JP2000052135A - Work inverting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To invert a work from a horizontal position to a vertical position in order to cut the work with a saw blade, etc., and to simplify the construction of a work inverting device capable of multiple angular motion for tilting the work in the direction parallel to a vertical plane. SOLUTION: A pair of spherical bearings 6, 7 is installed to both end parts of the undersurface of a jig 5 for holding a work 1 in a horizontal position, with their centers P, Q of rotation being offsetarranged in the horizontal- direction and in the vertical direction. Torque of the jig 5 is energized by a single actuator 9. The jig 5 is rotated through 90 degrees about the centers P, Q of rotation of the spherical bearings 6, 7, and the work 1 is tilted integrally with the jig 5 by a fixed angle even in the direction parallel to a vertical plane while it is inverted from a horizontal position to a vertical position. After inversion of the work, a horizontally driven saw blade 3 cuts the lowered work 1 from just above the work 1 tilted in a vertical position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work reversing device for reversing a work such as a cast article from a horizontal posture to a vertical posture in order to finish the work or the like, and further reversing the vertical posture to a horizontal posture or the like. About.

[0002]

2. Description of the Related Art FIG. 4 shows an example of equipment for a work finishing step for partially cutting and finishing a cast article. In the figure, a workpiece 1 of a cast article is a jig 2 of a pre-stage finishing equipment A by a transfer device between the equipments.
The workpiece 1 is transferred from a to the jig 2b of the workpiece cutting device B, and the workpiece 1 is cut as described later. The cut workpiece 1 is transferred from the jig 2b to the jig 2c of the finishing equipment C.

[0003] A workpiece 1 of a cast article is, for example, shown in FIG.
As shown in (B), the work body 1a of a rectangular block body
And a rectangular frame-shaped peripheral projection frame 1b protruding from a peripheral portion of the upper surface of the work body 1a, and a plurality of central projection groups 1c protruding in a horizontal line at the central portion of the upper surface of the work body 1a.
The work 1 is positioned and mounted on the jig 2b of the work cutting device B in a horizontal posture, and the peripheral protrusion frame 1b and the central protrusion group 1c are cut from the upper surface of the work body 1a. Such cutting requires the horizontal jig 2b holding the work 1 as shown by the solid line in FIG. 6 in order to minimize the space between the first-stage finishing equipment A and the second-stage finishing equipment C. 6 is performed in a state where the work 1 is held in a vertical posture as shown by a chain line in FIG. FIG.
Is a front view of the work 1 and the jig 2b in the inverted vertical posture, and the saw blade 3 that is driven horizontally is lowered from directly above the work 1 to move the peripheral protrusion frame 1b and the center protrusion group 1c from the work body 1a. Disconnect.

A work reversing device for reversing the work 1 from a horizontal posture to a vertical posture supports a part of the lower surface of a horizontal rectangular flat jig 2b with a bearing 4, and applies a rotational force to the jig 2b by an actuator (not shown). The jig 2b is rotated vertically by 90 ° about the bearing 4 as a fulcrum. When the cutting of the work 1 by the saw blade 3 is completed, the jig 2 b
Is rotated from the vertical position of the chain line in FIG. 6 to the original horizontal position of the solid line to prepare for the next work cutting.

[0005]

The work cutting apparatus B described above
In the simple work cutting apparatus B in which the feed speed of the saw blade 3 is constant, the cutting resistance when the saw blade 3 cuts the work 1 directly is the electric motor. May be exceeded. For example, FIGS. 7 and 8
The relationship between the cutting position of the saw blade 3 and the load current of the electric motor is shown and described below.

When the horizontal saw blade 3 descends to cut the work 1 in the vertical posture, first, the saw blade 3
The cutting is started by abutting the entire upper side in parallel, and thereafter, the central projection group 1c is sequentially cut from both sides of the peripheral projection frame 1b. At the cutting position La where the saw blade 3 cuts the upper side of the peripheral projection frame 1b and the cutting position Le where the lower side is cut, the cutting resistance becomes maximum and the load current Ia of the electric motor becomes maximum.
The cutting resistance is minimized at the cutting positions Lb and Ld where the saw blade 3 cuts only both sides of the peripheral projection frame 1b, and the load current Ib of the electric motor is minimized. At the cutting position Lc where the saw blade 3 cuts both sides of the peripheral projection frame 1b and the central projection group 1c, the cutting resistance has an intermediate value between the maximum value and the minimum value, and the load current Ic of the electric motor has an intermediate value.

When the cutting resistance when the load current of the electric motor for driving the saw blade 3 is maximized exceeds the capacity of the electric motor, the cutting of the work cannot be continued. As the solution, the following measures (1) to (3) can be mentioned.

(1) Replace the electric motor with another electric motor having a large output. (2) The cutting force is reduced by slowing down the feed of the saw blade during work cutting. (3) The angle of the work with respect to the saw blade is changed so that the cut portion of the work to be cut by the saw blade is inclined with respect to the saw blade, thereby reducing the cutting resistance.

However, in the case of the measure (1), the size of the electric motor having a large output is inevitably increased, and interference with peripheral devices may become a problem. Further, in the case of the measure (2), a problem that the work cycle time becomes long and the equipment cycle becomes slow may occur.

The countermeasure (3) is implemented by holding the work 1 via a rotary direction changing mechanism on the jig 2b in the work reversing device shown in FIG. Jig 2b during reversal from horizontal position to vertical position
The work 1 is rotated on a plane parallel to the above, and the work 1 is inclined with respect to the saw blade 3. However, in such measures, it is necessary to add a rotary work direction change mechanism to the work cutting device, and this is due to space constraints in the equipment and separate operation of tilting the work on the jig. Problems such as addition of various control systems (increase in capital investment).

The present invention has been made in view of the above problem (3), and is a work reversing device for reversing a work from a horizontal posture to a vertical posture inclined at a predetermined angle without complicating the mechanism. In particular, it is an object of the present invention to provide a work reversing device which can be effectively applied particularly to a work cutting device using a cutting tool.

[0012]

SUMMARY OF THE INVENTION According to the present invention, a jig holding a work carried on a substantially horizontal jig surface is rotated by approximately 90 ° in a vertical direction with bearings provided at both ends thereof as fulcrums. A work reversing device for reversing a substantially horizontal posture from a substantially vertical posture, wherein bearings installed at both ends of the jig rotate a substantially horizontal jig approximately 90 ° with the bearing as a fulcrum. Are spherical bearings that are offset in the horizontal and vertical directions so that they rotate at a constant angle in a direction parallel to the substantially vertical plane while rotating to a substantially vertical plane.

Further, the present invention is characterized in that the jig is provided with an actuator for urging a vertical reciprocating rotational force.

Further, the present invention is characterized in that the work held by the jig is reversed together with the jig from a horizontal posture to a substantially vertical posture, and the work is machined by a blade for horizontally driving the work. Is what you do.

Here, the work is a cast article or the like, and the work is positioned and mounted on a horizontal jig, and the jig is rotated approximately 90 ° in the vertical direction with the spherical bearings at both ends as fulcrums, thereby being substantially vertical. When the posture is reversed, the work together with the jig is also reversed from the horizontal posture to a substantially vertical posture, and at the same time, the work is tilted at a constant angle in a direction substantially parallel to the vertical plane. Therefore, when cutting a work in a vertical position from directly above with a cutting tool such as a saw blade that drives horizontally, the work is inclined with respect to the cutting tool, cutting resistance is reduced, and cutting of the work can be performed with a small output power motor. Practical effects such as becoming can be expected.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The work reversing device shown in the embodiment of the same figure is incorporated in the work cutting device B of FIG. 4, and moves the work 1 which is the cast article of FIG. 5 from a horizontal posture to a vertical posture, or vice versa. At the same time, the work 1 is automatically tilted in a predetermined direction when the work is reversed.

FIG. 1A is a plan view when the workpiece 1 is positioned and held on a horizontal rectangular flat jig 5 in a horizontal posture, and FIG. 1B is a front view of the jig 5. Yes, Figure 1
(C) is a left side view of the jig 5 of FIG. 1 (B). FIG.
The horizontal direction of the left and right of (A) and (B) is defined as the X direction, and FIG.
Assuming that the left and right horizontal directions of (C) are the Y direction, in the apparatus of the present invention, a pair of spherical bearings 6 and 7 are offset at both ends in the X direction on the lower surface of the jig 5 in the Y direction and the vertical Z direction. Then, the jig 5 is rotated back and forth by 90 ° between the horizontal position and the vertical position with the rotation centers P and Q of the spherical bearings 6 and 7 as fulcrums.

FIGS. 1B and 1C show the outline of the spherical bearings 6 and 7, respectively.
Spherical bearings 6 and 7 are installed between the two, and as shown by the chain line in FIG.
Two actuators 9 are installed. Actuator 9
A simple and inexpensive mechanism using a motor or a cylinder as a drive source may be used.

Rotation centers P and Q of a pair of spherical bearings 6 and 7
Are offset by a predetermined distance dy in the Y direction as shown in FIG. 2C, and are offset by a predetermined distance dz in the Z direction, which is the height direction. On a jig 5 horizontally held by a pair of spherical bearings 6 and 7 and an actuator 9, a rectangular block of work 1
Is positioned and placed in parallel with the four sides. In this state, when a rotational force from the Y direction to the Z direction is applied to the jig 5 by the actuator 9, the jig 5 rotates together with the work 1 from a horizontal posture to a vertical posture shown by a chain line in FIG. With this rotation, the jig 5 and the work 1 are inclined at a fixed angle in the X direction with respect to the vertical plane as shown by a chain line in FIG.

FIG. 2A shows a jig 5 and a work 1 in a horizontal posture.
2B is a front view of FIG. 2B in which the jig 5 is rotated by 90 degrees to the front, and a left side view of FIG.
(C). The rotation of the jig 5 causes the pair of spherical bearings 6,
The jig 5 is tilted by a fixed angle θ with respect to the horizontal X direction on the vertical plane by the rotation of the center 7 about the rotation centers P and Q that are offset. Further, the spherical bearings 6 and 7 are offsetly arranged so that the jig 5 is tilted at a constant angle θ while being inverted by 90 °. Note that the jig 5 cannot rotate if the pair of offset spherical bearings 6 and 7 is a bearing that rotates only in a normal uniaxial direction.

When the jig 5 is reversed from the horizontal posture to the vertical posture, the work 1 integrated with the jig 5 is also reversed from the horizontal posture to the vertical posture, and at the same time, is inclined at a constant angle θ with respect to the horizontal X direction. Accordingly, when the peripheral projection frame 1b and the central projection group 1c are cut from the work body 1a of the work 1 by the horizontally driven saw blade 3 arranged in the horizontal X direction, the saw blade 3 is moved to the peripheral projection frame 1b.
And the central projection group 1c at an inclination angle θ, so that cutting can be performed with a small cutting resistance.

FIG. 3 shows the cutting position of the workpiece 1 by the saw blade 3 divided into three positions. The first cutting position Lh is obtained by cutting the upper side of the peripheral projection frame 1b in which the saw blade 3 is inclined at an angle. Further, in a section where the cutting is performed to the upper end surface of the central projection group 1c, the cutting resistance in this section is small on average, and the load current of the electric motor which is the prime mover of the saw blade 3 is, for example, as shown by a chain line in FIG. The value is suppressed to about the value Ic or less. The second cutting position Li in FIG. 3 is a section where the saw blade 3 cuts the central projection group 1c, and the cutting resistance is maximum in this section, but the load current of the electric motor is reduced to about the intermediate value Ic in FIG. It is. The third cutting position Lj in FIG. 3 is a section from when the saw blade 3 cuts the central projection group 1c to when it cuts the lower side of the peripheral projection frame 1b, and has a cutting resistance opposite to the first cutting position Lh. As a result, the load current of the electric motor gradually decreases from the intermediate value Ic in FIG.

As described above, when the work 1 is cut by the saw blade 3, the work 1 is inclined at a constant angle θ with respect to the saw blade 3, so that the cutting resistance is reduced as a whole from the start to the end of cutting. Cutting without the need to increase the output of the electric motor. Also, when the jig 5 and the work 1 are turned over integrally,
Since the jig 5 and the work 1 are tilted with respect to the saw blade 3 while being integrated, a work direction changing mechanism for rotating and tilting the work 1 with respect to the jig 5 needs to be attached to the jig 5. Therefore, the jig peripheral mechanism can be simplified. Further, the combined angular movement (two-way movement) of the inversion and the tilting of the jig 5 and the work 1 can be performed by the single actuator 9. As this single actuator 9, a simple and inexpensive actuator that simply applies a rotational force to the jig 5 can be applied, and the structure and cost of a work reversing device having a complex angular motion function can be simplified. Is achieved.

The present invention is not limited to a cast workpiece or a workpiece reversing device applied to a workpiece cutting device.

[0025]

According to the present invention, the jig and the work are tilted while reversing from a substantially horizontal posture to a substantially vertical posture with a spherical bearing offset from the jig holding the work as a fulcrum. This makes it possible to simplify the structure, save space, and reduce the cost of a work reversing device capable of performing a combined angular movement of reversing and tilting a work.

Further, the work reversing device can be further simplified by applying a rotational force to the jig by a single actuator to perform the work reversal.

Further, when the workpiece, which has been inverted and tilted substantially vertically, is cut by a cutting tool such as a saw blade that is driven horizontally,
Since the work is inclined with respect to the cutting tool, cutting work can be executed by reducing the cutting resistance of the work, and practical effects such as the ability to use a small output motor for the cutting tool to suppress capital investment in the work cutting device can be suppressed. There is.

[Brief description of the drawings]

FIG. 1A is a plan view of a jig in a work reversing device according to an embodiment of the present invention, FIG. 1B is a front view of the jig,
(C) is a left side view of the jig.

2A is a front view of a jig before turning over the work of the work reversing device of FIG. 1, FIG. 2B is a front view of the jig after turning over the work, and FIG. 2C is a front view of the jig after turning over the work; Side view.

FIG. 3 is a front view of the jig of FIG. 2 (C).

FIG. 4 is a front view showing the outline of the work cutting and finishing equipment.

FIG. 5A is a side view including a partial cross section of a work,
(B) is a front view including a partial cross section of the work.

FIG. 6 is a side view of a main part of a conventional work reversing device.

7 is a front view of the jig at the time of reversing the work in the work reversing device of FIG. 6;

FIG. 8 is a current graph showing a relationship between a load current of an electric motor for driving a cutting tool and a cutting position at the time of cutting a work by the cutting tool.

[Explanation of symbols]

 Reference Signs List 1 work 3 cutting tool (saw blade) 5 jig 6 spherical bearing 7 spherical bearing 9 actuator

Claims (3)

[Claims] 1. A jig holding a work carried on a substantially horizontal jig surface is rotated by approximately 90 ° in a vertical direction with bearings provided at both ends thereof as fulcrums to move the work from a substantially horizontal posture to a substantially vertical posture. The bearings installed at both ends of the jig rotate a substantially horizontal jig about 90 ° with the bearing as a fulcrum, and the jig surface rotates to a substantially vertical plane. A work reversing device, characterized in that the work reversing device is a spherical bearing that is offset horizontally and vertically so as to tilt at a constant angle in a direction substantially parallel to a vertical plane. 2. The work reversing device according to claim 1, wherein an actuator for urging a vertical reciprocating rotational force is attached to the jig. 3. The work held by the jig is inverted with a jig from a horizontal posture to a substantially vertical posture, and the work is machined by a blade tool that is driven horizontally. The work reversing device as described.