Die opening ejection device for die casting

Abstract

The utility model relates to the technical field of die-casting dies, in particular to a die-opening ejection device for die castings, which comprises a fixed die, a movable die positioned below the fixed die, a false slider system fixed on the movable die and a reverse thrust system fixed on the fixed die, the reverse pushing system comprises a positioning plate, a guide column fixed below the positioning plate, a pushing plate connected to the guide column in a sliding mode, a plurality of ejector rods fixed below the pushing plate and a pressure spring arranged on the guide column in a sleeving mode, the pressure spring is located between the positioning plate and the pushing plate, and the ejector rods are located at the end, with the larger size, of the cavity in the movable mold; the false sliding block system comprises an oil cylinder assembly and a false sliding block fixed to the driving end of the oil cylinder assembly, the front end of the false sliding block stretches into the edge of the end, with the smaller size, of the cavity in the movable mold, the tail end of the false sliding block is provided with an inclined face, the inclined face is provided with a locking block, the locking block is fixed to the fixed mold, and the locking block is used for preventing the false sliding block from retreating. According to the scheme, the problems of strain and deformation of the special-shaped structural part during demolding can be prevented, and the forming quality of the die casting is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of die casting mould, specifically to a die casting opening and ejection device. BACKGROUND

[0002] Die casting process is a process that molten metal is rapidly injected into a mold cavity under high pressure to form a die casting by cooling and solidification. After the die casting is formed in the mold cavity, the die casting needs to be ejected from the mold core with the help of an ejection device so as to take out the die casting.

[0003] Due to the complex structure of some die castings, there are not only numerous deep cavity structures, but also reinforcing ribs inside. The mold has too much holding force. Therefore, when the mold is opened, the die casting is easily damaged and deformed during ejection. Therefore, a false slide block structure is usually provided on the mold to solve this problem. The false slide block is called because the usual slide block needs to be inserted into the mold cavity to participate in the internal formation of the die casting. The end of the false slide block is located at the edge of the mold cavity, and does not extend into the mold cavity and does not participate in the formation of the internal structure of the die casting. Therefore, it is named false slide block. After the die casting is formed, the end of the false slide block will press on the edge of the die casting, thereby reducing the holding force of the mold on the die casting when the mold is opened, so that the die casting can more smoothly separate from the mold, thereby reducing the damage and deformation of the die casting. For example, the prior art "false slide block structure for automobile mold" (publication number CN205236788U) can press the edge of the part after the product is formed to avoid deformation and fracture of the product when it is taken out. However, the prior art still has the following technical problems:

[0004] 1. The structure of the existing parts is short and compact, so when the parts are ejected from the mold, the edge of the part is pressed by the false slide block to achieve good anti-damage and deformation effect. However, for die castings with large differences in weight and volume at both ends of the structure, the existing mold cannot guarantee the force balance of the die casting when it is ejected, which may cause one side of the die casting to be stuck in the mold, making it difficult for the die casting to be completely and smoothly demolded, which may cause serious damage, deformation, and other defects of the product.

[0005] 2. The false slide block in the prior art is pressed against the edge of the mold cavity. Due to the large pressure during die casting, the pressure of the molten metal when filling the mold cavity may cause the slide block to retreat, so that the false slide block does not have a pressing effect on the die casting after die casting, which may cause damage and deformation of the die casting after ejection. INVENTION CONTENTS

[0006] The utility model provides a die casting's opening mould ejection device, can solve prior art's structure in view of the structure both ends in weight and volume difference huge die casting, easy to cause die casting to be forced out when the stress imbalance, make structural member cannot be complete, smoothly demould, cause product serious injury, deformation and other defects problem.

[0007] The application provides the following technical scheme: a die casting opening mould ejection device, comprising a fixed mould, a movable mould located below the fixed mould, a false slide block system fixed on the movable mould and a reverse pushing system fixed on the fixed mould.

[0008] The reverse pushing system comprises a positioning plate, a guide column fixed below the positioning plate, a push plate slidingly connected on the guide column, a plurality of ejector rods fixed below the push plate and a compression spring sleeved on the guide column, the compression spring is located between the positioning plate and the push plate, and the ejector rods are located at one end of the larger cavity volume in the movable mould; the false slide block system comprises a cylinder assembly and a false slide block fixed on the driving end of the cylinder assembly, the front end of the false slide block extends to the edge of the smaller cavity volume in the movable mould, the tail end of the false slide block is provided with an inclined surface, the inclined surface is provided with a locking block, and the locking block is fixed on the fixed mould.

[0009] Advantages:

[0010] 1. Stably ejecting the die casting and preventing the die casting from being deformed and damaged. The compression spring in the reverse pushing system can exert the pushing force of ejection on the die casting through the ejector rods, and the plurality of ejector rods can exert the pushing force more uniformly on one end of the die casting and simultaneously act on different parts of the die casting, so that the die casting is more uniformly stressed during ejection, which is particularly important for some complex-shaped, large-sized and asymmetric structural die castings, and can effectively avoid the deformation or damage of the die casting caused by excessive local stress. Meanwhile, the ejector rods are located at one end of the larger cavity volume in the movable mould, and the front end of the false slide block extends to the edge of the smaller cavity volume in the movable mould. After the die casting is formed, the false slide block is pressed on the edge of the die casting, so that when the ejector rods push from the large-volume end of the die casting, the smaller end of the die casting will not be tightly clamped on the mould due to uneven stress, and the whole die casting is smoothly ejected from the mould, thereby preventing the structure on the die casting from being damaged or deformed and improving the quality of the die casting.

[0011] 2. The inclined surface and the locking block at the tail end of the false slide block provide stable support for the false slide block. Since the pressure of the molten metal during the die casting process may push the false slide block to retreat, causing the die casting to be deformed after being formed, the locking block and the inclined surface of the false slide block adopt the inclined locking mode, so that the vertical resistance force of the locking block can be distributed to the horizontal direction as much as possible through the inclined surface to resist the retreat trend of the false slide block, strengthen the resistance force and enhance the locking effect, thereby ensuring the stability of the false slide block and improving the ejection quality of the die casting.

[0012] Further, the false slide block is provided with an arc surface.

[0013] Beneficial effect: The shape of the die casting is relatively complex, and there are various irregular curves and contours on the edge. The arc surface can be designed and processed according to the specific shape of the die casting, better adapting to the edge of the die casting of different shapes, and ensuring the shape of the product after die casting.

[0014] Further, the false slide block is provided with a limiting protrusion, and the movable mold is provided with a groove, and the limiting protrusion can be inserted into the groove.

[0015] Beneficial effect: The limiting protrusion inserted into the groove can provide accurate positioning reference for the false slide block, ensure that the false slide block can accurately reach the preset position at each movement, and the cooperation accuracy with the movable mold is higher. At the same time, the limiting protrusion and the groove are tightly engaged to prevent the false slide block from being dislocated due to external force in the die casting work, so as to ensure the stability of the false slide block and the stability of the forming size accuracy and quality of the die casting.

[0016] Further, the oil cylinder assembly further comprises a sliding groove block fixed on the movable mold, a mounting block fixed on the sliding groove block, and an oil cylinder fixed on the mounting block. The piston rod end of the oil cylinder is fixedly connected with the tail of the false slide block, and the false slide block is slidingly connected on the sliding groove block.

[0017] Beneficial effect: The driving force generated by the oil cylinder can be directly and effectively transmitted to the false slide block, reducing the energy loss and deformation in the force transmission process. The false slide block can smoothly slide on the sliding groove block, reducing the deviation and shaking of the movement, ensuring the accuracy of the false slide block extending into the mold cavity, and further ensuring the demolding quality of the die casting.

[0018] Further, the oil cylinder is further fixed with a travel switch.

[0019] Beneficial effect: Since the position of the false slide block extending into the cavity will affect the quality of the die casting after forming and the effect when the die casting is pushed out by the back thrust system, the travel switch can accurately monitor the movement position of the piston rod of the oil cylinder, accurately control the stroke of the false slide block, and ensure that the position accuracy of each ejection is within a very small error range, so as to ensure the quality of the product after forming.

[0020] Further, two fixed blocks are further fixed above the oil cylinder, a sliding rod is slidingly connected between the fixed blocks, a sensing sleeve is fixed to the middle of the sliding rod, a connecting block is fixed to the end of the sliding rod, and the other end of the connecting block is fixedly connected with the piston rod of the oil cylinder. The sensing sleeve is used to contact the contact of the travel switch.

[0021] Beneficial effects: the slide rod is fixedly connected with the piston rod of the oil cylinder through the connecting block, so that the slide rod can move synchronously with the piston rod. The induction sleeve is fixed in the middle of the slide rod, when the piston rod moves, the slide rod drives the induction sleeve to move, so as to contact the contact of the travel switch, so as to ensure the accurate transmission of the travel signal, and then realize the accurate control of the stroke of the oil cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure axis measurement view of the utility model.

[0023] Figure 2 It is Figure 1 The axis measurement view of the false slide block system.

[0024] Figure 3 It is Figure 1 The axis measurement view of the reverse thrust system.

[0025] Figure 4 It is Figure 1 The axis measurement view of the pressure casting.

[0026] Figure 5 It is Figure 2 The enlarged view of the false slide block. DETAILED DESCRIPTION

[0027] The following is further explained in detail through specific embodiments:

[0028] The marks in the drawings of the specification include: positioning plate 1, compression spring 2, guide column 3, pressure casting 4, boss 401, movable die 5, false slide block 6, limiting protrusion 601, arc surface 602, inclined surface 603, locking block 7, travel switch 8, fixed block 81, slide rod 82, connecting block 83, induction sleeve 84, oil cylinder 9, mounting block 10, sliding groove block 11, jacking rod 12, push plate 13.

[0029] Example one

[0030] As Figures 1 to 5 shown, a mold opening and ejection device of a pressure casting 4, including a fixed mold, a movable die 5 located below the fixed mold, a false slide block system fixed on the movable die 5 and a reverse thrust system fixed on the fixed mold; for the convenience of display, the fixed mold has been omitted, as Figure 4 shown, this embodiment illustrates a pressure casting 4 with asymmetric structure and relatively long longitudinal length.

[0031] As Figure 1 and Figure 2As shown, the false slider system includes a cylinder 9 assembly and a false slider 6 fixed on the driving end of the cylinder 9 assembly, the cylinder 9 assembly further includes a sliding block 11 fixed on the movable die 5, a mounting block 10 fixed on the sliding block 11, and a cylinder 9 fixed on the mounting block 10, the piston rod end of the cylinder 9 is fixedly connected with the tail of the false slider 6, the sliding block 11 is provided with two blocks, the false slider 6 is slidingly connected between the sliding blocks 11, a travel switch 8 is further fixed above the cylinder 9, two fixed blocks 81 are further fixed on the front and rear ends of the cylinder 9, a sliding rod 82 is slidingly connected between the fixed blocks 81, a sensing sleeve 84 is fixed on the middle part of the sliding rod 82, a connecting block 83 is fixed on the end of the sliding rod 82, the other end of the connecting block 83 is fixedly connected with the piston rod of the cylinder 9, and the sensing sleeve 84 is used to contact the contact of the travel switch 8. The driving force generated by the cylinder 9 can directly drive the false slider 6 to stably slide on the sliding block 11, reducing the deviation and shaking of movement, ensuring the accuracy of the false slider 6 extending into the mold cavity, and further ensuring the demolding quality of the die casting 4. The travel switch 8 can accurately monitor the movement position of the piston rod of the cylinder 9, accurately control the stroke of the false slider 6, and ensure that the position accuracy of each ejection is within a very small error range, so as to ensure the quality of the product after forming.

[0032] As shown in Figure 2 and Figure 5 , the front end of the false slider 6 is provided with an arc surface 602. The shape of the die casting 4 is relatively complex, and there are various irregular curves and contours on the edge. The arc surface 602 can be designed and processed according to the specific shape of the die casting 4, better adapt to the edges of die castings 4 of different shapes, and ensure the shape of the product after die casting. The lower part of the front end of the false slider 6 is provided with a limiting protrusion 601, and the movable die 5 is provided with a groove. The limiting protrusion 601 can be inserted into the groove. The limiting protrusion 601 inserted into the groove can provide an accurate positioning reference for the false slider 6, ensure that the false slider 6 can accurately reach the preset position during each movement, and have higher cooperation accuracy with the movable die 5. At the same time, the limiting protrusion 401 tightly engages with the groove, prevents the false slider 6 from dislocation due to external force during die casting work, ensures the stability of the false slider 6, and ensures the forming size accuracy and quality stability of the die casting 4.

[0033] As shown in Figure 1 and Figure 5 , the front end of the false slider 6 extends to the edge of the smaller end of the cavity volume in the movable die 5, the tail end of the false slider 6 is provided with an inclined surface 603, the inclined surface 603 is provided with a locking block 7, the locking block 7 is fixed on the fixed die, and the locking block 7 is used to prevent the false slider 6 from dislocation.

[0034] As shown in Figure 1 and Figure 3As shown, the back -driving system includes a positioning plate 1, a guide column 3 fixed below the positioning plate 1, a push plate 13 slidingly connected on the guide column 3, a plurality of ejector pins 12 fixed below the push plate 13 and a compression spring 2 sleeved on the guide column 3, the compression spring 2 is located between the positioning plate 1 and the push plate 13, the ejector pins 12 are located at one end of the larger cavity volume in the movable mold 5, the bottom ends of the plurality of ejector pins 12 can abut against the boss 401 on the medium pressure casting 4, the positioning plate 1 is provided with a positioning hole, the positioning hole is used for being connected with a driving component (such as an oil cylinder 9) on the fixed mold, so as to drive the whole positioning plate 1 to move up and down. Figure 4 The positioning plate 1 is provided with a positioning hole, the positioning hole is used for being connected with a driving component (such as an oil cylinder 9) on the fixed mold, so as to drive the whole positioning plate 1 to move up and down.

[0035] The use method of the device is as follows:

[0036] Before die casting, the oil cylinder 9 drives the piston rod to be ejected, so that the end of the false slide block 6 extends to the edge of the cavity of the movable mold 5, the limiting protrusion 601 on the false slide block 6 is inserted into the groove of the fixed mold to realize limiting, then the movable mold 5 drives the whole oil cylinder 9 assembly to be close to the fixed mold on the upper side, until the inclined surface 603 on the false slide block 6 abuts against the locking block 7 on the fixed mold, after successful mold closing, the normal die casting process is started, after die casting, the positioning plate 1 is driven to move downward by the driving component, the bottom of the guide column 3 will contact the upper surface of the movable mold 5, indicating that it has been moved to the position, and the bottom of the ejector pin 12 will be pressed against the boss 401 on the medium pressure casting 4, at this time, the compression spring 2 is in a compressed state, then the movable mold 5 will move away from the fixed mold to open the mold, in this process, the elastic force of the compression spring 2 will drive the push plate 13 to move downward and make the plurality of ejector pins 12 push the medium pressure casting 4, so that the medium pressure casting 4 is separated from the cavity of the fixed mold, and when the ejector pin 12 pushes from the large volume end of the medium pressure casting 4, the false slide block 6 will press the other end of the medium pressure casting 4, so that the medium pressure casting 4 will not be tilted due to the uneven force on the large volume end and the small volume end, that is, the small volume end of the medium pressure casting 4 will not be clamped on the mold due to uneven force, so that the medium pressure casting 4 is smoothly pushed out of the fixed mold, to prevent the structure on the medium pressure casting 4 from being damaged or deformed, and to improve the quality of the medium pressure casting.

[0037] The above is only an embodiment of the utility model, the utility model is not limited to this embodiment, the common knowledge such as specific structure and characteristics in the scheme is not described too much herein.The skilled in the art should note that, without departing from the structure of the utility model, a number of modifications and improvements can be made, which should also be considered as the protection scope of the utility model, which will not affect the effect and practicality of the utility model.The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A mold opening and ejection apparatus for die castings comprising a stationary mold, a movable mold located below the stationary mold, a false slide system fixed to the movable mold, and a counter push system fixed to the stationary mold; characterized by: The reverse pushing system comprises a positioning plate, a guide column fixed below the positioning plate, a pushing plate slidingly connected to the guide column, a plurality of jacks fixed below the pushing plate, and a compression spring sleeved on the guide column, the compression spring being located between the positioning plate and the pushing plate, and the jacks being located at one end of the cavity in the movable mold with a larger volume. The false slide block system comprises an oil cylinder assembly and a false slide block fixed on the driving end of the oil cylinder assembly, the front end of the false slide block extending into the edge of the smaller end of the cavity in the movable mold, the tail end of the false slide block being provided with an inclined surface, the inclined surface being provided with a locking block, the locking block being fixed on the fixed mold, and the locking block being used for preventing the false slide block from retreating.

2. A device for opening and ejecting a die casting according to claim 1, characterized in that: An arc surface is arranged on the false slide block.

3. A mould opening and ejection apparatus for die castings as claimed in claim 2 wherein: A limiting protrusion is arranged on the false slide block, and a groove is arranged on the movable mold, the limiting protrusion being capable of being inserted into the groove.

4. A mould opening and ejection apparatus for die castings as claimed in claim 3 wherein: The oil cylinder assembly further comprises a sliding groove block fixed on the movable mold, a mounting block fixed on the sliding groove block, and an oil cylinder fixed on the mounting block, the piston rod end of the oil cylinder being fixedly connected to the tail of the false slide block, and the false slide block being slidingly connected to the sliding groove block.

5. A mould opening and ejection apparatus for die castings as claimed in claim 4 wherein: A travel switch is further fixed on the oil cylinder.

6. A mould opening and ejection apparatus for die castings as claimed in claim 5 wherein: Two fixing blocks are further fixed above the oil cylinder, a sliding rod being slidingly connected between the fixing blocks, a sensing sleeve being fixed on the middle part of the sliding rod, a connecting block being fixed on the end of the sliding rod, the other end of the connecting block being fixedly connected to the piston rod of the oil cylinder, and the sensing sleeve being used for contacting the contact of the travel switch.

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