A core box mold with pre-extraction function

Abstract

This utility model provides a core box mold with a pre-extraction function, including a lower core box and an upper core box corresponding to each other. The lower core box and the upper core box are respectively provided with a lower sand core surface and an upper sand core surface. A movable block mounting groove is formed on the lower sand core surface, and a movable block is provided in the movable block mounting groove. A pull rod is elastically and horizontally mounted on the movable block. The pull rod, driven by the upper core box, moves along its axial direction and creates a gap with the side wall of the movable block mounting groove. A sand cavity is formed between the lower sand core surface, the upper sand core surface, the movable block, and the pull rod. The advantage of this utility model is that the pull rod is pre-extracted by the upper core box, thus allowing for smooth removal of the pull rod without damaging the sand core.

Description

Technical Field

[0001] This utility model relates to the technical field of core box molds, and in particular to a core box mold with a pre-extraction function. Background Technology

[0002] Sand cores are the main components used in casting production to manufacture mold cores. They are generally made by mixing casting sand, molding sand binder, and additives in a certain proportion. In casting production, the hot core box is a common mold, and it is common to design a hand-operated movable block on the hot core box. The method of manually removing sand core holes using the movable block also exists. Because the sand core holes are formed in the shape of a round bar on the movable block, when manually removing the round bar after the sand core is made, pulling and rotating force is required, which can easily damage the sand core, resulting in a waste of labor and material costs. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a core box mold with a pre-extraction function.

[0004] This utility model provides a core box mold with a pre-extraction function, including a lower core box 1 and an upper core box 2 corresponding to each other. The lower core box 1 and the upper core box 2 are respectively provided with a lower sand core surface 1.1 and an upper sand core surface 2.1. A movable block mounting groove is opened at the lower sand core surface 1.1. A movable block 3 is provided at the movable block mounting groove. A pull rod 4 is elastically and horizontally mounted at the movable block 3. The pull rod 4, driven by the upper core box 1, is displaced along the axial direction of the pull rod 4 and a gap is generated with the side wall of the movable block mounting groove. A sand cavity is formed between the lower sand core surface 1.1, the upper sand core surface 2.1, the movable block 3, and the pull rod 4.

[0005] Furthermore, the lower core box 1 and the upper core box 2 are respectively provided with corresponding positioning grooves 1.2 and positioning protrusions 2.2 in the middle.

[0006] Furthermore, the movable block 3 has a movable groove inside, and the pull rod 4 is fitted with a spring 5 that connects the pull rod 4 and the movable groove.

[0007] Furthermore, the end face of the drawing rod 4 is provided with an inclined surface, and the upper core box 1 is provided with an inclined block 6. The inclined block 6 drives the drawing rod 4 to move along the axial direction of the shaft rod 4 through the inclined surface.

[0008] Furthermore, the gap between the pull rod 4 and the side wall of the movable block mounting groove is greater than or equal to 1 mm and less than or equal to 5 mm.

[0009] Furthermore, there are two lower sand core surfaces 1.1, and the pull rods 4 located on the two movable blocks 3 are respectively arranged longitudinally and laterally.

[0010] The advantages of this invention are as follows: the upper core box allows the pull rod to be pre-extracted, thus enabling its removal without damaging the sand core; the positioning groove and positioning protrusion provide accurate positioning references for the mold closing of the upper and lower core boxes; during the mold closing process, the vertically descending upper core box contacts and drives the pull rod to move to the bottom along its axial direction, the pull rod reaches the predetermined position and is elastically pressed, creating a gap between the pull rod and the side wall of the movable block mounting groove; when the mold opens, the upper core box separates from the pull rod, and under the elastic action, the pull rod moves in the opposite direction along its axial direction to reset, indicating that the pull rod has already loosened beforehand; the movable groove provides compression space for the spring, allowing the pull rod to move in the opposite direction to reset via the spring; the inclined block that descends vertically with the upper core box drives the pull rod to move along its axial direction via the inclined surface, and the inclined block that rises vertically with the upper core box separates from the pull rod, the pull rod moving in the opposite direction along its axial direction to reset under the spring force. Attached Figure Description

[0011] Figure 1 This is an exploded view of the present invention;

[0012] Figure 2 This is a bottom view of the upper core box and inclined block of this utility model;

[0013] Figure 3 This is the front view of the present invention;

[0014] Figure 4 for Figure 3 AA section view;

[0015] Figure 5 for Figure 4 Enlarged view of part B. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings.

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] See Figures 1 to 5This utility model provides a core box mold with a pre-extraction function, which includes a lower core box 1 and an upper core box 2 corresponding to each other. The lower core box 1 and the upper core box 2 are respectively provided with corresponding positioning grooves 1.2 and positioning protrusions 2.2 in the middle. The positioning grooves and positioning protrusions provide accurate positioning references for the mold closing of the upper and lower core boxes. The lower core box 1 and the upper core box 2 are respectively provided with a lower sand core surface 1.1 and an upper sand core surface 2.1, which are corresponding to each other. A movable block installation groove is opened at the lower sand core surface 1.1, and a movable block 3 is provided at the movable block installation groove. A pull rod 4 is elastically and horizontally mounted at the movable block 3. The pull rod 4 driven by the upper core box 1 moves along the axis of the pull rod 4 and creates a gap with the side wall of the movable block installation groove. A sand cavity is formed between the lower sand core surface 1.1, the upper sand core surface 2.1, the movable block 3, and the pull rod 4. Sand is injected into the sand cavity to solidify into a sand core. During operation, the movable block and the pull rod are combined and manually placed in the lower core box. Then, the upper and lower core boxes are closed. During the mold closing process, the vertically descending upper core box contacts and drives the pull rod to move to the bottom along its axial direction. The pull rod reaches the predetermined position and is elastically pressed, creating a gap between the pull rod and the side wall of the movable block mounting groove. After the sand core is cured after sand shooting, the upper core box is opened, and the upper core box separates from the pull rod. Under the action of elasticity, the pull rod moves in the opposite direction along its axial direction to reset. The pull rod has already loosened by 2mm beforehand, and the pull rod is separated from the sand core by a distance of 2mm, achieving pre-extraction of the pull rod. Without the sand core's clamping, the pull rod can be easily removed without damaging the sand core.

[0019] The movable block 3 has a movable groove, and the pull rod 4 is fitted with a spring 5 that connects the pull rod 4 and the movable groove. The movable groove is designed to allow space for the spring to compress, so that the pull rod can be moved in the opposite direction and reset by the spring.

[0020] See Figure 1 , Figure 5 The end face of the pull rod 4 is provided with an inclined surface, and the upper core box 1 is provided with an inclined block 6. The inclined block 6 drives the pull rod 4 to move along the axial direction of the shaft rod 4 through the inclined surface. During the mold closing process, the inclined block, which descends vertically with the upper core box, drives the pull rod to move to the bottom along the axial direction of the pull rod through the inclined surface. When the pull rod reaches the designed position, the spring is compressed. After the sand core is solidified after sand shooting, the inclined block, which rises vertically with the upper core box, separates from the pull rod. Under the action of the spring force, the pull rod moves back to its original position along the axial direction of the pull rod.

[0021] The gap between the pull rod 4 and the side wall of the movable block mounting groove is greater than or equal to 1 mm and less than or equal to 5 mm. Preferably, the gap between the pull rod and the side wall of the movable block mounting groove is 2 mm.

[0022] There are two lower sand core surfaces 1.1, and the pull rods 4 located on the two movable blocks 3 are set longitudinally and laterally, respectively.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A core box mold with a pre-drawing function, characterized in that: The device includes a lower core box and an upper core box, which are corresponding to each other. The lower core box and the upper core box are respectively provided with a lower sand core surface and an upper sand core surface. A movable block mounting groove is opened at the lower sand core surface. A movable block is provided at the movable block mounting groove. A pull rod is elastically and horizontally mounted at the movable block. The pull rod is driven by the upper core box to move along the axis of the pull rod and create a gap with the side wall of the movable block mounting groove. A sand cavity is formed between the lower sand core surface, the upper sand core surface, the movable block, and the pull rod.

2. A core box mold with pre-drawing function as described in claim 1, characterized in that: The lower core box and the upper core box are respectively provided with corresponding positioning grooves and positioning protrusions in the middle.

3. A core box mold with pre-drawing function as described in claim 1, characterized in that: The movable block has a movable groove inside, and the pull rod is fitted with a spring that connects the pull rod and the movable groove.

4. A core box mold with pre-drawing function as described in claim 1, characterized in that: The end face of the drawing rod is provided with an inclined surface, and the upper core box is provided with an inclined block. The inclined block drives the drawing rod to move along the axial direction of the drawing rod through the inclined surface.

5. A core box mold with pre-drawing function as described in claim 1, characterized in that: The gap between the pull rod and the side wall of the movable block mounting groove is greater than or equal to 1 mm and less than or equal to 5 mm.

6. A core box mold with pre-drawing function as described in claim 1, characterized in that: There are two lower sand core surfaces, and the pull rods located on the two movable blocks are respectively arranged longitudinally and laterally.

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