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Chia sẻ: Tài Huệ | Ngày: 19/02/2024 | Lượt xem: 89 | Lượt tải: 0
Tóm tắt tài liệu Bài giảng Công nghệ gia công áp lực - Chương 3: Công nghệ dập tấm - Lê Trung Kiên, để xem tài liệu hoàn chỉnh bạn click vào nút DOWNLOAD ở trên
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3.2 Các nguyên công cắt
Những nguyên công cắt đ−ợc sử dụng rộng rãi trong dập tấm nguội, có thể cắt thép
tấm cán hoặc thép cuộn thμnh những băng hoặc dải, cắt những thép tấm cán tiêu
chuẩn thμnh những phôi khác nhau, cắt hình để nhận đ−ợc các loại chi tiết phẳng có
hình dạng khác nhau, hoặc cắt phôi tr−ớc khi dập các chi tiết không gian, rỗng v.v...
Phân loại các ph−ơng pháp cắt :
- Cắt vật liệu tấm bằng máy cắt dao song song
- Cắt vật liệu tấm bằng máy cắt dao nghiêng
- Cắt vật liệu tấm bằng máy cắt dao đĩa
- Cắt vật liệu tấm bằng khuôn
- Cắt kim loại bằng các ph−ơng pháp đặc biệt nh− cắt bằng khuôn cao su hay cắt
hình đột lỗ bằng chất nổ
Sơ đồ cắt
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Ví dụ Dập vuốt các chi tiết cốc
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Ví dụ Dập vuốt chi tiết hộp
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Ví dụ Dập vuốt phức tạp (vỏ ô tô)
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Placing the blank
Closing the blankholder
Movement of the punch
Deep Drawing
Ejection of the
workpiece
Le_0219a_ba
QÚA TRèNH DẬP VUỐT
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Miết cú biến mỏng
Miết khối
Miết tấm
TỔNG QUAN VỀ PHƯƠNG PHÁP MIẾT
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Phụi
Chặn giữ phụiCon lăn miếtTrục nũng
Trục chớnh dẫn động
Đối ỏp đỡ phụi
3.8.2. MIẾT TẤM KHễNG BIẾN MỎNG
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ẫp chảy thuận
Knock out
Bottom
punch
PunchWork-
piece
ẫp chảy ngược
Konock out
+ bottom punch
Punch
Workpiece
Extrusion
die
3.9. NGUYấN CễNG ẫP CHẢY
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ẫp chảy ngang
Mandrel
Bottom
punch
Workpiece
Extrusion
die
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