JPH0150787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a moving mechanism that allows a pair of moving bodies to move synchronously and separately.

(Prior art) It is possible to re-melt the cam lift part of a camshaft using a plasma arc, etc., and then rapidly cool the re-melted part to chill it, thereby increasing the hardness of the surface of the cam lift part and improving its wear resistance. Are known.

Conventionally, when performing such remelting hardening treatment on a member to be treated such as a camshaft, one plasma torch is used to remelt the member to be treated.

(Problems to be Solved by the Invention) By the way, in the case of a camshaft, for example, as a member to be treated, there are a plurality of camshaft parts to be subjected to remelting and hardening treatment, and as described above, it is difficult to use a single plasma torch. The remelting and hardening treatment has the disadvantage that the treatment takes time.

Therefore, for example, it is conceivable to arrange two plasma torches in parallel to treat two camshaft portions at the same time.

However, even with this method, it is not possible to deal with cases where the intervals between the cam lift portions of the camshaft are not constant, so there is an inconvenience that processing efficiency cannot be improved.

(Means for Solving the Problem) In order to solve the above problem, the present invention provides a moving mechanism including a first and a second moving body, and a first motor for the first and second moving bodies. A ball screw that rotates with the ball passes through the ball screw, and first and second ball nuts are screwed into the ball screw, and the first ball nut is connected to the first ball nut.
The second ball nut is fixed to the moving body of the second ball nut.
The rotating body is fixed to a rotating body rotatably attached to the moving body, and this rotating body is rotated by a second motor.

(Function) By driving the first motor, the first and second
The moving bodies move synchronously, and the second moving bodies move individually by driving the second motor.

(Example) Examples of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a side view of a remelting and hardening processing apparatus equipped with a moving mechanism according to the present invention, and FIG. 2 is a front view of the same apparatus. The remelting and hardening treatment apparatus 1 has a frame 2 erected on the floor, a support box 3 housing a power source etc. is fixed to the frame 2, a control box 4 is installed behind the support box, and a cooling device 5 is installed above the support box.
Further, plasma power supply boxes 6, 6 are arranged on the left and right sides of this cooling device 5.

The remelting and hardening processing apparatus 1 also includes a loading and unloading station S1 for loading and unloading the workpiece W such as a camshaft, a preheating station _S2 for preheating the workpiece W, and a remelting station _S1 for remelting the workpiece W. A rotating shaft 7 is provided at an intermediate position between each of these stations S ₁ , S ₂ , and S _{3 .}
are placed. The rotary shaft 7 is rotated via a motor 8 fixed to the support box 3 and a speed reduction mechanism, and the amount of rotation is intermittently rotated by, for example, 120 degrees in response to a signal from the control box 4.

A case 9 having a substantially hexagonal shape when viewed from the side is provided at the center of the rotating shaft 7, and three arms 10 project outward from the case 9. These arms 10 are attached at a distance of 120 degrees from each other, and a clamp mechanism 11 is provided at the tip of each arm 10.

As shown in FIG.
a, 10a, and these left and right members 10
The intermediate parts of fingers 14, 15 are pivotally connected to the tips of fingers 14, 10a, and the rear ends of these fingers 14, 15 are connected to the rod 13 through links 16, 16.
By operating the cylinder unit 12 and causing the rod 13 to make a protruding movement, the fingers 14 and 15 are opened, the gripping state of the workpiece W is released, and the rod 13 is made to make a retracting movement. The fingers 14 and 15 are closed to grip the workpiece W. The tip of one finger 15 is a bifurcated portion 15 facing the workpiece W.
a, even if the fingers 14 and 15 are slightly opened, the workpiece W to be processed does not fall and is held rotatably between the bifurcated portion 15a and the finger 14, and when the fingers 14 and 15 are closed. is 3
The workpiece W to be processed is clamped at a point so that the center of the workpiece W is always kept constant. and,
By rotating the rotating shaft 7, the clamp mechanism 11
The rotational locus is arranged to approximately pass through each of the stations S ₁ , S ₂ , and S ₃ .

Further, a rail member 17 is fixed to the front surface of the upper horizontal frame 2a of the frame 2, and this rail member 1
7 is engaged with the traveling head 18. A motor 19 is attached to the traveling head 18, and this motor 1
9 causes the running head 18 to move laterally along the rail member 17 via the rack and pinion mechanism.

The traveling head 18 is provided with a loading member 20 for transporting unprocessed workpieces W to the loading/discharging station _S1 , and a discharging member 21 for discharging processed workpieces W from the loading/discharging station _S1 . The loading member 20 consists of a cylinder unit 22 fixed to the traveling head 18 and a clamp mechanism 23 provided at the rod end of the cylinder unit 22. When the cylinder unit 22 is operated, the clamp mechanism 23 moves to the loading/discharging station S. ₁
and a position above and in front of this station _S1 . Further, the dispensing member 21 is the input member 2.
0, the cylinder unit 24 is fixed to the traveling head 18, and the clamp mechanism 25 is provided at the end of the rod of this cylinder unit 24. When the cylinder unit 24 is operated, the clamp mechanism 25 is connected to the loading/discharging station _S1 . It moves up and down between the station _S1 and the position directly above it.

Further, a delivery member 26 is provided below the input/discharge station _S1 . This transfer member 26 has an intermediate portion of an arm 26a swingably attached to a flange portion 27 protruding forward from the front surface of the support box 3, and the lower end of the arm 26a is connected to a rod of a cylinder unit 28 fixed to the support box 3. However, the actuation of the cylinder unit 28 causes the ground 26a to swing back and forth (left and right in FIG. 1) centering on the intermediate portion. As shown in FIG. 5, which is a view taken in the Z direction of FIG. 1, a chuck mechanism 29, which is a holding mechanism, is provided at the upper end of the arm 26a. This chuck mechanism 29
consists of a cylinder unit 29a and a center 29b attached to the cylinder unit 29a, and the left and right centers 29b hold both ends of the workpiece W by causing the cylinder unit 29a to move forward. When the arm 26a swings due to the operation of the cylinder unit 28, the chuck mechanism 29 moves between the rotation locus of the clamp mechanism 11 provided at the tip of the arm 10 and the clamp mechanisms 23 and 2 at the lower ends of the input member 20 and the dispensing member 21.
I am trying to move between 5 and 5.

Furthermore, in the preheating station _S2 , as shown in FIG.
0,30 are arranged, and these cylinder units 30
An energization heating device 32 as a preheating device is attached to the tip of the rod 31.

Furthermore, the heating station _S3 is provided with a heating device 61 equipped with the moving mechanism of the present invention. A heating device 61 is attached to the support box 3 by a column 6.
2 is erected, and a pair of support plates 63, 63 spaced apart laterally is attached to this support column 62, and these support plates 6
As shown in FIG.
is installed.

A pair of first moving tables 68 and a second moving table 69 are provided inside the case 67, and these moving tables 6
A plasma torch 70 connected to the plasma power source 6 is attached to the lower ends of the plasma generators 8 and 69. The movable tables 68 and 69 also include a guide rod 71 as a guide member installed laterally within the case 67.
71 passes through the guide rod 71, and movable bases 68 and 69 as movable bodies can slide along the guide rod 71 via a linear slide bearing 72.

Further, a ball screw 73 and a spline rod 74 commonly pass through the movable tables 68 and 69, and these ball screws 73 and spline rods 74 are rotatably supported by the case 67.
One end of the spline rod 74 is connected to the drive shaft 64a of the first motor 64, and one end of the spline rod 74 is connected to the drive shaft 64a of the first motor 64.
The drive shaft 65a of the motor 65 is connected to the drive shaft 65a of the motor 65. The first ball nut 7 is attached to the ball screw 73.
5 and a second ball nut 76 are screwed together, the first ball nut 75 is fixed to the first moving table 68, and the second ball nut 76 is fixed to an inner sleeve 77 which is a rotating body. This inner sleeve 77 is rotatably fitted onto the ball screw 73 and is also rotatable through a bearing 79 with respect to an outer sleeve 78 fixed to the second moving table 69 . axial movement is restricted.

Furthermore, a gear 80 is provided at one end of the inner sleeve 77.
is fixed, and this gear 80 is meshed with a gear 81 fitted to the spline rod 74. In addition, 82 in Fig. 4 is a dust seal, 8
3 is a stopper.

In the above, when the first motor 64 is driven, the ball screw 73 rotates, and this ball screw 7
3 rotates, the first ball nut 75 and the second
ball nut 76 tries to rotate. However, the first ball nut 75 is fixed to the first moving table 68, and the second ball nut 76 is fixed to the inner sleeve 77, and a gear 80 is fitted into the inner sleeve 77. motor 65 (not running at the moment)
Since the first ball nut 75 and the second ball nut 76 are meshed with a gear 81 fitted to a spline rod 74 connected to the ball nut 74, both the first ball nut 75 and the second ball nut 76 do not rotate, but instead spiral along the ball screw 73. As a result, the first moving table 68 and the second moving table 69 move synchronously.

Furthermore, when the second motor 65 is driven, the spline rod 74 rotates.
4, the gears 81 and 80 rotate, and the rotation of the gear 80 causes the inner sleeve 77 and the second ball nut 76 to rotate. However, ball screw 73
does not rotate, the second ball nut 76 rotates and spirals along the ball screw 73, and as a result, only the second movable base 69 moves leftward or rightward.

In this way, the first and second movable tables 68, 69
Since the plasma torches 70 and 70 can be moved synchronously, the plasma torches 70 and 70 will not interfere with each other, and since only the second moving stage 69 can be moved individually, for example, the cam lift part of the camshaft can be moved simultaneously. When performing the remelting treatment at two locations, the remelting treatment can be performed efficiently even if the intervals between the cam lift portions are different in one camshaft.

Incidentally, an alloy powder supply unit 84 is mounted on the pillar 62.
is arranged so that the high hardness alloy powder from this unit 84 is supplied into the plasma arc.

Further, a laser position detection device 85 is arranged behind the plasma torch 70, and this position detection device 85
detects the end face of the cam portion of the camshaft, which is the workpiece W to be processed, and moves the plasma torch 70 in the axial direction using a signal from the position detection device 85 so that the arc from the plasma torch 70 is accurately positioned on the cam portion. I try to let them do it.

Further, chuck devices 86, 86 are disposed on both sides of the heating station _S3 below the plasma torch 70, and these chuck devices 86, 86 hold both ends of the workpiece W to be processed, and also a motor 87 and a deceleration mechanism. By rotating the chuck device 86 via the chuck device 86, the workpiece W to be processed is rotated around the axis.

Next, the operation of the remelting and hardening processing apparatus 1 configured as described above will be described below. In the description, a state in which the clamp device 11 at the tip of each arm 10 does not grip the workpiece W will be explained as a starting point.

First, by driving the motor 19, the traveling head 18 is moved in the direction perpendicular to the plane of the paper in FIG. The processing member W is grasped approximately at the center, and the motor 19 is driven again to move the traveling head 18 to the center of the apparatus 1.

Next, the cylinder unit 22 of the input member 20
is activated to lower the clamp mechanism 23 diagonally downward, and both ends of the workpiece W held by the clamp mechanism 23 are held by the chuck mechanism 29 of the delivery member 26.

Then, the cylinder unit 28 is activated and the arm 26a of the transfer member 26 swings clockwise in FIG.
The workpiece W to be processed, which is held at , overlaps the rotation locus of the clamp mechanism 11 provided at the tip of the arm 10 .
Therefore, while gripping the workpiece W with the clamp mechanism 11 provided at the tip of the arm 10, the gripping state of the chuck mechanism 29 is released, and the arm 10
The workpiece W to be processed is delivered to the clamp mechanism 11 of.

Thereafter, the rotating shaft 7 is rotated 120 degrees counterclockwise in FIG. 1, and the workpiece W to be processed is positioned at the preheating station _S2 . Specifically, the rotating shaft 7 rotates 120 degrees,
When the clamp mechanism 11 reaches the lowest position, the rotation of the rotating shaft 7 is stopped, and both ends of the workpiece W are held by the holding members 35 of the energization heating device 32. Electricity is applied to the member W to be processed through the laminate 56, the piston body 34, and the conductive member 36, and the member W to be processed is
Preheat to about 200-450℃.

After the preheating is completed, the energization heating device 3
2 is released, and the rotating shaft 7
is again rotated 120 degrees counterclockwise in FIG. 1, and the workpiece W to be processed is positioned at the heating station _S3 .
Then, chuck devices 86, 86 disposed on both sides of the heating station _S3 hold both ends of the workpiece W to be processed. Once both ends are held, the grip by the clamp mechanism 11 is loosened.

Next, the plasma torches 70, 70 move up and down and left and right, so that the tips of the torches face the part of the workpiece W to be remelted. Specifically, when the workpiece W is a camshaft, the tips of the plasma torches 70, 70 are arranged to face one end of the cam lift.

Once the plasma torches 70, 70 are positioned at predetermined positions, the chuck device 86 is rotated by driving the motor 87, and the workpiece W to be processed is rotated around its axis by the rotation of the chuck device 86. A predetermined portion of the workpiece W is remelted by plasma arc from the torches 70, 70. Furthermore, the melting depth at this time is shallow;
Since only the surface portion is melted, after melting, heat is rapidly transferred to other portions than the fused portion, and the material is rapidly cooled and chilled by self-cooling, forming a portion with high hardness and excellent wear resistance.

Thereafter, the rotating shaft 7 is further rotated 120 degrees counterclockwise, and the processed workpiece W is positioned at the loading/discharging station _S1 . Then, the delivery member 26 swings clockwise, the chuck mechanism 29 of the delivery member 26 grips the processed workpiece W, and the gripping state by the clamp mechanism 11 is released, and the workpiece W is delivered. Part 2
Hand it over to 6. Next, the arm 26a of the transfer member 26 is swung counterclockwise by a predetermined angle by the operation of the cylinder unit 28, and the workpiece W to be processed is taken out of the rotation locus of the clamp mechanism 11.

When the workpiece W is taken out of the rotation locus of the clamp mechanism 11, the delivery member 21
The cylinder unit 24 is activated to lower the clamp mechanism 25 and grip the workpiece W at its lowered end. In addition, the dispensing member 21 and the inputting member 2
0 and 0 at the same time, so that they do not interfere with each other at the lower end.

In this way, the clamp mechanism 2 of the dispensing member 21
5 grips the processed workpiece W, the cylinder unit 24 is activated to pull the workpiece upward, and the motor 19 drives the entire traveling head 18 to move the workpiece to the next process, etc. The processed workpiece W is transported.

By repeating the above operations, the object to be treated is continuously remelted and hardened at the same location.

(Effects of the Invention) As described above, according to the present invention, a pair of movable bodies can be moved synchronously, so if applied to a moving mechanism of a plasma torch of a remelting hardening treatment device, it can be applied to a cam lift of a camshaft, for example. When remelting and hardening two parts at the same time, the remelting and hardening can be performed efficiently even if the intervals between the cam lift parts are different in one camshaft. Further, since one plasma torch can be moved relative to the other plasma torch, it is possible to easily deal with cases where the intervals between the cam parts are different.

[Brief explanation of drawings]

Fig. 1 is a side view of a remelting hardening processing device equipped with a moving mechanism according to the present invention, Fig. 2 is a front view of the same device, Fig. 3 is an enlarged view of the clamp mechanism, and Fig. 4 is a movement of the heating device. A sectional view showing the mechanism, FIG. 5 is a view taken in the Z direction of FIG. 1. In the drawing, 1 is a remelting and hardening treatment device, 3 is a support box, 7 is a rotating shaft, 10 is an arm, 11 and 2 are
3, 25 is a clamp mechanism, 20 is a charging member, 21
26 is a delivery member, 32 is a preheating device, 61 is a heating device, 64 is a first motor, 6
5 is a second motor, 68 is a first moving table, 69 is a second moving table, 70 is a plasma torch, 73 is a ball screw, 75 is a first ball nut, 76 is a second ball nut, 77 is an inner sleeve , 8
6 is a chuck device, _S1 is an input/discharge station, _S2 is a preheating station, _S3 is a heating station, and W is a member to be processed.

Claims (1)

[Claims] 1. In a moving mechanism including first and second moving bodies that move along a guide member, a ball screw rotated by a first motor passes through the first and second moving bodies, and the ball screw rotates by a first motor. A first and a second ball nut are screwed together, the first ball nut is fixed to the first moving body, and the second ball nut is fixed to a rotating body rotatably attached to the second moving body. A moving mechanism characterized in that the rotating body is rotated by a second motor.