CN110560761A - Numerical control machining method for side groove of aluminum alloy edge strip - Google Patents

Numerical control machining method for side groove of aluminum alloy edge strip Download PDF

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Publication number
CN110560761A
CN110560761A CN201910878100.7A CN201910878100A CN110560761A CN 110560761 A CN110560761 A CN 110560761A CN 201910878100 A CN201910878100 A CN 201910878100A CN 110560761 A CN110560761 A CN 110560761A
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groove
side groove
edge strip
numerical control
aluminum alloy
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CN110560761B (en
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戴朝辉
高涛
龚清洪
张�浩
王斌利
张译文
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Chengdu Aircraft Industrial Group Co Ltd
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Chengdu Aircraft Industrial Group Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C3/00Milling particular work; Special milling operations; Machines therefor
    • B23C3/28Grooving workpieces

Abstract

The invention relates to the technical field of numerical control machining, in particular to a numerical control machining method for a side groove of an aluminum alloy edge strip, which comprises the following steps of: a. designing the sizes of a process boss connected with the side groove of the part and an avoidance groove on the process boss, and processing other characteristics of the part except the avoidance groove and the side groove; b. selecting a machining tool according to the minimum size of the notch profile of the side groove, and machining an avoidance groove on the technological boss; c. milling a side groove of the part; d. a downward-breaking process boss and a connecting sheet. By the method, the problem that the side groove of the edge strip is difficult to process can be effectively solved, and the processing quality and efficiency are improved.

Description

Numerical control machining method for side groove of aluminum alloy edge strip
Technical Field
The invention relates to the technical field of numerical control machining, in particular to a numerical control machining method for a side groove of an aluminum alloy edge strip.
Background
In the prior art, for machining a side groove, a process boss at the side groove of a part is generally removed by numerical control machining, and then a small-diameter cutter with a large swing angle is selected for machining. However, the method has a large quality risk, and because the part is not protected by a process boss and has poor rigidity, the method has great risks of cutter bouncing and broaching, and the processing of the edge strip of the part has a large quality hidden danger. Or a method for processing the side swing angle from the inner shape of the part, but the method has higher requirements on the structure of the side groove, and the side groove needs to meet the following requirements: the profile is larger in size where the bead forms an open angle with the web. However, the side groove structure of many parts does not satisfy these conditions, and the method is not widely applicable.
Along with the development of aviation technology, the requirement of new generation aviation equipment is higher and higher, and the border strip side face groove is gradually taken as a common structure of part design, appears more on various frame roof beam parts, can whether high-efficient accurate system side face groove greatly influences production, the assembly of this type of frame roof beam part, influences the assembly structure of complete machine then. The side groove is formed by a polygonal groove, is positioned on the part outline side edge strip and only penetrates through the part outline edge strip. The bottom surface of the side groove is a web surface, and the side groove and the web surface are formed by a bottom angle R2Smooth transition, generally requires the shortest dimension of the profile of the side groove to be more than or equal to 8 mm.
In the prior art, the side groove of the aluminum alloy edge strip has no definite processing mode, is mostly influenced by personal experience of process programmers, and has different processing modes. Meanwhile, a large margin is generally reserved when the side groove is machined, the side groove is left to be polished by a fitter, the machining and delivery efficiency of parts is greatly influenced, and the development trend of the current machining industry is not met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a numerical control machining method of an aluminum alloy flange strip side groove, which can effectively solve the problem of difficult machining of the flange strip side groove and improve the machining quality and efficiency.
The invention is realized by adopting the following technical scheme:
a numerical control machining method for a side groove of an aluminum alloy edge strip is characterized by comprising the following steps of: the method comprises the following steps:
a. designing the sizes of a process boss connected with the part side groove and an avoidance groove on the process boss, and processing other characteristics of the part except the avoidance groove and the side groove, including the process boss and a connecting sheet between the process boss and the edge strip;
b. Selecting a machining tool according to the minimum size of the notch profile of the side groove, machining an avoidance groove on the process boss, wherein the avoidance groove penetrates through the process boss along the normal direction of the outer surface of the edge strip of the part where the side groove is located, and the projection of the side groove of the part on a plane perpendicular to the normal direction is enveloped by the projection of the side groove on the plane;
c. c, selecting the machining tool in the step b, and performing forward milling on a side groove of the machined part;
d. A downward-breaking process boss and a connecting sheet.
the selection basis of the processing cutter in the step b is as follows:
D=Lmin-(1~2)mm,
wherein D is the diameter of the tool, LminIs the minimum dimension of the profile dimension of the lateral groove.
When the avoidance groove is processed in the step b:
Wherein D is the diameter of the tool, Ap2for other layer cuts deep, Ae is cut wide.
When the side groove is processed in the step c, the other layers are cut to be deep Ap2The relationship to the bead thickness H is:
when the avoidance groove is processed in the step b and the side groove is processed in the step c, the cutting depth of the last axial cutter during processing is as follows:
Ap1=Ap2+R1+(1~2)mm
wherein Ap1For the last axial cut, Ap2For cutting deep into other layers, R1For machining the bottom teeth of the tool.
The size of the avoiding groove in the step a is as follows:
L2=L1+(10~20)mm,
H2=H1+(7~15)mm,
Wherein L is2to avoid the lengthwise dimension of the sheave profile, L1Is the length dimension of the profile of the side groove, H2To avoid the dimension of the grooved profile in the thickness direction, H1Is the thickness dimension of the profile of the lateral groove.
The size of the process boss in the step a is as follows:
L3=L2+2R3+(10~30)mm,
H3=H2+R3+(10~30)mm,
Wherein L is3Is the dimension of the technological boss in the length direction of the outline, L2to avoid the lengthwise dimension of the sheave profile, R3Is the radius of the cutter sleeve, H3Dimension in the thickness direction of the contour of the process boss, H2the size of the groove profile in the thickness direction is avoided.
Other features of step a include the flanges, webs and physical dimensions of the side slots.
The method for processing the avoidance groove in the step b comprises the following steps: the groove is machined from inside to outside, the feeding is carried out preferentially in the axial direction, only the first full-cutter cutting is carried out in the radial direction, the side teeth are cut subsequently, and the bottom teeth do not participate in the machining.
And c, when a side groove of the part is machined in the step c, feeding in a radial preferential mode, and adopting a machining method of cycloid milling, wherein the allowance left between the side surface and the bottom surface is at least 0.05 mm.
compared with the prior art, the invention has the beneficial effects that:
1. Compared with the conventional processing mode of the side grooves, the numerical control processing method of the side grooves of the edge strips is divided into other characteristic processing, avoidance groove processing and side groove processing, the processing of the side grooves and other characteristics related to the avoidance grooves is completed through a large-diameter milling cutter, the processing of the avoidance grooves and the side grooves is completed through a small-diameter milling cutter, the processing quality of the side grooves of the edge strips of the parts is guaranteed, and the processing efficiency is improved. And the design and processing of auxiliary avoiding grooves are added, the rigidity of parts during processing is improved, the numerical control processing of the side grooves of the parts is scientifically and normatively carried out, the processing difficulty of the side grooves of the edge strips is simplified, and the processing quality and the processing efficiency of the parts are ensured.
2. The cutter is selected according to the minimum size of the profile size of the side groove, the cutter with a larger diameter can be scientifically selected in the small-diameter milling cutter, and the processing of the avoiding groove and the side groove can be better completed.
3. Through the rim strip thickness or the diameter of the cutter, other layers are scientifically selected to be cut deep, so that the processing is more scientific, and the processing quality of the side groove of the part rim strip is ensured.
4. When the milling cutter is used for machining, the cutting depth of the last axial cutter is guaranteed, and the phenomenon that the last axial cutter vibrates due to too thin thickness when milling the avoidance groove or the side groove is guaranteed.
5. the reasonable size of the avoiding groove ensures the normal feeding of the cutter.
6. The reasonable size of the process boss ensures that the cutter does not collide when in angle swinging milling.
7. The technical boss is connected with the part through the connecting piece, so that the rigidity of the part during the side groove processing is increased, meanwhile, enough space for feeding of a cutter during the subsequent side groove processing is ensured, and the side groove processing is arranged at the end, so that the rigidity of other related characteristics during the processing is ensured.
9. the method for processing the avoidance groove in the step b comprises the following steps: the mode of processing the groove from inside to outside is adopted, the feeding is carried out preferentially in the axial direction, the radial direction is guaranteed to be cut only by the first full cutter, the subsequent cutting is carried out by the side teeth, the bottom teeth do not participate in the processing, and the cutter is protected.
10. When a side groove of a part is machined, radial preferential feeding is adopted, and a machining method of cycloid milling is adopted, so that the cutting allowance of each cutter in the radial direction is uniform, meanwhile, the allowance left between the side surface and the bottom surface is at least 0.05mm, and the machined surface of the part is prevented from being scratched.
drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic perspective view of a side groove according to the present invention;
FIG. 3 is a schematic perspective view of the side groove of the present invention connected to a process boss;
FIG. 4 is a schematic view of the planar structure of the side groove of the present invention connected to a process boss;
FIG. 5 is a schematic side view of the side groove of the present invention (wherein L1Is the length dimension of the profile of the side groove, H1Is the thickness dimension of the profile of the side groove, Lminis the side groove profile dimension minimum dimension);
FIG. 6 is a schematic view of the structure of the evasion groove of the present invention (wherein, L2To avoid the lengthwise dimension of the sheave profile, H2Is the size of the avoidance groove profile in the thickness direction);
FIG. 7 is a three-dimensional view showing the structure of the connection boss according to the present invention (wherein, H2To avoid the dimension of the grooved profile in the thickness direction, H3Dimension L in the thickness direction of the contour of the process boss2To avoid the lengthwise dimension of the sheave profile, L3The dimension of the process boss in the length direction of the contour);
The labels in the figure are:
1. The edge strip, 2, the web, 3, the outer side, 4, the side groove, 5, the connecting piece, 6, the technology boss, 7, dodge the groove.
Detailed Description
Example 1
as a basic embodiment of the invention, the invention comprises a numerical control machining method of the side groove of the aluminum alloy edge strip. The part material in the method is aluminum alloy, and referring to the attached figure 2 of the specification, a side groove 4 is formed by a polygonal groove, is positioned on the part outline side edge strip 1 and only penetrates through the part outline edge strip 1. The bottom surface of the side surface groove 4 is provided with a web plate 2, and the side surface groove 4 and the web plate 2 are smoothly transited by a bottom angle R2. The shortest dimension of the profile of the side groove 4 is more than or equal to 8 mm. Referring to the attached figure 1 of the specification, the method comprises the following steps:
a. A preparation stage: designing the sizes of a process boss 6 connected with the part side groove 4 and an avoiding groove 7 on the process boss 6, fixing the process boss and the avoiding groove on a vertical or horizontal machine tool workbench through a tool clamping part, and processing other characteristics of the part except the avoiding groove 7 and the side groove 4 according to the normal numerical control machine processing flow, including the process boss 6 and a connecting sheet 5 between the process boss 6 and the edge strip 1;
b. and (3) processing of the avoiding groove 7: selecting a machining tool according to the minimum size of the notch profile of the side groove 4, selecting a reasonable tool feeding and retracting mode, a machining mode and parameters to mill and machine an avoidance groove 7 on a process boss 6, wherein the avoidance groove 7 penetrates through the process boss 6 along the normal direction of the outer surface of the part edge strip 1 where the side groove 4 is located, and the projection of the side groove 4 of the part on a plane perpendicular to the normal direction is enveloped;
c. And (3) processing a side groove 4: c, selecting the machining tool in the step b, and setting a reasonable tool feeding and retracting mode, a machining mode and parameters to mill the side groove 4 of the machined part;
d. and (4) ending: and (5) cutting the process boss 6 and the connecting piece 5 to finish machining.
When machining the side groove 4, A, B pendulum or A, C pendulum of the machine tool is needed, and when the needed pendulum angle is too large and the conventional pendulum angle of the vertical machine tool is not enough, the elbow can be used for machining the feature.
Example 2
As a preferred embodiment of the invention, the invention comprises a numerical control machining method of a side groove of an aluminum alloy flange strip, which comprises the following steps:
a. a preparation stage: the sizes of a process boss 6 connected with the part side groove 4 and an avoiding groove 7 on the process boss 6 are designed, and other characteristics of the processed part except the avoiding groove 7 and the side groove 4 comprise the process boss 6 and a connecting sheet 5 between the process boss 6 and the edge strip 1.
b. and (3) processing of the avoiding groove 7: and selecting a machining tool according to the minimum size of the notch profile of the side groove 4, machining an avoidance groove 7 on the technological boss 6, wherein the avoidance groove 7 penetrates through the technological boss 6 along the normal direction of the outer surface of the part edge strip 1 where the side groove 4 is located, and the projection of the side groove 4 of the part on a plane perpendicular to the normal direction is enveloped by the projection of the plane. Wherein, the basis for selecting and using the processing cutter is as follows:
D=Lmin-(1~2)mm,
D is the diameter of the tool, Lminthe minimum dimension of the profile dimension of the lateral groove 4.
When the avoidance groove 7 is machined, the cutting depth Ap of the last axial cutter is1other layer cut depth Ap2Cutting width Ae, machining cutter bottom tooth R1The relationship to the tool diameter D is:
c. and (3) processing a side groove 4: and c, selecting the machining cutter in the step b, and milling the side groove 4 of the machined part. In the processing process, the cutting depth Ap is axially cut at the last step1Other layer cut depth Ap2And the bead thickness H are in relation to:
d. And (4) ending: a downward-breaking technical boss 6 and a connecting sheet 5.
Example 3
As the best mode of the invention, the invention comprises a numerical control machining method of a side groove of an aluminum alloy flange strip, which comprises the following steps:
a. A preparation stage: the sizes of a process boss 6 connected with the part side groove 4 and an avoidance groove 7 on the process boss 6 are designed, the parts are fixed on a vertical or horizontal machine tool workbench through tool clamping, other characteristics of the parts are processed according to the normal numerical control machine machining flow, and the side groove 4 to be processed is left at the end of part machining. The other characteristics are characteristics except the avoidance groove 7 and the side groove 4 and comprise a technical boss 6, a connecting sheet 5 between the technical boss 6 and the flange strip 1, the flange strip 1 at the position of the side groove 4, a web 2, an outer side surface 3 and the external dimension.
Referring to the specification, fig. 5 and the specification, fig. 6, the size of the avoiding groove 7 is as follows:
L2=L1+(10~20)mm,
H2=H1+(7~15)mm,
such as L1=30mm,H114mm, optionally L2=43mm,H2=22mm。
Referring to the attached figure 7 of the specification, the designed process boss 6 where the lower cutter avoiding groove 7 is located can meet the requirement that the cutter does not collide when in angle swing milling:
L3=L2+2R3+(10~30)mm,
H3=H2+R3+(10~30)mm,
such as L2=43mm,H2=22mm,R317mm, optionally L3=95mm,H3=52mm。
Wherein L is1Is the length dimension, L, of the profile of the side groove 42to avoid the dimension of the profile of the groove 7 in the length direction, L3Is the dimension of the technological boss 6 in the length direction of the outline, H1Is the thickness dimension H of the profile of the side groove 42To avoid the dimension of the profile of the groove 7 in the thickness direction, H3Dimension in the thickness direction of the profile of the process boss 6, R3Is the radius of the cutter sleeve.
b. And (3) processing of the avoiding groove 7: referring to the attached figure 5 of the specification, a machining cutter is selected according to the minimum size of the notch outline of the side groove 4, under the condition that the side groove 4 of the part can be machined, a cutter with a larger diameter is selected as far as possible, the bottom tooth is 1mm, and the diameter D of the cutter and the minimum size L of the outline of the side groove 4 are requiredminSatisfies the following conditions:
D=Lmin-(1~2)mm,
Such as Lmin8mm, and D6 mm can be selected.
When the avoidance groove 7 is machined on the process boss 6, a cutter feeding and retracting mode of conventional data machine machining is selected, broken line cutter feeding and arc cutter retracting are recommended, a mode of machining the groove from inside to outside is adopted, cutter feeding is carried out in an axial direction preferentially, only the first cutter is fully cut in the radial direction, side teeth are cut subsequently, bottom teeth do not participate in machining, and the cutters are protected. The machined avoidance groove 7 penetrates through the process boss 6 along the normal direction of the outer surface of the part edge strip 1 where the side groove 4 is located, and the projection of the side groove 4 of the part on a plane perpendicular to the normal direction envelops the projection of the side groove 4 of the part on the plane.
When the avoidance groove 7 is machined, the cutting depth Ap of the last axial cutter is1Other layer cut depth Ap2Cutting width Ae, machining cutter bottom tooth R1The relationship to the tool diameter D is:
c. And (3) processing a side groove 4: and c, selecting the machining cutter in the step b, and milling the side groove 4 of the machined part. In the machining process, a cutter feeding and retracting mode of conventional data machine machining is selected, broken line cutter feeding and circular arc cutter retracting are recommended, radial preferential mode cutter feeding is adopted, and a machining method of cycloid milling is adopted, so that the cutting allowance of each cutter in the radial direction is uniform, meanwhile, the allowance left between the side surface and the bottom surface is at least 0.05mm, and the machined surface of a scratched part is avoided.
in the processing process, the cutting depth Ap is axially cut at the last step1Other layer cut depth Ap2The relationship with the thickness H of the rim strip 1 is:
The processed parts refer to the description attached to fig. 4 and the description attached to fig. 5.
d. And (4) ending: a downward-breaking technical boss 6 and a connecting sheet 5.
for machining the side groove 4, A, B pendulum or A, C pendulum of the machine tool is needed, and when the needed pendulum angle is too large and the conventional pendulum angle of the vertical machine tool is not enough, the elbow can be used for machining the feature.

Claims (10)

1. A numerical control machining method for a side groove of an aluminum alloy edge strip is characterized by comprising the following steps of: the method comprises the following steps:
a. designing the sizes of a process boss (6) connected with the part side groove (4) and an avoiding groove (7) on the process boss (6), and processing other characteristics of the part except the avoiding groove (7) and the side groove (4), including the process boss (6) and a connecting sheet (5) between the process boss (6) and the edge strip (1);
b. Selecting a machining cutter according to the minimum size of the notch profile of the side groove (4), machining an avoidance groove (7) on the technological boss (6), wherein the avoidance groove (7) penetrates through the technological boss (6) along the normal direction of the outer surface of the part edge strip (1) where the side groove (4) is located, and the projection of the side groove (4) of the part on a plane perpendicular to the normal direction is enveloped;
c. C, selecting the machining cutter in the step b, and performing forward milling on a side groove (4) of the machined part;
d. A downward-breaking process boss (6) and a connecting sheet (5).
2. The numerical control machining method for the side groove of the aluminum alloy edge strip as recited in claim 1, characterized in that: the selection basis of the processing cutter in the step b is as follows:
D=Lmin-(1~2)mm,
wherein D is the diameter of the tool, LminIs the minimum size of the profile size of the lateral groove (4).
3. The numerical control machining method for the side groove of the aluminum alloy edge strip as recited in claim 2, characterized in that: when the avoidance groove (7) is processed in the step b:
Wherein D is the diameter of the tool, Ap2For other layer cuts deep, Ae is cut wide.
4. the numerical control machining method for the side groove of the aluminum alloy edge strip as recited in claim 3, characterized in that: when the side groove (4) is processed in the step c, the other layers are cut to be deep Ap2The relationship to the bead thickness H is:
5. The numerical control machining method for the side groove of the aluminum alloy edge strip as recited in claim 4, characterized in that: when the avoidance groove (7) and the side surface groove (4) are processed in the step b and the step c, the cutting depth of the last axial cutter during processing is as follows:
Ap1=Ap2+R1+(1~2)mm
Wherein Ap1For the last axial cut, Ap2For cutting deep into other layers, R1for machining the bottom teeth of the tool.
6. The numerical control machining method for the side groove of the aluminum alloy cap as recited in claim 1 or 5, characterized in that: the size of the avoiding groove (7) in the step a is as follows:
L2=L1+(10~20)mm,
H2=H1+(7~15)mm,
Wherein L is2To avoid the dimension of the groove (7) in the length direction, L1is the length dimension H of the profile of the side groove (4)2to avoid the dimension of the groove (7) in the thickness direction of the profile, H1Is the size of the profile thickness direction of the side groove (4).
7. the numerical control machining method for the side groove of the aluminum alloy edge strip as recited in claim 6, characterized in that: the size of the process boss (6) in the step a is as follows:
L3=L2+2R3+(10~30)mm,
H3=H2+R3+(10~30)mm,
wherein L is3is the dimension of the technological boss (6) in the length direction of the outline, L2To avoid the dimension of the groove (7) in the length direction, R3is the radius of the cutter sleeve, H3Dimension in the thickness direction of the profile of the technological boss (6), H2To avoid the dimension of the groove (7) in the thickness direction.
8. the numerical control machining method for the side groove of the aluminum alloy bead strip as recited in claim 1 or 7, characterized by comprising the following steps: other characteristics in step a also include the position of the lateral groove (4), the edge strip (1), the web (2) and the external dimension.
9. The numerical control machining method for the side groove of the aluminum alloy edge strip as recited in claim 8, characterized in that: the method for processing the avoidance groove (7) in the step b comprises the following steps: the groove is machined from inside to outside, the feeding is carried out preferentially in the axial direction, only the first full-cutter cutting is carried out in the radial direction, the side teeth are cut subsequently, and the bottom teeth do not participate in the machining.
10. The numerical control machining method for the side groove of the aluminum alloy edge strip as recited in claim 9, characterized by comprising the following steps: and c, when the side surface groove (4) of the part is machined in the step c, feeding in a radial preferential mode, and adopting a machining method of cycloid milling, wherein the allowance left between the side surface and the bottom surface is at least 0.05 mm.
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