Mòn dụng cụ căt ánh hướng đen rung động và nhám bề mặt khi tiện

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Tác giả: Lưu Thủy Chung ThS., Lê Thái Sơn TS.

Ngôn ngữ: Vie

Ký hiệu phân loại: 671 Metalworking processes and primary metal products

Thông tin xuất bản: Cơ khí Việt Nam 2022

Mô tả vật lý: 143-150

Bộ sưu tập: Metadata

ID: 395548

Thêm vào giỏ Liên kết toàn văn

Trong gia công cắt gọt, mòn dụng cụ cắt ánh hưởng lớn đến chất ỉượng bê mặt chi tiết cũng như năng suất gia công. Bài bảo này trình bày phương pháp xác định ỉượng mòn, tuôi bên của dụng cụ cat và chất lượng bề mặt chi tiết gia công thòng qua việc kiêm soát các thông sô rung động cùa dụng cụ. Trong quá trình thí nghiệm, sau môi lượt căt khoảng 3 phút, tiên hành dừng máy và xác định lượng mòn, độ nhảm bề mặt của dụng cụ, đồng thời rung động của dao được thu thập về máy tinh theo thời gian gia công đe tiến hành phân tích. Kết quả cho thấy, ở giai đoạn mòn ban đầu, dụng cụ bị mòn nhanh, độ nhám bề mặt cao, các thông so rung không on định. Sau một khoáng thời gian gia công, lương mòn dụng cụ ôn định, độ nhám bê mặt thấp và các thông số rung cũng ôn định. Sau đó, lượng mòn tăng nhanh, đồng thời các thông sô rung tăng nhanh. Các két quả này cho phép khăng định các thông số rung của dụng cụ cắt (vận tốc, gia tốc và biên độ rung) phản ánh chính xác ba giai đoạn mòn điên hỉnh của dụng cụ, đồng thời phán ánh được độ nhảm bể mặt chi tiết. Đây là phương án đảnh giá, kiêm soát tuôi bén dụng cụ cỏ chi phí đâu tư nhỏ, đơn gián hơn so với việc sử dụng cảm biến lực xác định tuôi bền của dụng cụ hiện nay., Tóm tắt tiếng anh, In machining, the wear of the cutting tool greatly affects the surface quality of the part as ivell as the machining productivity. This paper presents a method to determine the wear amount, durability, and surface quality of cutting tools through controlling the vibration parameters of the tool. During the experiment, about 3 minutes after each cut, stop the machine and determine the amount of wear, the surface roughness of the tool, and the vibration of the tool is collected to the computer according to the machining time to proceed analysis practice. The residts show that, at the initial wear stage, the tool wears out quickly, the surface roughness is high, and the vibration parameters are unstable. After a period of machining, the tool wear is stable, the surface roughness is low, and the vibration parameters are also stable. After that, the amount of wear increases rapidly, and at the same time, the vibration parameters increase rapidly. These results allow confirming that the vibration parameters of the cutting tool (velocity, acceleration, and vibration amplitude) accurately reflect the three typical wear stages of the tool, while also reflecting the surface roughnessdetails. This is a method of evaluating and controlling tool life with a small investment cost, simpler than using force sensors to determine the durability of current tools.

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