JP2005315334A - Cold forging type manufacturing method of butterfly screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold forging type manufacturing method of a butterfly screw having favorable strength, hardly causing fracture of both blade parts, and hardly causing corrosion. <P>SOLUTION: In a first process, a circular wire rod material is fed into a rolling machine, and the rolling machine rolls the circular wire rod material into a circular wing material having both blades. In a second process, the wing material is cut to individual wing materials one by one by a cutting die and scissors. In a third process, both cut surfaces of the invididual wing material is retouched smooth to hold the circular part of the central part and oblong blades on both sides. In a fourth process, a recess is formed on both side surfaces of the central part of the individual wing material by pressing. In a fifth process, the bottom of the recess of the individual wing material is removed to form a through hole. In a sixth process, the blade parts on both sides of the individual wing material is bent upward and shaped like a butterfly to form the individual butterfly material. In a seventh process, a female screw is threaded in the through hole of the individual butterfly material. Thus, a butterfly screw is manufactured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a butterfly screw.

  The mutual screwing of the male screw and the female screw is an important method in the machine combination, and hexagonal or quadrangular ones are most commonly used for parts having screws, for example, nuts, depending on the use state and purpose. If specially strong screw alignment is not required, a butterfly screw that is convenient for removal is often selected. This is because the butterfly screw does not require a tool (for example, a wrench) in use, and can be manually clamped or removed. Since the butterfly screw is fairly connected after it is fastened, it is used in various everyday equipment such as battery electrodes, TV antennas, folding bicycles or skateboards. ing.

One type of conventional butterfly screw currently in use is a thin plate material shown in FIG. 9A formed by pressing. Since this wing nut is hollow, it has the following drawbacks.
1. Metal materials are thin and often break and fail during the threading process.

  2. Since the inside is hollow, when it is outdoors, it is blown by the wind or illuminated by sunlight, and is oxidized and rusted by the air. Therefore, when both wings are twisted, it becomes easy to tear, and attachment and removal become difficult.

3. Since it is molded by the press method, it is easy to make sharp hair-like thorns at the edges, which damages the fingers.
4). Since it is formed by the press method, a part of the metal material becomes waste, is wasted, and profits are reduced.

Next, there is another type of conventional butterfly screw as shown in FIG. 9B, which is formed by pouring molten material into a sand mold and is not hollow, but has the following drawbacks.
1. The surface is rough and not smooth, and the touch is poor.

2. After the mold is removed after molding, bumps are formed at the pouring opening of the mold, and the fingers are easily damaged.
3. Since the mold shrinks when the mold is cooled, a stress concentration phenomenon is likely to occur, and when both wings receive a relatively large external force, they tend to tear.

  In view of the shortcomings of the two types of butterfly screws according to the above-described conventional manufacturing method, there is provided a method for manufacturing a butterfly screw that has good strength and does not easily tear both wings and does not easily corrode, The object of the present invention is to minimize the number of rejected products, increase the production speed, and make the running water work smoothly and automatically.

  As a means provided by the present invention, as a first step of the manufacturing process, a coiled cylindrical wire is automatically formed into a linear shape that holds both blades with a rolling mill, and then sent to the cutting step of the second step. To do. The center of the winged material is a cylinder with a slightly larger diameter, and both sides are rectangular wings.

In the second cutting step, the winged wire is cut into individual winged materials with a cutting machine having a cutting die and a cam operated by a cam.
As a third step, the individual bladed material that has completed the second step is put into a shaping mold, and both rough and uneven flat cut surfaces are modified and flattened.

As a fourth step, the material with individual blades that has completed the third step is pressed to form a dent having two symmetrical openings on the opposite side surfaces of the circular portion at the central portion that is slightly larger than the bottom portion.
As a fifth step, the bottoms of the two dents of the individual winged material that have completed the fourth step are removed with a press to form a through hole.

Next, as a sixth step, the individual winged material that has completed the fifth step is pressed with a movable upper die and a fixed lower die, and the wings on both sides are curved upward to form a butterfly shape.
Next, if a female thread is cut in the central through hole of the individual butterfly material that has completed the seventh step, the entire process of the method for manufacturing the butterfly screw of the present invention is completed, and the individual butterfly material is a completed butterfly shape. Become a screw.
The method of manufacturing the butterfly screw of the present invention automatically forms a product from a long wire by running water without heating the material, so that the production speed is high, the waste is very small, and the product becomes a rejected product. Few.

  As shown in FIG. 1, the first embodiment of the method for producing a cold forged butterfly screw according to the present invention includes rolling in the first step, cutting in the second step, modification in the third step, and fourth. It consists of the process of forming the recess in the process, forming the through hole in the fifth process, forming the butterfly part in the sixth process, and forming the screw in the seventh process.

  In the first rolling process, a cylindrical wire material wound in a coil shape is automatically sent to a rolling mill by a conveyer, and a circular portion having a slightly larger cross-sectional diameter at the center portion of the material and a relative portion of the circular portion. It is formed into a wire with wings that forms two wings having a slightly rectangular cross section on both sides. Next, the winged wire is fed to the next second step.

  In the second step, the winged wire rod that has completed the first step is cut into individual winged materials one by one with a cutting machine having a cutting die and a scissor and a scissor operated by a cam. Next, the individual winged material is fed into the third step.

  In the modification of the third step, the individual winged material that has completed the second step is inserted into the modified mold, both rough and non-planar cut surfaces are modified and smoothed, and then the individual winged material is sandwiched 1 Thus, after rotating 180 degrees, it is sent to the fourth step.

  In the fourth step, the compression dent is formed by putting the individual winged material sandwiched between the sandwiching tools 1 that has completed the third step into a compression mold, and in the middle of the circular portion at the center of the individual winged material. The side surface and the lower side surface are compressed to form each one dent symmetrically, but this dent keeps the opening slightly larger than the bottom. Next, the material with the individual wings having the two dents is sandwiched by the sandwiching tool 2 and rotated by 180 degrees before being fed into the fifth step.

In the fifth step, the through hole is formed by removing the bottoms of the two dents of the individual winged material having two dents that have completed the fourth step, forming the through hole, Send in six steps.
In the sixth step, the butterfly portion is formed by placing the individual winged material having a through hole that has completed the fifth step between the movable upper die 5 and the fixed lower die 6 shown in FIG. Push down on the lower fixed lower mold 6 to bend the wings on both sides of the individual winged material upward to form a butterfly shape, and pull up the movable upper mold 5 again. The material is pinched by the pinching tool 4 and sent to the seventh step.

  The threading of the seventh step is the product of the butterfly screw that is completed by the manufacturing method of this embodiment if the individual butterfly material that has completed the sixth step is sent to the threading machine and the internal thread is cut in the central through hole. .

  Next, FIG. 6, FIG. 7 and FIG. 8 show a second embodiment of the manufacturing method of the present invention, between the modification of the third step of the first embodiment and the compression dent molding of the fourth step. Furthermore, the third step of fitting groove forming is increased. Therefore, the individual bladed material that has completed the third step is pinched by the pinch 1 and rotated 180 degrees, and then fed into the groove forming of the third step. In this step, a material with individual wings is put into the fitting groove mold, and the conical fitting groove is compressed on the side opposite to the recess whose opening is slightly larger than the bottom at one side of the central portion. Then, the material with the individual wings is sandwiched and rotated 180 degrees, and then fed into the compression dent formation in the fourth step. In the fourth step, the individual winged material that has completed the third step is placed in a compression mold, the conical groove is pressed to form a stepped groove, and the pinch (FIG. 8 shows). ), And further rotated 180 degrees before feeding to the fifth step. The fifth and subsequent steps are the same as those in the first embodiment described above.

  Next, in the second embodiment, the individual thumbscrew material that has completed the seventh step is further fed to the eighth step. Eighth step is a butterfly shape that prevents cold spots or can withstand high temperatures by fitting nylon pieces or metal pieces into a stepped groove (shown in Fig. 7) with a rivet desk in a rivet operation. It can be a screw.

  The method of manufacturing a cold forge-shaped butterfly screw of the present invention has fewer steps than the traditional method, is simple and has a high production speed, uses much material, has very little waste, and produces no products. There are various effects such as extremely low acceptance rate, good strength, anticorrosive property, smooth outer surface and convenient use.

It is a block diagram which shows the flow operation | work of the manufacturing method of the cold forge type butterfly screw by 1st Example of this invention. It is sectional drawing which shows the material of the manufacturing method of the cold forge type butterfly screw by 1st Example of this invention. It is a top view which shows the material of the manufacturing method of the cold forge type butterfly screw by 1st Example of this invention. It is a side view of the pinch tool used with the manufacturing method of the cold forge type butterfly screw by the first example of the present invention. It is a side view which shows the type | mold which presses and shape | molds the butterfly type | mold knob part used with the manufacturing method of the cold forge type butterfly screw by 1st Example of this invention. It is a block diagram which shows the flow operation | work of the manufacturing method of the cold forge type butterfly screw by 2nd Example of this invention. It is sectional drawing which shows the material of the manufacturing method of the cold forge type butterfly screw by 2nd Example of this invention. It is a side view which shows the pinching tool used for the manufacturing method of the cold forge type butterfly screw by 1st Example of this invention. It is a perspective view of the butterfly screw produced by the conventional manufacturing method. It is a perspective view of the other butterfly screw produced by the conventional manufacturing method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Clamp, 2 Clamp, 3 Clamp, 4 Clamp, 5 Movable upper mold, 6 Fixed lower mold, 21 Clamp

Claims (2)

A circular wire material wound in a coil shape is automatically fed to a rolling mill, and the rolling mill rolls the circular wire material into a circular winged material having a wing having a rectangular cross section,
A second step of cutting the winged material fed after completion of the first process into individual winged materials by a cutting die provided in a cutting machine and a scissor operated by a cam; ,
The individual winged material to be fed after completion of the second process is placed in a modified mold, and both rough and non-smooth cut surfaces of the individual winged material are smoothly modified to obtain a circular portion at the center. And a third process to hold the rectangular wings on both sides,
A fourth process in which a depression having a slightly larger opening than the bottom is formed by pressing on both side surfaces of the center part of the individual bladed material fed from the third process;
A fifth step of forming a through hole by removing a bottom of the dent of the individually bladed material that has completed the fourth step;
The material with individual wings fed after completion of the fifth process is placed between the movable upper die and the fixed lower die, and the upper die is moved downward to put the material with individual wings into the lower die. The sixth process of press-fitting the individual winged material into a butterfly shape by curving the wings on both sides upward to form an individual butterfly material;
A seventh process of cutting the female thread with a threading machine into the through hole in the center of the individual butterfly material fed in after completing the sixth process;
A method for producing a cold-forged butterfly screw, comprising: Provided between the third process and the fourth process, a depression having a slightly larger opening than the bottom is formed on the side surface of the circular part of the central part of the individual winged material by pressing, and the circular part of the central part Forming a conical groove on the other side surface, and further pressing the conical groove to form a stepped groove;
Receiving the butterfly screw that has completed the seventh process, and fitting a nylon piece or metal piece into the fitting groove to prevent low temperature or high temperature resistance against the butterfly screw. The eighth process of making a butterfly screw with
The method of manufacturing a cold forged butterfly screw according to claim 1, further comprising:

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