JP6576420B2 - Double-sided milling machine - Google Patents

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 that can simultaneously process two opposing surfaces of a workpiece.

As a conventional double-sided side milling machine, there is the following conventional technique (see Patent Document 1).
This prior art is a milling machine with a built-in numerical controller that performs milling of two opposing surfaces of a rectangular workpiece.

In this double-headed side milling machine, a mill is attached to the main shafts of the first and second heads, and a table for fixing the work along a moving path disposed between the first and second heads. Is provided so as to be movable.
The pair of milling cutters can simultaneously mill two opposing surfaces of the workpiece positioned and fixed on the table on the indexing base as the spindle rotated by the drive motor rotates.

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

  In the above-described conventional milling machine, the work is fixed on the table by the pressing tool pressing the work positioned and set on the table on the indexing base by the downward extension of the rod of the press cylinder. And the index stand which made the workpiece | work the fixed state can rotate the periphery of the rotating shaft line.

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

If the axial line between the pressing cylinder and the index table that rotates the table is displaced due to these deformations and bending displacements, the workpiece cannot be fixed accurately.
Also, if the workpiece is not a single piece, but a stack of multiple thin workpieces, a slight slip occurs between the thin workpieces of each piece, and the side of the entire workpiece is displaced, so accurate end face processing is possible. There is also the problem of being unable to do so.
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

  In view of the above circumstances, an object of the present invention is to provide a double-sided side milling machine capable of performing accurate end face machining of a workpiece.

A double-headed side milling machine according to a first aspect of the present invention is provided with two machining heads arranged opposite to each other and movably provided so as to pass between the two machining heads , a lower frame part and an upper frame part 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 that clamps a workpiece, and the upper clamp mechanism includes a clamp cylinder, a rod thereof, and a pressing tool connected to a lower end of the rod, and the pressing tool is provided on the index table. The first control motor moves up and down on the same axis as the axis and clamps the workpiece with the indexing table with the pusher. The output shaft of the first control motor is directly connected to the indexing table. Direct drive And a second control motor for rotating the rod about its axis, the second control motor having a direct drive whose output shaft is directly connected to a clamp cylinder constituting the upper clamp mechanism A through hole is formed in the shaft center of the output shaft, and the 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 The upper clamp mechanism is rotated.
Double head side milling of the third invention, in the first invention, wherein the frame portion includes a top plate for mounting said upper clamping mechanism, the support column connected between one end and the lower frame portion of the top plate And a deformation suppressing column connected between the other end of the top plate and the lower frame portion.

According to the first invention, the following effects are obtained.
a) Since the index table provided in the lower frame part and the upper clamp mechanism provided in the upper frame part are arranged on the same axis, even if the clamping force is increased, bending deformation or the like occurs in the upper clamp mechanism. It is difficult to clamp the workpiece with a sufficiently large force. For this reason, the end surface of the workpiece can be machined at an accurate angle.
b) Since direct motors are 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 index table also has an upper clamp mechanism. Can be made compact, and since no gear is used, the occurrence of rotational angle errors such as backlash can be prevented.
According to the second invention, the first and second control motors start and stop synchronously and rotate only by the same angle. Therefore, between the index table and the workpiece, and between the upper clamp mechanism and the workpiece. No rotational misalignment occurs. For this reason, extremely accurate double-sided processing is possible.
According to the third invention, since the upper clamp mechanism is supported by the upper frame part of both ends, even if the clamping force is increased, the upper frame part is hardly deformed or distorted, and the workpiece can be clamped with a sufficiently large force. . For this reason, the end surface of the workpiece can be machined at an accurate angle.

It is a principal part side view of the double-headed side milling machine which concerns on one Embodiment of this invention. It is principal part sectional drawing around the 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-headed side milling machine shown in FIG.

Next, an embodiment of the present invention will be described with reference to the drawings.
First, the basic configuration of the double-sided side milling machine of this embodiment will be described.

  4 and 5, reference numeral 1 denotes a base, and a rail 2 is provided on the upper surface of the base 1 in the front-rear direction (the left-right direction in FIG. 4 and the front-back direction in FIG. 5). A processing frame 3 is attached so as to be movable on the rail 2. The processing frame 3 includes a lower frame portion 4 and an upper frame portion 5 provided above the lower frame portion 4. An index 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 index table 6, and a work W is placed on the table 63.

  An upper clamp mechanism 7 is attached to the upper frame portion 5, and its axis coincides with an axis passing through the center of rotation of the index base 6. The upper clamp mechanism 7 sandwiches the workpiece W between the index table 6 and the upper clamp mechanism 7 (specifically, between the table 63 and a pressing tool 73 described later), and places the workpiece W on the index table 4. Can be fixed to. If the machining frame 3 is moved along the rail 2, the workpiece W can be moved back and forth together with the machining frame 3.

On the other hand, a pair of left and right machining heads 10 are provided on the left and right sides of the base 1, and the headstocks 11, 11 are located on the center line of the base 1 (intermediate between the two rails 2). It is movable in the approaching / separating direction.
A pair of main shafts are rotatably supported on the pair of main spindle bases 11 and 11, respectively, and the pair of main shafts are provided horizontally so that their axis centers coincide with each other. Cutters 13 and 13 are respectively attached to one end portions of the pair of main shafts, and the other end portions of the main shafts are connected to the main shaft of the motor 14 provided on the upper portion of the main shaft base 11. .
For this reason, if the motors 14 and 14 are driven, the cutters 13 and 13 can be rotated.

  Since it is the above basic composition, according to the double-sided side milling machine of this embodiment, work W is attached to the upper surface of table 63 on index stand 6, and a pair of processing heads 10, 10 is moved toward the machining frame 3, the motor 13 is driven to rotate the cutter 13, and the workpiece W is fed back and forth by the machining frame 3, the front and back surfaces of the workpiece W are cut at once by the cutter 13. Can do.

Next, features of the present invention will be described with reference to FIGS.
The feature of the present invention lies in the structure in which the upper frame portion 5 that supports the upper clamp mechanism 7 and the axes of the index base 6 and the upper clamp mechanism 7 are aligned.

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

When the top plate 51 is supported by the support column 52 and the deformation suppression column 53 at both ends as in the present embodiment, a double-supported portal structure is obtained. The top plate 51 does not have 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 rigidity sufficient to withstand compressive load and bending load to support the top plate 51 and the upper clamp mechanism 7.
The deformation suppressing column 53 may be a member having a strength sufficient to withstand a sufficient tensile strength for suppressing the warping of the top plate 51 that occurs during clamping.
Since the support column 52 and the deformation suppression column 53 perform their respective functions, generally, the support column 52 is configured by a thick columnar member, and the deformation suppression column 53 is configured by a bar-shaped member.

According to this double-supported gate 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 base 6 are kept in alignment with each other without being displaced from each other. . For this reason, the workpiece W does not finely move on the index table 4 during clamping. Moreover, even if it is the workpiece | work W which laminated | stacked the plate-shaped member, the shift | offset | difference does not generate | occur | produce between each plate-shaped member. Therefore, the end surface of the workpiece W can be processed at an accurate angle.

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

  The index table 6 is a device that equally divides 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 the main shaft 82 is directly coupled to the rotary shaft 61 of the index base 6. A thrust bearing 62 supports the rotating shaft 61. A table 63 for fixing the workpiece W is connected to the rotary shaft 62.

  The first control motor 8 is a servo motor with high controllability, and is a direct motor structured so as to directly drive the index base 6 in terms of structure. When the direct motor is used, the reduction gear required for a normal servo motor is not used. Therefore, the first control motor 8 is compact, and an inevitable backlash does not occur in the gear reduction gear. There is an advantage that can be accurately.

(Upper clamp mechanism 7 circumference)
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 includes 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 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 with respect 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. Since the rod 72 passes through the second control motor 9 in this way, the axis of the upper clamp mechanism 7 including the rod 72 and the pressing tool 73 is exactly coincident with the axis passing through the rotation center of the index base 6. It is supposed to be. For this reason, even if the clamping force is increased, bending deformation or the like hardly occurs in the upper clamping mechanism 7, and the workpiece W can be clamped with a sufficiently large force. For this reason, the end surface of the workpiece W can be machined at an accurate angle.

  With the above configuration, when the second control motor 9 is rotated, the clamp cylinder 71 can be rotated via the inner housing 57, and the rod 72 and the pusher 73 can be rotated.

  The second control motor 9 is a servo motor 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 has a configuration that does not use a speed reducer required for an ordinary servo motor, the second control motor has a compact configuration. Further, since an inevitable backlash does not occur in the gear reducer, there is an advantage that the indexing angle can be made accurate.

Both the first control motor 8 and the second control motor 9 are servo motors for control, and both rotate synchronously and can rotate the indexing base 6 and the upper clamp mechanism 7 by the same angle.
Thus, the first and second control motors 8 and 9 start and stop synchronously and rotate only by the same angle, so that the upper clamp mechanism 7 and the work W are interposed between the indexing table 6 and the work W. There is no rotational deviation between the two. For this reason, very accurate indexing can be performed.

Next, the advantages of this embodiment will be described.
(1) In the present embodiment, the index 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, so that even if the clamping force is increased Bending deformation or the like is unlikely 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 surface of the workpiece W can be machined at an accurate angle.
(2) Since the upper clamp mechanism 7 is supported by the upper frame portion 5 that is supported at both ends, even if the clamping force is increased, the upper frame portion 5 is not easily deformed or distorted, and the workpiece W can be clamped with a sufficiently large force. . For this reason, the end surface of the workpiece W can be machined at an accurate angle.

(3) In the present embodiment, when the workpiece W on the index table 6 is rotated, the upper clamp mechanism 7 is also rotated in synchronization. This synchronous operation rotates the first and second control motors 8 and 9 synchronously. Is done. Accordingly, there is no rotational displacement between the upper surface (between the pressing tool 73) and the lower surface (between the indexing base 6) of the workpiece W.
For this reason, the right angle between a pair of side surface of the workpiece | work W and another pair of side surface can be taken out correctly. Further, even if the workpieces W are a laminate of a plurality of workpieces, there is no rotational displacement between the workpieces W, and therefore all the workpieces W can be accurately machined.

DESCRIPTION OF SYMBOLS 1 Base 2 Rail 3 Processing frame 4 Lower frame part 5 Upper frame part 6 Index stand 7 Upper clamp mechanism 8 1st control motor 9 2nd control motor 51 Top plate 52 Support column 53 Deformation suppression column

Claims (3)

Two machining heads arranged opposite each other;
A processing frame that is movably provided so as to pass between the two processing heads, and includes a lower frame portion and an upper frame portion ;
Provided in the lower frame portion, and the indexing table is rotated by the first control motor about an axis perpendicular,
Provided on said frame portion, and an upper clamping mechanism for clamping the workpiece on previous SL indexing table,
The upper clamp mechanism includes a clamp cylinder, a rod thereof, and a pressing tool connected to a lower end of the rod,
The pressing tool moves up and down on the same axis as the axis of the indexing table, and clamps the workpiece with the pressing tool between the indexing table and the indexing table,
The first control motor is a direct drive motor whose output shaft is directly connected to the index table,
A second control motor for rotating the rod around its axis, the second control motor being a direct drive motor whose output shaft is directly connected to a clamp cylinder constituting the upper clamp mechanism; A double-sided side milling machine , wherein a through hole is formed in an axis of the output shaft, and a rod of the clamp cylinder passes through the through hole . The first control motor and second control motor is a servo motor, both rotate synchronously, claim 1 Symbol, characterized in that rotating the indexing table and the upper clamping mechanism by the same angle Double-headed side milling machine. The upper frame part is
A top plate for mounting the upper clamp mechanism;
A support column connected between one end of the top plate and the lower frame part;
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 part.

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