A method for processing an open thin-walled part

Abstract

The application relates to the technical field of machining, and discloses a machining method for an open thin-wall part, which comprises the following specific steps: step one, rough machining, clamping the workpiece on a three-jaw chuck of a lathe, and machining the blank into a cylindrical shape; step two, first aging, performing first aging treatment on the part; step three, semi-precision turning, turning the inner hole and the outer circle, and respectively turning annular grooves on the inner hole and the outer circle, the inner hole and the outer circle annular grooves being uniformly spaced, and each annular groove being spaced by one part, so that a plurality of parts can be machined at the same time; step four, groove milling, symmetrically grooving the two side faces of the part after the semi-precision turning; step five, second aging; and step six, precision turning. According to the machining method for the open thin-wall part, the inner hole and the outer circle of the semi-precision turning process are respectively turned into annular grooves, one side is only left with a 1mm allowance, each inner annular groove and outer annular groove is one part, and the spacing is uniformly connected, so that the clamping difficulty of the thin-wall part is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining, in particular to a machining method of an open thin-walled part. BACKGROUND

[0002] The forged aluminum alloy LD2 has low density, high strength, good plasticity, good heat conduction, good electrical conductivity, good corrosion resistance and good mechanical properties, and is widely used in the manufacture of engine, impeller, aircraft joint and frame.

[0003] The certain pressing plate is one of parts of a turbocharger, has an open thin-walled structure, is made of forged aluminum LD2, and has a thickness-to-contour size ratio of 1:60. During machining of the aluminum alloy thin-walled part, the thin-walled part is easily deformed due to the action of clamping force, cutting force and a large amount of heat generated during the machining process, thereby affecting the size and position accuracy of the part. The open thin-walled part has the characteristics of thin wall and openness, and has deformation such as bending, twisting and bending-twisting combination after forming by machining or linear cutting, and thus is a difficult point in process control during machining. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application provides a machining method of an open thin-walled part, which has the advantages that the inner hole and the outer circle of the semi-finish turning process are turned into annular grooves respectively, and each inner annular groove and outer annular groove is a part with uniform spacing, thereby solving the problem of difficult clamping of the thin-walled part.

[0006] (II) Technical solutions

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a machining method of an open thin-walled part, comprising the following specific steps:

[0008] Step 1, rough machining, clamping the workpiece on the three-jaw chuck of the lathe, and processing the blank into a cylindrical shape;

[0009] Step 2, first aging, performing first aging treatment on the part;

[0010] Step 3, semi-finish turning, turning the inner hole and the outer circle, and turning the inner hole and the outer circle into annular grooves respectively, the inner hole and the outer circle annular grooves are uniformly spaced, each annular groove is a part, a plurality of parts can be machined at the same time, and a plurality of parts are clamped using the same blank body;

[0011] Step 4, groove milling, symmetrically grooving the two side surfaces of the semi-finish turned part;

[0012] Step 5, second aging, the entire part is connected only by the annular groove part at this time, and second aging treatment is performed on the part.

[0013] Step six, finish turning, switch the finish turning tool, process the part size to the right place, finish turning first, then turn the outer circle to the size, and finally turn the inner hole, the last turning part will fall off from the blank;

[0014] Step seven, integrate the parts, complete the integration of the whole part through numerical control milling and bench work.

[0015] Preferably, the first aging mainly releases the residual stress of the blank.

[0016] Preferably, the second aging mainly releases the residual stress of the machining process.

[0017] Preferably, the single side allowance of the part is 3mm during rough machining.

[0018] Preferably, the single side allowance of the part is 1mm during semi-finish turning.

[0019] (Three) beneficial effects

[0020] Compared with the prior art, the present application provides an open thin-walled part machining method, which has the following beneficial effects:

[0021] 1. The open thin-walled part machining method, by turning the inner hole and outer circle of the semi-finish turning process into ring grooves, leaving only 1mm of single side allowance, each inner ring groove and outer ring groove is a part, and is uniformly connected, solving the problem of difficult clamping of thin-walled parts.

[0022] 2. The open thin-walled part machining method, the milling process after semi-finish turning is to symmetrically groove the two side surfaces of the semi-finish turned part, further releasing the internal stress of the open structure, and compared with the conventional method (or milling or), this method can release stress to a great extent, is economical and practical. DETAILED DESCRIPTION

[0023] Figure 1 is a part structure schematic diagram;

[0024] Figure 2 is a part rough machining structure schematic diagram;

[0025] Figure 3 is a part semi-finish machining sectional view;

[0026] Figure 4 is a part semi-finish machining structure schematic diagram;

[0027] Figure 5 is a part side groove structure schematic diagram. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-4 A method for machining open thin-walled parts, 1. The specific steps are as follows:

[0030] Step 1: Rough machining. Clamp the workpiece on the three-jaw chuck of the machine tool and machine the blank into a cylindrical shape. Leave a 3mm allowance on one side of the part during rough machining.

[0031] Step 2, First Aging: Perform the first aging treatment on the parts. The first aging mainly releases the residual stress in the blank.

[0032] Step 3: Semi-finish turning, turning the inner hole and outer circle, and turning the inner hole and outer circle with annular grooves respectively. The annular grooves of the inner hole and outer circle are evenly spaced, and each annular groove is a part. Several parts can be processed at the same time. During semi-finish turning, the single side of the part is left with a 1mm allowance. Multiple parts are clamped using the same blank body, which solves the problem of difficult clamping of a single part and large deformation.

[0033] Step 4: Milling grooves, symmetrically slotting both sides of the semi-finished part;

[0034] Step 5, Second Aging: At this point, the entire part is only connected by the annular groove. The part undergoes a second aging treatment, which mainly releases residual stress from the machining process.

[0035] Step 6: Finish turning. Switch to the finish turning tool and machine the part to the required dimensions. When finish turning, first turn the two end planes, then machine the outer diameter to the required dimensions, and finally turn the inner hole. After the last turn, the part will fall off the blank. At this point, the part's outer shape machining is complete.

[0036] Step 7: Assemble the parts. The entire part is assembled using CNC milling and fitter work.

[0037] It should be noted that the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An open thin-walled part machining method, which comprises the following specific steps: Step one, rough machining, clamping the workpiece on the three-jaw chuck of the lathe, and processing the blank into a cylindrical shape; Step two, first aging, performing the first aging treatment on the part; Step three, semi-finish turning, turning the inner hole and outer circle, and respectively turning annular grooves on the inner hole and outer circle, the inner hole and outer circle annular grooves are uniformly spaced, each annular groove is spaced by one part, a plurality of parts can be machined at the same time, and the plurality of parts are clamped by using the same blank body; Step four, groove milling, symmetrically grooving the two side surfaces of the semi-finish turned part; Step five, second aging, the entire part is connected only by the annular groove at this time, and the second aging treatment is performed on the part; Step six, finish turning, switching the finish turning tool, and processing the size of the part to the right position, the finish turning first turns the two end surfaces, then processes the outer circle to the size, and finally turns the inner hole, and the part will fall off from the blank after the last turning; Step seven, integrating the part, completing the integration of the entire part through numerical control milling and bench work.

2. The method of claim 1, wherein: The first aging mainly releases the residual stress of the blank.

3. The method of claim 1, wherein: The second aging mainly releases the residual stress in the machining process.

4. The method of claim 1, wherein: The part has a single side allowance of 3mm during the rough machining.

5. The method of claim 1, wherein: The part has a single side allowance of 1mm during the semi-finish turning.

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