JP2543532B2 - Inner surface processing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an inner surface processing apparatus for processing the inner surface of a work, for example, a differential gear case of an automobile.

[Prior art]

The inner surface machining of a workpiece is often divided into two steps, rough machining and finishing, from the viewpoint of machining accuracy and cutter life. Therefore, as disclosed in, for example, Japanese Patent Laid-Open No. 61-30309, a cutter having one surface formed for roughing processing and the other surface formed for finishing processing is rotatably supported to The cutter was reversed according to the processing order.

[Problems to be solved by the invention]

For example, as shown in FIG. 4, it is assumed that the distance between the two inner surfaces 2 of the workpiece 1 to be machined is H. The rotation center at the time of cutting is AA, and the cutter 3 having the diameter D can be inverted in the direction indicated by the arrow with respect to the center O in the thickness direction inside the work 1 when the rotation radius is R <R < Must be H / 2. Further, when the thickness of the cutter 3 is T, R ² = (T / 2)
^{Since it is 2} + (D / 2) ² , the thickness T must satisfy the formula (1).

However, the cutter 3 must have rigidity enough to withstand the cutting load during processing, and there are cases where the formula (1) cannot be satisfied. In this case, ie It is impossible to invert or re-invert the cutter 3 inside the work 1. Therefore, as the processing order, for example, cutter lowering → spindle advancement / cutter holding → right side rough machining → spindle movement / cutter rising position → spindle retraction → cutter rising → cutter reversal → cutter lowering → spindle forward / cutter holding → left side rough machining → Right side finishing → Spindle move / cutter up position → Spindle retreat → Cutter up → Cutter reverse → Cutter down → Spindle advance / cutter hold → Left side finish → Spindle move / cutter up position → Spindle retract → Cutter up 21 It becomes a process. That is, every time the cutter 3 is inverted or re-inverted, the cutter 3 has to be taken out of the work 1, and there is a problem that the efficiency is not improved.

An object of the present invention is to solve the above-mentioned problems and to provide an inner surface machining apparatus capable of efficient machining even when the cutter cannot be inverted inside the work.

[Means for solving problems]

Means for solving the above problems will be described with reference to FIGS. 1 to 3 corresponding to the embodiment. 1 is a front sectional view of the present invention, FIG. 2 is a sectional view taken along the arrow B in FIG. 1, and FIG. 3 is an enlarged sectional view of a portion C in FIG.

4 is a cutter for roughing on both sides. 5 is a cutter for finishing on both sides. Reference numerals 6 and 7 denote supports that rotatably hold the cutters 4 and 5, and are movable in the X direction with respect to the holder 8. The holder 8 supports 6 and 7 at predetermined intervals.
And is movable in the Z direction with respect to the guide 9. Further, the guide 9 is movable in the Y direction with respect to the frame 10 fixed at a predetermined position.

[Action]

The machining order in the above configuration is, for example, the guide (that is, the cutter 4) descending → spindle advancement / cutter holding → right side rough machining → left side rough machining → spindle movement ・
Guide up position → Spindle retract → Guide up → Holder move → Guide (that is, cutter 5) down → Spindle advance / cutter hold → Right side surface finishing → Left side surface finishing →
The 16 steps are: spindle movement / guide up position → spindle retract → guide up → holder return. If the holder return, which is the final step, is performed at the same time when the work 1 is removed from the machining position, the number of steps is 15 steps. Therefore, 6 steps can be shortened as compared with the conventional inner surface processing apparatus.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 is a front sectional view of the present invention,
2 is a view as seen from the arrow B in FIG. 1, and FIG. 3 is a C in FIG.
It is an expanded sectional view of a part.

4 is a cutter for roughing on both sides. 5 is a cutter for finishing on both sides. Reference numerals 6 and 7 denote supports that rotatably hold the cutters 4 and 5, and are movable in the X direction along a guide bar 11 fixed to the holder 8. The holder 8 holds the supports 6 and 7 at a predetermined interval, the convex portion 12 fits into the concave portion 13 of the guide 9, and is movable in the Z direction by the cylinder 14. Guide 9 is framed by cylinder 15
It is movable in the Y direction along a guide bar 16 fixed to 10. Further, 17 is a spindle for driving the cutters 4, 5, and a tip portion 18 is formed in a prismatic shape that fits into a square hole 19 inside the cutters 4, 5, and a surface 20 contacts the cutters 4, 5. Reference numeral 21 denotes a driven side spindle, which has a tapered surface 23 at a tip end thereof for engaging with a tapered hole 22 inside the cutters 4 and 5. The spindles 17 and 21 are a pair of units 24 arranged to face each other,
Each of them is rotatably supported by 25, and moves forward and backward along the same straight line in the X-axis direction as the units 24 and 25 move forward and backward, and when both move forward, the cutters 4 and 5 are held by the tip portion 18 and the tapered surface 23. . 26 is a drive motor for rotating the spindle 17 about its axis. Further, the spindle 17 can be positioned around the axis, and always stops at a predetermined position. Therefore, the square holes 19 of the cutters 4 and 5 are always in the same direction,
That is, when the rectangular holes 19 of the cutter 4 and the cutter 5 are translated in the Z direction, they are in a position where they overlap each other.

First, when the work 1 is positioned by a clamp device (not shown), the cylinder 15 operates and the guide 9 descends, and the cutter 4 is placed at a predetermined position on a straight line connecting the spindles 17 and 21. Next, the units 24 and 25 are moved forward, and the cutters 4 are held by the spindles 17 and 21. That is, the tip portion 18 is fitted into the square hole 19, the surface 20 is brought into contact with the tapered surface 23, and the tapered surface 23 is brought into contact with the tapered hole 22. When the spindle 17 is subsequently rotated around the axis by the drive motor 26, the cutter 4 also rotates in the same direction. When the unit 24 is moved forward at a predetermined speed and the unit 25 is moved backward at the same speed from this state, the cutter 4 causes the spindles 17 and 21 to move.
While being positioned and held between them, the right inner surface 2a of the work 1 is roughly machined. After processing to the predetermined position, the units 24 and 25 are respectively operated in the opposite directions to the above, and the left inner surface 2b is roughly processed by the cutter 4. After processing to the prescribed position, operate the units 24 and 25 in the opposite direction again,
Return the cutter 4 to the initial lowered position. After the rotation of the drive motor 26 is stopped at this position, the units 24 and 25 are retracted to separate the spindles 17 and 21 from the cutter 4.
Subsequently, the guide 9 is raised. Next, the cylinder 14 is operated to move the holder 8 in the Z-axis direction, and the cutter 5
The axis of is parallel to the axis of the spindle 17 in the XY plane. After that, the same operation as in the case of rough machining described above is performed, and the right inner surface
2a and the left inner surface 2b are finished.

In this embodiment, in order to position the square holes 19 of the cutters 4 and 5, the spindle 17 can be positioned in the axial direction.
If the cutters 4 and 5 in which the positions of 19 are aligned are connected by a chain or the like and rotated at the same angular velocity, the spindle 17 is not required to be positioned in the axial direction.

[Effects of the Invention] As described in detail above, according to the present invention, the setup process for setting the cutter can be reduced by about 30% when the cutter cannot be inverted inside the work. There is an effect that the efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front sectional view of the present invention, FIG. 2 is a sectional view taken along the arrow B in FIG. 1, FIG. 3 is an enlarged sectional view of a C portion in FIG. 1, and FIG. 4 is an explanatory view of a conventional example. . 1: Work piece 2: Inner surface 3, 4, 5: Cutter 8: Holder 9: Guide 17, 21: Spindle 24, 25: Unit

Claims (1)

(57) [Claims] 1. A pair of spindles, which are opposed to each other on the same axis as the axis of a machining portion of a workpiece positioned at a predetermined machining position and are movable in the axial direction, and a cutter can be rotated at one end. A holder that supports the support supported in the above-mentioned manner so as to be movable in the axial direction, and a driving means that moves the holder in a direction orthogonal to the axial center, and insert the cutter into the inside from the side surface of the work, In an inner surface processing apparatus that holds a cutter with a pair of spindles to process an inner surface of a work, a guide that supports a holder movably in a predetermined direction with respect to each of the directions is provided in the drive unit, and the holder is provided with a predetermined guide. An inner surface processing apparatus, wherein a plurality of supports are provided in parallel with the axis at intervals, and each support rotatably supports a cutter.