JPH0513481Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cut tracking mechanism of a center rest of an internal grinder for a long-axis workpiece, etc., which makes a cut on the headstock side.

Conventional technology Conventionally, in order to perform internal grinding on the tip of a long-axis workpiece, the position near the tip of the workpiece is supported by a center rest, but a mechanism that performs cutting by moving the headstock in the X-axis direction In internal grinding machines, if the center rest was fixed to the bed, it would not be possible to follow the depth of cut, so an overhead type was used in which the center rest was attached to the tip of an arm attached to the top of the headstock.

Problems that the invention aims to solve Overhead type work rests have a large rigidity problem and are difficult to adapt to relatively long workpieces.Furthermore, the large-scale structure results in high machine prices, and work efficiency. The problem was that it worsened the situation.

Measures to Solve the Problem Straddle the table in the X-axis direction at a position near the headstock 5 of the bed 1, and mount it on the mounting surface 1c in the Z-axis direction.
A gate-shaped fixed base 6 is fixed so that its position can be adjusted in the axial direction.
, an arm 23 that is provided protrudingly on the cutting table 3 and has an arm portion 23a in the moving direction of the table; and an arm 23 that is provided on the gate-shaped fixed table so as to be movable in the X-axis direction and has a gap with the arm portion of the arm. It has a movable base that is engaged with the movable base, and a center rest 30 that is fixed to a position corresponding to the center of the main shaft on the movable base.

Embodiment An embodiment of the present invention will be described below based on drawings of an internal grinder. Bed 1 as shown in Figures 1 and 2.
A table 2 is movably placed on a sliding guide surface 1a in the Z-axis direction cut on both front and rear sides of the upper surface of the
An internal grinding wheel shaft unit (not shown) is fixed to the upper surface of the table 2. A lower cutting base (not shown) having a sliding guide surface in the X-axis direction is fixed to the upper left side of the bed 1, and a cutting base 3 is movably provided on the lower cutting base. A main shaft 4 is rotatably supported on the upper surface of the cutting table 3 by a plurality of bearings (not shown).
A headstock 5 equipped with a spindle 5 is fixed in the Z-axis direction so as to be finely adjustable in rotation, and a chuck 7 is fixed to the tip of the main spindle 4 to grip the rear end of the workpiece W. A mounting surface 1c having a T-groove 1b parallel to the Z-axis sliding guide surface 1a is provided at a position from the headstock 5 on both the front and rear surfaces of the bed 1 parallel to the Z-axis sliding guide surface 1a.
On this mounting surface 1c, a gate-shaped fixing base 6 is positioned across the table 2 in the X-axis direction, and its position is adjusted in the Z-axis direction by a tightening handle 9 that is screwed onto a T-bolt 8 that is inserted into the T-slot 1b. Possibly fixed. As shown in FIG. 3, a guide rail 10a of a known linear guide 10 is fixed in the X-axis direction to the upper surface 6a of the fixed base 6 by a plurality of bolts 11, and furthermore, a plurality of bolts 13
The lower surface of the movable base 12 is fixed onto the slider 10b of the linear guide 10, and the movable base 12 is
It is provided to be able to move smoothly in the axial direction. And the side surfaces 12a, 12b and the front end surface 1 of the moving table 12
Waterproof sheet metal covers 16, 17, and 18 are fixed to 2c with a plurality of bolts 19 via strip-shaped mounting washers, and a long rectangular box-shaped cover 20 is also fixed to the rear end of the moving table 12. .

An arm 23, one side of which is fixed on the front side of the upper surface of the cutting table 3 at a position near the tip of the main shaft 4, has an engaging arm portion 23a that is parallel to the Z-axis sliding guide surface 1a of the bed 1. It is loosely inserted into a groove 26a in the Z-axis direction of a concave-shaped bracket 26 fixed to a position near the front end of the top surface 12a of the movable table by a plurality of bolts 25, with the side surface facing the groove 26a of the bracket 26 and facing outward. The movable table 12 is held without any gap by two centering adjusting bolts 27 installed horizontally from the center, and the movable table 12 can be adjusted to move in the X-axis direction and can follow the movement of the cutting table 3 in the X-axis direction. It is now possible to move smoothly. As shown in FIGS. 4 and 5, a center hole 30 is provided at a position corresponding to the center of the main shaft on the top surface 12a of the moving table.
Mounting part 30 in which a and a long turning hole 30b are drilled.
three radially movable shoes 29 having a
A known center rest 30 equipped with the movable table top surface 1
It is rotatably fixed by two stud bolts 38 and nuts 39 implanted at corresponding positions around the center of the main shaft 2a. Furthermore, a lower dressing table 31 having a dovetail sliding guide surface 31a in the Z-axis direction on the right side of the upper surface is fixed to a position near the rear end of the upper surface 12a of the moving table with the right half protruding. A middle base 32 having a dovetail sliding guide surface (not shown) in the X-axis direction is provided on 31a so that it can be moved in the Z-axis direction and clamped by a bolt 33.
2. An upper table 36 having a mounting shaft 35 on which a diamond tool 34 facing forward in the X-axis is fitted is mounted on a dovetail-shaped sliding guide surface on the upper surface in the X-axis direction and is clamped by a bolt 37. possible.

Function The installation position of the center rest 30 in the Z-axis direction is determined by the support position that changes depending on the axial length of the long-axis workpiece W, which has a straight hole that requires grinding near the tip. . Bracket 2
The adjusting bolt 6 is loosened, the tightening handle 9 is loosened, and the fixing base 6 is moved in the Z-axis direction along the T-groove 1b of the mounting surface 1c, positioned at a predetermined installation position, and fixed by the handle 9. be done. Then, the position of the moving table 12 in the X-axis direction is adjusted by the adjusting bolt 27 so that the support center of the workpiece of the center rest 30 and the main shaft 4 are concentric with each other, and the arm 2
The cutting table 3 and the movable table 12 are integrated by sandwiching the side surfaces of the arm portions 23a of 3 with adjusting bolts 27 without any gaps. A position near the rear end of the workpiece W is gripped by the chuck 7, and the shoe 29 of the center rest 30 is adjusted to move in the circumferential direction so that the center of the workpiece is concentric with the center of the spindle, and the workpiece W is held centered near the tip. The rest 30 is supported for smooth rotation by the tip of the shoe 29 without any gaps.

Next, the tip position of the diamond tool 34 is adjusted by moving the middle stand 32 in the Z-axis direction and the upper stand 36 in the X-axis direction, and is clamped by the bolts 33 and 37, and the main shaft 4 is turned to rotate the workpiece W, and the inner The grinding wheel head is rotated, the table 2 is sent in the Z-axis direction, and the grinding process is started. During grinding, cutting is performed by moving the cutting table 3 in the X-axis direction, but the center rest 30
The diamond tool 34 always maintains its position relative to the center of the spindle and is smoothly moved following the cutting feed. When rotating the workpiece W or changing the setup, the headstock 5 may be moved largely in the X-axis direction, but even at this time, the relative positions of the spindle 4, center rest 30, and diamond tool 34 are always kept constant. It can be done. In addition, when grinding a taper hole, it can be handled by rotating the center rest 30 in accordance with the rotation angle of the headstock 5.

Effects As described in detail above, the present invention is designed to reduce the amount of workpieces that are located outside the sliding guide surface in the Z-axis direction of the bed of a long-spindle workpiece internal grinder that performs cutting by moving the headstock in the X-axis direction and near the headstock. A gate-shaped fixed base in the X-axis direction that straddles the table is fixed on the mounting surfaces provided on both the front and back sides of the table, and a movable base is provided on the fixed base so as to be able to move smoothly in the X-axis direction. A center rest is fixed at a position corresponding to the center line of the upper spindle, and an arm with an arm that is parallel to the sliding guide surface in the Z-axis direction of the bed and perpendicular to the movable base is protruded from the notch base, and the movable base is attached to the arm part. Even if the cutting table is moved in the X-axis direction to make a cut, the center rest will naturally follow and keep the relative position of the main shaft and center rest constant, making it easier to cut the depth of cut. There is no need to adjust the position of the center rest each time, the structure is simple, and even long and relatively heavy long-axis workpieces can be stably supported, which has the effect of significantly improving workability.

[Brief explanation of the drawing]

Figure 1 is a top view of the present invention, Figure 2 is a side view of the present invention, Figure 3 is a sectional view taken along line A-A in Figure 1, Figure 4 is a front view of the center rest, and Figure 5 is a side view of the present invention. B- in Figure 4
It is a sectional view from B. 1... Bed, 2... Table, 3... Cutting base, 5... Headstock, 6... Fixed base, 12... Moving base, 23... Arm, 30... Center rest, 3
4...Diamond tool, W...Workpiece.

Claims (1)

[Scope of utility model registration request] The table is movable in the Z-axis direction on the bed, and a chuck fitted to the tip of the spindle grips a position near the rear end of the workpiece, and a center rest supports the position near the tip, and the table is mounted on the cutting table. X of the headstock
In a long-axis workpiece processing machine that cuts into a tool on a table by moving in the axial direction, the Z
a gate-shaped fixing base fixed on an axial mounting surface so as to be adjustable in position in the Z-axis direction; an arm protruding from the notch base and having an arm in the movement direction of the table;
A movable base is provided on the gate-shaped fixed base so as to be movable in the X-axis direction and is engaged with the arm portion of the arm without a gap, and a center rest is fixed on the movable base at a symmetrical position with respect to the main axis. A center rest cut tracking mechanism characterized in that the center rest moves following the movement of the headstock in the X-axis direction.