Thứ Tư, 26 tháng 1, 2022

Giới thiệu Máy tiện cơ khí 16 loại Máy tiện kim loại

 

Giới thiệu Máy tiện cơ khí 16 loại Máy tiện kim loại

Máy tiện là gì, các loại Máy tiện kim loại phổ biến hiện nay

giới thiệu Máy tiện kim loại? công dụng của Máy tiện kim loại, nguyên lý hoạt động của Máy tiện.

Đối với Sinh viên nghành cơ khí Trong các Trường Đại Học, Cao Đẳng, Trung Cấp Kỹ Thuật khi nhập môn cắt gọt kim loại, các sinh viên cơ khí phải tìm hiểu về nguyên lý máy, nguyên lý cắt gọt kim loại và cần thiết là phải nắm rõ các kiến thức về các loại máy cắt gọt kim loại, các loại máy tiện cơ khí trong đó có Máy tiện kim loại, vậy Máy tiện là gì? Máy tiện cơ khí có công dụng gì? Nguyên lý làm việc của Máy tiện cơ khí như thế nào?

Máy tiện là gì? Máy tiện cơ khí là một loại máy gia công làm việc theo nguyên lý chuyển động quay tròn xung quanh tâm của phôi để thực hiện các hoạt động khác nhau: chà nhám, khoan, cắt, gõ…

Máy tiện cơ khí có công dụng gì? Hiện nay, Máy tiện cơ khí được ứng dụng phổ biến trong gia công - kéo sợi kim loại, phun nhiệt, chế biến gỗ và gia công kính… Bên cạnh đó, Máy tiện còn được sử dụng để định hình đồ gốm với bánh xe thợ gốm. Các khối tròn xoay, bề mặt phẳng, xoắn ốc hay ren cũng có thể được tạo ra bởi Máy tiện cơ khí gia công kim loại nếu tích hợp trang bị phù hợp. Còn dòng Máy tiện cơ khí trang trí vẫn có khả năng tạo ra vật rắn 3 chiều có độ phức tạp cao.

Theo nguyên liệu đã chế biến

Máy tiện kim loại chế biến gỗ

Máy tiện cắt kim loại

Xe cắt kim loại tương tự như xe gia công gỗ ở chỗ nó được dùng để cắt phôi bằng cách xoay phôi tiếp xúc với dụng cụ.

Tuy nhiên, sự khác biệt giữa hai cũng rất lớn:

Cấu tạo của giá đỡ dao khác nhau. Xe chế biến gỗ linh hoạt hơn. Ví dụ, sử dụng Máy tiện cắt kim loại để lái một chiếc bình, việc di chuyển dụng cụ để tạo hình nó có thể bất tiện.

Bản chất của phôi là khác nhau. Phôi của phương tiện gia công kim loại nói chung là đồng nhất, về cơ bản vẫn giữ nguyên mật độ và độ cứng, vì vậy nó có thể được cắt 3mm tại một thời điểm và công cụ có thể tự động di chuyển. xem them Nếu gỗ được sử dụng theo cách này, gỗ sẽ bị kích thích và thậm chí gỗ sẽ bị rách. Xe cắt kim loại bằng gỗ cứng thì tốt hơn.

Các công cụ quay khác nhau. Lưỡi cắt của dụng cụ tiện không cùng góc.

Phân loại theo loại cơ bản của các bộ phận được gia công

Máy tiện kim loại CNC kiểu chuck

Các Máy tiện này không có ụ và thích hợp để quay đĩa (kể cả trục ngắn). Hầu hết các phương pháp kẹp là điều khiển điện hoặc thủy lực, và cấu trúc mâm cặp có nhiều hàm điều chỉnh hoặc hàm không dập tắt (tức là hàm mềm).

Máy tiện kim loại CNC hàng đầu

Những chiếc Máy tiện này được trang bị với một ụ thông thường hoặc ụ CNC. Chúng thích hợp để tiện các bộ phận dài và các bộ phận đĩa có đường kính nhỏ.

Ngoài ra, nó có thể khác nhau tùy theo độ chính xác xử lý của nó

Máy tiện kim loại được chia thành Máy tiện kim loại đại cương, Máy tiện cơ khí chính xác và Máy tiện cơ khí chính xác cao. Máy tiện kim loại chính xác và độ chính xác cao thường dựa trên Máy tiện cơ khí chính xác thông thường. Bằng cách cải thiện độ chính xác hình học của máy, giảm ảnh hưởng của rung động và nguồn nhiệt, đồng thời sử dụng các ổ trục hiệu suất cao, máy có độ chính xác gia công cao.

Nếu có thắc mắc gì, vui lòng liên hệ với chúng tôi.

Thứ Ba, 25 tháng 1, 2022

WHO lo ngại biến chủng trong tương lai lây nhanh hơn Omicron

WHO lo ngại biến chủng trong tương lai lây nhanh hơn Omicron

WHO cho biết biến chủng tiếp theo của nCoV có thể lây lan nhanh hơn Omicron, nhưng chưa rõ nó có nguy hiểm hơn hay không.

"Chúng tôi lo ngại biến chủng tiếp theo sẽ dễ lây lan hơn vì nó phải vượt qua các biến chủng đang lưu hành. Câu hỏi lớn là liệu các biến chủng trong tương lai có gây bệnh nặng hơn không", Maria Van Kerkhove, trưởng nhóm kỹ thuật của Tổ chức Y tế Thế giới (WHO), cho biết trong buổi trả lời trực tuyến với truyền thông hôm 25/1.

Khoảng 21 triệu ca Covid-19 được báo cáo cho WHO tuần trước, mức tăng kỷ lục toàn cầu về ca nhiễm hàng tuần do biến chủng Omicron lây lan nhanh chóng. Omicron dường như ít độc lực hơn các chủng trước đó, nhưng lây lan nhanh, dẫn đến số lượng lớn ca nhiễm đang đè nặng lên các hệ thống bệnh viện trên toàn thế giới.

Nhân viên y tế lấy mẫu xét nghiệm Covid-19 cho người dân ở thành phố Ahmedabad, bang Gujarat, Ấn Độ hôm 25/1. Ảnh: AFP.

Nhân viên y tế lấy mẫu xét nghiệm Covid-19 cho người dân ở thành phố Ahmedabad, bang Gujarat, Ấn Độ hôm 25/1. Ảnh: AFP.

Kerkhove cảnh báo không nên hoàn toàn tin tưởng vào giả thuyết virus sẽ tiếp tục biến đổi thành các chủng nhẹ hơn, khiến mọi người ít đổ bệnh hơn các biến chủng trước đó.

"Không có gì đảm bảo điều đó. Chúng ta hy vọng tình huống này sẽ xảy ra, nhưng không có gì đảm bảo và chúng ta không thể tin tưởng vào điều đó", bà nói, lưu ý rằng mọi người nên chú ý đến các biện pháp an toàn công cộng trong thời gian chờ đợi. Hơn nữa, biến chủng mới có thể tăng khả năng né vaccine, khiến các loại vaccine hiện có kém hiệu quả hơn.

Pfizer/BioNTech hôm 25/1 bắt đầu thử nghiệm vaccine đặc trị Omicron vì lo ngại mũi tiêm hiện tại không thể ngăn lây nhiễm và ca nhẹ. Trung tâm Kiểm soát và Phòng ngừa Dịch bệnh Mỹ tuần trước công bố nghiên cứu cho thấy mũi tăng cường Pfizer hiệu quả 90% trong ngăn ngừa nhập viện do Omicron sau 14 ngày.

Mũi tăng cường cũng hiệu quả lên tới 75% trong ngăn ngừa ca nhiễm có triệu chứng do Omicron 2-4 tuần sau khi tiêm mũi thứ ba, theo dữ liệu từ Cơ quan An ninh Y tế Anh đầu tháng này. Tuy nhiên, nghiên cứu phát hiện kháng thể suy yếu sau khoảng 10 tuần, chỉ hiệu quả 45%-50% trong ngăn ca có triệu chứng.

WHO cho biết Omicron dường như đã đạt đỉnh ở một số quốc gia, nhưng tiếp tục lây lan ở nhiều nước khác. "Mọi người sẽ không cần phải đeo khẩu trang và duy trì khoảng cách mãi, nhưng hiện tại chúng ta cần tiếp tục thực hiện điều này", Van Kerkhove nói.

Tiến sĩ Mike Ryan, giám đốc các chương trình khẩn cấp của WHO, cho biết virus sẽ tiếp tục phát triển trước khi lắng xuống. Ông hy vọng virus sẽ lắng xuống mức độ lây truyền thấp, có thể trở nên theo mùa hoặc chỉ ảnh hưởng các nhóm dễ bị tổn thương.

Tuy nhiên, vấn đề là Covid-19 không thể đoán trước được. "Thực tế chứng minh virus mang đến một số bất ngờ khó chịu", ông nói, đồng thời kêu gọi quan chức y tế thế giới tiếp tục theo dõi Covid-19 và sẵn sàng ứng phó để ngăn biến chủng mới gây thêm bất kỳ thiệt hại nào.

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