JPS6190872A - Original position keeping unit of spring rear face grinding wheel in spring grinding machine - Google Patents

Abstract

PURPOSE:To always perform excellent spring grinding work by keeping the top face of a spring rear face grinding wheel at almost the same level as the absolute datum surface which is at the same level as the spring placing plane of a machine body. CONSTITUTION:When the increasing amount of spring height of a coil spring 86 after being ground excesses the allowable maximum amount, the upper end of the coil spring 86 after being ground comes into collision with a disk member 16 forcing to move it up. The supporting shaft 14 forced to be moved up makes a swing arm 8 swing around an arm 12 counter-clockwise turning a switch 18 on to output pulse signals. The output shaft of a hydraulic rotary cylinder 62 is rotated in a predetermined direction by a predetermined rotary amount on the basis of these pulse signals to rotate a screw shaft 66 through a clutch 64 in an engaged condition caused by turning on by a level sensor 82 raising a spring rear face grinding wheel 70 by a predetermined amount. And, then, actuation of a hydraulic rotary cylinder 38 rotates a screw shaft 48 to lower a spring top face grinding wheel 58 by a predetermined amount automatically compensating the distance between grinding wheels to a predetermined amount. As a result, a spring 86 is satisfactorily ground.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for automatically maintaining the original position of a lower grinding wheel in a spring grinding machine.

Conventional devices detect the height of the coil spring and automatically move the distance between the upper and lower grindstones closer based on this detection signal, thereby correcting the opposing distance between the upper and lower grindstones that has changed due to wear of the grindstones.

However, with this method, there is a difference in level between the lower grinding wheel and the spring mounting surface of the machine body, and this step causes the coil spring that is inserted into the holding hole of the work table to smoothly move from the spring mounting surface onto the lower grinding wheel. There was a flaw in that it was impossible to migrate. The present invention aims to eliminate the above-mentioned defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a work table of the spring grinder, which is configured to be rotated in a predetermined direction by a rotating shaft (not shown), and is arranged horizontally as shown. On the outer periphery of the work table 2, spring holding holes 4 are transparently provided at predetermined intervals in the thickness direction of the work table 2. 6
1 is a grindstone wear amount detection device, and one end of a swing arm 8 is rotatably supported by a bracket 10. Reference numeral 14 denotes a support shaft whose one end is pivotally supported by the swing arm 8, and a disk member 16 made of superalloy and excellent in wear resistance is fixed to the other end of the support shaft. The support 111114 is supported in a vertical hole provided in the bracket 10 so as to be slidable in the vertical direction. The disk member 16 is attached to the holding hole 4 of the work table 2.
are arranged at a predetermined interval in the vertical direction with respect to the work table 2 directly above the array line. 18 is a touch switch arranged on the bracket IO, and this detection 4
The tip of i111 faces the upper surface of the other end of the swing arm 8. Reference numeral 20 denotes a cylindrical body fixed to the body 22, and a screw rod 24 is rotatably held in a fixed position via a ball bearing. Reference numeral 26 denotes a nut that is slidably fitted onto the inner circumferential surface of the cylindrical body 20, and the nut 26 is threadedly engaged with the screw 24. A key member 28 is provided in the elongated hole formed in the side wall of the cylinder 20 along the longitudinal direction.
are slidably fitted together, the nut 26 is fixed to one side of the key member 28, and the bracket 10 is fixed to the other side.
is fixed.

30 is a handle fixed to the upper end of the screw rod 24;
32 is a spring mounting surface formed on the body. The mounting surface 32 constitutes an absolute reference surface 78, and the work table 2
The lower end of the coil spring 86 fitted into the holding hole 4 is slidably placed on the placement surface 32.

The coil spring 86 is configured to move from above the placement surface 32 to above the lower grindstone 70 as the work table 2 rotates.

34 is a timer, 36 is a solenoid valve, and 38 is a hydraulic rotary cylinder, each of which has a bevel gear 40 fixed to its output shaft. 42 is an electromagnetic clutch, and a bevel gear 44 is fixed to one shaft of the electromagnetic clutch, and the bevel gear 44 meshes with the bevel gear 40. 46 is fi! The gear 48 fixed to the other shaft of the clutch 42 is a screw shaft rotatably supported by a cylindrical body (not shown) fixed to the fuselage, and a nut member 50 is screwed into the screw shaft at an angle of 4°. The nut member 50a is slidably fitted to the inner circumferential surface of the cylindrical body.

A long hole is formed in the side wall of the cylinder along the longitudinal direction, and a key member 50 is slidably fitted into the long hole.
A nut member 50 is fixed to one side, and a support member 52 is fixed to the other side. 54 is a gear fixed to the screw shaft 48, and the gear 54 is connected to the gear 4.
It meshes with 6. 56 is an upper grindstone head held by the member 52.

It has a built-in speed reduction mechanism. An upper grindstone 58 is fixed to the lower end of the output shaft of the head 5G.

The upper end of the input shaft of the head 56 is connected to a rotational drive device (not shown). 60 is a directional control solenoid valve for cylinder control, 62 is a hydraulic cylinder, 64 is an electromagnetic clutch,
66 is a screw shaft, 68 is a lower grindstone head, and 70 is a lower grindstone. The transmission mechanism on the lower grindstone 70 side is the same as the transmission mechanism on the upper grindstone 58 side. The grindstone wear detection device 6 is located behind the upper and lower grindstones 58 and 70 with respect to the rotational direction of the work table 2.

72. 74 is a Molver switch, 76 is a fixed scale shaft installed parallel to the screw shaft 48 on one body 22, and the height of the lower surface of the grinding wheel 58 in a non-wearing state with respect to the set reference surface 78 is shown. A bracket 80 is fixed to the fixed scale @76, and a level sensor 82 is attached thereto.

The level sensor 82 is.

An electrostatic type sensor, an air micrometer, or the like can be used. The detection head of the level sensor 82 faces the polished surface of the lower grindstone 70, and in this embodiment, the distance between the detection head of the sensor 82 and the polished surface of the grindstone 70 is set to 0.1 mm, and the distance is The sensor 82 is set to output an ON signal when it becomes less than 0.1 mm. The polishing surface of the lower surface grindstone 70 in a non-wearing state is adjusted to the same height level as the spring storage surface 32, that is, the setting reference surface 78. The level sensor 82
is connected to a control section (not shown) of the electromagnetic clutch 64, and is configured so that the electromagnetic clutch 64 is disengaged when the sensor 82 outputs an ON signal. Reference numeral 84 indicates an index provided on the support member 52, and is opposed to the graduations of the scale shaft 76. Said touch switch 18. Level sensor 82, electromagnetic clutches 42, 64, timer 34, electromagnetic valves 36, 60
, Molver switches 72, 74, and other electrical equipment are electrically stuffed as shown. ' Next, the operation of this embodiment will be explained.

A case will be described in which the distance between the grindstones 58 and 70 is set to a predetermined value when the wear amount of the upper grindstone 58 and the lower grindstone 7o is zero. First, the switch lever 74 is moved to the manual side to disengage the electromagnetic clutch 64. Next, the screw shaft 66 is rotated manually to adjust the movement of the head 70 along the screw shaft 66.

The polishing surface of the lower grindstone 70 is aligned with the reference surface 78. In this state, the detection head of the level sensor 82 and the grindstone 70
The opposing distance from the polished surface is set to exactly 0.1 mm.

Next, turn the lever of Molver switch 72 to the manual side. This causes the electromagnetic clutch 42 to disengage. Next, when the screw shaft 48 is manually rotated, the nut member 50 moves in the vertical direction along the screw shaft 48. When setting the grindstone interval to 85 mm, for example, the rotation of the screw shaft 48 is stopped when the index 84 coincides with 85 on the scale of the fixed scale shaft 76. As a result, the distance between the grinding wheels, that is, the facing distance between the polishing surface of the upper surface grindstone 58 and the polishing surface of the lower surface grindstone 70 is set to 85 mm. Next, the screw rod 24 is rotated to adjust the height of the disc member 16 relative to the mounting surface 32.

6. The disk member 1 is set appropriately in accordance with the grinding wheel interval.
The height of 6 is the height of the upper and lower grinding wheels 5 set at a distance of 85 mm between the grinding wheels.
The level is set so that the upper end of the coil spring 86 whose both ends are polished by 8.70 passes close to each other, and the polishing surfaces of the upper and lower grindstones 58.70 are worn away, and the coil spring 86 after polishing is The upper end of the coil spring 86 is set to collide with the lower surface of the disc member 16 when the spring height increases beyond a predetermined value beyond a permissible range. When the wear amount of the grindstone 58, 70 is zero (1), the wear display dial (not shown) is displaying zero. Next, turn the levers of Molver switches 72 and 74 to the automatic side. As a result, a switch provided in the power supply circuit of the coil of the electromagnetic clutch 42 is turned on.

The electromagnetic clutch 42 is engaged. Further, the electromagnetic clutch 64 is
One of the two switches connected in series to the power supply circuit of the coil is turned on. The other switch is set so that when the level sensor 82 is turned off, a relay is activated and the relay is turned on. Next, the grindstones 58 and 70 are driven to rotate, and the work table 2 is rotated in a predetermined direction. The coil springs are automatically inserted one by one into the holding holes 4 of the work table 2 by a separately provided automatic feeding device. The coil spring 86 brought between the grindstones 58 and 70 by the rotation of the work table 2 has both ends polished by the polishing surfaces of the grindstones 58 and 70, and is ground to a predetermined spring height.

The coil spring that has been polished passes through the lower surface of the disk member 16 of the detection device 6, and is then discharged and dropped from the holding hole 4 into the container below by an automatic discharge device (not shown). While the above polishing work was being carried out continuously, the grinding wheel 58
゜70 The polishing surface wears, and the distance between the grinding wheels increases by the amount of wear. As a result, both ends of the coil spring are not sufficiently ground and polished, and the spring height of the coil spring 86 after polishing increases. At this time, when the opposing distance between the polishing surface of the grindstone 70 and the detection head of the level sensor 82 exceeds 0.1 mm due to wear of the polishing surface, the power supply circuit of the coil of the electromagnetic clutch 64 is closed and the electromagnetic clutch 64 is engaged. If the amount of increase in the spring height of the coil spring 86 after grinding exceeds the allowable value, the coil spring 86 after grinding
The upper end of the 5-disc member 16 collides with the disc member 16 and pushes the disc member 16 upward. As a result, the support shaft 14 rises, and the brake arm 8 swings about the shaft 12 in a direction counter to the rotation of the hour hand in the figure, and comes into contact with the shaft of the touch switch 18 . As a result, the touch switch is momentarily turned on and outputs a pulse signal. This pulse signal is supplied to the coil of a solenoid valve 36 via a timer 34. Further, the pulse signal of the switch 18 is supplied to the coil of the solenoid valve 60, and the pulse signal of the solenoid valve 36.
60 spools operate, first the hydraulic rotating cylinder 6
The output shaft of No. 2 rotates a predetermined amount in a predetermined direction, and this rotational movement passes through a bevel gear 90° 92, a clutch 64, and a gear.
This is transmitted to the screw 41166, and the lower grindstone 70 is raised by a predetermined amount. Subsequently, after a predetermined period of time, the output shaft of the hydraulic rotary cylinder 38 rotates by a predetermined amount in a predetermined direction, and this rotational movement is caused by the bevel gears 40, 44, the clutch 42, and the gears 46, 54.
is transmitted to the screw shaft 48 via
As a result of the rotation, the NAND member 50 and the lower grindstone 58 that interlocks the NAND member 50 in the vertical direction are lowered by a predetermined amount.

By automatically performing the above operation one or more times, the amount of wear of the upper and lower grindstones 58, 70 is corrected, and the distance between the grindstones is automatically corrected to a predetermined interval (85 mm).

Note that when the distance between the polishing surface of the lower grindstone 70 and the detection head of the level sensor 82 becomes O,irrim, the level sensor 82 outputs an ON signal, and this ON signal activates a relay, and the power supply circuit of the coil of the electromagnetic clutch 64 is activated. One switch opens and the electromagnetic clutch 64 is disengaged. Therefore, in this state, even if a pulse is supplied to the coil of the electromagnetic valve 60, the grinding wheel 70 does not rise, and its polishing surface automatically maintains the same height level as the absolute reference surface 78. As is clear from the above description, the touch switch 18.
Electromagnetic clutch 64, hydraulic cylinder 62 and electromagnetic valve 60
Haha Based on the output signal of the level sensor 82, the lower grinding wheel 7
Although a means for aligning the grinding wheel surface of No. 0 with the spring mounting surface is constituted, the means is not particularly limited to the configuration shown in the drawings.

In addition, when carrying out the present invention, the tip of the touch switch may be placed directly in place of the disc J6, and since the grinding wheel wear detection device 6 can have various groove structures, the groove structure shown in the figure is particularly suitable. It is not limited. In addition, one output pulse of the touch switch 18 caused both the lower surface grindstone 70 and the upper surface grindstone 58 to move in the approaching direction.

It is possible to adopt an independent movement method in which the lower surface grindstone 70 moves first, and the upper surface grindstone 58 moves alternately in response to the next output pulse of the touch switch 18. Also,
The operation of the solenoid valve 60 may be prevented based on the output signal of the level sensor 82.

As described above, in the present invention, the upper surface of the lower grindstone is at approximately the same height level as the absolute reference plane, which is the same as the spring mounting surface of the machine body. J: Since the coil spring is held in the holding hole of the work table, the coil spring held in the holding hole of the work table smoothly moves from the top of the spring mounting surface to the top of the bottom surface, resulting in the effect that good spring grinding work can always be performed. It is something.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing a preferred embodiment of the present invention. 2... Work table, 4... Holding hole. 6... Grindstone wear detection device, 16... Disc member, 18... Touchment, 24°°°
. Screw rod, 32...$1 facing, 34.
...Timer, 36...Solenoid valve, 38...
・Cylinder, 40...Bevel gear, 42°. ...Electromagnetic clutch, 44...Bevel gear. 48...Screw shaft, 54...Gear. 56...Top grindstone head, 58...Top grindstone, 60...Solenoid valve, 62...Hydraulic cylinder, 64...Electromagnetic clutch, 66...Screw shaft, 68 ...Bottom grinding wheel head. 70...Lower surface grindstone, 78...Setting reference surface. 82...Level sensor

Claims (1)

[Claims] 1. A floor surface that is rotatably supported in a predetermined direction and has a large number of vertically spaced spring holding holes 4 at equal intervals on its outer periphery for holding a coil spring 86 to be ground. A work table 2 that is substantially horizontal to the work table 2, a spring mounting surface 32 arranged below the work table 2 on which the lower end of the coil spring 86 is placed, and a movement path of each of the spring holding holes 4. a pair of upper and lower surface grindstones 58 and 70 for grinding coil springs, which are arranged to sandwich the work table 2 so as to face each other;
An overlong spring detection device 6 located behind the grindstones 58 and 70 and detecting an overlong spring larger than a predetermined spring height in the spring holding hole 4, and detecting the level of the polishing surface of the lower grindstone 70. A level sensor 82 outputs a detection signal when the polishing surface is located at approximately the same level as the spring mounting surface 32;
and means for aligning the grindstone surface with the spring mounting surface.