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| REMOVABLE TOP JAW MOUNTING/ROTATING INSTRUCTIONS (1.23MB Adobe .pdf File) |
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| The PROHOLD® hydraulically actuated 4" and 6" vises provide advanced mechanical and ergonomic features not available in any other vise on the market today. These vises are perfect for vertical machining centers. A single vise or a stack, using the common internal hydraulic manifold, can be mounted on a VMC and powered by an external PROHOLD® hydraulic power unit as seen in the setup immediately below. Because the vises are double-acting, or bi-directional in their operation, the jaws are sure to move no matter how much weight may be resting on a moving jaw. The example at the bottom of this page is a perfect situation where spring-return vises did not work. Only a PROHOLD® full hydraulic vise could handle the job effectively. | |||||||||||||||||||||||
 6" Vise Mounted On Vertical Machining Center Powered Hydraulically From External Pump Unit |
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Multiple 6" vises can be stacked side by side and operated individually and powered by the same single pump unit because of the common internal hydraulic manifold built into each vise body. The 6" hydraulic vise has two moving jaws with full 2.5" bi-directional jaw stroke on each jaw (4" vise has 2" bi-directional stroke per jaw), allowing for precise positive clamping inward toward a centrally mounted dead jaw, or outward on dead jaws mounted on each end of the vise. Each moving jaw exerts approximately 6 tons of clamping force at 3800 psi hydraulic pressure (4" vise approximately 3.4 tons at 3800 psi). There is a manual open/close valve and pressure gauge mounted on the front of the vise for individual manual control. For automated control the manual valve can be replaced by a solenoid valve or cross-over plate with a DO3 mounting pattern. Each vise has four internal accumulators and an internal check valve. The internal check valve allows individual vises in a stack of vises to be operated without affecting any other vises in the stack. The vise is made out of a one-piece, flame-hardened and ground 1045 steel body. Quick change top jaws are available with hardened steel inserts or fully machinable soft jaws [aluminum or steel]. The hardened insert jaws are designed so that parts from 0" to 19" can be easily clamped by just rotating the top jaw 180º and/or moving the dead jaw(s) from the center to one end of the vise body through a series of different quick changeable configurations as seen immediately below. |
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| POSSIBLE VISE CONFIGURATIONS WITH STANDARD HARD JAW SET FOR CLAMPING FROM 0-19" LENGTH PARTS |
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| QUICK-MOUNTING FOR TOOLING PLATES | |||||||||||||||||||||||
 6" HYDRAULIC VISE USED FOR MOUNTING TOOLING PLATES WITH MULTIPLE MINI/MICRO CLAMPS OR MODULAR TOOLING COMPONENTS |
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The weight of the vise without jaws is approximately 88 lbs. Overall dimensions are 6.25" wide, 3.125" high, 22.5" long. There is a top cavity cover plate on each vise made out of A2 hardened steel. This cover keeps swarf and chips out of the internal cavity of the vise body. There is a drain on the bottom center of the back cover plate that allows for gravity drainage of fluids. This port can be used to admit a positive air pressure to purge fluids and fine swarf from entering the cavity in application environments like those generating fine cast iron particulate. |
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| INSTALLATION FOR MACHINING HEAVY LONG STOCK & I-BEAMS |
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PROHOLD® hydraulic vise units are capable of full automation or semi-automated as in this application to clamp long steel I-beams or plate. With the flip of a handle the operator can clamp or unclamp three vises simultaneously. The vises are setup at three foot intervals and connected hydraulically by tubing to the pump and valve block on the left side of the machine table. The pump sits behind the machine and runs on demand, feeding the manual valve block manifold. |
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| In this setup each vise has a custom dead jaw in the middle of the vise. Two moving jaws also have custom jaws to accommodate the height of the I-beam material. There are two rows of vises for the A & B loading of the I-beams during machining. | |||||||||||||||||||||||
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| The jawing was specifically made for the I-beam dimensions. The view to the right and those below show the vise being used to clamp four long plates with less width than the I-beams, so a spacer was used to take up the extra travel. | |||||||||||||||||||||||
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| Each vise has 2.5" travel on the moving jaws. The two moving jaws clamp inward against the dead jaw in the middle. For this application, the customer needed the double-acting motion of the vise. Vises with spring return could not do the job because the weight of the materials clamped kept the vises from returning. With the PROHOLD® hydraulic vise, the jaws are hydraulically driven inward as well as outward, under the same force in both directions. There is motion on the moving jaws in both directions until it comes up against a dead stop. | |||||||||||||||||||||||
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The top views show how the plates are clamped against the dead jaw in the middle of the vise body. A total of 4 tons clamping force can be exterted against the material in each vise. These parts are not going anywhere and the operator loves how easy it is to clamp material into position quickly without using a wrench. |
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