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C 47 A guide to the applications of cemented carbide brazed tips 1 2 3 4 The structure of brazed tips tools should be tough enough Enough toughness shall be guaranteed by the maximum allowable sizes of the tips and by us…

焊接式切削刀具结构应具有足够的刚性

足够的刚性是以最大允许的外形尺寸，以及采用较高强度的钢号和热处理

来保证。

硬质合金刀片应固定牢靠

硬质合金刀片应有足够的固定牢靠程度，它是靠刀槽及焊接质量来保证

的，故要根据刀片形状及刀具几何参数，选择刀片镶槽形状。

在将刀片焊接至刀杆上以前须要对刀片、刀杆进行必要的检查，首先应检

查刀片的支承面不能有严重弯曲。硬质合金焊接面不得有严重渗碳层，同时还

应将硬质合金刀片表面及刀杆镶槽中的污垢进行清除，以保证焊接牢靠。

对焊接用焊料的要求：

为了保证焊接强度，应选择合适的焊料。在焊接过程中，应保证良好的湿

润性和流动性，并排除气泡，使焊料与合金焊接面充分接触，无缺焊现象。

对焊接用熔剂的要求：

建议采用工业硼砂，在使用前应在烘干炉中进行脱水处理，然后进行碾

碎，过筛去除机械夹杂物，待用。

在焊接高钛低钴细颗粒合金及焊接长而薄的合金刀片时，为减少焊接应

力，建议采用厚度为0.2-0.5mm的薄片或网孔径1-2mm的网状补偿垫片进行

焊接。

由于硬质合金刀片脆性较大，对裂纹形成敏感性强，所以刀具在刃磨过

程中应避免过热或急冷，同时还要选择合适粒度和硬度的砂轮及合理的磨削工

艺，避免产生刃磨裂纹，影响刀具使用寿命。

在安装刀具时，刀头伸出刀架的长度应尽量小，否则，容易引起刀具震

动，从而损坏合金片。

刀具使用达到正常磨钝时，必须进行重磨，重磨后的刀具，一定要用油石

对刃口及刀尖圆角进行研磨，这样会提高刀具的使用寿命及安全可靠性。

焊接式硬质合金刀片使用说明

硬质合金焊接刀片

Cemented Carbide Brazed Tips

A guide to the applications of cemented

carbide brazed tips

The structure of brazed tips tools should be tough enough

Enough toughness shall be guaranteed by the maximum allowable sizes of the tips

and by using a rather strong steel grade and heat treatment.

Cemented carbide tips should be strongly fixed securely

The cemented carbide tips should have a secure xation and it is guaranteed by

the Flutes of the tool holders and the quality in welding, so the utes of the tools holders

must be selected based on the shapes and the geometrical parameters of the tips.

Before welding of the tips to the tool holders, a check must be done on the tips And

the tool holders. An initial check must be done to ensure that there is no serious bending

on the support surface of the tips. There shall be no serious carbulization on the welding

surface of the tips and at the same time the contaminants on the surface of the tips and

in the utes of the tools holders must be eliminated to ensure the quality of a secure

welding.

There are requirements for the welding materials

In order to endure the toughness of the welding, a suitable welding material must

be selected. During the welding, good wettability and owability must be guaranteed and

the air bulbs must be got ridden of in order to ensure the sufcient contact of the welding

material and the surface of the tips to be welded leaving nothing to be welded.

There are requirements for the flux in the welding process

It is recommended that industrial borax is to be used. Before the use of the borax, it

should be dewatered in a drying oven and then milled and sieved to get rid of the foreign

objects.

During the welding of cemented carbide tips of ne grain size with high titanium and

low cobalt content and long and thin cemented carbide tips it will be recommended that

compensation shims of a thickness of 0.2-0.5mm or similar shims with holes of l-2mm in

order to reduce the stress in the welding process.

As cemented carbide tips are rather brittle and are most sensitive to the formation

of cracks. excessive heating or rapid cooling must be prevented in the grinding of the

tools and at the same time, grinding wheels with an appropriate grain size and hardness

must be selected and a proper grinding technique to avoid cracks in the grinding of the

edges of the tips and not to affect the lifetime of the tools.

When the tools are installed, the length of the tips outstretching the tools must be

as less as possible, as otherwise the vibration of the tools will occur thus damaging the

cemented carbide tips.

When the tools come to a normal bluntness, they must be reground. The edges

and the radius of the edges must be ground with oilstones after the tools are ground to

increase the lifetime and reliability of the tools.

硬质合金焊接刀片

Cemented Carbide Brazed Tips

参考资料

Reference information

刀具寿命的修正参数

CORRECTION FACTOR FOR THE LIFETIME OF TOOLS

在切削加工中，为了进一步提高刀具的使用寿命，或者提高金属切除率，

可以通过下表对刀具的寿命，及切削速度进行计算和调整：

In order to further increase the lifetime of the tools and the cutting efciency, the lifetime of the

tools and cutting speeds can be calculated & adjusted based on the following table:

工件材料硬度( HB)与切削速度修正系数,如果工件材料的硬度值与表中的

硬度值有差异，那么切削速度应乘以表中的修正系数。

The correcion factor of the hardness of the workpiece(HB)and the cutting speed.If the value

of hardness of the workpiece is differs from he value of hardness in the table, then the cutting

speed should be multiplied by the correction factor.

例如：如果推荐切削速度Vc=214m/min，那么当需保证刀具寿命45分钟时，其计算切削速度为

14x0.72=154m/min

注：当增加进给量时，要根据表中推荐的切削参数应适当降低切削速度。

Example: If the recommended cutting speed is Vc=214mm/min. the cutting speed can be calculated by the

formula 214x0.72=154m/min to ensure a lifetime of 45 minutes for the tool

Note: When the feed is increased. the cutting speed should be suitably decreased as per the

recommended cutting parameters in the table.

刀具寿命（分）

Lifetime of tools(min)

10 15 20 25 30 45 60

校正系数

Correction factor

1.11 1.0 0.93 0.87 0.81 0.72 0.66

ISO 分类

HB -60 -40 -20 0 +20 +40 +60 +80 +100

180 1.44 1.25 1.11 1.0 0.91 0.84 0.77 0.72 0.67

180 1.42 1.24 1.11 1.0 0.91 0.84 0.78 0.73 0.68

200 1.10 1.13 1.06 1.0 0.95 0.90 0.86 0.82 0.79

例如：如用YT14合金刀片切削硬度值HB180的GCr15钢时其切削参数为：Vc=150m/min、f=0.2mm/r、

ap=2.0mm．那么在给定的硬度值HB180与HB200间的差值是+20．此时表中的值正系数是0.91，那么

HB200的调整切削速度应为：150m/minX0.91=136.5m/min.

Example: If inserts of grade YT14 are used to machining GCr15 steel with a hardness of Hb180 & the cutting

parameters are: Vc=150mm. min. f=0.2mm. ap=2.0mm. then difference between the given

hardness value of HB180 and HB200 is +20. The correction factor in the table is 0.91 and the

adjusted cutting speed shall be : 150m/min.x0.91=136.5m/min .