Exhaust positioning pin for casting

Abstract

A kind of exhaust positioning pin for casting, positioning pin is the structure of ladder, the top end of positioning pin is end forming part, the lower end of the end forming part is connected with first exhaust part and is fixed, first exhaust part and second exhaust part are connected with connecting rod and are fixed, the diameter of connecting rod is less than the diameter of first exhaust part and second exhaust part, the lower end of second exhaust part is connected with third exhaust part and is fixed, the diameter of third exhaust part is greater than the diameter of second exhaust part, the outer circumference of the first exhaust part and the second exhaust part is provided with multiple exhaust grooves in the axial direction, the upper end surface of third exhaust part is provided with multiple exhaust grooves in the radial direction, the exhaust groove of the upper end surface of third exhaust part and the exhaust groove on the outer circumference of second exhaust part are interconnected, the center of the positioning pin is provided with wire hole that is axially through the positioning pin, welding wire with smaller diameter than wire hole is arranged in wire hole, the upper end of welding wire is flush with the upper end surface of end forming part, the lower end of welding wire is welded with third exhaust part and is fixed.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, specifically to a venting positioning pin for casting. Background Technology

[0002] The casting process involves the replacement of gases in the mold cavity with the material of the part. Some molds also contain sand cores, which release gas during the metal filling process. Therefore, it is very easy for gases inside the mold cavity to not be completely expelled during metal filling, especially at the positioning datum points, where perforation of the datum can easily occur. This leads to insufficient venting. However, vent plugs cannot be placed at the positioning datum points for venting.

[0003] To avoid the problem of perforation of the positioning reference, the positioning pin needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a casting venting positioning pin. This solves the problems of difficulty in arranging vent plugs on the positioning pin and insufficient venting.

[0005] The purpose of this utility model is achieved by the following solution: a casting venting positioning pin, the positioning pin having a stepped structure, the positioning pin including an end forming part, a first venting part, a connecting rod, a second venting part, and a third venting part, the top of the positioning pin being the end forming part, the lower end of the end forming part being connected and fixed to the first venting part, the first venting part and the second venting part being connected and fixed to each other by the connecting rod, the diameter of the connecting rod being smaller than the diameter of the first venting part and the second venting part, the lower end of the second venting part being connected and fixed to the third venting part, the diameter of the third venting part being larger than the diameter of the second venting part, multiple venting grooves being axially arranged on the outer circumference of the first venting part and the second venting part, and multiple venting grooves being radially arranged on the upper end face of the third venting part, the venting grooves on the upper end face of the third venting part being interconnected with the venting grooves on the outer circumference of the second venting part, the center of the positioning pin having an axially penetrating wire hole, a welding wire with a diameter smaller than the wire hole being arranged in the wire hole, the upper end of the welding wire being flush with the upper end face of the end forming part, and the lower end of the welding wire being welded and fixed to the third venting part.

[0006] The exhaust grooves provided on the first exhaust section, the second exhaust section and the third exhaust section are polygonal exhaust grooves.

[0007] The horizontal cross-sectional shape of the connecting rod is either polygonal or circular.

[0008] The locating pin is a copper locating pin.

[0009] The advantages of this utility model are: 1. Compared with the traditional positioning pin, this venting positioning pin adds a venting groove and a wire-passing hole for venting, which significantly increases the venting function, solves the venting problem caused by the difficulty in designing a venting plug for the positioning pin, and improves product quality.

[0010] 2. The positioning pin is made of copper. When the molten aluminum comes into contact with the exhaust block, it will be rapidly cooled, its fluidity will decrease, and it will not easily flow into the exhaust groove on the positioning pin, thus solving the problem of easy blockage in traditional exhaust channels. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a cross-sectional view of the present invention;

[0013] Figure 3 This is a top view of the present invention. Detailed Implementation

[0014] like Figures 1 to 3 As shown, a casting venting positioning pin has a stepped structure. The positioning pin includes an end forming part 1, a first venting part 2, a connecting rod 3, a second venting part 4, and a third venting part 5. The top of the positioning pin is the end forming part 1, and the lower end of the end forming part 1 is connected and fixed to the first venting part 2. The first venting part 2 and the second venting part 4 are connected and fixed by the connecting rod 3. The diameter of the connecting rod 3 is smaller than the diameters of the first venting part 2 and the second venting part 4. The horizontal cross-sectional shape of the connecting rod 3 is polygonal or circular. This structure allows for more gaps on the side of the connecting rod 3, facilitating subsequent venting operations. The lower end of the second venting part 4 is connected and fixed to the third venting part 5. The diameter of the third venting part 5 is larger than the diameter of the second venting part 4. Multiple venting grooves are axially arranged on the outer circumference of the first venting part 2 and the second venting part 4. Multiple venting grooves are radially arranged on the upper end face of the third venting part 5. The venting grooves on the upper end face of the third venting part 5 are interconnected with the venting grooves on the outer circumference of the second venting part 4. The venting grooves on the first venting part 2, the second venting part 4, and the third venting part 5 are polygonal venting grooves. The positioning pin has an axially penetrating wire hole 6 at its center. A welding wire with a diameter smaller than the wire hole 6 is placed in the wire hole 6. The upper end of the welding wire is flush with the upper end face of the end forming part 1, and the lower end of the welding wire is welded and fixed to the third venting part 5 to prevent the welding wire from retracting or falling off. The gap between the welding wire and the wire hole 6 is used for venting. The positioning pin is a copper positioning pin.

[0015] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A venting positioning pin for casting, wherein the positioning pin has a stepped structure, characterized in that: The positioning pin includes an end forming part (1), a first venting part (2), a connecting rod (3), a second venting part (4), and a third venting part (5). The top of the positioning pin is the end forming part (1). The lower end of the end forming part (1) is connected and fixed to the first venting part (2). The first venting part (2) and the second venting part (4) are connected and fixed through the connecting rod (3). The diameter of the connecting rod (3) is smaller than the diameter of the first venting part (2) and the second venting part (4). The lower end of the second venting part (4) is connected and fixed to the third venting part (5). The diameter of the third venting part (5) is larger than the diameter of the first venting part (2) and the second venting part (4). The diameter of the second exhaust part (4) is such that the outer circumference of the first exhaust part (2) and the second exhaust part (4) is provided with multiple exhaust grooves in the axial direction, and the upper end face of the third exhaust part (5) is provided with multiple exhaust grooves in the radial direction. The exhaust grooves on the upper end face of the third exhaust part (5) are connected to the exhaust grooves on the outer circumference of the second exhaust part (4). The center of the positioning pin is provided with a wire-passing hole (6) that axially penetrates the positioning pin. A welding wire with a diameter smaller than the wire-passing hole (6) is provided in the wire-passing hole (6). The upper end of the welding wire is flush with the upper end face of the end forming part (1), and the lower end of the welding wire is welded and fixed to the third exhaust part (5).

2. The venting and positioning pin for casting according to claim 1, characterized in that: The exhaust grooves provided on the first exhaust section (2), the second exhaust section (4) and the third exhaust section (5) are polygonal exhaust grooves.

3. The venting and positioning pin for casting according to claim 1, characterized in that: The horizontal cross-sectional shape of the connecting rod (3) is either polygonal or circular.

4. The venting and positioning pin for casting according to claim 1, characterized in that: The locating pin is a copper locating pin.

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