阅读说明：本技术 一种用于铝合金类零件密封槽加工的带螺旋角抗振t型铣刀 (Anti-vibration T-shaped milling cutter with helical angle for machining sealing grooves of aluminum alloy parts ) 是由 吴思旋 王伟 徐斌 王健 金鑫 于 2020-12-09 设计创作，主要内容包括：本发明公开了一种用于铝合金类零件密封槽加工的带螺旋角抗振T型铣刀,通过修磨将刀刃上部磨削去除,仅留有宽度为零件密封槽槽宽的切削刃,形成5刃带螺旋角的T型铣刀,所述螺旋角为5°至8°,所述T型铣刀为无涂层硬质合金T型铣刀。利用本发明的新制T型铣刀加工密封槽后,零件密封槽槽底粗糙度得到明显改善,不仅加工效率得以提升,而且提高了装配一次合格率。(The invention discloses a vibration-proof T-shaped milling cutter with a helical angle for machining a sealing groove of an aluminum alloy part, wherein the upper part of a cutting edge is ground and removed through polishing, only a cutting edge with the width being the width of the groove of the sealing groove of the part is reserved, a T-shaped milling cutter with a helical angle of 5 edges is formed, the helical angle is 5-8 degrees, and the T-shaped milling cutter is an uncoated hard alloy T-shaped milling cutter. After the novel T-shaped milling cutter is used for processing the sealing groove, the roughness of the bottom of the part sealing groove is obviously improved, the processing efficiency is improved, and the one-time qualified rate of assembly is increased.)

1. The utility model provides a take helix angle anti vibration T type milling cutter for processing of aluminum alloy class part seal groove which characterized in that, removes the grinding of cutting edge upper portion through the coping, only leaves the cutting edge of width for part seal groove width, forms 5 edges T type milling cutter of helix angle, the helix angle is 5 to 8.

2. The helical angle anti-vibration T-shaped milling cutter for machining the sealing grooves of the aluminum alloy parts as claimed in claim 1, wherein the T-shaped milling cutter is an uncoated T-shaped milling cutter.

3. The helical angle anti-vibration T-shaped milling cutter for machining the sealing groove of the aluminum alloy part as claimed in claim 1 or 2, wherein the T-shaped milling cutter is a hard alloy T-shaped milling cutter.

4. The anti-vibration T-shaped milling cutter with the spiral angle for machining the sealing grooves of the aluminum alloy parts as claimed in claim 3, wherein the T-shaped milling cutter is provided with an internal cooling channel, the internal cooling channel is connected to the front edge part of the cutter from the center of the cutter handle, and cutting fluid is flushed to a machining part in the cutting process.

5. The anti-vibration T-shaped milling cutter with the helical angle for machining the sealing grooves of the aluminum alloy parts according to claim 1 or 2, wherein the T-shaped milling cutter is provided with an inner cooling channel, the inner cooling channel is connected to a front edge part of a cutter from the center of a cutter handle, and cutting fluid is flushed to a machined part in the cutting process.

6. The helical angle anti-vibration T-shaped milling cutter for machining the sealing groove of the aluminum alloy part as claimed in claim 1, wherein the R angle of the edge of the T-shaped milling cutter is ground according to the R angle of the bottom of the sealing groove of the part.

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a helical-angle anti-vibration T-shaped milling cutter for machining a sealing groove of an aluminum alloy part.

Background

With the development demand of high-tightness structures in the aerospace field on precision machining technology, various precision machining processes are more and more widely applied. The processing quality of the sealing groove of the part is one of important indexes for determining the sealing performance of the whole structure of the part.

Taking an aluminum alloy shell as an example, the sealing structure of the aluminum alloy shell is shown in fig. 1, the interior of the shell is a low-pressure end, the interior connected with other parts is a high-pressure end, the movement of the piston is realized through pressure change, and meanwhile, the sealing of the high-pressure end and the low-pressure end is ensured. The sealed position has 3 grooves, and wherein the groove that width is 3H12 is the high pressure end seal groove, and the groove that width is 4H12 is the low pressure end seal groove, and the groove that width is 3 is the oil return tank, does not play sealed effect. The design dictates that the high pressure seal slot allows leakage, and leaked oil enters the interior of the housing through the oil return slot. Therefore, whether the sealing requirement of the shell can be met depends on the processing quality of the low-pressure sealing groove in most parts.

The technical indexes of the sealing groove are width 4H12, roughness Ra0.8, groove bottom R0.5 and notch R0.2, and the traditional processing method is to roughly mill the sealing groove by a T-shaped milling cutter with phi 20 multiplied by 2.5, and a margin of 0.1mm is left on one side. Finish machining selects a hard alloy T-shaped milling cutter with the diameter of 15 multiplied by 2.5, the linear speed is 136m/min, the feed rate of each tooth is 0.008mm, and the cutting edge of the milling cutter is ground into R0.5 so as to meet the design specification requirements of the groove bottom and the opening of the sealing groove, as shown in figure 2.

Because the width of the tool is less than the width of the groove, finishing requires two steps, first feeding the tool along one side wall of the groove and then feeding the tool along the other side wall. As shown in fig. 3(a) and 3(b), the sealing groove formed by such a machining method can meet the design specification requirements, but has two disadvantages:

(1) because the groove bottom is not finished by one-time processing, a tool catching mark inevitably exists, the weight of the tool catching mark depends on the repeated positioning precision of equipment and the vibration condition in the processing, and the control is difficult.

(2) When the cutter is used for cutting for the first time, all the cutting edges cut, the machining stability is relatively good, but when the cutter is used for cutting for the second time, the part to be machined is only an annular band with the width of about 1mm, although the allowance is small, the stability is poor when the cutter is used for cutting for the first time, the chattering hinge is serious, and obvious grain differences can appear on the bottom surface of the groove.

Disclosure of Invention

The invention aims to provide a helical angle anti-vibration T-shaped milling cutter for machining a sealing groove of an aluminum alloy part.

The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a take helix angle anti vibration T type milling cutter for processing of aluminum alloy class part seal groove, removes cutting edge upper portion grinding through the coping, only leaves the cutting edge of width for part seal groove width, forms 5 edges T type milling cutter of helix angle, the helix angle is 5 to 8.

Further, the T-shaped milling cutter is a 5-edge T-shaped milling cutter.

Further, the T-shaped milling cutter is an uncoated T-shaped milling cutter.

Further, the T-shaped milling cutter is a hard alloy T-shaped milling cutter.

Furthermore, the T-shaped milling cutter is provided with an inner cooling channel, the inner cooling channel is connected to the front edge part of the cutter from the center of the cutter handle, and cutting fluid is sprayed to a machining part in the cutting process.

Furthermore, the R angle of the T-shaped milling cutter edge is polished according to the size of the R angle at the bottom of the part sealing groove.

Compared with the prior art, the invention has the beneficial effects that: (1) after the sealing groove is machined by using a newly-made T-shaped milling cutter, the roughness of the bottom of the part sealing groove is obviously improved, the machining efficiency is improved, and the one-time qualified rate of assembly is increased; (2) the novel cutter provides technical support for the sealing groove processing technical scheme of other structural parts with high sealing requirements.

Drawings

Fig. 1(a) is a view showing a seal structure of an aluminum alloy case, and fig. 1(b) is a partially enlarged view.

Fig. 2 is a schematic view of a used grooving cutter.

Fig. 3(a) and 3(b) are schematic views of the notch.

FIG. 4 is a structural diagram of the helical angle anti-vibration T-shaped milling cutter for machining the sealing groove of the aluminum alloy part.

FIG. 5 is a comparison of the cutting patterns in the examples.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 4, a 5-blade hard alloy milling cutter with a helical angle, no coating and internal cooling is selected, the upper part of the blade is ground and removed through grinding, only a cutting blade with the width being the width of a groove of a part sealing groove is left, so that a 5-blade hard alloy T-shaped milling cutter with a helical angle and no coating is manufactured, and simultaneously the R angle of the blade of the T-shaped milling cutter is ground according to the size of the R angle at the bottom of the groove of the part sealing groove, so that the sealing groove is formed in one step.

Aiming at the phenomenon that chatter grains and connecting grains are obvious in the grooves machined by an old cutter, based on the characteristics of milling cutters with unequal tooth pitches, the milling cutters with unequal tooth pitches are selected and modified into T-shaped milling cutters, and compared with the prior T-shaped milling cutters, the newly manufactured hard alloy T-shaped milling cutter with 5-blade helical angles and no coating has the following advantages:

(1) the T-shaped milling cutter tool is provided with a helical angle of 5 degrees, compared with the conventional T-shaped milling cutter, the T-shaped milling cutter tool has a longer cutting edge, under the same cutting condition, the cutting force on the cutting edge of unit length is smaller, the cutting process is more stable, and the obtained surface quality is better.

(2) In order to reduce vibration in the machining process, the cutter is changed into odd-numbered teeth, and due to the incomplete symmetrical design of the odd-numbered teeth, when the cutter rotates at a high speed, the repeated cutting track cannot occur, the cutting force tends to be more stable, and the vibration can be effectively avoided.

Compared with a 3-edge milling cutter, the 5-edge milling cutter has higher machining efficiency under the condition of the same feed per tooth. Therefore, the 5-edge T-shaped milling cutter is selected for the embodiment.

(3) Because the finishing allowance of the sealing groove is only 0.1 on a single side, a non-coating milling cutter is selected, and the cutting edge is sharper, so that the surface quality is improved.

(4) The width of the new milling cutter is customized according to the size of the sealing groove, so that the sealing groove is machined and formed at one time, and the generation of cutter connecting grains is avoided.

(5) The newly manufactured T-shaped milling cutter has an inner cooling function, an inner cooling channel is connected to the front edge part of the cutter from the center of the cutter handle, cutting fluid can be fully sprayed to a machined part in the cutting process, the T-shaped milling cutter can play a role in lubricating, and the surface roughness after machining is effectively improved.

In order to visually compare the difference between the new and old cutters, the original T-shaped milling cutter and the T-shaped milling cutter of the invention are selected to mill a plane, the same rotating speed of 2000rad is adopted, the feeding is 100mm/min, and the surface effects obtained after processing are compared, as shown in figure 5:

in fig. 5, the upper surface grains are micro-grains cut by the old milling cutter according to the original processing method, and the lower surface grains processed by the T-shaped milling cutter of the invention, and the grains processed by the new cutter are much finer than those processed by the old cutter and have no joint tool mark by visual observation. The roughness measured by a roughness meter shows that the roughness Ra0.4 produced by the original T-shaped milling cutter and the roughness produced by the novel T-shaped milling cutter are only 0.18, so that the roughness is obviously improved.

Any combination of the above technical features of the embodiments may be performed, and for brevity, all possible combinations of the technical features in the above embodiments are not described, however, it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the spirit of the present application, and these are all within the protection scope of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.