JP2007030123A - Cross rail type machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct deflection of a cross rail so as not to make distinguished the tool trajectory of wave patterns generated by the deflection of a cross rail transferred to a workpiece surface processed by a machine tool. <P>SOLUTION: This cross rail type machine tool 100 is provided with a saddle 5 mounted to a tool head 7 reciprocatably on a cross rail 4. A recess is provided in a longitudinal direction at an approximate center of a guide rail 10b of a cross rail 4. A plurality of spaces are provided to the recesses 12c of the guide rail at equal intervals in a longitudinal direction, and a deflection correction mechanism 12, in which a pair of a fixing inclination block 12a and a moving inclination block 12b are fitted and inserted upward and downward, is provided at respective spaces. Furthermore, a tool head inclination adjusting mechanism 13 is provided near a saddle travelling direction of the guide rail 10b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a machine tool in which a tool (grinding stone, cutter, drill, etc.) is attached to a sliding body so as to face the work position of the workpiece, along the longitudinal direction of the cross rail on which the sliding body travels. The present invention relates to a cross-rail type machine tool provided with a deflection adjusting mechanism.

  A sliding body (saddle) with a cross rail stretched horizontally on a pair of standing columns and a tool (grinding stone, cutter, drill, etc.) attached to face the work position on the bed There are known cross-rail fixed grinding devices and lathes that reciprocate on a cross rail (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4).

  For example, in Patent Document 2, a bed, a cross rail provided above the bed, a saddle that is guided by the cross rail and moves back and forth, a sliding table that is guided by the saddle and moves up and down, A table on which an object is placed and moved left and right on the bed; a tool head attached to the sliding table and provided with a vertical drive shaft and a drive motor; and a swivel indexing mechanism attached to the lower end of the tool head; An angle head that is connected to the tool head via the swivel indexing mechanism, meshes with the drive shaft, and has a horizontal main shaft to which a tool is attached at the tip, and a cutting mechanism that moves the main shaft in the axial direction. A surface grinding apparatus is disclosed.

  In such a cross-rail type machine tool, the cross-rail that movably guides the saddle that supports the tool may be bent or distorted due to the weight of the tool or a change in the installation environment of the machine tool. This bending or distortion is known to leave a wavy grinding wheel trace resembling the bending of a cross rail on the surface of a workpiece subjected to surface grinding, for example.

  In order to improve the work accuracy of the workpiece, means for correcting the deformation of the cross rail and the guide rail has been proposed. For example, Patent Document 3 discloses a beam-shaped frame member disposed so as to face a work position of a workpiece, and is substantially parallel to the beam-shaped frame member and supports a movable body (saddle) in a movable manner. Proposed machine tool comprising a guide rail to be operated, and a telescopic member having a plurality of telescopic members disposed at equal intervals along the longitudinal direction of the guide rail and the beam-shaped frame between the beam-shaped frame member and the guide rail To do. The expansion / contraction member expands / contracts by deformation of the electrostrictive element, and expands / contracts to adjust the curvature of the guide rail or the distance between the guide rail and the beam-like frame member. (For example, refer to Patent Document 3).

In addition, the above-mentioned Patent Document 4 is a vertical lathe having an arm (guide rail) that moves up and down along a column erected on a bed and supports a saddle provided with a tool so as to reciprocate in a horizontal direction. The tension bar resists the tensile elongation generated by the arm's own weight and the weight of the saddle, and the compression bar resists compression / shrinkage by the compression bar, thereby suppressing the deflection of the arm and ensuring straightness. Since these bars are provided near the neutral surface in the thickness direction of the arm, the arm is prevented from being deformed in the front-rear direction.
JP-A-11-320301 JP 2001-138890 A Japanese Patent Laid-Open No. 2001-138190 JP-A-9-117801

  The guide rail deflection correction means described in Patent Document 3 is performed by a plurality of elastic members arranged at equal intervals along the longitudinal direction of the beam-like frame, so that sufficient correction is made for deflection in the tool axis direction. However, there is no countermeasure against tilt distortion of the guide rail with respect to the tool head, and the length of the expansion / contraction member is large, which is not sufficient to eliminate waviness deflection.

  Since the arm (guide rail) deflection correcting means described in Patent Document 4 is performed by closing and opening a pair of long tension bars and double nuts attached to both ends of the compression bar, rough correction is performed. However, the wave peak height (amplitude) wavelength of the wave-like deflection of the arm is larger than that of Patent Document 3. The present invention provides a cross-rail type machine tool provided with a cross-rail deflection adjusting mechanism capable of correcting the deformation (deflection) of the guide rail to a smaller extent.

  According to the first aspect of the present invention, a cross rail is stretched horizontally on a pair of standing columns, and a saddle to which a tool is attached so as to face the work position on the bed is placed on the cross rail. A cross-rail type machine tool provided so as to be capable of reciprocating, wherein the cross-rail is provided with a pair of guide rails on which the saddle travels, spaced apart in the horizontal direction on the side of the cross-rail frame. The guide rail provided below is provided with a concave portion in the longitudinal direction at a substantially central portion of the guide rail, and a plurality of voids are further provided at equal intervals in the longitudinal direction in the concave portion of the guide rail. A pair of inclined blocks are inserted vertically into each of them, and one of the inclined blocks is fixed to the cross rail frame, and the other inclined block can be slid on the inclined surface of the fixed inclined block with an adjusting bolt. Le - Rufure - and characterized in that it constitutes a mounting was deflection correction mechanism arm, Kurosure - there is provided a Le machine tool.

  According to a second aspect of the present invention, at least one pair of voids is provided in a cross rail frame in the vicinity where the saddle of the lower guide rail of the cross rail travels, and a plurality of tool head inclination adjusting mechanisms are provided in these voids. The cross-rail type machine tool according to claim 1, wherein the cross-rail type machine tool is provided.

  According to a third aspect of the present invention, the tool head inclination adjusting mechanism pushes the roller with a wedge block, and the wedge block advances and retreats in a direction perpendicular to the advancing and retreating direction of the adjusting bolt of the deflection correcting mechanism. The cross-rail type machine tool according to claim 2, wherein the cross-rail type machine tool is attached to the cross-rail frame.

  The machine tool according to claim 1 is provided with a plurality of sets of a deflection correction mechanism including a pair of a fixed inclination (wedge-shaped) block and a moving inclination (wedge) block in the longitudinal direction of the cross rail, and movement at the time of the correction of the deflection. Since the movement width of the inclined block is extremely small, the wave height (amplitude) of the deflection can be corrected to be extremely small.

  The machine tool according to claim 2 and claim 3 is configured such that the inclination of the tool head attached to the saddle with respect to the guide rail is adjusted by a tool head inclination adjusting mechanism that adjusts the tilting of the tool head that occurs during tool replacement. By fine adjustment, a work workpiece with further excellent straightness can be obtained.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
1 is a perspective view of a cross-rail fixed grinding device, FIG. 2 is a side view of the cross rail viewed from the direction D in FIG. 1, and FIG. 3 is a cross-rail viewed from the direction A in FIGS. FIG. 4 is a front view of a cross-rail deflection correction mechanism and a tool head tilt adjustment mechanism enlarged from the B direction in FIG. 2, and FIG. 5 is a view in the direction of arrow C in FIG. It is a side view of the tool head inclination adjustment mechanism seen from.

  In the cross-rail fixed surface grinding apparatus 100 shown in FIG. 1, 1 is a bed, 2 is a table, and a work is placed on the guide rails 2a and 2a in the X-axis direction. Reference numeral 4 denotes a cross rail, which is stretched horizontally on the pair of columns 3 and 3. Reference numerals 10a and 10b denote guide rails which are provided on the side surfaces of the cross rail frame 4a so as to be separated from each other in the horizontal direction. 10e and 10f are covers which cover the side surfaces of the guide rails 10a and 10b. Reference numeral 5 denotes a saddle, which is provided with a slide base 6 on which a grindstone head (tool head) 7 is mounted so as to be movable up and down. The saddle 5 can reciprocate in the Z-axis direction on the guide rails 10a and 10b by receiving a driving force of a ball screw and a motor (not shown). 8 is a ball screw receiving space. The sliding table 6 can be moved up and down in the Y-axis direction by receiving the driving force of the motor 6 c along a guide rail 6 a provided on the saddle 5. The grinding wheel 7a attached to the grinding wheel shaft 7b receives the rotational driving force of the motor 7c and rotates around the grinding wheel shaft 7b. In FIG. 1, the arrow A side is the front, and the arrow D side is the side.

2 and 3 show the cross rail 4 and the saddle 5 with a part of the lower cover 10f removed. A pair of guide rails 10a and 10b are provided horizontally on the side surface of the cross rail frame 4a. A concave portion 10c is provided in the longitudinal direction at a substantially central portion of the guide rail 10b provided below the pair of guide rails, and a plurality of voids 10d are further provided at equal intervals in the longitudinal direction in the concave portion 10c of the guide rail. A pair of inclined blocks 12a and 12b are vertically inserted into each of these empty spaces 10d. One inclined block 12a is fixed to the cross rail frame 4a with fixing bolts 12c, and the other inclined block 12b can be slid on the inclined surface 12e of the fixed inclined block 12a. The deflection correction mechanism 12 is attached to the lens 4a. The inclination of the wedge-shaped inclined surface 12e of the inclined block is 1 to 5 degrees. Le extending in the horizontal direction in parallel with the top and bottom by the recess 10c - Le 10b _1, 10b ₂ under Le - slide in Le 10b ₂ front - le 9 is stretched.

  In the cross rail 4 having a length of 2965 mm and a height of 796 mm shown in FIG. 2, a pair of guide rails 10a and 10b having a length of 2965 mm and a height of 160 mm are provided on the side surface of the cross rail frame. -Nine deflection correction mechanisms 12 are provided at intervals of 320 mm in the recesses of the rod 10b. The height of the pair of inclined blocks 12a and 12b is 40 mm in total.

  The deflection correction mechanism 12 contributes to distortion correction of the cross rail 4 in the vertical (Y-axis) direction and the front (Z-axis) direction. The amount of movement of the moving inclination block 12b of the deflection correction mechanism 12 takes into account the wave height from the longitudinal center line of the wave, which is the movement locus of the grinding wheel transferred to the surface of the previously machined grinding work. The amount of movement of the position-inclined block 12b is calculated from an empirical rule. When the wave height is positive, the adjusting bolt 12d of the moving tilt block 12b is rotated counterclockwise to lower the moving tilt block 12b. When the wave height is negative, the adjustment bolt 12d of the moving inclination block 12b is rotated in the clockwise direction to raise the moving inclination block 12b. If such an operation is repeated while looking at the previously worked workpiece, the deflection of the cross rail is reduced and the straightness of the workpiece is improved.

  In the deflection correction mechanism 12 shown in FIGS. 2 and 4, the inclination of the wedge-shaped inclined surface 12e of the inclined block is 3 degrees, and the rotation of the adjusting bolt 12d by 1/4 (90 degrees) is 0 of the moving inclined block 12b. .0131 mm rise or fall.

  As shown in FIGS. 2 and 5, the tool head inclination adjusting mechanism 13 has at least one pair of voids 13k in the cross rail frame 4a in the vicinity of which the saddle 5 of the lower guide rail 10b of the cross rail travels. A plurality of tool head inclination adjusting mechanisms 13 are installed in these voids.

  The tool head inclination adjusting mechanism 13 may be of a type in which a disc spring is pushed by a biasing bolt, but like the tool head inclination adjusting mechanism shown in FIGS. 4 and 5, the roller 13a is pushed by a wedge block 13b. It is easy to install and handle the cross rail frame 4a so that the wedge block 13b is advanced and retracted by the rotation of the fine adjustment bolt 13c in a direction perpendicular to the advance and retreat direction of the adjustment bolt 12d of the deflection correction mechanism 12. Therefore, it is preferable.

In the tool head tilt adjusting mechanism 13 shown in FIGS. 4 and 5, 13a is b - la, 13a ₁ is b - inclined groove provided La, 13b are wedge block, 13b ₁ is inclined wedge block Ba -, 13c Is a fine adjustment bolt, and 13d is a roller pack for accommodating the roller 13a. Reference numeral 13e denotes a fastening bolt. The wedge block inclined bar 13b ₁ is inclined by 12 degrees, and the upper surface of the inclined groove 13a ₁ provided in the radial direction of the roller 13a is slid by the advance and retreat of the wedge block 13b by the rotation of the fine adjustment bolt 13c. -Increase or decrease the urging force on the roller 13a. The urging force applied to the roller 13a urges the X-axis direction of the cross rail frame 4a. After the fine tilt adjustment of the tool head 6 is performed, the fastening fixing bolt 13e is clamped.

  A roller presser plate 14 is fixed to the saddle frame 5a in the vicinity of the tool head inclination adjusting mechanism 13 by a countersunk screw 15 in parallel with the longitudinal direction of the fine adjustment bolt 13c. A seal plate 16 in the form of a bracket (") is fixed to the saddle frame rib 5b by a countersunk screw 17 at the rear, and the saddle plate 16 has a saddle sliding surface of the lower guide rail 10b at the lower portion thereof. The contacting slide seal 18 is fixed by a bolt 19. The installation of these plates 14 and 16 reduces the chance of dust entering the tool head inclination adjusting mechanism 13.

  In order to grind the workpiece using the cross-rail type surface grinding machine 100 of the present invention shown in FIG. 1, the workpiece is fixed on the table 2 using a jig such as an electromagnetic chuck if necessary. The movement of the table 2 in the left-right direction (X-axis direction), the rotation of the grinding wheel 7a attached to the grinding wheel head 7, the longitudinal movement of the grinding wheel head 7 (Z-axis direction), and the vertical movement of the grinding wheel head (Y (Axial direction) The grinding wheel is brought into contact with the work surface and cut by a relative combination of up and down movement.

  When the grinding wheel trajectory with a wave pattern caused by cross rail deflection is transferred to the surface of the ground workpiece, the guide rail 10b is made to make the amplitude and wavelength of the wave as small as possible. The adjustment bolt 12d of the provided deflection correction mechanism 12 is rotated, and the fine adjustment bolt 13c of the tool head inclination adjustment mechanism 13 is rotated and adjusted.

  As another aspect of the present invention, the deflection correcting mechanism 12 and the tool head inclination adjusting mechanism 13 may be provided in the upper guide rail 10a instead of being provided in the lower guide rail 10b, or the lower guide rail. Of course, it may be provided on both the upper guide rail 10a and the upper guide rail 10a.

  In the cross-rail type machine tool according to the present invention, since a plurality of deflection correcting mechanisms 12 for correcting the deflection of the cross rail are provided at equal intervals in the longitudinal direction of the guide rail 10b, the wave pattern caused by the deflection of the cross rail is caused. The wheel of the grinding wheel has a short wavelength and a small wave height (amplitude) is transferred. When the wave pattern transferred to the previously processed workpiece is viewed and the operation to reduce the amplitude of the wave is repeated, the deflection of the cross rail converges and the straightness of the workpiece (the workpiece's straightness) Both the straightness in the X-axis direction and the straightness in the Z-axis direction are improved. Further, in addition to correcting the distortion of the cross rail 4 in the vertical (Y-axis) direction and the front (Z-axis) direction by the plurality of deflection correction mechanisms 12, the tool head inclination adjusting mechanism 13 is configured to bend the cross rail 4 in the X-axis direction. Can be finely adjusted, so that the deflection of the cross rail can be corrected to a smaller deflection.

It is a perspective view of a cross rail fixed type surface grinding apparatus. It is the side view which looked at the cross rail from the D direction in FIG. FIG. 3 is a front view in which a cross rail is partially cut away when viewed from the direction A in FIGS. 1 and 2. FIG. 3 is a front view of a cross-rail deflection correcting mechanism and a tool head tilt adjusting mechanism enlarged from a B direction in FIG. 2. FIG. 5 is a side view of the tool head inclination adjusting mechanism as viewed from the direction of arrow C in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Cross rail fixed type surface grinder 1 Bed 2 Table 3 Column 4 Cross rail 5 Saddle 6 Slide stand 7 Tool head 10 Guide rail 12 Deflection correction mechanism 13 Tool head inclination adjustment mechanism

Claims (3)

  A cross rail is installed in which a cross rail is stretched horizontally on a pair of standing columns, and a saddle attached with a tool so as to face the work position on the bed is reciprocally moved on the cross rail. A rail type machine tool, wherein the cross rail is provided with a pair of guide rails on which the saddle travels horizontally spaced apart on the side surface of the cross rail frame, and a lower part of the pair of guide rails; A concave portion is provided in the longitudinal direction at a substantially central portion of the guide rail provided in the guide rail, and a plurality of cavities are provided in the concave portion of the guide rail at equal intervals in the longitudinal direction, and a pair of inclined blocks are provided in each of these cavities. Inserted up and down, this one inclined block is fixed to the cross rail frame, and the other inclined block can slide on the inclined surface of the fixed inclined block to the cross rail frame with an adjusting bolt Characterized in that it constitutes the to Tagged deflection correction mechanism Ri, Kurosure - Le machine tool.   A cross rail frame in the vicinity of which the saddle of the lower guide rail of the cross rail travels is provided with at least one pair of spaces, and a plurality of tool head inclination adjusting mechanisms are provided in these spaces. The cross-rail type machine tool according to claim 1.   The tool head tilt adjustment mechanism is a type that pushes the roller with a wedge block, and is attached to the cross rail frame so that the wedge block advances and retreats in a direction perpendicular to the advancing and retreating direction of the adjustment bolt of the deflection correcting mechanism. The cross-rail type machine tool according to claim 2, wherein the cross-rail type machine tool is provided.

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