SU78523A1 - A device for determining hacking and optimum cutting conditions for coal and similar materials - Google Patents

Description

The subject of the invention is a device for determining hacking and optimal cutting conditions for coal and similar materials, which differs from the known kind of equipment in that it uses the kinematic energy of a free falling tartar, which has a cutting test material .

Using the device, the cutting process is evaluated, for example, grinding, dispersing, whereby the basic parameter is taken to be the energy hardness HW, representing the sum of the energy of formation of new surfaces and elastic deformations, i.e., the cutting work per unit volume, destructible cutting coal.

The schematic drawing shows the device in two projections.

A clamping device for the sample of the test material is located at the base of the instrument Ilit 1, which allows using the screw 2 to move the specimen in the direction 53 Svod. Issue 2; h, I, 1950

transverse to the swing plane.

The rim 3 rotates on the ball bearings on the fixed shaft 4, located between the stanchions 5, and has a dies, fused with two cheeks 6. Head 7, in which a chuck 8 is installed, intended for cutting the material to be tested.

To measure the angular displacements of the tambour, a measuring device 9 is used, made of a graduated dial and a movable W, connected to the tang.

The // latches are designed to hold the tempered in a caged state.

Samples are tested as follows.

A sample of coal or rock, having the form of an oro-angled prism, is enclosed in a clamping device.

The tooth 8, located in the head 7 of the tangent 3, is used to pretreat the surface of the sample that receives a curvature whose radius is equal to the distance 833

from the shaft axis to the tip of the chuck. With the help of a viit 12, which serves to move the chuck vertically, according to the test conditions, the chuck is extended and the latch 11 is set at an angle defining a predetermined cutting speed.

The area of the cutting face is selected at the same time by the erticular and transverse feeds of the insert and the sample.

By mathematical processing of test results, the following are determined:

5-way cutting,

L-work cutting,

V.-cutting speed.

The cutting speed V is defined as the arithmetic average between the meeting angle p ° and the angle. closure and specimen measured by measuring device.

The transverse profile cut by the notch of the slit in the sample corresponds to the projection of the cutting facet of the insert onto the vertical, therefore the volume of the destroyed coal is measured by the product of this area and the cutting path.

Volumetric energy hardness is measured as a work reference to volume:

rj A 1-yy kgcm. Medium acting; cutting force is:

R

-kg

The determination of the relationship between the volumetric energy hardness by cutting and the wear resistance of the tool is carried out with the aid of a master plate and is followed by the weight and linear measurements of the bit.

Subject invention

1. A device for determining the incidence and optimal cutting conditions of coal and similar materials, characterized in that, in order to use the free-falling body for the kinetic energy measurements, it is made in the form of a master equipped with a head mounted on the stands intended for cutting when the material is placed on a clamp mounted in a clamping device located on the base of the device, with the possibility of moving IB transversely to the direction of the swing, and it is equipped with devices for measuring the angular displacements of the master in the form of a moving arrow associated with the latter.