阅读说明：本技术 一种对开机匣锥形外型面高效铣削的加工方法 (Machining method for efficiently milling conical outer surface of casing opening ) 是由 李健 李远宾 杨轶博 于 2021-08-10 设计创作，主要内容包括：一种对开机匣锥形外型面高效铣削的加工方法,属于数控加工技术领域。所述对开机匣锥形外型面高效铣削的加工方法,包括如下步骤：选择大进给功能的机夹铣刀；规划刀具轨迹,具体为：在锥形外型面表面创建刀具轨迹曲线；根据刀具轨迹生成分层的刀具加工轨迹,具体为：根据刀具轨迹曲线生成分层的刀具加工轨迹曲线,并设置切削参数；根据切削参数进行锥形外型面的铣削加工。所述对开机匣锥形外型面高效铣削的加工方法通过选择大进给功能的刀具、加工策略以及切削参数,实现对开机匣锥形外型面的高效铣削加工,提高了加工效率和产品质量,降低了加工成本。(A processing method for efficiently milling the conical outer surface of an opening casing belongs to the technical field of numerical control processing. The machining method for efficiently milling the tapered outer surface of the split casing comprises the following steps of: selecting a machine-clamped milling cutter with a large feeding function; planning a cutter path, specifically: creating a tool path curve on the surface of the conical outer profile; generating a layered tool machining track according to the tool track, specifically: generating a layered cutter processing track curve according to the cutter track curve, and setting cutting parameters; and milling the conical outer profile according to the cutting parameters. According to the method for efficiently milling the tapered outer profile of the split casing, the cutter with the large feeding function, the processing strategy and the cutting parameters are selected, so that efficient milling of the tapered outer profile of the split casing is realized, the processing efficiency and the product quality are improved, and the processing cost is reduced.)

1. A machining method for efficiently milling the conical outer surface of an opening casing is characterized by comprising the following steps:

s1, selecting a machine clamp milling cutter with a large feeding function;

s2, planning a cutter path, specifically: creating a tool path curve on the surface of the conical outer profile;

s3, generating a layered cutter processing track according to the cutter track, specifically: generating a layered cutter processing track curve according to the cutter track curve, and setting cutting parameters;

and S4, milling the conical outer profile according to the cutting parameters.

2. The method as claimed in claim 1, wherein the tool path curve is a straight milling method and a continuous smooth path, and there is a circular arc transition at the corner of the tool path curve.

3. The method of claim 1, wherein the cutting parameters include line speed, feed per tooth, depth of cut per layer, width of cut, and feed of cut.

4. The method of claim 3, wherein the linear velocity: 30 m/min; feed per tooth: 0.5 mm/z; cutting depth of each layer: 0.5 mm; the cutting width is 12 mm; cutting feed amount: 715 mm/min.

5. The method as claimed in claim 1, wherein the material of the milling insert is selected according to the material of the workpiece.

6. The method as claimed in claim 1, wherein the parameters of the milling cutter including the diameter of the tool, the radius of the corner rounding, the number of teeth of the tool and the total length of the tool are determined according to the configuration of the tapered outer surface and the machining allowance.

Technical Field

The invention relates to the technical field of numerical control machining, in particular to numerical control machining of a tapered outer surface structure of an open casing, and particularly relates to a machining method for efficiently milling the tapered outer surface of the open casing.

Background

The split casing belongs to an important part of an aeroengine casing, is a high-temperature alloy difficult-to-machine material, and has the characteristics of high dimensional precision, poor structural rigidity and the like. The process generally comprises rough machining and finish machining steps, and is processed by adopting a solid hard alloy milling cutter, and the rough machining step has large machining allowance and high material hardness, so that the cutting efficiency is low, the machining period is long, the cutter is seriously abraded, and the outer surface finish machining quality is seriously influenced. Therefore, there is a need to develop an efficient milling process suitable for parting the tapered outer profile of the casing.

Disclosure of Invention

In order to solve the technical problems of low milling efficiency and the like of the tapered outer surface of the split casing in the prior art, the invention provides a machining method for efficiently milling the tapered outer surface of the split casing.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a machining method for efficiently milling the conical outer surface of an opening casing comprises the following steps:

s1, selecting a machine clamp milling cutter with a large feeding function;

s2, planning a cutter path, specifically: creating a tool path curve on the surface of the conical outer profile;

s3, generating a layered cutter processing track according to the cutter track, specifically: generating a layered cutter processing track curve according to the cutter track curve, and setting cutting parameters;

and S4, milling the conical outer profile according to the cutting parameters.

Furthermore, the tool path curve adopts a forward milling processing mode and a continuous smooth feed path, and the corners of the tool path curve have arc transitions.

Further, the cutting parameters include line speed, feed per tooth, cutting depth per layer, cutting width, and cutting feed.

Preferably, the linear velocity: 30 m/min; feed per tooth: 0.5 mm/z; cutting depth of each layer: 0.5 mm; the cutting width is 12 mm; cutting feed amount: 715 mm/min.

Further, the material of the machine clamp milling cutter blade is selected according to the material of the workpiece.

And further, determining parameters of the mechanically clamped milling cutter according to the structure and the machining allowance of the conical outer profile, wherein the parameters of the mechanically clamped milling cutter comprise the diameter of the cutter, the radius of a cutter nose fillet, the number of teeth of the cutter and the total length of the cutter.

The invention has the beneficial effects that:

1) according to the invention, through the use of a cutter with a large feeding function, the optimized design of the efficient milling tool path and the reasonable selection of cutting parameters, the problem of low milling efficiency of the conical outer profile of the casing opening is solved, the utilization efficiency of equipment can be improved, and the processing cost of an enterprise is reduced.

2) The invention has been applied to the process of fine milling the external profile of the extended case, more than 100 machines are stably produced, the processing time is shortened from original 330 minutes to 70 minutes, the number of cutters is reduced from original 3 integral hard alloy milling cutters to 3 machine clamping blades, the wall thickness of the processed surface is uniform and consistent, the processing quality is stable, the milling processing efficiency is improved by more than 70 percent, the cutter cost is reduced by more than 70 percent, and the invention can be expanded to cases with other similar structures for use.

3) With the annual increase of the number of the demands of the engine casing, the method has important practical significance for researching the efficient milling method of the conical outer profile surface structure of the engine casing in order to solve the problems of low part processing efficiency, processing quality and the like.

Additional features and advantages of the invention will be set forth in part in the detailed description which follows.

Drawings

FIG. 1 is a flow chart of a method for efficiently milling the tapered outer surface of a split case according to the present invention;

FIG. 2 is a schematic view of an extended outer surface structure of a casing according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a machining area of the machining area of FIG. 2;

FIG. 4 is a schematic diagram of a Phi 20R1.8 large-feed function machine-clamped milling cutter provided by an embodiment of the invention;

FIG. 5 is an enlarged, fragmentary view of the clamp milling cutter of FIG. 4;

FIG. 6 is a schematic diagram of the setting of processing tool parameters in UG software provided by the embodiments of the present invention;

FIG. 7 is a schematic diagram of UG software-driven tool path parameter setting provided by the embodiment of the invention;

FIG. 8 is a schematic view of an outer surface-driven tool rail of the casing according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of UG software hierarchical tool path parameter setting provided by the embodiment of the invention;

fig. 10 is a schematic diagram of a casing outer profile layering tool path provided by an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In order to solve the problems in the prior art, as shown in fig. 1, the invention provides a method for efficiently milling a tapered outer surface of an open casing, which comprises the following steps:

s1, selecting a machine clamp milling cutter with a large feeding function; selecting the material of the machine-clamped milling cutter blade according to the material of a workpiece; determining parameters of a mechanically clamped milling cutter according to the structure of the conical outer profile and the machining allowance, wherein the parameters of the mechanically clamped milling cutter comprise the diameter of a cutter, the radius of a cutter nose fillet, the number of teeth of the cutter and the total length of the cutter;

s2, planning a cutter path, specifically: creating a tool path curve on the surface of the conical outer profile; the tool path curve adopts a forward milling processing mode and a continuous smooth feed path, and a corner of the tool path curve is provided with arc transition;

s3, generating a layered cutter processing track according to the cutter track, specifically: generating a layered cutter processing track curve according to the cutter track curve, and setting cutting parameters; the cutting parameters comprise a linear speed, a feed per tooth, a cutting depth per layer, a cutting width and a cutting feed; preferably, the linear velocity: 30 m/min; feed per tooth: 0.5 mm/z; cutting depth of each layer: 0.5 mm; the cutting width is 12 mm; cutting feed amount: 715 mm/min;

and S4, milling the conical outer profile according to the cutting parameters.

Example one

A machining method for efficiently milling the conical outer surface of an opening casing comprises the following steps:

s1, selecting a machine clamp milling cutter with a large feeding function; the material of the machine-clamped milling cutter blade is selected according to the material of a workpiece; in the embodiment, the workpiece is made of high-temperature alloy, and the blade is made of MS 2050; according to the structure and the machining allowance of the conical outer molded surface, parameters of the mechanically clamped milling cutter are determined, and the method specifically comprises the following steps: the diameter phi of the cutter is 20mm, the radius R1.8mm of a cutter tip fillet, the number of teeth of the cutter is 3, and the total length of the cutter is 160 mm;

s2, planning a tool path for efficient milling, specifically: creating a tool path curve on the surface of the conical outer profile;

in the embodiment, UG software is applied to generate a driving tool track on the surface of the outer profile by adopting a variable-axis boundary driving method, the tool track has the characteristics of a forward milling processing mode and a continuous smooth feed path, and the circular arc R at the corner is transited to generate a CLS format driving tool path file;

s3, generating a layered cutter processing track according to the cutter track, specifically: generating a layered cutter processing track curve according to the cutter track curve, and setting cutting parameters;

in this embodiment, the UG software is used to generate a layered tool machining trajectory on the outer surface, and the specific method is as follows: establishing a variable-axis machining operation step, adopting a variable-axis tool path driving method, importing a CLS format driving tool path file generated in the previous step, setting the tool axis direction to be the same as the driving tool path file, setting cutting parameters according to the machining allowance, generating a layered tool machining path, and generating a G code numerical control program through a UG (user generated) post processor;

in this embodiment, the cutting parameters are set as follows: linear velocity: 30m/min (spindle speed 477 rpm); feed per tooth: 0.5 mm/z; cutting depth of each layer: 0.5 mm; cutting width 12mm (cutter diameter 60%); cutting feed amount: 715 mm/min;

and S4, milling the conical outer profile according to the cutting parameters.

Example two

The method is characterized in that a working procedure of finish milling of an outer profile of a certain extension casing is carried out on a five-coordinate milling and turning composite machining center (model STC800MT), the material of the part is GH706 high-temperature alloy, the maximum diameter phi 686 of the part, the taper of the outer profile is 10 degrees, the wall thickness is 1.7mm, the machining allowance of the outer profile is 2.2mm, the periphery of the outer profile is connected with a fillet R10, the structure and the machining area of the part are shown in figures 2 and 3, and the specific implementation steps are as follows:

s1, selecting the mechanically clamped milling cutter with the large feed function:

selecting a mechanically-clamped milling cutter with a phi 20R1.8 large-feed function, wherein the shape and the size of the cutter are shown in a graph 4 and a graph 5, establishing a phi 20R1.8 milling cutter in UG software, wherein the type of the cutter is a milling cutter-5 parameter, and the specific parameter is shown in a graph 6;

s2, planning a tool path for efficient milling:

as shown in fig. 7, a variable axis boundary operation step is established in UG software, a machining region is selected in a cutting region, a projection vector is selected to be perpendicular to a boundary direction, a boundary driving method is selected, a machining region boundary is selected in the boundary, a cutting mode is set to follow the periphery, a tool path direction is outward, a cutting direction is down-milling, a cutting step is 60% of a tool diameter, and a tool axis is perpendicular to a component; as shown in fig. 8, a driving tool trajectory is generated; then, the tool path is converted into a CLS format drive tool path file by a software output CLSF function;

s3, generating a layered tool machining track according to the tool track:

establishing a variable-axis tool path operation step in UG software, selecting a machining area in a cutting area, projecting a vector to select a tool shaft, selecting a tool path driving method, importing a CLS format driving tool path file, selecting the tool shaft direction to be the same as a driving track, setting multiple tool paths in cutting parameters, setting a component offset margin of 2mm, cutting depth of each layer to be 0.5mm, setting a tool spindle rotation speed 477rpm and cutting feed 715mm/min as shown in figure 9, and generating a layered tool path as shown in figure 10;

s4, milling the conical outer profile according to the cutting parameters;

and then, generating tool tracks in the rest processing areas according to the methods of the steps S1, S2 and S3 in sequence, converting the tool tracks into G code numerical control programs through a UG software post-processing function, solidifying the numerical control programs into process files, guiding production and processing, realizing efficient milling of the tapered outer surface of the casing, shortening the processing time from 330 minutes to 70 minutes, improving the processing efficiency by 78%, reducing the tool cost from 1923 yuan to 240 yuan, reducing the tool cost by 87%, and enabling the wall thickness of the processing areas to be uniform and consistent.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.