Method for reducing machining deformation of high-precision bushing parts

Abstract

The present application relates to a kind of methods for reducing the machining deformation of high-precision bushing parts, comprising the following steps: S1, after clamping good part blank, rough turning out bushing at one end of part blank, and the radial allowance of precision size is Φ0.3mm after rough turning;S2, the thickness of the connecting part of part blank and bushing is pre-cut to 0.5mm;S3, using taper shank cutter with diameter D3, multiple boss connecting pieces are evenly milled along the circumferential direction of part blank at the connecting part of part blank and bushing;S4, the radial allowance is divided into three times finishing size in place according to every cutting amount Φ0.1mm, and finally the bushing after finishing is cut off from part blank along boss connecting piece by slotting cutter.The beneficial effects of the present application are that machining stress of the part can be effectively released after rough machining, thereby reducing the deformation after cutting of the part, ensuring the precision size, and further saving manpower and material resources, reducing cost.

Description

Technical Field

[0001] This invention relates to the field of bushing parts processing technology, and specifically to a method for reducing deformation during the processing of high-precision bushing parts. Background Technology

[0002] The conventional machining method for bushing parts is to first rough turn, then pre-cut connecting pieces, and finally finish turn. After rough turning the blank with a radial allowance of ∅0.3mm, a connecting piece with a thickness of 0.5mm is pre-cut directly. Finally, semi-finish turning and finish turning are performed to the required dimensions before cutting. While this machining method shows that the parts meet design requirements when measured on the machine tool, the parts often become elliptical after cutting. Analysis reveals that this is mainly due to machining stress present after rough turning, which cannot be released during machining. This stress affects the parts during cutting, causing dimensional deviations. This often requires additional workmanship for correction, and there is a risk of scrapping the parts after correction, consuming significant manpower and resources. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for reducing the deformation of high-precision bushing parts during machining. This method can effectively release the machining stress of the parts after roughing, thereby reducing the deformation of the parts after cutting, ensuring precise dimensions, and thus saving manpower and resources and reducing costs.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A method for reducing machining deformation of high-precision bushing parts includes the following steps:

[0006] S1. After clamping the part blank, rough machine one end of the part blank to produce the bushing. After rough machining, the radial allowance of the precision dimension is Φ0.3mm.

[0007] S2. Pre-cut the thickness of the connection between the part blank and the bushing to 0.5mm;

[0008] S3. Using a taper shank end mill with a diameter of D3, mill multiple boss connecting pieces evenly along the circumference of the part blank at the connection between the part blank and the bushing.

[0009] S4. The radial allowance is precision machined into the required size in three steps, with each cut depth being Φ0.1mm. Finally, the precision-machined bushing is cut off from the workpiece blank using a cutter along the boss connecting piece.

[0010] Furthermore, before rough machining the bushing, straighten the outer circle of the part blank located at the bushing outer diameter groove to ensure that the runout of the outer circle at the outer diameter groove is less than 0.1mm, and at the same time set a machining zero point at the center of the machining end face of the part blank.

[0011] Furthermore, during rough turning of the bushing, first use an external turning tool to rough turn the outer diameter, outer chamfer, and end face of the bushing; then use an internal turning tool to rough turn the inner hole and inner chamfer of the bushing; next use an external grooving tool to rough turn and finish turn the outer diameter groove of the bushing; then use an internal grooving tool to rough turn and finish turn the inner hole groove of the bushing; finally, use a center drill to perform spot drilling and drilling at the outer diameter groove in sequence.

[0012] Furthermore, when pre-cutting the connection between the part blank and the bushing, the allowance in the Z direction is 0.1mm and the allowance in the X direction is 1.5mm.

[0013] Furthermore, during finish turning, the outer diameter, chamfer, and end face of the bushing are first finished using an external turning tool, then the inner diameter and chamfer of the bushing are finished using an internal turning tool, and finally the chamfer is finished using an external grooving tool.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention employs a machining method involving rough turning, pre-cutting, milling of the boss connecting piece, and final finishing turning. This method adds an optimized step of milling the boss connecting piece to the existing machining process. After rough machining, the machining stress on the part is effectively released, reducing deformation after cutting and ensuring that the precision dimensions meet design requirements. Furthermore, the three-stage finishing process makes precision dimension machining more stable. The entire process is simpler, faster, and more efficient, facilitating on-site operation and effectively solving the problem of part deformation. It also eliminates the need for additional fitter adjustments, saving manpower and resources and reducing processing costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the clamping of the part blank in this invention;

[0017] Figure 2 This is a schematic diagram of the roughing process of the bushing in this invention;

[0018] Figure 3 This is a schematic diagram of the pre-cutting process of the connection between the part blank and the bushing in this invention;

[0019] Figure 4 This is a schematic diagram of the milling process for the boss connecting piece in this invention;

[0020] Figure 5 This is a schematic diagram of the precision machining process for the bushing in this invention.

[0021] In the diagram: 1. Part blank; 2. Bushing; 3. Boss connecting piece; 4. Outer diameter groove; 5. Inner hole groove; 6. Oil passage hole. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0023] like Figures 1-4 As shown, a method for reducing deformation during the machining of high-precision bushing parts includes the following steps S1 to S4:

[0024] S1, such as Figure 2 As shown, after clamping the part blank 1, the bushing 2 is rough machined from one end of the part blank 1. After rough machining, the radial allowance of the precision dimension is Φ0.3mm.

[0025] Before rough machining the bushing 2, straighten the outer circle of the part blank 1 located at the outer diameter groove 4 of the bushing 2 to ensure that the runout of the outer circle at the outer diameter groove 4 is less than 0.1. At the same time, set the machining zero point at the center of the machining end face of the part blank 1.

[0026] When roughing bushing 2, first use an external turning tool to rough turn the outer circle, outer chamfer and end face of bushing 2, then use an internal turning tool to rough turn the inner hole and chamfer of bushing 2, then use an external grooving tool to rough turn and finish turn the outer diameter groove 4 of bushing 2, then use an internal grooving tool to rough turn and finish turn the inner hole groove 5 of bushing 2, and finally use a center drill to perform spot drilling and drilling at the outer diameter groove 4 to complete the machining of oil hole 6.

[0027] In one specific embodiment of the present invention, such as Figure 1 As shown, the outer diameter of part blank 1 is Φ78mm and the inner diameter is Φ50mm. After the part blank 1 is clamped by the fixture, with the machining zero point as the center, the axial direction of part blank 1 is Z-direction and the radial direction is X-direction. The specifications of the external turning tool used for rough turning are A80*R0.4*F25, the specifications of the internal turning tool are A55*R0.4*D25, the specifications of the external grooving tool are W2R0.15, the specifications of the internal grooving tool are W2R0.2, and the specifications of the center drill are D2.5.

[0028] S2, such as Figure 3 As shown, the thickness of the connection between the part blank 1 and the bushing 2 is pre-cut to 0.5mm.

[0029] When pre-cutting the connection between the blank 1 and the bushing 2, a allowance of 0.1 mm is made in the Z direction and 1.5 mm in the X direction. Based on the specific implementation method in step S1 above, a grooving cutter with an outer diameter of W4R0.4 is used for pre-cutting the connection between the blank 1 and the bushing 2.

[0030] S3, such as Figure 4 As shown, using a tapered shank end mill with a diameter of D3, multiple boss connecting pieces 3 are evenly milled along the circumference of the part blank 1 at the connection between the part blank 1 and the bushing 2.

[0031] Based on the specific implementation method in step S1 above, 4-6 boss connecting pieces 3 are milled at the connection between the part blank 1 and the bushing 2. The arc length and number of boss connecting pieces 3 can be adjusted according to the size of the part.

[0032] After rough machining, the operation of the milling boss connecting piece 3 can effectively release the machining stress of the part, thereby reducing the deformation after the part is cut off, ensuring that the precision dimensions meet the design requirements, and eliminating the need for additional investment in fitter glue for shaping, saving manpower and resources, and reducing processing costs.

[0033] Based on the specific implementation method in step S1 above, the specifications of the taper shank end mill are D3R0Z2*10*D10*90.

[0034] S4, such as Figure 5 As shown, the radial allowance is precision machined into the required size in three steps, with each cut depth being Φ0.1mm. Finally, the precision-machined bushing 2 is cut off from the workpiece blank 1 by a grooving tool along the boss connecting piece 3.

[0035] During finish turning, the outer diameter, chamfer, and end face of bushing 2 are first finished using an external turning tool. Then, the inner hole and chamfer of bushing 2 are finished using an internal turning tool. Finally, the chamfer is finished using an external grooving tool. After multiple tests, it was found that finishing in three stages makes precision dimensional machining more stable and further reduces manual intervention on the machining site.

[0036] Based on the specific implementation method in step S1 above, the specifications of the external turning tool used for precision turning are A55*R0.4*F25, the specifications of the internal turning tool are A55*R0.2*D25, the specifications of the external diameter grooving tool are W4R0.4, and the specifications of the parting tool are W3R0.1.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for reducing deformation during the machining of high-precision bushing parts, characterized in that, Includes the following steps: S1. After clamping the part blank (1), rough machine one end of the part blank (1) to produce the bushing (2). After rough machining, the radial allowance of the precision dimension is Φ0.3mm. S2. Pre-cut the thickness of the connection between the part blank (1) and the bushing (2) to 0.5mm; S3. Using a tapered shank milling cutter with a diameter of D3, mill multiple boss connecting pieces (3) evenly along the circumference of the part blank (1) at the connection between the part blank (1) and the bushing (2). S4. The radial allowance is precision machined into the required size in three steps according to the depth of cut Φ0.1mm each time. Finally, the precision machined bushing (2) is cut off from the workpiece blank (1) by cutting along the boss connecting piece (3) with a cutting tool.

2. The method for reducing machining deformation of high-precision bushing parts according to claim 1, characterized in that: Before rough machining the bushing (2), straighten the outer circle of the part blank (1) located at the outer diameter groove (4) of the bushing (2) to ensure that the runout of the outer circle at the outer diameter groove (4) is less than 0.1mm. At the same time, set the machining zero point at the center of the machining end face of the part blank (1).

3. The method for reducing machining deformation of high-precision bushing parts according to claim 1, characterized in that: When rough turning the bushing (2), first use an external turning tool to rough turn the outer circle, outer chamfer and end face of the bushing (2), then use an internal turning tool to rough turn the inner hole and inner chamfer of the bushing (2), then use an external grooving tool to rough turn and finish turn the outer diameter groove (4) of the bushing (2), then use an internal grooving tool to rough turn and finish turn the inner hole groove (5) of the bushing (2), and finally use a center drill to perform spot drilling and drilling at the outer diameter groove (4) in sequence.

4. The method for reducing machining deformation of high-precision bushing parts according to claim 1, characterized in that: When pre-cutting the connection between the blank (1) and the bushing (2), leave 0.1 mm in the Z direction and 1.5 mm in the X direction.

5. The method for reducing machining deformation of high-precision bushing parts according to claim 4, characterized in that: During finishing, first finish the outer circle, outer chamfer and end face of the bushing (2) with an external turning tool, then finish the inner hole and inner chamfer of the bushing (2) with an internal turning tool, and finally finish the chamfer with an external grooving tool.

Images