JPH0377016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the field of manufacturing methods for cap nuts with washers.

[Prior Art] As a conventional method for manufacturing a cap nut with a washer, a cap nut previously formed by resistance welding or the like is placed on the lower side, a spherical part of the cap is supported by a nut holder, and a nut is protruded from the lower surface of the cap nut. There was a manufacturing process in which a separate washer was fitted to the annular protrusion and the annular protrusion was caulked so that the nut and washer could rotate freely at all times. One example of this is the invention disclosed in Japanese Patent Application Laid-open No. 1809/1983.

[Problems to be Solved by the Invention] The conventional manufacturing method for a cap nut with a washer (Japanese Patent Application Laid-Open No. 1809/1983) involves inserting the spherical part of the cap into the nut constituting the cap nut with the cap nut facing downward. The head of the nut was supported by a nut holder, and a washer was inserted into the annular protrusion protruding from the underside of the nut. It was pointed out that there were defects in the product, such as the inability to do so, and damage to the head of the nut during crimping, which significantly reduced the product value.

However, in the present invention, the spherical part of the cap constituting the cap nut is received by the die mounted above, and the stepped part protruding from the lower surface of the nut is received by the slider located below the die. When the entire cap nut is held and fixed between the die and the slider, the nut is always stabilized and the washer can be caulked accurately.

Furthermore, the present invention provides a method for manufacturing a cap nut with a washer, which has excellent advantages such as being able to swage the washer while the cap nut is securely fixed as described above, making automation even easier. It is intended for this purpose.

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the method for manufacturing a cap nut with a washer of the present invention, a hemispherical recess into which a cap constituting the cap nut can be fitted, and a nut constituting the cap nut are provided. A die having an opening-shaped recess into which the die can be fitted, and a slide holder located below the die and fixed to the die plate. A slider is provided with a through hole into which a punch is inserted, a washer is inserted into a stepped portion protruding from the lower surface of the nut, and a cap nut is placed on the upper surface of the slider, with the stepped portion of the nut facing downward; The nut is placed coaxially with the through hole of the slider, the spherical part of the cap is received in the hemispherical recess of the die, the nut is fitted into the other open recess, and the stepped part protruding from the lower surface of the nut is connected to the stepped part. The cap nut is held and fixed between the die and the slider by constantly supporting the washer inserted in the cap nut by a slider that slides vertically, and then the die is lowered and the cap nut is pressed by the die. The slider descends, and the fixed head of the punch, which is inserted into the through hole of the slider, slightly fits into the through hole of the cap nut, and at the same time pushes the stepped part outward, allowing the washer to rotate freely relative to the cap nut. This is a method for manufacturing a cap nut with a washer, characterized in that the cap nut is swaged so that the cap nut has a washer.

[Operation] The cap of the cap nut constructed as described above is fitted into the hemispherical recess of the die, and the nut is fitted into the open recess. Furthermore, on the top of the slider located below the die,
Place part of the step on the bottom of the nut into which the washer is inserted. In this case, a punch with a curved head whose diameter is slightly larger than the diameter of the through hole provided inside the nut is located below a portion of the through hole and the stepped portion of the nut. The cushion material attached to the lower surface of the die outside the open recess formed in the die presses the upper surface of the washer fitted into the step. Further, the slider is supported by a spring fitted into the slide holder.

Further, the punch and slide holder are fixed by a die plate.

When the die is lowered downward by a predetermined distance through the shank with respect to the cap nut set as above, the cap nut and washer will descend downward in proportion, and the head of the fixed punch will move downward from the nut. It fits slightly into the through hole, and at the same time presses the stepped part outward to swage the washer.

As mentioned above, while the die is descending, it is holding down the upper surface of the washer resting on the upper surface of the cushion material or slider.

After the above process, the shank and die are raised upward to a predetermined height to take out the washered cap nut product.

As described above, in the present invention, the cap nut is placed upward, and a part of the stepped portion of the bottom surface of the nut can be placed on the top surface of the slider, so that the cap nut can be placed securely, and The head of the nut is not damaged when the die descends.

[Example] Examples will be explained with reference to the drawings.1
1 is a nut constituting a washered cap nut a, and a through hole 5 in which a screw 4 passing through from the upper surface portion 2 to the lower surface portion 3 is carved is formed in the center portion of the nut 1. Reference numeral 6 denotes a stepped portion with a through hole 7 extending uniformly in height from the lower surface portion 3 constituting the nut 1. Then, the inside of the stepped portion 6 is formed into a slightly open shape. Furthermore, a hemispherical cap 8 is welded to the upper surface 2 of the nut 1 by resistance welding or the like. Reference numeral 9 denotes a washer which is fitted into the stepped portion 6 and has a through hole 10 formed in the center thereof, and this washer 9 is fitted into the stepped portion 6 of the nut 1 through the through hole 10.

b is a die and consists of the following configuration. That is, 11 is a shank attached to the upper part of the die b, and 12 is an opening-like recess into which the nut 1 constituting the cap nut a is fitted, which is formed inside the lower surface 13 of the die b. A hemispherical recess 14 into which the cap 8 fits is formed above the recess 12. Also, the lower surface 1 of the die b
3, a cushion material 16 having a through hole 15 with the same diameter as the open recess 12 is bonded to the inside thereof.
Dice b is configured with the above.

C is a slider located and attached below the die b, and has the following configuration. A vertical through hole 18, which is slightly larger in diameter than the through hole 7 of the nut 1, is formed in the center of the horizontal upper surface part 17. Further, a flange 19 that projects outward is formed at the lower part of the slider c.

d is a slide holder having an inner hollow part 20 and a hook part 21 extending upward and slightly inward, and the slider c is the slide holder d.
The flange 19 and the hook 21 are inserted into the empty chamber 20 and hooked onto the collar 19 and the hook 21. After fitting the spring 22 into the empty chamber 20, the slide holder d is fixed to the die plate 23. 24 is a punch having a curved head 25 fixed to the die plate 23 and fitted into the through hole 18 of the slider c.

Next, using the apparatus for manufacturing a cap nut with a washer constructed as described above, the cap nut a of the present invention is manufactured in the following manner.

The cap nut a with the stepped portion 6 fitted into the through hole 10 of the washer 9 is placed on the upper surface portion 17 of the slider c with the stepped portion 6 facing downward. Then, the cap 8 and the nut 1 are fitted into both the recesses 12 and 14 of the die b. As a result, most of the stepped portion 6 of the cap nut a before crimping is the slider c.
The washer 9 is placed stably on the upper surface 17 of the slider c.
7. Place it securely. Further, the upper surface of the washer 9 is also lightly pressed by a cushion material 16 made of rubber material or the like. At the same time, the surface portion of the cap 8 will surely fit into the recess 12 and will not swing. Furthermore, the entire nut 1 is reliably fitted into the recess 14, so that the outer surface of the nut 1 is not damaged or oscillated.

As described above, when the shank 11 is driven and the die b is lowered by a predetermined distance with respect to the cap nut a which is in the inserted and placed state, the slider c which is lifted upward by the spring 22 etc. , it descends slightly while resisting the descending die b. A punch 24 is attached to the lower inner side of the stepped portion 6 that protrudes from the cap nut a that has been lowered by a predetermined distance.
The head portion 25 of the washer 9 is fitted, and the stepped portion 6 is expanded outwardly, thereby caulking the washer 9. As a result, the caulked washer 9 is rotatable between it and the nut 1. After the nut 1 and washer 9 are caulked through the above steps, the shank 11
When the die b is lifted up, the die b is also lifted in proportion, and the cap nut a with the washer 9 fitted in both the recesses 12 and 14 can be taken out.

As described above, in the case of the present invention, the cap nut a before crimping can be reliably and stably placed between the die b and the slider c, and the outer part of the nut 1 can be prevented from being damaged. Nothing happened at all.

Figure 6 shows a conventional cap nut with washer.
FIG. 3 is a longitudinal cross-sectional view showing the state of a' during manufacture. With the cap 8' welded to the upper surface 2' of the nut 1' facing downward, the cap 8' is inserted into the recess 26 formed in the nut holder 25, and the upper surface of the nut 1', which is outside the cap 8' in a small area, is inserted. 2' is the nut holder 25
It is supported by the upper surface part 27 of. Therefore, in order to ensure the support surface of the upper surface part 2' of the nut 1',
A surrounding wall 28 is interposed between the upper surface 2' of the nut 1' and the nut holder 25. As described above, after the nut 1' with the cap 8' is turned upside down, which is the opposite of the present invention, a washer 9' is attached to the annular protrusion 6' that projects from the lower surface 3' of the nut 1'. mated,
Use the punch 29 from above to spread out the protrusion 6' and caulk the washer 9'. The above steps are the conventional manufacturing method for a cap nut with a washer.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

A cap is fitted into the hemispherical recess that constitutes the die, and a nut is fitted into the open recess, and the stepped part of the nut into which the washer is fitted is positioned below the die and is constantly pressed upward. The head of the punch, which is placed on the upper surface of the slider having a through hole and is fitted and fixed into the through hole of the slider, fits into the stepped part on which it is placed as the die descends, and the head of the punch is inserted into the through hole of the slider and fixed. Since the washered cap nut is manufactured by expanding the washer outward and caulking the washer, the cap nut is always held in a stable state from insertion to caulking, allowing for accurate caulking of the washered cap nut. It has the advantage of being able to

Furthermore, the present invention has the advantage that automation is further facilitated because the washer can be caulked with the cap nut securely fixed as described above.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway longitudinal sectional view showing the state before the cap nut is fitted and the washer is crimped in the manufacturing method of the cap nut with washer according to the present invention, Fig. 2 is a half-cut longitudinal sectional view of the same cap nut, and Fig. 3 is the same. FIG. 4 is a plan view of the cap nut, FIG. 4 is a longitudinal sectional view of the product, FIG. 5 is a plan view thereof, and FIG. 6 is a partially cutaway longitudinal sectional view showing a conventional manufacturing process. a... Cap nut with washer, 1... Nut, 2... Top surface part, 3... Bottom surface part, 4... Screw, 5... Through hole, 6... Step part, 7... Through hole,
8...Cap, 9...Washer, 10...Through hole, 11...Shank, b...Dice, 12...
... recess, 13 ... lower surface part, 14 ... recess, 15 ...
...Through hole, 16...Cushion material, c...Slider, 17...Top surface part, 18...Through hole, 19...
...Flame part, d...Slide holder, 20...Empty part, 21...Hook part, 22...Spring, 2
3...Die plate, 24...Punch, 25...
head.

Claims (1)

[Claims] 1 A die having a hemispherical recess into which the cap constituting the cap nut can fit, an open recess into which the nut constituting the cap nut can fit, and a slide holder located below the die and fixed to the die plate. A slider is provided in the chamber, which is supported by a spring, is slidable in the vertical direction, and has a through hole into which a punch fixed to the die plate is inserted. A cap nut is placed on the upper surface of the slider, with the stepped portion of the nut facing downward and coaxially with the through hole of the slider, and the spherical portion of the cap is received in the hemispherical recess of the die. On the other hand, a nut is fitted into the opening-shaped recess, and the stepped part protruding from the lower surface of the nut and the washer fitted into the stepped part are constantly supported by a slider that slides in the vertical direction, and the cap nut is inserted between the die and the slider. The die is further lowered, the slider pressed by the die descends, and the head of the fixed punch inserted into the through-hole of the slider enters the through-hole of the cap nut. A method for manufacturing a cap nut with a washer, characterized in that the washer is slightly fitted into the cap nut, and at the same time, the stepped portion is pushed outward, and the washer is caulked so as to be freely rotatable relative to the cap nut.