JP2005231019A - Cold forming tap, nuts, and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold forming tap reducing imperfect thread by forming a straight hole in nuts, a machine tool, a plate, or the like by cold forming tap machining. <P>SOLUTION: A flank angle of a tip part 8 of the cold forming tap 1 differs between inside 4 and outside 3, and the outside 3 θ1 has a constant angle, while the inside 4 θ2 is gradually reduced with respect to a lead to have the same angle on the inside 31 and outside 3 on the way. A fill is gradually built up almost only on one side, and the fill is drawn to the inlet side to reduce the imperfect thread 5'. The number of crests with different angles on the inside 4 and outside 3 of the tap 1 is formed from 2 to 10 crests with the angle of α. With cold forming machining applied to the straight hole in the nuts, machine tool, plate, or the like using the tap 1, the imperfect thread can be reduced, and galling and seizure caused by oblique built-in can be effectively prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to nuts that prevent the screws from being assembled obliquely when screws are fastened and a tap to be manufactured.

  Conventionally, it is known that the galling and seizure of bolts and nuts is caused by being assembled obliquely to each other. In order to prevent such oblique mounting of bolts and nuts, the incomplete thread portions are reduced from each other to prevent biting of incomplete threads having no thread height. In the case of anti-galling and seizure bolts, rolling is performed with a die corresponding to the screw length, so that the incomplete thread can be reduced with the die processing shape of the tip. In the case of a nut, the position of the incomplete thread portion is reduced by cold working in advance to align the tap cut end, and the female thread is processed with a raised tap to reduce the incomplete thread portion, or cutting. The incomplete thread portion was reduced by cutting with a tap.

  However, when a female screw is formed in a straight hole of a machine tool, a plate, or the like, cold working cannot be performed and cutting scraps are generated, so there is a problem in mass processing. Further, in the case of the conventional nuts (7), when machining with the conventional raised tap, the entire threaded surface passes through from the tip to the end, so the surface angle before machining in FIG. 9 as in the conventional raised tap of FIG. 5 and 7, the angle of inner (33) θ1 outer (33) θ3 is the same because of the forming process in FIGS. In other words, it is formed at about 180 °.

Accordingly, an object of the present invention is to provide a raised tap (1) that can reduce imperfect threads (5 ') by machining a raised tap (1) in a straight hole such as a nut or a machine tool or a plate, and utilizing the same. By reducing the number of incomplete threads (5 ') by drilling through holes such as nuts and machine tools and plates that have eliminated incomplete threads, and effectively preventing galling and seizure due to oblique mounting. is there.

  In the present invention, as means for solving the above-described conventional problems, the flank angle of the tip threaded portion (8) of the rising tap (1) is different from the inner (4) outer (3), and the outer (3) is θ1. The inside angle (4) θ2 gradually decreases with respect to the lead, and the angle becomes the same inside (31) and outside (3). As shown in FIG. 6, the meat is pulled up to the inlet side to reduce the incomplete thread (5 ').

Of the taps (1), (4) and (3) the number of peaks with different angles is formed from 2 to 10 depending on the angle α.

The tap (1) is used to limit the nut (7 ') to which the incomplete thread portion (5') at the female screw inlet is reduced.

The manufacturing method is limited to the use of the tap (1) to increase the female thread in the nut (7 ') and the straight holes of the machine tool, the plate and the like as shown in FIGS.

According to the raised tap processing of the present invention, it is possible to reduce the incomplete screw thread of the female screw in the straight holes of nuts, machine tools, plates, etc., and effectively prevent galling and seizure due to oblique installation. it can. Further, since the number of incomplete threads is reduced, the fastening length of the female screw is increased by XX ′ as shown in FIGS.

Embodiments of the present invention will be described below.
A raised tap (1) according to an embodiment of the invention is shown in FIG. Unlike the inner (4) θ1 outer (3) θ2 flank angle of the tip threaded portion (8) of the raised tap (1) shown in FIG. 1, the outer (3) θ1 is a constant angle, and the inner (4 ) Θ2 gradually decreases with respect to the lead, and the angle becomes the same inside (31) outside (3) in the middle, gradually increasing the meat almost to one side as shown in FIG. 4, and entering the meat as shown in FIG. Pull to the side to reduce incomplete threads (5 '). If the surface angle β ′ before processing in FIG. 8 is set to 15 ° or less, the incomplete thread becomes less, and is generally within 45 °.

The number of crests of the tip (8) of the tap (1) inside (4) outside (3) with a different angle is formed from 2 to 10 crests depending on the angle of α. The soft material may be about 2 to 3 mountains, but the hard material is 4 to 10 mountains according to the hardness. Desirably, there are also processing such as bag holes, so about four hills are good.

By using the tap (1) to process the nuts (7 ') in which the incomplete thread portion (5') at the female screw inlet is reduced, the nuts for galling and seizing are obtained.

By using the manufacturing method in which the female thread is swelled as shown in FIGS. 4 and 6 using nuts (7 ′) and straight holes of a machine tool or a plate using the tap (1), even if the bolt side is obliquely inserted. Countermeasures against galling and seizure are possible. Further, as shown in FIGS. 6 and 7, the fastening length of the female screw is also increased by XX ′.

The present invention is not limited to the embodiment shown in the drawings, and various modifications can be made without departing from the scope of the present invention. For example, the oil groove (2) of the present invention may or may not be attached. Since the tip shape portion (8) of the rising tap (1) is the present invention, it may be used for a vent tap, a long shaft tap, or the like. Further, the tip shape portion (8) of the present invention can be used for millimeters, inches, tapers, and the like. Each apex of the tip-shaped portion (8) may be rounded for life measures or the like.

1 to 9 show an embodiment of the present invention.
Front view of raised tap of the present invention Detailed shape of the tip shape of the tap according to the present invention Detailed shape of the tip of the conventional tap Detailed drawing of the rising tap tip of the present invention Detailed drawing of conventional tap-up build-up Detailed view of raised tap tip buildup of female screw hole entrance of the present invention Detailed view of the conventional tap-up of the female tap hole inlet Nut using the rising tap of the present invention Nuts using conventional raised taps

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 The rising tap part 2 of this invention 8 Oil groove part 8 This invention front-end | tip part 3 Conventional and this invention outside angle surface (theta) 1 Conventional and this invention outside angle 31 This invention last inside angle surface 4 This invention inside angle surface (theta) 2 This invention inside angle 4 ' Inner intermediate angle surface 33 of the present invention Conventional inner outer surface θ3 Conventional outer angle α Tip machining angle 7 Female thread side 7 ′ in the conventional raised tap machining Female thread side S in the raised tap machining of the present invention The raised machining section S1 of the present invention Conventionally Conventionally raised processed part inlet side 9 Thin part of conventional raised processed part 5 Conventional incomplete threaded part 5 'Incomplete threaded part 6 of the present invention Completely threaded part β Conventional female thread Surface angle β ′ before processing Surface angle before female thread processing of the present invention

Claims (4)

In the female thread forming raised tap, the flank angle of the tip female thread processing part of the tap is different from the inside and outside, the outside is a constant angle, the inside is gradually smaller than the lead, and the angle is the same inside and outside in the middle A raised tap featuring the. The rising tap according to claim 1, wherein the number of peaks of the inner and outer angles of the tap is 2 to 10 peaks. Nuts that use the tap to reduce the incomplete thread at the female screw inlet. A manufacturing method in which the tap is used to increase the number of incomplete screw threads at the entrance of the female screw in a straight hole such as a nut or a machine tool or a plate.

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