Core-pulling insert anti-retreating structure and die-casting die

Abstract

The utility model discloses an anti-retreat structure for a core-pulling insert, which belongs to the technical field of die-casting dies and comprises an anti-retreat oil cylinder positioned on a movable die sleeve plate, a retaining pin connected onto the anti-retreat oil cylinder and the core-pulling insert with a positioning groove, and the head of the retaining pin can be inserted into the positioning groove of the core-pulling insert under the driving of the anti-retreat oil cylinder. The movement direction of the retaining pin is perpendicular to that of the core-pulling insert, and the shape of the head of the retaining pin is matched with that of the positioning groove; a reinforcing plate is further arranged on the side, close to the movable mold, of the core pulling insert, the reinforcing plate is connected to the fixed mold core, and a through hole allowing the retaining pin to pass through is formed in the reinforcing plate. The locking device can be inserted into the core-pulling insert along with the head of the retaining pin to lock the core-pulling insert and limit the movement of the core-pulling insert, has a good locking effect, is small in error in the assembling and working processes, can completely lock the core-pulling, is not easy to reverse the core-pulling, ensures the qualified rate of the product size, and improves the production efficiency. And waste products are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of die-casting molds, specifically to a core-pulling insert anti-retraction structure and a die-casting mold. Background Technology

[0002] When die-casting parts with grooves using die-casting molds, a core puller is needed to form the groove structure together with the mold when it closes. After die-casting, the mold cannot be opened directly during demolding; the core puller must be removed first before the mold can be opened and the part taken out. To achieve demolding with the core puller, a locking device cannot be installed on the fixed mold core puller; the locking task can only be undertaken by a core puller cylinder. However, the pressure inside the cavity is high during die-casting, and the pressure in the core puller cylinder is affected by the pressurization of the die-casting machine, causing a brief pressure drop in the oil circuit. This can easily lead to the core puller retracting, which will result in product dimensions not meeting the requirements.

[0003] This phenomenon is more pronounced when die-casting small parts (0.1 mm level), causing the groove depth to fall short of requirements. Existing technologies often include a locking device connected to the back of the core puller, such as the core puller anti-backward mechanism in patent publication number CN118721622A. While this device provides a locking function, it has many components and inherent errors, preventing complete locking of the core puller. Slight backward movement of the core puller can still lead to dimensional defects and a high number of scraps. Utility Model Content

[0004] The present invention aims to provide a structure to prevent the core-pulling insert from retracting, in order to solve the problem that when casting precision parts, the locking device connected to the back of the core-pulling insert has many components, which cannot fully lock the core-pulling insert, resulting in slight retraction of the core-pulling insert, leading to unqualified product dimensions and a large number of scraps.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A core-pulling insert anti-retraction structure includes an anti-retraction cylinder located on a moving mold sleeve plate, a backstop pin connected to the anti-retraction cylinder, and a core-pulling insert with a positioning groove. The head of the backstop pin can be inserted into the positioning groove of the core-pulling insert under the action of the anti-retraction cylinder. The movement direction of the backstop pin is perpendicular to the movement direction of the core-pulling insert, and the shape of the head of the backstop pin is adapted to the positioning groove. A reinforcing plate is also provided on the side of the core-pulling insert near the moving mold. The reinforcing plate is connected to the fixed mold, and a through hole is provided on the reinforcing plate for the backstop pin to pass through.

[0007] This invention uses fewer components. The locking of the core is achieved by inserting a locking pin into the positioning groove of the core-pulling insert, and the locking strength is increased by a reinforcing plate with through holes.

[0008] The advantages of this solution are:

[0009] 1. This utility model has a good locking effect.

[0010] The head of the anti-reverse pin, driven by the anti-reverse cylinder, can be inserted into the positioning groove of the core-pulling insert. The movement direction of the anti-reverse pin is perpendicular to the movement direction of the core-pulling insert. A reinforcing plate with a through hole for the anti-reverse pin is also provided on the side of the core-pulling insert closest to the moving mold. As the head of the anti-reverse pin is inserted into the core-pulling insert, it locks the core-pulling insert, restricting its movement. The wall of the through hole on the reinforcing plate abuts against the anti-reverse pin, distributing the pressure on the core-pulling insert along its movement direction. This reduces the pressure of the anti-reverse pin on the positioning groove wall of the core-pulling insert, making the positioning groove less prone to deformation and damage, thus ensuring the anti-reverse function of the anti-reverse pin.

[0011] 2. The present invention has relatively small errors during assembly and operation.

[0012] The anti-retraction structure of this utility model uses fewer components, relying solely on anti-retraction pins and positioning grooves for locking without employing other redundant structures. This results in less assembly error. To prevent deformation and damage to the positioning groove, a reinforcing plate is designed to relieve pressure, further reducing errors during the locking process.

[0013] In summary, this structure can completely lock the core puller, making it less prone to slight backing back, thus ensuring a high pass rate for product dimensions and reducing the generation of scrap.

[0014] Furthermore, the head of the anti-reverse pin is divided into a protruding section that can extend into the positioning groove and a recessed section around which it does not contact the positioning groove. The height of the protruding section is greater than the depth of the positioning groove. The anti-reverse pin has sufficient lateral dimensions to ensure its strength. The recessed design around the protruding section avoids collision between the recessed section and the core-pulling insert, thereby affecting the service life of the anti-reverse pin and the core-pulling insert.

[0015] Furthermore, the anti-reverse pin is detachably connected to the piston rod of the anti-reverse cylinder via a clamp, facilitating the replacement of the worn anti-reverse pin.

[0016] Furthermore, the core-pulling cylinder is equipped with a one-way valve. During the core-pulling process, the one-way valve can ensure that the hydraulic oil does not flow back to the oil tank, thereby maintaining the pressure inside the cylinder and further ensuring the stability and reliability of the core-pulling action.

[0017] Furthermore, the core-pulling insert is divided into a rod and a head, with the rod and head connected by a threaded connection. A locating groove is located on the rod of the core-pulling insert. The rod has a larger cross-sectional area, resulting in a more uniform stress distribution, reducing stress concentration around the locating groove, and lowering the risk of fatigue cracks. The rod and head are connected by screws, facilitating the replacement of worn rods and heads.

[0018] Furthermore, the thickness of the reinforcing plate is greater than the depth of the positioning groove on the core-pulling insert, and the reinforcing plate is close to the side of the core-pulling insert. When locked, the reinforcing plate can withstand more pressure along the movement direction of the core-pulling insert.

[0019] Furthermore, to ensure the overall strength of the core-pulling insert, the depth of the positioning groove shall not exceed one-third of the diameter of the core-pulling insert rod.

[0020] Furthermore, the anti-reverse cylinder is bolted to the moving mold sleeve plate, which facilitates the disassembly of the anti-reverse cylinder or even the entire anti-reverse structure, increasing the flexibility of the mold.

[0021] This utility model also provides a die-casting mold, including the core-pulling insert anti-retraction structure as described above, which has all the advantages of the aforementioned core-pulling insert anti-retraction structure. Attached Figure Description

[0022] Figure 1 A schematic diagram of a die-casting mold with a core-pulling insert anti-retraction structure;

[0023] Figure 2 This is a schematic diagram of a core-pulling insert anti-retraction structure, including a locking pin and the core-pulling insert itself. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method:

[0025] The reference numerals in the accompanying drawings of the instruction manual include: moving mold 1, anti-reverse cylinder 2, anti-reverse pin 3, core-pulling insert 4, head 41, rod 42, positioning groove 5, slide block 6, reinforcing plate 7, through hole 8, core-pulling cylinder 9, groove 10, fixed mold 11, mold core 12.

[0026] Example 1

[0027] A core-pulling insert anti-retraction structure, such as Figure 1 As shown, it includes an anti-reverse cylinder 2, a backstop pin 3, a core-pulling insert 4, a slide block 6, a reinforcing plate 7, and a core-pulling cylinder 9.

[0028] The anti-reverse cylinder 2 is connected to the moving mold plate 1 of the die-casting mold. The anti-reverse pin 3 is detachably connected to the piston rod of the anti-reverse cylinder 2 using a clamp, facilitating the replacement of the worn anti-reverse pin 3. The anti-reverse pin 3 moves vertically under the action of the anti-reverse cylinder 2. The head 41 of the anti-reverse pin 3 is convex, consisting of a raised section and a recessed section. Figure 2As shown, the core-pulling insert 4 is connected to the slide block 6, which is connected to the core-pulling cylinder 9. The reinforcing plate 7 is connected to the mold core 12 of the fixed mold 11. The core-pulling insert 4 moves horizontally via the core-pulling cylinder 9. The core-pulling insert 4 consists of a rod 42 and a head 41, which are connected by hexagon socket head cap screws for easy replacement of worn rod 42 and head 41. A positioning groove 5 is provided on the upper side of the rod 42 of the core-pulling insert 4. The shape and width of the positioning groove 5 are adapted to the protruding section of the anti-reverse pin 3. To ensure the overall strength of the core-pulling insert 4, the depth of the positioning groove 5 is one-quarter of the diameter of the rod 42 of the core-pulling insert 4. The depth of the positioning groove 5 is less than the height of the protruding section to avoid collision between the recessed section and the core-pulling insert 4, thereby affecting the service life of the anti-reverse pin 3 and the core-pulling insert 4. The reinforcing plate 7 is positioned close to the top of the core-pulling insert 4, and has a through hole 8 for the anti-reverse pin 3 to pass through. The thickness of the reinforcing plate 7 is greater than the depth of the positioning groove 5 on the core-pulling insert 4, allowing the reinforcing plate 7 to withstand more pressure along the movement direction of the core-pulling insert 4 when locked. The core-pulling cylinder 9 is equipped with a check valve, which is connected in parallel circuit. The check valve oil circuit controls the oil inlet, and the solenoid valve controls the oil return. The check valve ensures that the hydraulic oil does not flow back to the oil tank, thereby maintaining the pressure inside the cylinder and further ensuring the stability and reliability of the core-pulling action.

[0029] When die-casting a workpiece with a groove 10 is required, and the workpiece size needs to be controlled within 0.1105-0.1205mm, this structure is effective. The working process of this embodiment is as follows:

[0030] When mold closing is required:

[0031] After mold closing, the one-way valve core-pulling cylinder 9 is activated first to push the core-pulling insert 4 to the predetermined position. Then, the anti-reverse cylinder 2 is controlled to push the anti-reverse pin 3 downward. The anti-reverse pin 3 passes through the through hole 8 of the reinforcing plate 7, and its head 41 protrudes into the bottom of the positioning groove 5 of the core-pulling insert 4, thus completing the locking. Under the action of the one-way valve core-pulling cylinder 9, the anti-reverse pin 3, and the reinforcing plate 7, the core pulling is not prone to backtracking, which can ensure the product dimensions.

[0032] When mold opening is required: the anti-retraction cylinder 2 pulls the anti-retraction pin 3 upward, and the anti-retraction pin 3 exits the positioning groove 5 of the core-pulling insert 4; the solenoid valve is activated to return oil, controlling the core-pulling cylinder 9 to pull the core back, and finally the mold is opened.

[0033] Example 2

[0034] A casting mold including the structure of Embodiment 1, wherein the anti-reverse cylinder 2 is bolted to the moving mold 1 plate of the die casting mold, which facilitates the disassembly of the anti-reverse cylinder 2, or even the entire anti-reverse structure, and increases the flexibility of the mold.

[0035] The casting mold operation process is as follows: First, the moving mold 1 and the fixed mold 11 of the casting mold are closed, including moving the core-pulling insert 4 to a predetermined position through the core-pulling cylinder 9. Then, the anti-retraction cylinder 2 is activated, which pushes the anti-retraction pin 3 downward. The anti-retraction pin 3 passes through the through hole 8 of the reinforcing plate 7 and extends the protruding section of its head 41 into the bottom of the positioning groove 5 of the core-pulling insert 4, thus completing the locking of the core. Then, under high pressure, liquid metal is poured into the casting cavity that matches the shape of the part. After the casting is formed, the anti-retraction cylinder 2 is activated again, which pulls the anti-retraction pin 3 upward, and the anti-retraction pin 3 exits the positioning groove 5 of the core-pulling insert 4. Next, the solenoid valve is activated to return oil and control the core-pulling cylinder 9 to retract the core. Finally, the moving mold 1 and the fixed mold 11 are separated.

[0036] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A core-pulling insert anti-retraction structure, characterized in that, It includes an anti-reverse cylinder located on the moving mold plate, a backstop pin connected to the anti-reverse cylinder, and a core-pulling insert with a positioning groove. The head of the backstop pin can be inserted into the positioning groove of the core-pulling insert under the action of the anti-reverse cylinder. The movement direction of the backstop pin is perpendicular to the movement direction of the core-pulling insert, and the shape of the head of the backstop pin is adapted to the positioning groove. A reinforcing plate is also provided on the side of the core-pulling insert near the moving mold. The reinforcing plate is connected to the fixed mold, and a through hole is opened on the reinforcing plate for the backstop pin to pass through.

2. The anti-retraction structure for the core-pulling insert according to claim 1, characterized in that: The head of the anti-reverse pin is divided into a protruding section that can extend into the positioning groove and a recessed section around it that does not contact the positioning groove. The height of the protruding section is greater than the depth of the positioning groove.

3. The anti-retraction structure for the core-pulling insert according to claim 1, characterized in that: The anti-reverse pin is detachably connected to the piston rod of the anti-reverse cylinder via a clamp.

4. The anti-retraction structure for the core-pulling insert according to claim 3, characterized in that: It also includes a core-pulling cylinder, which is equipped with a one-way valve.

5. The anti-retraction structure for the core-pulling insert according to claim 4, characterized in that: The core-pulling insert consists of a rod and a head, which are connected by screws. The positioning groove is located on the rod of the core-pulling insert.

6. The anti-retraction structure for the core-pulling insert according to claim 5, characterized in that: The thickness of the reinforcing plate is greater than the depth of the positioning groove on the core-pulling insert, and the reinforcing plate is close to the side of the core-pulling insert.

7. The anti-retraction structure for the core-pulling insert according to claim 6, characterized in that: The depth of the positioning groove shall not exceed one-third of the diameter of the core-pulling insert rod.

8. The anti-retraction structure for the core-pulling insert according to claim 1, characterized in that: The anti-reverse cylinder is bolted to the moving mold sleeve plate.

9. A die-casting mold, characterized in that: Includes the core-pulling insert anti-retraction structure as described in any one of claims 1 to 8.

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