Location of the work on numerical control machine tool and outfit are placed

  • Time:
  • Click:108
  • source:KOMANG CNC Machining
Precision is machined to ensure in machining process, when the spare parts is machined on numerical control machine tool, must make workpiece holds a correct position on the machine tool first, locate namely, next its clamp. The process of this kind of fixed position and clamp calls the outfit clip of workpiece. The tooling that is used at holding clip work is machine tool clamping apparatus. Workpiece of manage of fixed position mansion was in the fundamental that 1 workpiece locates to ask for nothing at 6 o'clock have 6 freedom to spend, namely edge X, Y, z3 the rotational freedom that the mobile freedom of direction of rectangular coordinates axis is spent and confuses these 3 reference axis is spent accordingly, want to determine the position of workpiece completely, must eliminate these 6 freedom to spend, nod with 6 bearing normally (locate namely component) 6 freedom that will restrict a key are spent, among them a freedom with corresponding limitation of each bearing dot is spent, going up like Y plane, the king that the 3 bearing dot that is absent to go up point-blank together restricted workpiece, spend freely at 3, this plane says to give priority to datum plane; Two bearing that decorate along length direction on plane nod those who restricted workpiece to take two freedom to spend, this plane calls oriented plane; Workpiece is in Xoz on the face, was nodded to restrict by a bearing, a freedom is spent, plane is used till this plane says. 6 freedom of workpiece spend the place on put together to narrate, the seat that decides exclusively is won in if want,making workpiece is provided in center. With respect to need reasonable on clamping apparatus setting is equivalent to locating 6 bearing of component are nodded. Make the fixed position of workpiece standard as clingy as fixed position component contact, 6 all freedom that can eliminate work are spent. This is the principle of 6 Ju fixed position of workpiece. Of workpiece located at 6 o'clock 2 the application of fixed position principle located the principle fixed position to any appearance workpiece is applicable at 6 o'clock at 6 o'clock, if violate this principle, workpiece provides medium position to cannot decide completely in center. However. When with workpiece fixed position principle had fixed position at 6 o'clock, need fibrous root asks to be applied neatly according to specific treatment. Workpiece figure is different face of T fixed position is different, the distributinging case that fixed position orders meets each not identical, the tenet is to use the simplest location method, make workpiece wins correct seat quickly in clamping apparatus. The affirmatory Nextpage ① that workpiece should be restricted to be spent freely locates completely. 6 freedom of workpiece are spent be restricted by the place of fixed position component in clamping apparatus entirely, and completely definite only place is had in clamping apparatus, call complete fixed position. ② locates not completely. Machine different treatment requirement of the surface according to workpiece. The number that fixed position bearing orders is OK little at 6. Some freedom are spent influential to machining a requirement, some freedom spend pair of treatment to ask not to have an influence, want to ask with treatment the bearing that concern is nodded certainly only, with respect to the requirement that can obtain fixed position with less fixed position element, condition of this kind of position calls not complete fixed position. Not complete fixed position permits, below illustrate. Fixed position getting cut the value that on numerical control machine tool work location and outfit place at 5 o'clock the alveolus that add man, aperture of workpiece less than and an end panel locate on the arbor in clamping apparatus and plane, limitative workpiece is spent 5 times freely, be equivalent to 5 bearing choosing location. Workpiece circles the roll of arbor; Do not affect the treatment demand of pair of alveolus TD. Fixed position milling machined the B that open slot at 4 o'clock, workpiece in order to grow outside the circle is in the double V of clamping apparatus locates on form piece, restrict 4 freedom of workpiece to spend, be equivalent to 4 bearing choosing location. The F of workpiece, I spends the treatment that does not affect pair of B that open slot twice to ask freely. ③ owes fixed position. The freedom that according to treatment the requirement should limit is spent cast confined fixed position calls a fixed position. Owing fixed position is unallowed + pour locates to owe guarantee against treatment requirement. Be like a chamfer on milling spare parts, should restrict 3 freedom to spend ask in order to make sure the parallelism of bottom land face and A face and dimension are machined twice; Should restrict two freedom to spend machine a requirement in order to assure two to the parallelism of groovy flank and B face reachs O Lmm of dimension 30mm ± ; Freedom is spent do not affect the treatment that open slot, need not restrict. If do not have limitation to cannot assure; If jade-like stone, or trailing plants does not have limitation, the parallelism of bottom land and A face is unwarrantable. Owe ④ of fixed position give typical examples to cross fixed position. A of workpiece or a few fixed position that spend limitation be repetitioned by different fixed position element freely had called fixed position. Should cross fixed position to cause work or locate component is out of shape, when Bian noise adds fourth precision. Should forbidden use. But should cross fixed position not to affect treatment precision, advantageous to raising treatment precision instead when, also can use, want particular case concrete analysis. A few common kinds cross fixed position give typical examples the task of the concern fixed position of 3 fixed position and clamp and clamp is to differ, both cannot replace each other. If think workpiece by clamp hind, its position cannot be moved, so freedom is spent already restricted, this kind of understanding is the relation of wrong fixed position and clamp, labour is made the same score in bearing face 1 with two long cylinder is sold 2 on fixed position, it is OK that workpiece is put in solid line and dotted line position by clamp, but workpiece cannot decide in the position of X direction, the Kong Jiwei place that gets is not definite also (occurrence dimension A and A) . In X direction only the setting is blocked when selling, ability makes sure the hole that drills wins firm seat in X direction. On the other hand, if think workpiece is in,block the sold possibility that turns over direction to still have shift, the position is not accordingly firm, this kind of understanding also is wrong. When fixed position, must make the fixed position of workpiece fiducial and clingy go up in the fixed position component of clamping apparatus, otherwise its are asymmetry fixed position, and clamp is to make workpiece does not leave fixed position component. CNC Milling CNC Machining