SU942915A1

SU942915A1 - Tap

Info

Publication number: SU942915A1
Application number: SU803210030A
Authority: SU
Inventors: Феликс Николаевич Канареев; Александр Олегович Харченко
Original assignee: Севастопольский Приборостроительный Институт
Priority date: 1980-12-01
Filing date: 1980-12-01
Publication date: 1982-07-15

Description

(5) МЕТЧИК(5) METER

1one

Изобретение относитс к металлорежущему инструменту, а именно к метчикам .This invention relates to a metal-cutting tool, namely, taps.

Известен метчик дл нарезани крупных цилиндрических резьб, в пазах которого закреплены гребенки, которые расположены по окружности метчика неравномерно D 3.A known tap for cutting large cylindrical threads, in the grooves of which the combs are fixed, which are arranged around the circle of the tap unevenly D 3.

Недостатком известной конструкции метчика вл етс то, что он способен нарезать резьбу только с шагом и профилем, соответствующим шагу и профилю резьбы гребенок,A disadvantage of the known design of the tap is that it is able to cut threads only with a pitch and profile that corresponds to the pitch and thread profile of the dies,

Цель изобретени - расширение тех-,5 нологических возможностей резьбонарезани .The purpose of the invention is to expand the technological, 5 technological possibilities of thread-cutting.

Поставленна цель достигаетс тем, что в корпусе выполнено п радиальных 20 пазов, в которые помещены резьбонарезные гребенки, ыаг которых превышает шаг нарезаемой резьбы,а количество гребенок определ етс в зависимости от шага нарезаемой резьбы по формулеThe goal is achieved by the fact that in the housing there are made 20 radial grooves in which thread-cutting dies are placed, the stroke of which exceeds the pitch of the cut thread, and the number of combs is determined depending on the pitch of the cut thread by the formula

РМ-РН RM-PH

2 РН2 PH

где Р - шаг резьбы резьбонарезных гребенок;where P is the thread pitch of the thread-cutting dies;

шаг нарезаемой резьбы; thread pitch;

z число вставленных гребенок в пазы корпуса с угловымz the number of inserted combs in the grooves of the housing with angular

интервалом На фиг. 1 показан метчик, общийinterval In FIG. 1 shows a tap, common

вид; на фиг. 2 а,б,в - поперечные ,сечени метчика соответственно с двум , трем и п тью вставленными гребенками в пазы кбрпуга; фиг.З а,б,в - развертки рабочих поверхностей метчиков, изображенных на фиг. 2а,б,в.view; in fig. 2 a, b, c — transverse, tap sections, respectively, with two, three, and five inserted combs into the grooves of the drill-rod; FIGS. 3 a, b, c are sweeps of the working surfaces of the taps shown in FIG. 2a, b, c.

Claims

The tap contains body 1, in grooves of which thread-cutting combs 2 are placed, fixed by screw 3 with stop V and screws 3. Thread-cutting combs 2 are made from thread 3 9 beat Р, and in the workpiece thread is cut with step F. The number of inserted dies in the slots of the housing 1 is determined by the formula and they are located at angular intervals. For example, an MZhhb thread is made on the tap; 6 mm. In order to cut the threads in the M30x2 part, i.e. with Р 2 mm, it is necessary to fit the grooves of the tap-in-zl housing thread-cutting to restore Zbenks (Fig. 2a), with angular spacing. The tap is informed by the screw movement required for threading with a pitch of 2 mm, a screw groove is formed on the workpiece (see Fig. 3a) with a pitch P) 2 mm. Thus, the property of helix lines of different pitch is used to intersect at strictly defined points where the tips of the teeth of the tap are located. For threading M30x1.5, i.e. with a pitch of 1.5 mm pitch, into the grooves of housing 2 (5 s ... „-7-g- 5 threads threaded combs (Fig. 26) with angles spacing - then the tap screw movement required for threading with a pitch of 1.5 mm is generated, a screw groove is formed on the workpiece (see Fig. 36) with a pitch of Ru, 1.5 mm. The thread with a pitch of 1 mm is cut when installed in the grooves of the housing Z The f-thread-cutting dies (Fig. 2B) and the tap are connected by a screw motion for threading with a pitch of 1 mm (fi 3 c). The proposed tap has the following advantages. The chip enters the space between the 4th workpiece and the tap and does not interfere with the threading process (not packaged, etc.). Since the thread pitch of the tap is longer than the thread pitch, there is enough space between the thread to be cut and the groove profile. This prevents seizure, welding of the material of the workpiece to the side surfaces of the tap, which provides improved quality processed. surface. The possibility of cutting several thread sizes with a single tap is enhanced, which expands the technological capabilities of thread cutting, leading to savings in tool material. In addition, it is possible to reduce the nomenclature of taps. The invention includes a tap with a housing, in the grooves of which thread-cutting combs are placed, characterized in that, in order to expand technological capabilities, in the copepus there are p-radial grooves in which the thread-cutting combs are placed which step exceeds the thread pitch and the number of combs is determined depending on the pitch of the thread being cut according to the formula RM-RI where P „is the thread pitch of the thread-cutting dies; thread pitch; the number of inserted combs in the housing grooves with an angular interval is -E.E. Sources of information taken into account — for examination 1, USSR Author's Certificate ff 11P688, cl. In 23 G 5/06, 1958.