With the popularity of applications and CNC machining to high-speed, high-precision direction, the clamping tool on the petiole make high demands on the system, the traditional tool clamping methods can not meet the new requirements as a constraint to play tool performance bottleneck. To this end, recent years have developed a number of foreign high precision clamping, transmission torque, good structure symmetry, the small dimensions of new cutting tool chuck. German male g (SCHUNK) expansion of the company's static pressure and stress locking style collet-type tool is very famous among the two.
Static Expansion Tool chuck
Xiong Ke launched in 1983, named "TENDO" standard series Static Expansion (commonly known as hydraulic) tool chuck (Figure 1). Chuck clamping part of the cavity with a thin oil, pressurized by tightening bolts, oil cavity high pressure oil to the oil evenly to the inner surface extrusion axis, which play the role of solid compact tool . Oil chamber geometry, wall thickness and internal oil pressure have been accurately calculated, so it can ensure the clamping force clamping repeated in the required range.
This tool very convenient tool chuck cylinder handling, only a hex wrench to complete. It also set in a high precision and strong clamping, are suitable for roughing and finishing. Such a crude tool like chuck type, slender and so many types, and the machine spindle interface also SK, BT, HSK and other types. Different types of direct clamping of the tool chuck is not the same diameter, the maximum for the Ø32mm, but can be set with reducing chuck can be clamped to a multi-diameter tool.
Static Expansion chuck clamping rotary cutter high precision, the overhang 3D radial Department no more than 3 m, corresponding guide out three advantages: First, help to improve precision; 2 is guaranteed to be multi-blade knives in circle distribution of the cutting edge to cut into the depth of cut equal parts, which can reduce tool wear, and avoid excessive cutting force; Thirdly, it is beneficial to reduce the eccentric quality to ensure that high speed dynamic balance of the cutter. In addition, the tool chuck of the oil cavity and the high pressure oil to increase the structural damping can suppress vibration cutting process, which can improve the surface roughness be processed.
Overseas examples show that some applications, the use of such tools can not only improve the processing quality chuck, and can get better economic results. For example, a car parts factory in Germany, the original use of conventional deep-hole drill chuck to the annual output 13,500 pieces of cast aluminum parts (AlSi10MgCu) for deep hole drilling, the bit can drill 20 holes to 25 holes will be damaged, to guarantee that no bit of damage to produce waste, real life only 15 drill holes ~ 18 holes. When to use Static Expansion tool chuck, the same process conditions using the same drill bit to drill holes 40 to 43 will be damaged, then the recommended service life of drill hole 35 ~ 37 holes. Although the static pressure-expansion than conventional tool chuck chuck unit high, but in the instance of the use of it would lead to an increase of about twice the bit life, its annual cost savings is the use of such tools tool chuck pay for the cost of 45 times the economic benefit is obvious.
Xiong Ke company was launched called "TRIBOS" stress locking type tool chuck, it does not have a special clamping device, is the use of force to deformation of the chuck clamping their knives. Shown in Figure 2, in the free state of this chuck is similar to the shape of axisymmetric Mitsubishi special geometry of the diameter of its inscribed circle diameter is less than to clamping of the hilt, with a special pre-loaded knife Hydraulic AB device so that clamping force into round holes and slightly larger than the shank diameter, then can easily insert (or remove) tool, and then relieved by the external force increases, the hole re-contraction special geometric shape of the axial symmetry firmly clamping shank. This tool chuck compact, symmetrical, easy handling, high accuracy rotary clamping ( 3 m), has been widely used in mold, automotive, aerospace and other manufacturing. I am an expert from China Hardware Suppliers, usually analyzes all kind of industries situation, such as residential phone number search , remote control cars fast.
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