Chủ Nhật, 11 tháng 10, 2020

Công Nghệ Chế Tạo Máy | Cutting Data | Troubleshooting Speed/Feed Problems | Best Practice Machining Parameters

Cutting Data | YCK2020

Thông số cắt gọt rất quan trọng trong Gia công cơ khí chính xác.

Bản Thông số cắt gọt này giúp cho các bạn đang học về Công nghệ chế tạo máy thêm nguồn tham khảo.

Hi vọng giúp cho các sinh viên Chế tạo máy và những người hoạt động về Cơ khí chế tạobạn có thể tìm kiếm bài viết này với từ khóa: Machining Parameters,Cutting Data,Mill Cutting Speeds,Corner Radius Tool,Drill Cycles Speed Data,Cutting Feeds,chế tạo máy,Dao Phay Ngon,compabua,Cutting Data,chế tạo máy,

Tables on the following pages provide basic speed, feed and cutting data for some of the materials commonly used for prototypes. Use the tool manufacturer's data instead whenever it is available.

Mill Cutting Speeds (SFM) surface ft/min

Table 3.5: Milling Speed Data (SFM)

Mill Cutting Speeds (SFM) surface ft/min

Material

HSS

Carbide

Aluminum

600

800

Brass

175

175

Delrin

400

800

Polycarbonate

300

500

Stainless Steel (303)

80

300

Steel (4140)

70

350

 

Table 3.6: Drill Cycles Speed Data (SFM)

Drill Cutting Speeds (SFM) surface ft/min

Material

Drilling

C-Sink

Reamer

Tap

Aluminum

300

200

150

100

Brass

120

90

66

100

Delrin

150

100

75

100

Polycarbonate

240

160

120

100

Stainless Steel (303)

50

35

25

35

Steel (4140)

90

60

45

35

 



Never use tools that have been used to machine metal to cut plastic. The sharp edge of the tool will be compromised and cutting performance and finish will suffer. A good practice is to keep two sets of tools: one for plastic and one for metal.

High-speed steel cutters work best for plastics. Carbide cutters work better for aluminum and other metals.

 

Table 3.7: Feed Data (IPR)

Cutting Feeds (IPR) in/rev

Operation

Tool Diameter Range (in)

 

<.125

.125-.25

.25-.5

.5-1.

>1.

Milling

Aluminum

.002

.002

.005

.006

.007

Brass

.001

.002

.002

.004

.005

Delrin

.002

.002

.005

.006

.007

Polycarbonate

.001

.003

.006

.008

.009

Stainless Steel (303)

.0005

.001

.002

.003

.004

Steel (4140)

.0005

.0005

.001

.002

.003

 

Drilling

.002

.004

.005

.010

.015

 

Reaming

.005

.007

.009

.012

.015

Best Practice Machining Parameters

Best practice machining parameters for prototype and short-production milling are different than for mass production. Production machining is obsessed with minimizing run time and maximizing tool life because even small improvements per part can result in significant cost savings.

Prototype and short run production seeks to maximize reliability. Obviously, it does not make sense to risk breaking a tool or scrapping a part trying to save a few seconds if only making a few parts.

Tables 3.8 and 3.9 on the following pages list recommended machining parameters for prototypes. The values are relatively conservative and work well for materials and tool types listed on the previous pages.

For materials or tools not listed, consult cutting data from the tool manufacturer.

Table 3.8: Machining Parameters

Recommended Machining Parameters

Operation

Parameter

Value

All

Clearance Height

1.0 inch

All

Feed Height

.1 inches

All

Rapid Height

As needed to clear clamps and fixtures

Mill (Roughing)

Stepover (XY)

50-80% of tool dia.

Mill (Roughing)

Stepdown (Z)

25-50% of tool dia.

Drill

Peck Increment

.05 inches

Spot Drill

Dwell

.5 seconds

 

Table 3.9: Stock Allowances

Stock Finish Allowances (inches)

Operation

Tool Diameter Range (in)

 

<.125

.125-.25

.25-.5

.5-1.

>1.

Milling (XY)

.001

.005

.015

.020

.020

Milling (Z)

.001

.002

.005

.005

.005

Reaming

.005

.010

.012

.020

.030

 

Troubleshooting Speed/Feed Problems

Do not make the mistake of thinking that the only option when encountering a machining problem is to reduce feed rate. Sometimes that is the worst thing to do and decreasing speed and increasing feed may be a better option.

Be methodical. When a problem occurs, stop. Analyze what is happening, draw on all available resources, and then devise a solution to correct the problem. The Machinery's Handbook (Industrial Press Inc, 2008, New York, NY, ISBN: 978-8311-2800-5) contains extensive information about diagnosing and correcting cutting tool problems. This book is an essential reference for anyone using machine tools.


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