JPH047886Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a surface grinding machine that simultaneously grinds both sides of a workpiece using a grindstone, and is mainly supplied with a connecting rod as the workpiece.

(Prior art and its problems) With the recent rationalization of production systems, batch production systems have become popular, but even in surface grinding machines such as connecting rods, connecting rods with different width dimensions are conveyed in a mixed manner. There is a growing demand for sequential grinding.

However, with this type of conventional grinding machine, each time the type of conrod being supplied, that is, the width dimension, changes, the machine must be temporarily stopped, and the main shaft of the grinding wheel must be moved back and forth manually to adjust its position to the width of the new conrod. At the same time, the position of the side guides on both sides of the carrier disc is manually moved forward and backward to correspond to the width of the new connecting rod. Manually adjusting the positions of the side guide and the grindstone in this way takes a lot of effort. The so-called setup change work is time consuming,
There is a problem that it cannot compete with the aforementioned streamlined production system.

(Means for Solving the Problems) A rotatable carrier disk provided with a pair of grinding wheels facing each other, a plurality of pocket holes for holding workpieces penetrating in the axial direction, and a a carrier drive device for passing between the grinding wheels;
A loading device that loads the workpiece transported from the previous process into the pocket hole of the carrier disk, and side guides that are placed on both sides of the carrier disk and guide both sides of the workpiece to prevent the workpiece in the pocket hole from falling out. In the surface grinding machine, the loading device is equipped with a measuring device that measures the thickness of the workpiece and sends out the measurement result as a signal, and one of the pair of grinding wheels and one of the pair of side guides is equipped with a measuring device that measures the thickness of the workpiece and sends out the measurement result as a signal.
Actuators for moving them forward and backward relative to the workpiece are connected to each other, and the other of the pair of grinding wheels and one
The other of the pair of side guides is used as a reference surface, and includes a determining means for determining the type of workpiece based on a signal from the measuring device, and a control means for sending a position adjustment signal to each of the actuators based on the determining means for determining the type of workpiece by the determining means. A signal processing device is provided.

(Function) A measuring device measures the shape of the workpiece (i.e., connecting rod) that is conveyed from the previous process to the loading device, for example the thickness between the surfaces to be ground, and sends the result as a signal to the signal processing device. The type of workpiece is determined and the actuator is driven by a position adjustment signal from the processing device to continuously grind different types of workpieces.

(Example) Figures 1 to 3 show an example in which the present invention is applied to a double-headed surface grinder for a cooking rod.
It is equipped with a rotatable carrier disk 2, a pair of rotary grindstones 3, etc. Each grindstone 3 is operatively connected to a main shaft drive motor 7 via a main shaft 5 and a belt transmission mechanism 6, respectively. The carrier disk 2 is arranged vertically, and the carrier disk drive device 23 drives the horizontal axis O.
rotate around.

In FIG. 1, which shows a right side view, a plurality of workpiece holding pocket holes 10 are formed in the carrier disk 2 at intervals in the circumferential direction. In the upper half of the carrier disk 2, arc-shaped inlet side guides 13a, 13b are arranged on both left and right sides, and in the lower half of the carrier disk 2, arc-shaped outlet side guides 14a, 14b are arranged on both left and right sides. Further, a work discharge chute 16 is provided at the end of the outlet side guides 14a, 14b on the side of the carrier disk rotation direction R. The right grindstone head 48 is provided with a cutting servo motor 61 for automatically adjusting the position of the grindstone main shaft 5, and is connected to the signal processing device C. 18 is an automatic sizing device that measures the width of the workpiece after grinding, sends a command to a separately installed automatic sizing actuator, and performs an automatic sizing operation.

In FIG. 2 showing a front view, a measuring device 17 for measuring the thickness of a workpiece is provided at the right end of the loading device 1, and the measuring device 17 is connected to a signal processing device C.
a, 13b are supported by an entrance guide support device 20 so that the distance between the guides can be changed, and the lower exit side guides 14a, 14b are supported by an exit guide support device 21 so that the distance between the guides can be changed. The right side guides 13b and 14b are provided with pulse motors 87 and 1 for driving them forward and backward relative to the workpiece.
07 are interlocked and connected, and the pulse motors 87, 107
is connected to signal processing device C.

In FIG. 4 showing an enlarged longitudinal section of the loading device 1, the loading device 1 is equipped with the aforementioned measuring device 17, as well as a loading chute 25, a workpiece pushing piece 27, a workpiece supporter 30, and the like.

The loading chute 25 is fixed to the upper part of the loading body 24, and the carrier disc 25
It slopes downward as you go to the side.
A work stopper 28 is arranged at the tip of the loading chute 25 and moves back and forth in a substantially perpendicular direction. The stopper 28 has the function of stopping the workpiece at a predetermined timing at the position W1 by using an air cylinder 29 that expands and contracts in response to an output signal from the signal processing device, and feeds out the workpieces one by one.

The measuring device 17 measures the thickness between the surfaces to be ground of the workpiece (conrod), and is located to the left of the stopper 28, and is a position detector that includes a workpiece probe 36 and a pulse encoder 37. A cylinder 38 is provided. Measuring head 3
6 is the rod 3 of the cylinder 38 with the position detector.
It is fixed to the lower end of the loading chute 8a and is movable in a direction perpendicular to the loading chute 25. The cylinder 38 with position detector is the loading chute 2
It is fixed to 5. The above pulse encoder 37
has a function of measuring the length of cylinder extension when the probe 36 is pressed against the grinding surface of the work W1, converting it into a pulse, and outputting the measurement result to the signal processing device C.

Work supporter 30 is loading shoot 2
5, is fixed to the rotating arm 32, and includes a workpiece extrusion piece 27 and a workpiece extrusion air cylinder 26. Rotating arm 3
2 is rotatably supported by the loading body 24 via a horizontal rotation shaft 40, and its lower end is pivotally connected to a workpiece position conversion cylinder 33, and the cylinder 33 expands and contracts as shown by the imaginary line. The position can be changed freely between the workpiece receiving position and the workpiece supplying position shown by the solid line. In the workpiece receiving position, the workpiece support 30 is located in substantially the same extension plane as the loading chute 25, and in the workpiece supplying position, the workpiece support 30 is adjacent to the pocket hole 10 of the carrier disk 2. The position conversion cylinder 33 is linked to the stopper air cylinder 29, and when the stopper 28 retreats upward and the workpiece slides into the support 30 like W2,
The position conversion cylinder 33 is compressed and the support 30
from the receiving position to the supplying position. The workpiece pushing air cylinder 26 is extended when the support 30 comes to the supply position, and the pushing piece 27 pushes the workpiece W3 into the pocket hole 10.

FIG. 5 shows an enlarged vertical cross-sectional view of the right-hand grindstone 3, the grindstone main shaft 5, etc. The grindstone 3 is fixed to the tip of the main shaft 5, and the main shaft 5 rotates within a grindstone holder 45 via a bearing 46. freely supported. The main shaft 5 is locked in the axial direction with respect to the grindstone holder 45, that is, it is movable in the axial direction integrally with the grindstone holder 45, and the other end of the main shaft 5 is spline-connected to the pulley 47 of the transmission mechanism 6. There is. The grinding wheel holder 45 is supported by the grinding wheel head 48 so as to be movable in the left and right direction (in the longitudinal direction of the main shaft) but not rotatable, and a ball screw nut 52 is fixed to the lower surface via a nut holder 51. It is screwed into 53. That is, by the rotation of the ball screw 53, the grinding wheel holder 45 is moved by the screw feeding action.
can be moved in the left and right direction together with the main shaft 5.

The ball screw 53 is rotatably supported by the grindstone head 48 and is integrally provided with a cutting worm gear 56, which is engaged with a worm shaft 58. A pulse encoder 60 that detects the amount of rotation of the ball screw 53 is arranged opposite to the other end surface of the ball screw 53.

In FIG. 6, which shows a cross-section taken from FIG.
The aforementioned grindstone holder cutting servo motor 61 is connected to one end, and the cutting manual handle 6 is connected to the other end.
4 are connected. Further, the whetstone holder 45 is slidably mounted on a holder slide portion 66 of the whetstone head 48.

FIG. 7 shows an enlarged vertical cross-sectional view of the entrance guide support device 20, and in this FIG.
Guide holder bar 71,81 through 0,80
The guide holder bars 71, 81 are arranged parallel to each other and perpendicular to the carrier disk 2, extend to the left, and are supported by the guide support body 72 so as to be movable in the axial direction. Both inlet side guides 13a, 13b are non-rotatably locked by engagement of axial keys 73, 83 with grooves, respectively, and feed screws 75, 85 are screwed together.
The feed screws 75, 85 are rotatably supported by a guide support body (apparatus body) 72.

Since the left side entrance side guide 13a is used as a reference surface, a manual left side adjustment handle 76 is fixed to the corresponding feed screw 75.
By manually rotating the handle 76, the left entrance side guide 13a is adjusted to an accurate reference position.

On the other hand, since the movement of the right side guide 13b is automatically adjusted according to the present invention, a pulse encoder drive pulley 86 is fixed to the tip of the corresponding feed screw 85, and an inlet pulse motor 87 is interlocked and connected. ing. The pulse encoder drive pulley 86 is operatively connected to an inlet pulse encoder 88 shown in FIG.

FIG. 8 shows an enlarged vertical cross-sectional view of the outlet guide support device 21, and in this FIG.
Guide holder bar 91,1 through 0,100
01, both guide holder bars 91,1
01 are arranged parallel to each other and at right angles to the carrier disc 2, the right guy holder bar 14b extends to the right and the left guy holder bar 14a extends to the left, and is supported by the machine body 19 so as to be freely movable in the axial direction. ing. Both exit side guides 14a, 14
b are non-rotatably locked by keys 93 and 103, respectively, and screwed into feed screws 95 and 105, which are rotatably supported by the machine body 19.

Since the left exit side guide 14a is used as a reference surface, a manual left adjustment handle 96 is fixed to the corresponding feed screw 95.
By manually rotating the handle 96, the left exit side guide 14a is adjusted to an accurate reference position.

On the other hand, since the movement of the right side guide 14b is automatically adjusted according to the present invention, a pulse encoder driving pulley 106 is fixed to the tip of the corresponding feed screw 105, and an exit pulse motor 107 is interlocked with the leading end of the feed screw 105. ing. The pulse encoder drive pulley 76 is operatively connected to the exit pulse encoder 108 shown in FIG.

A signal processing device that controls the positions of the grindstone 3 in FIG. 5, the right entrance side guide 13b in FIG. 7, and the right exit side guide 14b in FIG. 8 based on the pulse signal from the measuring device 17 in FIG. 4. C includes a detection circuit 110 and a discrimination circuit 1 as shown in FIG.
11, an arithmetic circuit 112, a position register 113, and a control circuit 114 are built-in. Detection circuit 110
has a function of detecting the thickness of the workpiece, and the discrimination circuit 111 has a function of discriminating the type of workpiece based on the thickness of the workpiece, and determining the grinding wheel position and side guide position suitable for the workpiece based on the discrimination result of the workpiece type. have. The position register 113 is connected to each of the pulse encoders 60, 88, and 108, and has a function of detecting the current forward/backward position of the grinding wheel main shaft 5 and the positions of both right side guides 13b, 14b, and inputting the detected information to the arithmetic circuit 112. ing. The calculation circuit 112 has a function of comparing the grindstone position and side guide position suitable for the work from the discrimination circuit 111 with the current position from the position register and calculating the difference. The control circuit 114 is the arithmetic circuit 112
The result is sent as an output signal to each actuator, that is, the cutting servo motor 61 and the pulse motors 87, 107, to operate them.

Next, the operation will be explained. In FIG. 4, a workpiece sent from a previous process such as rough cutting is placed on the starting end of a loading chute 25, slides on the loading chute 25, and is temporarily stopped at a position W1 by a stopper 28.

In this state, the workpiece probe 36 descends and presses against the surface of the workpiece to measure the thickness of the workpiece. If this measurement is the same as the previously measured workpiece, the stopper 28 is retracted upwards and the workpiece slides into the support 30 in the receiving position, as indicated by position W2.

Next, the rod 33a of the position changing cylinder 33 is retracted to rotate the support 30 to the supply position, and then the workpiece pushing air cylinder 26 is extended to push the workpiece into the pocket hole 10.

As the carrier disk 2 rotates, the workpiece first passes between the inlet side guides 13a and 13b, and then passes between the two grindstones 3 shown in FIG. 3, and both surfaces of the workpiece are ground during the passage. The workpiece after grinding passes between the outlet side guides 14a and 14b shown in FIG. 8, and is discharged from the discharge chute 16 shown in FIG.

Grinding of one lot of one type of workpiece is completed,
Subsequently, when another type of workpiece with a different thickness begins to be supplied to the loading device 1, the grindstone position and side guide position are automatically adjusted as follows.

That is, when the first workpiece of a new type is placed on the loading chute 25 in FIG.
A pulse signal is sent to processing device C from 7.

The processing device C shown in FIG. 9 determines the type of workpiece, determines the grindstone position and side guide position suitable for the workpiece, and calculates the difference from the current situation.
After confirming that all the workpieces of the previous rod have been ejected from the carrier disk 2 using an appropriate confirmation device, the servo motor 61 of the grinding wheel main shaft 5 shown in FIG.
and each pulse motor 87 for moving the side guide,
107, each of the above motors 61, 8
7 and 107 by a predetermined amount to move the right grindstone position and the right side guide position to positions suitable for the shape of the new workpiece.

For example, if a new type of workpiece is thinner than the previous type of workpiece, the servo motor 61 in FIG.
For example, by forward rotation, the main shaft 5 and the grinding wheel 3 are moved to the carrier disc 2 side via the worm shaft 58, the worm gear 56, the ball screw 53 shown in FIG. 5, the ball screw nut 52, and the grinding wheel holder 45, and both grinding wheels
Reduce the spacing between. On the other hand, if the workpiece is thicker than the previous type of workpiece, the servo motor 61
is reversed to move the main spindle 5 and the grinding wheel 3 away from the carrier disk 2. Regarding the right side guides 13b and 14b in FIGS. 7 and 8, if the workpiece is thinner than the previous type of workpiece, for example, by forward rotation of each pulse motor 87, 107, each right side guide 13b, 14b, 14b as carrier disk 2
move it to the side and narrow the side guide interval. On the other hand, if the workpiece is thicker than the previous type of workpiece, the pulse motors 87, 107 are reversed to move the respective right-hand side guides 13b, 14b away from the carrier disk 2.

After the side guide spacing and grindstone spacing are automatically adjusted to the appropriate position for the new workpiece as described above,
The stopper 28 in FIG. 4 rises and pushes the workpiece into the support 30.

The automatic sizing device 18 shown in FIG. 1 measures the finished dimensions of the workpiece, sends a command to the automatic sizing actuator, adjusts the movement of the main shaft 5, and corrects errors in the dimensions of the ground surface due to grindstone wear.

(Effects of the Invention) As explained above, the present invention uses the measuring device 17 to measure the shapes and dimensions of different types of workpieces that are conveyed in a mixed manner, and inputs the measurement signal from the measuring device 17 to the signal processing device C. The type of workpiece is determined based on the workpiece type, and the grinding wheel spindle position and side guide interval can be automatically controlled to the position and interval suitable for the new workpiece based on the workpiece type determination result, so the following advantages are achieved. be.

(1) Even when lots of different types of workpieces are continuously sent from the previous process, the grinding wheel position and side guide spacing can be automatically changed to suit each type of workpiece. Compared to changing settings, the hassle of setup changes can be saved and the production system can be further streamlined.

(2) 1 pair of grinding wheels 3, 1 pair of entrance side side guides 1
3a, 13b and a pair of exit side side guides 1
4a, 14b, one of the grinding wheels 3 and side guides 13b, 14b is movably controlled by the processing device, and the other is used as a reference surface, which is simpler and more compact than the case where both are controlled. structure.

[Brief explanation of the drawing]

Figure 1 is a right side view (view from the arrow in Figure 2) of a surface grinder to which the present invention is applied, Figure 2 is a front view, and Figure 3 is a front view.
The figure is a plan view, Figure 4 is an enlarged vertical cross-sectional view of the loading device, Figure 5 is an enlarged vertical cross-sectional view of the grindstone and main shaft, Figure 6 is a cross-sectional view of Figure 5, and Figure 7 is an inlet side guide. 8 is an enlarged longitudinal sectional view of the exit side guide, and FIG. 9 is a block diagram of the signal transmission system. 1... Loading device, 2... Carrier disk, 3... Grinding wheel, 10...
Pocket hole, 13a, 13b...Entrance side guide, 14a, 14b...Exit side guide, 17
...Measuring device, 23...Carrier disk drive device,
61... Cutting servo motor (actuator for grinding wheel), 87, 107... Pulse motor (actuator for side guide).

Claims (1)

[Scope of utility model registration request] a rotatable carrier disk having a pair of grindstones facing each other, a plurality of pocket holes for holding workpieces penetrating in the axial direction, and a carrier drive device that rotates the carrier disk and passes between the grindstones. ,
A loading device that loads the workpiece transported from the previous process into the pocket hole of the carrier disk, and side guides that are placed on both sides of the carrier disk and guide both sides of the workpiece to prevent the workpiece in the pocket hole from falling out. In the surface grinding machine, the loading device is equipped with a measuring device that measures the thickness of the workpiece and sends out the measurement result as a signal, and one of the pair of grinding wheels and one of the pair of side guides is equipped with a measuring device that measures the thickness of the workpiece and sends out the measurement result as a signal.
Actuators for moving them forward and backward relative to the workpiece are connected to each other, and the other of the pair of grinding wheels and one
The other of the pair of side guides is used as a reference surface, and includes a determining means for determining the type of workpiece based on a signal from the measuring device, and a control means for sending a position adjustment signal to each of the actuators based on the result of determining the type of workpiece by the determining means. A surface grinding machine characterized by being equipped with a signal processing device.