JP2019104085A - Double-sided side milling machine - Google Patents

Abstract

To provide a double-sided side milling machine which does not cause the rotational displacement of a workpiece, and can perform exact end-face processing.SOLUTION: A double-sided side milling machine comprises: an index head 6 arranged at a lower frame part 4 of a processing frame 3, and rotated by a first control motor 8; an upper clamp mechanism 7 arranged at an upper frame part 5 of the processing frame 3; and a second control motor 9 for rotating the upper clamp mechanism 7. The second control motor 9 is a direct drive motor whose output shaft is directly connected to a clamp cylinder 71, and in which a penetration hole is formed at an axial core, and a rod 72 of the clamp cylinder penetrates the penetration hole. Since the index head arranged at the lower frame part 4 and the upper clamp mechanism 7 arranged at the upper frame 5 are arranged on the same axial line, even if a clamp force is increased, bending deformation hardly occurs at the upper clamp mechanism 7, and a workpiece W can be clamped by a sufficient large force. By this constitution, an end face of the workpiece W can be processed at an exact angle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double-sided side milling machine. More specifically, the present invention relates to a double-sided side milling machine capable of simultaneously processing two opposing faces of a workpiece.

As a conventional double-sided side milling machine, there is the following prior art (see Patent Document 1).
This prior art is a milling machine with a built-in numerical control device for milling two opposing faces of a rectangular workpiece.

In this double-sided side milling machine, a milling cutter is attached to the main shaft of the first and second two heads, and a table for fixing the work along the moving path disposed between the first and second heads. Are provided movably.
The pair of milling cutters can simultaneously mill two opposing surfaces of the work positioned and fixed on the table on the indexing table as the main spindle rotated by the drive motor rotates.

In this milling machine, a C-shaped frame is erected on a base so as to straddle the table, and a pressing cylinder is attached downward to the C-shaped frame. The pressing cylinder is cantilevered by a C-shaped frame.
The bracket, which is moved up and down by the rod of the pressing cylinder, is mounted with a pressing tool so as to be rotatable about a vertical axis, and a motor is mounted to rotate the pressing tool. The axis of the pressing tool is set to coincide with the axis of rotation of the table assumed to have stopped at the positioning set location. However, the axis of the pressing cylinder and the axes of the motor and the pressing tool are in a laterally eccentric position.

  In the above-mentioned prior art milling machine, the work is fixed on the table by pressing the work positioned and set on the table on the indexing table by the downward extension of the rod of the press cylinder. Then, the indexing table in which the work is fixed can be rotated about its rotation axis.

  However, in the above prior art, since the pressing cylinder is supported in a cantilever manner, even if the pressing tool is pressed against the work by the pressing cylinder and strongly clamped between the table and the table, the C-shaped frame itself tends to be deformed . In addition, since the output shaft of the pressing cylinder and the axis of the pressing tool are laterally offset, bending displacement may occur in the pressing tool.

If the axis of the pressing cylinder and the indexing table which rotates the table is displaced due to these deformations and bending displacements, the work can not be fixed accurately.
In addition, if the work is not a single piece, but a plurality of thin plate works are stacked, slight slippage occurs between the thin plate works of each sheet and the entire side of the work shifts, so accurate end face processing There is also the problem that it can not be done.
In particular, the above problem is likely to occur when the pressing force by the pressing cylinder is increased, that is, when a large clamping force is required.

JP 2012-76183 A

  SUMMARY OF THE INVENTION In view of the above-described circumstances, the present invention has an object to provide a double-sided side milling machine capable of performing accurate end surface processing of a workpiece.

According to a first aspect of the present invention, there is provided a double-sided side milling machine comprising: two processing heads disposed opposite to each other; a processing frame movably provided to pass between the two processing heads; and the processing frame is a lower frame And an upper frame, provided on the lower frame portion, an indexing table rotated by the first control motor about a vertical axis, and an axis of the indexing table provided on the upper frame portion, and It is characterized in that it comprises an upper clamp mechanism which clamps the workpiece on the indexing table in a clamping operation on the same axis, and a second control motor which rotates the upper clamp mechanism about its axis.
In the double-sided side face milling machine according to a second aspect of the present invention, in the first aspect, the first control motor is a direct drive motor whose output shaft is directly connected to the indexing table, and the second control motor has an output shaft The direct drive motor is directly connected to a clamp cylinder constituting the upper clamp mechanism, and the second control motor is formed with a through hole at an axial center, and a rod of the clamp cylinder passes through the through hole. It is characterized by
According to a third aspect of the present invention, in the first aspect or the second aspect, the first control motor and the second control motor are servomotors, which rotate in synchronization with each other and rotate the indexing table by the same angle. And rotating the upper clamp mechanism.
According to a fourth aspect of the present invention, in the first aspect, the upper frame portion includes a top plate to which the upper clamp mechanism is attached, and a support column connected between one end of the top plate and the lower frame portion. And a deformation suppression column connected between the other end of the top plate and the lower frame portion.

According to the first aspect of the invention, since the indexing table provided on the lower frame portion and the upper clamp mechanism provided on the upper frame are arranged on the same axis, the upper clamp mechanism is bent even if the clamp force is increased. It is hard to generate deformation and can clamp the work with a sufficiently large force. Therefore, the end face of the workpiece can be machined at an accurate angle.
According to the second aspect of the invention, the direct motor is used as the first control motor and the second control motor, and the rod of the clamp cylinder passes through the through hole passing through the axis of the second control motor. Both the base and the upper clamp mechanism can be made compact, and since no gear is used, it is possible to prevent the occurrence of a rotational angle error such as backlash.
According to the third invention, since the first and second control motors start and stop synchronously and rotate only at the same angle, between the indexing table and the work and between the upper clamp mechanism and the work There is no rotational shift at all. This enables extremely accurate double-sided processing.
According to the fourth aspect of the invention, since the upper clamp mechanism is supported by the upper frame portion having both ends, deformation or distortion is less likely to occur in the upper frame portion even if the clamping force is increased, and the workpiece can be clamped with a sufficiently large force . Therefore, the end face of the workpiece can be machined at an accurate angle.

It is a principal part side view of the double-sided side milling machine concerning one embodiment of the present invention. It is principal part sectional drawing around an index stand shown in FIG. It is principal part sectional drawing around the upper clamp mechanism shown in FIG. 1 is an overall side view of a double-sided side milling machine according to the present invention It is a whole front view of the double-sided side milling machine shown in FIG.

Next, an embodiment of the present invention will be described based on the drawings.
First, the basic configuration of the double-sided side milling machine of the present embodiment will be described.

  In FIG. 4 and FIG. 5, reference numeral 1 denotes a base, and rails 2 are provided on the upper surface of the base 1 in the front-rear direction (left and right direction in FIG. 4; front and back in FIG. 5). The processing frame 3 is attached movably on the rail 2. The processing frame 3 comprises a lower frame portion 4 and an upper frame portion 5 provided above the lower frame portion 4. An indexing table 6 is provided on the upper surface of the lower frame portion 4, and a table 63 is provided on the upper surface of the indexing table 6, and the work W is placed on the table 63.

  An upper clamp mechanism 7 is attached to the upper frame portion 5, and the axis thereof coincides with the axis passing through the rotation center of the indexing table 6. The upper clamp mechanism 7 sandwiches the work W between the indexing table 6 and the upper clamping mechanism 7 (specifically, between the table 63 and a pressing tool 73 described later), and the work W is placed on the indexing table 4. It can be fixed to Then, by moving the processing frame 3 along the rails 2, the workpiece W can be moved back and forth together with the processing frame 3.

On the other hand, on the left and right sides of the base 1, a pair of left and right machining heads 10, 10 are provided, and their headstocks 11, 11 are with respect to the center line of the base 1 (middle of two rails 2). It is movable in the approaching and separating directions.
A pair of main spindles are rotatably supported by the pair of headstocks 11 and 11, respectively, and the pair of main spindles are horizontally provided such that their axes coincide with each other. The cutters 13 and 13 are attached to the opposite ends of the pair of spindles, and the other ends of the respective spindles are connected to the spindle of the motor 14 provided on the top of the spindle stock 11 .
For this reason, if the motors 14 and 14 are driven, the cutters 13 and 13 can be rotated.

  With the above basic configuration, according to the double-sided side milling machine of the present embodiment, the work W is attached to the upper surface of the table 63 on the indexing table 6, and a pair of processing heads 10 is provided by the amount necessary to process the work W. 10 is moved toward the processing frame 3 and the motor 13 is driven to rotate the cutter 13 so that the workpiece W is sent back and forth by the processing frame 3, the cutter 13 cuts both front and back surfaces of the workpiece W at one time Can.

Next, the features of the present invention will be described based on FIGS. 1 to 3.
The feature of the present invention lies in the structure in which the upper frame portion 5 supporting the upper clamp mechanism 7 and the axes of the indexing table 6 and the upper clamp mechanism 7 coincide with each other.

  First, as shown in FIG. 1, the upper frame portion 5 has a gate-shaped structure. That is, the upper frame portion 5 of the present embodiment includes a top plate 51 to which the upper clamp mechanism 7 is attached, a support column 52 connected between one end of the top plate 51 and the lower frame portion 4, and It consists of a deformation suppression column 53 connected between the other end and the lower frame part 4.

As in the present embodiment, when the top plate 51 is supported by the support column 52 and the deformation suppression column 53 at both ends, a double-ended gate structure is formed. The top plate 51 does not need to be plate-shaped, and may be a member having a structure suitable for firmly fixing the upper clamp mechanism 7.
The support column 52 may be a member having a rigidity sufficient to bear a compression load and a bending load sufficient to support the top plate 51 and the upper clamp mechanism 7.
The deformation suppressing column 53 may be a member having a strength that can endure a sufficient tensile strength for suppressing the warping of the top plate 51 generated at the time of clamping.
Since the support column 52 and the deformation suppression column 53 perform their respective functions, generally speaking, the support column 52 is constituted by a thick columnar member, and the deformation suppression column 53 is constituted by a rod-like member.

  According to this double-ported structure, even if the upper clamp mechanism 7 exerts a large clamping force, the upper frame portion 5 is unlikely to be deformed or distorted. For this reason, even if the workpiece W is clamped with a sufficiently large force, the axes of the upper clamp mechanism 7 aligned with the axis of the indexing table 4 do not deviate from each other, and are kept in the aligned state. . Therefore, the work W does not move slightly on the indexing table 4 at the time of clamping. Moreover, even if it is the workpiece | work W which laminated | stacked the plate-shaped member, a shift | offset | difference does not generate | occur | produce between each plate-shaped member. Therefore, the end face of the workpiece W can be processed at an accurate angle.

Next, the periphery of the indexing table 6 and the upper clamp mechanism 7 will be described.
(Around index stand)
As shown in FIGS. 1 and 2, the lower frame portion 4 of the processing frame 3 is provided with an indexing table 6 as described above.

  The indexing table 6 is a device for equally dividing the outer peripheral surface of the workpiece W into an arbitrary number, and is connected to the first control motor 8. The motor main body 81 of the first control motor 8 is fixed to the lower frame portion 4, and its main shaft 82 is directly coupled to the rotation shaft 61 of the indexing table 6. 62 is a thrust bearing that supports the rotating shaft 61. A table 63 for fixing the work W is connected to the rotation shaft 62.

  The first control motor 8 is a servomotor with high controllability, and is structurally a direct motor configured to drive the indexing table 6 directly. When a direct motor is used, the first control motor 8 is compact because the reduction gear required for a normal servomotor is not used, and an inevitable backlash does not occur in the gear reduction gear, so the indexing angle Has the advantage of being able to

(Around upper clamp mechanism 7)
As shown in FIGS. 1 and 3, the upper clamp mechanism 7 includes a clamp cylinder 71 and a rod 72, and a pusher 73 is connected to the lower end of the rod 72.

  A fixed housing 55 is used for fixing the upper clamp mechanism 7 to the upper frame portion 5. The fixed housing 55 comprises an outer housing 56 and an inner housing 57. The outer housing 56 has a shape for accommodating the second control motor 9 and is fixed on the top plate 51 of the upper frame portion 5.

The motor main body 91 of the second control motor 9 is fixed to the top plate 51 of the upper frame portion 5, and the main shaft 92 is fixed to the inner housing 57. The inner housing 57 is fixed to the clamp cylinder 71.
The inner housing 57 is rotatable relative to the outer housing 56 via a thrust bearing 58.

  The second control motor 9 is a direct motor, and a through hole 93 is formed in the axial center thereof. The rod 72 of the pressing cylinder 7 passes through the through hole 93. As the rod 72 penetrates the second control motor 9 in this manner, the axis of the upper clamp mechanism 7 including the rod 72 and the pusher 73 is exactly aligned with the axis passing through the rotation center of the indexing table 6. It is supposed to Therefore, bending deformation and the like are less likely to occur in the upper clamp mechanism 7 even if the clamp force is increased, and the workpiece W can be clamped with a sufficiently large force. For this reason, the end face of the workpiece W can be processed at an accurate angle.

  According to the above configuration, when the second control motor 9 is rotated, the clamp cylinder 71 can be rotated via the inner housing 57, and consequently, the rod 72 and the pressing tool 73 can be rotated.

  The second control motor 9 is a servomotor with high controllability, and is structurally a direct motor configured to directly drive the rod 72 of the upper clamp mechanism. Since the direct motor does not use the reduction gear required for a normal servomotor, the second control motor is compact. In addition, since an inevitable backlash does not occur in the gear reducer, an advantage is obtained that the indexing angle can be made accurate.

The first control motor 8 and the second control motor 9 are both servomotors for control, and rotate in synchronization with each other, and can rotate the indexing table 6 and the upper clamp mechanism 7 by the same angle.
As described above, since the first and second control motors 8 and 9 start and stop synchronously and rotate only at the same angle, between the indexing table 6 and the work W, the upper clamp mechanism 7 and the work W There is no rotational displacement at all. For this reason, extremely accurate indexing can be performed.

Below, the advantage of this embodiment is demonstrated.
(1) In the present embodiment, since the indexing table 6 provided in the lower frame portion 4 and the upper clamp mechanism 7 provided in the upper frame 5 are arranged on the same axis, even if the clamping force is increased. Bending deformation and the like are less likely to occur in the upper clamp mechanism 7, and the workpiece W can be clamped with a sufficiently large force. For this reason, the end face of the workpiece W can be processed at an accurate angle.
(2) Since the upper clamp mechanism 7 is supported by the upper frame portion 5 having both ends, deformation or distortion hardly occurs in the upper frame portion 5 even if the clamp force is increased, and the workpiece W can be clamped with a sufficiently large force . For this reason, the end face of the workpiece W can be processed at an accurate angle.

(3) In the present embodiment, when rotating the work W on the indexing table 6, the upper clamp mechanism 7 is also rotated in synchronization, but this synchronous operation rotates the first and second control motors 8, 9 in synchronization. Is done. Therefore, no rotational displacement occurs at all on the upper surface (between the pressing tool 73) and the lower surface (between the indexing table 6) of the workpiece W.
For this reason, the right angle between a pair of side surfaces of the workpiece W and the side surfaces of the other pair can be accurately obtained. In addition, even if the workpiece W is a stack of a plurality of workpieces, no rotational displacement occurs between the workpieces W of each sheet, so that all the workpieces W can be edge-processed accurately.

1 Base 2 Rail 3 Machining Frame 4 Lower Frame 5 Upper Frame 6 Indexing Base 7 Upper Clamping Mechanism 8 First Control Motor 9 Second Control Motor 51 Top Plate 52 Support Column 53 Deformation Suppression Column

The double-sided side milling machine of the first invention is movably provided so as to pass between two processing heads disposed opposite to each other and between the two processing heads, and a lower frame portion and an upper frame portion a processing frame of the said provided at lower frame portion, and the indexing table is rotated by the first control motor about an axis perpendicular, provided on said frame portion, before SL on indexing stand An upper clamp mechanism for clamping a workpiece, the upper clamp mechanism comprising a clamp cylinder, a rod thereof, and a pusher connected to a lower end of the rod, the pusher being of the indexing table The lifting and lowering operation is performed on the same axis as the axis line, and the pressing tool clamps the work by sandwiching the work with the indexing table, and the output shaft of the first control motor is directly connected to the indexing table Direct drive A second control motor for rotating the rod about its axis, the second control motor having a direct drive in which an output shaft is directly connected to a clamp cylinder constituting the upper clamp mechanism The motor is characterized in that a through hole is formed at an axial center of the output shaft, and a rod of the clamp cylinder passes through the through hole .
Double head sides milling machine of the second aspect, in the first shot bright, the first control motor and second control motor is a servo motor, both rotate synchronously, the same angle only the indexing table and the And rotating the upper clamp mechanism.
According to a third aspect of the present invention, in the first aspect, the upper frame portion is a top plate to which the upper clamp mechanism is attached, and a support column connected between one end of the top plate and the lower frame portion. And a deformation suppression column connected between the other end of the top plate and the lower frame portion.

According to the first aspect of the invention, the following effects can be obtained.
a) Since the indexing table provided on the lower frame portion and the upper clamp mechanism provided on the upper frame portion are arranged on the same axis, bending or the like occurs in the upper clamp mechanism even if the clamping force is increased. Hard and can clamp the work with a sufficiently large force. Therefore, the end face of the workpiece can be machined at an accurate angle.
b) Since a direct motor is used as the first control motor and the second control motor, and the rod of the clamp cylinder passes through the through hole passing through the axis of the second control motor, the indexing table is also the upper clamp mechanism Also, since the gear is not used, it is possible to prevent the occurrence of a rotational angle error such as backlash.
According to the second invention, since the first and second control motors start and stop synchronously and rotate only at the same angle, between the indexing table and the work, and between the upper clamp mechanism and the work There is no rotational shift at all. This enables extremely accurate double-sided processing.
According to the third aspect of the invention, since the upper clamp mechanism is supported by the upper frame portion having both ends, deformation and distortion are less likely to occur in the upper frame portion even if the clamping force is increased, and the workpiece can be clamped with a sufficiently large force . Therefore, the end face of the workpiece can be machined at an accurate angle.

According to this double-ported structure, even if the upper clamp mechanism 7 exerts a large clamping force, the upper frame portion 5 is unlikely to be deformed or distorted. For this reason, even if the workpiece W is clamped with a sufficiently large force, the axes of the upper clamp mechanism 7, which is aligned with the axis of the indexing table 6 , do not deviate from each other, and are kept in the same state. . Therefore, the work W does not move slightly on the indexing table 4 at the time of clamping. Moreover, even if it is the workpiece | work W which laminated | stacked the plate-shaped member, a shift | offset | difference does not generate | occur | produce between each plate-shaped member. Therefore, the end face of the workpiece W can be processed at an accurate angle.

Claims (4)

Two processing heads arranged opposite to each other,
A processing frame movably provided to pass between the two processing heads;
The processing frame comprises a lower frame and an upper frame, and an indexing table provided on the lower frame portion and rotated by a first control motor about a vertical axis;
An upper clamp mechanism provided on the upper frame portion, the upper clamp mechanism clamping the workpiece on the index table by clamping on the same axis as the axis of the index table; and rotating the upper clamp mechanism about its axis And a second control motor. The first control motor is a direct drive motor whose output shaft is directly connected to the indexing table,
The second control motor is a direct drive motor whose output shaft is directly connected to a clamp cylinder constituting the upper clamp mechanism, and the second control motor is formed with a through hole at its axial center, the through The double-sided side milling machine according to claim 1, characterized in that a rod of the clamp cylinder passes through a hole. The first control motor and the second control motor are servomotors, which rotate in synchronization with each other and rotate the indexing table and the upper clamp mechanism by the same angle. 2. Double-sided side milling machine as described in 2. The upper frame portion is
A top plate on which the upper clamp mechanism is attached;
A support column connected between one end of the top plate and the lower frame portion;
The double-sided side milling machine according to claim 1, comprising a deformation suppressing column connected between the other end of the top plate and the lower frame portion.

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