JPS5834216A - Tapping screw with washer and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Book! I-beak relates to tapping screws with washers and their manufacturing methods.In recent years, threaded parts KTo have been incorporated into swaged washer tubes.
Thread rolling can be carried out after incorporating an inner IIO washer smaller than the outer diameter of the screw into the rolled screw material, but in the case of self-tapping screws, drill a pilot hole in a steel plate, etc., and tighten while forming the female thread thread. Due to the nature of the work being done with the tapping screw itself, it is necessary to carburize and harden the tube to increase the surface hardness, especially after thread rolling on the thread material. The manufacturing process 1 for making all the self-tapping screws with round washers was complicated. That is,
A rolled screw material formed by *Wt forging is assembled with a copper plated (carburized anti-carburizing) flat washer to prevent carburization, and then the screw is rolled, carburized and quenched, and then the steel of the flat washer is rolled. It was falling all over the place. In this way, copper plating V!
-More expensive work such as falling off the applied parts increases, the work time becomes scary, and the screws are rolled after inserting flat washers.
There was a defect that K was unsuitable for tightening because there was an incomplete threaded part left next to the screw W and near the flat washer.
If anti-carburizing plating is not used, either manually fit it in when using flat washers for TTL, or ieF! Before use, flat washer tII
This was done manually by gluing it to the self-tapping screw with adhesive or the like.

The purpose of this W140 is to remove the above defective pipe and screw **
An object of the present invention is to provide a self-tapping screw with a washer that has a nearly complete thread and can be easily manufactured mechanically, and a method for manufacturing it.
This will be explained in more detail. ◎ 1st w shows the self-tapping screw with washer according to the present invention. The KJ@ self-tapping screw 10 includes a normal tapping screw 1-, which has a recess 12 with which a tightening tool engages, and a shank portion 1- having a thread 14t. l [l114 and cI1
180f [K, screw 14 () smaller than the outer diameter - inner diameter, °
Preferably, an annular outward projection @20 is provided which projects outward.

On the other hand, the flat washer made of mild steel installed in this tapping screw 10 is an annular inner part that protrudes inward from one edge of the inner periphery of the hole 520 due to the main part 11! +4 is formed Thjl), soO inward loss @ 34 () Since the inside II is larger than the outer diameter of the outwardly protruding portion 20 of the tapping screw 10, the flat washer go is prevented from falling off.

Note that there is an incomplete thread 1 near the head of the tapping screw 10.
6'' is formed, it will be clear that it is not necessary to provide the outward protrusion 2Jf.

Next, the manufacturing method of the O plain washer type tapping screw described above (see Fig. 2 and FMS@) will be explained. The tapping screw 10 used in the present invention is manufactured in the same process as the general tapping screw manufacturing process. This can be done by making one without the protruding part 20, or by simultaneously forming the annular O outwardly central part 2tlli when thread rolling with a screw thread die.〇The plain washer 30t11 shown in Fig. 3 K to be manufactured is tapping screw 100
The inner diameter is much smaller than the outer diameter of the screw! 0 flat gold 500 holes,
The inner circumferential edge of the hole is shaped like 54゛O so that it protrudes outward in the axial direction on one side, and at that time, it is formed to form an axially central edge *S4
C) Make the inner diameter slightly larger than the outer diameter of the self-tapping screw so that it can be inserted into the self-tapping screw.
'Completed separately, insert the flat washer 501 tapping screw IOK toward the bearing surface of 9 tapping screw 10 ll1w14. Then, the shaft of the self-tapping screw 10 can be shown in FIG. Insert LK and flat washer 50
Place the receiver on a 4g stand. Next, when the die 42 having an eye corresponding to the head 14 is struck and pressurized, the axially inner deep edge 34' of the flat washer 5otvH is compressed and deformed inwardly. As shown in FIG. 1, an annular inner molar portion 54 is formed which is molar inward in the radial direction.

In the tapping screw with a washer of the present invention, there is an inner back toothed portion s4 WIIEL that teeth inward from the inner circumferential surface of the hole of the plain washer, and an incomplete screw 9 near this inner collecting portion 540 inner diameter t screw **
/i 14' is the outer diameter of the annular outer molar tooth w2fl]
Since the flat washer 30 is small, it is absolutely impossible for it to fall off from the self-tapping screw 10. In the method for manufacturing a self-tapping screw with a washer of the present invention,
The tapping screw 10 and the flat washer are made in separate O machines and then assembled, so there is no need to remove the flat washer with carburizing plated 9%, and the tapping screw can also be screwed to nearly l1ls. Since T-rolling is possible, even when fastening a thin plate, regardless of whether the thin plate is incompletely threaded,
According to the manufacturing method of the present invention, self-tapping screws with counterfeeding can be easily manufactured mechanically without manual work.

[Brief explanation of the drawing]

1st! Il is a side view including a partial cross section of the tapping screw O with a washer according to the present invention, FIG. 2 is a side view including a partial cross section of the tapping screw O of the present invention, FIG. It is a side view including a half section W of a flat washer in a state before it is assembled into a tapping screw. 1o-・Tapping screw 14-・・Head 18-・Shaft 30・・Flat washer s4・-・Inner molar part agent Ezaki party history 1-'-] Fig. 1 12 'I2rM 17M3 Fig. 0 90

Claims (1)

[Scope of Claims] 0) A tapping screw consisting of a shaft and a tightening tool having a rounded retaining hole; 1ji1-%A on a washer-attached pin screw consisting of a flat washer and an adjacent flat washer,
The flat washer has an inward central tube that protrudes radially inward from the inner circumferential surface of the hole, and the inner diameter of this inwardly protruding portion is smaller than the outer diameter of the shaft of the self-tapping screw. Tapping screw with washer〇) The inward protrusion is on one edge of the inner peripheral surface of the hole: T
A tapping screw with a washer according to claim 1, which is an annular protrusion. (Xu) A patent claim that has an outward protrusion vI7s that extends outward between I[s of the tapping screw and the threaded part, and this outward protrusion has an outer diameter smaller than the outer diameter of the threaded part. !!Tapping screw with washer according to claim 1. (4) Tapping screw with washer according to claim IIIs, wherein the outward protrusion is a threaded part or annular protrusion without a lead angle. (6) A self-tapping screw consisting of a shank having a retaining hole for a tightening tool, and a flat washer inserted into the shank of the self-tapping screw and non-removably adjacent to the round washer. A self-tapping screw with a washer, which has an inward central protrusion that protrudes radially inward from the inner circumferential surface of the O-hole, and the inner diameter of this inward protrusion is smaller than the outer diameter of the shaft of the self-tapping screw. In the manufacturing method, a self-tapping screw with an awe (manufactured by normal manufacturing process using thread material alone, and on the other hand, one side of the plain washer has an inner diameter slightly larger than the external diameter of the self-tapping screw). Insert the flat washer into the tapping screw O shaft part toward the flat washer O axial central edge [screw*StW, Axial direction 1 by applying pressure to the seat surface of washer tl1! A manufacturing method in which the edge w' is compressed and deformed radially inward to form a radially inward protruding shadow, and the flat washer is integrally assembled with the self-tapping screw. Insert a flat washer with an axial center edge St, insert a tapping screw into the 0 hole of the stand, place the flat washer on the stand, and then insert the tapping screw II [IIK- The scope of the patent claims that pressurizes by hitting the monitoring part!
II [OII manufacturing method described in item 5 〇 (7) Tapping screw 0 At the thread rolling factory, the outward protrusion of the award between I [ll and screw 110 @Building method.