Flat-nose pliers, also known as machine vises, are a common machine tool, mainly used in large and medium-sized milling machines, drilling machines, surface grinders and other mechanical equipment. Because flat-nose pliers are easy to use, they are an indispensable auxiliary mechanical equipment.
How Does It Work?
The working principle of flat-nose pliers is to use a wrench to turn the lead screw, and the lead screw nut drives the movable pliers to move, thereby tightening and loosening the workpiece. The size of the clamped workpiece must not exceed 70 mm. The assembly structure of the flat-nose pliers is a detachable threaded connection and a pin connection; the linear motion of the movable pliers is converted from a spiral motion; the working surface is the friction surface of the spiral pair, the guide pair, and the shaft and hole with clearance fit.
How To Install Flat-nose Pliers?
When installing a machine flat-nose pliers and aligning the fixed jaws, the bottom surface of the pliers seat and the milling machine worktable should be wiped clean. Generally, the machine flat-nose pliers should be located to the left of the center of the CNC lathe milling machine worktable. When processing general workpieces on a CNC lathe, place the positioning key on the base of the machine flat-nose pliers into the central T-slot of the worktable, then fix the pliers seat, and then rotate the pliers body according to the engraved lines on the base so that the fixed jaw plane is parallel or perpendicular to the milling machine spindle axis, or it can be adjusted to the required angle.
After the machine flat-nose pliers are installed, the fixed jaws should be aligned. The alignment methods are as follows:
1. Use a stylus to align the fixed jaws and the milling machine spindle axis. When processing longer workpieces, the fixed jaws can be installed perpendicular to the milling machine spindle axis. Usually, a stylus can be used for alignment. When aligning a CNC lathe, clamp the stylus between the tool bar washers so that the stylus tip is close to the fixed jaw plane, move the workbench longitudinally, and observe the size of the gap between the stylus tip and the fixed jaw plane. If they are consistent over the entire length of the jaws, the fixed jaw plane is perpendicular to the milling machine spindle axis. Then tighten the pliers body and check it.
2. Use a right-angle ruler to align the fixed jaws and the milling machine spindle axis parallel to the milling machine spindle axis. When processing shorter workpieces, the milling cutter can mill out the entire plane in one go, or when the processed part is required to be perpendicular to the reference plane, the fixed jaws of the machine flat-nose pliers should be installed parallel to the spindle axis. At this time, a right-angle ruler can be used to align the fixed jaws of the CNC lathe. When aligning, loosen the clamp body fastening nut to make the fixed jaw plane roughly parallel to the spindle axis, hold the square ruler, make the bottom surface of the ruler seat close to the vertical guide surface of the bed, adjust the clamp body appropriately, make the fixed jaw plane fit closely with the outer measuring surface of the square ruler, and then tighten the clamp body, and then check.
3. Use the indicator to align the fixed jaw with the CNC lathe and milling machine spindle axis perpendicular or parallel. When processing more precise workpieces, the indicator can be used to align the fixed jaw. When aligning, suck the magnetic table seat on the crossbeam guide surface, install the indicator, make the table's measuring rod perpendicular to the fixed jaw plane, make the table's probe contact the jaw plane, compress the measuring rod 0 3~0 4mm, move the workbench longitudinally, observe the table reading, and if it is consistent within the full length of the jaw, the fixed jaw is perpendicular to the spindle axis of the milling machine.
After the CNC lathe alignment meets the requirements, gently tighten the clamp body and check it. After passing the inspection, tighten the clamp body with force. When using the indicator to align the fixed jaws to be parallel to the spindle axis of the milling machine, suck the magnetic base onto the vertical guide surface of the bed and move the workbench horizontally for alignment.
How To Maintain The Flat-nose Pliers?
Flat-nose pliers are easy to operate and can be used skillfully by most workers. However, they are not well maintained, which leads to excessive losses and affects their service life.
How to properly maintain the flat-nose pliers is as follows:
1. Before use, the bottom of the flat-nose pliers and the workbench must be cleaned.
2. Align the keyway with the groove and place it on the workbench.
3. Lightly lock the hydraulic vise with the screw group. Note: The default value of the screw group is the 18mm table with grooves.
4. After the fixed jaw plate is calibrated as the correction surface, the screw lock plate can be used.
5. Check the oil level in the cylinder regularly. Note: At least once every 6 months.
6. It is strictly forbidden to hit the handle with a hammer or other workpiece.
7. Be careful not to open the vise opening excessively.
8. Use 140 or other similar engine oil, and do not allow air to enter the hydraulic cylinder.
