Company News

• Common problems of CNC machining center

  2021 / 04 / 06

  We know that in the process of deep hole machining in CNC machining center, there are often problems such as the dimensional accuracy, surface quality and tool life of the machined parts. How to reduce or even avoid these problems is an urgent problem to be solved. The following summarizes several common problems and solutions in deep hole machining. 1. The aperture increases and the error is large 1) Causes The results show that the design value of the outer diameter of the reamer is too large or the reaming cutting edge has burr; the cutting speed is too high; the feed rate is improper or the machining allowance is too large; the main deflection angle of the reamer is too large; the reamer is bent; the chip lump is adhered on the reaming cutting edge; the swing error of the reaming cutting edge is out of tolerance during grinding; the selection of cutting fluid is inappropriate; the oil stain on the taper shank surface is not cleaned or the taper surface is bumped when the reamer is installed; After the flat tail of the taper shank is installed into the spindle of the machine tool, the taper of the taper shank interferes; the spindle is bent or the bearing of the spindle is too loose or damaged; the reamer floats inflexibly; different from the workpiece, the force of the two hands is not uniform when reaming the shaft and hand, which makes the reamer shake left and right. 2) Solutions According to the specific situation, reduce the outer diameter of the reamer; reduce the cutting speed; adjust the feed rate or reduce the machining allowance properly; reduce

• Characteristics of BT, SK and HSK toolholders

  2021 / 03 / 17

  When a certain holding force is applied to HSK or cat / SK / BT, the stability of HSK in the radial direction is five times or even higher than that of cat / SK / BT, as follows. Therefore, compared with cat / SK / BT, HSK's high radial stability makes it more suitable for heavy cutting, high feed milling and hole lining. In addition, the radial stability also helps to improve the overall rigidity. The higher the rigidity of the whole cutting system, the higher its internal natural frequency will be. Therefore, it helps to reduce the occurrence of natural resonance under high-speed rotation, so that the HSK toolholder is suitable for higher speed. In addition, high stability and rigidity can reduce the occurrence of vibration, so it is more suitable for high-precision machining and finishing. In addition, HSK has a protruding edge which can make axial contact with the spindle, so its axial rigidity in the spindle direction can ensure that it is kept at a fixed point when lining holes or holes. In addition, the axial holding force of HSK is twice that of cat / SK / BT, and because of the 1:10 taper and high friction of HSK, it will lead to a self-locking effect. Therefore, the holding power of HSK is obviously higher than that of cat / SK / BT. 2. Torsion HSK is designed with two areas to generate friction, so its torque transmission will be higher than BT / sk. The first area is the contact surface between the spindle and the toolholder; the second area is the clamping surface of the toolholder and the deformable part of the spindle clamping mechanism. When using HSK system, there are three options to meet the need of torque: Type A and type C toolholders are

• What are the inspection standards of knife handle

  2021 / 03 / 08

  The tool handle is the link between the machine tool and the tool. For the toolholder, there are many parameters to be tested, but the most important parameters are the taper angle of the toolholder and the circular runout of the toolholder. Shenganbei toolholder manufacturers offer a variety of toolholder types, each with excellent performance in specific machining applications. Therefore, it is suggested that the tool holder should be selected according to the specific process and parts. The tool handle is the link between the machine tool and the tool. For the toolholder, there are many parameters to be tested, but the most important parameters are the taper angle of the toolholder and the circular runout of the toolholder. 1. Taper tolerance of taper part of toolholder In the standard of taper tolerance, strict tolerance grade is used to limit and guarantee the accuracy of the big and small end diameter, taper length and taper of the toolholder. The taper accuracy of the tool is a necessary condition to ensure the close combination of the taper surface of the tool handle and the spindle wall of the machine tool. It can effectively prevent and absorb the vibration and resistance generated in the cutting process, and make the cutting force of each part of the tool uniform, so as to greatly improve the service life of the main shaft and tool of the machine tool, and improve the surface roughness of the workpiece. 2. Circular runout of the tool holder part of the handle Another important inspection parameter of the toolholder is the circular runout of the toolholder. It is usually me