DD296630A5 - Single knife REAMER - Google Patents

Abstract

A knife reamer (1) with a knife head (23) having a knife plate (5) and two guide strips (7, 9) is proposed, which is characterized in that the guide strips are made of plastic. Fig. 2 {knife reamer; Knife plate; Fuehrungsleiste; Cutter head; Plastic}

Description

embodiment

The invention will be explained in more detail below with reference to the drawing. Show it

Fig. 1: a front view of a cutting reamer;

2 shows a side view of a cutting reamer;

3 shows a cross section along the drawn in Figure 2 line HI-III and

4 shows a cross section along the line IV-IV drawn in FIG.

The front view according to Figure 1 shows that the incising reamer 1 has a substantially cylindrical base body 3, in the peripheral surface grooves for receiving a blade plate 5 and a first guide bar 7 and a second guide bar 9 are introduced. The grooves extend substantially in the longitudinal direction of the tool and thus also in the direction of the axis of rotation 11 of the reamer. 1

In the embodiment of the reamer illustrated here, the knife plate is accommodated in a first groove 13, the first guide strip 7 in a second groove 15 and the second guide strip 9 in a third groove 17.

The guide rails are secured by an adhesive in the grooves. For example, an adhesive is used which cures at a maximum of 200 ^° C. As a result, the tool retains its properties achieved through compensation.

When machining a hole whose wall is indicated here by a circle 19, the tool rotates in the direction of the arrow. In this case, the first guide strip 7 of the knife plate 5 lags behind by about 40 °. The second guide rail is arranged on the circumference of the base body 3 opposite the blade plate 5.

The voltage applied to the bore wall 19 surface of the guide rails has a radius which is slightly smaller than that of the bore wall. This ensures that the lubricant film formed by the lubricant is not sheared off.

From Figure 1 it can be seen that the recording of the blade plate serving groove 13 also has its front side seen in the direction of rotation a lower boundary wall than on the back. In the area of the front side of the knife plate, the base body is removed to form a chip space 21, which serves to remove the chips produced during the machining of the bore wall 19.

From the side view of Figure 2 it can be seen that the cutter head 23 of the cutting reamer 1 has a larger outer diameter than the adjoining the cutter head shaft 25. The shaft ends, according to Figure 2 at its left end, in a neck, the Attachment of the tool in a machine tool is used.

In Figure 2, the blade plate 5 and the opposite second guide bar 9 can be seen. It can be seen that the guide rails for optimum guidance of the cutter head 23 in the machined bore are longer than the blade plate. 5

This is held by a screwed into the body 3 clamping claw 27, wherein a clamping screw 29 is guided by the body of the clamping claw. From this illustration, as well as from Figure 4, it can be seen that the top 31 of the clamping claw 29 facing away from the blade plate 3 is aligned with the surface 33 of the base body 3 delimiting the chip space 21. The removed from the blade plate shavings are thus hindered by the clamping claw in any way.

From Figure 2 it is still apparent that the blade plate 3 can be pushed out by suitable screws 35 and 37 more or less far from the associated groove 13 in the radial direction. This serves for the diameter adjustment of the incising reamer 1.

The surface of the guide rails 7 and 9 falls in the direction of the front side 39 of the tool, so seen in the feed direction, slightly from. This results in a better introduction of the tool in the bore to be machined. At the same time, the load on the surface of the guide rails is reduced.

Figure 3 shows a section along the reproduced in Figure 2 line HI-III, wherein like parts are provided with the same reference numerals.

It can be seen that the screws, of which here the screw 35 is visible, are screwed into a running at an angle to the vertical bore 41, wherein the bore with an internal thread and the adjusting or adjusting screws 35 and 37 provided with an external thread are. The screws do not act directly on the blade plate 5 a. Rather, they press an adjusting wedge 43 against the underside of the blade plate, which has a corresponding bevel in the contact area with the blade plate.

The further the adjusting screw 35 is screwed into the bore 41, the further the knife plate 5 is pushed out of the associated groove 13 and the diameter of the tool 1 is increased.

By along the reproduced in Figure 2 Line IV-IV cross section through the incising reamer 1, the attachment of the blade plate 5 in the main body 3 of the reamer is clear.

The G 3 round body penetrates a running at an angle to the horizontal bore 45 with an internal thread. With this meshes an external thread of a first threaded portion 47 of the clamping screw 29, the second threaded portion 48 meshes with the internal thread of a clamping claw 27 penetrating bore. About the outer surface of the clamping claw 27 projects a clamping lip 28 which rests on the - seen in the direction of rotation - front of the blade plate 5 and on the knife breast and this with its back against the rear boundary wall of the groove 13 and with its lower edge against the wedges 43rd presses and thus clamped in the main body 3 of the cutting reamer 1.

From the above it is clear that the cutter head 23 of the cutting reamer 1 is set in the processing of a bore wall 19 in rotation, so that here designed as a turning plate blade plate 5 with its protruding from the groove 13, active cutting edge chips from the bore wall decreases. The thereby introduced into the tool forces are absorbed by the guide rails 7 and 9, which are supported on the bore wall.

Due to the choice of special plastics is avoided that material deposits from the bore wall on the surface of the guide rails, or that welds take place, whereby the smooth surface of the guide rails would have projections that dig grooves into the bore surface and destroy them.

From the illustrations it can be seen that the diameter of the tool is determined by the maximum distance of the active cutting edge of the blade plate 5 to the surface of the opposite second guide bar 9. By deposits on the surface of this guide bar 9, the diameter of the tool increases, so that the dimensional accuracy the machined hole is no longer guaranteed.

The friction between the surface of the bore wall and the guide rails leads to a load on the guide rails. The fact that the frictional forces are reduced, in particular by Teflon inclusions in the guide rails, the thermal load on the guide rails is greatly reduced. This significantly increases the service life of the tool

 At the same time, the plastic guide rails 7 and 9 form, as it were, an insulating layer between the surface 19 of the bore heated by the machining and the base body 3 of the incising reamer. The tool thus heats less when machining a hole. This leads to a reduced load of the tool, but also to the fact that the coolant flow can be reduced.

Claims (4)

1. knife reamer with a knife plate and two guide rails having cutter head, characterized in that the guide strips (7,9) are made of plastic. 2. knife reamer according to claim 1, characterized in that a self-lubricating plastic is used as plastic. 3. knife reamer according to claim 1 or 2, characterized in that the guide strips (7, 9) made of plastic with a Teflon portion / with Teflon inclusions. 4. knife reamer according to one of claims 1 to 3, characterized in that the guide strips (7,9) are fastened by means of adhesive in each case in a in the base body (3) of the cutter head (23) introduced groove (15,17). For this 2 pages drawings Field of application of the invention The invention relates to a knife reamer with a knife head having a knife plate and two guide rails. Characteristic of the known state of the art Known one-knife reamers have a cutter head, in the circumferential surface of which recesses extending essentially in the longitudinal direction or in the direction of the axis of rotation of the tool are inserted, in which a knife plate and two guide strips are arranged. The knife plate is held by a suitable clamping device, such as a clamping claw; the guide rails are soldered or glued to the main body of the cutter head. The cutter head goes into a shank and this into an approach for clamping the tool in a machine tool. For machining bores, the tool is set in rotation and lowered into a bore of the stationary workpiece. It is also possible to set the workpiece in rotation and firmly clamp the tool. During the machining of bores, a coolant and lubricant is used, which dissipates the heat generated during machining of the blade plate, builds up a lubricating film between the guide rails and the bore wall and dissipates the chips. The coolant and lubricant consists of an emulsion whose fat content is being further reduced for reasons of disposal of the chips added with the emulsion. In particular, when machining bores in aluminum and aluminum alloys, it comes to the conventional carbide guide strips to welds. That is, material of the machined bore wall settles on the guide rails. Their smooth surface is thereby destroyed. The material application leads to damage of the machined surfaces. Moreover, the effective diameter of the tool changes. For a fine machining of holes is no longer possible. Explanation of the essence of the invention It is therefore an object of the invention to provide a Einmesser-reamer, with which even when using low-fat emulsions fine machining of bore surfaces, especially in aluminum and aluminum alloys, is possible. This object is achieved with a knife reamer of the type mentioned with Hife the features listed in claim 1. The use of plastic guide rails virtually eliminates the deposition of bore wall material on the surface of the guide rails. As a result, optimum surface quality is achieved even when machining bore surfaces in aluminum and aluminum alloys using lean emulsions. The set diameter of the tool is maintained over a much longer time, so that the dimensional accuracy of the machined bore is increased. Particularly preferred is an embodiment of the knife reamer, in which a self-lubricating plastic is used for the guide rails. In this way, the friction between the guide rails and the bore surface is reduced, so that heating and damage of the guide rails is avoided. Thus, a reduction of the coolant flow is possible. Particularly preferred is an embodiment of a knife reamer, wherein the plastic material of the guide rails Teflon inclusions, which lead to a very strong reduction of the friction between the surface of the guide rails and the bore wall. By reducing the friction a particularly smooth running of the tool is achieved, which benefits the surface quality of the bore wall. Finally, an embodiment of a cutting reamer is preferred in which the guide rails are glued to the cutter head. This is inexpensive mounting method. Moreover, replacement of the guide rails is easy to carry out. -н- 5 13 21 19 Fig.1 л 27 Ж Ж ^х 29 ²³ '\>35' Fig. 2 Fig. 3 Fig. 4