欧美人妻精品一区二区三区99,中文字幕日韩精品内射,精品国产综合成人亚洲区,久久香蕉国产线熟妇人妻

On this week we’ll discuss the effect of helical angle on the cutting performance of a milling cutter in meetyou weekly.
for illumination helical angle end milling cutter
Abb.1

As we all know, there are two basic types of cutting edge shapes for Schaftfr?ser: straight shape and helicalshape, among which the helicaltype is more widely applied because it can lead to faster, stabler, and more effective cutting than straight type. You can see the general 2 types of helicaledge in fig.1. Left helicaltype is mainly used for high precision milling, such as processing mobile phone keys , film switch panel, LCD panel, and acrylic lenses. The right helicalmilling cutter conforms to the spindle rotation of miller, and it is convenient to unload at most chucks. Thus, the right helicalend milling cutter is the most widely used and the common right helicalangle is usually 30° ~ 45°.

In our general opinion, The helical angle?U of end milling cutter?corresponds to the inclination?angle?λs, but the introduction and discussion of the dip angle?is mainly about turning processing.?However, there are many differences between milling and turning.?It is impossible to apply all?knowledge about?edge inclination?angle to the milling of end mills.

For milling, it is roughly known that a larger spiral angle increases the number of teeth working at same time, reducing impact and increases smoothness during milling, and making the end mill edges sharp. Except for that, ?what kind of impact will the size of helical angle have on end milling cutters? Tool and edge angles are interrelated and impact for each other. Let’s take a experiment to get some data for further to-know of this subject.

 

A experiment on groove milling with 2 edge helicalend milling cutter

The experiment was carried out on a vertical machining center. A 2-edge end mill with diameters of φ12mm and different helical angles was used to mill a 12mm× 12mm slot with width × height. The vertical error (ΔX) of both sides of the groove was measured based on the bottom surface of the groove after machining. The influence of spiral angle on the machining accuracy was evaluated by comparing the error values.

The work piece?to be processed?is carbon steel with hardness of 28HRC. The cutting parameters of each tool in the experiment are as follows: feed speed 50mm /min, cutting speed 29m /min, and cutting depth 12mm. Oil coolant is used. Experimental results are shown in the figure 2.

 

Influence of Helical Angle of End Milling Cutter on Cutting Performance 1
fig.2 experiment data

From the experimental results, we can see that:

( 1) Overcut always occurs on the up?milling side?of work piece.?On the contrary, the missing cut?phenomenon?always appears?on the down?milling side, and the maximum point of overcut and missing cut is at the end milling cutter extension farthest.?This point accords with the deformation pattern?of the tool and the tool extension length during up?milling and down?milling.

( 2) As the spiral angle of the end milling cutter is less than 30 °, the perpendicularity error value will increase with the increase of the helical angle, whether on the forward milling side or on the reverse milling side.

When the helical?angle?is greater than 40 °, it will decrease with the increase of the helical?angle. Therefore, it can be considered that when the end milling cutter has a smaller?helical?angle?or a larger?helical?angle, the shape accuracy of its groove milling is high, Although it seems a contradiction.

( 3) From the perspective of machining accuracy, when the helical?angle?is 0, the cutting edge is straight and the accuracy is the highest. However, from the basic characteristics of the helical?angle?of the end mill, the end mill will completely present intermittent cutting in this case. This kind of machining with large cutting impact requires high manufacturing accuracy of the tool itself.

 

A experiment of side milling with helical angle and 4-edge end milling cutter

The side of the workpiece is milled on a vertical machining center with a 4-edge end milling cutter with a helical angle?of 30 ° and 55 °. We compare the influence of the change of the two end milling cutters with the cutting width (radial feed) on the machining accuracy. When the diameter of the end milling cutter is 25mm, the 45 # steel with the hardness of 94HRB shall be cut by the straight milling method and dry cutting. The cutting parameters are feed rate of 100 mm/min, cutting speed of 26 mm/min and cutting depth of 38 mm The measured perpendicularity error, flatness error and surface roughness after machining are shown in Figure 3.

Influence of Helical Angle of End Milling Cutter on Cutting Performance 2
fig.3 experiment data

It can be seen that when the cutting width is not particularly large, the machining accuracy of the 55 ° large helical angle?end mill is higher than that of the 30 ° helical angle?end mill. This is consistent with the groove milling experiment results in Figure 2. After analyzing the reasons, it can be considered that this is because when the cutting width is small, the actual rake angle?of the large helical angle?end mill is large, which makes the edge sharp and reduces the tangential cutting resistance, energy consumption and tool deformation.

 

Induction of helical angle characteristics

(1) Spiral angle and cutting resistance: tangential cutting resistance decreases with the increase of helical angle, and axial cutting resistance increases with the increase of helical angle.

(2) Spiral angle and rake angle: the increase of helical angle makes the actual rake angle of end milling cutter increase and the edge become sharper.

(3) Spiral angle and machined surface precision: Generally, the perpendicularity and flatness tolerance value of the machined surface increases with the increase of the helical angle, but when the helical angle is greater than 40 °, it decreases with the increase of the helical angle.

(4) Spiral angle and tool life: the wear speed of the circumferential edge belt is basically proportional to the helicalangle.On the other hand, when the helical angle is very small, slight tool wear will also significantly reduce the cutting performance of the tool, cause vibration, and make the tool unable to continue to use. When the helical angle is too large, the rigidity of the tool will become poor, and the service life will be reduced.

(5) Spiral angle and material to be cut: when machining soft materials with low hardness, use large helicalangle to increase the front angle and improve the sharpness of the cutting edge.When machining hard materials with high hardness, small helical angle is used to reduce the front angle and improve the rigidity of the cutting edge

 

Conclusion about our research on end mills with helical angle

Helical angle is one of the main parameters of helical end milling cutter. The change of Spiral angle has a great impact on the cutting performance of the cutter. With the development of CNC machining technology and flexible manufacturing technology, it is possible to change the size of helical angle in the tool manufacturing process. If we study further the various effects of spiral angle size on the cutting performance of helical end milling cutter, when manufacturing and selecting helical edge end milling cutters, we need to consider the performance and processing accuracy of the processed material, processing efficiency, tool material and tool life, which will undoubtedly play an important role in promoting efficient and high-precision milling.

 

Schreibe einen Kommentar

Deine E-Mail-Adresse wird nicht ver?ffentlicht. Erforderliche Felder sind mit * markiert.

国产欧美一区二区三区嗯嗯-欧美一区二区日本国产激情| 亚洲欧美一区二区中文-台湾中文综合网妹子网| 中文字幕社区电影成人-欧美精美视频一区二区三区| 亚洲区欧美区在线视频-亚洲碰碰人人AV熟女天堂| 麻豆久久国产精品亚洲-日本理论中文字幕在线视频| 久久精品国产亚洲av湖南-竹菊精品一区二区三区| 国产精品久久久精品一区-99久久免费精品国产男女性高好| 黄色美女网站大全中文字幕-欧美韩国日本一区二区| 免费午夜福利视频在线观看-亚洲成人日韩欧美伊人一区| 97一区二区三区在线-欧美护士性极品hd4k| 亚洲精品蜜桃在线观看-国产欧美日韩在线观看精品观看| 欧美亚洲另类久久久精品-国产精品一区二区亚洲推荐| 亚洲欧美日韩国产一区二区三区-国产欧美日韩一区二区免费| 中文字幕人妻少妇第一页-隔壁的女孩在线看中文字幕| 亚洲精品蜜桃在线观看-国产欧美日韩在线观看精品观看| 日韩精品一区二区三区粉嫩av-欧美亚洲国产中文字幕| 人妻少妇无乱码中文字幕-人成免费视频一区二区| 国产成人精品免费视频大全办公室-亚洲欧美日本综合在线| 十九禁止观看无码视频-亚洲国产激情福利专区| 国产成人高清精品免费5388-好妞色妞在线视频播放| 小12萝自慰喷水亚洲网站-chinese偷拍一区二区三区| 国产黄污网站在线观看-成人av电影中文字幕| 亚洲黑人欧美一区二区三区-亚洲一区二区三区免费视频播放| 一级小黄片在线免费看-亚洲欧美午夜情伊人888| 天天干天天天天天天天-亚洲综合av在线三区| 熟女熟妇伦51788-国产av在线播放一区二区三区| 白嫩美女娇喘呻吟高潮-久久一区二区三区日产精品| 女主播啪啪大秀免费观看-精品99午夜福利影院| 国产人妻人伦精品日本-国产98超碰人人做人人爱| av噜噜国产在线观看-欧美视频亚洲视频一区二区三区| 一级小黄片在线免费看-亚洲欧美午夜情伊人888| 丝袜高跟熟女视频国产-熟女少妇亚洲一区二区| 俄罗斯胖老太太黄色特级片-国产精品黑丝美腿美臀| 国产精品久久久精品一区-99久久免费精品国产男女性高好| 国产精品久久久精品一区-99久久免费精品国产男女性高好| 少妇人妻无码久久久久久-综合图片亚洲网友自拍| 黑丝av少妇精品久久久久久久-中文字幕久久久人妻无码| 久久精品亚洲国产av久-国产精品视频一区二区免费| 久久免费观看归女高潮特黄-黄色av一本二本在线观看| 黑丝av少妇精品久久久久久久-中文字幕久久久人妻无码| 亚洲精品在线观看一二三区-在线观看国产中文字幕视频|