CN101474749A - Composite slider of accurate feeding system with hot displacement constraint joint part - Google Patents

Abstract

The present invention discloses a complex slide carriage of a precise feeding system which is provided with a thermal displacement combination part. The complex slide carriage comprises a supporting slide carriage made of granite and a working slide carriage made of cast iron. A thermal displacement combination part is installed between the supporting slide carriage and the working slide carriage for connection. The thermal displacement combination part is used for eliminating the different thermal deformation which is between the supporting slide carriage and the working slide carriage and is caused by the difference of thermal characteristic of material, and can restrain six freedoms of working slide carriage relatively to the supporting slide carriage. A translational freedom which is parallel with the moving direction Z of slide platform is executed with a tangential restriction. The other five freedoms are not only executed with tangential restriction but also executed with normal restriction. The complex slide carriage of the invention adopts the thermal displacement combination part for connection and can settle the interference of thermal deformation between materials with different thermal expansion coefficients, and reduce the effect of thermal deformation to the precision of precise and ultra-precise digital control machine tool.

Description

Composite slider with accurate feeding system of hot displacement constraint joint part

Technical field

The invention belongs to the precision machine tool technical field, relate to a kind of slide of high-precision numerical control machine feed system, be specifically related to a kind of composite slider with accurate feeding system of hot displacement constraint joint part.

Background technology

At present, more and more higher to the requirement on machining accuracy of part, the machine tool difficult processing to be meeting the demands, must adopt multi-shaft interlocked, at a high speed, high-precision high-performance Digit Control Machine Tool machining high-precision part.Along with the improving constantly of machine finish, the ultraprecise machining accuracy has entered nanoscale in recent years.Precision, ultraprecise Digit Control Machine Tools such as large-scale precision five-axis linkage machine tools, coordinate level precision finishing machine become the important development direction of Digit Control Machine Tool.

The machine tool feed system is one of key factor that influences lathe complete machine performance.Feed system accurate, the ultraprecise Digit Control Machine Tool adopts the linear electric motors (rectilinear motion) of zero transmission and torque motor (gyration) to drive, but the heating of linear electric motors and torque motor and installation to be connected be the problem that needs special concern.

Environment temperature, heat in metal cutting, the thermal deformation of the machine tool structure spare that the motion heating causes is to precision, the influence of ultraprecise machining accuracy of NC machine tool is very big, for reducing this kind influence, accurate, some structural members of ultraprecise Digit Control Machine Tool adopt thermal coefficient of expansion little, being out of shape little grouan material makes, structural member as three coordinate measuring machine can all adopt grouan material, but grouan material is difficult for the structural member of manufacturing complex shapes, so have the precision of multiaxis (as the 5) interlock of dynamic change chip-load, the ultraprecise Digit Control Machine Tool is difficult to all adopt the granite structure, just general supporting member wherein adopts grouan material to make, and moves, execution units such as rotary table then adopt metal material to make.But the thermal coefficient of expansion of grouan material and metal material differs 2～3 times, thereby solution granite structural member is connected the joint portion with hardware thermal characteristics problem is a key technology accurate, the ultraprecise Digit Control Machine Tool.

The accurate feeding system that adopts linear electric motors to drive comprises slide unit, slide, guide assembly and linear electric motors, elementary and the slide of the orbit determination of guide assembly and linear electric motors is fixedlyed connected, the moving rail of guide assembly and the inferior utmost point of linear electric motors are fixedlyed connected with slide unit, if slide unit and guide assembly adopt metal structure, and slide directly adopts the grouan material structure, because granite and metal material thermal coefficient of expansion differ greatly, the thermal deformation difference of the two will have a strong impact on the precision of precision, ultraprecise NC machine tool feed system.

Summary of the invention

The purpose of this invention is to provide a kind of composite slider with accurate feeding system of hot displacement constraint joint part, the accurate feeding system that is used for precision, ultraprecise Digit Control Machine Tool, solve existing feed system and connected the thermal deformation difference that the joint portion causes because of the material thermal characteristics difference of structural member, and then had influence on the problem of feed system precision.

The technical solution adopted in the present invention is, a kind of composite slider with accurate feeding system of hot displacement constraint joint part, comprise supporting slide and castiron work slide that granite is made, be provided with hot displacement constraint joint part between supporting slide and the work slide.

Feature of the present invention also is,

Hot displacement constraint joint part is made up of a plurality of faying faces that be arranged in parallel respectively between supporting slide and the work slide bound fraction, and each faying face is along the length direction setting of supporting slide, and each faying face is made of a plurality of disjunct sub-faying faces mutually.

Faying face comprises at least two faying face A that be arranged in parallel, at least two faying face B that be arranged in parallel, at least two faying face C that be arranged in parallel, at least two faying face D that be arranged in parallel and at least two faying face E that be arranged in parallel, faying face C is between supporting slide working edge end face and work slide inside top face, faying face B is between supporting side of slide working edge and work slide respective side walls inboard, faying face D is relative with faying face B, between another side and work slide respective side walls inboard of supporting slide working edge, faying face E and faying face A are below supporting slide working edge and between the work slide bottom inside.

The pass of hot displacement constraint joint part external applied load and hot displacement constraint is:

$F+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{}^{c}J_i{F}_{\mathrm{Ri}}=0$

$\left\{\begin{array}{c}{F}_{\mathrm{Ri}1}=-{\∫}_{\mathrm{Si}}{p}_{1i}d{s}_i\\ F_{\mathrm{Ri}2}=-{\∫}_{\mathrm{Si}}{p}_{2i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}3}=-{\∫}_{\mathrm{Si}}{p}_{3i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}4}=-{\∫}_{\mathrm{Si}}{p}_{3i}{X}_{2i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{2i}{X}_{3i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}5}=-{\∫}_{\mathrm{Si}}{p}_{1i}{X}_{3i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{3i}{X}_{1i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}6}=-{\∫}_{\mathrm{Si}}{p}_{2i}{X}_{1i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{1i}{X}_{2i}{\mathrm{ds}}_i\end{array}\right.$

In the formula, F is an external applied load; F _RiBe i sub-faying face restraining force and moment under sub-faying face coordinate system i, wherein, F _Ri1, F _Ri2, F _Ri3Be restraining force, F _Ri4, F _Ri5, F _Ri6Be restraining force and moment, i=1～n,, n is sub-faying face quantity; ^cJ _iBe the Jacobian matrix between joint portion coordinate system c and sub-faying face coordinate system i; p _2iBe that i the normal direction contact-making surface on the sub-faying face pressed, p _1i, p _3iIt is the tangential contact-making surface pressure on i the sub-faying face; X _1i, X _2i, X _3iBe i the position coordinates on the sub-faying face, S _iBe i the area on the sub-faying face.

Composite slider of the present invention adopts hot displacement constraint joint part to be connected between cast iron work slide and granite supporting slide, can solve between different thermal expansion coefficient material thermal deformation and interfere, and reduces the influence of thermal deformation to precision, ultraprecise Digit Control Machine Tool.

Description of drawings

Fig. 1 is the structural representation of composite slider of the present invention;

Fig. 2 is the structural representation of thermal walking joint portion in the composite slider of the present invention;

Fig. 3 is the A-A cutaway view of Fig. 2;

Fig. 4 is the syndeton schematic diagram that composite slider of the present invention is used for the machine tool feed system.

Among the figure, 1. support slide, 2. hot displacement constraint joint part, 3. work slide, 4. linear electric motors, 5. slide unit, 6. guideway assembly, 7. foundation support spare.

Wherein, 2-1. faying face A, 2-2. faying face B, 2-3. faying face C, 2-4. faying face D, 2-5. faying face E.

The specific embodiment

The present invention is described in detail below in conjunction with the drawings and specific embodiments.

The structure of composite slider of the present invention as shown in Figure 1, comprises supporting slide 1, castiron work slide 3 and hot displacement constraint joint part 2 that granite is made.The cross section of supporting slide 1 is " H " shape, the cross section of work slide 3 is the Q-RING of monolateral opening, the shape of this Q-RING endoporus cross section adapts with the shape of cross section of supporting slide 1 working edge, supporting slide 1 working edge is positioned at the square opening of work slide 3, work slide 3 contacts by hot displacement constraint joint part 2 with supporting slide 1, is provided with hot displacement constraint joint part 2 between the faying face of work slide 3 and supporting slide 1 working edge.Do not have macroscopic motion between work slide 3 and the supporting slide 1, but small relatively hot displacement can be arranged.

The structure of hot displacement constraint joint part 2 in the composite slider of the present invention is shown in Fig. 2 a, 2b.Horizontal Tile is provided with a plurality of faying face C2-3 between supporting slide 1 working edge end face and the work slide 2 square opening end faces, and each faying face C2-3 is along the length direction setting of supporting slide 1, and each faying face C2-3 is made up of a plurality of disjunct sub-faying faces mutually.Support a side of slide 1 working edge and work and be provided with at least two faying face B2-2 that are parallel to each other between the slide 3 square opening respective side walls, all along the length direction setting of supporting slide 1, each faying face B2-2 is made up of a plurality of disjunct sub-faying faces mutually each faying face B2-2.Be provided with at least two faying face D2-4 that are parallel to each other between another side of supporting slide 1 working edge and the work slide 3 square opening respective side walls, all along the length direction setting of supporting slide 1, each faying face D2-4 is made up of a plurality of disjunct sub-faying faces mutually each faying face D2-4.Be provided with at least two faying face A2-1 that are parallel to each other and faying face E2-5 between supporting slide 1 working edge bottom surface and the work slide 3 square openings bottom, all along the length direction setting of supporting slide 1, faying face A2-1 and faying face E2-5 constitute by a plurality of sub-faying faces for faying face A2-1 and faying face E2-5.The major parameter of the sub-faying face of hot displacement constraint joint part is material, predeformation and faying face size, and sub-faying face material mainly influences the frictional behavior and the rigidity of faying face, and predeformation and faying face size mainly influence the rigidity of faying face.Joint portion external applied load and hot displacement constraint relational expression are as follows:

$F+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{}^{c}J_i{F}_{\mathrm{Ri}}=0$

$\left\{\begin{array}{c}{F}_{\mathrm{Ri}1}=-{\∫}_{\mathrm{Si}}{p}_{1i}d{s}_i\\ F_{\mathrm{Ri}2}=-{\∫}_{\mathrm{Si}}{p}_{2i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}3}=-{\∫}_{\mathrm{Si}}{p}_{3i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}4}=-{\∫}_{\mathrm{Si}}{p}_{3i}{X}_{2i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{2i}{X}_{3i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}5}=-{\∫}_{\mathrm{Si}}{p}_{1i}{X}_{3i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{3i}{X}_{1i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}6}=-{\∫}_{\mathrm{Si}}{p}_{2i}{X}_{1i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{1i}{X}_{2i}{\mathrm{ds}}_i\end{array}\right.$

In the formula, F is an external applied load; F _RiBe i sub-faying face restraining force and moment (F under sub-faying face coordinate system i _Ri1, F _Ri2, F _Ri3Be restraining force F _Ri4, F _Ri5, F _Ri6Be restraining force and moment), i=1～n,, n is sub-faying face quantity; ^cJ _iBe the Jacobian matrix between joint portion coordinate system c and sub-faying face coordinate system i; p _2iBe that i the normal direction contact-making surface on the sub-faying face pressed, p _1i, p _3iIt is the tangential contact-making surface pressure on i the sub-faying face; X _1i, X _2i, X _3iBe i the position coordinates on the sub-faying face, S _iBe i the area on the sub-faying face.

Normal direction on the faying face presses distribution relevant with faying face material, distortion (containing predeformation) and faying face size with tangential contact-making surface, the faying face material adopts metal (as copper etc.) and nonmetal (as the resin) of friction coefficient, simultaneously by predeformation and the design of faying face physical dimension coupling, with hot displacement constraint and the rigidity requirement that satisfies composite slider.

Composite slider of the present invention is used for the syndeton of feed system, as shown in Figure 3.Supporting slide 1 be fixedly installed in foundation support spare 7 above, the upper surface of work slide 3 is connected with guideway assembly 6, is connected with slide unit 5 above the guideway assembly 6, is installed with linear electric motors 4 between slide unit 5 and the slide 3 of working.

Hot displacement constraint joint part 2 has 6 free degree binding functions, sub-faying face fixed constraint with the part is the relative displacement benchmark, translational degree of freedom along slide unit direction of motion Z coordinate direction, have only faying face tangentially to retrain, be that faying face A2-1, faying face B2-2, faying face C2-3, faying face D2-4 and faying face E2-5 are parallel to the Z coordinate, be faying face and tangentially retrain; Perpendicular to the X of the slide unit direction of motion, the translational degree of freedom of Y coordinate direction, existing faying face B2-2 and faying face D2-4 be to the tangential constraint of X coordinate direction translational degree of freedom and faying face A2-1, faying face C2-3 and the faying face E2-5 tangential constraint to Y coordinate direction translational degree of freedom, faying face A2-1, faying face C2-3 and faying face E2-5 arranged to the normal direction constraint of X coordinate direction translational degree of freedom and faying face B2-2 and the faying face D2-4 normal direction constraint to Y coordinate direction translational degree of freedom again.For around X, Y, Z rotational freedom, faying face A2-1, faying face B2-2, faying face C2-3, faying face D2-4 and faying face E2-5 all play normal direction constraint and tangential effect of contraction simultaneously.

The faying face A2-1 that forms by sub-faying face, faying face B2-2, faying face C2-3,2 pairs of supportings of the common hot displacement constraint joint part that constitutes of faying face D2-4 and faying face E2-5 slide 1 and 6 the relative frees degree between the slide 3 of working are carried out constraint in various degree, translational degree of freedom to the Z coordinate direction parallel with the slide unit direction of motion carries out weak constraint (the relatively hot displacement of its Z direction can compensate control by the motion of Z axle), to other 5 frees degree (along X, Y coordinate direction translational degree of freedom, around X, around Y, around Z coordinate direction rotational freedom) carry out strong constraint, have enough rigidity to guarantee composite slider.

Claims (4)

1. composite slider with accurate feeding system of hot displacement constraint joint part, comprise supporting slide (1) and castiron work slide (3) that granite is made, it is characterized in that, be provided with hot displacement constraint joint part (2) between described supporting slide (1) and the work slide (3).

2. composite slider according to claim 1, it is characterized in that, described hot displacement constraint joint part (2) is made up of a plurality of faying faces that be arranged in parallel respectively between supporting slide (1) and work slide (3) bound fraction, each faying face is along the length direction setting of supporting slide (1), and each faying face is made of a plurality of disjunct sub-faying faces mutually.

3. composite slider according to claim 2, it is characterized in that, described faying face comprises at least two faying face A (2-1) that be arranged in parallel, at least two faying face B (2-2) that be arranged in parallel, at least two faying face C (2-3) that be arranged in parallel, at least two faying face D (2-4) that be arranged in parallel and at least two faying face E (2-5) that be arranged in parallel, described faying face C (2-3) is positioned between supporting slide (1) working edge end face and work slide (2) the inside top face, described faying face B (2-2) is positioned between supporting side of slide (1) working edge and work slide (3) the respective side walls inboard, described faying face D (2-4) is relative with faying face B (2-2), be positioned between another side and work slide (3) respective side walls inboard of supporting slide (1) working edge, described faying face E (2-5) and faying face A (2-1) are positioned at below supporting slide (1) working edge and work between slide (3) bottom inside.

4. composite slider according to claim 1 is characterized in that, the pass of described hot displacement constraint joint part (2) external applied load and hot displacement constraint is:

$F+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{}^{c}J_i{F}_{\mathrm{Ri}}=0$

$\left\{\begin{array}{c}{F}_{\mathrm{Ri}1}=-{\∫}_{\mathrm{Si}}{p}_{1i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}2}=-{\∫}_{\mathrm{Si}}{p}_{2i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}3}=-{\∫}_{\mathrm{Si}}{p}_{3i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}4}=-{\∫}_{\mathrm{Si}}{p}_{3i}{X}_{2i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{2i}{X}_{3i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}5}=-{\∫}_{\mathrm{Si}}{p}_{1i}{X}_{3i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{3i}{X}_{1i}{\mathrm{ds}}_i\\ F_{\mathrm{Ri}6}=-{\∫}_{\mathrm{Si}}{p}_{2i}{X}_{1i}{\mathrm{ds}}_i+{\∫}_{\mathrm{Si}}{p}_{1i}{X}_{2i}{\mathrm{ds}}_i\end{array}\right.$

In the formula, F is an external applied load; F _RiBe i sub-faying face restraining force and moment under sub-faying face coordinate system i, wherein, F _Ri1, F _Ri2, F _Ri3Be restraining force, F _Ri4, F _Ri5, F _Ri6Be restraining force and moment, i=1～n,, n is sub-faying face quantity; ^cJ _iBe the Jacobian matrix between joint portion coordinate system c and sub-faying face coordinate system i; p _2iBe that i the normal direction contact-making surface on the sub-faying face pressed, p _1i, p _3iIt is the tangential contact-making surface pressure on i the sub-faying face; X _1i, X _2i, X _3iBe i the position coordinates on the sub-faying face, S _iBe i the area on the sub-faying face.

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