JP3372160B2 - Coil spring both-end grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a compression coil spring.
(In the following description, referred to as a coil spring)
The present invention relates to a grinding machine for grinding a workpiece. [0002] 2. Description of the Related Art Conventionally, both ends of a coil spring are ground as shown in FIG.
A double-headed grinding machine as shown is often used. This one
A pair of cups facing each other rotating about a vertical axis 101
It is provided with shaped whetstones 102A and 102B.
One of them is also movable in the direction of the vertical axis 101,
Has multiple vertical through holes into which coil springs can be inserted
Work guide disk 103 parallel to the vertical axis 101
It is provided rotatable about the second shaft 104. [0003] A coil spring is connected to the work guide disk 10.
Insert into the through hole of No. 3 to give rotation to the work guide disk 103
The two end faces are the same with both grinding wheels 102A and 102B.
Sometimes grinding. In this case, the whetstones 102A, 1
02B cutting is continuous with one grinding wheel 102A or 102B
It is common practice to provide a cut by moving in the vertical axis 101 direction.
And insert a coil spring between the whetstones at regular intervals.
While the work guide disk 103 makes one rotation,
Grinding methods that end grinding are also in practical use. [0004] Also, although not for grinding coil springs,
FIG. 9 shows the technique disclosed in Japanese Patent Application Laid-Open No. 1-310852.
A pair of grindstones 105A and 105B as shown in the work entrance
So that the gap on the side is larger than the gap on the work exit side
Arranged in an inclined manner and continuously rotating the work guide disk 106
Then, the work 107 inserted into the through hole is
Continuously pass several times between 105B, during which one whetstone
By cutting into the surface, Ferai has a relatively large grinding allowance.
Grinding both ends of the work 107 such as
There is a thing. [0005] SUMMARY OF THE INVENTION As described in the prior art,
The method of moving the grinding wheel continuously during grinding to give a cut is
Shrinks by thrust in the cutting direction (grinding pressure) like a coil spring
For workpieces with properties, coil springs with different compression forces
To get the most appropriate infeed speed with the balance of machining accuracy
It is difficult to do so, and if you consider safety and slow down the cutting speed
This increases the required time and increases the amount of wear on the grinding wheel, which is uneconomical.
And it takes time to fix the grinding wheel, resulting in inefficiency.
Problem. In addition, this method
Supply, grinding and discharge are separate processes.
Is difficult. [0006] In addition, once between the whetstones fixed at a certain interval,
The method of finishing both ends during rotation is a large allowance
It is difficult to handle
As a result, the grinding edge of the workpiece is easily burned and discolored by the grinding heat
In addition, there is a problem that the product value decreases. Also,
Because excessive compression is applied to the work during grinding,
There is a problem that the processing accuracy such as the squareness is also poor. Further, a grinding stone disclosed in JP-A-1-310852 is used.
The method of cutting continuously by arranging it in an inclined manner has a large grinding allowance
Effective for workpieces with good machinability such as ferrite,
For grinding both ends of coil spring, cut the above grinding wheel continuously
It has the same problems as the method. [0008] The present invention addresses such problems with the prior art.
It has been considered in light of the subject, and its intended purpose
Performs optimal cutting according to the change in wheel motor load.
In one cycle, the work guide disc
Rotation (intermittent rotation)
Fully automatic with automatic supply, automatic discharge and automatic grinding
Providing an NC-controlled coil spring both-end grinding machine capable of continuous production
It is intended to be offered. [0009] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The coil spring both-end grinding machine of the present invention can rotate
A pair of cup-shaped whetstones are provided at the opposite ends of a pair of whetstone shafts
And at least one of them is in the direction of the grinding wheel axis.CutIt can be moved
Two whetstone shaft heads,The cut is movableGrinding wheel head
First driving means moving in the direction of the stone axis,The pair of whetstones
Second driving means for rotating the respective shafts,On the outer periphery of the disk
Work holding holes drilled at equal intervals and in multiple rowsPart ofBefore
The grinding wheel axis so as to extend between the opposite grinding surfaces of the grinding wheel
Work guide provided rotatable about an axis parallel to
A disk and a second disk for rotating the work guide disk.3Driving means;
Grinding work into the work holding hole of the work guide diskBefore constructionofWah
ToA work supply means for supplying, and
Discharging means for discharging the workpiece after grinding, and during grinding
ToFrom the grinding positionCame outAt a distance away from the whetstone
Of the workMeasure the lengthBy grindingSet in advanceTo the higher value
When it reaches, the upper signal is again set by spark-out grinding.
When the set lower value is reached, lowerLength measuring means for outputting a signal
And during grindingOf the grinding wheel axis on the cutting sideWheel spindle motor current
Measure the value and set in advanceSignal when the upper limit is reached
If the current value drops to a preset lower limit,
Load detection means for outputting a signal;
The first driving means and the second driving means are provided by an output signal from the length measuring means.
2 driving meansAnd the third driving meansAnd means for controlling
SeeIn all of the work holding holes, the work supply means
When supply of the work is completed,Work guidance disk and
The pair of grinding wheel shaftsContinuous rotationAnd the grinding wheel axis on the cutting side
CutOf the current value of the wheel spindle motorSaidOff at upper limit signal
IncludingOnlyStopThe current valueCut at lower limit signalOnlyStart
Intermittent cutting feed of the grinding wheel spindle headAt the same time, always measure the length
Said thatInspection meansSaidUpRankAt the signalGrinding wheel head break
Stop continuous feedEnter the spark outSpark Out
Said inunderRankAt the signalSupplied to the work holding hole
Of all the aforementioned workpiecesFinish the grinding process and the work
Step the work guide disk according to the spacing of the holding holes.
RotateSaidworkDischarge from the work supply means
Of workpiece supply before grindingPerform automatic removalConfigured as
didThings. The coil spring constructed as described above
According to the double-sided grinding machine, multiple work
A coil spring (workpiece) is supplied to all
Is supplied, the work guide disk is continuously rotated,
Of the two rotating wheels, for example, the upper wheel is relatively fast
A close cut is given to approach the workpiece, and the air cut is completed.
Then grinding starts. At the start of this grinding, the current value of the grinding wheel motor
Rises and reaches a preset upper limit, load detection means
Gives an upper limit signal. The cutting of the grinding wheel is stopped by the upper limit signal, and the grinding is stopped.
When the coil spring that escaped with the cutting force is gradually ground,
As the grinding pressure decreases, the current value decreases, and the preset lower limit
When the current value decreases to the value, the lower limit signal is
Get out. This lower limit signal gives the upper wheel a low speed cut,
As described above, cutting stops at the upper limit and restarts at the lower limit
I do. Grinding both ends of the coil spring with such intermittent cutting
Processing proceeds. GrindingSometimesCoil springGet out of the grinding position and grind
Do not hang on the stoneThe length is always measured at a remote location
Is measured and set in advanceRankvalue(In the text below
Upper limit)Above the inspection means whenRanksignal(Less than
In the text, this is called the upper limit signal.)Is output. On thisLimitsignal
Enter spark out withRankValue (hereinafter book
When it reaches the lower limit in the sentence), it falls below the detection meansRanksignal
(Hereinafter referred to as the lower limit signal)Comes out and the upper grinding wheel rises
To return to the upper limit start position. at the same time
When the rotation of the work guide disk is
It changes to the tip rotation, and the workpiece
The coil spring is discharged and a new coil is
The spring is supplied to the work holding hole. [0013] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
It will be explained based on this. Figure 1 shows a coil spring
FIG. 2 is a front view in which the upper part is omitted, and FIG.
FIG. Upper and lower sides of frame 1 installed on the floor
Attachment parts 1a and 1b for the grinding wheel shaft
The upper mounting part 1a is vertically oriented as shown in FIG.
Upper grinding wheel shaft head 3 via two linear guides 2
A is movably mounted on the lower mounting portion 1b.
Similarly, through two vertical linear guides (not shown)
The lower grinding wheel shaft head 3B is movably mounted. The upper wheel head 3A and the lower wheel head 3B are
Both of them consist of a whetstone shaft sleeve 3a and a flange 3b.
The upper grinding wheel shaft 4A and the lower grinding wheel are attached to the grinding wheel shaft sleeve 3a.
The shaft 4B is rotatably supported concentrically and oppositely.
Above the lower end of the upper grinding wheel shaft 4A and the lower grinding wheel shaft 4B.
A cup-shaped upper grinding wheel 5A and a lower grinding wheel 5B at the end
Each is fitted. Upper wheel 5A and lower wheel 5B
Donut shape with relatively large particle size on metal plate 6
It is formed into a cup shape by bolting the hollow whetstone of
Opposite mounting surfaces are ground surfaces 5a, 5a. The upper grinding wheel shaft 4A and the lower grinding wheel shaft 4B have
Passive pulleys 7A and 7B are fitted to the upper and lower ends, respectively.
Grinding wheel motors 8A, 8B fixed to the flange 3b
Drive pulleys 9A and 9B are fitted to the respective output shafts.
Belts 10A and 10B stretched between both pulleys
The upper grinding wheel 5A and the lower grinding wheel 5B are the same via
It is designed to rotate at a constant speed in the direction. Upper grinding wheel
The current value of the motor 8A is constantly measured by a load detector (not shown).
The load detector detects the upper and lower limits in advance.
Is set, and when the current value reaches the upper limit, the upper limit signal
To output the lower limit signal when it falls to the lower limit.
It has become. The flange 3b of the upper wheel head 3A has
Ball screw nut 12 screwed into the screw 11
The ball screw 11 is mounted on the frame 1
A is rotatably supported in parallel with A
And rotated by the NC-driven Z-axis servomotor 14
You. Also, feed to the flange 3b of the lower grinding wheel shaft head 3B.
A nut 16 screwed to the screw 15 is fixed,
Screw 15 can be rotated on frame 1 in parallel with lower grinding wheel shaft 4B
And the round handle 1
8 for manual rotation. Further, a frame is provided below the side plate 1d of the frame 1.
The support shaft 19 is vertically fixed via the rackets 19a, 19a.
And the loading frame 20 is for maintenance
In front of the frame 1 so as to be pivotable about this support shaft 19
It is fixed on the lower side. Down to loading frame 20
The disk drive shaft 21 is rotatably supported in parallel with the side grindstone 5B.
Above the grinding surface 5a of the lower grinding wheel 5B of the disk drive shaft 21.
Work guide circle via sleeve 22
The board 23 is fixed concentrically. The disk drive shaft 21 is shown in FIG.
C-axis servo of NC control via speed reducer 24 as shown in
It is rotated by a motor 25. The work guide disk 23 is circumferentially equidistant on the outer periphery.
A plurality of vertical (2 rows in this embodiment) vertical penetrating
The workpiece holding hole 23a is engraved.
a is such that the coil spring W to be ground can be smoothly attached and detached.
The work guide disk 23 is formed to have a hole diameter
Is set smaller than the free length of W
The work holding hole 23a is rotated by the
A and between the opposite grinding surfaces 5a, 5a of the lower grinding wheel 5B.
In this way, that is, the space between the grinding surfaces 5a, 5a
It can be inserted multiple times. 26 is for dust absorption
It is a duct. The bracket 3 is mounted on the left side plate 1c of the frame 1.
Three guide bars 31A, 31B, 3 via 0, 30
1C is fixed vertically in a triangular shape and has two guide bars.
-Up and down carriage for dressing upper grinding wheel 5A on 31A and 31C
32A is provided so as to be vertically movable, and has two guide bars.
-Up and down carriage for dressing lower grinding wheel 5B on 31B and 31C
32B is provided movably up and down. A vertical moving table 3 for dressing the upper grinding wheel.
2A is connected to the round handle 34A via the vertical feed screw 33A
It can be moved up and down more manually, and it can be used to dress the lower grinding wheel.
32B is a round handle 34B via a vertical feed screw 33B.
Is manually moved up and down. Up and down moving table 32A, 32B
Has T-grooves 32a cut vertically,
Units 35A and 35B are positioned along the T-groove 32a.
It is attached to the center of the whetstone variably,
I have. The dressing units 35A and 35B are horizontal.
Racks are engraved on the side surfaces of the cylindrical bodies 36, 36 facing each other.
A moving shaft (not shown) is provided so as to be movable only in the axial direction.
Sharpening shafts 37, 37 are rotatably supported at the tip of the moving shaft.
A plurality of sets of eyes at the tips of the dressing shafts 37, 37
Stand rings 38A and 38B are fitted. The cylindrical members 36, 36 are engaged with racks of a moving shaft.
A pinion shaft (not shown) having a pinion
It is provided at right angles and rotatable, and the pinion shaft is round
The handle 39A, 39B is fitted and the dressing ring
38A and 38B have round handles 39A and 39B respectively.
It can be fed horizontally by manual rotation.
You. At the front ends of both side plates 1c and 1d of the frame 1
As shown in FIG. 3, the guide bars 41 are vertically
Along the guide bars 41, 41
A front plate 42 is provided to be vertically movable. Under the front plate 42
Grind the coil spring W inserted in the work holding hole on both sides of the surface.
Entrance guide block 4 for feeding stones 5A and 5B
3A and outlet for sending out from grinding wheels 5A and 5B
The guide block 43B is fixed to the guide block 43B.
The lower surfaces of the locks 43A and 43B compress or open the coil spring W.
It is formed on an inclined guide surface for release. A feed screw 44 is vertically and rotationally mounted on the front plate 42.
Nut which is supported so that it can be screwed into the feed screw 44
45 is the upper grinding wheel shaft head 3ARungeFixed to the part 3b
I have. A worm wheel is provided at the lower end of the feed screw 44.
46 is fitted and meshes with the worm wheel 46
A round handle 48 is attached to an orthogonal shaft 47 having an integral worm
Is fitted, and guide is provided by manual rotation of the round handle 48.
The inclined guide surface of the blocks 43A and 43B is set to the upper grinding wheel.5Aof
It is designed to match the ground surface 5a. Round handle 4
An eight clamp mechanism is also provided. The top plate 20a of the loading frame 20
On the right side, a support shaft 51 for the length detector is vertically erected.
The detector main body 53 is placed on the 51 via the swivel arm 52.
It is attached to be adjustable. The lower end of the length detector body 53
And a disk-shaped contact 54 that contacts the upper surface of the coil spring W.
The movable shaft 55 has a relatively movable
It is always urged downward by a weak spring. The length detector main body 53 is shown in parallel with the movable shaft.
Digital counter (measuring and sizing device)
In this digital counter, the height of the movable shaft 55 is
When the preset upper limit is reached and when the lower limit is reached
The upper and lower limit signals are not shown.
Output to the NC device. The upper limit and
The lower limit is that the coil spring to be measured is
The length is measured with the contact 54 pressed by
Set using a model spring with the correct length. Further, the top plate 2 of the loading frame 20
0a, between the work guide disk 23 and the lower grinding wheel 5B
And adjacent arc-shaped notches with a small gap
The fixing plate 60 is fixed, and is shown in FIG. 4 in front of the top plate 20a.
Spring feed pipes of a spring supply device (not shown)
Supply nozzles 63, 63 communicating with the tips of
The holding member 61 is fixed. Each of the supply nozzles 63 has an upper side.
The air cylinders 64, 64 and the lower air cylinder 65,
65 and the spring feed pipe 62
Coil connected to the supply nozzle 63 via the
Thread W is fixed to the piston rod of the lower air cylinder 65.
Closure gate 66 to close and dam, supply work of NC
The second coil from the bottom with the upper air cylinder 64 on command
With the side surface of the spring W pressed to prevent falling,
Open the gate 66 with the air cylinder 65 to guide the work
The lowermost coil spring W is inserted into the work holding hole 23a of the disk 23.
Are supplied one by one. On the top plate 20a of the loading frame 20,
Is a duct for discharging the ground coil spring W on the left side.
The fixing plate 60 is open as shown in FIG.
A square notch 60a is engraved at the position corresponding to the hole.
The notch 60a can swing around the shaft 73.
Work opening / closing plate 67
It is always closed and air only when the coil spring is discharged.
It opens as indicated by the virtual line by the Linda
You. Further, the left side of the loading frame 20
Forcibly discharge via the support member 68 at the position corresponding to the duct
Air cylinder 69 is mounted vertically,
The holding plate 71 is attached to the lower end of the piston rod 70 of the
The two work pushing pins 72, 72 face downward
When the work discharge opening / closing plate 67 is opened,
The work push-out pins 72, 72 descend to the ground
The coil spring W is inserted into the work holding hole 23 of the work guide disc 23.
Forcibly extruded from a and discharged to duct
ing. Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to the flowchart of FIG. Step S1
At a hopper from a spring supply device (not shown).
Coil spring W is continuously fed in, and two
Cores stored in series in the
The upper spring is activated by the NC workpiece supply command.
By the action of the cylinders 64, 64, the second coil
The side of the nee W is pressed to prevent it from falling, and at the same time,
The gate 66 opens by the action of the air cylinders 65, 65,
The bottom coil spring W is paused in step mode.
Work holding holes 23 in the same row of the work guide disk 23
a, 23a. NC system in step S2
Work guide disk 23 works by your C-axis motor 25
One step at intervals of holding holes 23aEachIs rotated and
In step S3, the work guide disk 23 rotates 360 °.
Is determined, and if NO, the process returns to step S1.
You. In the case of YES in step S3,
In step S4,Work guide with servo motor 25
Rotate the disk 23 and grind it with the grindstone motors 8A and 8B.
While rotating stones 5A and 5BZ-axis mode of NC control
Upper side through a speed reducer 13 and a ball screw 11
Grinding stone 5A is relatively from the machining start position of the upper limit in the Z-axis direction.
A fast high-speed cut is started. In step S5,
Upper limit at which the current value of upper wheel motor 8A is set in advance
It is confirmed whether or not the value has been reached, and if NO, step S
In 6, the digital camera incorporated in the length detector main body 53
It is checked whether the upper limit signal is output from the counter. Then, in the step S6, YES
In some cases, during air cutting before grinding or immediately after grinding starts
The coil spring W has no grinding allowance because the upper limit signal is
Very few, if any, defective workpieces and machines
Alarm is stopped and the display device informs the operator of this.
Let If NO in step S6, the step
It returns to step S4. In the case of YES at step S5,
In step S8, the high speed cutting of the upper grinding wheel 5A is stopped.
Stop and continue grinding with the grinding pressure stored during cutting.
You. Then, in step S9, the upper grinding wheel motor 8
The current value of A is the lower limit value preset in the load detection device
Check if it has dropped to, if NO, step S
At 10, the digital counter outputs the upper limit signal again.
Is confirmed. Then, in step S10, N
In the case of O, the process returns to step S8, and in the case of YES,
Is sent to step S17 described later. In step S9, if YES
Is a low-speed cutting of the upper grinding wheel 5A in step S11.
Start, and in step S12, the upper grinding wheel
Check whether the current value of the motor 8A has reached the upper limit. Soshi
If NO in step S12,
At 13, an upper limit signal is output from the digital counter.
Is determined, and in the case of YES, the process proceeds to step S17 described later.
Sent.If NO, the process returns to step S11.
You. Step S12AtYESIn the case of
Is a low-speed incision of the upper grinding wheel 5A in step S14.
Is stopped, and in step S15, the upper grinding wheel
Check whether the current value of the resistor 8A has reached the lower limit. Soshi
If NO in step S15,
In S16, the upper limit signal is again output from the digital counter.
It is confirmed whether or not it has come out, and if NO, step S14To
ReturnedYou. If YES in step S15,
The process returns to step S11. In step S16, if YES
If YES in steps S10 and S13 described above,
When the upper limit signal is output from the digital counter
In step S17, the cutting of the upper grinding wheel 5B is performed.
Stop and enter into the last spark-out grinding
You. In step S18, spark out
Check if lower limit signal is output from digital counter during grinding
If NO, the process returns to step S17, and YES
In step S19, the upper grinding wheel 5A
Start of the upper limit in the Z-axis direction at the feed speed (highest speed)positionBack to
All the work holding holes 23 of the work guide disc 23
The grinding of the plurality of coil springs W inserted in a is completed.
You. Next, the coil spring W which has been ground is automatically discharged.
Out operation, and in step S20, C of NC control
Work guide disk 23 is set to the origin by axis servo motor 25
The push pins 72, 72 for forced ejection are positioned
When it is concentric with the work holding hole 23a of the work guide disk 23,
Work feed pipe of work supply device (not shown)
62, 62, the supply nozzles 63, 63 at the tip end have different phases.
It is concentric with the upper work holding hole 23a. Next, in step S21, FIG.
As shown in FIG.
The opening / closing plate 67 covering the notch portion 60a of FIG.
The pushing pins 72, 72 are actuated by the action of the air cylinder 69.
The coil spring W that has descended and ground has been moved to the work holding hole 23a.
Is discharged from In step S22, the work guide disk
23 is rotated one step, and in step S23,
It is confirmed whether the work guide disk 23 has rotated 360 °,
If NO, the process returns to step S21, and if YES,
If that is the end. The operation according to the above-described flowchart is as follows.
Insert all the work holding holes 23a of the work guide disc 23
After automatically supplying the ill spring W and grinding both ends
And shows one cycle of operation until automatic ejection
Yes, in fact, the cycle continues endlessly unless there is a problem.
It is to be processed continuously. The above-mentioned grinding is one of the factors that hinder continuous machining.
Unless a defective coil spring W is supplied,
There are clogged stones. Clogging occurs on grinding wheels 5A and 5B
Then, the sharpness deteriorates and the grinding in the unit processing time
The amount decreases. Therefore, the grinding amount can be reduced by an NC device (not shown).
Remembers the maximum machining time that matches, even if the set time has passed
When the grinding process is not completed, a clogging signal is output to
The machine stops. Therefore, the sharpening operation of the grindstones 5A and 5B will be described.
Will be described. Whetstone can be sharpened with upper grinding wheel 5A
The operation is performed in the state where it is positioned at the active position. First, the upper
The dressing ring 38A at the tip of the dressing unit 35A is on the upper side
Vertical position to lightly hit grinding surface 5a of whetstone 5A
After deciding, turn the round handle 39A to set the sharpening ring
After moving the 38A horizontally and separating it from the grindstone,
Turn the dollar 34A in the cutting direction to cut the dressing ring 38A.
Turn the round handle 39A as evenly as possible
The setting ring 38A is horizontally moved to perform dressing. The grinding after the dressing of the upper grinding wheel 5A is completed.
The cut surface 5a is reduced by the cutting amount of the sharpening ring 38A and
Then, turn the round handle 48 to fix it to the lower surface of the front plate 42.
Guide block 43A for entrance of clothes and guide block for exit
The ground surface 5a rises at the lower surface position of the hook 43B (FIG. 1).
Just raise. Next, the lower grinding wheel 5B is also a lower dressing unit.
Almost the same as above with the setting ring 38B at the tip of 35B
After sharpening by the method, turn the round handle 18
Lower grinding wheel shaft head 3B by the amount reduced by sharpening of the side grinding wheel
Raise the body and make the ground surface 5a and the upper surface of the fixed plate 60 the same height.
Adjust it. In addition, the dressing ring 38A, 3 at the time of dressing
8B cut moves whetstones 5A and 5B directly down or up.
You may. [0047] The present invention is configured as described above.
Has the following effects. Work guidance circle by NC
Control of plate rotation and movement positioning control of the grinding wheel spindle head in the Z-axis direction
Control and automatic measurement of the grinding process
With a work supply device and a work discharge device.
Automatic supply and discharge of coil springs
Continuous cycle with each process separated from the next as one cycle
Automatic coil grinding machine at both ends
To improve efficiency and reduce labor costs through unmanned operations.
It is effective for reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side sectional view of a coil spring double-end grinding machine of the present invention. FIG. 2 is a front view in which an upper part of a coil spring both-end grinding machine is omitted. FIG. 3 is a top view of the entire coil spring both-end grinding machine. FIG. 4 is an explanatory diagram of a coil spring supply unit. FIG. 5 is an explanatory diagram of a coil spring discharge diagram. FIG. 6 is a flowchart for explaining the operation of a both-end grinding machine of a coil spring. FIG. 7 is a flowchart for explaining the operation of the both ends grinding machine of the coil spring. FIG. 8 is a side view of a conventional double-ended grinding machine for grinding both ends of a coil spring. FIG. 9 is an explanatory view showing a grindstone and a work part in a conventional double-sided grinding method in which a work inserted into a through hole of a work guide disk is passed between inclined grindstones; [Description of Signs] 1 Frame 3A Upper grinding wheel shaft head 3B Lower grinding wheel shaft head 4A Upper grinding wheel shaft 4B Lower grinding wheel shaft 5A Upper grinding wheel 5B Lower grinding wheel 8A Upper grinding wheel motor 8B Lower grinding wheel motor 11 Ball screws 13, 17 Deceleration Device 14 Z-axis servo sweater 15, 33A, 33B, 44 Feed screw 18, 34A, 34B, 39A, 39B, 48 Round handle 20 Loading frame 21 Disk drive shaft 23 Work guide disk 23a Work holding hole 25 C-axis motors 31A, 31B, 31C Guide bars 32A, 32B Vertical moving tables 35A, 35B Dressing units 38A, 38B Dressing ring 41 Guide bar 42 Front plate 43A Inlet guide block 43B Outlet guide block 53 Length measuring device body 54 Contactor 60 Fixing plate 63 Supply nozzle 64 , 65, 69 Air cylinder 66 Gate 67 Over click discharging closing plate 72 work ejector pin

Continuation of the front page (56) References JP-A-51-142174 (JP, A) JP-A-59-129665 (JP, A) JP-A-6-53195 (JP, A) JP-A-6-75619 (JP) JP-A-9-123044 (JP, A) JP-A-5-146949 (JP, A) JP-A-64-58467 (JP, A) JP-B-49-5879 (JP, B1) (58) Field surveyed (Int.Cl. ⁷ , DB name) B24B 7/17 B23Q 15/02 B24B 7/04 B24B 7/16 B24B 49/16 B24B 49/04

Claims (1)

(1) A pair of cup-shaped grindstones are provided at opposing ends of a pair of grindstone shafts rotatable opposite each other, at least one of which is capable of cutting and moving in the axial direction of the grindstone. One wheel head and front
First driving means for moving the grindstone shaft head capable of performing the notch movement in the grindstone axis direction, and rotating the pair of grindstone shafts respectively
A second driving means and an axis parallel to the grinding wheel axis such that a part of the work holding holes formed in the outer peripheral portion of the disk at equal intervals and in a plurality of rows extends between opposed grinding surfaces of the grinding wheel. a rotatably workpiece guide disc which is provided, and the workpiece supplying means for supplying a third driving means, the workpiece guide disc grinding machining previous workpiece in the workpiece holding holes of rotating the workpiece guide disc, said work holding Discharging means for discharging the workpiece in the hole after grinding, and a grinding wheel coming out of the grinding position during grinding
Measured Labs the length of the workpiece take not away in
When the preset upper value is reached by cutting , the upper signal is
Reach a preset lower value by spark-out grinding
Length measuring means to output the lower signal and cutting during grinding
By measuring the current value of the wheel spindle motor side wheel spindle preset
The upper limit signal is output when the upper limit is reached, and the preset lower limit
Load detecting means for outputting a lower limit signal when the current value decreases to a value , and the first driving means, the second driving means, and the third driving means based on output signals from the load detecting means and the length measuring means.
And means for controlling the means, to the workpiece holding holes
The work is supplied by the work supply means to all
The <br/> current value stops cut himself with the upper limit signal of the current value of the wheel spindle motor cuts the cut side wheel spindle with the pair of wheel spindle and said workpiece guiding disc Waru continuously rotated start the cut only at the lower limit signal intermittent cutting feed of the wheel spindle head
At the same time, the length of the length measuring means that is always measuring the length
Wherein in the lower position signal during spark-out enters the upper position signal intermittently stops cutting feed of the wheel spindle head with spur <br/> checkout
It concludes Ken <br/> cutting machining of all of the work that has been supplied to the workpiece holding holes, and discharge of the workpiece to the workpiece guide disc in accordance with the spacing of the workpiece holding hole by rotating step
And supply of work before grinding from the work supply means
A coil spring double-end grinding machine characterized in that it is configured to perform automatic attachment / detachment.