tailieunhanh - mechanical fixtures tooling Episode 8

Tham khảo tài liệu 'mechanical fixtures tooling episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 851-853 hi 351 Turning N with a wrench actuates pinion F and gear c. Gear c rotates rocker arm K which causes the springs on shaft J to rotate arms A and G. The shafts of A and G actuate cams which in turn actuate the damps. Note how shaft J allows the springs to prevent an excessive amount of damping pressure. O M P is the toggle linkage. N 4-i-L 7 I I II Automatic Clamp Spring-Loaded Toggle Link Allows spring loading of damp-1 852 A cam holds the toggle link in clamping position until the unclamping action begins. The two springloaded buttons prevent overdarnping. 853 m TO UNCLAMP y g trSJ-dZS STOP Automatic Clamp Toggle Link CAM OPERATED Automatic Clamp Spring-Loaded Toggle Link Nafe clearances Ị for c and D. STOP F H K and G J K are in fine for toggle clamping 854-85Ố 854 ECCENTRIC CLAMP NOTE TRIPPING DEVICE J STRONG SPRING 77 e tripping dey ce is operated by a cylinder. If the cylinder fails the cỉơmp will hold because ft is mechanical This fs good automatic design. ĩ UNCLAMP CLAMP Ị 7777777777777777777 Automate Clamp Spring-Loaded Toggle Link 856 f Corn unclamps In the clamping operation cam A of post c moves and locks jack B while E raises and locks jack D. In the unclamping operation A moves upward unclamping B and cam G forces F of E to unclamp D. Note the three airvents Automatic Clamp Double Jack Wedge cam 8 raises and Its small clamp angle locks clamp post A Spring-loaded cam c actuates and locks pusher D. The pin limits the upward movement of A and prevents c from turning. Automatic Clamp Toe and Pusher ị 2 5 SB raj as y 857 As cam F pulls E down shoulder G frees expander D enabling the spring to force D to spread the two jaws that .lock the two jacks c. As clamp A is rotated into clamping position by B It is pulled down by E and bolt H to clamp two parts. A -C- c .11 lb Ị ị 858 A 5 This fixture is designed to machine two parts simultaneously. Followers E move A inward as cam r is rotated by H. Clamp J is tightened after it contacts the part by .