SU564105A1 - Chuck for fixing taps - Google Patents

Description

(54) CARTRIDGE FOR FIXING METERS

i

The invention relates to a machine tool industry and can be used to secure taps during thread cutting.

Known cartridges for fastening taps, comprising a housing in which there is a sleeve carrying a tap holder, provided with an orienting cone

AND.

A disadvantage of the known devices is the lack of self-alignment of the tap through the hole in the cutting process, which leads to the need for very accurate manufacture of the cartridge and its strict orientation along the hole.

The proposed cartridge makes it possible to increase the accuracy of the thread being cut with less stringent requirements for the precision of the cartridge and its orientation over the hole.

For this purpose, two centering tracks were made on the outer surface of the sleeve bearing the holder, and in the case of the cartridge they were also made interacting with the sleeves of the sleeve only during orientation of the cartridge along the hole.

FIG. Figure 1 shows the proposed chuck for threading in through-holes, an axial section; in fig. 2, however, for threading in blind holes; in fig. 3 - a variant of the design of cartridges with the transfer of rotation through a movable spline joint; in fig. 4 is a section A-A of FIG. 3; in fig. 5 is a section BB of FIG. 3; on fng. 6-section BB of FIG. 3

The cartridge consists of a body I with a shank, a sliding sleeve 2 with the installation. 1 taper holder 3. The torque from the case to the sleeve is transmitted through the ball slot 4. The spring 5 unloads the tap from excessive axial forces. The tap is inserted into the hole of the tag and the holder, where it is centered by the center 6. The housing 1 and the sliding sleeve 2 each have two centers 7, separated by a recess, arranged so that they perform a hard orientation (centering) at

the uppermost position of the sliding sleeve 2 with the compressed spring 5, i.e. in the position when the combination of the axis of the cartridge with the axis of the hole on the cone of the tap holder by entering into the hole of the latter.

The cartridge works as follows. The chuck is fixed in the spindle of the radial drilling machine by the taper shank of the body I and is brought, when the machine spindle is loose, to the cut hole. Conic surface

the holder 3 is inserted into the cut hole

before contact, the axles are combined with a fully compressed spring 5, after which the spindle assembly is fixed. Met-;:; the tap-holder is inserted into the hole,;: - it is parametric with the center 6 and is brought to the rifling:.: i hole. 6 To avoid the harmful potential of axial cutting forces (the possibility of lateral cutting. Prof.:;) the spring 5 must be compressed, while the sleeve 2 is in the upper position. In this position, it is rigidly centered on two benches relative to the body of the cartridge. As the tap is screwed into the hole in the part, it moves the sleeve 2 down, centering it along the scaffolding of the housing 1, which allows it to move slightly in the angular and radial directions.

FIG. Figure 2 shows the proposed cartridge for tapping in blind holes. The torque from the machine spindle through the body 1 of the chuck, the outer and inner friction discs 8 is transmitted to the drive sleeve 9 mounted on the ball bearings. Sleeve

9 transmits .mo.ment to the movable along the axis of the sleeve 10 through the ball spline connection (11-balls, 12 - separator) and then through the tap holder 13 to the tap. The tap is centered at the center 14 (15 is the compression spring). On the mating surface of the sleeves 9 and

10 located 16 centering on the skis, separated by a groove. The cartridge operates similarly to the cartridge in FIG. one.

FIG. 3 shows the proposed version

design of the cartridges with the transfer of rotation to the sliding sleeve by means of a spline connection. Similarly to the previous one, the centering of the body 1 of the cartridge along the sliding sleeve 2 occurs only in the upper position of the sleeve 2 along the scam-spline joint with the running fit (across the width of the slot). The skins are located at the ends of the sleeve 2 and on the corresponding parts of the body 1 of the cartridge. In this case, the recess is replaced by an underestimate of the slot width in

the middle part of the mating of the housing 1 cartridge and the sliding sleeve (see Section. BB and BB).

Claims (1)

Invention Formula A cartridge for fastening taps, in the case of which an axially spring-loaded sleeve is installed, carrying a tap holder, equipped with a bore-oriented cone, characterized in that, in order to improve the accuracy of the cut thread, two centering holes are made on the outer surface of the sleeve, and in the case of the cartridge centering pockets are also performed, interacting with the sleeves of the sleeve only during the orientation of the cartridge over the bore. Sources of information taken into account in the examination: I. Journal “Machine tools and tools, 1971, № 6, p. 40 i6 / 2 9ut.3