JPH0411323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hollow space in which a substantially T-shaped hole is formed by a linear through hole (first hole) and a second hole communicating with the straight through hole. The present invention relates to an inner surface machining device suitable for machining the inner surface of a workpiece, for example, machining the inner surface of a differential gear case of an automobile or machining the inner width of a knuckle suspension.

[Background of the invention]

Conventional devices of this type include the following. That is, a pair of spindles whose tips face each opening end of the through hole and are arranged so as to move forward and backward toward the inside of the workpiece on the same straight line, and a circumferential wall of a cutter that is rotatably supported. a cutter holder facing the opening end of the second hole and disposed so as to be movable toward the inside of the workpiece so as to move the cutter to a position intersecting the straight line inside the workpiece, and when the cutter holder enters the workpiece, Inner surface machining, in which the cutter inserted into the workpiece is rotated in the linear direction while being held between the pair of spindles, and the pair of spindles are moved in the linear direction to process the inner surface of the workpiece. It is a device.

However, such conventional devices have the following problems. That is, in general, the inner surface machining (including inner width machining) of a workpiece is often divided into two processes, rough machining and finishing machining, from the viewpoint of machining accuracy and cutter life. Therefore, we prepared two cutters, one for rough machining and one for finishing machining, and first attached the cutter for rough machining to the above-mentioned device and performed rough machining.
Next, it is conceivable to replace it with a finishing cutter and perform finishing processing. However, with this method, the frequency of replacing and installing the cutters is extremely high, which requires a great deal of effort and time.

Therefore, we use one cutter that has a machined surface that can be used for both roughing and finishing, and perform the two processes of roughing and finishing continuously, but this method does not allow damage to the cutter, especially due to the cutting load during roughing. is larger and has a shorter lifespan. For this reason, it is not only uneconomical, but also requires frequent replacement of the cutters, which increases the down time of the processing equipment.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an inner surface processing device that can significantly reduce the frequency of cutting cutter replacement.

[Summary of the invention]

The inner surface machining device of the present invention has one side of the cutter used for rough machining and the other side for finishing machining, and is provided with rotation means that can freely reverse both sides, so that the workpieces can be processed in the above order. For example, by setting the right side rough machining → cutter reversal → left side rough machining / right side finishing → cutter re-inversion (return rotation) → left side finishing, the life of the cutter can be extended, and the frequency of replacement can be reduced. It was calculated by

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a diagram showing the main parts of an embodiment of the inner surface processing apparatus according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a fourth view taken along the line -- in FIG. 1 is a sectional view taken along the - line in FIG. 1, and in each figure, 1 is a frame. A bracket 2 is mounted on the frame 1, and a slider 5 is provided inside the bracket 2 and moved up and down by a cylinder 4 while being guided by a guide bar 3. This slider 5 is also provided with a second guide bar 6.
A holder 7 is provided which can be moved while being guided in the left and right directions in the figure. A spindle 8 is vertically held in this holder 7 by two tapered roller bearings 9, and a cutter holder 10 is attached to the lower end surface of the spindle 8. The cutter 11 is held in the cutter holder 10 by a cap 12 so as to be rotatable around its axis as shown by arrow A in FIG. This cutter holder 10 can be indexed and rotated by 180 degrees around its axis by the rotation means described below. That is, a pinion 14 is fitted onto the upper part of the spindle 8 via a key 13. The pinion 14 meshes with a rack 18 connected to a piston rod 17 of a cylinder 16 in a block 15 mounted on the slider 5. In this case, the block 15 is provided with a stopper 19 for regulating the stroke of the rack 18.

Further, the slider 5 has a cutter holder 10.
A pin 20 for lateral positioning is provided together with a spring 21 and an adjusting nut 22. Further, on one side in the axial direction of the cutter 11 (here, the right side in FIGS. 2 and 3), there is a blade 11A for rough machining, and on the other side (here, on the left side), a blade 11B for finishing machining. , are formed respectively. moreover,
A rotating spindle 23 having a prismatic tip is inserted into the center of the finishing blade 11B, and an engagement hole 11C is formed at the bottom to engage with the tip. A support hole 11D into which the non-rotating spindle 24 is inserted is bored in the center of 11A.

The spindles 23 and 24 move forward and backward in the axial direction on the same straight line as a pair of units (not shown) disposed opposite to each other move forward and backward. 11C and 11D so that the cutter 11 can be held under pressure. Furthermore, spindle 2
3 is rotatable in the direction around the axis, and when the clamping pressure of the cutter 11 is maintained, by rotating the spindle 23, the cutter 11 can be rotated in the direction around the axis.

Next, the operation of the above-mentioned device of the present invention will be explained.
First, a hollow workpiece 25 (see FIG. 3) in which an approximately T-shaped hole (not shown) is formed by a linear through hole (first hole) and a second hole communicating with the straight through hole (first hole) is clamped. When the position is fixed by a device (not shown), pressure oil simultaneously enters the descending side port 4A of the cylinder 4, the slider 5 is lowered, and the holder 7 and cutter holder 10 are also lowered, and the cutter holder 10 is moved to the workpiece 25. Enter the inside of Katsuta 11
is lowered to a predetermined position on the straight line connecting the spindles 23 and 24. Next, move the spindles 23 and 24 forward together, and insert their respective tips into the holes 1 of the cutter 11.
After inserting into 1C and 11D and clamping the cutter 11, the spindle 23 is connected to a drive motor (not shown).
When the cutter 11 is rotated in the direction around the axis, the cutter 11 also rotates in the same direction. From this state, the spindle 23 is moved forward at a predetermined speed, and the spindle 24 is moved back at a slightly slower speed. In this case, the cutter 11 rotates while being clamped between the spindles 23 and 24, and rough-cuts the right side of the inner width of the workpiece 25. When the machining is completed to a predetermined position, the spindles 23 and 24 are each operated in the opposite direction to that described above, and the cutter 11 is returned to its original lowered position. When it returns to that position, the rotation of the drive motor is stopped, and then the spindle 2
3 and 24, and remove them from the cutter 11. Next, put pressure oil into the rising side port 4B of the cylinder 4, and put the slider 5, holder 7, and cutter holder 1 into place.
0, the cutter 11, etc. are raised, and then pressure oil is put into the rotation side port 16A of the cylinder 16, and the rack 18 is driven. When the rack 18 is driven by a predetermined stroke, the pinion 14, spindle 8, and cutter holder 10 are rotated 180 degrees around the axis, the cutter 11 is also rotated 180 degrees, and the cutting blade 11A,
11B is inverted. Subsequently, the cutter 11 is lowered in the same manner as described above, the spindles 23 and 24 clamp the cutter 11, and the cutter 11 is further rotated. Next, the spindle 23 is moved backward at a predetermined speed, and the spindle 24 is moved forward at a slightly faster speed, and the force relationship between them is determined as forward force < backward force (in this case, the forward force is greater than the cutting load).
Then, the cutter 11 is connected to the spindle 2 as described above.
The workpiece 25 is rotated while being clamped between 3 and 24, and the left side of the inner width of the workpiece 25 is roughly machined. After machining is completed to a predetermined position, the right side of the inner width of the workpiece 25 is finished by performing the rough machining operation in the opposite direction. Next, return the cutter 11 to the original lowered position,
After the cylinder 4 is operated and raised, pressure oil is put into the rotation return port 16B of the cylinder 16, and the rack 18 is driven to rotate 180 degrees in the opposite direction to that described above, that is, to return to the original orientation. Then lower it again,
The left side of the inner width of the workpiece 25 is finished by operating in the same manner as the rough machining described above, and then the initial state is returned to complete the cutting process.

In the above-described embodiment, the rotating means of the cutter holder 10 is composed of the pinion 14, the cylinder 16, the piston rod 17, the rack 18, the stopper 19, etc., but it is not limited to this.

〔Effect of the invention〕

As described above, in the present invention, one side of the cutter used is formed for rough machining and the other side is formed for finishing machining, and rotation means that can freely reverse the rotation of both sides are provided, so that the cutter can be used for workpiece processing. For example,
By setting the right side rough machining → cutter reversal → left side rough machining/right side finishing → cutter re-inversion (return rotation) → left side finishing, the life of the cutter can be extended, making it easier to replace the cutter. The effect is that the frequency can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram showing essential parts of an embodiment of an internal surface processing apparatus according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 4
The figure is a sectional view taken along the - line in FIG. 1. 1...Frame, 2...Bracket, 3,6...
...Guide bar, 4, 16...Cylinder, 5...Slider, 7...Holder, 8...Spindle, 9...
…Roller bearing, 10…Cut holder, 1
1...Katsuta, 11A...Blade for rough machining, 11B
...Fishing blade, 14...Pinion, 17...
...Piston rod, 18...Rack, 23...Rotating side spindle, 24...Non-rotating side spindle,
25...Work.

Claims (1)

[Scope of Claims] 1. A device for processing the inner surface of a hollow workpiece in which a substantially T-shaped hole is formed by a linear through hole (first hole) and a second hole communicating with the straight through hole. A pair of spindles whose tips face each opening end of the through hole and are arranged so as to be movable forward and backward toward the inside of the workpiece on the same straight line, and a circumferential wall of a cutter rotatably supported. a cutter holder facing the opening end of the second hole and disposed so as to be movable toward the inside of the workpiece so as to move the cutter to a position intersecting the straight line inside the workpiece, and when the cutter holder enters the workpiece, Inner surface machining, in which the cutter inserted into the workpiece is rotated in the linear direction while being held between the pair of spindles, and the pair of spindles are moved in the linear direction to process the inner surface of the workpiece. In the device, the cutter is formed with a rough cutting blade on one side in the axial direction and a finishing cutting blade on the other side, and the cutter holder is indexed and rotated by 180 degrees in the direction around the axis. An inner surface machining device characterized in that it is provided with a rotating means for arbitrarily reversing the cutter blade between rough machining and finishing machining.