Secondary auxiliary core-pulling device arranged in core-pulling sliding block

Abstract

The utility model relates to a secondary auxiliary core-pulling device arranged in a core-pulling slide block, which comprises a forming bottom hole pin, a displacement hole is arranged in the core-pulling slide block, the shape of the displacement hole is matched with that of the front end of the forming bottom hole pin, the forming bottom hole pin penetrates through a movable die core and the displacement hole to be inserted into a forming part of a casting, and a material bottom hole is formed after die casting is completed. According to the secondary auxiliary core-pulling device arranged in the core-pulling slide block disclosed by the utility model, material bottom hole forming is carried out on a prepared machining hole part, the modeling thickness is reduced, and the formation of defects such as shrinkage cavities is eliminated, so that the product quality is ensured to meet the technical requirements.

Description

Technical Field

[0001] The utility model relates to the field of die casting, and particularly relates to a secondary auxiliary core-pulling device arranged inside a core-pulling slider. Background Art

[0002] The core-pulling system is an important part of a die-casting mold and a die-casting process. The reasonable application of the core-pulling device plays a crucial role in the forming and internal quality of die-castings. For the mold made for die-casting the casting, according to the demolding direction, the moving mold and the fixed mold are generally designed on the mold. After the aluminum liquid is injected, the moving mold and the fixed mold are separated, and the casting adheres to the moving mold side. Then, the ejection mechanism loads and ejects to take out the die-casting, and a die-casting production cycle is completed.

[0003] For some castings with special shapes, there are some special shapes on the moving mold side or the fixed mold side, and they cannot be smoothly demolded on the moving and fixed mold sides, so a core-pulling device must be designed. For example Figure 2 As shown, after the mold is opened after pouring, the slider core-pulling is first used to retract and retreat to make way for the demolding channel, so that the casting can be smoothly and stably demolded, and the casting is taken out smoothly to complete the die-casting operation.

[0004] For a certain product, as Figure 1 shown, the molding structure is relatively complex. Due to functional requirements, machining holes need to be set in the forming part of the core-pulling slider, and the hole position direction forms a 90° angle with the demolding direction of the core-pulling slider. After the machining is completed, since the formed wall thickness at this part is about 10*10*15, there are die-casting defects such as shrinkage holes inside, and there are voids and lack of meat on the machined surface, which cannot meet the quality requirements of the machined surface of the casting, that is, the bottom hole of the casting cannot be made normally. Also, since this part is in the deep cavity of the mold, using die-casting process means to solve the shrinkage hole phenomenon of the casting has little effect. Therefore, improving the shrinkage hole defect of the casting from the mold design is a technical problem that needs to be solved urgently. Summary of the Utility Model

[0005] To solve the technical problems existing in the prior art, the utility model provides a secondary auxiliary core-pulling device arranged inside a core-pulling slider, which forms a material bottom hole for the proposed machined hole part, reduces the molding wall thickness, and eliminates the formation of shrinkage holes and other defects.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A secondary auxiliary core-pulling device arranged inside a core-pulling slider includes a forming bottom hole pin. A displacement hole is provided inside the core-pulling slider, and the shape of the displacement hole is adapted to the front end of the forming bottom hole pin. The forming bottom hole pin passes through the moving mold core and the displacement hole and inserts into the forming part of the casting, and a material bottom hole is formed after die-casting is completed.

[0008] As a preferred technical solution, the secondary auxiliary core-pulling device further includes a small slider. A slideway is provided on the moving die core, and the small slider is slidably connected to the slideway. The forming bottom hole pin is fixedly installed at the front end of the small slider.

[0009] As a preferred technical solution, the forming bottom hole pin is divided into three sections: A, B, and C. Section C is the forming part with a demolding slope. The displacement hole matches the shape and size of sections A and B. The displacement hole is communicated with the slideway and the connection part is in a flared shape.

[0010] As a preferred technical solution, the secondary auxiliary core-pulling device further includes a front limit and a rear limit.

[0011] As a preferred technical solution, the core-pulling slider is connected to the core-pulling oil cylinder through a connecting rod, and the inclined pin arranged on the fixed die side is nestedly connected with the core-pulling device on the moving die side.

[0012] As a preferred technical solution, a wedging block is provided on the fixed die side.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The secondary auxiliary core-pulling device arranged inside the core-pulling slider of the present utility model forms the bottom hole of the material for the planned machined hole part, reduces the molding wall thickness, eliminates the formation of shrinkage holes and other defects, thereby ensuring that the product quality meets the technical requirements. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a casting product produced by the secondary auxiliary core-pulling device arranged inside the core-pulling slider of the present utility model;

[0016] Figure 2 It is a schematic diagram of the casting and the core-pulling slider of the present utility model;

[0017] Figure 3 It is an assembly drawing of the secondary auxiliary core-pulling device arranged inside the core-pulling slider of the present utility model;

[0018] Figure 4 It is a partial enlarged view of the secondary auxiliary core-pulling device arranged inside the core-pulling slider of the present utility model;

[0019] Figure 5 It is a schematic structural diagram of the forming bottom hole pin in the secondary auxiliary core-pulling device arranged inside the core-pulling slider of the present utility model.

[0020] In the figure: 1. casting; 2. core-pulling slider; 3. forming bottom hole pin; 4. small slider; 5. front limit; 6. rear limit; 7. wedging block; 8. moving die core; 9. inclined pin. Detailed Embodiments

[0021] The technical solution of the present utility model will be further described in conjunction with specific embodiments as follows:

[0022] As Figure 4 shown, a secondary auxiliary core-pulling device disposed inside the core-pulling slider 2 is characterized in that it includes a forming bottom hole pin 3. A displacement hole is provided in the core-pulling slider 2, and the shape of the displacement hole is adapted to the front end of the forming bottom hole pin 3. The forming bottom hole pin 3 passes through the moving die core 8 and the displacement hole and is inserted into the forming part of the casting 1. After die casting is completed, a material bottom hole is formed.

[0023] As Figure 3 shown, the secondary auxiliary core-pulling device further includes a small slider 4. A slideway is provided on the moving die core 8, and the small slider 4 is slidably connected to the slideway. The forming bottom hole pin 3 is fixedly installed at the front end of the small slider 4. The slideway can limit the moving direction of the small slider 4 and the forming bottom hole pin 3.

[0024] As Figure 5 shown, the forming bottom hole pin 3 is divided into three sections A, B, and C. Section C is the forming part with a demoulding taper. The shape and size of the displacement hole match those of sections A and B. The displacement hole is communicated with the slideway and the connection part is in a flared shape to guide the forming bottom hole pin 3 so that it can smoothly enter the displacement hole.

[0025] As Figure 3 shown, the secondary auxiliary core-pulling device further includes a front limit 5 and a rear limit 6. The front limit 5 is used to ensure the forming size requirements. The inclined pin 9 ensures that the forming bottom hole pin 3 can smoothly withdraw from the casting 1 body. The rear limit 6 ensures the preparatory position of the bottom hole pin 3 before the next die closing and die casting.

[0026] The core-pulling slider 2 is connected to the core-pulling oil cylinder through a connecting rod. The inclined pin 9 provided on the fixed die side is nestedly connected with the core-pulling device on the moving die side.

[0027] A wedge block 7 is provided on the fixed die side to prevent the core-pulling device from retreating during die casting.

[0028] During the use of the device, before the mold is closed, the core-pulling slider 2 is in a forward state through hydraulic power transmission and reaches the specified position of the mold. Then the mold is closed. At the same time, the small slider 4 is in a forward state through the inclined pin 9 to the specified position of the mold. After the small slider 4 is in place, the rear end slopes of the core-pulling slider 2 and the small slider 4 are locked by the wedge block 7 on the fixed die to prevent the front ends of the core-pulling slider 2 and the small slider 4 from retreating and generating displacement under the pressure of the aluminum liquid.

[0029] After pressure casting, the casting 1 cools and solidifies into a shape. When the mold is opened, due to the clamping force and the action of the slider, the casting 1 adheres to the moving die after opening. Due to the shape of the casting 1, the casting 1 cannot be directly ejected.

[0030] During the mold opening process, the small slider 4 built into the core-pulling slider 2 is displaced by the oblique pin 9, and the built-in small slider 4 retreats, causing the bottom hole pin embedded in the casting 1 to retreat, detach from the casting 1, and exit the core-pulling slider 2 to the inside of the movable mold core 8. After the small slider 4 is reset, the core-pulling slider 2 also starts to retreat. At this point, the small slider 4 and the core-pulling slider 2 have all retreated to their positions, and the channel that hinders the demolding of the casting 1 has been opened, and the ejection system can be started. After the casting 1 is ejected, a pouring cycle is completed.

[0031] Because casting 1 has a bottom hole, there is no shrinkage cavity in this part of the material after X-ray inspection, and there is no surface void or undercasting after surface machining. The product quality meets the technical requirements.

[0032] This embodiment is only a further explanation of the invention rather than a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of the claims of the invention, they are protected by the patent law.

Claims

1. A secondary auxiliary core pulling device arranged inside a core pulling slider, characterized in that: It includes a forming bottom hole pin, a displacement hole is arranged in the core pulling slider, the shape of the displacement hole is adapted to the front end of the forming bottom hole pin, the forming bottom hole pin passes through the movable mold core and the displacement hole and is inserted into the forming part of the casting, and the material bottom hole is formed after the die casting is completed.

2. The secondary auxiliary core pulling device arranged inside the core pulling slider according to claim 1 is characterized in that: It also includes a small slider, a slideway is provided on the movable mold core, the small slider is slidably connected to the slideway, and the forming bottom hole pin is fixedly installed on the front end of the small slider.

3. The secondary auxiliary core pulling device arranged inside the core pulling slider according to claim 2 is characterized in that: The formed bottom hole pin is divided into three sections, A, B and C. Section C is a formed part with a demoulding slope. The displacement hole matches the shape and size of sections A and B. The displacement hole is connected to the slideway and the connection is trumpet-shaped.

4. The secondary auxiliary core pulling device arranged inside the core pulling slider according to claim 1 is characterized in that: It also includes front limit and rear limit.

5. The secondary auxiliary core pulling device arranged inside the core pulling slider according to claim 1, characterized in that: The core-pulling slide block is connected to the core-pulling oil cylinder through a connecting rod, and the oblique pin arranged on the fixed mold side is nestedly connected to the core-pulling device on the movable mold side.

6. The secondary auxiliary core pulling device arranged inside the core pulling slider according to claim 5, characterized in that: The fixed mold side is provided with a wedge block.

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