Precision Automatic Lathe

 

 

 

Machine features 

 

The body of the slant bed precision automatic lathe  is imitated by the computer, the structural deformation is reduced to a minimum, and the rigidity is sufficient to absorb the resonance so that can get the best machined surface.

30 ° slant of the bed, with chip removal smooth, high precision.

Pro / E analysis, structural strengtheningEach machine has been Pro / E analysis, guaranteedEach machine gets enough rigidity

 

Machine parameter 

 

Specification	Parameter	Unit
Maximum turning diameter on the bed	580	㎜
Max turning diameter	460	mm
Maximum machining diameter on the pallet	300	㎜
Maximum processing length	420	㎜
Spindle rotation range	100～4000	rpm
main motor power	11	KW
The maximum number of knives in the tool holder	12	T
X-axis travel/Z-axis travel	230/450	㎜
X-axis/Z-axis minimum movement amount	0.001/0.001	㎜
X-axis/Z-axis rapid traverse speed	18/18	m/min
Tailstock sleeve model	5#	MT
Tailstock sleeve stroke	100	mm
X-axis/Z-axis repeatability	≤0.003/0.004	㎜
surface roughness	≤0.63	um
Spindle through diameter	Φ52	㎜
Bed slope angle	30	
Dimensions (length X width X height)	2840*1650*1670	㎜
Machine net weight	5000	kg

 

What is the best speed for CNC lathe machine to turn external thread? do you know

 

When machining threads with precision automatic lathe, due to the change of the transmission chain, in principle, its speed should only be able to ensure that the tool is displaced by one pitch along the main feed axis (mostly the Z axis) when the spindle rotates one revolution, and should not be restricted. . However, when CNC lathes process threads, they will be affected by the following aspects:

1) The pitch (lead) value commanded in the thread processing block is equivalent to the feed rate F represented by the feed amount (mm/r). If the spindle speed of the machine tool is selected too high, the converted feed rate will be The speed (mm/min) must greatly exceed the normal value;

2) The tool will be constrained by the servo drive system’s up/down frequency and the interpolation operation speed of the CNC device at the beginning/end of its displacement. Because the up/down frequency characteristics cannot meet the processing needs, etc., it may be caused by the main feed The "advance" and "lag" generated by the movement caused the pitch of some threads to fail to meet the requirements;

3) Thread turning must be realized through the synchronous operation function of the spindle, that is, turning thread requires a spindle pulse generator (encoder). When the spindle speed is selected too high, the positioning pulse sent by the encoder (that is, a reference pulse signal sent by the spindle every revolution) may be lost due to "overshoot" (especially when the quality of the encoder is unstable). Causes the thread of the workpiece to be chaotically buckled.

Therefore, when threading, the determination of the spindle speed should follow the following principles:

1) In the case of ensuring production efficiency and normal cutting, it is advisable to choose a lower spindle speed;

2) When the lead-in length δ1 and the cut-out length δ2 (as shown in the figure) in the thread processing program segment are relatively sufficient, that is, when the thread feed distance exceeds the length of the thread specified on the drawing, an appropriately higher spindle can be selected Rotating speed;

3) When the allowable working speed specified by the encoder exceeds the maximum speed of the spindle specified by the machine tool, you can choose a higher spindle speed as possible;

4) Under normal circumstances, the spindle speed (n screw) during threading should be determined according to the calculation formula specified in the machine tool or CNC system manual, and the calculation formula is mostly:

n screw ≤ nyun/L(r/min) where nyun—the maximum working speed allowed by the encoder (r/min);

L—the pitch (or lead, mm) of the workpiece thread.

 

Standard Configurations :

 

Control System : FANUC 0ITF/GSK/SYNTEC/SIEMENS 

(2) cutting water cooling system

(3) fully enclosed shield

(4) work lights

(5) automatic lubrication system

(6) operation indicator

(7) Chuck foot switch

(8) pulse generator (electronic hand wheel MPG)

(9) Tool accessories

A group of soft claws, a group of boring cutter seat , a set of end face knives,

Outer diameter knife set , a group of two-way knife set, knife handle set of a group (8 ~ 25)

(10) movable sheds water tank

(11) 12 tools BMT turret Taiwan SWIFT

(12) hydraulic tail stock

(13) a set of tool boxes

(14) pad

(15) hydraulic system

 

 

How to control and set the maximum speed for G96/G97/G50 cutting speed?

 

 

In fact, the application of G commands may not be worth mentioning in the eyes of the master, because it is too simple, so there is nothing to talk about, but everything is from simple to complex, and even simple is more difficult than complex.

The 3 G commands shared below are useful and ingenious, which will not only improve the processing efficiency, but also save tool costs.

1. Specify the command of the spindle speed (G97)

Refers to the number of revolutions per minute that the machine tool spindle and workpiece rotate. The unit is r/min (rev/minute).

Writing G97 S1000 in the program is to tell the machine tool spindle to rotate 1000 revolutions per minute.

2. Command to specify constant linear speed (G96)

Refers to the surface velocity at a point on the part. The unit is m/min (meter/minute).

It can also be done in the same way, take any point on the outer circle of the part, how long does this point rotate per minute.

For example, G96S100 means that a certain point rotates and moves 100 meters per minute.

Constant linear velocity Vc formula (speed = distance / time):

For example, the following picture:

If G97S1000 r/min

Diameter D1=50mm

Diameter D2=80mm

Then it can be calculated:

Linear velocity Vc at diameter D1=314 m/min

Linear velocity Vc at diameter D2=502 m/min

If the program uses G97 then the line speed will change as the diameter of the part changes.

Similarly, if the constant linear speed command G96 is used in the program, the spindle speed will also change as the diameter of the part changes.

Because the speed n:

3. Command to specify the maximum spindle speed (G50)

Since G96 is used in the program, the spindle speed will increase as the diameter of the part becomes smaller. It can even theoretically become infinitely larger.

Therefore, it is necessary to control the maximum spindle speed command G50.

For example, writing G50 S3000 in the program means that the rotation speed of the spindle does not exceed 3000 revolutions per minute.

 

So how to make good use of these instructions when programming?

 

1. In terms of parts

2. In terms of tools

 

1. In terms of parts

When turning the end face or the tapered surface, if the program uses G97, the linear speed will also change due to the change of the diameter, so that the processed parts will have uneven lines and affect the surface finish of the parts. Therefore, it is recommended to use G96 and G50 to write the program.

 

2. In terms of tools

When turning difficult-to-machine materials, especially during rough machining, the tool is particularly prone to wear, so among the three cutting elements (speed, depth of cut, and line speed), the line speed has the greatest impact on tool wear.

 

During rough machining, the diameter of the part, such as the outer circle of the car, is getting smaller and smaller, and the linear speed is getting higher and higher, which will increase the wear of the tool. In order to reduce tool wear, it is recommended to choose G96 in conjunction with G50 to program.

When you apply instructions, you must choose flexibly in combination with the actual situation of on-site processing to reflect the professional level of programming.

 

 

 

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