CS201359B1 - Device for determination of relative workability of materials - Google Patents

Description

CZECHOSLOVAK SOCIALIST REPUBLIC DESCRIPTION OF OUTSTANDING 201359 (Π) (Bl) (19) TO COPYRIGHT CERTIFICATE (51) Int. Cl.3 G 01 N 3/58 (22) Registered 30 10 78 (21) (PV 7037-78) (40) Published 29 02 80 OFFICE AND DISCOVERY OFFICE (45) Issued 15 06 82 (75)

Author of the invention VASILKO KAROL doc. and ĎURANOVA EVA, ŽILINA (54) Equipment for determining the relative machinability of material

BACKGROUND OF THE INVENTION The invention relates to a device for determining the relative machinability of a material in short-term test conditions.

The methods known so far for determining relative machinability are based mainly on long-term turning tests, the relative wear of the tool after machining a certain amount of material. These tests are very time consuming requiring a large amount of material. Short-term machinability tests are known by test labeling, face turning, low blunting test, or blunted test, are very precise and do not adequately reflect the dispersibility of the machinable materials. In addition to the above tests, indirect tests are known in which the machinability is based on some physical or technological properties of the material. This property may be thermal conductivity, abrasion resistance, strength, hardness, etc. As in the previous tests, these tests only give approximate results. results because changes in physical and technological properties are not always proportional to the change in material machinability. The indirect methods include eg. the Leyenseter hammer method, which consists in measuring the depth of penetration of the test tool into the workpiece while it is being tapped with a constant force. When drilling under constant pressure, the drill is loaded with permanent force. The degree of machinability is a deep-drilled hole. The calculation methods are based on the assumption that the durability of the tool is related to the cutting temperature or compression of the chip according to a particular relationship. However, such a calculation does not affect the dispersion of the properties of the material, since it only considers the mean values of the variables.

The aforementioned drawbacks of the prior art are resolved by the solution of a device for determining the relative machinability, based on the principle of a stepwise cutting of the knife into the workpiece, which is based on a longitudinally movable blade positioned against the housing and spring the other end being supported by the carrier with the bolt, the bolt being clamped obliquely to support the specimen. Another feature of the inventive device is that a dynamometer sensing element is located in the back of the knife. An exemplary embodiment of the device according to the invention shown in the drawing in a horizontal arrangement.

A knife 3 is slidably mounted on the rails 2 on the rigid frame of the device 1. In the rear part of the knife there is a guide sleeve 4 in which a spring 5 is inserted, the lengths 1 is a spring.

Claims (2)

The carrier 6 is provided with a thread in which the screw 7 engages. The screw is a control wheel 10. A sample of the test material 9 is fastened in the clamp 8 before the wedge clinic 3. The sample is attached obliquely to the movement of the tool. A dispenser 11 is disposed in front of the knife face 3. The operating principle of the device is that when the handwheel 10 is rotated, the shifter 6 moves in the direction of the blades 3, thereby compressing the spring 5 which presses it onto the knife 3 and moves it to the workpiece. There is a gradual cutting of the workpiece knife 3, so that the depth of the cut increases. As a result of further compression of the spring 5, the pressure on the blade 3 is increased. The compression rate of the spring 5 is measured by the outer gauge and the spring 5 being received is the size of the force acting on the knife 3. The displacement of the knife 3 is registered by a gauge 11 which is positioned opposite the knife face 3. The actual tilt angle of the test sample 9 can be used to determine the instantaneous The depth of the cut. The measurement result is shown as the dependence of the cut width on the force acting on the tip 3. Me- pPedmEt An apparatus for determining the relative machinability of a material, based on the principle of stepwise cutting of the knife into a workpiece, characterized in that a tray (3) is movably arranged in the frame (1) for longitudinal movement. leaning against the housing (4) and the spring (5), the other end of which is supported by a ratchet of relative machinability of the material compared to the standard material, while the ratio of force corresponding to the strength corresponding to the standard material at the same depth of cut. The device can be used for the operational evaluation of the machinability of the material before it enters the machine tool. The sample size can be adjusted to minimize the need for material. The advantage of the device is the possibility to select a test sample from a predetermined location of the workpiece, eg from a center or perimeter. For the operational evaluation of the machinability, it is sufficient to load the knife with a constant force, that is, the weight and evaluate the machinability by the magnitude of the path to be transferred. Similarly, in the above example, the measurement can be simplified by always setting the posh to a position that corresponds to the corresponding depth of cut. Again, the measure of machinability is the ratio of forces, for the tested and standard material, at the selected thickness of the cut. It can be accelerated by placing a force transducer instead of a spring. on the piezoelectric principle, the sensor cell of the dynamometer and the like. a threaded carrier (6) actuated by a screw, wherein a clamp (8) for clamping the sample (9) is disposed obliquely to the knife movement. 2. Apparatus according to claim 1, wherein a dynamometer sensing element is disposed in the rear of the knife (3). 1 drawing