Manufacturing method of screw semi-finished product

Abstract

A manufacturing method of a screw semi-finished product including: providing a billet; forging the billet into a quasi-polygonal semi-finished product, wherein the quasi-polygonal semi-finished product includes a quasi-polygonal head and a body, the quasi-polygonal head having a first top surface, a first bottom surface, multiple first flat side surfaces and multiple arc-shaped side surfaces, with the first top surface and the first bottom surface facing away from each other, and the first flat side surfaces and arc-shaped side surfaces connect the first top surface and the first bottom surface, wherein each arc-shaped side surface connects two adjacent first flat side surfaces, and the body is connected to the first bottom surface; and forging the quasi-polygonal head of the quasi-polygonal semi-finished product so that the arc-shaped side surfaces of the quasi-polygonal head form sharp edges, thereby forming a screw semi-finished product.

Description

Technical Field

[0001] This invention relates to screws, and more particularly to a method for manufacturing a semi-finished screw. Prior Technology

[0002] Generally, in the process of manufacturing polygonal screws such as hexagonal screws, the blank is first forged into a head and body of different diameters. Then, since the body supports the head, for convenience, the cylindrical head is usually cut directly into a hexagonal prism shape in one go.

[0003] However, the shearing process, in which the head changes from a cylindrical shape to a hexagonal prism, generates a significant amount of waste. Since screws are typically manufactured in very large quantities, the amount of waste generated from manufacturing each hexagonal screw can be substantial. Summary of the Invention

[0004] The present invention provides a method for manufacturing a semi-finished screw, which involves forging a polygonal head to make its arc-shaped side pointed, thereby enabling the semi-finished screw to be formed without waste.

[0005] A method for manufacturing a semi-finished screw disclosed in an embodiment of the present invention includes: providing a blank; forging the blank into a polygonal semi-finished product, the polygonal semi-finished product comprising a polygonal head and a body, the polygonal head having a first top surface, a first bottom surface, a plurality of first flat side surfaces and a plurality of arcuate side surfaces, the first top surface and the first bottom surface facing away from each other, the first flat side surfaces and the arcuate side surfaces connecting the first top surface and the first bottom surface, each arcuate side surface connecting two adjacent first flat side surfaces, the body being connected to the first bottom surface; and forging the polygonal head of the polygonal semi-finished product such that the arcuate side surfaces of the polygonal head are pointed, thereby forming a semi-finished screw.

[0006] According to the manufacturing method of the screw semi-finished product disclosed in the above embodiments, the blank is first forged into a polygonal semi-finished product, and then the polygonal head of the polygonal semi-finished product is forged, so that the arc-shaped side of the polygonal head is pointed, thus forming the screw semi-finished product. In other words, the blank is first forged into a polygonal semi-finished product with an shape similar to the screw semi-finished product, and then the polygonal semi-finished product is forged into the screw semi-finished product. In this way, compared with cutting the blank into screw semi-finished products in one go and generating waste, this two-stage forging method of the present invention does not generate any waste at all, which will save a considerable amount of waste when manufacturing screws in large quantities. Simple Explanation of the Diagram

[0007] Figures 1 to 8 schematically illustrate a method for manufacturing a screw semi-finished product according to an embodiment of the present invention. Implementation

[0008] The following detailed description of the embodiments of the present invention outlines its features and advantages. This description is sufficient to enable anyone skilled in the art to understand the technical content of the embodiments of the present invention and to implement them accordingly. Furthermore, based on the disclosure, patent claims, and drawings in this specification, anyone skilled in the art can easily understand the relevant objectives and advantages of the present invention. The following embodiments further illustrate the points of the present invention but are not intended to limit the scope of the invention in any way.

[0009] Hereinafter, a method for manufacturing a screw semi-finished product 10 according to an embodiment of the present invention will be described with reference to Figures 1 to 8. Figures 1 to 8 schematically present a method for manufacturing a screw semi-finished product 10 according to an embodiment of the present invention. The method for manufacturing the screw semi-finished product 10 may include the following steps.

[0010] Please refer to Figures 1 and 2 first. A blank 20 is provided. The blank 20 is, for example, cylindrical.

[0011] Next, please refer to Figures 2 to 6. The blank 20 is forged into a polygonal semi-finished product 40. In this embodiment, the step of forging the blank 20 into the polygonal semi-finished product 40 includes, for example, forging the blank 20 into a cylindrical semi-finished product 30 (as shown in Figures 3 and 4) and forging a cylindrical head 31 of the cylindrical semi-finished product 30 into a polygonal head 41 to form the polygonal semi-finished product 40 (as shown in Figures 5 and 6).

[0012] As shown in Figures 3 and 4, the cylindrical semi-finished product 30 includes a cylindrical head 31 and a body 200. The body 200 is, for example, cylindrical and connected to one end of the cylindrical head 31. The diameter D1 of the cylindrical head 31 is larger than the diameter D2 of the body 200.

[0013] As shown in Figures 5 and 6, the polygonal semi-finished product 40 includes a polygonal head 41 and a body 200. The polygonal head 41 is, for example, cylindrical and has a first top surface 411, a first bottom surface 412, a plurality of first flat side surfaces 413, and a plurality of curved side surfaces 414. The first top surface 411 and the first bottom surface 412 face away from each other. The first flat side surfaces 413 and the curved side surfaces 414 connect the first top surface 411 and the first bottom surface 412. Each curved side surface 414 connects to two adjacent first flat side surfaces 413. Furthermore, the curved side surfaces 414 are located at multiple corners of the first top surface 411 and multiple corners of the first bottom surface 412. The body 200 is connected to the first bottom surface 412.

[0014] Furthermore, the number of first flat sides 413 is, for example, an even number, such as six, to facilitate the rotation of the screws manufactured subsequently. In addition, the two first flat sides 413 facing away from each other are parallel to each other, and the distance S between the two parallel first flat sides 413 is greater than the diameter D2 of the body 200.

[0015] Next, as shown in Figures 6, 7, and 8, the polygonal head 41 of the forged polygonal semi-finished product 40 is made pointed so that the arcuate side surface 414 of the polygonal head 41 is pointed, thus forming a screw semi-finished product 10. The screw semi-finished product 10 includes a polygonal head 100 and a body 200. The polygonal head 100 has a second top surface 101, a second bottom surface 102, and a plurality of second flat side surfaces 103. The second top surface 101 and the second bottom surface 102 face away from each other. The second flat side surfaces 103 connect the second top surface 101 and the second bottom surface 102. These second flat side surfaces 103 are connected to each other to form a plurality of sharp corners C. The body 200 is connected to the second bottom surface 102. Furthermore, as shown in Figures 5 and 7, the number of first flat side surfaces 413 of the polygonal head 41 is equal to the number of second flat side surfaces 103 of the polygonal head 100. The polygonal head 100 is, for example, hexagonal prism-shaped.

[0016] At this point, the manufacturing of the screw semi-finished product 10 is complete. It should be noted that, although not shown, the screw semi-finished product 10 can be further processed into a screw, such as a hexagonal screw, through a thread rolling process.

[0017] According to the manufacturing method of the screw semi-finished product disclosed in the above embodiments, the blank is first forged into a polygonal semi-finished product, and then the polygonal head of the polygonal semi-finished product is forged, so that the arc-shaped side of the polygonal head is pointed, thus forming the screw semi-finished product. In other words, the blank is first forged into a polygonal semi-finished product with an shape similar to the screw semi-finished product, and then the polygonal semi-finished product is forged into the screw semi-finished product. In this way, compared with cutting the blank into screw semi-finished products in one go and generating waste, this two-stage forging method of the present invention does not generate any waste at all, which will save a considerable amount of waste when manufacturing screws in large quantities.

[0018] Specifically, manufacturing each semi-finished screw can save about 5% to 8% of waste material, which will result in a considerable amount of waste material saved after mass production of screws.

[0019] Although the present invention has been disclosed above with reference to the foregoing embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be determined by the scope of the patent application attached to this specification.

[0020] 10: Semi-finished screws 100: Polygonal Head 101: Second Top Surface 102: Second bottom surface 103: Second flat side 200: Body 20: Raw material 30: Cylindrical semi-finished product 31: Cylindrical head 40: Polygonal-like semi-finished products 41: Polygonal Head 411: First top surface 412: First base 413: First flat side 414: Curved side D1, D2: Diameter S: Distance C: Sharp corner

Claims

1. A method for manufacturing a screw semi-finished product, comprising: providing a blank; forging the blank into a polygonal semi-finished product, the polygonal semi-finished product comprising a polygonal head and a body, the polygonal head having a first top surface, a first bottom surface, a plurality of first flat side surfaces and a plurality of arcuate side surfaces, the first top surface and the first bottom surface facing away from each other, the first flat side surfaces and the arcuate side surfaces connecting the first top surface and the first bottom surface, each of the arcuate side surfaces connecting two adjacent first flat side surfaces, the body being connected to the first bottom surface; and forging the polygonal head of the polygonal semi-finished product such that the arcuate side surfaces of the polygonal head are pointed, thereby forming a screw semi-finished product.

2. A method for manufacturing a screw semi-finished product as described in claim 1, wherein the body is cylindrical.

3. A method for manufacturing a screw semi-finished product as claimed in claim 2, wherein the step of forging the blank into such a polygonal semi-finished product comprises: forging the blank into a cylindrical semi-finished product, the cylindrical semi-finished product comprising a cylindrical head and a body, the body being connected to one end of the cylindrical head, the diameter of the cylindrical head being larger than the diameter of the body; and forging the cylindrical head of the cylindrical semi-finished product into such a polygonal head to form such a polygonal semi-finished product.

4. A method for manufacturing a screw semi-finished product as described in claim 2, wherein the number of the first flat sides is even.

5. A method for manufacturing a screw semi-finished product as described in claim 4, wherein the number of the first flat sides is six.

6. A method for manufacturing a screw semi-finished product as described in claim 4, wherein two first flat sides facing away from each other are parallel to each other.

7. A method for manufacturing a screw semi-finished product as claimed in claim 6, wherein the distance between two parallel first flat sides is greater than the diameter of the body.

8. A method for manufacturing a screw semi-finished product as claimed in claim 1, wherein the screw semi-finished product comprises a polygonal head and a body, the polygonal head having a second top surface, a second bottom surface and a plurality of second flat side surfaces, the second top surface and the second bottom surface facing away from each other, the second flat side surfaces connecting the first top surface and the first bottom surface, the second flat side surfaces being connected to each other to form a plurality of sharp corners, and the body being connected to the second bottom surface.

9. A method for manufacturing a screw semi-finished product as claimed in claim 8, wherein the number of the first flat sides of the polygonal head is equal to the number of the second flat sides of the polygonal head.

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