NGHIÊN CỨU SỰ THAY ĐỔI NHÁM BỀ MẶT CAM KHI GIA CÔNG TRÊN MÁY ĐÁNH BÓNG BK.CMPM.12

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Thông tin xuất bản: Tạp chí Khoa học & Công nghệ - Trường Đại học Công nghiệp Hà Nội, 2020

Mô tả vật lý: tr.73

Bộ sưu tập: Báo, Tạp chí

ID: 304875

Thêm vào giỏ Liên kết toàn văn

Độ nhám bề mặt chi tiết máy nói chung và trục cam xe máy nói riêng là một trong các thôngsố quan trọng của chất lượng bề mặt gia công. Chất lượng bề mặt ảnh hưởng trực tiếp ma sát,mòn va tuổi thọ của chi tiết cũng như toàn máy. Nghiên cứu, lựa chọn một bộ thông số côngnghệ máy nhằm đạt được chất lượng bề mặt chi tiết tốt nhất luôn được các nhà khoa học quantâm. Bài báo này trình bày kết quả nghiên cứu về độ nhám bề mặt cam, một chỉ tiêu của chấtlượng bề mặt, khi gia công đánh bóng trên máy BK.CMPM.12. Kết quả thực nghiệm cho thấyrằng độ nhám bề mặt Rz giảm so với trước khi gia công đánh bóng lần lượt là: 30,98%, 11,90%,14,75% và 15,04% tương ứng với 04 điểm đo theo chu vi cam, từ điểm đo có lượng nâng lớnnhất theo chiều quay làm việc. Ảnh hưởng của áp lực pháp tuyến khi gia công đánh bóng đến độnhám bề mặt Rz cũng được chỉ ra, theo đó nhám bề mặt tại ví trí cam với lượng nâng lớn nhấtgiảm khoảng 13% so với các vị trí có lượng nâng nhỏ hơn. Giá trị Rz tại 02 vị trí còn lại khác biệtkhông nhiều, chỉ khoảng 2,7%. Điều này cho thấy bộ thông số công nghệ máy đã được lựa chọntrong vùng hợp lý với phương pháp gia công đánh bóng bằng dây đai đính hạt mài.The surface roughness of machine parts in general and motor camshafts in particular is one ofthe important parameters of the surface quality of machining. Surface quality directly affectsfriction, wear and longevity of parts as well as the whole machine. Studying and selecting a set ofmachining technology parameters to achieve the best surface quality of workparts has always beeninterested in scientists. This paper presents the research results of cam surface roughness, which isan indicator of surface quality, when polishing on the machine BK.CMPM.12. Experimental resultsshow that the surface roughness Rz decreases compared to that before polishing, respectively:30.98%, 11.90%, 14.75% and 15.04% corresponding to 04 points measured in the camcircumference, from the measuring point with the largest lobe lift in the direction of rotation. Theinfluence of normal pressure when polishing on surface roughness Rz is also indicated, whereby theroughness at the cam position with the largest lift decreases about 13% compared to that of thepositions with smaller lift. The value of Rz in the remaining 2 locations is not much different, onlyabout 2.7%. This shows that the machining technology parameters, which has been selected, is in areasonable region with the method of polishing by abrasive belt.

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