A super long core-pulling stroke die-casting die structure

Abstract

The application discloses a super-long core-pulling stroke die-casting die structure, which comprises a fixed die plate, a movable die plate, a fixed die core, a movable die core, a left core, a right core, a slider wedge assembly, a right inclined pin and an oil cylinder core-pulling assembly; the slider wedge assembly is in abutment with the left core, and the oil cylinder core-pulling assembly is connected with the right core; the oil cylinder core-pulling assembly comprises a core-pulling oil cylinder and a core-pulling slider, one end of the core-pulling slider is connected with the core-pulling oil cylinder, the other end of the core-pulling slider is connected with the right core, and the core-pulling slider is provided with a core-pulling hole which is arranged to be inclined to the core-pulling direction; the lower end of the right inclined pin is inserted into the core-pulling hole, and the top surface of the right inclined pin is flush with the top surface of the fixed die plate. The application can solve the problems of insufficient core-pulling force and easy damage of the super-long core-pulling stroke die-casting die structure, and has a simple structure.

Description

Technical Field

[0001] This invention relates to the field of casting mold manufacturing technology, and in particular to a die-casting mold structure with an ultra-long core-pulling stroke. Background Technology

[0002] Core pulling is a common structure in die-casting molds, primarily used to solve the molding and demolding problems of products with release clips. Common core-pulling structures are mainly divided into two categories: mechanical core pulling and hydraulic cylinder core pulling. Mechanical core pulling utilizes the die-casting machine's opening force and stroke to drive transmission elements such as inclined pins, racks, and chains to act on moving elements and achieve the core-pulling action. It is commonly used for products with short core-pulling distances and relatively small core-pulling forces. Hydraulic cylinder core pulling uses a hydraulic cylinder as a transmission element to act on moving elements and achieve the core-pulling action. It is commonly used for products with long core-pulling distances and large clamping forces.

[0003] In actual die-casting production, products with ultra-long core-pulling strokes are frequently encountered. Ultra-long core-pulling is usually accompanied by extremely high clamping forces. The most common problems with these products are either insufficient pulling force to pull the core out, or excessive pulling force that damages the product or even breaks the core. Conventional solutions to these problems include increasing the size of the hydraulic cylinder, increasing the draft angle, and improving the hardness and smoothness of the core surface. However, these problems lead to reduced production efficiency and increased production costs. The root cause of these problems lies in the inherent characteristics of die-cast products and the working characteristics of the hydraulic cylinder: First, die-cast products are made of metal materials such as aluminum alloys, which have a higher clamping force than plastic products, reaching 12 MPa / mm²; second, alloys cool quickly, and the longer the mold dwell time, the greater the clamping force; third, the hydraulic cylinder's response speed is relatively slow, especially with large-diameter cylinders. This inherently increases the mold dwell time and thus the clamping force. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a die-casting mold structure with an ultra-long core-pulling stroke, which solves the problems of insufficient core-pulling force and easy damage of the core-pulling mold structure with an ultra-long core-pulling stroke, and the structure is simple.

[0005] To solve the above-mentioned technical problems, the present invention provides a die-casting mold structure with an ultra-long core-pulling stroke, including a fixed template, a moving template, a fixed mold core, a moving mold core, a left core, a right core, a slider wedge assembly, a right inclined pin, and a hydraulic cylinder core-pulling assembly;

[0006] A receiving cavity is provided between the fixed template and the moving template. The fixed mold core, the moving mold core, the left mold core, and the right mold core are disposed in the receiving cavity. A core cavity is provided between the fixed mold core and the moving mold core. The left mold core and the right mold core are disposed in the core cavity. The slider wedge assembly abuts against the left mold core, and the hydraulic cylinder core pulling assembly is connected to the right mold core.

[0007] The hydraulic cylinder core-pulling assembly includes a core-pulling cylinder and a core-pulling slider. One end of the core-pulling slider is connected to the core-pulling cylinder, and the other end of the core-pulling slider is connected to the right core. The core-pulling slider is provided with a core-pulling hole that is inclined in the core-pulling direction.

[0008] The lower end of the right inclined pin is inserted into the core-pulling hole, and the top surface of the right inclined pin is flush with the top surface of the fixed template.

[0009] As an improvement to the above technical solution, an internal ejector assembly is also included, which is disposed inside the right core.

[0010] The internal ejector assembly includes a drive component and an ejector pin component. The drive component abuts against the inner wall of the fixed mold core, and the top surface of the ejector pin component is flush with the outer wall surface of the right mold core. The drive component can drive the ejector pin component to move up and down.

[0011] As an improvement to the above technical solution, the driving component includes a driving rod, an ejecting elastic component, and a resetting elastic component, wherein the elastic force of the ejecting elastic component is greater than the elastic force of the resetting elastic component;

[0012] The ejector elastic element is used to eject the ejector pin, and the reset elastic element is used to reset the ejector pin.

[0013] As an improvement to the above technical solution, the right core is provided with a pin hole, a drive rod hole, an ejection mounting hole and a reset mounting hole respectively accommodating the ejector pin, the drive rod, the ejection elastic element and the reset elastic element;

[0014] The ejection mounting hole and the reset mounting hole are respectively located on both sides of the drive rod hole.

[0015] As an improvement to the above technical solution, the slider wedge assembly includes a wedge block, a locking slider, and an inclined guide post;

[0016] The wedge block is connected to the fixed template, and a sliding inclined surface is provided between the wedge block and the locking slider;

[0017] The locking slider has a locking hole along the direction away from the core pulling direction, and the inclined guide post is inserted into the locking hole.

[0018] As an improvement to the above technical solution, the moving template is provided with an inclined pin groove, the bottom surface of the inclined guide post abuts against the inclined pin groove, and the top surface of the inclined guide post is flush with the top surface of the fixed template.

[0019] As an improvement to the above technical solution, the cylinder core-pulling assembly also includes a connecting rod and a limit switch;

[0020] The two ends of the connecting rod are respectively connected to the core-pulling slider and the core-pulling cylinder.

[0021] As an improvement to the above technical solution, the moving template is provided with a wear-resistant plate, and the wear-resistant plate is provided with a guide groove.

[0022] The core-pulling slider moves along the guide groove.

[0023] As an improvement to the above technical solution, the moving template is also connected to a square iron and a base plate. The moving template, the square iron and the base plate are provided with an installation cavity on their inner sides, and an external ejector pin is provided in the installation cavity.

[0024] As an improvement to the above technical solution, the external ejector pin includes an ejector pin plate, an ejector pin fixing plate, an ejector pin, and an ejection drive component;

[0025] The ejector pin is connected to the ejector pin plate and the ejector pin fixing plate, and the ejector driving member drives the ejector pin to move.

[0026] Implementing this invention has the following beneficial effects:

[0027] This invention includes a right-angled pin and a hydraulic cylinder core-pulling assembly. The mold-opening force causes the right-angled pin to slide outward a certain distance, and the core-pulling slider moves in the core-pulling direction to loosen the core and eliminate most of the clamping force. After the mold opening is completed, the core-pulling cylinder drives the core-pulling slider to complete the remaining core-pulling action. By adopting a composite core-pulling method of right-angled pin mechanical core pulling and hydraulic cylinder core pulling, the core-pulling quality of ultra-long core-pulling strokes can be greatly improved.

[0028] The present invention also includes an internal ejector assembly, comprising a drive member and an ejector pin. Before mold opening, the top of the drive rod abuts against the fixed mold core, the ejector elastic member is under pressure, the reset elastic member is under pressure, and the top of the ejector pin abuts against the casting. At the moment of mold opening, the force between the fixed mold core and the right core disappears. Under the combined action of the ejector elastic member and the reset elastic member, the ejector pin is ejected, thereby further reducing the clamping force between the casting and the right core. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the die-casting mold structure involved in this invention;

[0030] Figure 2 This is a schematic diagram of the internal ejector assembly involved in the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0032] See Figure 1This invention provides a die-casting mold structure with an ultra-long core-pulling stroke, including a fixed template 1, a moving template 2, a fixed mold core 3, a moving mold core 4, a left core 5, a right core 6, a slider wedge assembly 7, a right inclined pin 8, and a hydraulic cylinder core-pulling assembly 9; a receiving cavity 11 is provided between the fixed template 1 and the moving template 2, and the fixed mold core 3, the moving mold core 4, the left core 5, and the right core 6 are disposed within the receiving cavity 11; a core cavity 31 is provided between the fixed mold core 3 and the moving mold core 4, and the left core 5 and the right core 6 are disposed within the core cavity 31; The slider wedge assembly 7 abuts against the left core 5, and the hydraulic cylinder core-pulling assembly 9 is connected to the right core 6. The hydraulic cylinder core-pulling assembly 9 includes a core-pulling cylinder 91 and a core-pulling slider 92. One end of the core-pulling slider 92 is connected to the core-pulling cylinder 91, and the other end of the core-pulling slider 92 is connected to the right core 6. The core-pulling slider 92 is provided with a core-pulling hole 921 that is inclined in the core-pulling direction. The lower end of the right inclined pin 8 is inserted into the core-pulling hole 921, and the top surface of the right inclined pin 8 is flush with the top surface of the fixed template 1.

[0033] When the mold is opened, the mold opening force causes the right oblique pin 8 to slide outward from the core-pulling hole 921 a certain distance, and the core-pulling slider 92 moves a small stroke (generally 1-5mm) in the core-pulling direction to loosen the right core 6 and eliminate most of the clamping force. After the mold is opened, the core-pulling cylinder 91 drives the core-pulling slider 92 to move and complete the remaining core-pulling action. Due to the use of the composite core-pulling method of the right oblique pin 8 and the cylinder core-pulling assembly 9, the core-pulling quality of ultra-long core-pulling stroke can be greatly improved.

[0034] See Figure 2 Due to the long core-pulling stroke, to further reduce the clamping force between the casting and the right core 6, this invention also includes an internal ejector assembly 10, which is located inside the right core 6. The internal ejector assembly 10 includes a driving member 101 and an ejector member 102. The driving member 101 abuts against the inner wall of the fixed mold core 3, and the top surface of the ejector member 102 is flush with the outer wall surface of the right core 6. The driving member 101 can drive the ejector member 102 to move up and down. The internal ejector assembly 10 works synchronously with the right inclined pin 8. When the mold is opened, the driving member 101 drives the ejector member 102 to move upward, applying an ejection force to the inner wall of the casting, thereby reducing the clamping force between the casting and the right core 6. After the mold is opened, the driving member 101 drives the ejector member 102 to move downward and reset, thereby preventing the ejector from scratching the inner wall of the casting during core pulling by the hydraulic cylinder.

[0035] As one embodiment of the driving component 101, the driving component 101 includes a driving rod 1011, an ejector elastic element 1012, and a reset elastic element 1013. The elastic force of the ejector elastic element 1012 is greater than that of the reset elastic element 1013. The ejector elastic element 1012 is used to eject the ejector pin, and the reset elastic element 1013 is used to reset the ejector pin 102. Before mold opening, the top of the driving rod 1011 abuts against the fixed mold core 3, the ejector elastic element 1012 is in a compressed state, the reset elastic element 1013 is in a compressed state, and the top of the ejector pin 102 abuts against the casting. At the moment of mold opening, the force between the fixed mold core 3 and the right core 6 disappears. Under the combined action of the ejector elastic element 1012 and the reset elastic element 1013, the ejector pin 102 is ejected, and the reset elastic element 1013 is in a compressed state. After the mold is opened, the drive rod 1011 is reset under the action of gravity and the elastic force of the reset elastic element 1013.

[0036] Correspondingly, the right core 6 is provided with an ejector hole 61, a drive rod hole 62, an ejection mounting hole 63, and a reset mounting hole 64, respectively accommodating the ejector pin 102, the drive rod 1011, the ejection elastic element 1012, and the reset elastic element 1013. The ejection elastic element 1012 and the reset elastic element 1013 are respectively disposed on both sides of the drive rod hole 62. The drive rod 1011 includes a horizontal connecting rod 1011a and a vertical mounting rod 1011b. The ejection elastic element 1012 and the reset elastic element 1013 are symmetrically sleeved on the vertical mounting rod 1011b and accommodated in the corresponding ejection mounting hole 63 and reset mounting hole 64. The horizontal connecting rod 1011a can move in the drive rod hole 62 along the ejection direction so that the ejector pin 102 can be ejected smoothly.

[0037] Furthermore, the ejector pin 102 includes multiple ejector pins arranged on the drive rod 1011. The multiple ejector pins are arranged in parallel, and the top surface of the multiple ejector pins is flush with the outer end face of the right core 6. The multiple ejector pins are ejected at the same time, which can improve the effect of eliminating the clamping force on the long shaft casting.

[0038] The slider wedge assembly 7 includes a wedge block 71, a locking slider 72, and an inclined guide post 73. The wedge block 71 is connected to the fixed template 1, and a sliding inclined surface 74 is provided between the wedge block 71 and the locking slider 72. The locking slider 72 has a locking hole 721 along the direction away from the core pulling direction, and the inclined guide post 73 is inserted into the locking hole 721. The locking slider 72 abuts against the left core 5. When the mold is opened, the inclined guide post 73 moves upward, causing the locking slider 72 to move to the left, thereby releasing the left core 5.

[0039] To facilitate locking the locking slider 72 to the left core 5, the moving template 2 is provided with an inclined pin groove 21. The bottom surface of the inclined guide post 73 abuts against the inclined pin groove 21, and the top surface of the inclined guide post 73 is flush with the top surface of the fixed template 1. In the die-casting state, the bottom surface of the inclined guide post 73 abuts against the inclined pin groove 21, thereby pressing the locking slider 72 into a predetermined position, providing sufficient support for the left core 5, and preventing the die-casting solution from pushing the left core 5 to move, causing casting quality problems.

[0040] The hydraulic cylinder core-pulling assembly 9 also includes a connecting rod 93 and a limit switch 94. The two ends of the connecting rod 93 are respectively connected to the core-pulling slider 92 and the core-pulling cylinder 91. The limit switch 94 includes a control switch 941 and a travel lever 942. One end of the travel lever 942 is connected to the connecting rod 93. When the core-pulling cylinder 91 moves, it drives the travel lever 942 to move. At the position corresponding to the control switch 941, the core-pulling cylinder 91 stops pushing out or pulling out the core.

[0041] To improve the service life of the mold and enhance the stability of the core-pulling slider 92 during movement, a wear-resistant plate 22 is provided on the moving plate 2, and a guide groove is provided on the wear-resistant plate 22. The core-pulling slider 92 moves along the guide groove.

[0042] Furthermore, in order to eject the casting from the moving mold core 4, the present invention also includes an external ejector pin 300. The moving mold plate 2 is also connected to a square iron 400 and a base plate 500. The moving mold plate 2, the square iron 400 and the base plate 500 are provided with an installation cavity 600 on their inner sides, and the external ejector pin 300 is disposed in the installation cavity.

[0043] The external ejector pin 300 includes an ejector pin plate 301, an ejector pin fixing plate 302, an ejector pin 303, and an ejection drive 304; the ejector pin 303 is connected to the ejector pin plate 301 and the ejector pin fixing plate 302, and the ejection drive 304 is an ejection spring, which is disposed between the ejector pin 303 and the ejector pin fixing plate 302; or the ejection drive 304 is an ejection cylinder, which is connected to the ejector pin fixing plate 302.

[0044] 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 die-casting mold structure with an ultra-long core-pulling stroke, characterized in that, Includes fixed template, moving template, fixed mold core, moving mold core, left core, right core, slider wedge assembly, right inclined pin and hydraulic cylinder core pulling assembly; A receiving cavity is provided between the fixed template and the moving template. The fixed mold core, the moving mold core, the left mold core, and the right mold core are disposed in the receiving cavity. A core cavity is provided between the fixed mold core and the moving mold core. The left mold core and the right mold core are disposed in the core cavity. The slider wedge assembly abuts against the left mold core, and the hydraulic cylinder core pulling assembly is connected to the right mold core. The hydraulic cylinder core-pulling assembly includes a core-pulling cylinder and a core-pulling slider. One end of the core-pulling slider is connected to the core-pulling cylinder, and the other end of the core-pulling slider is connected to the right core. The core-pulling slider is provided with a core-pulling hole that is inclined in the core-pulling direction. The lower end of the right inclined pin is inserted into the core-pulling hole, and the top surface of the right inclined pin is flush with the top surface of the fixed template. It also includes an internal ejector assembly, which is disposed inside the right core; The internal ejector assembly includes a drive component and an ejector pin component. The drive component abuts against the inner wall of the fixed mold core, and the top surface of the ejector pin component is flush with the outer wall surface of the right mold core. The drive component can drive the ejector pin component to move up and down. The drive component includes a drive rod, an ejection elastic component, and a return elastic component. The elastic force of the ejection elastic component is greater than the elastic force of the return elastic component. The ejector elastic element is used to eject the ejector pin, and the reset elastic element is used to reset the ejector pin; the right core is provided with ejector pin hole, drive rod hole, ejector mounting hole and reset mounting hole respectively accommodating the ejector pin, drive rod, ejector elastic element and reset elastic element; The ejection mounting hole and the reset mounting hole are respectively located on both sides of the drive rod hole; Before mold opening, the top of the drive rod abuts against the fixed mold core, the ejector elastic element is under pressure, the reset elastic element is under pressure, and the top of the ejector pin abuts against the casting. At the moment of mold opening, the force between the fixed mold core and the right core disappears. Under the combined action of the ejector elastic element and the reset elastic element, the ejector pin is ejected, and the reset elastic element is under pressure. After the mold is opened, the drive rod is reset under the action of gravity and the elastic force of the reset elastic element.

2. The die-casting mold structure with an ultra-long core-pulling stroke as described in claim 1, characterized in that, The slider wedge assembly includes a wedge block, a locking slider, and an inclined guide post; The wedge block is connected to the fixed template, and a sliding inclined surface is provided between the wedge block and the locking slider; The locking slider has a locking hole along the direction away from the core pulling direction, and the inclined guide post is inserted into the locking hole.

3. The die-casting mold structure with an ultra-long core-pulling stroke as described in claim 2, characterized in that, The moving template is provided with an inclined pin groove, the bottom surface of the inclined guide post abuts against the inclined pin groove, and the top surface of the inclined guide post is flush with the top surface of the fixed template.

4. The die-casting mold structure with an ultra-long core-pulling stroke as described in claim 1, characterized in that, The hydraulic cylinder core-pulling assembly also includes a connecting rod and a limit switch; The two ends of the connecting rod are respectively connected to the core-pulling slider and the core-pulling cylinder.

5. The die-casting mold structure with an ultra-long core-pulling stroke as described in claim 4, characterized in that, The moving template is provided with a wear-resistant plate, and the wear-resistant plate is provided with a guide groove; The core-pulling slider moves along the guide groove.

6. The die-casting mold structure with an ultra-long core-pulling stroke as described in claim 1, characterized in that, The moving template is also connected to a square iron and a base plate. The moving template, the square iron and the base plate are provided with an installation cavity on their inner sides, and an external ejector pin is provided in the installation cavity.

7. The die-casting mold structure with an ultra-long core-pulling stroke as described in claim 6, characterized in that, The external ejector pin assembly includes an ejector pin plate, an ejector pin fixing plate, an ejector pin, and an ejection drive assembly; The ejector pin is connected to the ejector pin plate and the ejector pin fixing plate, and the ejector driving member drives the ejector pin to move.

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