SU1250527A1 - Instrument for determining cutting forces and plastic deformation of easily deformable materials - Google Patents

Description

The invention relates to measuring instruments and can be applied in the timber and woodworking industries, agriculture, and timber industry when conducting research on cutting processes of easily deformable materials.

The purpose of the invention is to increase the accuracy and reduce the time for determining the end of plastic deformations and the start of cutting.

FIG. 1 shows the device, a general view; in fig. 2 - a knife with a sensor.

The device includes a frame 1 with guides 2, a movable frame 3 and a handle-drive 4. A drum 5 is rigidly attached to the frame 3, inside which are placed the sprung springs 6 and the lead screw 7 with the knife 8 and the writing device 9 at the ends. On the drum 5, through bearings 10, an oaraban 11 with a diagram tape 12 is mounted for rotation. In frame 1, a nut travel guide 13 with a driver 14 connected to the drum 11 is rotatably mounted.

On the knife 8, from the side of the rear face, a forward kinematic pair is mounted in the form of guides.

S () 5277

The sleeves 15, in which the rod 16 runs. At the upper end of the rod 16 a contact 17 is fixed, the housing 18 of which is mounted on the frame 1. In the initial position the spring 16 is held by the spring 19 (the stop limiting the downward movement, not shown).

The device works as follows.

 О When pressing the knob 4, the frame 3 with the lead screw 7 and the knife 8 is lowered. The nut guide 13 at the same time through the lead 14 turns the drum 11 with the chart tape

15 12. At the same time, the spring 6 is compressed and the writing device 9 records a force curve on the tape 12. At the initial moment, when the deformation of the bark 20 is performed, the rod 16 moves 20 s together with the knife 8 and the contact 17 remains open. When the plastic deformations are finished and the knife 8 smashes into the bark 20, its boundary layers lift the bar 16. The contact 17 is closed and a signal is sent to the writing device 9. The signal lamp is ignited and a point is marked in the diagram corresponding to the end of plastic deformations and the start of cutting.

Editor N.Gorvat

Compiled by V.Raspopova

Tehred G.Gerber Proofreader G.Reshetnik

4372/18

Circulation 778 Subscription

VNShPP USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

DEVICE FOR DETERMINING CUTTING FORCES AND PLASTIC DEFORMATIONS EASY-DEFORMABLE MATERIALS, including a bed, a knife, a sensor and a recording device, characterized in that, in order to increase the accuracy and reduce the time to determine the end of plastic deformations and the beginning of cutting, the sensor is made in the form of a rod movable along the knife, on the upper end of which is connected with the recording device, an electrical contact, the body of which is fixedly mounted on the bed, and the rod is mated to the knife by means of a translational kinematic pair, and the lower end of the rod is located above the cutting edge of the knife. SU „„ 1250527