CS238112B1 - Cutting tool with adjustable cutting part - Google Patents

Abstract

The solution concerns a cutting tool, in which the placement and reinforcement of an adjustable cutting part is solved. The essence of the solution lies in the placement of the adjustable cutting part in the guide hole of the holder, the reinforcement of which occurs by circumferential clamping of the body of the adjustable part by the wall of the guide hole, which is interrupted by a longitudinal cut at the location of the reinforcement mechanism, whereby the thickness of the wall of the guide hole of the holder must be weakened on the outside in the part of the circumference so that the pulled part does not spring. The use is considered in all boring machines for producing precise holes, especially in PVS. '

Description

The present invention relates to a cutting tool in which the mounting and strengthening of the adjustable cutting part is solved.

Known construction of cutting tools with an adjustable cutting part solves the problem of strengthening the adjustable part in the set position, either by direct action of the clamping screw from the holder on the adjustable part or by a clamping connection by means of a deforming part of the holder.

The unambiguous orientation of the adjustable cutting portion relative to the holder during construction is achieved by suitable profiling of the bearing surfaces. In most of these constructions, the reinforcement of the adjustable cutting portion results in a change in the tool size due to the displacement of the reinforced portion in the build direction caused by tightening the clamping screw or by changing the orientation of the adjustable portion relative to the holder.

The rigidity of the connection of the adjustable cutting part with the holder is inadequate for precision machining in these constructions and, under cutting load, further random changes in tool size are caused by either additional clearance in the mounting of the adjustable cutting part in the holder or low contact stiffness . *

Many of the above-mentioned drawbacks are overcome by the cutting tool of the present invention such that the adjustable cutting portion is received in the guide hole of the holder such that the adjustable cutting portion is solidified by circumferentially clamping the adjustable body body through the guide hole wall. .

In order to achieve a perfect clearance clearance in the housing and thereby optimally grip the body of the adjustable cutting part, the wall thickness of the guide hole in the holder, at the periphery of the outside, must be weakened so that the contracted part does not spring.

A unique orientation of the adjustable cutting portion during assembly is provided by a spring pin fixed to the holder body, tangential to the longitudinal planar surface formed on the surface of the adjustable cutting body.

The main advantages of mounting the adjustable cutting part in the holder according to the invention are that it is simple to construct and manufacture, especially when using the adjustable part body of cylindrical shape and allows to achieve optimal cutting characteristics in terms of accuracy by increasing the rigidity Adjustable cutting parts with tool holder body.

A spring pin tangentially abutting the longitudinal surface on the body of the adjustable cutting portion ensures a clear orientation of the adjustable portion relative to the preloaded holder and thus free of play, regardless of tightening or loosening of the fastening bolt.

The attached drawing shows an exemplary embodiment of a boring bar with an adjustable blade bearing according to the invention, in which Figures 1 to 4 show the blade bearing in the holder body and in sections AA, BB and CC showing the location of the fastening bolt, spring pin and weakening the wall of the opening for receiving the knife body.

The cylindrical body of the boring knife is housed in a smooth guide hole drilled in the holder body, cut longitudinally through the cut 3 and clamped by the fastener with a screw.

The spring pin 6 bears tangentially on the longitudinal planar surface 7 on the surface of the knife body and thus ensures the orientation of the knife body 1 relative to the holder body 2. The differential screw 8 serves to fine adjust the knife 11 during adjustment.

The perpendicular cut 9 separates the resilient portion of the guide hole from the fixed portion in which the threaded head of the differential screw '8 is received.

The possibility of using the cutting tool according to the invention is in all boring machines for the production of precision holes and, in particular, is possible in PVS.

Claims (2)

OBJECT OF THIS 0 A cutting tool with an adjustable cutting portion mounted in a longitudinally cut guide hole of a holder, which is tightened by a fastening mechanism, eg a screw, characterized in that a through cylindrical bore in the holder (2) in which the adjustable cutting portion (1) is received is divided into a section cut by a longitudinal section (3) which is clamped by a fastening mechanism, for example a screw (4), and into a fixed part provided with a coaxial internal thread in which the head of the differential adjustment screw (8) is mounted. The openings are separated from one another by a perpendicular cut (9), terminated by a longitudinal section plane (3), and the wall of the cut-through portion of the opening above this plane is weakened from the outside. Cutting tool according to claim 1, characterized in that a spring pin (6) fixed to the holder body (2) bears tangentially on the longitudinal planar surface (7) formed on the surface of the body of the adjustable cutting part (1).