Method for optimizing high-precision boring machining process of thin-wall steel pipe part

Abstract

The invention relates to an optimization method of a high-precision boring machining process for a thin-wall steel pipe part. The method comprises the following steps: step 1, determining cutter parameters; step 2, selecting a proper cooling liquid; and step 3, controlling the cutting amount. Through cutter parameter optimization, cooling liquid selection and cutting amount adjustment and in combination with clamping force control, the boring precision of the thin-wall steel pipe part is remarkably improved, deformation in the machining process is reduced, and the product quality is improved.

Description

Technical Field

[0001] This invention relates to an optimization method, specifically an optimization method for high-precision boring of thin-walled steel pipe parts, belonging to the field of machining technology. Background Technology

[0002] Thin-walled steel pipe parts are prone to deformation during machining, affecting machining accuracy and product quality. This is especially true in boring operations, where selecting appropriate tool parameters, coolant, and cutting parameters is crucial. The steel pipes used by Meishan Mining have a wall thickness of only δ4.5, and their inherent rigidity cannot withstand the forces generated during relatively high-speed cutting, resulting in elastic deformation and vibration. To complete the machining, the rotation speed, feed rate, and depth of cut must be reduced during boring to avoid vibration. However, this leads to the surface finish failing to meet the specified roughness requirements. In traditional machining processes, the selection of tool parameters, the application of coolant, and the determination of cutting parameters significantly impact machining quality and efficiency. However, existing technologies suffer from problems such as workpiece deformation, high surface roughness, and low machining efficiency. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a high-precision boring process and parameter optimization method for thin-walled steel pipe parts, solving the deformation problem that easily occurs during processing and improving processing accuracy.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: an optimized method for high-precision boring of thin-walled steel pipe parts, the specific method of which is as follows:

[0005] Step 1: Determining the tool parameters. Determining the tool parameters is crucial for machining quality and efficiency. Appropriate tool angle selection can reduce workpiece deformation. Through repeated practice, the boring tool used is YT15 with an R-shaped coiled pin groove, a principal rake angle of 25°–30°, a principal clearance angle of 6°–10°, a principal cutting edge angle of 91°–93°, a secondary cutting edge angle of 6°–8°, and a cutting edge inclination angle of 0°–3°. Finally, the tool tip needs to be deburred using an oilstone. The snap ring groove tool used is an HSS high-speed steel turning tool (W18Cr4V), with an R-shaped coiled pin groove of 3–5 mm, a principal rake angle of 20–25°, a principal clearance angle of 8°–12°, and a cutting edge inclination angle of 0°–1°.

[0006] Step 2: Select a suitable coolant. To ensure the quality of the machined surface of the product, diesel is selected as the coolant and lubricant. This can reduce the surface roughness of the workpiece and remove some of the heat generated during cutting, thus cooling the workpiece and preventing it from deforming due to heat.

[0007] Step 3: Control the cutting parameters. Through repeated practice, the optimal feed rate for boring is 0.15–0.20 mm / r, the depth of cut is 1–1.3 mm, and the cutting speed is below 120 m / min. Machining the workpiece under these parameters effectively reduces deformation caused by tool vibration during cutting and its impact on surface roughness. Additionally, the average wall thickness of the support cylinder is only 4.5–5 mm, and after boring, the wall thickness is 3–3.3 mm. Care must be taken to control the clamping force during clamping. Excessive clamping force can cause deformation of the steel pipe, and may also lead to unnecessary movement or vibration, thus affecting machining accuracy and surface quality. The solution is to loosen most of the clamping force on the rough boring jaws before finish boring. When determining the clamping force, the ideal force should be as small as possible to ensure machining quality and safety.

[0008] Compared with the prior art, the present invention has the following advantages: by optimizing tool parameters, selecting coolant and adjusting cutting parameters, and combining clamping force control, the present invention significantly improves the accuracy of boring of thin-walled steel pipe parts, reduces deformation during the machining process, and improves product quality. Detailed Implementation

[0009] To enhance understanding of the present invention, detailed descriptions are provided below in conjunction with embodiments.

[0010] Example 1: An optimization method for high-precision boring of thin-walled steel pipe parts, which involves optimizing tool parameters, selecting a suitable coolant, selecting reasonable cutting parameters, and controlling clamping force.

[0011] (1) Boring tool system: The R-shaped chip groove design is adopted, and the tool tip is ground with an oilstone to remove micro-burrs. This ensures efficient and high-precision boring of thin-walled support cylinder materials; the R-shaped chip groove facilitates chip curling and discharge, reducing chip scratches on the machined surface; the deburring treatment of the tool tip can improve the surface finish and dimensional accuracy of the hole, and extend the tool's durability.

[0012] (2) Cooling and lubrication scheme: Coolant is supplied to the entire machining area continuously. This effectively reduces the temperature of the cutting area, reduces workpiece thermal deformation, and thus ensures machining accuracy; at the same time, it also acts as a lubricant, reduces the surface roughness of the machined workpiece, and removes chips in a timely manner.

[0013] (3) Boring process parameters: The optimized combination of cutting parameters for boring thin-walled support cylinders ensures that cutting force and cutting heat are controlled while removing the allowance. Under the premise of ensuring the surface quality and dimensional accuracy of the boring hole, a high material removal rate is achieved, while avoiding deformation or burning of thin-walled workpieces due to excessive cutting force or cutting heat.

[0014] (4) Workpiece clamping and deformation control: A clamping method that controls the clamping force is adopted to avoid applying excessive radial clamping force to the workpiece. This ensures the geometric accuracy and dimensional stability of the thin-walled support cylinder during the boring process, effectively prevents workpiece deformation caused by improper clamping or cutting force, and ensures the uniformity and accuracy of the final wall thickness.

[0015] The specific method is as follows:

[0016] Step 1: Determining the tool parameters. Determining the tool parameters is crucial for machining quality and efficiency. Appropriate tool angle selection can reduce workpiece deformation. Through repeated practice, the boring tool used is YT15 with an R-shaped coiled pin groove, a principal rake angle of 25°–30°, a principal clearance angle of 6°–10°, a principal cutting edge angle of 91°–93°, a secondary cutting edge angle of 6°–8°, and a cutting edge inclination angle of 0°–3°. Finally, the tool tip needs to be deburred using an oilstone. The snap ring groove tool used is an HSS high-speed steel turning tool (W18Cr4V), with an R-shaped coiled pin groove of 3–5 mm, a principal rake angle of 20–25°, a principal clearance angle of 8°–12°, and a cutting edge inclination angle of 0°–1°.

[0017] Step 2: Select a suitable coolant. To ensure the quality of the machined surface of the product, diesel is selected as the coolant and lubricant. This can reduce the surface roughness of the workpiece and remove some of the heat generated during cutting, thus cooling the workpiece and preventing it from deforming due to heat.

[0018] Step 3: Control the cutting parameters. Through repeated practice, the optimal feed rate for boring is 0.15–0.20 mm / r, the depth of cut is 1–1.3 mm, and the cutting speed is below 120 m / min. Machining the workpiece under these parameters effectively reduces deformation caused by tool vibration during cutting and its impact on surface roughness. Additionally, the average wall thickness of the support cylinder is only 4.5–5 mm, and after boring, the wall thickness is 3–3.3 mm. Care must be taken to control the clamping force during clamping. Excessive clamping force can cause deformation of the steel pipe, and may also lead to unnecessary movement or vibration, thus affecting machining accuracy and surface quality. The solution is to loosen most of the clamping force on the rough boring jaws before finish boring. When determining the clamping force, the ideal force should be as small as possible to ensure machining quality and safety.

[0019] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. An optimized method for high-precision boring of thin-walled steel pipe parts, characterized in that, The method includes the following steps: Step 1: Determining the tool parameters. Step 2: Select a suitable coolant. Step 3: Control the cutting parameters.

2. The method for optimizing the high-precision boring process of thin-walled steel pipe parts according to claim 1, characterized in that, Step 1: Determining the tool parameters, as detailed below. The boring tool uses YT15 with an R-shaped coiled pin groove, a main rake angle of 25°~30°, a main clearance angle of 6°~10°, a main cutting edge angle of 91~93°, a secondary cutting edge angle of 6°~8°, and a cutting edge inclination angle of 0°~3°. Finally, the tool tip needs to be deburred with an oilstone. The retaining ring groove tool uses an HSS high-speed steel turning tool (W18Cr4V), with an R-shaped coiled pin groove of 3~5mm, a main rake angle of 20~25°, a main clearance angle of 8°~12°, and a cutting edge inclination angle of 0°~1°.

3. The method for optimizing the high-precision boring process of thin-walled steel pipe parts according to claim 1, characterized in that, In step 2, diesel fuel is selected as the cooling and lubricating fluid.

4. The method for optimizing the high-precision boring process of thin-walled steel pipe parts according to claim 1, characterized in that, Step 3: Control the cutting parameters, as follows: When boring, select a feed rate of 0.15–0.20 mm / r, a depth of cut of 1–1.3 mm, and a cutting speed below 120 m / min. Machining the workpiece under these cutting parameters effectively reduces the deformation caused by tool vibration during the cutting process and its impact on surface roughness.