A three-plate mold for casting

Abstract

The present invention relates to a three-plate mold for casting, comprising a movable mold plate, a fixed mold plate and a stripping plate, characterized in that it also includes a locking mechanism, which comprises an acting member connected to the stripping plate and a lock body connected to the movable mold plate or the fixed mold plate, the lock body is provided with a locking tongue that contacts the acting member, and the movable mold plate or the fixed mold plate arranged opposite to the lock body is provided with a first locking seat, the locking tongue cooperates with the first locking seat under the compulsion of the acting member to put the movable mold plate and the fixed mold plate in a locked state, and when the stripping plate moves forward to a first preset distance from the fixed mold plate, the acting member moves with the stripping plate to release the locking tongue from the first locking seat. The advantage of the present invention is that a lock body and a first locking seat are provided on the movable mold plate and the fixed mold plate, the locking tongue of the lock body cooperates with the first locking seat to put the movable mold plate and the fixed mold plate in a locked state, and when the stripping plate can be moved forward by the acting member, the locking tongue can be released from the first locking seat, thereby effectively avoiding sequence errors when opening the mold.

Description

Technical Field

[0001] The invention relates to the technical field of metal casting, in particular to a three-plate mold which is convenient for mold opening. Background Art

[0002] The three-plate mold is a special mold structure. Compared with the traditional two-plate mold that relies on a movable mold plate and a fixed mold plate to form a casting cavity, the three-plate mold is also provided with a movable stripper plate. For the specific structure of the three-plate mold, please refer to, for example, the "anti-sticking mold die casting three-plate mold" disclosed in Chinese patent ZL202320514593.8 and the "a three-plate mold convenient for placing metal inserts" disclosed in ZL202223394433.9.

[0003] In the above-mentioned mold structure, the fixed mold plate is usually located between the movable mold plate and the stripper plate, and a first feed port for injecting molten metal is provided on the stripper plate, and a second feed port connected to the casting cavity is provided on the fixed mold plate, and the first feed port and the second feed port are connected through a cross flow channel between the stripper plate and the fixed mold plate. For the commonly used feed channels of the three-plate mold, reference can be made to, for example, the “A method for rotary pouring and filling of barrel-shaped die-casting castings” disclosed in Chinese patent application CN202311124275.1. Compared with the traditional two-plate mold, the three-plate mold has a unique feeding method, which makes the residual feeding traces on the surface of the casting smaller, and can even achieve traceless molding, so it is often used for castings with high surface quality requirements.

[0004] However, despite the above advantages of three-plate molds, there are still the following defects in practical applications:

[0005] First, in order to form a qualified casting with good filling and uniform density, the feed liquid often leaves a margin, which causes the excess molten metal to overflow to the first feed port to form a cake, and the cake also includes the cooling metal connected to the casting in the cross runner. Therefore, before the movable platen and the fixed platen are opened to remove the casting, the cake needs to be separated from the casting first, so that the three-plate mold needs to follow a fixed mold opening sequence, that is, the stripper plate is separated from the fixed platen first to remove the cake from the casting, and the movable platen can be separated from the fixed platen and eject the casting. However, the traditional three-plate mold only relies on the tightening force of the casting itself to achieve the above mold opening sequence. Therefore, sometimes the movable platen and the fixed platen are separated first due to the excessive connection force between the cake and the casting, resulting in damage to the casting or even the mold.

[0006] The second and third plate molds not only need to consider the mold opening order during the mold opening process, but also need to follow a fixed mold closing order when closing the mold, that is, during the mold closing process, the movable mold plate and the fixed mold plate need to be aligned first, and then the stripper plate and the fixed mold plate are aligned. Otherwise, there may be situations such as the movable mold plate pushing the fixed mold plate to hit the stripper plate, causing damage to the mold. However, the traditional mold structure makes it difficult to ensure that the stripper plate and the fixed mold plate will not be closed prematurely due to external force before the movable mold plate and the fixed mold plate are closed.

[0007] Third, since the movable mold plate, fixed mold plate and stripper plate need to be opened and closed repeatedly, deviation is inevitable during long-term use, which will have a certain negative impact on the quality of the casting. In severe cases, the casting will be scrapped, resulting in an increase in the scrap rate of the casting.

[0008] Fourthly, the traditional three-plate mold usually relies on the pulling force when the stripper plate and the fixed mold plate are separated to forcibly break the connection between the biscuit and the casting. However, if the cross-flow channel or the second feed port has a large cross-sectional area, the connection between the biscuit and the casting may be too strong, which will cause deformation of the casting during the removal of the biscuit. Summary of the invention

[0009] The first technical problem to be solved by the present invention is to provide a three-plate mold which can avoid sequence errors when opening the mold in view of the above-mentioned existing technical status.

[0010] The second technical problem to be solved by the present invention is to provide a three-plate mold which can avoid sequence errors when closing the molds in view of the above-mentioned existing technical status.

[0011] The third technical problem to be solved by the present invention is to provide a three-plate formwork that can avoid offset between the formworks in view of the above-mentioned existing technical status.

[0012] The fourth technical problem to be solved by the present invention is to provide a three-plate mold capable of avoiding deformation of the casting during the process of removing the material cake in view of the above-mentioned existing technical status.

[0013] The technical solution adopted by the present invention to solve the first technical problem is: the three-plate mold for casting includes a movable platen and a fixed platen, the movable platen can move forward to form a casting cavity with the fixed platen, and also includes a stripper plate located in front of the fixed platen, and also includes:

[0014] A first feed port, provided on the stripper plate, for injecting molten metal;

[0015] A second feed port, located on the fixed mold plate and connected to the casting cavity;

[0016] A transverse flow channel, formed by the fixed mold plate and the stripper plate, for connecting the first feed port and the second feed port;

[0017] It is characterized in that it also includes a locking mechanism for controlling the mold opening sequence, and the locking mechanism includes:

[0018] An action member connected to the stripping plate so as to move with the stripping plate;

[0019] A lock body connected to the movable plate or the fixed plate, and provided with a lock tongue that contacts the action member;

[0020] A first lock seat is located on a movable plate or a fixed plate arranged opposite to the lock body, and the lock tongue cooperates with the first lock seat under the compulsion of the action member to put the movable plate and the fixed plate in a locked state;

[0021] When the stripping plate moves forward to a first preset distance from the fixed die plate so that the material cakes previously formed by the molten metal on the first feed port and the cross flow channel can fall off, the acting member moves with the stripping plate so that the locking tongue is released from the first locking seat to switch the movable die plate and the fixed die plate to an active state.

[0022] In order to solve the second technical problem, preferably, the action member includes a second lock seat located behind the lock tongue, and correspondingly, an action portion is also provided on the first lock seat, and when the movable template moves backward to the state of opening the mold with the fixed template, the action portion forces the lock tongue to be inserted into the second lock seat, thereby switching the fixed template and the stripper plate to a locked state. Since the material cake can fall off when the stripper plate moves forward to the state of being a first preset distance away from the fixed template, the movable template and the fixed template can perform a mold opening action at this time, but in order to avoid errors in the mold closing sequence, that is, to avoid the stripper plate from moving backward to mate with the fixed template when the movable template and the fixed template are in the mold opening state, an action portion is also provided on the first lock seat to force the lock tongue to be inserted into the second lock seat, so that the fixed template and the stripper plate enter a locked state.

[0023] In order to achieve that the fixed template and the stripper plate can maintain a locked state, preferably, a limiter is further provided on the lock body, and when the movable template moves backward to the state of opening the mold with the fixed template, the limiter can make the lock tongue contact the second lock seat, so that the fixed template and the stripper plate can maintain a locked state. If the limiter is not provided, even if the lock tongue enters the second lock seat, it may still be separated under the action of external force, so the limiter needs to be provided to contact the lock tongue, so that the lock tongue always cooperates with the second lock seat, thereby enabling the fixed template and the stripper plate to maintain a locked state.

[0024] In order to enable the locking mechanism to control the sequence of mold opening and closing, preferably, the locking mechanism also includes a rod connected to the movable mold plate, and the front section side wall of the rod is at least partially recessed to form the first locking seat and the action part. Correspondingly, the action part covers the rod and the lock tongue and is recessed to form a sliding groove for the two to slide, and the lock tongue is located between the inner wall of the sliding groove and the first lock seat, and the inner wall of the sliding groove is at least partially recessed behind the lock tongue to form the second lock seat, and a second preset distance is left between the second lock seat and the lock tongue, and the second preset distance is equal to the first preset distance. The first lock seat is located on the rod connected to the movable template, and the lock body and the lock tongue are located on the fixed template. The front section of the side wall of the rod is recessed to form the first lock seat and the action part, so that when the rod moves backward with the movable template, the action part can force the lock tongue to move toward the inner wall of the slide groove, and the second preset distance left between the second lock seat and the lock tongue is equal to the first preset distance. Then, when the stripping plate moves forward to the first preset distance away from the fixed template, the lock tongue can move toward the inner wall of the slide groove under the force of the action part and be inserted into the second lock seat.

[0025] In order to realize that the limiting member can keep the fixed template and the stripping plate in a locked state, preferably, the limiting member is arranged between the first lock seat and the lock body and conflicts with the rod, and an elastic member is also arranged between the limiting member and the lock body, and the elastic member makes the limiting member always have a tendency to move toward the rod, and correspondingly, the limiting member is at least partially recessed to form a first recess adapted to the lock tongue, and when the movable template moves backward to the state of opening the mold with the fixed template, the limiting member moves toward the lock tongue under the action of the elastic member, so that the lock tongue is clamped between the second lock seat and the first recess. The limiting member is located between the first lock seat and the lock body and conflicts with the rod, that is, it is similar to being pressed on the lock body by the rod, so when the rod moves backward with the movable template, the limiting member no longer conflicts with the rod and moves toward the lock tongue under the action of the elastic member, and finally the lock tongue is clamped between the second lock seat and the first recess, so that the stripping plate and the fixed template remain in a locked state.

[0026] In order to realize that when the movable template moves forward to the state where it is in mold engagement with the fixed template, the stripper plate and the fixed template can be switched to an active state, preferably, the limiter includes a contact surface for contacting the rod, and correspondingly, the front end of the rod includes an inclined surface extending from front to rear and inclined toward the limiter, and when the movable template moves forward to the state where it is in mold engagement with the fixed template, the inclined surface forces the contact surface together with the limiter to move toward the lock body, thereby switching the fixed template and the stripper plate to an active state. Such a design is made in consideration that the limiter moves toward the lock tongue by the action of the elastic member, and therefore, by providing the above-mentioned inclined surface at the front end of the rod, the limiter can be forced to move toward the lock body during the process of the rod moving forward with the movable template, thereby overcoming the action force of the elastic member, so that the limiter no longer clamps the lock tongue in the second lock seat, and the stripper plate and the fixed template are switched to an active state.

[0027] In order to reduce the wear of the action part of the rod, preferably, the contact surface and the first recess are at least partially recessed to form a second recess, and when the lock tongue locks the first lock seat, the lock tongue and the second recess abut against each other, thereby leaving a gap between the lock tongue and the first lock seat. Since the action part of the rod forces the lock tongue to move to the second lock seat by direct contact, wear between the two is inevitable, and the second recess can leave a gap between the lock tongue and the first lock seat, thereby providing a buffer space before the action part contacts the lock tongue, thereby reducing the wear of the action part of the rod.

[0028] In order to solve the third technical problem, preferably, a guide post is further provided on the surface of the stripper plate adjacent to the locking mechanism, the guide post extends toward the movable platen and is at least partially inserted into the movable platen, and correspondingly, the movable platen, the fixed platen and the stripper plate are all provided with a groove for inserting the guide post. The guide post can move in the groove, thereby providing a guide for the relative movement between the movable platen, the fixed platen and the stripper plate to avoid deviation.

[0029] Furthermore, in order to make the guide post have a better guiding function, preferably, the groove is further provided with guide post sleeves located on both sides of the guide post along the width direction. The guide post sleeves can make the guide post have a more stable guiding function, and can also prevent the guide post from directly contacting the movable plate and the fixed plate, thereby avoiding the wear of the movable plate and the fixed plate, and slowing down the wear of the guide post.

[0030] In order to solve the fourth technical problem, preferably, a cutting mechanism for cutting the material cake is further provided between the fixed die plate and the stripper plate, the cutting mechanism comprising a driving source and a cutting knife, and the cutting knife is connected to the power output rod of the driving source. Compared with the traditional process of removing the material cake, the method of cutting the material cake by the cutting knife can replace the traditional "pulling off" and change to a more straightforward "cutting off" of the material cake, thereby avoiding deformation of the casting in the process of removing the material cake.

[0031] Compared with the prior art, the advantages of the present invention are that a lock body and a first lock seat are provided on the movable template and the fixed template, and the lock tongue of the lock body cooperates with the first lock seat to put the movable template and the fixed template in a locked state, and through the action piece connected to the stripping plate, when the stripping plate moves forward to a state where it is a first preset distance away from the fixed template, the lock tongue can be released from the first lock seat, thereby effectively avoiding sequence errors when opening the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of a three-plate mold in an embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a three-plate mold in which a stripping plate is in a stripping state according to an embodiment of the present invention;

[0034] Figure 3 It is a schematic diagram of the cross-sectional structure of a three-plate mold in an embodiment of the present invention;

[0035] Figure 4 It is a schematic diagram of the exploded structure of the locking mechanism in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of an exploded structure of the locking mechanism in another angle in an embodiment of the present invention;

[0037] Figure 6 It is a schematic diagram of the state of the locking mechanism in the initial state in the embodiment of the present invention;

[0038] Figure 7 It is a schematic diagram of the state in which the locking mechanism in the embodiment of the present invention is in the second state;

[0039] Figure 8 It is a schematic diagram of the state in which the locking mechanism in the embodiment of the present invention is in the final state;

[0040] Fig. 9 It is a schematic diagram of the cross-sectional structure of the lock body in an embodiment of the present invention;

[0041] Fig.10 It is a schematic cross-sectional structure diagram of the working member and the lock body in an embodiment of the present invention;

[0042] Fig.11Schematic diagram of the structure of the gap between the rod and the lock tongue in an embodiment of the present invention;

[0043] Fig.12 It is a schematic diagram of the state in which the rod and the limiter are in the mold opening state in the embodiment of the present invention;

[0044] Fig.13 It is a schematic diagram of the state in which the rod and the limit member are in the second state in the embodiment of the present invention;

[0045] Fig.14 It is a schematic diagram of the state in which the rod and the limiter are in the mold closing state in the embodiment of the present invention;

[0046] Fig.15 It is a structural schematic diagram of the three-plate mold at another angle when the stripping plate is in the stripping state according to an embodiment of the present invention;

[0047] Fig.16 It is a schematic diagram of the cross-sectional structure of the three-plate mold at another angle in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with specific embodiments.

[0049] like Figures 1 to 16 The preferred embodiment of the present invention is shown. Figures 1 to 3In this embodiment, the three-plate mold used for casting includes a movable mold plate 11 and a fixed mold plate 12. The movable mold plate 11 can move forward to be matched with the fixed mold plate 12 to form a casting cavity C. It also includes a stripper plate 13 located in front of the fixed mold plate 12. A first feed port 131 for injecting molten metal and a second feed port 121 located on the fixed mold plate 12 and connected to the casting cavity C are provided on the stripper plate 13. A cross flow channel 132 for connecting the first feed port 131 and the second feed port 121 is also formed between the fixed mold plate 12 and the stripper plate 13. The three-plate mold also includes a locking mechanism 2 for controlling the mold opening sequence, the locking mechanism 2 includes an acting member 21 connected to the stripper plate 13 so as to move with the stripper plate 13, a lock body 22 is connected to the fixed mold plate 12, and a lock tongue 23 is provided on the lock body 22 to interfere with the acting member 21, and a first lock seat 24 is provided on the movable mold plate 11, and the lock tongue 23 cooperates with the first lock seat 24 under the compulsion of the acting member 21, so that the movable mold plate 11 and the fixed mold plate 12 are in a locked state. When the stripper plate 13 moves forward to a first preset distance d1 from the fixed mold plate 12, so that the material cake A formed by the previous metal melt on the first feed port 131 and the cross runner 132 can fall off, the acting member 21 moves with the stripper plate 13, so that the lock tongue 23 is released from the first lock seat 24, so as to switch the movable mold plate 11 and the fixed mold plate 12 to an active state. It should be noted that the first preset distance between the stripper plate 13 and the fixed plate 12 should ensure sufficient distance to allow the cake A to fall off smoothly. On the other hand, in the case of a large casting, due to the limited space of casting equipment such as a die-casting machine, if the stripper plate 13 is separated from the fixed plate 12 by too far, sometimes the remaining space will not be enough to remove the casting. In addition, the three-plate mold in this scheme can not only control the mold opening sequence, but also control the mold closing sequence. Specifically, the action member 21 includes a second lock seat 211 located behind the lock tongue 23. Correspondingly, an action portion 241 is also provided on the first lock seat 24. When the movable plate 11 moves backward to the state of opening the mold with the fixed plate 12, the action portion 241 forces the lock tongue 23 to be inserted into the second lock seat 211, thereby switching the fixed plate 12 and the stripper plate 13 to a locked state. In order to prevent the lock tongue 23 and the second lock seat 211 from being separated due to external force, a limit member 221 is further provided on the lock body 22. When the movable template 11 moves backward to the state of opening the mold with the fixed template 12, the limit member 221 can make the lock tongue 23 contact the second lock seat 211, so that the fixed template 12 and the stripping plate 13 always remain in a locked state.

[0050] Regarding the specific structure of the locking mechanism, such as Figures 4 and 5As shown, the locking mechanism 2 also includes a rod 25 connected to the movable template 11, and the front side wall of the rod 25 is at least partially recessed to form a first lock seat 24 and an action portion 241. Correspondingly, the action member 21 covers the rod 25 and the lock tongue 23 and is recessed to form a slide groove 212 for the two to slide. The lock tongue 23 is located between the inner wall of the slide groove 212 and the first lock seat 24. The inner wall of the slide groove 212 is at least partially recessed behind the lock tongue 23 to form a second lock seat 211. A second preset distance d2 is left between the second lock seat 211 and the lock tongue 23, and the second preset distance d2 is equal to the first preset distance d1. Figure 6 As shown, at this time, the locking mechanism 2 is in the initial state, that is, the lock tongue 23 and the first lock seat 24 cooperate, the movable plate 11 and the fixed plate 12 are in the locked state, as the action member 21 moves forward with the stripper plate 13, the dotted line in the figure indicates the moving direction of the action member 21; the locking mechanism 2 enters as shown Figure 7 In the second state shown in FIG. 1 , since the second preset distance d2 between the second lock seat 24 and the lock tongue 23 is equal to the first preset distance d1, the position of the second lock seat 211 corresponds to the lock tongue 23. When the rod 25 moves backward with the movable template 11, the dotted line in the figure indicates the moving direction of the rod 25. The action portion 241 can force the lock tongue 23 to move toward the inner wall of the slide groove 212. Finally, the locking mechanism 200 is entered as shown in FIG. Figure 8 In the final state shown, the locking tongue 23 is inserted into the second locking seat 211 , and at the same time, the limiting member 221 keeps the locking tongue 23 inserted into the second locking seat 211 .

[0051] As for the specific structure of the limiting member 221, Figures 9-10 As shown, the limit member 221 is arranged between the first lock seat 24 and the lock body 22 and conflicts with the rod 25, and an elastic member 222 is also provided between the limit member 221 and the lock body 22. The elastic member 222 makes the limit member 221 always have a tendency to move toward the rod 25. Correspondingly, the limit member 221 is at least partially recessed to form a first recess 223 adapted to the lock tongue 23. When the movable template 11 moves backward to the state of opening the mold with the fixed template 12, the limit member 221 moves toward the lock tongue 23 under the action of the elastic member 222, so as to clamp the lock tongue 23 between the second lock seat 211 and the first recess 223. The stopper 221 is located between the first lock seat 24 and the lock body 22 and contacts the rod 25, that is, it is similar to being pressed on the lock body 22 by the rod 25. Therefore, when the rod 25 moves backward with the movable template 11, the stopper 221 no longer contacts the rod 25 and moves toward the lock tongue 24 under the action of the elastic member 222, thereby finally clamping the lock tongue 23 between the second lock seat 24 and the first recess 223, so that the stripper plate 13 and the fixed template 12 remain in a locked state. Fig.11As shown, the contact surface 224 and the first recess 223 are at least partially recessed to form a second recess 225. When the lock tongue 23 locks the first lock seat 24, the lock tongue 23 and the second recess 225 are in contact with each other, thereby leaving a gap 226 between the lock tongue 23 and the first lock seat 24. Since the action portion 241 of the rod 25 forces the lock tongue 23 to move to the second lock seat 211 by direct contact, wear will inevitably occur between the two. The second recess 225 can leave a gap 226 between the lock tongue 23 and the first lock seat 24, thereby providing a buffer space before the action portion 241 contacts the lock tongue 23, thereby slowing down the wear of the action portion 241 of the rod 25.

[0052] On the contrary, in order to achieve that the stripper plate 13 and the fixed plate 12 can switch to the active state when the movable plate 11 moves forward to the state of being molded with the fixed plate 12, the limit member 221 includes a contact surface 224 for interfering with the rod 25, and correspondingly, the front end of the rod 25 includes an inclined surface 251 extending from front to rear and inclined toward the limit member 221. When the movable plate 11 moves forward to the state of being molded with the fixed plate 12, the inclined surface 251 forces the contact surface 224 together with the limit member 221 to move toward the lock body 22, thereby switching the fixed plate 12 and the stripper plate 13 to the active state. Such design is based on the consideration that the stopper 221 moves toward the lock tongue 23 by the action of the elastic member 222. Therefore, by providing the above-mentioned inclined surface 251 at the front end of the rod 25, the stopper 221 can be forced to move toward the lock body 22 during the process of the rod 25 moving forward with the movable template 11, thereby overcoming the action of the elastic member 222, so that the stopper 221 no longer clamps the lock tongue 23 in the second lock seat 211, and the stripper plate 13 and the fixed template 12 are switched to the active state. The specific process is as follows: Fig.12 As shown, at this time, the movable template 11 and the fixed template 12 are in the mold opening state, and the limit member 221 is driven by the elastic member 222 to clamp the lock tongue 23 on the second lock seat 211, and the rod 25 moves forward with the movable template 11; the dotted line in the figure indicates the moving direction of the rod 25, as shown in FIG. Fig.13 As shown, the inclined surface 251 contacts the contact surface 224 and forces the stopper 221 to overcome the action of the elastic member 222 and move toward the lock body 22; finally, the lock body 22 is moved into the position shown in FIG. Fig.14 In the mold closing state shown, the first recess 223 can no longer contact the locking tongue 23 .

[0053] In addition to the above structure, there are two other parts, such as Figures 15 and 16As shown, first, a guide post 3 is also provided on the surface of the stripper plate 13 adjacent to the locking mechanism 2, and the guide post 3 extends toward the movable template 11 and is at least partially inserted on the movable template 11. Correspondingly, the movable template 11, the fixed template 12 and the stripper plate 13 are all provided with a groove 31 for inserting the guide post 3. The guide post 3 can move in the groove 31, thereby providing a guiding effect on the relative movement between the movable template 11, the fixed template 12 and the stripper plate 13 to avoid deviation. Further, in order to make the guide post 3 have a better guiding effect, a guide post sleeve 32 is also provided on the groove 31 and is located on both sides of the guide post 3 along the width direction. On the one hand, the guide post sleeve 32 has the effect of making the guide post 3 have a more stable guiding effect, and on the other hand, it can also prevent the guide post 3 from directly contacting the movable template 11 and the fixed template 12, thereby avoiding the wear of the movable template 11 and the fixed template 12, and at the same time slowing down the wear of the guide post 3. Second, a cutting mechanism 4 for cutting the material cake A is provided between the fixed die plate 12 and the stripper plate 13. The cutting mechanism 4 includes a driving source 41 and a cutting knife 42. The cutting knife 42 is connected to a power output rod 411 of the driving source 41. Compared with the traditional process of removing the material cake A, the method of cutting the material cake A by the cutting knife 42 can replace the traditional "pulling off" and change to a more straightforward "cutting off" of the material cake A, thereby avoiding deformation of the casting in the process of removing the material cake A.

Claims

1. A three-plate mold for casting, comprising a movable platen (11) and a fixed platen (12), wherein the movable platen (11) can move forward to be in contact with the fixed platen (12) to form a casting cavity (C), and further comprising a stripper plate (13) located in front of the fixed platen (12), and further comprising: A first feed port (131) is provided on the stripping plate (13) and is used for injecting molten metal; A second feed port (121), located on the fixed mold plate (12) and connected to the casting cavity (C); A transverse flow channel (132), formed by the fixed die plate (12) and the stripper plate (13), and used for connecting the first feed port (131) and the second feed port (121); It is characterized in that It also includes a locking mechanism (2) for controlling the mold opening sequence, and the locking mechanism (2) includes: An action member (21) connected to the stripping plate (13) so as to move with the stripping plate (13); A lock body (22) is connected to the movable plate (11) or the fixed plate (12), and a lock tongue (23) is provided on the lock body (22) to abut against the action member (21); A first lock seat (24) is located on a movable die plate (11) or a fixed die plate (12) arranged opposite to the lock body (22); the lock tongue (23) cooperates with the first lock seat (24) under the compulsion of the action member (21) to put the movable die plate (11) and the fixed die plate (12) in a locked state; When the stripper plate (13) moves forward to a first preset distance (d1) from the fixed die plate (12), so that the material cake (A) previously formed by the molten metal on the first feed port (131) and the cross flow channel (132) can fall off, the action member (21) moves with the stripper plate (13), so that the locking tongue (23) is released from the first locking seat (24), so as to switch the movable die plate (11) and the fixed die plate (12) to an active state; The action member (21) comprises a second lock seat (211) located behind the lock tongue (23); correspondingly, an action portion (241) is also provided on the first lock seat (24); when the movable die plate (11) moves backward to a state of being opened with the fixed die plate (12), the action portion (241) forces the lock tongue (23) to be inserted into the second lock seat (211), thereby switching the fixed die plate (12) and the stripper plate (13) to a locked state; The lock body (22) is also provided with a limiting member (221), and when the movable die plate (11) moves backward to a state of being in mold opening with the fixed die plate (12), the limiting member (221) can cause the locking tongue (23) to contact the second locking seat (211), thereby keeping the fixed die plate (12) and the stripping plate (13) in a locked state; The locking mechanism (2) further comprises a rod (25) connected to the movable template (11); a front side wall of the rod (25) is at least partially recessed to form the first lock seat (24) and the action portion (241); correspondingly, the action member (21) covers the rod (25) and the lock tongue (23) and is recessed to form a slide groove (212) for the two to slide; the lock tongue (23) is located between the inner wall of the slide groove (212) and the first lock seat (24); and the inner wall of the slide groove (212) is at least partially recessed behind the lock tongue (23) to form the second lock seat (211); The limiting member (221) is arranged between the first lock seat (24) and the lock body (22) and contacts the rod (25), and an elastic member (222) is also arranged between the limiting member (221) and the lock body (22), and the elastic member (222) enables the limiting member (221) to always have a tendency to move toward the rod (25). Correspondingly, the limiting member (221) is at least partially recessed to form a first recess (223) adapted to the lock tongue (23). When the movable template (11) moves backward to a state of opening the mold with the fixed template (12), the limiting member (221) moves toward the lock tongue (23) under the action of the elastic member (222), so that the lock tongue (23) is clamped between the second lock seat (211) and the first recess (223); The limiting member (221) comprises a contact surface (224) for contacting the rod (25); correspondingly, the front end of the rod (25) comprises an inclined surface (251) extending from front to rear and inclined toward the limiting member (221); when the movable die plate (11) moves forward to a state where it is molded with the fixed die plate (12), the inclined surface (251) forces the contact surface (224) together with the limiting member (221) to move toward the lock body (22), thereby switching the fixed die plate (12) and the stripper plate (13) to an active state; A second recess (225) is at least partially recessed between the contact surface (224) and the first recess (223); when the lock tongue (23) locks the first lock seat (24), the lock tongue (23) and the second recess (225) abut against each other, thereby leaving a gap (226) between the lock tongue and the first lock seat (24).

2. The three-plate mold according to claim 1, characterized in that: A second preset distance (d2) is left between the second lock seat (211) and the lock tongue (23), and the second preset distance (d2) is equal to the first preset distance (d1).

3. The three-plate mold according to claim 1 or 2, characterized in that: A guide post (3) is also provided on the surface of the stripping plate (13) adjacent to the locking mechanism (2), and the guide post (3) extends toward the movable plate (11) and is at least partially inserted into the movable plate (11). Correspondingly, the movable plate (11), the fixed plate (12) and the stripping plate (13) are all provided with a groove (31) for inserting the guide post (3).

4. The three-plate mold according to claim 3, characterized in that: The groove (31) is also provided with guide column sleeves (32) located on both sides of the guide column (3) along the width direction.

5. The three-plate mold according to claim 1 or 2, characterized in that: A cutting mechanism (4) for cutting the material cake (A) is also provided between the fixed die plate (12) and the stripping plate (13). The cutting mechanism (4) comprises a driving source (41) and a cutting knife (42). The cutting knife (42) is connected to a power output rod (411) of the driving source (41).

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