JPS6042003Y2 - Boring tool feed correction device - Google Patents

Description

[Detailed description of the invention] The present invention is based on the axial slope of an adjusting rod in which a bite support rod that slidably penetrates the side wall of a cylindrical boring shaft is inserted into the cylindrical boring shaft. The present invention relates to a boring rebit feed-out correction device in a boring machine, which includes a boring machine that is constantly energized to engage a surface, and a detection device that issues a signal when the diameter of the bored hole in a machined workpiece is within the minimum allowable limit.

Conventionally, in such devices, the sloped surface of the adjustment rod is provided so that the bite support rod is pushed out to the side when the adjustment rod slides toward the tip side of the cylindrical boring shaft. A screw feeding device that sends a screw shaft integrated with the adjustment rod so as to increase the boring diameter from the minimum allowable dimension to the maximum allowable dimension, and pushes the cutting tool to the required cutting radius position during the machining feed stroke, and also pushes the cutting tool to the required cutting radius position during the return stroke. In order to co-install a double-acting cylinder that displaces the adjustment rod in the axial direction so that the cutting tool can be retracted to a position without damaging the surface, a complex connection between the drive hydraulic motor of the screw feeding device and the female thread cylinder at its end is required. The double-acting cylinder must be interlocked with a reduction gear mechanism to displace the female threaded cylinder and the adjustment rod as a unit, and the rotation angle regulating device of the screw feeding device, including the proximity switch and its actuating means, must be It cannot be attached to a female threaded cylinder and is installed in the middle of the reduction gear mechanism.

For this reason, when correcting the feeding of the cutting tool, a considerable load is applied to the threaded part of the screw mechanism, which not only tends to cause wear of the thin threaded part, but also makes it difficult to make adjustments after assembling the device. There is a risk that the circumferential distance between adjacent switch actuating means of the rotating pulse generating plate attached to the rotary pulse generating plate may become small, or that the correction of feeding out the cutting tool may become inaccurate due to backlash of the gear.

The present invention addresses this problem by providing the sloped surface of the adjustment rod in such a way that the tool support rod is pushed out to the side when the adjustment rod slides toward the base of the cylindrical boring shaft, and A rod is connected through a thrust bearing, and a double-acting cylinder that allows the rod to slide is installed on the headstock side.In response to the signal issued by the detection device, the boring diameter of the cutting tool is changed from the minimum allowable dimension to the maximum allowable dimension. A screw feeding device that displaces the screw shaft in the same direction by the sliding displacement of the adjusting rod that is increased to The rod is attached to the side, and the rod is brought into contact with the screw shaft only during relative machining feed between the cylindrical boring shaft and the workpiece,
The present invention is characterized in that an automatic control device is provided which controls the double-acting cylinder so as to separate the rod from the screw shaft at other times.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a cylindrical boring shaft rotatably supported by a boring head 3 on a headstock 2; 4 is a cylindrical boring shaft between a motor (not shown) on the headstock and the cylindrical boring shaft 1 or the main shaft; A transmission mechanism, 5 is a tool support rod that slides freely through the side wall of the tip end of the cylindrical boring shaft 1, 6 is a throw-away tool attached to the tip of the tool support rod 5, and 7 is inside the cylindrical boring shaft 1. The adjusting rod 8 is slidably inserted into the adjusting rod 7. Reference numeral 8 indicates a sloped surface in the axial direction cut at the tip of the adjusting rod 7, and the inner end of the tool support rod 5 has a spring mechanism ( (not shown), etc., to constantly engage the sloped surface 8.

The sloped surface 8 is provided so as to push the bite support rod 5 to the side when the adjusting rod 7 slides toward the base of the cylindrical boring shaft (sliding upward in FIG. 1), and A double-rod type double-acting cylinder 11 is mounted on the headstock 2 via a thrust bearing 10 that is slidably supported on the guide member 9 on the headstock 2.
The piston rod 12 is connected to one of the piston rods 12 of the piston rod 12 .

Reference numerals 13 and 14 indicate cylinder chambers on both sides of the piston 15 of the double-acting cylinder 11, 16 indicates the other piston rod, and 17 indicates an adjusting screw screwed into the end of the piston rod 16. The head of the adjusting screw 17 is It faces the screw shaft 19 of the screw feeding device 18 mounted on the headstock 2.

The screw feeding device 18 has a screw shaft 19 screwed into a female screw cylinder 20 which is fixed on the headstock 2 with the same axis as the piston rod 16, and a key is inserted into the cylindrical portion of the screw shaft 19 so that it can only slide freely. The rotary shaft 22 connected to the coupling 21 is interlocked and connected to the output shaft of a hydraulic motor 25 via a large gear 23 and pinion 24 fixed thereto, and one switch operating piece 2 is attached to the large gear 23.
6 (see FIG. 3), one proximity switch 2.7 is installed on the headstock 2 side, and the hydraulic motor 25 is activated by a start signal 29 issued by the detection device 28 and a stop signal 30 issued by the proximity switch 27. By controlling the electromagnetic control valve 31, the hydraulic motor rotates the rotating shaft 22 once, thereby rotating the screw shaft 19.
is fed upward in FIG. 1 by one screw pitch.

The thread pitch of the screw shaft 19 is such that when the adjustment rod 7 is displaced in the same direction by one thread pitch, its sloped surface 8 pushes the tool support rod 5 laterally, and the boring diameter of the tool 6 is adjusted to the minimum allowable dimension. Increase the size to the maximum allowable size.

The detection device 28 includes an internal diameter measuring device, such as an air micrometer 32, which detects the bore diameter of the machined workpiece W' and emits a signal 29 when the bore diameter is at the minimum permissible limit.

The illustrated headstock 2 is mounted on a bed (not shown) so as to be slidable in the direction of the rotational axis of a cylindrical boring shaft, and the headstock 2 is connected to the bed by a feed unit controlled by a suitable limit switch device. The processing feed and return feed for the workpiece W attached to the table are automatically controlled, and the cylinder chamber 13 is connected to the hydraulic pressure source and the cylinder chamber 14 is connected to the tank by the signal issued by the processing feed start switch, and the piston rod 16 The adjusting screw 17 is brought into contact with the screw shaft 19 as shown in the figure, and on the other hand, the cylinder chamber 14 is connected to the hydraulic pressure source and the cylinder chamber 13 is connected to the tank by the signal generated by the return feed operation switch. An automatic control device for the double-acting cylinder 11 to be pulled away from the screw shaft 19 is provided.

In the figure, 33 is a screw shaft of the adjustment rod position indicator that is driven at increased speed via a pinion 34 that meshes with the large gear 23. A cylindrical dog 36 which is freely supported and screwed onto the screw shaft 33 is connected 37 to the dog guide member 35 so that it can only slide freely, so that when the screw shaft 19 is fed upward in FIG. 36 is configured to be sent downward in the figure.

Switch actuating rods 38, 39, 40 which are always pressed against the cylindrical dog 36 are slidably attached to the dog guide member 35, and limit switches 41 are mounted on the headstock side facing each of the switch actuating rods. , 42.43, and the cylindrical dog 36
A circuit is provided to light up a separate signal lamp when each of the limit switches is activated.

As shown in FIG. 2, a steel ball 44 is interposed at the inner end of each switch actuating rod, for example, 38, to facilitate regulating the inner end position of each switch actuating rod, which is constantly pushed by a spring 45. Good.

According to the above configuration, when the headstock 2 is processed and fed, the cylinder chamber 13 of the double-acting cylinder 11 becomes the high pressure side and the head of the adjusting screw 17 is brought into contact with the screw shaft 19. The tool support rod 5 is pushed out to a processing position of a required boring diameter, and the workpiece W is bored as shown in FIG. 1 by the tool tool 6 which is driven and rotated together with the boring shaft 1.

When the required boring is completed and the headstock 2 is sent back, the cylinder chamber 14 becomes the high pressure side, and the adjusting screw 17 is turned on the screw shaft 19 until the piston 15 reaches the position shown by the chain line in FIG.
Since it is pulled further apart, the sloped surface 8 is displaced downward in FIG.

The boring diameter of the workpiece W', which has been completely bored in this way, is measured by the air micrometer 32, and when the boring diameter reaches the minimum allowable limit due to wear of the cutting tool 6, the detection device 28 outputs a signal 29. Then, the screw shaft 19 is sent upward in FIG. 1 by one pitch after one rotation by the screw feeding device 18.

Therefore, when the cylinder chamber 13 becomes the high pressure side and the adjusting screw 17 comes into contact with the screw shaft 19 during boring of the next workpiece W, the tool support rod 5 is pressed until the boring diameter of the tool 6 reaches the maximum allowable dimension. is extruded by the sloped surface 8, and the workpiece W is always bored within the tolerance range.

The initial position of the screw shaft 19 when replacing the cutting tool 6 is set by turning on the signal lamp with the switch 41 and adjusting the adjustment screw 17, and the final position of the screw shaft or the completion position of the feeding correction of the tool is determined by the switch 42. Detected by lighting of signal lamp.

The switch 43 is provided for negative correction of the boring diameter of the cutting tool, but also has a function of detecting the retraction limit of the cylindrical dog 36.

In the illustrated embodiment, the screw shaft 1 when correcting the feeding of the cutting tool
The reason why the rotation angle of 9 is set to one rotation is so that the correction amount can be accurately regulated even when a proximity switch is used.

According to the present invention, when correcting the feeding of the cutting tool, the sliding resistance of the adjustment rod 7 with the cutting tool support rod 5 engaged with the slope surface 8 does not act as a valley load, but is simply the screwing resistance of the screw shaft 19. , it is possible to prevent wear of the threaded part, and also to accurately detect the rotation angle of the screw shaft, and to adjust the boring radius of the tool by turning the adjustment screw 17 left and right after assembling the device or replacing the tool. It also has the advantage of being able to be adjusted accurately.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional plan view, Figure 2 is a sectional view taken along line XX in Figure 1,
FIG. 3 is a view taken along the Y arrow in FIG. 1... Tubular boring shaft, 2... Headstock,
3...Boring head, 5...Bite support, 7...Adjustment rod, 8...Slope surface, 1
0...Thrust bearing, 11...Double rod type double acting cylinder, 12.16...Zeston rod,
17...Adjustment screw, 18...Screw feed device, 19...Screw shaft, 25...Hydraulic motor, 28...Detection device , W...Work.

Claims (3)

[Scope of utility model registration request] (1) A tool support rod that slidably passes through the side wall of the cylindrical boring shaft is always engaged with the sloped surface in the axial direction of the adjustment rod that is slidably inserted into the cylindrical boring shaft. with a boring machine,
In a boring machine that includes a detection device that emits a signal when the bored diameter of a machined workpiece is at the minimum allowable limit, the tool support rod is moved when the sloped surface of the adjustment rod is slid toward the base of the cylindrical boring shaft. A rod is connected to the base end of the adjustment rod via a thrust bearing, and multiple cylinders are installed on the headstock side so that the rod can slide, and the rod is pushed out to the side. , a screw feeding device that displaces the screw shaft in the same direction by the sliding displacement of the adjustment rod that increases the boring diameter of the cutting tool from the minimum allowable dimension to the maximum allowable dimension, when the rod end is in contact with the screw shaft; Multiple cylinders are installed on the headstock side so that they are in the middle of their strokes, and the rod is brought into contact with the helical shaft only during relative machining feed between the cylindrical boring shaft and the workpiece, and at other times the rod is A feeding correction device for a boring tool, characterized in that an automatic control device is provided to control a plurality of cylinders so as to separate the cylinder from the screw shaft. (2) Utility Model Registration In the boring tool feed-out correcting device described in claim (1), the double-acting cylinder is configured in a double-rod shape, and the piston rod is also used as the rod. (3) Scope of claims for utility model registration, paragraph (1) or (2)
In the feeding correction device for a boring rebit machine described in item ), a switch device for controlling one rotation of the screw shaft is installed between the rotating shaft of the screw shaft and the headstock, and the screw pitch of the screw shaft is adjusted by adjusting the screw shaft displacement due to the operation of the screw feeding device. equal to .