Milling machine clamping apparatus is right dimension of knife piece position is decided really

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Clamping apparatus ends in the installation on the machine tool, before undertaking machining, still need to undertake pair of knives of clamping apparatus, make cutting tool locates relative to clamping apparatus component is in proper place. Have 3 kinds normally to the method of the knife: Try cut a way to the knife, setting method is right knife, with appearance or right to knife device knife. No matter which use to plant pair of knife methods, involve fiducial to the knife mix pair of knife dimension. It is normally with with labour year locate the fixed position face on the fixed position component of fiducial coincide serves as fiducial to the knife, in order to reduce the error that fiducial commutation brings. Pair of knife dimension of milling machine clamping apparatus be from fiducial to the knife to the positional dimension between surface of cutting tool cutting, mix dimension of pair of knife piece position are poor ply of feet of an a place of strategic importance. The treatment dimension on the work that affects the element of dimension of pair of knife piece position to basically pair of knives need to assure, fixed position is standard the ply S that the smallest displacement that machining dimension direction measures Imin and foot of a place of strategic importance, the article with familiar fixed position pattern -- opening fixed position, columnar side fixed position is exemple, undertake milling machine clamping apparatus is opposite the analytic computation of dimension of knife piece position. Exemple of 1 computation example 1: If pursue 1 8 ± are machined on workpiece 0.

The keyway of 06mm, assure symmetry 0.

2mm and positional dimension 30-00.

2mm, the graph is shown 2 times pursue to the knife for fixed position, the aperture inside workpiece is  20H70+0.

021mm, arbor is  20h6-0.

020-0.

007mm, to secure unilateral contact, choose right angle to be opposite knife piece, 1mm of = of S of ply of feet of a place of strategic importance, the computation that determines size of pair of knife piece position is as follows: Graph 1 graph the positional measure that 2   show pair of knife piece with H/2 of H ± δ , the size that the dimension on its correspondence workpiece assures directly to the knife namely indicates with H/2 of H ± δ , here H is the average of the dimension that assures directly to the knife. Inside the limits that the key that seeks a H/2 of H ± δ according to H/2 of H ± δ is the tolerancepublic errand area that should check cutting tool to H/2 of δ of dimension H ± , take δ H = normally (5 ~ of 1 / 1 / 3) δ H. Line out is right if dimension of knife piece position pursues 2 in H1/2 of H1 ± δ and H2/2 of H2 ± δ , the dimension that goes up according to workpiece gets: H2/2=(30-0 of H2 ± δ .

1) ± 0.

1=29.

9 ± 0.

H1/2 of δ of ± of H1 of 1mm     needs to be gotten through solving dimension catenary, if pursue,3 are shown. H1/2=4 ± of H1 ± δ 0.

07mm   takes 4=0 of / of H1 of δ of δ H1 = .

4 = of 14 ÷ 0.

4=0 of / of H2 of δ of = of 035mm δ H2.

4 = of 2 ÷ 0.

H1/2=4+1 ± of δ of ± of H1 of 05mm   reason 0.

± of 035 / 2=5 0.

0175mm, (± of H2/2=(H2-S-i2min) of δ of ± of H2 of I1min=0)     0.

=29 of   of   of   of   of 05/2     .

9-1-0.

2 ± of 007 / 0.

=28 of   of   of   of   of 025    .

897 ± 0.

025mm   still can use a figure additionally 2/2 of ′ of H of 2 ± δ comes to 2 medium H ′ state pair of knife piece are perpendicular directional position, regard fixed position as standard treatment chamfer with A of the generatrix on the aperture inside workpiece right now, right the 2 ± of ′ of positional dimension H of knife piece surface 2/2 of δ H ′ from fixed position the bearing of fiducial A orders the generator on A(arbor) tag case. H ′ 2 by the graph 1 in S of ply of feet of subtractive a place of strategic importance calculates average of dimension of workpiece working procedure. Namely: δ H ′ 2 need to get δ H ′ through solving dimension catenary 2 hind get, (See graph 4) . 2=0 of δ H ′ .

2-0.

021/2=0.

2 / of ′ of H of δ of 2= of ′ of 1995 H extraction δ 4=0.

4  of 1995 ÷ 0.

2 ± of ′ of 0499 reason H 2 ′ of δ H ′ 2/2=18.

895 ± 0.

02495mm exemple 2: Graph 5 for workpiece process chart, graph 6 pursue to the knife for fixed position, right the positional dimension of surface of knife piece job by V the standard heart great center of form piece is noted case, right now Imin=0, reason is right the positional dimension H of knife piece end face presses average of working procedure dimension (H-TH/2) and decision of S of ply of feet of a place of strategic importance: Graph 3 graphs because of,H=H-TH/2-S of 4     takes 4   of / of 4=TH of / of H of δ H= δ 8 graphs of / of TH of ± of H/2=H-TH/2-S of δ of this H ± 62 computation of 5 graphs are right the general formula of dimension of knife piece position by above the analysis of two example is calculated, can induce a computation is right the general formula of H/2 of δ of ± of H of dimension of knife piece position is: In type of H/2 of δ of ± of Imin of ± of S of ± of H/2=H of H ± δ : H, fixed position is standard the average that is apart from to what machine the surface; S, ply of feet of a place of strategic importance; Imin, fixed position is standard the volume of the smallest displacement that processing measure respect. When Imin makes machine dimension to increase, take before Imin " - " date; When Imin makes machine dimension to narrow, take before Imin " + " date. δ H, right the public errand of H of dimension of knife piece position, take δ H = normally (5 ~ of 1 / 1 / 3) δ H, among them the public errand that δ H is dimension H. Clamping apparatus of 3 affirmatory milling machine is right the measure   of dimension of knife piece position (1) decides pair of knives are fiducial, line out is right the Hv/2 of δ of ± of positional dimension H of knife piece. (The H/2 of δ of dimension H ± that 2) finds out the workpiece that assures as correspondingly as H/2 of δ of dimension H ± directly to the knife to go up, this dimension is below some circumstances foregone, the need below some circumstances solves dimension catenary to get. (3) reachs δ H = by H/2 of δ of ± of Imin of ± of S of ± of H/2=H of H ± δ (5 ~ of 1 / 1 / 3) δ H begs a H/2 of H ± δ according to H/2 of H ± δ , inside the limits that assures to be opposite cutting tool to public errand of H/2 of δ of dimension H ± to take thereby. 4 precision desired result uses a level feet of a place of strategic importance and right knife piece is right knife, must make sure W of Δ of position error of DA of pair of knife error Δ , clamping apparatus satisfies δ of ≤ of W of Δ of DA+ of Δ of   of inequality     / 3 or 3 ability of 2 δ / assure ≤ of W of Δ of DA+ of Δ AZ+ Δ finally treatment precision. Among them: Δ AZ -- workpiece mounting error (include J of Δ of error of DW of Δ of fixed position error, clamp; δ -- the public errand of workpiece treatment dimension. CNC Milling CNC Machining