Precision of job of numerical control lathe examines

 To numerical control lathe, ben Shugen occupies GB/T 16462—-1996 ” precision of numerical control center lathe examines ” national level undertakes be elaboratinged relevantly.

  (one) , circularity: Stand by what main shaft axis carries to examine the radius of the spare parts changes; Cutting machines diametical consistency: Examine the change between the each clitellum diameter of the spare parts.

1, type of check proved recipe

Fine vehicle clip holds the test specimen of round lean on a stick on workpiece clamping apparatus of the standard. A labour of installation of odd blade lathe tool in circumgyrate tool carrier go up.

Examine speed of deepness of the type of the material of the spare parts and cutting tool and appearance, feed, cutting, cutting all is set by the manufactory, but the relevant provision that should accord with country or occupation standard.

2, diagram

 

                   L=0.5 is the biggest turning diameter or 2/3 are the biggest turning journey.

                        Limits 1: Most greatly 250

                        Limits 2: Most greatly 500

                               Dmin=0.3L

Graph 5-8 circularity and the consistency that cutting machines a diameter brief examine graph

3, allow is poor

Limits 1: Most greatly the circumstance of 250:

Circularity: 0.003

Cutting machines diametical consistency: It is on 300 length 0.02

Limits 2: Most greatly the circumstance of 500:

Circularity: 0.005

Cutting machines diametical consistency: It is on 300 length 0.03

The poor value between photograph adjacent clitellum should not exceed 75% what poor value measures between two upright clitellum.

(2) , the flatness of fine vehicle end panel

1, type of check proved recipe

Fine vehicle clip supports the test specimen end panel on workpiece clamping apparatus of the standard. A labour of installation of odd blade lathe tool on circumgyrate tool carrier go up.

Examine speed of deepness of the type of the material of the spare parts and cutting tool and appearance, feed, cutting, cutting all is set by the manufactory, but the relevant provision that should accord with country or occupation standard.

2, diagram

                             Dmin=0.5 is the biggest turning diameter

The flatness of end panel of vehicle of graph 5-9 fine examines graph

3, allow is poor

0.025 allow are on 300 diameters sunken

(3) , pitch precision

1,      type of check proved recipe

With whorl of lathe tool of an odd blade. V whorl appearance: The pitch of whorl should not exceed guide screw pitch.

Deepness of the form of the cutting tool of pitch along with of the material of test specimen, diameter, whorl and appearance, feed, cutting and cutting speed all are set by the manufactory, but the relevant provision that should accord with country or occupation standard.

Note:

(1) , whorl surface should cave glossily or moire.

(2) , external diameter is 50, long for 75, pitch not typical test specimen can satisfy great majority not to have guide screw machine tool commonly.

2, diagram

                      Lmin = 75        Shank diameter of D ≈ silk

Precision of graph 5-10 pitch examines graph

3, allow is poor

Random 50 measure length to go up for 0.01.

(4) , the deviation of the turning outline that is in in the changeover dot of each axis and academic outline

1,      type of check proved recipe

The rough sketch of test specimen of turning of lathe tool of an odd blade is used below digital control.

Deepness of the form of the cutting tool of pitch along with of the material of test specimen, diameter, whorl and appearance, feed, cutting and cutting speed all are set by the manufactory, but the relevant provision that should accord with country or occupation standard.

2,      diagram

To the axis kind lathe sees graph 5-11 spindle kind the deviation graph of lathe outline.

Shows measure suits only at limits 2: Most greatly 500.

To limits 1: Most greatly the dimension of 250 machine tools is OK by manufactory scale down.

Graph 5-11 axis kind the deviation of lathe outline examines graph

To dish kind lathe sees graph 5-12 dish the deviation graph of kind of lathe outline.

 

Graph 5-12 dish the deviation of kind of lathe outline examines graph

3,      allow is poor

Limits 1: Most greatly the circumstance of 250: 0.03

Limits 2: Most greatly the circumstance of 500: 0.045

(5) , error of the dimension of the outline change of fiducial radius, diameter, circularity

1, type of check proved recipe

With the program 1 or program 2 turning a test specimen.

Program 1:

It is a block with 15 ° from 0 ° ~ 105 ° (namely 7 block) section turning is spherical, need not compensation of radius of circular arc of point of a knife.

Program 2:

Use a program only (105 ° of 1 ° ~ ) turning is spherical, need not compensation of radius of circular arc of point of a knife.

Working procedure:

(1) , the mental allowance that expects in the embryo before finish machining is 0.13.

(2) , go to finish machining of test specimen NO.1 requirement measure.

(3) , do not adjust a machine tool, go to test specimen NO.2 and NO.3 finish machining requirement measure.

2, diagram

Error of the dimension of the outline change of graph 5-13 fiducial radius, diameter, circularity examines graph

3, allow is poor

Dimension

Limits 1

Limits 2

﹤ 100

0.008

,

﹤ 150

0.010

,

﹤ 250

0.015

,

﹤ 350

,

0.020

﹤ 500

,

0.025

﹤ 750

,

0.010

0.003

0.035

0.020

0.005

Note:

(1) , the exterior surface roughness that test specimen achieves should make a record.

(2) , double what the precision of radius of circular arc of point of a knife must achieve a machine tool to input resolution, and of cutting tool before horn is 0O.

(3) , the data that must use close together, stability (be like aluminium alloy) in order to obtain satisfactory exterior surface roughness.

(4) , the repetition that the comparison that passes these 3 test specimen can get laden condition falls locates precision.