JPS6327143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an angular grinding machine, particularly a method for grinding a flanged workpiece having an interrupted end face, and a grinding machine.

When grinding both the end face and the cylindrical part with an anguilla grinder, both parts are usually ground and finished at the same time, but when grinding when the end face is circular and has no discontinuities, care must be taken to prevent end face burn. However, there were no particular problems. However, in a workpiece where the cylindrical part is thin and has low rigidity, and the end face area is wide compared to that and there are interrupted parts, the accuracy of the cylindrical part is affected by the change in grinding resistance due to the intermittent grinding of the end face, making it difficult to obtain high machining accuracy. Nakatsuta.

Therefore, the present invention aims to provide a grinding method and a grinding machine that are not affected by changes in the grinding resistance of the end face, and the first invention is to simultaneously grind the end face portion and the cylindrical portion while simultaneously grinding the cylindrical portion. When the grinding is completed, the finish grinding of the end face is completed, and in response to a rough grinding completion signal, the main spindle is moved back to separate the end face from the grindstone, and the cylindrical part is then finish ground. The second invention is a grinding machine that implements the invention of the first method, and is an angle slide grinding machine, in which the tailstock is always biased toward the main spindle, and the main spindle slides in the axial direction. a headstock that is rotatably supported, a driving means for sliding the main spindle, a sizing device that measures the dimensions of the cylindrical portion during grinding, and a rough grinding completion signal from the sizing device that causes the main spindle to retreat. The invention is characterized in that it includes means for controlling.

Embodiments of the present invention will be described below based on the drawings. A tailstock shaft 2 with a center 1 fitted onto the table of a grinding machine (not shown) is always biased by a spring so as to grip the workpiece with a predetermined pressure while the workpiece is being gripped, and the tailstock is supported so as to be slidable in the axial direction. A spindle 5 with a stand 3 and a center 4 fitted thereon is supported so as to be able to slide in the axial direction, and a headstock 6 is mounted on which a swivel driver 7 for rotating a workpiece W is provided integrally with a pulley. , the end face portion W ₁ and the cylindrical portion W ₂ are ground by the angular grindstone 8 while gripping the flanged workpiece W.
Further, on the table or bed, there is a workpiece locator 9 whose filler contacts the end face _W1 of the workpiece W to determine the axial position, and a direct sizing device 10 which measures the dimension of the cylindrical part _W2 during grinding. It is provided. The shaft cylinder 601 of the headstock 6 is prevented from rotating by a key 602, is slidable only in the axial direction, and has a blind hole 603 that fits the center 4 at the end and opens inward.
A main shaft 5 having a hole therein is supported. A first nut 604 having a female thread in the center is fitted into the blind hole 603 and fixed with a set screw 605. Further, a flanged screw 608 is supported by a bearing 607 in a bearing cylinder 606 provided concentrically on the rear side of the shaft cylinder 601 of the headstock 6 . This screw 60
The screw portion 8 is screwed into a fixed first nut 604 and a second nut 609, and a spring 610 is interposed between the nuts to eliminate a back gap. A spline 611 is engraved on the rear part of the screw 608, and a gear 612 that is stopped from moving in the axial direction is fitted with the spline. Further, a first dot 613 and a second dot 614 are provided at the rear end of the screw 608, and the first dot controls the limit switch LS-1 which defines the retreat end of the main shaft, and the second dog defines the forward end of the main shaft. Activate limit switch LS-2. A pulley 616 having an edge turner 7 is supported by a bearing 615 on the outer periphery of a portion of the shaft cylinder 601 that protrudes from the headstock 6 surface, and the workpiece W is rotated by the edge turner 7 which is rotated by a motor (not shown) via a belt. let A piston 619 is attached to a positioning cylinder 617 provided on the headstock 6 in a direction perpendicular to the main shaft 5.
A rack 6 is fitted with a rack 6 carved in the direction of its outer axis.
18 is meshing with the gear 612, and the piston 619 is moved by fluid pressure, so that the screw 608
is rotated to move the main shaft 5 forward and backward. Next, a circuit for driving the piston 619 will be explained. cylinder 61
The chamber 617a on the retreating side of the main shaft 5 of No. 7 is connected to the fluid pressure source side P and the drain tank side T via the 3-position switching solenoid valve 11 and the 2-position switching solenoid valve 12, and a A one-way valve 13 that operates on the discharge side and a rough grinding complete return cylinder 14 fitted with a piston 15 are interposed in parallel. This rough grinding return cylinder 14 has a stroke adjustment stopper 16 for a piston 15 on the end wall of a chamber 14a connected to the two-position switching solenoid valve 12, and a piston penetrating through the end wall of the chamber 14b on the side of the three-position switching solenoid valve 11. 15 piston rods 17 protrude, and a limit switch LS-3 is actuated at the protruding forward end of the piston 15. The flow channels 19, 20, and 21 communicate with each other. One positioning cylinder 617
The main shaft advancement side chamber 617b is the variable throttle valve 22, 24
and one-way valves 23 and 25 in parallel with each other.
The above-mentioned three-position control valve is connected to the speed adjustment valve 26, which has two sets of close adjustment valves arranged in parallel, and a positioning two-position switching solenoid valve 27, which switches between the coarse and fine settings when the main shaft is positioned and moved forward.
Flow paths 28, 29, 30, 3 in the position switching solenoid valve 11
1 and 32. In order to reduce the flow path resistance between the speed regulating valve 26 and the two-position switching solenoid valve 27, a one-way valve 33 that opens in the discharge direction of the chamber 617b is provided in the side passage.

In the present invention configured as described above, when the grinding wheel 8 is in a retreated state, the a side of the 3-position switching solenoid valve 11 is turned on and becomes the I position, and the pressure flow path is moved to the I position where the 2-position switching solenoid valve 12 is in the OFF state. Therefore, the piston 61 is sent to the chamber 617a of the positioning cylinder 617 via the one-way valve 13 and the flow paths 21, 19, 18.
9 is moved, the screw 608 is rotated via the gear 612, the main shaft 5 is moved backward, and the dog 613 turns on the limit switch LS-1 to generate a backward end signal. In this state, the workpiece W is transported between the centers 1 and 4 by a loading device (not shown) or by hand, and the two-position switching solenoid valve 2 is used to rapidly advance the main spindle 5.
7 is turned on to set it to the 3-position switching solenoid valve 1.
The a side of 1 is turned off and the b side is turned on to set the position. As a result, the pressure fluid flows through the one-way valve 13 and the flow path 2.
1, 19, 30, 32 is sent to the chamber 617b of the positioning cylinder 617 via the rough throttle valve 24 of the speed regulating valve 26 and the flow path 28, and the piston 619 is moved in the opposite direction. The fluid in the chamber 617a is discharged to the drain tank via the flow path 18. The movement of the piston 619 in the opposite direction causes the gear 612 to reverse and rotate the screw 60.
8 causes the main shaft to advance rapidly. When the work locator 9 outputs a coarse/fine switching signal at the spindle positioning speed coarse/fine switching position, the two-position switching solenoid valve 27 is turned off, the close side of the speed regulating valve 26 is communicated, and the fluid is passed through the tight throttle valve 2.
2, the moving speed of the main shaft 5 is made low. In response to the sizing signal from the workpiece locator 9, the three-position switching solenoid valve 11 is turned off to the position, and the main spindle feed is stopped. Further, the grindstone 8 is moved forward by a sizing signal from the workpiece locator 9, and the end surface portion _W1 and the cylindrical portion _W2 of the workpiece W are ground as shown in FIG. Cylindrical part
When rough grinding of W ₂ is completed, a signal is output from the sizing device 10. At this point, finish grinding of the end face portion _W1 is completed. The switching solenoid valve 12 is turned on by the rough grinding completion signal from the sizing device 10 and becomes the position, sending pressure fluid to the chamber 14a of the rough grinding completion return cylinder 14. A timer (not shown) turns on the a side of the 3-position switching solenoid valve 11 after △t seconds, and the flow path 19,
18 is connected and the piston 15 under pressure is connected to the chamber 14.
The fluid stored in the cylinder b is sent out to the chamber 617a of the cylinder 617 through the channels 19 and 18. The piston 619 is moved by an amount equivalent to this amount of fluid, and the screw 608 is rotated via the gear 612, so that the main shaft 5
is forced to retreat. The workpiece W moves following the main spindle 5 due to the pressure of the tailstock spindle 2, and the end face portion _W1 separates from the grinding surface of the grindstone 8 as shown in FIG. cylinder 61
The fluid in the No. 7 chamber 617b is discharged from the flow path 28 through the one-way valve 33 in the side path without resistance. The rod 17 of the piston 15 of the rough grinding return cylinder 14 acts on the limit switch LS-3 at the moving end, and this signal turns off both the 3-position switching solenoid valve 11 and the 2-position switching solenoid valve 12. Further, in response to the rough grinding completion signal from the sizing device 10, the grinding wheel 8 is switched from a coarse cutting to a fine cutting, and the cylindrical portion _W2 of the workpiece W is finely ground.
When the cylindrical portion _W2 reaches the fixed size as shown in FIG. 3, the grinding wheel feed is stopped by a signal from the sizing device and spark-out is performed. When the timer is sparked out for the set time, the grinding wheel 8 is rapidly retreated.
The workpiece W is gripped by a loading device or by hand. In response to the spark-out completion signal from the timer, the a side of the 3-position switching solenoid valve 11 is turned on, and the pressure fluid is sent to the chamber 617a of the cylinder 617 via the one-way valve 13 and the flow paths 21, 19, and 18, and the piston 61
9 moves, the main shaft 5 is further retreated by the rotation of the screw 608, the dog 613 turns on the limit switch LS-1, outputs a backward end signal, and the workpiece W is removed.

As described in detail above, according to the present invention, the finish grinding of the end face part is completed when the rough grinding of the cylindrical part is completed, and the spindle is moved back in response to the rough grinding completion signal, so that the end face part is not ground. In order to perform close grinding of the cylindrical part, high machining accuracy of the cylindrical part, which is not affected by the end face, can be obtained even in the case of a workpiece that has an interrupted part on the end face and has a weak rigidity of the shaft part. In addition, in the final grinding of the cylindrical part by the close feeding of the grindstone, the end face does not come into contact with the grindstone, so there is no risk of grinding burn on the end face resulting in quality deterioration or defects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the state during rough grinding of the cylindrical part of the workpiece. FIG. 2 is a diagram showing a state in which the main shaft is retracted after rough grinding of the cylindrical portion is completed. FIG. 3 is a diagram showing the state of the cylindrical portion after close grinding and sizing. FIG. 4 is a longitudinal cross-sectional view of the headstock and a diagram of the spindle drive circuit. 3... Tailstock, 5... Main spindle, 6... Headstock, 8... Grindstone, 9... Work locator, 10... Sizing device, 11
...3 position switching solenoid valve, 12...2 position solenoid switching valve for rough grinding complete return, 14...Rough grinding complete return cylinder, 2
6... Speed adjustment valve, 27... 2-position switching solenoid valve for positioning, 608... Screw, 612... Gear, 617... Cylinder for positioning, 619... Piston.

Claims (1)

[Scope of Claims] 1. In an Anguilla cylindrical grinder, the end face and cylindrical part of a flanged workpiece having an interrupted part on the end face are simultaneously ground by plunge cut, and the end face part is finished when the rough grinding of the cylindrical part is completed. The grinding is completed, and upon receiving the rough grinding completion signal, the workpiece is moved toward the main spindle without changing the state of the grinding wheel, the end face is separated from the grinding wheel surface, and fine grinding of only the cylindrical portion is continued. A method of grinding a workpiece that has an interrupted part on the end face. 2. In an anguilla cylindrical grinding machine, a headstock that supports a main spindle so that it can slide in the axial direction, a drive means that slides the main spindle based on a command, and a tailstock that is always biased toward the main spindle that slides in the axial direction. A movably supported tailstock, a sizing device that emits a signal when the cylindrical part of the workpiece is ground to a predetermined size, and a dimensional signal output from the sizing device when rough grinding of the cylindrical part is completed. and a means for retracting the main shaft by a predetermined amount using the driving means for the main shaft.