JPH0237256B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of improving the yield rate when molding a ring material.

The invention of this application is a ring material bending press method in which a plate-shaped work material cut in advance to a predetermined size is formed into an L-shaped cross section by bending in the lateral and longitudinal directions, and a bending press method for a ring material. This invention relates to a device that is directly used in a method, and in particular, the plate-shaped workpiece material set in the side setter of a cylindrical die that is provided on a frame and forms a single plate-shaped workpiece into a cylindrical shape is transferred to a ram mechanism. U-bending is performed by one of a pair of lateral press dies that is engaged with an attached cam mechanism, and then the U-bend opening is formed from the opposite direction along the circumferential side of the fixed die by the other lateral press die. The plate-shaped work material is bent and formed into a ring shape, and then the upper side of the ring material is pressed and bent by a vertical press die attached to the ram mechanism, and finally welded. This invention relates to a bending press method for ring material and a device directly used in the method.

<Prior art> As is well known, conventionally, a ring material having an L-shaped cross section is formed by punching and pressing a developed shape material of a work material 2 formed into a ring shape from a steel plate 1 of a fixed length, as shown in FIGS. 1a to 1d. The center part 3 is punched out by
A method has been devised and adopted in which the outer circumferential portion 4 is punched out to take the material, and then the circumferential edge 2' of the workpiece material 2 is made to stand upright by drawing.

<Problems to be Solved by the Invention> However, the central part 3 and the outer peripheral part 4, which are treated as scrap when taking the above-mentioned materials,
After punching out multiple pieces, the fixed-length steel plate 1 becomes the workpiece material 2.
This corresponds to 60 to 70% of the amount taken out, resulting in poor yields and a high ratio of material costs to product costs.

In addition, in the punching press process, at least 2
A seed punching die is required, and therefore a high degree of dimensional accuracy is required for centering the center part 3 and the outer peripheral part 4.
Furthermore, in the drawing process, it is difficult to expose the reference surface of the workpiece material 2, so that it is difficult to set the drawing die relative to the peripheral edge 2'.

Furthermore, since multiple steps are required for processing, quality control throughout the multiple steps is not only important, but also molds must be manufactured individually for each step, so There was also the disadvantage that the depreciation costs for the molds increased, resulting in an increase in product costs.

The purpose of the invention of this application is to provide a method for forming a ring material having an L-shaped cross section based on the above-mentioned prior art, and to solve the problems of manufacturing the same, by shearing a workpiece material from a fixed length steel plate into a plate shape. By making the plate-shaped workpiece material undergo one continuous process from U-bending to ring-forming and L-bending the upper side, the yield rate of the material is 100%, making it suitable for use in processing technology in the machine manufacturing industry. An excellent ring material bending press method that benefits
The present invention also aims to provide an apparatus that can be used directly in the method.

<Means for solving the problem> In order to solve the above-mentioned problem, a plate-shaped work material is set in the setter of a fixed die. This is a bending press method for a ring material in which lateral pressing and then vertical pressing are performed as the ram descends.The single plate-shaped work material is set horizontally in an upright position, and the plate-like work material is set horizontally in an initial shape. Bending of a ring material that is press-formed, then laterally press-formed from the opposite direction into a ring shape, then vertically press-formed around the entire upper side of the workpiece into an L-shaped cross section, and finally welded. A pressing method and a ring material bending press device mounted on a frame on a base, wherein the frame is provided with a cylindrical die for cylindrical forming of a plate-shaped workpiece, and the cylindrical die is A ram mechanism having a vertical press die at the top is provided with cam mechanisms on both sides so that it can be raised and lowered, and the cylindrical workpiece is engaged with the cam mechanism to be slidable relative to the cylindrical die. This is a bending press device for a ring material having an L-shaped cross section, in which a plurality of lateral press dies for forming are capable of being separated from each other on the surface of the periphery of a cylindrical die.

<Function> The workpiece material, which has been shaped into a plate in advance, is set upright on the side of the cylindrical die, and then the workpiece material is pressed onto the curved side surface of the cylindrical die using the rear lateral press die. U-bend along the
Furthermore, the bending opening of the work material is bent along the side curved surface of the cylindrical die using another immediate press die from the opposite direction to form the work material into a ring shape, and then the ring-shaped work material is The upper side is bent horizontally by sliding the directional press die to form a ring material with an L-shaped cross section.
Technical measures have been taken to weld it afterwards.

<Example> Next, an example of the invention of this application will be described below based on the drawings.

Reference numeral 5 denotes a bending press device, which constitutes one of the gist of the invention of this application, and as shown in FIG. 2c, a cylindrical die 8 is placed on a frame 7 on a base 6 via a lifter 9. At the same time, a pair of lateral press dies 10 and 11 are provided on the upper surface of the frame 7, and as shown in FIG.
It has curved parts 13 and 14 that follow the side curved surface 12 of
Cam receivers 15 and 16 are attached to the back and are set so as to be releasable from the side curved surface 12 of the cylindrical die 8.

Further, a work setter 17 for the plate-shaped work material w is provided on the side curved surface 12 of the cylindrical die 8 on the side press die 10 side, and a work setter 17 for the plate-like work material w is provided on the side curved surface 12 of the cylindrical die 8 on the side press die 10 side. The integral engagement with the die 8 covers the entire circumference of the lateral curved surface 12, and taper guides 18 are formed at both ends of the inner curved portion 14 of the lateral press die 11.

On the other hand, a vertical press die 19 is located above the cylindrical die 8 and is vertically installed on a press plate 20 forming a ram mechanism that can move up and down.
Preliminary dies 22, 22 are attached to the heads 28 of the urethane arms 21, 21, which are provided around the periphery of the press plate 20 and are vertically disposed on the press plate 20.
23 and is fixedly installed so as to surround the vertical press die 19, and the tapered portions 23, 2
3 is slightly exposed from the tip of the vertical press die 19 and can be pressed freely close to the edge 8' of the cylindrical die 8, as shown in FIG.

Sleeves 24 and 25 as cam mechanisms are vertically disposed on both sides of the pressing plate 20 and have tapered portions 26 and 27 inside, respectively.
5 and 16 can be freely engaged with each other.

Thus, the engagement between the tapered portion 27 and the cam receiver 16 follows the engagement between the other tapered portion 26 and the other cam receiver 15, and the preliminary dies 22, 22 are Sleeves 24, 25 and cam receiver 1
5 and 16, it comes into contact with the cylindrical die 8.

In the above configuration, as shown in Fig. 3a, the work material w, which has been sheared in advance, is set in a predetermined posture as shown in Fig. 2a. When the press plate 20 is lowered after the workpiece setter 17 is set horizontally in a predetermined position, the tapered part 26 of the sleeve 24 engages with the cam receiver 15 provided on the lateral press die 10, and the lateral press die 10 is moved. 10 in the direction of the cylindrical die 8, and the workpiece material w is placed on the side curved surface 1 of the cylindrical die 8.
2 is brought into contact with and curved by the curved portion 13 of the lateral press die, thereby plastically deforming the workpiece material w into the shape of the workpiece w', as shown in FIG. 3b.

Next, as shown in FIG. 2b, the other sleeve 2
5 engages with a cam receiver 16 provided on another lateral press die 11, and slides the lateral press die 11 onto the cylindrical die 8 from the direction opposite to the lateral press die 10, thereby forming a shaped workpiece.
As shown in FIG.
to the side curved surface 12 of the cylindrical die 8,
By bending and deforming the ring material as shown in Figure 3c.
While forming the ring material w'', the ring material w'' is clamped and fixed between the cylindrical die 8 and the lateral press dies 10 and 11.

After that, the preliminary dies 22, 2 above the cylindrical die 8
The tapered parts 23, 23 of the ring material W'' are hooked around the entire upper side of the ring material w'' to the edge 8' of the cylindrical die 8, and are tilted and deformed inward, resulting in inward squeezing of the upper side as shown in Fig. 3d. A vertical press die 19 that preforms the ring material w'' and descends the upper inward pinching part.
is pressed by a cylindrical die 8 to deform it, and press-formed to complete a ring material w'''' having an L-shaped cross section as shown in FIG. 3e.

During this time, when the pressing plate 20 is lowered, the preliminary dies 22, 22 always elastically press the edges of the ring material w by the heads 28, 28 of the urethane arms 21, 21. bulges laterally according to the

When the above-mentioned process is completed, the press plate 20 is raised, the preliminary dies 22, 22 are separated from the ring material w'''' following the vertical press die 19, and the arm 21 is elastically returned, and then, sleeve 2
4, 25 rises, the lateral press dies 10, 1
1 removes the ring material w using an appropriate slide back device.
At the same time as the bending press device 5 returns to its initial position, the lifter 9 raises the cylindrical die 8 to make it easier to take out the ring material w''''. Return to the predetermined posture and complete one process.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments. For example, the upper side of the ring material is bent outward using a preliminary die and a vertical press die to form a flange. Various aspects can be adopted, such as forming the

<Effects of the Invention> As described above, according to the invention of this application, in the ring material bending press method and the device directly used in the method, the workpiece material forming the ring material has a rectangular shape. Since the workpiece material facilitates the setting of a two-dimensional reference surface from a standard-length steel plate, accurate dimensional accuracy is guaranteed, and since the workpiece material is uniquely rectangular, the yield rate for a standard-length steel plate is 100%. %, therefore, the ratio of material costs to the product can be significantly reduced, resulting in an excellent effect of reducing costs.

In addition, since the work material placed upright in the bending press is bent in the lateral direction and then in the longitudinal direction, the elongation direction due to the bending process is unique. It is possible to easily determine the growth rate of
The excellent effect of reducing the variance of manufacturing dimensional errors in lot manufacturing, reducing the product defect rate, and also requiring quality control only by guaranteeing the dimensions of the workpiece material is achieved.

Furthermore, since the vertical press die and the lateral press die required to form a ring on the workpiece material operate dynamically in succession during the lowering process of the ram mechanism, the workpiece material can be U-bended, ring-formed, and finally cross-sectionally L-bended. All of this is done in one step. Therefore, not only is there no need for mold adjustment after the workpiece material is set in the bending press device, but the number of processing steps can also be reduced. An excellent effect is achieved in that product costs can be reduced.

Furthermore, since there is no need to perform any welding on a single plate-shaped workpiece material until the ring material with an L-shaped cross section is formed, it has the effect of having elasticity that allows it to be used in a workpiece posture without welding. Furthermore, there is also the advantage that there is no need to carry out welding to the end.

In addition, since the longitudinal press die and the lateral press die press the workpiece material with a uniformly distributed load, there is an advantage that mold wear of both dies is reduced and the service life can be extended.

[Brief explanation of drawings]

Figures 1a to 1d are partial plan views of the ring material forming process based on the prior art, and Figures 2 and below show one embodiment of the invention of this application, and Figures 2a, 2b, 2
Fig. 3c is a sectional view of the operating process, Figs. 3a to 3e are perspective views of the process of molding the ring material, Fig. 4 is a plan view of the forming part, and Fig. 5 is an enlarged sectional view of part A in Fig. 2c. 8... Fixed die, 17... Setta, 2, w...
...Work material, w'...U-shaped work, w''...Ring material, 6...Base, 7...Frame, w, w
''''... Ring material, 5... Bending press device, 8... Cylindrical die, 19... Vertical press die, 20... Ram mechanism, 24, 25... Cam mechanism, 10, 11... Lateral press die.

Claims (1)

[Scope of Claims] 1. A ring material bending press method in which a plate-shaped work material is set in a setter of a fixed die, and as the ram descends, lateral pressing and then vertical pressing are performed. Two plate-shaped workpieces are set vertically in a horizontal direction, and are laterally press-formed into an initial shape, then laterally press-formed from the opposite direction into a ring shape, and then longitudinally press-formed on the entire upper side of the workpiece. A bending press method for a ring material, characterized in that the bending press is performed in an L-shape and welded at the end. 2. In a ring material bending press device mounted on a frame on a base, a cylindrical die for cylindrical forming of a plate-shaped workpiece is provided on the frame, and a vertical press is installed above the cylindrical die. A ram mechanism having a die is provided with a cam mechanism on both sides so that it can be raised and lowered freely, and a plurality of ram mechanisms for cylindrical forming of a workpiece are engaged with the cam mechanism and can be slid with respect to the cylindrical die. A bending press device for a ring material having an L-shaped cross section, characterized in that a lateral press die is capable of being separated from the surface of the periphery of a cylindrical die.