RU1830303C - Dynamometers mandrel - Google Patents

Description

a photodiode 10 is located. Between the tube 8 and the housing 1 there is a diametrical clearance. At the end of the pipe 8, there is a seat 11 for mounting a drill head or drill head. From rotation, the latter are fixed by means of two keys 12, which are fixed in the grooves of the pipe by 8 screws. These keys fit into the end slots of the tool. The fixing of these tools is carried out by a bolt that is screwed in place of the threaded cover 13. Inside the housing 1, a point light source 15 is installed in the sleeve 14. The source 15 is powered and the signals from the photodiode 10 are received through the electrical connector 16. The rough cutter or cutter block 17 is mounted in the groove of the housing 1 with bolts 18. The final cutter or cutter block 19 is mounted in the groove of the tool holder 2 with a bolt 20. The cutter block 19 (cutter) freely passes through the grooves in the housing 1 and the pipe 8. The inner cavity of the mandrel is closed about t chips therein with rubber caps 21 and screw 22. ..

The mandrel works as follows.

It is installed in the tool holder 23 of the cup and fixedly fastened by bolts 24. When boring, for example, with cutter blocks 17, 19, when the roughing tool 17 cuts into the workpiece 25, cutting forces arise on each cutting edge. Under the influence of the tangential components, the cantilever body 1 experiences torsional deformation. Before cutting, the light beam from the point source 15, reflected from the prism 7, enters the center of the photodiode 10. As a result of the torque due to the tangential components of the cutting force, the cross section of the housing 1 at the attachment point of the cutting unit is rotated in the direction of the torque acting with respect to section (II) - the mounting location of the mandrel body 1. In this case, the rod 6 with the prism 7 remains stationary, because sealed further (I-I). The torsion deformations of the housing 1 are called the rotation of the tube 8 with a photodiode 10 with respect to the rod 6 with a prism 7. As a result, the center of the photodiode 10 is displaced relative to the beam in the direction of the acting torque by an amount proportional to the magnitude of the latter. Photodiode 10 measures this deviation. An electrical signal proportional to this deviation is supplied from the photodiode 10 through the connector 16 to the amplifier-converter 26. There, this signal is set and compared with the signal from the driver 27. The signal from the device 27 is a reference and is proportional to the magnitude of the torque , which must be kept constant during processing for

stabilization of its power regime. In case of equality of signals from the UPA and the memory, the processing proceeds with a constant feed rate. At the same time, the final cutting unit 17 with clean cutting edges provides precision machining parameters. In the case of a change in the input data of the workpiece — the amount of machining allowance, hardness of the processed material or blunting of the rough tool, the magnitude of the cutting force and, consequently, the torque and twisting of the housing 1 changes. Photodiode 10 measures these changes. The consequence of this is the appearance of a mismatch signal in the VGA,

0 which is supplied to the ACS feed control unit and according to which the feed is changed. In this way, stabilization of the power treatment mode is achieved. At the same time, the finishing cutter block 19 removes a uniform allowance, thereby improving machining accuracy. When drilling, boring or coredrilling, boring, the mandrel works in a similar way. In this case

0, instead of the cutting unit 17, a drill head or drill head is mounted. As a finishing tool, a cutting unit 19 {which has an opening 28 for passage is used

5 rays of light) or cutter.

When bored with cutters, the device allows to measure the deformations of the housing 1 caused by the action of the resultant tangential and radial components of the cutting forces, which increases the accuracy of information acquisition, control and processing. Under the influence of the tangential component, the housing 1 twists, and under the action of the radial

5 of the component bends. As a result, the position of the photodiode with respect to the light beam in two directions changes in proportion to the magnitude of the resultant of these two constituents. For the rest

0 device operation scheme is similar to the above. During operation of the device, the finishing tool removes a small amount of allowance since the tool holder 2 is practically not deformed.

Claims (1)

5 claims A dynamometer mandrel comprising a tool holder with a cutting tool mounted in a hollow housing, a rod located inside the housing, and a housing deformation sensor, characterized in that, in order to improve the accuracy, productivity and cleanliness of the hole processing, the mandrel is equipped with an additional cutting tool installed on an additional tool holder, which is located inside the housing, and the sensor is made in the form of a light source, a reflective prism and a photodiode, wherein the light source is located inside the housing along its axis, the reflective prism is mounted on the end of the rod, and the photodiode is mounted on the outer surface of the housing, and in the tool holder and in the housing there are coaxial light guide holes, f3 f7 P AA noSeprtt / sriff FIG. Z gz Figure 1 /