SU1463393A1 - Method of testing the cutting tools for wear-resistance - Google Patents

Abstract

The invention relates to the field of machining materials by cutting and can be used when testing cutting tools. The aim of the invention is to expand the range of feeds studied and reduce the labor intensity of the process. For this, the end surface being machined in one or several passes from the center to the periphery with a continuous increase in the cutting speed to the established criterion of blunting of the cutting tool is divided into groups of ring sections, setting their number in each group equal to the number of feeds studied, and the diameters the circles of the ring sections, the magnitudes of the feeds being examined and the spindle rotation frequencies are set according to the dependencies L; „d, Cf, rn {p - () + (i-0, 2 (; - h s, s, c, --- i p ,.;, s, 1-n-i.-ni, where (Jf is the proportionality coefficient (for universal machines — denominator of the spindle rotation frequency series); ha — number of feeds being examined — i — order number of feed in the test row —–, q — number of groups of ring sections, p — order number of group of ring sections of any pass; k - the serial number of the passage. 1 or 1 table S (L

Description

 one

The invention relates to the field of machining materials by cutting and can be used when testing cutting tools.

The aim of the invention is to expand the range of feeds studied and reduce the labor intensity of the process.

The drawing shows the breaking of the end surface of the sample with concentric circles.

The wear test method of cutting tools is as follows.

The face surface of a cylindrical specimen with a central hole made of the test material is divided into annular sections, the number of which is a multiple of the number of tested feeds, and the ratio of the values of diameters limiting any annular section is equal to the denominator of the frequency of rotation of the machine spindle. The ring sections are grouped in such a way that the number of ring sections in the group is equal to the number of the tested for & 9

1A63393

yach The magnitudes of the studied innings are based on

S

iff

2 (1-0

(one)

with

- coefficient of proportionality (denominator of the number of frequencies of rotation of rotation); the order number of the feed in the test row; the magnitude of the feed in the first ring section of the first pass i the e value of the feed rate of the test row; ranks of diameters of neighborhoods of ring sections according to

S, S: Where

d

H

w (p-i) -f (i-0

diameter of the central hole in the specimen

: m is the number of studied feeds; p is the group serial number

annular sections of any passage i - the serial number of the feed to

Investigated row range; and the number of tools examined is chosen to be a multiple of the number of feeds studied.

Further, the corresponding cutter on the appropriate test feed 1 | 1 rotated from the center to the periphery of the corresponding annular portions of the first group. The frequency of the spindle is determined by the dependence

; ..

(2)

the value of the spindle rotation frequency on the i-th feed, the p-th group of ring sections; ,

the value of the spindle rotation frequency in the first annular portion of the first pass; denominator p yes frequencies

spindle rotation; the sequence number of the passage-, the number of groups of ring sections, | ---;.

ase to allow the feeds to be passed through the same speeds

0

five

0

five

0

At certain intervals, the wear of the tool is measured at the main back surface. If the wear does not reach the established bluntness criterion on the ring sections of the first group, the tipping continues on the corresponding ring sections of the second group. Here, the rotational speed is determined by the relation (2), while the tipping on all the studied feeds is also carried out at the same cutting speeds, and at the transition from the ring sections of the first group to the ring sections of the second group, the cutting speed is continuously increased.

If the wear of the incisors under investigation on the main back surface did not reach the established blunting criterion on the first pass, then the machining again starts from the center to the periphery according to the scheme presented and so on until the established blunt criterion is reached. At the transition from one the passage to another is provided with a continuous increase in the cutting speed, which is also achieved by selecting the spindle rotation frequencies according to (2).

Example. The end face of the sample is divided into four ring sections (a multiple of the number of feeds studied), which were combined into two groups. On each aisle, the first and third annular sections with the first test feed were pierced from the center to the periphery by the first investigated incisor, and the second and fourth annular sites with the second test feed were used with the second investigated incisor.

The table shows the test procedure for the

5 examples in three passes.

It follows from the table that the ratio of the external and internal diameter values of any ring section is equal to the denominator of the number of rotational frequencies

0 spindle; The quantities of the innings studied are selected according to the relation (1); the magnitudes of the spindle rotation frequencies are chosen according to the relation (2) -, the initial cutting speeds on the annular

5 sections of the second group are equal to the final cutting speeds on the ring sections of the first group (there is a continuous increase in the cutting speed when moving from the ring sections

five

0

51D

the first group on the ring sections of the second group); The initial cutting speeds on the ring sections of the first group of the subsequent pass are equal to the final cutting speeds on the ring sections of the previous pass (there is a continuous increase in the cutting speed when going from one pass to another).

As a result of tests according to the proposed method with minimum labor intensity and maximum assurance of the identity of the test conditions, the following can be obtained:

average wear rate of cutting (speed corresponding to the established bluntness criterion);

coefficient of relative stability (the ratio of average wear speeds of the compared options) j

a curve (realization) of wear to the established criterion of blunting;

the dependence of V-T (cutting speed tool life).

The proposed method is advisable to use as an express method for comparative testing of wear resistance of carbide tools with new design and technological solutions or tools equipped with superhard tool materials, as well as for the calibration and control of wear resistance of individual batches of tool materials. The application of this method is especially effective if it is carried out on CNC machines with automation of changes in the feed and rotation frequency of the tool removal spindle j when the tool reaches the established blunt criterion, etc.

Formula

the invention

The method of testing the cutting tool for wear resistance, which includes rolling up to the established blunting criterion with a continuous increase in the cutting speed in one or several passes from the center to the periphery of the end surface of a cylindrical specimen with a central hole,

characterized in that, in order to expand the range of test feeds and reduce the labor intensity of the process, the end surface is divided into groups of ring sections, set their number in each group equal to the number of feeds studied, and the diameter values of the circumferences of the ring sections, rotational speeds pshindel set according to

d.

d c tp- bt -O

15

sr

,, 1-1.

0

25

35

n;, n, Cf

V (K-ii - (; - 0- ()

i

40

45

50

where d is the i-ro inner diameter

  rings in the p-th group of ring sections;

d, is the internal diameter of the sample; ,

if is the coefficient of proportionality (for universal machines, the denominator is the number of spindle rotation frequencies) -,

m is the number of feeds examined;

p is the group serial number

ring sections of any passage;

i is the order number of the submission in the tested supply chain, is the value of the supply quantity on the i-M ring section of any group of ring sections;

the magnitude of the feed in the first ring section of any group of ring sections,

- is the frequency of the spindle rotation on the i-th feed in the p-th group of ring sections of the kth passage, the value of the rotation frequency of the spindle on the first ring section of the first group of ring sections; number of grunt. ring sections; serial number of the passage.

P ,

q k

Compiled by V.Zolotev Editor L.Gratillo Tehred L. Serdyukova Proofreader S.Shekmar.

Order 771/13

Circulation 831

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

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Claims (1)

Claim A method of testing a cutting tool for wear resistance, including piercing to a specified blunting criterion with a continuous increase in cutting speed in one or more passes from the center to the periphery of the end surface of a cylindrical sample with a central hole, 1463393 characterized in that, in order to expand the range of investigated feeds and reduce the laboriousness of the process, the end surface is divided into groups of annular sections, setting their number in each group equal to the number of investigated feeds, and the values of the diameters of the circles of the annular sections, the values of the studied feeds and spindle speeds are set according to the dependences d,> ^s . ^s L,., 3- ((p- <) - the inner diameter of the i-ro ’rings in the r-th group of annular sections; - internal diameter of the sample; , - proportionality coefficient (for universal machines - the denominator of a number of spindle speeds); - the number of investigated innings; - serial number of the group of annular sections of any passage; - serial number of the feed in the investigated series of feeds; - the value of the feed rate on the i-th annular section of any group of annular sections; - value ⁴ of the feed rate on the first annular section of any group of annular sections; - the value of the frequency of rotation of the spindle on the i-th feed in the r-th group of annular sections of the k-th passage; - the value of the spindle speed on the first annular section of the first group of annular sections; - the number of groups of annular sections; - serial number of the passage. ⁿ ipk The sequence number of the passage to • 1 2 • 3 The sequence number of the group p 2 1 2 1 2 The serial number of the ring section 1 2 3 4 1 2 3 4 1 2 3 4 Serial Number Feed i 1 / 2 1 2 1 2 1 2 1 2 1 2 The diameters of the circles of the annular sections interior a. d, q> d, q> * d, 4> ’ d. d, cp d, Cf ² d d, Cf d ₍ cp ² d, q> ³ .outer d, q> d "1p ² d, 4> ’ d, cf d, cp d, cp ² d, cp ^? d,?. d, cf d, q> ² W d, q> ⁴ Innings s s δ, φ ¹ S s <4 ² s δ, φ ² S S.cf V S, q> ² Rotation frequency η. n n η, ψ n, q> ⁿ W W n, q> ^} η, φ ² Speed initial nd, η, ϊδδδ ^- ” nd, n _t cp ϊδδδ ”” 1000 ηά, η, ςρ ’ϊδδδ ndvn, <f ⁴ ϊδδδ ”” ” nd, n, q> ^? ϊδδδ ^- cutting the ultimate nd, njC £ ΐδδδ nd, n, tp ² 1000 nd, n, Wed ³ ϊδδδ nd, η, ιρ ⁴ ϊδδδ nd, n, cp ^s ϊδδδ nd _L n, (p ^s ϊδοδ