Company News

• Two points for attention in selecting HSK tool holder material

  2021 / 05 / 10

  DIN standard only specifies the geometry of HSK toolholder, but not the material used. Therefore, almost all of the HSK toolholders produced by tool suppliers refer to the traditional 7:24 taper shank. The "hollow" of HSK hollow short taper shank itself shows a potential problem: the axial section is very small, which is obviously the weak link of HSK hollow short taper shank. The traditional toolholder is usually made of alloy steel, and then surface hardening or surface treatment is used to obtain a hard and wear-resistant surface and a tough core (hrc32-36). These heat treatment processes (such as carburizing and ion nitriding, hardness can reach HRC58-62, about 1 mm deep) are very suitable for 7:24 taper shank, and the price is not expensive. Because it has enough cross section, it is not easy to deform. According to the guidelines accepted by industry, this relatively stable matrix perfectly integrates the two properties - a soft and tough core, which can prevent the hard surface from cracking and falling off due to deformation, and a very wear-resistant and hard surface. In some parts of HSK toolholder, it is very sensitive to large tensile stress. There are 30 ° The clamping surface, the contact surface between the keyway and the spindle during torque transmission, and the position of the radial through hole closer to the bottom of the keyway and the bottom of the empty tool slot. In fact, it is difficult to find these changes without microscope and special detection means. A toolholder seems to work normally. Once it is overloaded, stress concentration occurs at the crack position, and fracture is likely to occur when it reaches the critical value. This kind of brittle fracture may occur at any time during use.

• Types and characteristics of CNC toolholder:

  2021 / 05 / 06

  CNC machining has strict requirements on the rigidity, accuracy, durability and dynamic balance performance of cutting tools. In the selection of cutting tools, we should pay attention to the analysis of the structure and technology of the workpiece, combined with the processing capacity of CNC machine tools, workpiece materials and process content and other factors. 40Cr is generally used for NC tool holder machining. The commonly used tool handles in NC machining are mainly divided into drilling tool handle, boring tool handle, milling tool handle, thread tool handle and straight tool handle. 1) When machining curved surface parts, in order to ensure that the cutting edge of the cutting tool is tangent to the machining contour at the cutting point, so as to avoid the interference between the cutting edge and the workpiece contour, the ball end cutter is generally used, while the two edge milling cutter is used for rough machining, and the four edge milling cutter is used for semi finish machining and finish machining. 2) When milling large plane, in order to improve the production efficiency and improve the surface roughness, most of them will use insert type disc cutter. 3) As for milling small plane or step surface, most of them use universal milling cutter. 4) When milling keyway, in order to ensure the dimensional accuracy of the groove, generally use two edge keyway milling cutter. 5) When machining holes, drilling tools such as drills can be used.

• Installation method and precautions of spring chuck tool holder

  2021 / 04 / 29

  Before installing the spring collet, be sure to install the clamping spring into the lock nut, and then gently screw the clamping screw cap on the extension rod or the handle. After installing the numerical control blade, you can use a very difficult hand to clamp the capital into the work. In order to achieve good performance index, before installing the spring collet, be sure to clean the part of the external thread, locating surface and spherical surface of the spring collet and lock nut. During the whole installation process of clamping spring, the clamping screw cap must be tilted, and then gently put into the clamping cross section of the clamping screw cap. Common problems of spring chuck handle When the numerical control blade is clamped by the spring chuck handle to carry out drilling production, it is necessary to pay attention to the clamping spring to clamp the numerical control blade, so as to prevent the numerical control blade from flying out at high speed and causing safety production accidents. When the handle of the spring chuck is not in operation, it is forbidden to clamp the spring when installing the numerical control blade. The screw cap should be tightened on the handle or the connecting rod to prevent the deformation and brittle fracture of the spring. The spring chuck toolholder includes the spring chuck used for clamping and positioning tools. Compared with the side fixed end mill toolholder, the spring chuck toolholder is more expensive, but it has better tool clamping and higher precision tool positioning ability. There are three types of spring collets: Er type, DA type (double angle type) and TG type (single angle type or small taper type). A spring chuck is usually only suitable fo