Hex socket head bolts and manufacturing apparatus for hex socket head bolts

Abstract

The present invention provides a hexagon socket head cap screw and a manufacturing apparatus for hexagon socket head cap screws that can display various information such as screw length and specifications. [Solution] The hex socket head bolt 1 of the present invention is a hex socket head bolt having a hex socket 11 on the upper surface of a cylindrical head 10, and a flat surface 30 is formed on the side surface 12 of the head. The flat surface is formed by removing a portion of the side of the head, and furthermore, the flat surface is provided parallel to at least one side of the hexagon that constitutes the hexagonal hole when the head is viewed from above. Various information, such as the length of the screw, can be printed on the flat surface. Because it has a flat surface formed by removing a portion of the side of the head, various information such as the length of the screw can be printed on the flat surface even for hex socket head bolts with limited space on the top of the head.

Description

Technical Field

[0001] The present invention relates to a bolt with a hexagonal hole and a manufacturing apparatus for the bolt with a hexagonal hole, which can display various information such as the length and standard of the screw.

Background Art

[0002] In the bolt tightening operation, it is necessary to tighten a bolt with a size and standard determined at the design stage with a predetermined torque. However, generally, the size and standard are not marked on the bolt itself, so currently, workers find and use the required bolt based on experience. Therefore, for example, Patent Document 1 discloses a technique of engraving or attaching a seal of the standard of the bolt on the upper surface or side surface of the head of a hexagonal bolt.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the case of a bolt with a hexagonal hole, since a hexagonal hole is open on the upper surface of the cylindrical head, there is no space for engraving various information such as the length and standard of the screw, and also, since the side surface of the head is formed of a curved surface or is subjected to knurling, there is a problem that engraving etc. is difficult.

[0005] In consideration of the above problems, an object of the present invention is to provide a bolt with a hexagonal hole and a manufacturing apparatus for the bolt with a hexagonal hole, which can display various information such as the length and standard of the screw.

Means for Solving the Problems

[0006] The hexagon socket head bolt of the present invention is a hexagon socket head bolt having a hexagonal socket on the upper surface of a cylindrical head, wherein a flat surface is formed on the side surface of the head. The flat surface is formed by removing a portion of the side surface of the head, and furthermore, the flat surface is provided parallel to at least one side of the hexagon that constitutes the hexagonal hole when the head is viewed from the top side. A key feature is that various information, such as the length of a screw, can be printed on the flat surface. The manufacturing apparatus for hex socket head bolts of the present invention comprises a conveying unit that conveys a plurality of hex socket head bolts while holding them from above and below, a processing unit that forms the flat surface by removing a part of the side surface of the head, and a marking unit that prints various information on the flat surface by laser marking. The aforementioned transport unit is A hexagonal rod is fitted into the aforementioned hexagonal hole, and the screw Press down on the tip The characteristic feature is that it is transported in that state. [Effects of the Invention]

[0007] In this invention, the side of the head is removed to form a flat surface, so even with a hex socket head bolt where there is little space on the top surface of the head, various information such as the length of the screw can be printed on the flat surface. By providing a flat surface parallel to at least one side of the hexagon that forms the hexagonal socket when the head is viewed from above, the possibility of the head being damaged when tightening a socket head bolt with a hex wrench can be reduced. The manufacturing apparatus for hex socket head bolts of the present invention allows for the mass production of the above-mentioned hex socket head bolts. [Brief explanation of the drawing]

[0008] [Figure 1] Perspective view (a), front view (b), and top view (c) of a hexagon socket head bolt with a flat surface according to the present invention. [Figure 2] Plan views (a) and (b) showing modified examples of hex socket head bolts. [Figure 3] A schematic diagram showing a manufacturing apparatus for hex socket head bolts. [Figure 4] Figures (a) to (d) show the manufacturing process of socket head cap screws in the conveying section. [Figure 5] Diagram showing the manufacturing process of hex socket head bolts in the machining section. [Figure 6] Diagram showing the manufacturing process of hex socket head bolts in the marking area. [Modes for carrying out the invention]

[0009] An embodiment of the hex socket head bolt of the present invention will be described. As shown in Figures 1(a) to 1(c), the hex socket head bolt 1 consists of a head 10 and a thread 20. The head 10 is cylindrical and has a hexagonal hole 11 on its upper surface, and its side surface 12 is knurled. The head 10 does not necessarily have to be knurled. A key feature of the hexagon socket head bolt 1 of the present invention is that a flat surface 30 is formed on the side surface 12 of the head 10. As shown in Figure 1(c), the flat surface 30 must be formed in a position that does not extend to the hexagonal hole 11 when the head 10 is viewed from above, and that still ensures sufficient strength of the head 10.

[0010] The flat surface 30 is provided parallel to at least one side of the hexagon that constitutes the hexagonal hole 11 when the head 10 is viewed from above. If the flat surface 30 is not provided parallel to the sides that constitute the hexagon, as shown in Figure 2(a), the distance d from the corner of the hexagon to the flat surface 30 becomes too short, reducing the strength of the head 10, and there is a risk of damaging the head 10 when tightening the hexagonal socket head bolt 1 with a hex wrench. Note that two or more flat surfaces 30 may be formed on the head 10, as shown in Figure 2(b). Various information, such as the length L of the screw 20, can be written on the flat surface 30. For example, the specifications (M10, etc.), material, and type of screw 20 (coarse thread, fine thread) of the hex socket head bolt 1 may be written on the flat surface 30.

[0011] Next, an embodiment of the manufacturing apparatus for the hexagon socket head bolt 1 of the present invention (hereinafter sometimes simply referred to as "manufacturing apparatus") will be described. As schematically shown in Figure 3, the manufacturing apparatus 40 is generally composed of an input section 50, a conveying section 60, a processing section 70, a marking section 80, and a discharge section 90.

[0012] The input section 50 is a part where an ordinary hexagonal socket bolt before the flat surface 30 is formed is input. The conveying section 60 is a part that conveys a plurality of hexagonal socket bolts while holding them. Specifically, as shown in Fig. 4(a), a plurality of hexagonal bars 62 serving as jigs are arranged at equal intervals in a state of extending upward with respect to a lower base 61 extending in the front-rear direction. The orientation of the hexagonal bars 62 is adjusted in advance so that the flat surface 30 formed in a later process is parallel to at least one side of the hexagon constituting the hexagonal socket 11 of the head 10. That is, it is adjusted so that one of the six surfaces constituting the hexagonal bar 62 is in the orientation along the front-rear direction.

[0013] An upper base 63 is arranged above the lower base 61, and an elastic body 64 is arranged on the upper base 63 facing the hexagonal bar 62. The operator picks up the hexagonal socket bolt flowing from the input section 50 to the conveying section 60, and fits the hexagonal bar 62 into the hexagonal socket 11 of the head 10 as shown in Fig. 4(b). Note that a robot arm may be used instead of the operator. Next, as shown in Fig. 4(c), the upper base 63 descends and stops in a state where the elastic body 64 presses the tip of the screw 20 downward. In this way, the conveying section 60 conveys the plurality of hexagonal socket bolts to the downstream processing section 70 while holding them from above and below as shown in Fig. 4(d).

[0014] As shown in Fig. 5, in the processing section 70, a part of the side surface of the head 10 of the hexagonal socket bolt is removed to form the flat surface 30. The method of forming the flat surface 30 is not particularly limited, and for example, milling can be mentioned. Since the upper and lower parts of the hexagonal socket bolt 1 are held, it is possible to prevent the situation where the hexagonal socket bolt 1 comes out of the hexagonal bar 62 or rotates around the axis during processing. The bolt 1 with a hexagonal hole having a flat surface 30 moves to the downstream marking portion 80. A laser marker is disposed in the marking portion 80, and various information such as the length "20" of the screw 20 is printed on the flat surface 30 as shown in FIG. 6. By laser marking, it is possible to prevent the printed various information from deteriorating. The bolt 1 with a hexagonal hole after printing is discharged from the discharge portion 90. Thus, the production of the bolt 1 with a hexagonal hole having the flat surface 30 is completed. Since the operator can perform the tightening operation after checking the various information printed on the flat surface 30, the risk of bolt breakage due to using the wrong bolt can be reduced, and the accuracy of torque management can be improved.

Industrial Applicability

[0015] The present invention is a bolt with a hexagonal hole and a manufacturing apparatus for the bolt with a hexagonal hole that can display various information such as the length and standard of a screw, and has industrial applicability.

Explanation of Signs

[0016] 1 Bolt with a hexagonal hole 10 Head 11 Hexagonal hole 12 Side surface 20 Screw 30 Flat surface 40 Manufacturing apparatus 50 Input portion 60 Conveying portion 61 Lower base 62 Hexagonal bar 63 Upper base 64 Elastic body 70 Processing portion 80 Marking portion 90 Discharge portion

Claims

1. A socket head cap screw with a hexagonal socket on the top surface of a cylindrical head, A flat surface is formed on the side of the head, The flat surface is formed by removing a portion of the side surface of the head, and furthermore, the flat surface is provided parallel to at least one side of the hexagon that constitutes the hexagonal hole when the head is viewed from the top side. A hexagonal socket head bolt characterized in that various information such as the length of the screw can be printed on the flat surface.

2. In the manufacturing apparatus for hex socket head bolts according to claim 1, A conveying unit that transports multiple hex socket head bolts while holding them from above and below, A processing section that forms the flat surface by removing a part of the side surface of the head, The flat surface is equipped with a marking section for printing various information by laser marking. The conveying unit is characterized by fitting a hexagonal rod into the hexagonal socket and conveying the bolt while holding down the tip of the screw.

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