JP5976247B1 - Hemming tools - Google Patents

Abstract

The present invention provides a hemming tool for hemming a plate-shaped workpiece, which can be thinly processed. A hemming tool 1 has a locking portion 10 having a locking surface 12a for locking a workpiece, and a centering axis L parallel to the locking surface 12a. The processing portion 20 includes a sliding portion 23 that slides and bends the workpiece to be locked, and a clamping portion 24 that clamps and squeezes the processing member between the locking portion 10 and the locking portion 10. The processed portion 20 rotates around a central axis L parallel to the locking surface 12a, and the workpiece to be processed locked by the locking portion 10 is slid by the sliding portion 23 of the processed portion 20. The workpiece to be processed is clamped and flattened between the locking portion 10 and the workpiece to be bent by the sliding portion 23 by the clamping portion 24 of the processing portion 20. Hemming can be performed without undulation or with small undulation. [Selection] Figure 1

Description

  The present invention relates to a hemming tool for hemming a plate-shaped workpiece.

  By bending the edge of the workpiece such as the edge of the automobile body, the workpiece can be strengthened and the edge can be smoothed. Also, by bending one end of the two members to be joined and covering the other end, the two members to be joined can be joined and the aesthetics of the ends can be maintained. These processes are called hemming processes. For example, with the hemming apparatus described in Patent Document 1, the ends of the member to be processed and other members to be bonded can be preliminarily folded and further bent to perform the main processing. . In the present specification, hereinafter, “hemming process” refers to a process of bending one end of a member to be joined to cover the other end, and “working member” refers to a work to be bent. It refers to a joining member. Further, the “member to be joined” refers to a member to be joined whose end cannot be bent.

  In the hemming process, a method using a large machine such as what is called roller hemming or one described in Patent Document 1 is also used. As shown in Non-Patent Document 1, a method using a commercially available small hemming tool is used. There is also. When a small hemming tool is used, the thickness of the workpiece after machining may not be sufficiently reduced depending on the specifications of the hemming tool. For example, the hemming tool described in Non-Patent Document 1 is difficult to have a thickness of less than 3 mm.

  In recent years, thin plate materials used in automobiles are increasing in number, and there is also a thickness of 0.6 mm. After processing, since the other workpieces are sandwiched by the bent workpieces (two on the front and the back), the processed thickness of the workpieces should be less than 3 times the thickness of the plate. Is required. In the hemming tool described in Non-Patent Document 1, hemming cannot be performed on a plate material having a thickness of 0.6 mm.

JP 2011-78992 A

Application of door hemming tool (http://www.aioinissaydowa-arc.co.jp/pdf/technical/technical_88.pdf)

  An object of the present invention is to provide a hemming tool for hemming a plate-shaped workpiece, which can be thinly processed.

The hemming tool of the present invention is
A hemming tool for hemming a plate-shaped workpiece,
A locking portion having a locking surface for locking the workpiece,
Rotating about a central axis parallel to the locking surface, and a sliding part that slides and bends the workpiece locked by the locking part, and the locking part A clamping part that clamps and flattenes the workpiece to be processed,
The sliding portion has a first curved surface that is substantially arc-shaped when viewed in a direction parallel to the central axis, and the clamping portion has a second curved surface that protrudes outward from the first curved surface with respect to the central axis. It is characterized by having.

  According to this feature, the workpiece is rotated about a central axis parallel to the locking surface, so that the work piece locked by the locking portion is slid by the sliding portion of the processing portion. The workpiece is bent by moving, and the workpiece that is bent by the sliding portion is clamped between the locking portion and flattened by the clamping portion of the processed portion, so that the workpiece is hemmed can do. The sliding portion has a first curved surface that is arcuate when viewed in a direction parallel to the central axis, and the clamping portion has a second curved surface that protrudes outward from the first curved surface 23a with respect to the central axis. The processed part rotates about the central axis, and the clamping part moves closer to the locking surface with respect to the sliding part, so that the workpiece to be bent by the sliding part is held between the clamping part and the locking part. It can be pinched between. Such clamping pressure by the curved surface reduces the fact that the surface of the processed member after processing becomes a non-uniform undulating shape (waving). Here, “sliding” refers to reciprocating rotation about 30 to 90 degrees clockwise and counterclockwise around the central axis.

The hemming tool of the present invention is
The minimum separation distance between the second curved surface and the locking surface is 2 mm or less.

  According to this feature, the minimum separation distance between the second curved surface 24a of the clamping portion for narrowing the workpiece and the locking surface of the locking portion is 2 mm or less, so that the workpiece is hemmed to 2 mm or less. can do. In addition, you may design as arbitrary values of 2 mm or less, for example, 1.8 mm.

The hemming tool of the present invention is
The first curved surface has a radius of curvature of 18 to 22 mm;
The second curved surface has a radius of curvature of 9 to 11 mm;
The distance of the second curved surface protruding outward from the first curved surface is 2 to 4 mm.

  According to this feature, the workpiece can be slid and bent by the sliding portion having the first curved surface having a larger radius of curvature than the second curved surface, and has the second curved surface having a smaller radius of curvature than the first curved surface. The member to be processed can be clamped and flattened between the locking portion by the clamping portion.

The hemming tool of the present invention is
The clamping portion and the sliding portion are respectively provided in a forward direction and a reverse direction in which the workpiece is inserted between the locking portion and the processing portion with respect to the central axis. And

  According to this feature, the workpiece is slid and bent by the sliding portion by rotating the workpiece about the central axis while inserting the workpiece between the locking portion and the workpiece. The bent work member can be crushed by being pinched between the locking portions by the pinching portion.

  According to the hemming tool of the present invention, a plate-like workpiece can be hemmed with small undulations.

FIG. 1 is a diagram illustrating a configuration of a hemming tool. FIG. 2 is a diagram illustrating an operation of a hemming tool for hemming a workpiece. FIG. 3 is a diagram illustrating a state of a workpiece to be hemmed by a hemming tool.

  Hereinafter, an embodiment of the present invention will be described.

  FIG. 1 shows a configuration of a hemming tool 1 according to the present embodiment. 1A and 1B show the hemming tool 1 in a side view and a front view, respectively. Here, the vertical direction of the drawings in FIGS. 1A and 1B is the vertical direction, the horizontal direction of the drawing in FIG. 1A is the horizontal direction, and the horizontal direction of the drawing in FIG. In the hemming tool 1, the workpiece is inserted from right to left in FIG. Here, the left direction is also referred to as the forward direction, and the right direction is also referred to as the reverse direction. The hemming tool 1 is a tool for hemming a plate-shaped workpiece, and includes a locking portion 10, a processing portion 20, and a power portion 30.

  The locking portion 10 is a unit that locks a workpiece, and includes a locking base 11 and a nylon sheet 12.

  The locking base 11 is a member having an L shape in a front view, and a portion having a longitudinal direction as a longitudinal direction (referred to as a fixed portion 11a) is fixed in contact with the side surface of the power unit 30, and the lateral direction is a longitudinal direction. The portion (referred to as a locking portion 11b) extends from the lower end of the fixed portion 11a in the lateral direction (right direction in the drawing). Here, the latching | locking part 11b has the upper surface which inclines in a horizontal direction in side view.

  The nylon sheet 12 is a plate-like member that is supported on the locking base 11 and contacts the workpiece, and has a locking surface 12a extending in the horizontal direction and an inclined lower surface. Here, the lower surface is inclined at an angle equal to the inclination of the upper surface of the locking portion 11b.

  The separation distance between the locking surface 12a of the locking portion 10 and the second curved surface 24a of the clamping portion 24 to be described later varies depending on the arrangement of the nylon sheet 12 and sliding to be described later, but can be a minimum of 1.8 mm. To do. Since the thickness is such that the workpiece can be hemmed, the minimum value is preferably 2 mm or less.

  The processing unit 20 is a unit that processes a member to be processed, and includes a flat table 21 and a hammer 22.

  The flat table 21 is an elliptical plate-like member that supports the hammer 22. In this embodiment, it is assumed that the hammer 22 is integrally formed.

  The hammer 22 is a member that rotates to push and bend the member to be processed, and has a substantially oval shape that is further flat in the lateral direction with respect to the flat table 21 in a side view, and is parallel to the locking surface 12a at the center. It has a central axis L. The hammer 22 includes a sliding portion 23, a pinching portion 24, and a spatula portion 25.

  The sliding portion 23 is a portion that slides and bends the workpiece that is locked by the locking portion 10. The sliding portion 23 is provided in the opposite direction (the right side in FIG. 1A) with respect to the clamping portion 24, and is a first curved surface 23a having an arc shape in a side view (viewed in a direction parallel to the central axis L). Have Here, the first curved surface 23a is an arc having a radius of 20 mm. However, it does not have to be a circular arc, and may be a substantially circular arc whose curvature radius changes. In that case, it is preferable that the variation range of the radius of curvature is in the range of 18 to 22 mm. The member to be processed can be slid and bent by the sliding portion 23 having the first curved surface 23a having a larger radius of curvature than the second curved surface 24a of the clamping portion 24 described later.

  The clamping portion 24 is a portion that clamps and squeezes the workpiece from the locking portion 10. The clamping portion 24 is provided in the forward direction (left side in FIG. 1A) with respect to the sliding portion 23, and in the side view (viewed in a direction parallel to the central axis L) The second curved surface 24a protrudes further outward from the first curved surface 23a. As a result, the processing portion 20 is rotated about the central axis L, and the clamping portion 24 is brought close to the locking surface 12a with respect to the sliding portion 23, thereby being bent by the sliding portion 23. The member can be clamped between the clamping part 24 and the locking part 10. Here, the second curved surface 24a is a circular arc having a radius of 10 mm. However, it does not have to be a circular arc, and may be a substantially circular arc whose curvature radius changes. In that case, it is preferable that the fluctuation range of the radius of curvature is in the range of 9 to 11 mm. The member to be processed can be pinched and flattened between the locking portion 10 by the pinching portion 24 having the second curved surface 24a having a smaller radius of curvature than the first curved surface 23a.

  The second curved surface 24a protrudes outward by 3 mm from the first curved surface (denoted by D in the figure). The member to be processed bent by the sliding portion 23 (first curved surface 23a) is clamped. The protruding distance is preferably 2 to 4 mm.

  The pinching portion 24 and the sliding portion 23 are provided in the forward direction and the reverse direction with respect to the central axis L, respectively. As a result, as will be described later, by rotating the processing portion 20 around the central axis L while inserting the processing member between the locking portion 10 and the processing portion 20, the sliding portion 23 causes the processing member to be rotated. The workpiece to be bent can be slid and bent, and can be flattened by being pinched between the locking portion 10 by the pinching portion 24.

  The spatula portion 25 is a portion that suppresses the rebound of the workpiece to be crushed by the pinching portion 24 when the hemming tool 1 is moved. The spatula portion 25 is provided in the forward direction (left side in FIG. 1A) with respect to the pinching portion 24, and has one surface that is inclined to the left front in a side view.

  The power unit 30 is a unit that rotates the processing unit 20 (hammer 22), and includes a housing 31 and a power source (not shown). The casing 31 is a cubic box whose longitudinal direction is the horizontal direction, and supports the processed portion 20 (hammer 22) on the central axis L so as to be rotatable. A power source (not shown) is provided in the housing 31 and receives power from the outside to rotate the processing unit 20 (hammer 22).

  Hereinafter, the principle of hemming a workpiece using the hemming tool 1 and the state of the workpiece to be hemmed by the hemming tool will be described.

  FIG. 2 shows the operation of a hemming tool for hemming a workpiece. FIG. 3 shows a state of a workpiece to be hemmed by a hemming tool.

  The workpiece W2 is assumed to be bent in an L shape as shown in FIG. A member to be bonded W2 is stacked on the bottom surface of the member to be processed W1, and is bent as shown in FIG.

  As shown in FIG. 2 (A), the portion of the workpiece W1 standing in the vertical direction faces the back of the drawing (the bottom surface and the bonded member W2 are in front of the drawing), and the lower surface of the workpiece W1 is the locking surface 12a. The workpiece W1, the workpiece W2 are locked by the locking portion 10, and the hemming tool 1 is pulled in the reverse direction (in the direction of the black arrow), so that the workpiece W1, the workpiece W2 is engaged. Is inserted between the locking portion 10 and the processed portion 20.

  The workpiece W1 is bent in the direction shown by the arrow in FIG. 3B from the state shown in FIG. 3B toward the state shown in FIG. At that time, the first curved surface 23a of the sliding portion 23 is gradually applied without being suddenly applied. (As in Non-Patent Document 1, the first curved surface 23a having a corner has a sharp bending force.)

  As the sliding portion 23 slides (reciprocates), the processed portion 20 rotates in the direction of the arrow as shown in FIG. 2B, and the clamping portion 24 approaches the locking surface 12a. As a result, the workpiece W1 bent by the sliding portion 23 is clamped between the locking portion 10 and the locking surface 12a by the clamping portion 24, as shown in FIG. Is flattened. At that time, the second curved surface 24a of the pinching portion 24 gradually increases the pinching pressure without being suddenly applied. (As in Non-Patent Document 1, there is no second curved surface 24a and a narrow pressure is applied on a flat surface.

  The housing 31 is gripped and the hemming tool is moved along the edge of the member W2 to be joined (to the right in FIG. 2). Thus, the joined workpiece W1 and the joined member W2 are formed on the spatula portion 25 side (toward the left in FIG. 2), and the unjoined workpiece W1 and the joined member W2 are slidable portions. 23 is inserted from the side of 23 (the right side in FIG. 2). Thereby, hemming can be performed over the entire edge of the member W2 to be joined.

  As described above, since the bending force and the clamping pressure are gradually increased without being suddenly applied, the workpiece W1 is less likely to be locally deformed. That is, there are few undulations.

  According to the applicant's experiment, by the processing portion 20 (the shape of the first curved surface 23a and the second curved surface 24a and the arrangement thereof) of the shape of the present embodiment, the undulation is less than that of the non-patent document 1, Hemming could be performed efficiently.

  As described above in detail, the hemming tool 1 of the present embodiment is centered on the locking portion 10 having the locking surface 12a for locking the workpiece and the central axis L parallel to the locking surface 12a. Slidable part 23 that slides and bends the workpiece that is locked by the locking part 10, and a clamping part 24 that clamps and flattenes the workpiece between the locking part 10 and the sliding part 23. The processing part 20 which has these is provided. The processed portion 20 rotates around a central axis L parallel to the locking surface 12a, and the workpiece to be processed locked by the locking portion 10 is slid by the sliding portion 23 of the processed portion 20. The workpiece to be processed is clamped and flattened between the locking portion 10 and the workpiece to be bent by the sliding portion 23 by the clamping portion 24 of the processing portion 20. Hemming can be performed without undulation or with small undulation.

  A hemming tool for hemming a plate-like workpiece, which can be thinly processed, is expected to be used by many automobile maintenance shops and the like.

DESCRIPTION OF SYMBOLS 1 Hemming tool 10 Locking part 11 Locking base 11a Fixing part 11b Locking part 12 Nylon sheet 12a Locking surface 20 Processing part 21 Flat stand 22 Hammer 23 Sliding part 23a First curved surface 24 Clamping part 24a Second curved surface 25 Spatula Part 30 Power unit 31 Housing L Center axis W1 Workpiece member W2 Joined member

Claims (4)

A hemming tool for hemming a plate-shaped workpiece,
A locking portion having a locking surface for locking the workpiece,
Rotating about a central axis parallel to the locking surface, and a sliding part that slides and bends the workpiece locked by the locking part, and the locking part A clamping part that clamps and flattenes the workpiece to be processed,
The sliding portion has a first curved surface 23a that is substantially arc-shaped when viewed in a direction parallel to the central axis, and the clamping portion is a second curved surface that protrudes outward from the first curved surface with respect to the central axis. A hemming tool characterized by comprising:   The hemming tool according to claim 1, wherein a minimum separation distance between the second curved surface and the locking surface is 2 mm or less. The first curved surface has a radius of curvature of 18 to 22 mm;
The second curved surface has a radius of curvature of 9 to 11 mm;
The hemming tool according to claim 1 or 2, wherein a distance of the second curved surface projecting outward from the first curved surface is 2 to 4 mm.   The clamping portion and the sliding portion are respectively provided in a forward direction and a reverse direction in which the workpiece is inserted between the locking portion and the processing portion with respect to the central axis. The hemming tool according to any one of claims 1 to 3.