The cutter materials and their contrast

This list includes eight cutter materials and their contrast as below:

1. Mono Diamond)
2. CO PCD
3. Si PCD
4. PCBN
5. Si3N4
6. SiC
7. WC
8. Steel

The cutter materials and their contrast
material		Mono Diamond	CO PCD	si PCD	PCBN	Si3N4	SiC	WC	Steel
properties
Density	g/cm3	3.52	3.8~4.10	3.4	4~4.20	3.2	3	15	7.8
Knoop Hadrness										kg/mm2	6000~9000	5000~8000	5000	2700~3200	1800	2200	1500	560
Toughuess	Mpam-2	3.4	6.1~8.9	6.9	4.1~7.2	6.4	4	11	46
Compression Strength										Mpa	2000	7700	4200	3800	6800	7000	5400	1850
Tensile strength	Mpa	2600	1300	600	500	470	400	1100	1760
Thermal Expansion										10-6/°C	0.8~4.8	1.5~3.8	3.8	3.5~4.2	3.5	3.8	4.3~5.6	11.2~14.3
Thermal Conductivity	w/mk	600~1200	560	120	150	30	40	80	50
Friction											0.05~0.10	0.1	0.1	0.1	0.2	0.2	0.2	0.8

 

The cutting tool for hardening material above HRC50

There are higher requirements and more difficulties for many hardened molds. Hence general carbide cutters cannot reach such request of accuracy. Therefore, it should pay more attention to selection of cutting tools for hardened material.

Since hardening material which HRC is above 50, with higher hardness, the carbide cutter is difficult to meet the processing requirements, it will cause badly wear even break after CNC machining for about ten minutes. General carbide cutters cannot reach the request accuracy because the hardened mold is with higher requirement and difficulty.

Some points for choosing cutters for machining hardened materials as below:

1. Select super micro grain carbide rod and design high rigid tool body to ensure toughness and rigidity of the tool.
2. Select the blade the design of the large helix angle ranging from sub-and four-blade design so that the cutters may reach radial beating with heavy cutting within high-speed and high hardness cutting.
3. Choose carbide cutter with new crystal coating. PVD coating almost cannot be used in high hardness cutting.. the crystal coating may solve it basically about the high temperature / acid resistance / wear / and longer tool life.
4. Cooperate with the powerful tool companies to get their further technical supports and tool configuration, reducing the procurement chain and purchasing costs.

Good carbide cutters with high rigidity of the tool body and new type coating may get high efficiency, precision, and longer tool life. From pre-hardened steel to hardened steel, during high-speed, and high efficient processing; from rough to high precision machining, to achieve a long life; high precision; high quality processing makes it is easier to proceed high-speed and high rigid machining.

Article reference source : NewMaker

Bewise Inc., being a professional manufacturer of various cutting tools, is endeavoring to make excellent products. We are very experienced in custom-made tools, and good at solving customers’ problems when they meet difficulties and troubles. Through everlasting research and practices, we understand thoroughly about different materials of cutters and cutting tools.

BW’s popular products for tool series including circular saw, carbide cutting tool, saw blade, wood saw blade, special tool,side milling cutter, …etc; For machines we have spiral tube cooler, cutter grinder, and the latest design and advanced powder forming machine / pelletizer. Bewise is a superior manufacturer and supplier of cutter production and machinery industry.

 

How to choose woodworking cutters?–part2

Selection of woodworking cutters

1. identify the main technical parameters of the cutter

   Main parameters:outer diameter, machining thickness, and the center diameter.

   Other technical parameters: number of teeth, the direction of rotation, rotation speed, feed rate, clamping way, and cutter material.

2. Choose the structure type of cutter

   According the request and characteristics of cutting object, and consideration from both the technical and economic aspects, select the whole cutters or welding cutters, assembly cutters, and combination cutter.

3. The choice of the cutter rotation direction

   Cutter rotation direction is determined in accordance with the direction of rotation of the processing machinery spindle and the tool axis and the feed of the work piece relative position of the whole cutter, or assembling cutter, the inclination of the cutting blade relative to cutter radius determines the rotation of the cutter direction.

4. Selection of cutting amount of end mills
   Cutting amount of end mills are including cutting speed, feed speed of work material, and depth of milling. Cutting speed depends on the rpm and the radius of the end mills .. feed rate depends on the requirements of cutting surface .. the surface roughness of work material largely depends on the feed rate per tooth during cutting process, too much feed will cause too rough surface of work piece; too small feed will cause burnt phenomenon on the surface, so the feed rate must be appropriate.
5. Operation stability of end mills

   The stability of the cutter operation is to ensure that the basis of the machining accuracy and surface quality .. including two aspects: one is cutter excited vibration in machining due to external forces; the other is that cutter happens deformation by external forces.

6. Safety of milling process
   The safety of the milling cutter includes the limitation of rotation speed, the limitation of chip thickness, height restrictions of molding cutter contour and the thickness of assembly cutter, and stretched limit.

   Cutting timber is characterized by high speed cutting, the rotation speed of the milling cutters mostly above 3000 rpm. High speed cutting for timber brings high productivity and smooth surface .., it also brings a series of security problems. Therefore, when the spindle speed up to 9000 rpm, besides the cutter which diameter smaller than 16mm, it should prohibit to use assembly cutters and do strict testing and inspection for welding cutter.
   It is necessary to limit chip thickness for avoiding overload of cutters.
   For end mills, the clamping method, cutter height, and thickness of work piece are with close relationship. When you ensure the thickness of work piece, mill diameter, and center diameter, the height of cutter reflects its own strength, stiffness, and capacity of cutting resistance. The height must be limited to ensure the safety of cutter usage.
   The design point of welding end mills is clamping problem. No matter the body is cylindrical or disc-type, the blade clamp form must be guaranteed to provide sufficient clamping force to resist rotation centrifugal force .

Reference sources – China Timber Net

 

航空材料與加工原則

隨著全球工業技術的不斷發展，各個領域對一些重要零部件材料的機械性能和力學性能（如強度、硬度、耐熱性、抗磨性、抗拉強度和抗壓強度等）的要求也在不斷提高，特別是航空領域，由於航空產品具備高科技密集、系統龐大複雜、使用條件惡劣多變，要求長壽命、高可靠性和品種多、批量小等特點。對金屬切削刀具及技術提出了更高的要求，難加工材料在人類各個領域的應用越來越廣泛。

航空材料特點：

• 種類、品種、規格多
• 高的比強度（σｂ/ρ）和高的比剛度（Ｅ/ρ）
• 高溫合金是航空材料極其重要的組成部分
• 質量要求高
• 抗疲勞性能是航空材料的另一個突出特點
• 成本高、價格貴

飛機材料：

難加工材料，如鎳基高溫合金、鈦合金、高強度結構鋼被現代航空產品大量採用，這些材料強度大、硬度高，耐衝擊、加工中容易硬化，切削溫度高、刀具磨損嚴重，屬難加工材料。一般採用很低的切削速度進行加工，如果採用高速切削，不但可以大幅度提高生產率而且可以有效地減少刀具磨損，提高零件的表面質量。

隨著航空發動機發展，各種材料再發動機中的用量不斷變化。

難切削材質切削加工原則：

航空難加工材料有高溫合金、鈦合金、超高強度鋼、複合材料等。航空難加工材料加工的最突出問題是刀具磨損問題，直接影響加工效率和成本；此外加工質量也經常成為瓶頸。

難加工材料的有效加工：

• 優選刀具材料：高性能高速鋼、新型硬質合金、塗層刀具、陶瓷刀具、CBN刀具和金剛石刀具…
• 選擇合適的刀具幾何參數
• 採用適當的冷卻潤滑條件
• 採用優化的加工參數
• 合理設計刀具結構及刀具幾何參數
• 改善切削條件
• 低溫切削技術

資料來源：網路彙整

碧威為專業的刀具,銑刀,鎢鋼,切削刀具製造商，致力於製造優秀的產品，在客製化刀具方面的經驗十分豐富，並擅於幫助客戶解決各式各樣之刀具切削面臨之問題，對各種刀具材質切削刀具鍍模都非常瞭解透徹，可選用常見的鎢鋼及高速鋼或是近來詢問度極高的鑽石刀具。

碧威銑刀熱門產品為圓鋸片、鎢鋼刀、鋸片、木工鋸片、鎢鋼刀具及側銑刀。

機械類則有對刀具加工非常有幫助的冷風槍、渦流管槍，並有最新設計和技術的粉末成型機。

碧威是在刀具製造及機械工具業界中具有足夠水準的製造供應商!