JP2004291066A - Incremental forming method and tool therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool with which a projection tending to occur on a working part in incremental forming is prevented. <P>SOLUTION: The tool 300 for incremental forming is fed in the arrow F<SB>1</SB>direction and the part 320 of the tool 300 is pushed to a work 10 and the working part 20 is incrementally formed. A pushing surface 372 in the lower surface of a projection pushing member 370 existing at the opposite side from the working part 20 of the tool 300 is brought into contact with the upper surface of the work 10. When the tool 300 is fed in the arrow F<SB>1</SB>direction under this state, the projection pushing member 370 receives rotational force in the arrow R1 direction with respect to the tool body with friction between the upper surface of the work 10 and the pushing surface 372 of the projection pushing member 370. The end part 372 at the opposite side in the feeding direction F<SB>1</SB>of the tool for projection pushing member 370 by the rotation is bumped against the working part 20 for incremental forming and the rotation is regulated. The rotation of the projection pushing member 370 is stopped with this action and held at this position. While keeping this state, the incremental forming is processed. Since the pushing surface 372 at the lower surface of the projection pushing member 370 always pushes the upper surface of the work 10, the occurrence of the projection according to the incremental forming is prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sequential forming method and a tool for forming a metal material without using a press die.
[0002]
[Prior art]
Japanese Patent Application Laid-Open Publication No. 2004-228707 discloses a sequential forming means for sequentially forming along a contour line in correspondence with the shape of a product to be formed while a rod-shaped tool is in contact with the surface of a metal plate material.
[0003]
[Patent Document 1]
JP 2002-1444 (European Patent Application Publication No. 1147832A2)
[0004]
[Problems to be solved by the invention]
In FIG. 4, a sequential forming apparatus denoted by reference numeral 100 as a whole includes a table 110 on which a workpiece 10 made of a metal plate, which is a forming material arranged in an XY plane, is placed, and the periphery of the workpiece is placed on the table 110. A work clamp 120 for clamping is provided. The periphery of the workpiece 10 is held and fixed between the table 110 and the workpiece clamp 120. The table 110 moves up and down. There is a mold corresponding to the molding part 20 at the center of the table 10. This mold does not move in the vertical direction.
[0005]
The sequential forming tool 150 is mounted on a spindle (not shown) or the like, can move relative to the workpiece 10 along the XY plane, and can also move in the Z-axis direction.
In the sequential forming process, the sequential forming tool 150 is brought into contact with the workpiece 10 and moved along the contour line of the forming unit 20 while being relatively moved in the horizontal direction on the XY plane along the shape of the forming unit 20. The sequential forming processing tool 150 and the table 110 are moved in the X-axis direction to perform the sequential forming processing. The sequential forming tool 150 is along the vertical direction (Z-axis direction).
[0006]
The sequential forming process condition varies depending on the material of the workpiece 10.
For example, when the workpiece 10 is an aluminum alloy plate, the feed speed between the tool 150 and the workpiece 10 is about 30000 mm per minute at the maximum, and the contour pitch is about 0.5 mm.
During machining, the tip of the tool 150 is always in contact with the workpiece 10.
[0007]
FIG. 5 is an explanatory view showing details of the sequential forming process.
The processing material (workpiece) 10 moves along the contour line, with the sequential forming tool 150 descending in the direction of the pitch P ₁ toward the contour line position corresponding to the shape of the processing part 20. When the tool 150 makes a round and returns, this is repeated, and the processing portion 20 is sequentially formed from the upper edge 20a toward the lower edge 20b.
The tip of the sequential forming tool 20 is formed in an arc shape. The tool 20 is fixed about the axis or held against the spindle for free rotation.
[0008]
Since the workpiece 10 is made of a plate material such as a steel material or an aluminum material, a protrusion (swelling) 20c naturally occurs on the opposite side of the sequential forming tool with respect to the processed portion 20 as the sequential forming process proceeds.
The generation mechanism of the protrusions 20c is due to springback when plastic working is performed on a workpiece that is a metal material.
The height of the protrusion 20c increases as the sequential forming process proceeds. When the protrusion 20c becomes large, the sequential forming process is forced to be interrupted.
The present invention provides a sequential molding method that prevents the occurrence of such protrusions.
[0009]
[Means for Solving the Problems]
The sequential forming method of the present invention is a member that presses substantially the same plane as the main body of the processing tool, and performs processing while pressing the workpiece. The processing tool also includes a shank portion mounted on the spindle of the sequential forming apparatus, a tool main body portion continuous with the shank portion, a tip portion in contact with the workpiece, and a protrusion pressing device attached to the main body portion. The apparatus includes a housing that is rotatably attached to the tool body, and a protrusion pressing member that is fixed to the housing.
[0010]
The protrusion pressing member of the protrusion pressing device has a substantially fan-shaped planar shape, and the lower surface of the protrusion pressing member is disposed in substantially the same plane as the tip of the tool.
Further, the housing of the protrusion pressing device is attached to the tool body through a radial bearing and a thrust bearing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a sequential forming tool of the present invention.
The sequential forming tool denoted as a whole by reference numeral 300 has a shank portion 310 attached to the spindle of the sequential forming apparatus, and a screw portion 312 is provided near the lower end of the shank portion 310.
[0012]
The housing 360 of the protrusion pressing device is fixed to the sequential forming tool body 314 by the nut member 330 using the screw portion 312.
A radial bearing 350 is provided inside the housing 360 and is rotatably attached to the tool body 314.
[0013]
A thrust bearing 352 is disposed between the nut member 330 and the large-diameter stopper member 340 on the tip side of the tool 300, and has a structure that resists thrust in the axial direction with respect to the housing 360.
A protrusion pressing member 370 is attached to the housing 360 by a bolt 362. The protrusion pressing member 370 has, for example, a fan shape as a planar shape, and the lower surface 372 forms a flat pressing surface.
[0014]
The tip portion of the sequential forming tool 300 has a stepped portion that supports the stopper member 314, has a dimension that is larger in diameter than the main body portion 314, and the tip portion forms an arcuate machining tip portion 320. This contacts the workpiece 10.
The front end portion of the processing front end portion 320 and the lower surface 372 of the protrusion pressing member 370 are on substantially the same plane. The shank 310, the stopper 314, and the processing tip part 320 are provided by processing the rod-shaped member.
Width L ₁ of the projecting holding member 370 is larger than the width of the protrusion 20c that would result if there is no pressing member 370. The pressing member 370 presses the portion of the protrusion 20c so that the protrusion 20c does not occur. The pressing member at the tip in the moving direction of the tool 300 is chamfered on a slope. The arc-shaped distance from the front end portion 373 to the rear end portion 374 of the protrusion pressing member 370 is a range where the protrusion 20c will be generated, and is about 120 ° C.
[0015]
FIG. 2 is an explanatory view showing the operation of the sequential forming tool of the present invention.
Sequential molding tool 300 is sent to the direction of arrow F _1, the tip portion 320 is pressed against the workpiece 10 is subjected to sequential molding a processing unit 20.
A pressing surface 372 at the lower end of the protrusion pressing member 370 existing on the opposite side of the processing portion 20 of the sequential forming processing tool 300 is in contact with the upper surface of the workpiece 10.
[0016]
When the tool 300 is sent to the direction of arrow F ₁ in this state, the friction between the pressing surfaces 372 of the upper surface and the protrusion pressing member 370 of the workpiece 10, the protrusion pressing member 370 in the arrow R1 direction with respect to the tool body rotational force Receive.
By this rotation, the end portion 374 of the protrusion pressing member 370 hits the processing portion 20 of the sequential forming process, and the rotation is restricted.
[0017]
By this action, the rotation of the protrusion pressing member 370 is stopped and held at that position.
While maintaining this state, the sequential molding process proceeds.
Since the pressing surface 372 on the lower surface of the protrusion pressing member 370 always presses the upper surface of the workpiece 10, the generation of protrusions associated with the sequential forming process is prevented.
[0018]
FIG. 3 shows another example of use of the sequential forming tool 300 of the present invention.
This usage example shows a case where the processing part 20 of the sequential forming process forms a curved surface.
Sequential molding tool 300 of the present invention has a function described above, is sent to the sequential molding tool 300 is direction of arrow F _1, when carrying out incremental forming process in the processing unit 20, projection pressing member 370 It is pressed against the upper surface of the workpiece 10 by receiving the frictional force to rotate in an arrow R ₁ direction.
[0019]
This rotation is regulated at a position where the rear end portion 374 of the protrusion pressing member 370 contacts the processed portion 20 and passes through the curved surface.
That is, according to the sequential forming tool of the present invention, a necessary sequential forming process can be performed without generating protrusions even on a processed part having a curved plane shape.
In the above embodiment, as shown in FIG. 2, the molding portion 20 is on the left side of the drawing, and the projection pressing member 370 is on the right side. However, the projection pressing member 370 rotates and the rear end 374 is in contact with the molding portion 20. Since the position is determined, the molding part 20 may be on the right side. When the molding part 20 is on the right side, the front end 373 is the rear end.
Further, in the above embodiment, the peripheral portion of the workpiece 10 is clamped, so that the protrusion 20c is likely to be generated, but it can also be used for a case where the central portion is fixed as in [Patent Document 1]. Explanation]
FIG. 1 is an explanatory view showing a sequential forming tool of a sequential forming apparatus according to the present invention. (A) is a top view, (b) is a bottom view of (a).
FIG. 2 is an explanatory view showing a processing step of the sequential forming apparatus of the present invention. (A) is a top view, (b) is the figure which looked at (a) from the running direction.
FIG. 3 is an explanatory view showing a processing tool of the sequential forming apparatus of the present invention.
FIG. 4 is an explanatory diagram of a conventional sequential forming process.
FIG. 5 is an explanatory diagram of distortion generated by a conventional sequential forming process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Work material 20 Molding part 100 Sequential molding apparatus 110 Table 120 Work clamp 150 Sequential molding tool 300 Sequential molding tool 310 of this invention Shank part 314 Main body 360 Housing 370 Protrusion pressing member 372 Protrusion pressing surface

Claims (7)

In the sequential molding method of moving along the contour line to be molded while pressing the workpiece with the tool body,
A sequential forming method characterized by moving together with the tool body and pressing the workpiece with a pressing member that is substantially flush with the tip of the tool body. The sequential forming method according to claim 1, wherein the tip of the tool main body and a member that presses substantially the same plane are installed on the tool main body. 3. The sequential forming method according to claim 2, wherein the member is rotatably installed on the tool body. A shank part mounted on the spindle of the sequential forming apparatus, a tool body part continuous with the shank part, a tip part in contact with the workpiece, and a protrusion pressing device attached to the main body part. A sequential forming tool including a housing that is rotatably mounted and a protrusion pressing member that is fixed to the housing. The sequential forming tool according to claim 4, wherein the protrusion pressing member of the protrusion pressing device has a substantially fan-shaped planar shape. The sequential forming tool according to claim 4, wherein a lower surface of the protrusion pressing member of the protrusion pressing device is disposed on substantially the same plane as the tip portion of the tool. The sequential forming tool according to claim 4, wherein the housing of the projection pressing device is attached to the tool main body portion via a radial bearing and a thrust bearing.

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