Self-alignment positioning pin capable of being quickly inserted and pulled

Abstract

The utility model belongs to the metal plate die design technology, and particularly relates to a self-alignment positioning pin capable of being quickly inserted and pulled. A traditional positioning pin can be smoothly inserted only after positioning holes of a gland, a part unfolding material and a die body are completely aligned, and a pulling-out acting point does not exist. The self-alignment positioning pin capable of being quickly inserted and pulled comprises a cap head, a cap neck, a cap brim, a connecting section and a rod body from top to bottom, the cap neck is radially and inwards retracted to serve as a handheld area, the cap brim is of a partial conical structure, and the lower end of the rod body is hemispherical. The cap head is used as a force exerting part and can be pulled out by hands without a tool, and dismounting and pulling-out are easy and fast; the positioning pin is not pried by a tool in the plugging and unplugging process, so that the phenomenon of scrapping caused by deformation is avoided; in the inserting and pulling process of the positioning pins, part unfolding materials and a forming die are not damaged.

Description

Technical Field

[0001] This utility model belongs to sheet metal mold design technology, specifically involving a self-aligning positioning pin that can be quickly inserted and removed. Background Technology

[0002] Sheet metal parts are a major component of aircraft, accounting for over 60% of all structural parts. Approximately 70% of aerospace sheet metal parts are formed using rubber bladder hydroforming. Due to the diverse structures of sheet metal parts, each type requires a dedicated rubber forming mold. The rubber forming mold consists of a pressure cap and a mold body. To ensure the forming accuracy of the parts, the pressure cap, the unfolded part material, and the mold body are positioned using locating pins.

[0003] Traditional locating pins can only be inserted smoothly after the locating holes of the cap, the unfolded part, and the mold body are completely aligned. For large sheet metal parts, due to the weight of the cap, it is very difficult to align the three locating holes completely, which takes a long time. Or, inserting the locating pin when the three locating holes are not completely aligned may damage the unfolded part or the mold body.

[0004] Traditional locating pins have no pull-out force point and cannot be pulled out by hand. They need to be pried out with tools. After repeated use, the locating pins will deform or become unusable, or even damage the locating holes of the mold body, requiring the replacement of locating pins or the repair of the mold body. Summary of the Invention

[0005] This invention provides a quick-insertion and removable positioning pin, which is not only simple in structure and low in manufacturing cost, but also solves the problems of traditional positioning pins, such as difficulty in insertion and positioning, time consumption, need for tools for disassembly and removal, easy deformation and damage to forming mold.

[0006] This utility model relates to a quick-insertion self-aligning positioning pin, which includes, from top to bottom, a cap head, a cap neck, a cap brim, a connecting section, and a rod. The cap neck retracts radially inward to serve as a handheld area, the cap brim has a partially conical structure, and the lower end of the rod is hemispherical.

[0007] Advantageously, the connecting segment is larger than the pin hole, and the lower end face of the connecting segment is flush with the gland.

[0008] Advantageously, the cap head is cylindrical with rounded corners on the facade.

[0009] Advantageously, the diameter of the cap is 14 mm, the height is 3 mm, and the radius of the outer chamfer of the facade is 1.5 mm.

[0010] Advantageously, the neck of the cap is cylindrical with rounded inner corners on its facade.

[0011] Advantageously, the diameter of the cap neck is 11 mm, the height is 2 mm, and the radius of the inner rounded corner on the facade is 1 mm.

[0012] Advantageously, the upper surface of the brim is conical, the diameter of the brim is 20 mm, and the height is 2 mm.

[0013] Advantageously, the connecting segment is a cylinder with a diameter of 10 mm and a height of 1 mm.

[0014] Advantageously, the rod is a cylindrical rod or a stepped rod that passes sequentially through the pressure cap, the part unfolding material, and the mold body.

[0015] Advantageously, the self-aligning positioning pins are made of No. 45 steel and are heat-treated to HRC40-45.

[0016] Beneficial effects:

[0017] (i) The positioning pin has a simple structure and low processing and manufacturing cost;

[0018] (ii) When the positioning holes of the cap, the unfolded part and the mold body are not fully aligned, the hemispherical guide at the lower end of the rod can be used to make insertion easy and quick.

[0019] (iii) Using the cap head as the force point, it can be pulled out by hand without the aid of tools, making disassembly and extraction easy and quick;

[0020] (iv) The positioning pins are not pried by tools during the insertion and removal process, and will not be scrapped due to deformation.

[0021] (v) The positioning pins shall not damage the unfolded material and forming mold during the insertion and removal process. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a self-aligning positioning pin;

[0023] Figure 2 A schematic diagram illustrating the alignment principle of a self-aligning positioning pin;

[0024] Figure 3 A schematic diagram illustrating the manual removal of a self-aligning positioning pin.

[0025] Figure 4 and Figure 5 Two structural embodiments of self-aligning positioning pins.

[0026] 1-Cap head, 2-Cap neck, 3-Cap brim, 4-Connecting section, 5-Rock body, 6-Capping cap, 7-Part unfolded material, 8-Mold body Detailed Implementation

[0027] This utility model provides a quick-insertion and removable positioning pin, which consists of a cap head 1, a cap neck 2, a cap brim 3, a connecting section 4, and a rod body 5. Figure 1 As shown, its design is as follows:

[0028] The materials used should be inexpensive and easy to process. 45 steel is recommended, with quenching and heat treatment to HRC40-45.

[0029] The cap head 1 is cylindrical with rounded outer corners on its facade. Cap head 1 is the force-bearing part for manually inserting and removing the locating pin; its diameter and height should be designed for easy gripping by the fingers. Figure 3 As shown. The recommended cap diameter is 14mm, height is 3mm, and the radius of the outer chamfer on the facade is 1.5mm.

[0030] The neck 2 is cylindrical with rounded inner corners on its facade. Its upper end connects to the head 1, and its diameter is smaller than that of the head 1. The neck 2 provides sufficient space for manually inserting and removing the locating pin; its diameter and height are designed for easy gripping with the fingers, as shown in the attached figure. Figure 2 As shown. The recommended diameter of the cap neck is 11mm, the height is 2mm, and the radius of the inner rounded corners on the facade is 1mm.

[0031] The brim 3 is a cone with a beveled top surface that connects to the neck 2. Its diameter is larger than the diameter of the hat head. A brim diameter of 20mm and a height of 2mm are recommended, with a 1mm inward beveled top surface connecting to the neck.

[0032] Connecting section 4 is a cylinder, with its upper end connected to the brim 3 and its lower end connected to the rod 5. Its diameter is smaller than that of the brim. A diameter of 10mm and a height of 1mm are recommended for the connecting section.

[0033] Rod 5 is cylindrical, with a diameter smaller than that of the connecting section. Its lower end is hemispherical, used for guiding and positioning the cap 6, the unfolded part 7, and the mold body 8. The cap 6, the unfolded part 7, and the mold body 8 are connected and positioned by the rod. The guiding function of the lower hemispherical end allows for smooth insertion. Figure 2 As shown. The total height H of the rod is determined by the pressure cap 6, the unfolded part 7, and the mold body 8, ensuring stable positioning of the three. When the lower surface of the pressure cap 6 is a plane, the rod 5 is a straight rod, as shown. Figure 4 As shown; when the lower surface of the cap 6 is not planar, the rod 5 is a stepped rod, and the height of the upper section is not greater than the thickness of the cap, as shown. Figure 5 As shown. The recommended diameter of the straight bar is 5mm, and the radius of the lower hemispherical section is 2.5mm; the diameter of the upper section of the stepped bar is 7mm, and the height is 10mm; the total height of the bar is designed according to H=30+5n, where n is an integer.

Claims

1. A self-aligning positioning pin that can be quickly inserted and removed, characterized in that: It includes, from top to bottom, a hat head (1), a hat neck (2), a hat brim (3), a connecting section (4), and a rod (5), wherein the hat neck (2) is radially retracted inward to serve as a hand-held area, the hat brim (3) is a partially conical structure, and the lower end of the rod (5) is hemispherical.

2. The self-aligning positioning pin according to claim 1, characterized in that: The size of the connecting section (4) is larger than the size of the pin hole, and the lower end face of the connecting section (4) is close to the pressure cap (6).

3. The self-aligning positioning pin according to claim 2, characterized in that: The cap (1) is a cylinder with rounded corners on the front.

4. The self-aligning positioning pin according to claim 3, characterized in that: The cap (1) has a diameter of 14mm, a height of 3mm, and a radius of 1.5mm for the outer rounded corner of the facade.

5. The self-aligning positioning pin according to claim 1, characterized in that: The neck (2) of the cap is a cylinder with rounded inner corners on the facade.

6. The self-aligning positioning pin according to claim 5, characterized in that: The diameter of the cap neck (2) is 11mm, the height is 2mm, and the radius of the inner rounded corner on the facade is 1mm.

7. The self-aligning positioning pin according to claim 1, characterized in that: The upper surface of the brim (3) is a cone, the diameter of the brim (3) is 20mm, and the height is 2mm.

8. The self-aligning positioning pin according to claim 1, characterized in that: The connecting section (4) is a cylinder with a diameter of 10 mm and a height of 1 mm.

9. The self-aligning positioning pin according to claim 1, characterized in that: The rod (5) passes through the pressure cap (6), the part unfolding material (7), and the mold (8) in sequence.

10. The self-aligning positioning pin according to any one of claims 1-9, characterized in that: The self-aligning positioning pins are made of No. 45 steel and are heat-treated to HRC40-45.

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