SU1077726A1 - Apparatus for chamfering and cutting thread - Google Patents

Abstract

A DEVICE FOR REMOVING THE FACES AND THREAD CUTS, comprising a housing in which a spindle with a tap I is installed; a countersink, characterized in that, in order to increase tool life, a ring is inserted into the housing in front of the countersink cutting part, and the countersink housing is made the spindle is installed hollowly and axially displaced in it, and the countersink cutting part is made with radially spring-loaded cutting elements for periodic interaction with the ring. vj to

Description

The invention relates to a machine tool industry and can be used in particular in machine tools for simultaneous cutting and chamfering. A known device for two-sided countersink and threading in G12 nuts. This device requires two types of heads: countersink and thread-cutting. It is also known a device for chamfering simultaneously with threading by means of a tap mounted on a spindle and a spring-loaded cutter, which includes a stand with a stop mounted on the spindle with the possibility of axial movement of the tool post with the ring. In this case, the cutter, fixed in the tool holder, has a sharpening point, the same as the direction of the thread of the tap, and there is an S longitudinal groove of the tap. As the tool approaches the workpiece, the tool holder with tool is rotated and lowered together with the spindle, and the chamfer is machined with threading. The disadvantage of the known device is that, when reversed, the tool with its back part continues to move along the chamfer surface, which is on one side leads to increased wear of the cutter, and on the other - to the min- ing of the lead-in part of the thread. In addition, the location of the cutter in the longitudinal groove of the meter worsens the condition of chip removal. The purpose of the invention is to increase tool life. The goal is achieved by the fact that in the device for chamfering and cutting the cut, the chassis, in which the spindle with the tap and the countersinker are installed, is inserted into the front part of the countersink mounted in the housing, the countersink's body is made hollow and the possibility of axial movement is established by the spindle, and the cutting part of the countersink is made with radially spring-loaded cutting elements for periodic interaction with the comb. The drawing shows schematically the proposed device for chamfering and thread cutting, a general view in section. The device for chamfering and threading includes a housing 1, a spindle 2 on which a tap 3 is attached. A spindle 2 mates with a countersink body 4. Rotation to a spindle 2 is transmitted through a countersink body 4 from a drive pulley 5. A drive pulley 5 is connected to the housing A countersink is provided by a key b, which provides free axial movement of the countersink. A split of the countersink 7, which is an elastic element equipped with carbide-tipped cutting plates 8, is attached to the body 4. The elastic effect is achieved by making the split part ker 7 of spring steel, as well as its execution in the form of a hollow element with elastic petals. The closing of the split part of the countersink 7 is carried out in a freely rotating ring 9 installed in the bearing 10. The ring 9 is installed in front of the handle 11, the device operates as follows. From the machine drive, the rotation through the drive pulley 5 through the keyed connection b is transmitted to the spline part of the countersink body 4, with which the spindle 2 rotates with the tap 3 attached to it, the spline connection of the spindle 2 with the spline part of the countersink body 4 ensures their alignment and the possibility of free mutual axial movement. The spindle 2 and countersink 4 are fed from the camshaft of the machine. Initially, the countersink 4 moves in the direction of the workpiece. Permit part of the countersink 7 enters the ring 9, which starts rotation together with the countersink body 4, the force transmitted through the inclined outer surface of the split part of the countersink 7, compresses the spring-loaded cutters with cutting plates .8 Cutting plates 8 are closed and machined by a facy in the hole of the part 11. After that, the countersink 4 returns to its original position and when exiting the ring 9 it opens / opens the inner hole for passing the tap 3 to at this point to the workpiece 11 begins to move in the axial direction along the spline joint spindle 2, the tap 3 passes through the hole in the drilled part of the countersink 7, processes the part 11 and after reversing the rotation of the spindle 2 returns to its original position. The design of the countersink hollow with an internal spline connection ensures the rotation of both the spindle and the countersink from a single drive pulley. Besides. Such its implementation guarantees a high degree of alignment of cutting tools. The processing part of the countersinker, made split with spring-loaded

31077726

incisors, allowing to produce no effect, worsening

consecutive chip removal operations. Listed facts

chamfering and threading. As a result, increase the service life of the countersink.

Tat. Remove incisors from the surface about 2 times and improves the cutting edge of the hole during cutting.

Claims (1)

CHAIN REMOVER AND THREAD CUTTING, comprising a housing in which a spinner del with a tap and; The core drill is made hollow and the spindle is mounted in it with the possibility of axial movement, and the cutting part of the core drill is made with cutting elements spring-loaded in the radial direction for periodic interaction with the ring. < 16 3