การศึกษาอิทธิพลของตัวแปรการเจียระไนที่มีผลต่อความแข็งและโครงสร้างของผิวชิ้นงานที่ผ่านการตีขึ้นรูปร้อน
Study the Effect of Grinding Parameter on the Surface Hardness and Structure of the Hot Forged Product
Abstract
งานวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาตัวแปรที่มีอิทธิพลในกระบวนการเจียระไนแบบสายพานที่ส่งผลกระทบต่อความแข็งผิววัสดุโลหะเหล็กเกรด S45C ที่ผ่านการตีขึ้นรูปร้อนและผ่านการอบชุบทางความร้อน โดยใช้การออกแบบการทดลองเพื่อหาปัจจัยที่มีนัยสำคัญ ปัจจัยที่นำมา 4 ปัจจัย ขนาดพื้นที่หน้าตัดชิ้นงานแรงกดชิ้นงานจากการถ่วงน้ำหนักดันป้อนชิ้นงานช่วงระยะเวลาในการเจียระไน และสภาพของผ้าทรายสายพานรวมถึงขนาดเบอร์ของผ้าทรายสายพาน จากค่าความแข็งผิวชิ้นงานที่ตรวจสอบก่อนการทดลองอยู่ระหว่าง 20–26 HRC ผลจากการทดลองพบว่า ค่าความแข็งผิวชิ้นงานที่เปลี่ยนแปลงจากเดิมเพิ่มมากขึ้นเกิน 26 HRC จากผลกระทบปัจจัยที่มีนัยสำคัญทั้งหมด 3 ปัจจัย นำสู่การวิเคราะห์หาตัวแปรที่ส่งผลกระทบต่อความแข็งผิววัสดุ ได้รับอิทธิพลจากผ้าทรายสายพานที่สึกหรอจนหมดสภาพการตัดเฉือนผิววัสดุส่งผลกระทบให้วัสดุได้รับความเค้น ซึ่งความเค้นนั้นมีความสัมพันธ์กับความแข็งผิววัสดุ
This research aims to investigate how the surface hardness of S45C metal, which has been hot-forged and heat-treated, is affected by the parameters of the abrasive belt grinding process. The experiment was designed using the Design of Experiments (DOE) method to identify significant factors. Four factors were analyzed: the cross-sectional area, the weight applied to the specimens, the grinding duration, and the abrasive belt stages, including the size of the abrasive grains. Initially, the surface hardness of the specimens was measured between 20–26 HRC. The results showed that the surface hardness of the specimens increased to over 26 HRC. As a result, the experiment identified three significant factors that influence the surface hardness of the material. It was found that as the abrasive belt wore down and became completely flat, it affected the stress applied during the experiment. Consequently, the research sought to examine the stress associated with hard materials.
Keywords
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DOI: 10.14416/j.kmutnb.2024.11.001
ISSN: 2985-2145
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