will not be elaborated here.

[0031] Furthermore, in the preferred embodiment, each guide post on the corresponding fixed mold 200 is respectively provided with a self-locking component 300 in pairs, so that after the guide post is matched with the movable mold 100, the two self-locking components 300 cooperate with each other to achieve the corresponding locking of the guide post in place, thereby achieving the mold locking of the fixed mold 200 and the movable mold 100, mechanically completing the self-locking of the die-casting mold, and preventing the die-casting mold from being pushed open by the expansion force after the mold is closed.

[0032] For example, in a specific preferred embodiment, the die casting mold is as follows Figure 1 The square structure shown in the figure has guide pillars arranged at its four corners. In this case, there are four pairs of corresponding self-locking components 300.

[0033] In more detail, in the preferred embodiment, the guide pin arranged on the fixed mold 200 is a toothed guide pin 1, which is used to match a plurality of annular grooves spaced apart on the outer periphery of one end of the movable mold 100, and a plurality of annular teeth spaced apart axially are formed on the outer periphery of the toothed guide pin 1; accordingly, corresponding to the setting of the toothed guide pin 1, guide pin holes 2 are respectively opened on the two mold frames, namely a first through hole 201 and a second through hole 202 coaxially arranged.

[0034] After assembly, one end of the toothed guide pin 1 is preferably fixedly connected to the mold frame of the fixed mold 200, and the other end with an annular tooth protrudes from the end surface of the fixed mold 200 toward the movable mold 100. At the same time, corresponding to the matching of the toothed guide pin 1, a guide sleeve 3 is preferably provided in the second through hole 202, so that the end of the toothed guide pin 1 can extend into the guide sleeve 3 after the two mold frames are molded together. Figure 5 as shown in .

[0035] In actual setting, the guide sleeve 3 is preferably installed from the back side (the side away from the mold core) of the movable mold 100 mold frame; at this time, the second through hole 202 is in the form of a stepped hole, and its outer diameter at the end close to the mold core corresponds to the outer diameter of the toothed guide pillar 1, and its outer diameter at the end away from the mold core is larger than the outer diameter of the toothed guide pillar 1. Of course, the inner diameter of the guide sleeve 3 is set corresponding to the outer diameter of the toothed guide pillar 1.

[0036] Furthermore, the multiple annular grooves opened on the outer circumference of the toothed guide pillar 1 are preferably arranged at equal intervals, and the structural dimensions of each annular tooth are the same; in this case, the annular teeth are arranged at equal intervals.

[0037] More specifically, to ensure the stability of the axial force after the toothed guide post 1 is matched with the self-locking assembly 300, the sum of the single-side areas of all the annular teeth in the preferred embodiment is equal to 1.0 to 1.2 times the cross-sectional area of ​​the guide post at the bottom of the annular groove. That is, half of the sum of the sidewall areas of all the annular grooves is equal to 1.0 to 1.2 times the cross-sectional area of ​​the guide post at the bottom of the annular groove.

[0038] Since the forces on the annular teeth are accumulated, while the forces on a single cross section in the middle area of ​​the guide column are continuous, and the annular teeth need to be in long-term contact with the toothed movable block 4 after setting, there is a risk of wear and deformation. Therefore, in the actual setting, the sum of the cross-sectional areas of the annular teeth (involving the depth of the annular groove and the number of annular teeth set) is set to be larger than the cross-sectional area of ​​the guide column at the bottom of the annular groove, thereby ensuring the stability of the force on the guide column structure at the opening position of the annular teeth.

[0039] Furthermore, corresponding to the arrangement of the toothed guide pin 1, a locking hole 11 penetrating two adjacent side surfaces of the mold frame is provided on the mold frame of the movable mold 100, and the locking hole 11 is connected to and orthogonally arranged with the second through hole 202. Accordingly, two self-locking components 300 corresponding to the toothed guide pin 1 are respectively arranged on the two side wall surfaces of the mold frame penetrating the locking hole 11.

[0040] In more detail, the self-locking assembly 300 in the preferred embodiment includes a toothed movable block 4 slidably embedded in the locking hole 11 and a driving unit 9 for driving the toothed movable block 4. One end of the toothed movable block 4 is a connecting end for connecting to the output shaft end of the driving unit 9, and the other end is a locking end for matching and locking with the outer peripheral wall of the toothed guide column 1.

[0041] Specifically, the locking end in the preferred embodiment is provided with a semi-cylindrical groove with two ends passing through it on the side away from the connecting end, and a plurality of semi-circular tooth grooves are provided on the arc-shaped wall surface of the groove, and the structural dimensions of each semi-circular tooth groove correspond to the annular teeth of the toothed guide column 1; in this way, when the toothed movable block 4 approaches the toothed guide column 1 along the radial direction of the toothed guide column 1, the tooth groove at the end of its locking end is just matched with the annular teeth on one side of the toothed guide column 1.

[0042] In actual settings, the depth and inner diameter of the semicircular tooth groove at the locking end correspond to the depth and outer diameter of the annular tooth, respectively, so that when the tooth-shaped movable block 4 matches the outer periphery of the tooth-shaped guide column 1, all parts within the extension range of the semicircular tooth groove are in contact and match with one side of the annular tooth; and then by using the two tooth-shaped movable blocks 4 in the two self-locking components 300 to be respectively set and operated on both sides of the radial direction of the tooth-shaped guide column 1, the outer periphery of the tooth-shaped guide column 1 in the locked state can be completely covered by the two tooth-shaped movable blocks 4, and each annular tooth is respectively embedded in the annular groove formed by the two semicircular tooth grooves, thereby ensuring the uniformity and reliability of the force applied to each area of ​​the annular gear ring upward.

[0043] Obviously, in a preferred embodiment, after the locking ends of the two toothed movable blocks 4 are butt-jointed, a cylindrical through hole can be formed between the two locking ends, and a plurality of annular grooves are also formed in the axial direction of the cylindrical through hole, and the inner diameter of the annular groove corresponds to the outer diameter of the annular tooth, and the inner diameter of the cylindrical through hole corresponds to the outer diameter of the annular groove, ensuring that the semicircular tooth portion formed by the opening of the semicircular tooth groove can be correspondingly embedded in the annular groove on the radial side of the toothed guide column 1, thereby realizing reliable locking of the toothed guide column 1 in the axial direction.

[0044] Exemplarily, when the toothed movable block 4 is provided, the number of the semicircular tooth grooves provided at the locking end thereof is equal to the number of the annular teeth formed on the outer periphery of the toothed guide column 1 .

[0045] In more detail, in actual configuration, the connection end of the toothed movable block 4 is connected to the output shaft of the drive unit 9 via a connection sleeve 5. In a preferred embodiment, the connection sleeve 5 includes two connection blocks each having a locking groove, and the two connection blocks are connected via a plurality of first connection members 6, and the locking of the end of the toothed movable block 4 and the end of the output shaft of the drive unit 9 is achieved by locking the two connection blocks.

[0046] In actual configuration, corresponding to the configuration of the driving unit 9, a bracket 7 having an L-shaped main body (excluding the connecting parts at both ends) is also provided. Figure 3 As shown in FIG. 1 , corresponding to the connection of the two ends of the bracket 7, a mounting groove 12 is provided on the side wall surface of the movable mold 100, so that the two ends of the bracket 7 can be connected to the side wall surface of the mold frame through a plurality of second connecting members 8, as shown in FIG. Figure 2 as shown in .

[0047] Correspondingly, the driving unit 9 in the preferred embodiment is connected to the bracket 7 via a plurality of third connecting members 10 .

[0048] Exemplarily, in a specific preferred embodiment, the driving unit 9 in the self-locking assembly 300 is an oil cylinder.

[0049] In addition, considering that the distances between the axis of the guide post hole 2 and the openings at both ends of the locking hole 11 may be different when the self-locking component 300 is actually set, the lengths of the two toothed movable blocks 4 set in pairs can be the same or different.

[0050] For example, in Figure 4 In the preferred embodiment shown, the toothed movable blocks 4 disposed on both sides of the toothed guide pillar 1 have different lengths.

[0051] More preferably, in a specific embodiment, the distance between the mounting position of the bracket 7 in the two self-locking components 300 arranged in pairs and the corner is equal, that is, Figure 4 In the preferred embodiment shown, the angles formed between the axis of the locking hole 11 and the adjacent two side surfaces of the mold frame are both 45 degrees.

[0052] Further preferably, after the connection of the connecting end of the toothed movable block 4 is completed, the outer diameter of the connecting sleeve 5 is preferably larger than the outer diameter of the connecting end of the toothed movable block 4. At this time, in order to avoid the transitional collision of the two toothed movable blocks 4 with the toothed guide column 1 due to excessive driving stroke, it is preferred to set at least one end of the locking hole 11 in the form of a stepped hole, the inner diameter of the large hole section of the stepped hole corresponds to the outer diameter of the connecting sleeve 5, and the inner diameter of the small hole section corresponds to the outer diameter of the connecting end of the toothed movable block 4.

[0053] With such arrangement, even if the driving force of the driving unit 9 is abnormal, the travel of the toothed movable block 4 can be limited by the limiting position of the connecting sleeve 5 at the step surface of the stepped hole, thereby fully avoiding the impact damage of the toothed movable block 4 on the toothed guide column 1.

[0054] In summary, in a preferred embodiment, by setting the guide post as a toothed guide post 1, and then opening a locking hole 11 that crosses the guide post hole 2 on the mold frame of the movable mold 100, and respectively providing a self-locking component 300 at both ends of the locking hole 11, and utilizing the setting and driving of the toothed movable block 4 in the self-locking component 300, the axial locking of the toothed guide post 1 after it is matched into place can be achieved, thereby completing the self-locking of the die-casting mold after the mold is closed, ensuring the reliability of the die-casting mold when it is closed and in use, and improving the quality of die-casting parts processing.

[0055] Further, for the die-casting mold in the preferred embodiment, the process of processing parts based on it is preferably as follows: Before mold closing, the toothed movable block 4 in each locking assembly 300 is controlled to be driven to a position away from the guide post hole 2; Control the movable mold 100 to move and start mold closing, so that the end of the toothed guide pin 1 with annular teeth on the fixed mold 200 is embedded in the guide pin hole 2 on the mold frame of the movable mold 100, until the movable mold 100 and the fixed mold 200 are completely closed; Control the driving unit 9 of each lock assembly 300 to work, and drive each toothed movable block 4 toward the toothed guide column 1, until the end of each toothed movable block 4 abuts against the outer periphery of the toothed guide column 1, and the concave-convex limiting structure at the end of the toothed movable block 4 is just meshed with the tooth groove structure on the outer periphery of the toothed guide column 1; The control driving unit 9 is locked in place to complete the self-locking of the die-casting mold after the die-casting mold is closed; thereafter, the molding metal liquid is injected into the die-casting mold until the die-casting molding process of the component is completed; Before opening the mold, each driving unit 9 controls the corresponding toothed movable block 4 to retreat, releasing the lock of the paired toothed movable blocks 4 on both sides of the toothed guide column 1; thereafter, the movable mold 100 is controlled to move away from the fixed mold 200 to realize the opening of the die-casting mold and complete the die-casting molding process of the parts.

[0056] The die-casting mold that can self-lock smoothly in the present invention has a simple structure and is easy to control. It can meet the conventional use functions of the die-casting mold and realize stable self-locking between the movable mold and the fixed mold after the mold is closed, thereby ensuring the reliability of maintaining the closed mold state during the use of the die-casting mold, avoiding mold expansion and flying materials caused by excessive expansion force, and ensuring the quality of component processing. It is particularly suitable for processing scenarios with limited clamping force of the die-casting machine, and has good practical value and application prospects.

[0057] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A die-casting mold capable of stable self-locking, comprising a movable mold and a fixed mold, wherein a guide post is arranged on the mold frame of the fixed mold, and a guide post hole for embedding the guide post is opened on the mold frame of the movable mold; characterized in that: The guide post is a toothed guide post, which can be embedded in the outer periphery of the guide post hole and has a plurality of annular grooves spaced apart therefrom, and forms a plurality of annular teeth spaced apart in the axial direction; and The mold frame of the movable mold is provided with locking holes orthogonally corresponding to the guide post holes and obliquely penetrate the adjacent two side walls of the mold frame, and self-locking components are respectively provided at the openings at both ends of the locking holes; The self-locking component includes a toothed movable block and a driving unit; the toothed movable block is slidably embedded in the locking hole, one end of which is a connecting end connected to the output shaft of the driving unit, and the other end of which is a locking end with a semi-cylindrical groove; semi-circular tooth grooves are respectively provided on the arc-shaped wall surface of the semi-cylindrical groove corresponding to each of the annular teeth; then when the die-casting mold is closed in place, the two toothed movable blocks in each of the locking holes can abut with their locking ends against the outer periphery of the matching toothed guide column under the drive of their respective driving units, and each of the annular teeth is respectively embedded in the annular groove formed by two semi-circular tooth grooves.

2. The die-casting mold capable of stable self-locking according to claim 1, characterized in that: Half of the sum of the side wall areas of all the annular grooves is not less than the cross-sectional area of ​​the guide post at the bottom of the annular groove.

3. The die-casting mold capable of stable self-locking according to claim 2, characterized in that: Half of the sum of the side wall areas of all the annular grooves is equal to 1.0 to 1.2 times the cross-sectional area of ​​the guide post at the bottom of the annular groove.

4. The die-casting mold capable of stable self-locking according to any one of claims 1 to 3, characterized in that: The guide post hole is a stepped hole, the inner diameter of which close to the fixed die end corresponds to the outer diameter of the guide post, and the inner diameter of which away from the fixed die end is larger than the outer diameter of the guide post, and a guide sleeve having an inner diameter corresponding to the outer diameter of the guide post is coaxially embedded in the large diameter end of the stepped hole.

5. The die-casting mold capable of stable self-locking according to any one of claims 1 to 3, characterized in that: A bracket is provided corresponding to the installation of the driving unit on the movable mold frame, and two ends of the bracket are connected to the side wall surface of the mold frame through a plurality of connecting frames.

6. The die-casting mold capable of stable self-locking according to claim 5, characterized in that: The connecting end is connected to the output shaft of the driving unit via a connecting sleeve, and the outer diameter of the connecting sleeve is larger than the outer diameter of the connecting end; Correspondingly, a limiting step is formed at the end of the locking hole, which is used for axial limiting of the toothed movable block when it is driven close to the toothed guide column.

7. The die-casting mold capable of stable self-locking according to any one of claims 1 to 3 and 6, characterized in that: The opening dimensions of the annular grooves are the same, and the opening intervals between two adjacent annular grooves are the same.

8. The die-casting mold capable of stable self-locking according to any one of claims 1 to 3 and 6, characterized in that: The driving unit is a hydraulic cylinder.

9. The die-casting mold capable of stable self-locking according to any one of claims 1 to 3 and 6, characterized in that: The die-casting mold is of square structure, and toothed guide pillars are respectively arranged at the four corners of the fixed mold of the die-casting mold, and a pair of self-locking components are respectively arranged at the four corners of the movable mold of the die-casting mold.

10. A die-casting method, which is performed using the die-casting mold capable of stable self-locking according to any one of claims 1 to 9, characterized in that: The process includes the following: Before mold closing, control each of the driving units to drive the corresponding toothed movable block to a position away from the guide post hole; Controlling the movable mold to move and start mold closing, so that the end of the toothed guide pin is embedded in the guide pin hole until the movable mold and the fixed mold are completely closed; Controlling each of the driving units to work, driving each toothed movable block toward the corresponding toothed guide post, until the end of each toothed movable block abuts against the outer periphery of the toothed guide post, and the concave-convex limiting structure at the end of the toothed movable block is just meshed and matched with the tooth groove structure on the outer periphery of the toothed guide post; Controlling each of the driving units to lock in place, completing the self-locking of the die-casting mold after the die-casting mold is closed; thereafter, injecting molding molten metal into the die-casting mold until the die-casting molding process of the component is completed; Before opening the mold, each of the driving units controls the corresponding toothed movable blocks to retreat, releasing the lock of the paired toothed movable blocks on both sides of the toothed guide pillars; thereafter, the movable mold is controlled to move away from the fixed mold to open the die-casting mold, completing the die-casting molding process of the parts.

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