JPH02179324A - Hemming method and its device - Google Patents

Abstract

PURPOSE:To perform a hemming work with one working device by holding a body part with a body part holding means while the edge part of a plate-like material to be worked is projected, holding a projected edge with an edge holding means and putting the edge holding means in a circular motion. CONSTITUTION:The plate-like material 30 to be worked is clamped by operating a cylinder 10 between an upper die 9 and a lower die 8. The cylinder 16 is operated to clamp the material between an upper 13 and a lower die 12 to form a folded part 31b. When a pin 22 is rotated and a support member 21 is turned, the whole moving part 15 makes a circular motion, an edge holding means 11 turns into the lower part of a body holding means 7, the slope 13b of the upper surface of the upper die 13 and the slope 8a of the bottom of the lower die 8 come in contact with each other to form the folded part 31a'. Cylinders 17, 27 are driven to move the dies 13, 8 and when the die 12 continues the circular motion the front body 31a' of the folded body comes in contact with the rear 30a of the material 30 to be worked to complete the hemming work.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hemming method and an apparatus therefor, and in particular, forms a double folded portion at the edge of a plate-shaped workpiece by a series of movements. The present invention relates to a hemming method and an apparatus therefor.

[Prior Art] Hemming refers to the process of bending or folding the edges of parts. FIG. 4 shows a product manufactured using hemmed parts.

FIG. 4 is an external perspective view showing an example of a microwave oven. The microwave oven 1 consists of a main body 2 and a door 3. The main body 2 includes an inner box 4 and an outer frame 20. As shown in the schematic perspective view of FIG. 5 and FIG. 6 (a sectional view taken along the line Vl-Vl in FIG. 5), the inner box 4 includes a front plate 5, a body part 6, and a rear plate (not shown). ). A rear projecting portion 5a is provided at the periphery of the front plate 5 and extends toward the rear.

Next, a connection structure between the outer frame 20 and the inner box 4 will be explained. FIG. 7 is a sectional view of the connection structure between the outer frame 20 and the inner box 4.

The edge of the outer frame 20 has a double folded structure, and is formed by folding a first folded part 21a facing inward and further folding the edge of the first folded part 21a inward. It includes a second folded portion 21b.

The connection between the outer frame 20 and the inner box 4 is achieved by connecting the rear protrusion 5a provided at the periphery of the front plate 5 to the space formed by the first folded part 21a and the second folded part 21b. This is achieved by fitting. Such a connection is easier to operate than a connection made by welding or the like, and is applied not only to the above-mentioned microwave oven but also to other electrical products, mechanical products, etc. in a wide range of fields.

Next, two
A conventional hemming method for forming a double folded portion will be explained.

FIGS. 8A to 8G are cross-sectional views of conventional hemming processing. In particular, FIG. 8G shows a cross-sectional view of the final finished product.

Referring to FIG. 8G, the end of the plate-shaped workpiece 30 has a double folded structure, with a first folded part 31a folded back facing inward and a first folded part 31a folded back. It includes a second folded portion 31b formed by further folding back the edge.

Next, the steps up to the final finished product shown in FIG. 8G will be explained with reference to FIGS. 8A to 8F.

With reference to FIG. 8A, the plate-shaped workpiece 30 is prepared, and then with reference to FIGS. 8B and 8G, the plate-shaped workpiece 30 is prepared.
The edge is bent in the outward direction A to form a second folded part precursor 31b' which will become the second folded part 31b. At this time,
The end portion of the second folded portion precursor 31b' is slightly bent in the forward direction B.

Next, referring to FIG. 8C, the second folded portion precursor 31
Slightly tilt b' in the backward direction C.

Next, with reference to FIG. 8C, FIG. 8D, and FIG. 8G, when the second folded portion precursor 31b' is further tilted rearward and brought close to the surface 30a of the plate-shaped workpiece, Second
A folded portion 31b is formed.

Next, with reference to FIGS. 8E and 8G, a portion of the edge of the plate-shaped workpiece 30 located further back is bent inward to form a first folded portion 31a. 1 folded portion precursor 318' is formed.

Next, referring to FIG. 8F, the first folded portion precursor 31
Slightly tilt a' in the backward direction C.

Next, referring to FIG. 8G, the first folded portion precursor 31
Tilt a' further toward the rear direction C, and the back surface 3 of the plate-shaped workpiece is
0b, a first folded portion 31a is formed.

[Problem to be Solved by the Invention] The conventional hemming process is configured as described above. For example, the steps shown in FIGS. 8A to 8E are performed with one device, and the steps shown in FIGS. 8F to 8G are performed. Processes have to be carried out using separate devices, and processing cannot be completed with one processing device. This made the operation complicated.

This invention was made to solve the above-mentioned problems, and it is possible to form a double folded part on the edge of a plate-shaped workpiece in one process with one processing device, and the processing operation is easy. An object of the present invention is to provide a hemming method and device that facilitates hemming.

[Means for Solving the Problems] In order to achieve the above object, the hemming device of the present invention for forming a double folded portion on the edge of a plate-shaped workpiece is provided with body part gripping means for gripping the main body part of the plate-shaped workpiece in a state in which the edge of the workpiece is protruded; an edge gripping means for gripping an edge of a plate-shaped workpiece; a drive means for moving the edge gripping means in an arc around the gripping point; and posture maintaining means for maintaining the gripping posture of the edge gripping means with respect to the object in a constant state.

As a hemming method for forming a double folded part on the edge of a plate-shaped workpiece, the main body of the plate-shaped workpiece is a step of gripping an edge of the plate-shaped workpiece at a position separated from a gripping point at which the plate-shaped workpiece is gripped; There is a method comprising the step of moving the edge of the plate-shaped workpiece in an arc around the gripping point while maintaining the gripping posture of the edge in a constant state.

[Operations and Effects of the Invention] According to the hemming method according to the present invention, the main body of the plate-shaped workpiece is held in a state in which the edges of the plate-shaped workpiece are protruded; The edge of the plate-shaped workpiece is gripped at a position separated from the gripping point where the workpiece is gripped. Then, while maintaining the gripping posture of the edge of the plate-shaped workpiece in a constant state, the edge of the plate-shaped workpiece is moved in an arc around the gripping point, and the edge of the plate-shaped workpiece is A double fold is formed at the edge of the workpiece. Since these steps can be achieved through a series of movements, the processing is completed in -step.

As a result, processing operations become easier.

Further, according to the hemming device according to the present invention, it is possible to grip the main body of the plate-shaped workpiece in a state in which the edge of the plate-shaped workpiece is protruded; The edge of the plate-shaped workpiece can be gripped at a position spaced apart from the gripping point being gripped.

Then, while maintaining the gripping posture of the edge of the plate-shaped workpiece in a constant state, the edge of the plate-shaped workpiece is moved in an arc around the gripping point, so that the edge of the plate-shaped workpiece is moved in an arc. A double fold can be formed at the edge of the workpiece. Since these steps are configured to be accomplished through a series of movements, the hemming process is completed in the -step. As a result, only one processing device is required.

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1H is a cross-sectional view of the final finished product produced by the hemming process according to the present invention.

Referring to FIG. 1H, the end of the plate-shaped workpiece 30 has a double folded structure, with a first folded part 31a folded inward and a first folded part 31a folded back. It includes a second folded portion 31b formed by further folding back the edge. Next, an apparatus and method according to the present invention for forming this double folded structure will be explained.

FIG. 1A is a conceptual diagram of an apparatus for realizing the hemming process according to the present invention. The device consists of a fixed part 14 and a moving part 15. In the figure, 30 is a plate-shaped workpiece.

The fixing part 14 includes a main body gripping means 7 that grips the main body of the plate-like workpiece 30 with the edge portion 30c of the plate-like workpiece 30 protruding. The main body gripping means 7 includes a first lower mold 8 that supports the plate-shaped workpiece 30 from below, and a first upper mold 9 that presses the plate-shaped workpiece 30 from above.

A slope 8a is formed on the bottom surface of the first lower mold 8,
The shape of this slope 8a is selected so as not to impede the arcuate motion of the lower mold 12 in FIG.

The first upper mold 9 can be moved up and down by a cylinder 10 fixed to the device main body 40.

The first lower mold 8 is movable in the piston movement direction by a cylinder 27.

The moving unit 15 is located at a position apart from a gripping point 26 (a point where the protruding edge portion 30c is not moved) by the main body gripping means 7 on the plate-shaped workpiece 30, and holds the plate-shaped workpiece 30. An edge gripping means 11 is provided for gripping an edge 30d of the edge.

The edge gripping means 11 grips the edge 30 of the plate-shaped workpiece 30.
The second lower mold 12 that supports d from below and the edge edge 30d
A second upper mold 13 is provided for pressing from above. Predetermined molds are formed on the bottom surface 13a of the second upper mold 13 and the upper surface of the second lower mold 12.

The shape of this mold is such that the bottom surface 13a of the second upper mold 13 and the second
When the edge edge 30d is sandwiched between the upper surface of the lower mold 12,
The shape is selected so that the shape of the second folded portion 31b (see FIG. 1H) is formed.

Further, a slope 13b is also formed on the upper surface of the second upper mold 13. The shape and dimensions of the slope 13b are the same as those of the first folded portion 3.
It is chosen so that the edges of 1a can be folded further inward (see Figure 1H). The second upper mold 13 is moved up and down by a cylinder 16 rotatably attached to the moving part 15, and is moved up and down by a cylinder 17 rotatably attached to the moving part 15. Move in the direction of 18 (
(including reciprocating movements).

The moving part 15 is provided with a bin 19, and one end of a support member 21 is rotatably attached to the bin 19. The other end of the support member 21 is connected and fixed to a bin 22 which is rotated by the rotational force of a motor (not shown). The bin 22 is placed on a line passing through the gripping point 26 and perpendicular to the plane of the paper. The function of the support member 21 is as follows. That is, when the bin 22 rotates due to rotation of the motor, the support member 21 rotates around the bin 22. When the support member 21 rotates, the bin 19 moves in an arc around the bin 22, and as a result, the movable member 15 also moves in an arc. A long hole 23 is provided along the arc movement of the bottle 19. This elongated hole 23 is not necessarily necessary if the support member 21 is made of a durable material.

Another bin 24 is provided on the movable member 15 at a position apart from the bin 19. In order to guide the bottle 24, a long hole 2 similar to the long hole 23 is moved in parallel.
5 is provided in the device. Such a long hole 25
The reason for providing this is to maintain the gripping posture of the edge gripping means 11 with respect to the plate-shaped workpiece 30 in a constant state when the moving member 15 moves in an arc.

Next, with reference to FIGS. 1A to 1H, a method for forming a double folded portion at the edge of a plate-shaped workpiece using this hemming processing apparatus will be described.

Referring to FIG. 1A, the main body portion of the plate-shaped workpiece 30 is
The edge edge 3 of the plate-shaped workpiece 30 is placed on the lower mold 8.
0d is placed on the second lower mold 12.

Next, referring to FIG. 1A and FIG. 1B, cylinder 1
0 is activated to push down the first upper mold 9, and the main body of the plate-shaped workpiece 30 is strongly sandwiched between the first upper mold 9 and the first lower mold 8. On the other hand, the cylinder 16 is operated to push down the second upper mold 13, and the edge 30d of the plate-shaped workpiece 30 is strongly pressed between the second upper mold 13 and the second lower mold 12. Pincer. At this time, the molds formed on the bottom surface of the second upper mold and the upper surface of the second lower mold form a second folded portion 31b (first
(see figure) is formed. This state is abbreviated in FIG. 1C. In FIGS. 1C to 1H, only the movement of the mold is shown in order to simplify the drawings.

Next, referring to FIG. 1D (also refer to FIG. 1B),
A motor (not shown) is driven to rotate the bin 22 and rotate the support member 21 around the bin 22. Then, the bottle 19 moves in an arc along the elongated hole 23, and the moving part 1
5 moves in an arc along the elongated hole 23. As a result, the edge gripping means 11 moves in an arc around the gripping point 26. During this arcuate movement, since the elongated holes 25 and 23 are provided in parallel, the gripping posture of the edge gripping means 11 with respect to the plate-shaped workpiece 30 is maintained in a constant state due to the action of the elongated holes 25. Ru.

Next, referring to FIGS. 1D and 1E, when the edge gripping means 11 is further moved in an arc, a state in which the edge gripping means 11 wraps around below the main body gripping means 7 is realized. At this time, a portion 34 (see FIG. 1D), which is an edge portion of the plate-shaped workpiece 30 and is located between the gripping point 26 of the main body portion gripping means 7 and the gripping point 33 of the edge gripping means 11, is The slanted surface 13b formed on the upper surface of the second upper mold 13 and the slanted surface 8a formed on the bottom surface of the first lower mold 8 contact, and become the first folded part 31a (see FIG. 1H). One folded portion precursor 31a' is formed. When this condition occurs, the first
Referring to Figure F (also refer to Figure 1B), cylinder 1
7 to move the second upper mold 13 in the direction of arrow 28, and at the same time drive the cylinder 27 to move the first lower mold 8 in the direction of arrow 29 to release them from the processing position. .

Next, referring to FIG. 1G, when the arcuate movement of the second lower mold 12 is continued, the second lower mold 12 and the first upper mold 9 face each other, and the first folded part is formed. The precursor 31a contacts the back surface 30a of the plate-shaped workpiece 30.

Next, when the plate-shaped workpiece 30 is taken out of the apparatus, a plate-shaped workpiece with a double folded portion formed at the edge as shown in FIG. 1H is formed.

As described above, in this embodiment, the formation of the double folded portion can be achieved through a series of seamless movements, which facilitates the processing operation.

In the above embodiment, as a means for moving the edge gripping means in an arc around the gripping point, with reference to FIG. 1A,
Although a driving means including a motor (not shown), a support member 21, and a long hole 23 is illustrated, the present invention is not limited thereto. Even if a cylinder 35 is attached to the moving part 15 instead of 21 and the moving part 15 is moved along the elongated hole 23 and the elongated hole 25 by the cylinder 35, the same effect as in the above embodiment can be achieved.

Further, in the above embodiment, the elongated hole 23 and the elongated hole 23 are used as posture maintaining means for maintaining the gripping posture of the edge gripping means 11 with respect to the plate-shaped workpiece in a constant state when the moving part 15 moves in an arc. The case where the hole 25 is provided is illustrated. However, the invention is not limited to this. That is,
Referring to FIG. 3, instead of providing a long hole, the moving part 15
One end of the support member 21.21' of the same length is rotatably attached to each of the pins 19 and 24 attached to the pin 22.22'.
This pin 22.22' is connected to and fixed to the support member 21.22'.
21' are arranged so that they are parallel to each other. The pins 22 and 22' are rotated at the same speed by a motor or the like, and the support members 21 and 21' are rotated at the same speed.

Even with such a configuration, the same effects as in the embodiment can be achieved.

This invention has been described above with reference to specific examples, but
The preferred embodiments described herein are illustrative and not restrictive. The scope of the present invention is indicated by the claims, and all modifications that come within the meaning of the claims are intended to be included in the present invention.

[Brief explanation of the drawing]

FIG. 1A is a conceptual diagram of a hemming device for realizing the present invention. 1B to 1H are diagrams showing a method of hemming a plate-shaped workpiece using the hemming apparatus shown in FIG. 1A. FIG. 2 is a conceptual diagram of another embodiment of the hemming processing apparatus according to the present invention. FIG. 3 is a conceptual diagram of still another embodiment of the hemming processing apparatus according to the present invention. FIG. 4 is a perspective view of the microwave oven. FIG. 5 is a perspective view of the inner box of the microwave oven. FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 5. FIG. 7 is a sectional view of the connection structure between the outer frame and the inner box of the microwave oven. FIGS. 8A to 8G are cross-sectional views showing the conventional hemming process. In the figure, 7 is a main body gripping means, 8 is a first lower mold,
9 is a first upper mold, 11 is an edge gripping means, 12 is a second lower mold, 13 is a second upper mold, 19 is a pin, 21 is a support member, 22 is a pin, and 23 is a long 26 is a gripping point, 30 is a plate-shaped workpiece, 30c is an edge portion, 31a is a first folded portion, and 31b is a second folded portion. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1q Figure 31 Mountain ζ 3To: Tsuta 1, fold J and own P, 1 #1 fold and include Figure 3 Figure welfare

Claims (2)

[Claims] (1) A hemming device for forming a double folded portion on the edge of a plate-shaped workpiece, the hemming device being capable of forming a double-folded part on the edge of a plate-shaped workpiece, the hemming device body part gripping means for gripping the body part of the plate-shaped workpiece; and edge gripping means for gripping an edge of the plate-shaped workpiece at a position separated from a gripping point of the body part gripping means on the plate-shaped workpiece. means, a drive means for moving the edge gripping means in an arc around the gripping point, and a state in which the gripping posture of the edge gripping means with respect to the plate-shaped workpiece is kept constant during the arcuate movement. A hemming processing device comprising: a posture maintaining means for maintaining the posture; and a hemming processing device. (2) A hemming method for forming a double folded portion on the edge of a plate-shaped workpiece, the hemming method comprising: a step of gripping the main body of the plate-like workpiece, and a step of gripping an edge of the plate-like workpiece at a position separated from a gripping point at which the plate-like workpiece is gripped; A hemming method comprising the step of moving the edge of the plate-shaped workpiece in an arc around the gripping point while maintaining the gripping posture of the edge of the object in a constant state.