A die-casting mold core-pulling anti-reverse mechanism

Abstract

This utility model discloses a core-pulling anti-reverse mechanism for die-casting molds, including a core-pulling head, a core-pulling seat, a pressure bar, a positioning and fixing block, a hydraulic cylinder connecting rod, and a hydraulic cylinder. The core-pulling head is fixed to the core-pulling seat, and the core-pulling seat is fixed on both sides by pressure bars. The hydraulic cylinder is connected to the hydraulic cylinder connecting rod, which is mounted on the core-pulling seat. A positioning and fixing block is added to the rear side of the core-pulling seat and the front end of the hydraulic cylinder connecting rod, and the positioning and fixing block is fixed to the core-pulling seat by screws. Before the mold closes, the hydraulic cylinder pushes the hydraulic cylinder connecting rod forward, and the positioning and fixing block at the front end of the hydraulic cylinder connecting rod just fits into the groove of the pressure bar fixing position. The hydraulic cylinder connecting rod continues to advance forward, locking the positioning and fixing block that has entered the groove, thus locking the core-pulling seat and pressure bar together. After the mold opens, the hydraulic cylinder first releases pressure, and the positioning and fixing block exits the pressure bar groove under the action of the hydraulic cylinder's retraction, pulling out the core. This utility model prevents burrs and wall thickness defects caused by the core pulling mechanism reversing during the production process, improving the product qualification rate.

Description

Technical Field

[0001] This utility model relates to an anti-backward mechanism, specifically an anti-backward mechanism for core pulling in die-casting molds. Background Technology

[0002] Die casting is a method of obtaining a casting by loading metal into a mold cavity at high speed under high pressure and then shaping and solidifying it under pressure.

[0003] As some automobile manufacturers embark on a new chapter of integrated die casting, die-cast products have become increasingly complex and varied in structure in recent years. As we all know, the larger the casting, the greater the expansion force during the die casting process. While the moving and fixed molds can be kept in a closed state by increasing the tonnage of the die casting machine, the core-pulling seat still has to rely on traditional wedge blocks and hydraulic cylinders to prevent it from retracting. Some fixed molds can only use check valves and cannot be fitted with wedge blocks.

[0004] For molds with a capacity of 1600T or more, the phenomenon of core pulling and retraction of the fixed mold is prone to occur, resulting in burrs and increased wall thickness in the product, and an increase in the scrap rate.

[0005] Therefore, a new anti-backward mechanism is urgently needed to solve this problem. Utility Model Content

[0006] To address the problem of core pulling retraction during the production process, this utility model provides a core pulling anti-retraction mechanism for die-casting molds.

[0007] This utility model provides the following technical solution:

[0008] A die-casting mold core-pulling anti-reverse mechanism includes a core-pulling head, a core-pulling seat, a pressure bar, a positioning and fixing block, a hydraulic cylinder connecting rod, and a hydraulic cylinder. The core-pulling head is fixed to the core-pulling seat, and the core-pulling seat is fixed on both sides by pressure bars. The hydraulic cylinder is connected to the hydraulic cylinder connecting rod, which is installed on the core-pulling seat. A positioning and fixing block is added to the rear side of the core-pulling seat and the front end of the hydraulic cylinder connecting rod. The positioning and fixing block is fixed to the core-pulling seat by screws.

[0009] Furthermore, the inner wall of the pressure strip has a groove, and the positioning and fixing block at the front end of the hydraulic cylinder connecting rod is inserted into the groove of the pressure strip.

[0010] Furthermore, there are two positioning and fixing blocks, distributed on both sides of the front end of the hydraulic cylinder connecting rod, and the screws on the positioning and fixing blocks are plug screws.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention adds a positioning and fixing block to the rear side of the core-pulling seat and the front end of the hydraulic cylinder connecting rod, using the positioning and fixing block to lock the core-pulling seat and the pressure strip. This prevents the core-pulling from retracting during the production process, reduces burrs, ensures product wall thickness, and improves the product qualification rate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is an enlarged schematic diagram of the positioning and fixing block.

[0015] Figure 3 This is a diagram showing the relationship between the groove, the positioning and fixing block, and the pressure strip.

[0016] In the diagram: 1. Core puller head; 2. Core puller seat; 3. Pressure strip; 4. Positioning and fixing block; 5. Hydraulic cylinder connecting rod; 6. Hydraulic cylinder; 7. Screw; 8. Groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-3 This utility model discloses a die-casting mold core-pulling anti-reverse mechanism, including a core-pulling head 1, a core-pulling seat 2, a pressure strip 3, a positioning and fixing block 4, a hydraulic cylinder connecting rod 5, and a hydraulic cylinder 6. The core-pulling head 1 is fixed to the core-pulling seat 2, and the two sides of the core-pulling seat 2 are fixed by the pressure strip 3. The hydraulic cylinder 6 is connected to the hydraulic cylinder connecting rod 5, and the hydraulic cylinder connecting rod 5 is installed on the core-pulling seat 2. A positioning and fixing block 4 is added to the rear side of the core-pulling seat 2 and the front end of the hydraulic cylinder connecting rod 5. The positioning and fixing block 4 is fixed to the core-pulling seat 2 by screws 7.

[0019] The inner wall of the pressure strip 3 has a groove 8, and the positioning and fixing block 4 at the front end of the oil cylinder connecting rod 5 is inserted into the groove 8 of the pressure strip 3.

[0020] There are two positioning and fixing blocks 4, which are located on both sides of the front end of the hydraulic cylinder connecting rod 5. The screws 7 on the positioning and fixing blocks 4 are plug screws.

[0021] Fix the core puller head 1 to the core puller base 2, and fix both sides with pressure strips 3. Combine the hydraulic cylinder 6 and the hydraulic cylinder connecting rod 5 and install them into the core puller base 2. Finally, use the plug screw 7 to install the positioning and fixing block 4 on the rear side of the core puller base 2, at the front end of the hydraulic cylinder connecting rod 5.

[0022] Working principle:

[0023] Before the mold is closed, the hydraulic cylinder 6 pushes the hydraulic cylinder connecting rod 5 forward, and the core puller is pushed to the bottom. At this time, the positioning and fixing block 4 at the front end of the hydraulic cylinder connecting rod 5 is also inserted into the fixing position groove 8 of the pressure strip 3. The hydraulic cylinder connecting rod 5 continues to move forward and locks the positioning and fixing block 4 into the groove. The positioning and fixing block 4 is used to lock the core puller 2 and the pressure strip 3.

[0024] The entire core-pulling system is locked in both the forward and backward directions, preventing the core-pulling mechanism from retracting during subsequent mold closing and production. After mold opening, the hydraulic cylinder first releases pressure, and the hydraulic cylinder connecting rod 5 drives the core-pulling seat 2 to retract. Under the action of the hydraulic cylinder 6 retracting, the positioning and fixing block 4 exits the pressure strip groove, pulling out the core.

[0025] This invention prevents burrs and wall thickness defects caused by the retraction of cores during the production process of die-casting molds, thereby improving the product qualification rate.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A die casting mold core-pulling anti-retraction mechanism characterized by: The device includes a core-pulling head (1), a core-pulling seat (2), a pressure strip (3), a positioning and fixing block (4), a hydraulic cylinder connecting rod (5), and a hydraulic cylinder (6). The core-pulling head (1) is fixed to the core-pulling seat (2). The two sides of the core-pulling seat (2) are fixed by the pressure strip (3). The hydraulic cylinder (6) is connected to the hydraulic cylinder connecting rod (5). The hydraulic cylinder connecting rod (5) is installed on the core-pulling seat (2). A positioning and fixing block (4) is added to the rear side of the core-pulling seat (2) and the front end of the hydraulic cylinder connecting rod (5). The positioning and fixing block (4) is fixed to the core-pulling seat (2) by screws (7). The inner side wall of the pressure strip (3) has a groove (8). The positioning and fixing block (4) at the front end of the hydraulic cylinder connecting rod (5) is inserted into the groove (8) of the pressure strip (3).

2. A mechanism for preventing the backward movement of a core in a die casting mold according to claim 1, characterized in that: There are two positioning and fixing blocks (4), which are distributed on both sides of the front end of the cylinder connecting rod (5). The screws (7) on the positioning and fixing blocks (4) are selected as plug screws.

Images