A mold for automated production

Abstract

The application discloses a mold for automatic production, which comprises a front mold, a rear mold and a mold core top block. The front mold comprises a front mold core. The mold core top block is provided with a slot in the middle, and is sleeved outside the convex part of the rear mold core. The convex part of the rear mold core, the front mold core and the mold core top block cooperatively form a cavity. Limiting buckles are arranged on the opposite sides of the front mold core, and the front mold core is connected with the mold core top block through the limiting buckles. The application provides a high-efficiency mold for automatic production, which can complete ejection during the mold opening process, solves the problem of efficiency reduction caused by opening the mold first and then ejecting the product in the injection molding process, avoids the problems of efficiency reduction and waste caused by subsequent processes such as cutting off the gate and sorting, and meets the demand of automatic production. Through deformation processing of the point gate and step-by-step ejection, the efficiency can be further improved while ensuring the surface forming quality of the product.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to a mold for automated production. Background Technology

[0002] Molds, often called the "mother of industry," are specialized tools used to assist in the shaping of metal or non-metal materials. Injection molding is a commonly used mold forming process, especially in the processing and production of plastic products, allowing for the one-time molding of products with complex shapes and structures. An injection mold generally consists of two parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, while the fixed mold is mounted on the fixed platen. During injection molding, the moving and fixed molds close to form the gating system and cavity. After injection, the moving and fixed molds separate, and the product is removed using an ejector mechanism. Point gates are a type of injection mold gate, offering advantages such as small gate marks, no need for subsequent processing, and flexible gate location selection, making them a commonly used method in engineering.

[0003] After the mold is formed, the product needs to be ejected. Current technology generally uses a method of opening the mold first and then ejecting. Furthermore, after ejection, the gate often needs to be manually cut to separate the product from the runner, resulting in wasted manpower and time. Ejecting the product and runner together can easily cause spring-loaded or pulled marks at the gate. Using ejector pins can also easily cause surface quality problems such as whitening. Alternatively, a method of cutting within the mold is used in practice, but this method results in a more complex mold structure, increasing the difficulty of mold design and manufacturing, and significantly increasing costs. In addition, after the product and runner are demolded simultaneously, a separate process is needed to sort them, which also affects the efficiency of automated production. Summary of the Invention

[0004] The purpose of this invention is to provide a mold for automated production to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides a mold for automated production, the mold comprising a front mold and a rear mold, characterized in that it further comprises a mold core top block; the front mold includes a front mold core; the rear mold includes a rear mold core and a runner ejection assembly; the upper surface of the rear mold core is provided with a protruding mold part; the mold core top block has a slot in the middle, and the mold core top block is fitted outside the protruding mold part of the rear mold core; the protruding mold part of the rear mold core, the front mold core, and the mold core top block cooperate to form a cavity; a limit buckle is provided on the opposite side of the front mold core and is connected to the mold core top block through the limit buckle.

[0006] Preferably, the limiting buckle includes a limiting plate and a limiting protrusion; the limiting plate is provided with an elongated slot, and the top of the limiting plate is fixed to the side of the front mold core; the limiting protrusion is fixed to the side of the top block of the mold core and extends into the elongated slot.

[0007] Preferably, the upper surface of the protruding part mold portion is provided with a rear runner groove and a cavity structure; the lower surface of the front mold core is provided with a front runner groove and a cavity groove, the size of which is larger than the outer contour size of the protruding part mold portion; a slot is provided in the middle of the top block of the mold core, the shape and size of which are consistent with the outer contour of the protruding part mold portion; the cavity structure of the protruding part mold portion, the cavity groove of the front mold core, and the upper side of the top block of the mold core near the protruding part mold portion constitute the cavity.

[0008] Preferably, the front runner groove on the lower surface of the front mold core is not connected to the cavity groove; the rear runner groove of the rear mold core is connected to the cavity through a runner hole.

[0009] Preferably, the mold core guide post passes through the top block of the mold core, the front mold core, and the rear mold core.

[0010] Preferably, a number of resin plugs are provided between the top block of the mold core and the rear mold core.

[0011] Preferably, the flow channel condensate ejection assembly includes a plurality of ejector pins, an ejector pin plate pusher plate, and an ejector pin plate cover plate, wherein the ejector pin plate cover plate is disposed on the top side of the ejector pin plate pusher plate.

[0012] This invention provides a high-efficiency mold for automated production, which completes ejection during the mold opening process. This solves the efficiency reduction caused by opening the mold before ejecting the product in injection molding, and avoids the efficiency reduction and waste caused by subsequent processes such as gate cutting and sorting, thus meeting the needs of automated production. By deforming the gate and performing multiple ejections, efficiency can be further improved while ensuring the surface molding quality of the product.

[0013] In addition, the simple mold structure involved in this invention avoids problems such as increased mold volume and increased difficulty and cost in mold design and manufacturing due to the use of complex structures. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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 creative effort.

[0015] Figure 1 This is a front view of the injection mold of this invention patent;

[0016] Figure 2 This is a cross-sectional view of the injection mold of this invention from one angle.

[0017] Figure 3 This is an exploded view of the injection mold of this invention patent;

[0018] Figure 4 This is a partial perspective view of the injection mold of this invention patent;

[0019] Figure 5 This is a partial cross-sectional view of the injection mold of this invention patent;

[0020] Figure 6 This is a perspective view of the rear mold core of this invention patent;

[0021] Figure 7 This is a partially enlarged schematic diagram of the rear mold core of this invention patent;

[0022] Figure 8 This is a schematic diagram of the bottom surface of the front mold core of this invention patent;

[0023] Figure 9 This is a sectional view of the injection mold of this invention, rotated at an angle.

[0024] Figure 10 This is a schematic diagram of the injection mold opening process of this invention patent;

[0025] Figure 11 This is a schematic diagram of an injection-molded product and runner material according to an embodiment of the present invention.

[0026] Figure 12 This is an enlarged cross-sectional view of a portion of the rear mold core according to an embodiment of the present invention.

[0027] Figure 13 This is a schematic diagram of the driving and control structure of one embodiment of the present invention.

[0028] The following are the reference numerals in the accompanying drawings: 1. Locating ring; 2. Sprue sleeve; 3. Inlet / outlet nozzle; 4. Resin plug; 5. Solidifying component; 6. Ejector pin; 7. Limiting buckle; 8. Front mold guide sleeve; 9. Rear mold pad; 10. Rear mold support rod; 11. Rear mold fixing plate; 12. Ejector rod; 13. Rear mold guide pillar; 14. Gasket; 15. Ejector plate push plate; 16. Rear mold guide sleeve; 17. Ejector plate cover plate; 18. Circular limiting block; 19. Rear mold reset rod; 20. Rear mold base plate; 21. Rear mold core; 22. Mold core ejector block; 23. Mold core guide pillar; 24. Front mold core; 25. Front mold reset rod; 26. Front mold base plate; 27. Front mold guide pillar. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] As attached Figure 1-11 As shown, the present invention relates to an automated production mold, the mold comprising a front mold and a rear mold, the front mold being used to fit against the rear mold.

[0031] As attached Figure 1 , 2 As shown in Figure 3, the front mold includes a positioning ring 1, a sprue sleeve 2, a front mold base plate 26, a front mold core 24, a front mold guide post 27, and a front mold reset rod 25. The rear mold includes a rear mold core 21, a rear mold base plate 20, a rear mold pad plate 9, a rear mold support rod 10, a rear mold guide post 13, and a runner solidification ejection assembly N.

[0032] The positioning ring 1 is fixed on the front mold base plate 26, the front mold guide post 27 passes through and is fixed on the front mold base plate 26, the front mold core 24 is fixed on the lower end of the front mold base plate 26, the sprue sleeve 2 is fixed on the front mold base plate 26 and passes through the front mold base plate 26 and the front mold core 24, and the lower end of the front mold base plate 26 is also fixed with the front mold reset rod 25.

[0033] The rear mold core 21 is set on the rear mold base plate 20. The rear mold base plate 20 has holes and is equipped with a front mold guide sleeve 8 so that the front mold guide post 27 can pass smoothly. The rear mold support rod 10 and the rear mold pad 9 are set on the rear mold fixing plate 11. The two together support the rear mold base plate 20.

[0034] As attached Figure 4-10 As shown, the upper surface of the rear mold core 21 is provided with a protruding mold portion 211, and the upper surface of the protruding mold portion 211 is provided with a rear runner groove 214 and a cavity structure 212. The cavity structure 212 is designed according to the specific shape of the product and can correspond to one or more products, including structures such as protrusions and grooves. (See attached image) Figure 11 This is a schematic diagram of an injection-molded product and runner material according to an embodiment of the present invention.

[0035] The top block 22 of the mold core has a slot in the middle. The shape and size of the slot are consistent with the outer contour of the protruding part mold part 211, that is, the top block 22 of the mold core can be fitted on the outside of the protruding part mold part 211 of the rear mold core 21.

[0036] The lower surface of the front mold core 24 is provided with a front flow channel groove 241 and a cavity groove 242, the size of which is larger than the outer contour size of the protruding mold part 211.

[0037] After the mold is closed, the cavity structure 212 of the protruding part mold part 211, the cavity groove 242 of the front mold core 24, and the upper side of the mold core top block 22 near the protruding part mold part 211 constitute the cavity of the product to be molded. The mold core top block 22 contacts the bottom of the product, and the three together complete the molding of the injection molded product.

[0038] Furthermore, the rear runner groove 214 of the rear mold core 21 is connected to the cavity through the runner hole 213, while the front runner groove 241 on the lower surface of the front mold core 24 is not connected to the cavity groove 242. When the product is demolded, the runner hole 213 will break the product gate under the action of demolding force, thereby separating the product from the runner solidified material.

[0039] The gate between the runner and the product cavity is a deformation point gate, which extends into the core and contacts the product. A ejector pin is set near the gate and serves as a cold slug well.

[0040] The front mold also includes a guiding mechanism, which consists of a front mold guide post 27 and a mold core guide post 23. The front mold guide post 27 passes through and is fixed inside the front mold guide sleeve 8 provided in the guide holes of the front mold base plate 26 and the rear mold base plate 20. The mold core guide post 23 is provided on the front mold core 24 and passes through the mold core top block 22 and the rear mold core 21 to ensure the fitting accuracy of the three.

[0041] A limiting buckle 7 is provided on the opposite side of the front mold core 24 and is connected to the mold core top block 22 through the limiting buckle 7. The limiting buckle 7 includes a limiting plate 71 and a limiting protrusion 72. The limiting plate 71 is provided with an elongated slot 711. The top of the limiting plate 71 is fixed to the side of the front mold core 24 by bolts. The limiting protrusion 72 is fixed to the side of the mold core top block 22 and extends into the slot of the elongated slot 711. The limiting protrusion 72 is a bolt provided on the side of the mold core top block 22.

[0042] During mold opening, the front mold core 24 separates from the rear mold. The product and runner remain in the rear mold due to the undercut of the core and runner protrusions, separating from the front mold. Upon reaching the set stroke, the limit stop 7 reaches the preset stroke, achieving "linkage" between the front mold core 24 and the mold core ejector block 22, meaning they remain "relatively stationary." Subsequent mold opening causes the rear mold core 21 to separate from the mold core ejector block 22. At this point, the product separates from the rear mold core 21 under the action of the mold core ejector block 22, completing demolding. Using the mold core ejector block 22 for demolding effectively avoids the "ejection whitening" defect compared to commonly used ejector pins. "Ejection whitening" is mainly caused by the small contact area of ​​ejector pins, which easily leads to surface defects like "ejection whitening" when ejecting the product. Using an ejector block for demolding, with its larger contact area, prevents this defect.

[0043] Because the runner is connected to the cavity through the runner hole 213 on the rear mold core, the runner hole 213 can break the product gate under the action of demolding force during product demolding, thus separating the product from the solidified runner material.

[0044] The solidified material in the runner remains in the rear mold, while the front and rear molds continue to separate, and the mold opening process is complete.

[0045] As attached Figure 3 , 5 As shown, to prevent the mold core top block 22 and the rear mold core 21 from separating before the travel limit of the trigger stop 7 is triggered, a resin plug 4 is provided between the mold core top block 22 and the rear mold core 21. The resin plug 4 includes a fixing bolt 41 and a resin ring 42 disposed on the outside of the bolt. The fixing bolt 41 is threaded and fixed to the side of the mold core top block 22 or the rear mold core 21 where they meet, and is also fixed to the lower side of the mold core top block 22 as shown in the figure. A mating hole is provided at the position of the fixing bolt 41 corresponding to the position of the rear mold core 21 or the mold core top block 22. The mating hole and the resin ring 42 are interference fit. To facilitate the insertion of the resin ring 42, a necked section is provided at the end near the mating hole, and the size of the nut of the fixing bolt 41 is smaller than the size of the resin ring 42.

[0046] As attached Figure 1 , 2 As shown in Figures 3, 6, and 9, the runner solidified material ejection assembly N is mainly located between the rear mold base plate 20 and the rear mold fixing plate 11. The runner solidified material ejection assembly N includes several ejector pins 6, a reset rod, an ejector plate pusher 15, and an ejector plate cover 17. The ejector plate cover 17 is located on the top side of the ejector plate pusher 15.

[0047] The rear mold fixing plate 11 has a push rod 12 in the middle, and the push rod 12 is connected to a push plate 15. A push plate 15 is fixedly connected to a cover plate 17, and a push plate 17 is provided with push pins 6. The push pins 6 are positioned facing the runner, corresponding to the main runner (i.e., the area in the center of the sprue sleeve 2 corresponding to the runner) and the near end of the sprue (i.e., the side of the runner hole 213 near the rear runner groove 214). The main runner extends downward with a protruding undercut, and the upper end of the push pin 6 contacts the protruding undercut. The attached figure includes three push pins 6, corresponding to the main runner and two sprues respectively. Through holes for the push pins 6 to pass through are provided at the corresponding positions of the main runner and sprue of the rear mold core 21.

[0048] The ejector plate pusher 15 is connected to the front mold base plate 26 via a reset rod that passes through the ejector plate cover 17 and the rear mold base plate 20.

[0049] The reset rod includes a rear mold reset rod 19 and a front mold reset rod 25. The rear mold reset rod 19 passes through the ejector plate cover 17 and the rear mold base plate 20, and contacts the front mold reset rod 25 fixed on the front mold base plate 26.

[0050] When the ejection motion begins, the ejector pin 12, driven by the injection molding machine, moves the ejector plate pusher 15 and the ejector plate cover 17. The ejector pin 6 completes the demolding of the solidified material in the runner with a relatively short stroke. During mold closing, the front and rear mold cores and the mold core ejector block 22 close. The ejector plate pusher 15 and the ejector plate cover 17 are reset under the action of the front mold reset rod 25 and the rear mold reset rod 19. The rear mold base plate 20 is provided with a circular limit block 18 to reduce the ejection stroke and improve efficiency.

[0051] Because the mold is placed horizontally on the injection molding machine, after the mold core ejector block 22 pushes the product away from the rear mold core 21, the product falls under the influence of gravity. Then, the runner ejection component moves, causing the runner sprue to detach from the rear mold. During the demolding process, the product and the sprue fall sequentially. Two air nozzles are installed at the bottom of the mold to blow air as the product and runner sprue fall, allowing them to land at different positions for sorting. These air nozzles are auxiliary devices and not part of the mold's overall structure.

[0052] The rear mold also includes a rear mold support rod 10 and a rear mold guide post 13. The rear mold support rod 10 is located between the rear mold fixing plate 11 and the rear mold base plate 20. The rear mold support rod 10 and the rear mold pad 9 jointly support the weight of the rear mold base plate 20. The rear mold guide post 13 is located on the rear mold fixing plate 11 and passes through the rear mold fixing plate 11 and the rear mold guide sleeve 16 in the ejection device to the rear mold base plate 20.

[0053] The injection mold also includes a cooling device, which includes inlet and outlet water nozzles 3 and cooling water channels. The cooling water channels are respectively disposed inside the front mold core 24 and the rear mold core 21. The inlet and outlet water nozzles 3 are respectively disposed on one side of the front mold core 24 and the rear mold core 21 and are respectively connected to the cooling water channels.

[0054] As attached Figure 12 As shown, this is a partially enlarged schematic diagram of the flow channel hole 213 of the rear mold core in one embodiment of this application.

[0055] The runner hole 213 connects the rear runner groove 214 and the cavity. The runner hole 213 includes a through portion a and a transition portion b. The transition portion b is a slot that communicates with the rear runner groove 214. The through portion a is an irregular through hole that passes through the rear mold core between the transition portion b and the cavity. The cross-section of the through portion is trapezoidal, and the diameter of the hole on the side closer to the cavity is smaller than that on the side closer to the transition portion b. The lowest point of the opening of the through portion a on the side closer to the cavity is higher than the lowest point of the cavity (as shown in the attached figure). Figure 12 The area shown is e).

[0056] The above structure is conducive to the separation of the product from the solidified material located in the flow channel hole 213 during demolding. Specifically, during demolding, when the mold core top block 22 drives the product to separate from the rear mold core, since the lowest point of the opening on one side of the through part a cavity is higher than the lowest point of the cavity, this stress concentration point is conducive to the separation of solidified material under the action of external force.

[0057] To further optimize the demolding process described above, the demolding cylinder is controlled as follows: the demolding cylinder is used to push and separate the rear mold core 21, the front mold core 24, and the mold core ejector block 22. Its specific structure and configuration are conventional techniques in this field.

[0058] In the first stage, the product separates from the front mold core 24, and the speed of the demolding cylinder (piston rod extension speed) is gradually increased to avoid the adverse effects of rapid demolding on the surface morphology of the product.

[0059] The second stage is the empty stroke stage, which is when the front mold core 24 and the rear mold core 21 are separated and the limit buckle 7 has not reached the preset stroke, and the front mold core 24 and the mold core top block 22 have not achieved "linkage". This process does not involve the product demolding process from the rear mold core 21. The demolding cylinder speed is gradually increased. The demolding cylinder speed should not be too high in this stage to avoid a large impact when the limit protrusion 72 contacts the bottom of the long strip groove 711 on the limit plate 71.

[0060] In the third stage, when the limiting buckle 7 reaches the preset stroke, the mold core 24 and the mold core top block 22 begin to "link" together, that is, after the limiting protrusion 72 contacts the bottom of the long strip slot 711 on the limiting plate 71, the speed of the demolding cylinder suddenly increases within the stroke from the lowest point of the cavity to the lowest point of the opening on one side of the through part a cavity, and then quickly decreases to the normal speed, which is conducive to quickly extruding the solidified material in the runner hole 213 and realizing the separation of the product and the solidified material in the runner;

[0061] In the fourth stage, the demolding stage, the mold core ejector block 22 gradually separates from the rear mold core 21. Under the action of the mold core ejector block 22, the product separates from the rear mold core 21 and completes the demolding. In this stage, the demolding cylinder speed (piston rod extension speed) should not be too fast to avoid adverse effects on the surface morphology of the product caused by rapid demolding.

[0062] To achieve the above speed control, a stress plate g0 is provided at the bottom of the elongated slot 711 on the limiting plate 71 to detect the contact between the limiting protrusion 72 and the bottom of the elongated slot 711.

[0063] In addition to the commonly used oil supply and return lines, the demolding cylinder also includes a second oil supply line. The second oil supply line includes a second oil pump g1 and a solenoid valve g2. In addition, a control unit g3 is provided that is electrically connected to the stress plate g0, the second oil pump g1, and the solenoid valve g2.

[0064] The specific control method is as follows: The oil supply and return circuits of the demolding cylinder are controlled according to conventional methods in the field. Before the start of the third stage, the control unit g3 controls the second oil pump g1 to open at a preset time. When the stress plate g0 detects that the pressure reaches the first preset value, the control unit g3 controls the solenoid valve g2 to open, thereby realizing a sudden increase in pressure in the rodless chamber of the demolding cylinder. When the stress plate g0 detects that the pressure reaches the second preset value, the control unit g3 controls the second oil pump g1 and the solenoid valve g2 to close. Since the oil supply time of the second oil supply circuit is short, the pressure in the rodless chamber of the demolding cylinder will gradually drop in a short time after the sudden increase. This achieves a sudden increase in the speed of the demolding cylinder within the stroke from the lowest point of the cavity to the lowest point of the opening on one side of the through part a cavity, and then a rapid decrease to the normal speed. The preset time can be adaptively selected according to the site conditions. The longer the advance start time, the higher the hydraulic oil pressure entering from the second oil supply circuit after the solenoid valve g2 opens, which will result in a more significant increase in the speed of the demolding cylinder. A rigid pipe is connected between the second oil pump g1 and the solenoid valve g2, or a high-pressure hydraulic oil buffer storage unit is set up to ensure that it can support the storage of hydraulic oil with a certain pressure generated during the period from the opening of the second oil pump g1 to the opening of the solenoid valve g2. The first preset value can be the pressure detected by the stress plate g0 being greater than zero. The second preset value can be the maximum pressure value detected by the stress plate g0 during the demolding process obtained through experiments. Other pressure values ​​can also be selected according to the site conditions.

[0065] When the ejector pin 6 pushes the solidified material to separate, the presence of the transition section b facilitates an upward pull-out action towards the through-hole a of the runner hole 213, reducing the risk of solidified material breaking within the through-hole a. Furthermore, a buffer ejector rod c is provided at the front end of the ejector pin 6 near the gate (i.e., on the side of the runner hole 213 near the rear runner groove 214). The buffer ejector rod c is connected to the top of the ejector pin 6 via a spring d and can move under the action of the ejector pin 6. A downward cutting surface c1 is provided on the top of the buffer ejector rod c near the runner hole 213. During the ejection action, the spring buffer allows for a gradual increase in the speed of the buffer ejector rod c. Simultaneously, the cutting surface c1 ensures that the side of the buffer ejector rod c furthest from the runner hole 213 contacts the solidified material first, further reducing the risk of solidified material breaking within the through-hole a.

[0066] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A mold for automated production, the mold comprising a front mold and a rear mold, characterized in that, It also includes a mold core top block; the front mold includes a front mold core; the rear mold includes a rear mold core and a runner slurry ejection assembly; the upper surface of the rear mold core is provided with a protruding mold part; the mold core top block is provided with a slot in the middle, and the mold core top block is fitted outside the protruding mold part of the rear mold core; the protruding mold part of the rear mold core, the front mold core, and the mold core top block cooperate to form a cavity; Limiting buckles are provided on the opposite sides of the front mold core and are connected to the top block of the mold core through the limiting buckles; The upper surface of the protruding part mold part is provided with a rear flow channel groove and a cavity structure; the lower surface of the front mold core is provided with a front flow channel groove and a cavity groove; the cavity structure of the protruding part mold part, the cavity groove of the front mold core, and the upper side surface of the mold core top block near the protruding part mold part constitute a cavity. The front runner groove on the lower surface of the front mold core is not connected to the cavity groove; the rear runner groove of the rear mold core is connected to the cavity through a runner hole. The flow channel hole includes a through portion and a transition portion. The transition portion is a slot that communicates with the rear flow channel groove. The through portion is an irregular through hole that passes through the rear mold core between the transition portion and the cavity. The cross-section of the through portion is trapezoidal, and the hole diameter on the side closer to the cavity is smaller than that on the side closer to the transition portion. The lowest point of the opening of the through portion on the side closer to the cavity is higher than the lowest point of the cavity. The runner solidified material ejection assembly includes several ejector pins, ejector pin plate pushers, and ejector pin plate cover plates. The ejector pin plate cover plate is located on the top side of the ejector pin pusher plate. A buffer ejector rod is provided at the front end of the ejector pin near the gate, i.e., on the side of the runner hole close to the rear runner groove. The buffer ejector rod is connected to the top of the ejector pin by a spring. The top of the buffer ejector rod near the runner hole has a downward cutting surface. During the ejection action, the spring buffer can gradually increase the speed of the buffer ejector rod. At the same time, the cutting surface can ensure that the side of the buffer ejector rod away from the runner hole contacts the solidified material first, reducing the risk of solidified material breaking in the through-hole.

2. The mold for automated production according to claim 1, characterized in that, The limiting buckle includes a limiting plate and a limiting protrusion; the limiting plate is provided with an elongated slot, and the top of the limiting plate is fixed to the side of the front mold core; the limiting protrusion is fixed to the side of the top block of the mold core and extends into the elongated slot.

3. The mold for automated production according to claim 2, characterized in that, The size of the cavity groove is larger than the outer contour size of the protruding part mold part; the top block of the mold core is provided with a slot in the middle, and the shape and size of the slot are consistent with the outer contour of the protruding part mold part.

4. A method for controlling a demolding cylinder for an automated production mold according to claim 3, wherein the demolding cylinder is used to push and separate the rear mold core, the front mold core, and the mold core top block, characterized in that, The process includes the following steps: First, the product separates from the front mold core, and the speed of the demolding cylinder gradually increases; Second, the idle stroke stage, where the front mold core separates from the rear mold core and the limit buckle has not reached the preset stroke, and the front mold core and the mold core top block have not achieved "linkage", the speed of the demolding cylinder gradually increases; Third, when the limit buckle reaches the preset stroke and the front mold core and the mold core top block begin to achieve "linkage", the speed of the demolding cylinder suddenly increases within the stroke from the lowest point of the cavity to the lowest point of the opening on one side of the cavity of the through part, and then quickly decreases to the normal speed; Fourth, the demolding stage, the mold core top block gradually separates from the rear mold core, and the product separates from the rear mold core under the action of the mold core top block to complete the demolding.

5. The method for controlling the demolding cylinder of a mold for automated production according to claim 4, characterized in that, A stress plate is provided at the bottom of the long slot in the limiting plate. In addition to the commonly used oil supply and return lines, the demolding cylinder also includes a second oil supply line, which includes a second oil pump and a solenoid valve. A control unit electrically connected to the stress plate, the second oil pump, and the solenoid valve is also provided. The specific control method is as follows: Before the start of the third stage, the control unit controls the second oil pump to open. When the stress plate detects that the pressure reaches the first preset value, the control unit controls the solenoid valve to open, thereby realizing a sudden increase in pressure in the rodless chamber of the demolding cylinder. When the stress plate detects that the pressure reaches the second preset value, the control unit controls the second oil pump and the solenoid valve to close.

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