How to Determine the Cutting Quantity and Feed Rate in CNC Lathe Programming

When programming, the programmer must determine the amount of cutting for each process. When selecting the cutting amount, it is necessary to fully consider various factors that affect the cutting, correctly select the cutting conditions, and reasonably determine the cutting amount, which can effectively improve the machining quality and output. Factors affecting cutting conditions include: rigidity of machine tools, tools, tools and workpieces; cutting speed, cutting depth, cutting feed rate; workpiece accuracy and surface roughness; tool life expectancy and maximum productivity; type of cutting fluid, cooling method; Workpiece material hardness and heat treatment conditions; number of workpieces; machine tool life.

Among the above factors, cutting speed, cutting depth, and cutting feed rate are the main factors.

The speed of cutting directly affects the cutting efficiency. If the cutting speed is too small, the cutting time will be longer and the tool will not be able to perform its function. If the cutting speed is too fast, although the cutting time can be shortened, the tool will easily generate high heat and the tool life will be affected. There are many factors that determine cutting speed. To sum up, there are:

(1) Tool material. Different tool materials, the maximum allowable cutting speed is also different. High-speed steel cutting tool cutting speed is less than 50m/min, carbide cutting tool high-temperature cutting speed of up to 100m/min, ceramic cutting tool high-temperature cutting speed up to 1000m/min.

(2) Workpiece material. The hardness of the workpiece material will affect the cutting speed of the tool. When the same tool is used to process hard materials, the cutting speed should be reduced. When machining softer materials, the cutting speed can be increased.

(3) Tool life. If the tool usage time (life) is long, a lower cutting speed should be used. Conversely, higher cutting speeds can be used.

(4) Depth of cut and feed. Depth of cutting and the amount of feed, cutting resistance is also large, cutting heat will increase, so the cutting speed should be reduced.

(5) The shape of the tool. The shape of the cutter, the size of the angle, and the sharpness of the cutting edge all affect the selection of the cutting speed.

(6) Coolant use. A machine with good rigidity and high precision can increase the cutting speed; otherwise, it needs to reduce the cutting speed.

Of the above factors that affect cutting speed, the influence of the tool material is the most important.

The cutting depth is mainly conditioned by the rigidity of the machine tool. If the rigidity of the machine tool allows, the cutting depth should be as large as possible. If it is not limited by the machining accuracy, the cutting depth can be equal to the machining allowance of the part. This will reduce the number of passes.

The spindle speed is determined based on the allowable cutting speed of the machine and the tool. It can be selected by calculation method or look-up table method.

Feed rate f (mm/r) or feed speed F (mm/min) is selected according to the part's machining accuracy, surface roughness, tool and workpiece material. The maximum feed rate is limited by the stiffness of the machine and the feed drive and numerical control system.

When selecting the cutting amount, the programmer must select the cutting amount suitable for the characteristics of the machine tool and the best durability of the tool according to the requirements of the machine tool specification and the tool durability. Of course, analogy can also be used to determine the amount of cutting. Regardless of the method used to select the cutting amount, the durability of the tool must be ensured to complete the machining of one part, or the durability of the tool is not less than one work shift, and the minimum can not be less than half the shift time.

Gantry Flame CNC Cutting Machine

Advantages and features:
Automatic igniting and tempering control, high efficient and quick. Can be linear single, double - sided a molding groove cutting.
Brand: Buluoer intelligent
Other name: Gantry flame plasma CNC cutting machine
Cutting mode: flame cutting, Plasma cutting
Suit material: carbon steel, manganese plate, galvanized plate, stainless steel, copper steel, aluminium plate etc. metal plate materials.
Product describe:
This CNC equipment is aimed at metal plate materials baiting, not only the appearance of atmospheric but also stable operating, high working efficiency, long service life and it can be achieved cutting all kinds of design graphic. Widely used in various machine building industry of metal sheet cutting.
Product features:
Bilateral drive, high transmission accuracy, operating is stability.
Frame aging treatment, stable structure and non-deformation.
Can remote operation, convenient and efficiency, save labour.
Automatic temper control, safety and efficiency.
Full-automatic StarCAM/ FastCAM graphical editing software, simple nesting.
Flame/plasma dual-purpose cutting system, easy to operate and wide application range.
System has self-compensating, automatic positioning, automatic height-adjustment, break-point memory and automatic recovery function.
Cutting size customization, flame plasma sub-cutting options.

Flame plasma CNC cutting machine

Basic Equipment

No.	Name	Distribution	Unit	Quantity	Remark
1	Type specification	BLDH4080	set	1	Beam annealing
2	Drive mode	double-drive	set	2	Panasonic servo
3	Drive reducer	AEVELE	set	2	Taiwan
4	CNC	F2300TB	set	1	Shanghai Jiaoda
5	FASTCAM	Fast CAM Chinese version	set	1	Guoyou
6	Flame cutting torch	Wuxi Xiangzheng	set	1	Guoyou
7	Plasma power	Chengdu Huayuan LGK200	set	1	Huayuan
8	Arc voltage regulator	Shanghai Jiaoda	set	1	system-provided
9	Automatic ignite device	Wuxi Xiangzheng	set	1	Guoyou
10	Precision track	24 kg	m	8*2	Wuxi
11	Precision rack	Straight tooth	m	6*2	Wuxi
12	Pulley	Nylon chain	set	1
13	Lift body	2K2M	piece	2

Technical requriments

No.	Name	Distribution	Remark
1	Width of machine tool	4000
2	Effective cutting wideth	3100
3	Track gauge	3710
4	Idle speed	0~8000 mm
5	Flame cutting thickness	5~200 mm
6	Plasma punch cutting thickness	25mm	user demand
	Plasma max. Cutting thickness	45mm	user demand
7	Effective length	6500 mm
8	Cutting torch journey	≤150 mm
9	Accurancy	± 0.5 mm
10	Track length	8m
11	Input power	AC220V/380V 50HZ
12	automatic height-adjustment	Jiaoda arc voltage height-adjustment
13	Cutting material	Stainless steel plate, carbon steel plate

Cutting samples

Flame Cutting Machine,Plasma Cutting Equipment,Copper Cnc Cutting Machine,Cnc Plasma Slab Cutting Machine

Shandong Buluoer Intelligent Technology Co., Ltd. , https://www.buluoercuttingmachines.com