JP2010201503A - Method, structure and device for bending square pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that gaps are generated between the joined surfaces, general welding technique can not be adapted and the result is not good in a square pipe bending means of a conventional technique which is possible by leaving one side and cutting rest three sides in the bending means of the square pipe composed of four sides. <P>SOLUTION: By leaving the one side, initially, cutting the side which is opposite (face) to the one side to be left and, next, cutting two remaining sides from the inside of the pipe toward the outside, excellent bending and joining are made possible by forming burrs on the outside of the pipe. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a hollow square iron and iron alloy consisting of four sides, copper and copper alloy, aluminum and aluminum alloy pipes such as aluminum alloy, etc., per bending, leaving one side without cutting, and cutting the remaining three sides, The present invention relates to a means for bending a square pipe, which is used as a store member for product display, which is configured in the necessary number and direction of bending portions and is bent, welded, and finished.

  Most of the square pipes used as store members for displaying merchandise are generally hollow square pipes with four sides with a thickness of about 1 mm to 3 mm on a side. Normally, a square with a side of about 10 mm is used. A square pipe having a side of about 100 mm from a rectangular pipe having a large size on two sides and a rectangular pipe having various sizes in a rectangular shape having two sides changed are employed.

  Square pipes used as store components for product display are usually made of iron materials such as low carbon steel and high carbon steel, special iron alloys such as stainless steel, copper alloys such as brass, and aluminum alloys. Square and rectangular pipes of various sizes are produced and marketed.

  In the industry, the above-mentioned square pipes are bent into a predetermined shape, and the required holes for attaching jigs are drilled and cut to create a model for store display for merchandise display. The finish has been accomplished.

  In general, due to the large number of small lot production, the bending process is performed by cutting and separating the pipes at a predetermined angle, carefully aligning them, fixing them with a predetermined jig, and then joining them by welding. Needless to say, making bent products is not a reasonable method, but it has a high defect rate such as joint deformation, requires delicate skill, and has a poor finish. However, when used as a store member for product display, such as the strength of the joint is insufficient, there are many safety problems such as dropping or injury at the edge.

  In order to solve the above-mentioned problems, the present inventor has conducted earnest research and has developed a means based on an extremely useful technical idea, which will be described later, and has considered patent applications. The following prior art was found.

  Patent Application Notice Sho 55-50737   Patent Application Publication Sho 63-199029   Published patent application 08-309430   Patent Application Publication Hei 11-300422

  The patent application publication (Sho 55-50737) of Patent Document 1 summarizes a wave-shaped blade edge upper mold having a rounded tip and a lower mold formed with a groove for guiding the upper mold. Used to press-cut the bent part of the square pipe, leaving one side of the square pipe as a fulcrum so that the square pipe can be bent accurately, for example, to make a U-shaped product It is disclosed that bending can be accurately performed by bending a square pipe.

  However, according to the reference of this Patent Document 1, the corrugated upper mold moves in the vertical direction on one side of the square pipe to be left, so that the pipe inner side wall surface on one side of the square pipe to be left is cut. The thickness of the pipe at the location will decrease (see the reference Fig. 1 b), and the possibility of insufficient strength during use cannot be denied. In addition, the corrugated upper die is cut from the outside of the hollow rectangular pipe by applying a force that explains the principle of the wedge, but the pipe is crushed in the pressing direction anyway. Inevitable deformation. In addition, a particularly problematic point is that the side of the square pipe that becomes the notch at the bent part where the corrugated upper die first contacts is deformed in the direction of the pipe, and the generated burr is in the direction of the pipe inner surface. It is.

  When deformation occurs in the pipe inner surface direction and a recess toward the inside of the pipe is formed on the outer surface portion of the pipe and the burr is in the inner surface direction, not only a very difficult technique is required for welding such as electric welding. The surface of the welded finish is poor and the strength is inadequate. In addition, it tends to have a poor appearance even in polishing work performed for beautifying finishes such as post-processing painting and plating. Defects such as painting and plating in the subsequent process are likely to occur. Further, in the drawing of Patent Document 1 (see FIG. 1B), since there is a burr-incision gap at the inner corners (B, B ′) of the bent pipe, it cannot be welded, the finish is poor, the strength is insufficient, etc. Therefore, it was not preferable.

  The patent application publication (Sho 63-199029) of Patent Document 2 is, in summary, an improvement of the above-described corrugated upper mold of Patent Document 1 and comprises an R portion and a linear blade portion on the blade edge. In addition, the steps are partially configured, and there is no significant difference from the above-mentioned reference (Patent Document 1) with respect to the operational effects, and there is no clear explanation about the steps formed in part. Therefore, if it guesses, it will be judged that it is comprised in order to comprise the incision junction part B shown by FIG. 3 (b) of patent document 2 of reference. Therefore, the problem with this reference is an unfavorable problem with the same contents as in Patent Document 1.

  The patent application publication (Patent Document 08-309430) of Patent Document 3 is summarized as follows. In Patent Document 1 and Patent Document 2, a gap (part a in FIG. 6) is generated after a square pipe is bent. This is a hollow square pipe bending method improved so as not to form a gap because a welding means cannot be introduced, and its processing mold.

  According to the reference invention, the upper mold edge has an overall structure similar to that of Patent Document 2, and assuming a center line from the tip of the blade edge, an angular difference (for example, refer to FIG. 4 in the reference) is given, At the time of bending joining, as shown in FIG. 4C, a part of the ridge shape of the upper mold is divided right and left at a right angle with a predetermined angle so that a portion corresponding to the approximate pipe thickness of the portion a can be contacted without a gap. It is characterized by having a configured mold structure and, specifically, by forming the edge angle at approximately 40.5 degrees and approximately 49.5 degrees.

  Even in the above processing method, because the square pipe is sheared by applying pressure from the outside, the result of bending without gaps is as accurate as the cited invention shows in relation to deterioration of the mold, accuracy failure, etc. It was difficult to expect, and in particular, at least two sides of the square pipe located in the traveling direction of the upper mold were often burred toward the inner surface of the pipe, deformed, and laser welding was often not possible.

  The patent application publication (Japanese Patent Laid-Open No. 11-300422) of Patent Document 4 relates to a bending structure of a long material such as a square pipe. In summary, a bent shape is left in accordance with a fusing technique such as laser fusing. (Refer to FIG. 1 of Patent Document 4 as a reference) A long material folding structure formed by fusing, in addition, a member wall swelling prevention notch structure, a folding position setting means by a folding line, and a position setting means are folding lines. The long material folding structure is characterized in that a hole, a groove, a slit-like cutout groove formed along the triangle, and a triangular cutout groove whose apex is located on the folding line are formed.

  In the invention described in Patent Document 4, when the welding of the joint is required in post-processing, the length of the bent joint is irregular and long, so that it is extremely disadvantageous for welding. In addition, it is unsuitable for production of various small lots that are widely required for store parts for merchandise display, etc., and in the case of a hollow structure such as a square pipe, it is difficult to laser cut into a predetermined shape, and the pipe position is accurate. It was necessary to devise such as reversing. Further, in order to make it easier to bend the one side that remains as a fulcrum for bending, it is dangerous to cut or shorten the groove to cause problems such as insufficient strength when used as a store member for displaying products.

  As described above, the invention described and implemented in the patent literature discloses a rational method for accurately processing by cutting and removing other parts while leaving one side of the pipe to bend the square pipe. Since each of the above-mentioned drawbacks is possessed, a means for bending a square pipe suitable as a store member for displaying products, which solves the problem, is easy to process, and can be easily produced in small lots with high accuracy. It is natural that this is required.

  In general, a square pipe used as a store member for displaying merchandise is used as shown in FIG. 1 as an example. That is, in the store room composed of the floor surface and the wall surface 1, the square pipe 2 is widely used as a product such as an embedded product shelf, a mounting product shelf, a movable product case, a temporary product frame, and the like. It is utilized. As illustrated in FIG. 2, the square pipe 2 to be used is generally configured with a hole 4 having a predetermined size and a pattern on which a jig such as a shelf holder can be attached to a part of or all sides of the square pipe 2. Further, the thickness 3 of the square pipe 2 is generally 1 to 3 mm, particularly from the viewpoint of safety strength. In addition, the material of the square pipe 2 is generally used in the order of steel, stainless steel, aluminum, and brass, and is used with a beautiful finish such as plating and painting.

  In addition, the square pipe 2 when used as a store display member for merchandise is bent as illustrated in FIGS. 3, 4, and 5, and has a U shape, a square frame shape, a staircase shape, and other irregular shapes. After being generally welded such as electric welding, brazing, argon welding, etc., it is polished and subjected to various surface treatments.

  For such merchandise display store members, the conventional technology and patent literature technology have already been explained and the problems have been clarified, but they can withstand the intended use and are generally easy to use without requiring skill. As a result of considering whether or not the square pipe can be bent by general-purpose technology, the main cause of the failure is that the conventional technology (which will not be described in the following description) takes the means of completely cutting, butting and welding the pipe. Therefore, there is no need to argue that good product modeling can not be done. Further, in the technique shown in the very progressive patent document (hereinafter, this will be described as the prior art), since at least two sides of the cut portion of the hollow square pipe are cut from the outside, It was found that the dent-like deformation, the burrs in the inner direction, and the gaps generated during bending hinder general welding techniques, have poor finish, and lack safety and strength.

  As a result of diligent research, the present inventor decided to cut the wall thickness 3 of the square pipe 2 from the inner surface to the outer side of the side where the square pipe 2 needs to be cut and cut to solve all the problems. Then, since a female type and a male type can be used, deformation that becomes a problem during bending joining can be remarkably suppressed, and the generated burr can be formed outside the square pipe 2, so that it is extremely good when welding the bending joint. It has been found that results can be achieved, and it has become possible to eliminate almost all of the conventional problems.

  That is, the invention according to [Claim 1] is the first (as the first step) in the metal square pipe bending means constituted by four sides, which is formed by cutting and cutting a predetermined portion of the three sides while leaving one side of the portion to be bent. An inclined portion 8b having a bending angle of the square pipe 2 and an inner mold 10 having a flat concave portion 11a slightly deeper than the thickness 3 of the square pipe 2 and an inclined portion 8c having a bending angle of the square pipe 2 And a female die 13 having a flat recess 11b at a position slightly deeper than the thickness 3 of the square pipe 2, and a male die 7 having an inclined portion 8a having a bending angle of the square pipe 2 is arranged. Then, a predetermined portion of one side (the width direction of the pipe) facing the side 2A that is left without cutting and cutting the square pipe 2 is cut and cut, and the insertion hole 9 of the next process male die 15a or 15b is provided. As the second step) The male pipe 15a or 15b inserted into the square pipe 2 having the inclined portion 8e having the bending angle of the square pipe 2 and the female die 16a or 16b having a cut and cut shape (equivalent shape to the inclined portion 8f having the bending angle) are arranged. Then, the inclined portion 8dd having a predetermined bending angle from the inside to the outside of the square pipe 2 by the male mold 15a or 15b in which the remaining two sides of the square pipe 2 to be cut and cut are inserted into the inner surface of the square pipe 2. It is a square pipe bending means used as a store member for product display, characterized in that a predetermined portion of the square pipe 2 can be cut and cut so as to be bent.

  The invention according to [Claim 2] is that, in Claim 1, burr 6 generated at the time of cutting and cutting is generated on the outside of the square pipe 2 so that the bent joint surface 5 can be easily and accurately welded. It is to make it a characteristic structure.

  [Claim 3] The invention according to [Claim 3] is that, in Claims 1 and 2, a female die 16b having an R-shaped recess 19a at a predetermined position on one side 2A left without being cut and cut, which becomes a fulcrum part of bending, By the plastic deformation of the square pipe 2 wall thickness 3 by the male die 15b with the R-shaped convex portion 19b, the R-shaped convex portion 19c is configured to protrude toward the outside of the side 2A where the square pipe 2 is not cut and cut. This is to finish the bent joint surface 5 with higher accuracy.

  In the invention according to [Claim 4], in Claims 1, 2, and 3, as a first step, the inclined portion 8b having a pipe bending angle to be inserted into the square pipe 2 of the material and the thickness 3 of the square pipe 2 are used. It has an inner mold 10 having a flat recess 11a at a slightly deep position and an inclined portion 8c having a bending angle of the square pipe 2, and is flat at a position slightly deeper than the thickness 3 of the square pipe 2. The female mold 13 having the recess 11b is arranged, and the male mold 7 having the inclined portion 8a having the bending angle of the square pipe 2 can be configured as the insertion hole 9 of the second process male mold 15a or 15b. Deploy. Further, as a second step, a male die 15a or 15b inserted into the square pipe 2 having an inclined portion 8e having a bending angle of the square pipe 2 at a predetermined position, and a female die having a cut and cut shape (a shape equivalent to the bending angle inclined portion 8f). 16a or 16b is arranged. When the male mold 15a and the female mold 16a are used and arranged, an operation of inserting the male mold 15a into the insertion hole 9 and an operation of cutting and cutting from the inside to the outside of the two sides to be cut and cut of the square pipe 2 are performed. In addition, when the male mold 15b and the female mold 16b are used and arranged, the operation of inserting the male mold 15b into the insertion hole 9 and the side 2A of the square pipe 2 that is not cut and excised can be plastically deformed. The angle formed by arranging the hydraulic press mechanism 22 and the entire control mechanism 23 that enable the operation of pressing between the male mold 15b and the female mold 16b and the operation of cutting and cutting from the inside to the outside of the two sides to be cut. This is a processing device for bending means of the pipe 2.

  As mentioned above, by bending the predetermined part of the square pipe in the length direction of the pipe, it becomes possible to bend without any conventional problems, welding, polishing, painting, The finish in post-processing such as plating is good, and the production technology is very easy and accurate.

  As described in the outline of the present invention, the present invention is a store for merchandise display that requires production of various small lots and requires sufficient strength, safety and aesthetics in the field of bending and using a square pipe having four sides. This is an unprecedented technology that can provide bending accurately, easily and with good productivity, and does not require any special attention or special welding technology. In addition, its welded finish is beautiful, and beautiful finishes including subsequent polishing work are extremely easy and there is no deterioration in strength, so it is possible to provide store members for optimal merchandise display and generally without using special machines. It can be achieved by a general-purpose machine such as a widely used press. Therefore, even in the production of many kinds of small lots, a small-scale business entity can sufficiently cope with the effects, and the effect is great.

It is a reference perspective view which shows the usage example of the store member for goods display. It is an image figure of the square pipe which consists of four sides of this usage example. It is a figure of bending and finishing of a square pipe in the usage example. FIG. 10 is a diagram illustrating how a square pipe is bent and finished in another example of use. FIG. 10 is a diagram illustrating how a square pipe is bent and finished in another example of use. It is an example of the cross-section of the length direction of a square pipe which shows the state of the cut surface comprised in order to carry out the bending of this invention. It is an example of a section structure showing the bending joined state of a square pipe of the present invention. It is a 1st male example perspective view for providing the insertion hole which inserts the 2nd male type | mold used as the 1st process of this invention. It is a perspective view of the square pipe which shows the insertion hole comprised at the 1st process of this invention. It is a perspective view of an internal type (medium core) for producing the square pipe of the first step of the present invention with high accuracy. It is a perspective view of the female type | mold arrange | positioned on the outer side for producing the square pipe of the 1st process of this invention accurately. It is a perspective view of the 2nd male type used at the 2nd process of the present invention. It is a female type perspective view of an example used at the 2nd process of the present invention. It is a perspective view which shows the movement of the 2nd male type inserted in the square pipe in the 2nd process of this invention. It is a perspective view which shows the condition which the 2nd male type | mold in the 2nd process of this invention operate | moves back and forth, and cuts the predetermined location of a square pipe. It is a perspective view which shows the state of the square pipe which the 2nd process of this invention was completed. It is a perspective view of the most preferred second male type used in the second step of the present invention. It is a perspective view of the most preferable 2nd female type used at the 2nd process of the present invention. It is a perspective view of a square pipe having the most preferable cutting structure in the second step of the present invention. It is a perspective view which shows the state which bent the pipe after completion | finish of the 2nd process of this invention. The perspective view which shows the driving | running state of the processing machine which combined the 1st process and 2nd process of this invention. It is a perspective view which shows the predetermined part cutting example of the most preferable square pipe of this invention. It is a perspective view which shows the state of the bent square pipe of this invention.

    That is, as shown in FIG. 6 (example of a partially cut cross-sectional structure of the square pipe 2), when the outer female type and the inner male type are used at a predetermined cutting position and the square pipe 2 is cut, the bent joint surface 5 is The burr 6 generated by the male-type and female-type clearance is generated in the outward direction of the square pipe 2 while the deformation can be minimized. As a result, as shown in FIG. 7 (an example of a cross-sectional structure showing the bent joint state of the square pipe 2), when the square pipe 2 is bent and joined at the cut portion, the joint surface 5 is joined with almost no gap. And the burr 6 is aligned toward the outside of the square pipe 2. The burrs 6 are generated in any way and are generated by the consumption of the mold, and are usually disliked in the field of machining, but this works favorably in the present invention.

  That is, at the time of post-processing welding, the burr 6 is first melted by almost all general-purpose welding methods regardless of the use or non-use of the molten material, so that the burr 6 is first melted and the welding joining is almost completed. In the case of using a molten material, welding can be more completely performed. In addition, since the component of the burr 6 is the same as that of the square pipe 2, it can be expected that the structural change can be reduced and the strength can be improved. According to the operation of the present invention, it is better that the burr 6 has a certain amount. Therefore, it is possible to operate without worrying about the wear of the male type and the female type with little attention to the mold life. Become. In addition, since the deformation of the bent joint surface 5 of the square pipe 2 is small, not only is the finish beautiful, but the above action is further improved, and there are burrs 6 and there are few gaps, so the mold is carefully maintained and adjusted. Laser welding is now possible.

  In this way, in order to move the male mold outward from the inner surface of the square pipe 2 and cut the necessary portion (thickness 3 or the like) of the square pipe 2 in the outward direction, It must be located inside. For this purpose, the present invention needs to make a hole on one side in the bending direction of the square pipe 2 having four sides as a first step. A specific example will be described. A first male mold 7 having an inclined portion 8a that is bent at the left and right ends of the tip as illustrated in the first male mold 7 (perspective view) of FIG. 8 is prepared. . Next, as an appropriate means, an internal mold (core) 10 (explained in the examples described later) as shown in FIG. 10 that can be inserted inside the square pipe 2 is inserted, and will be described in examples described later. After a female die 13 as shown in FIG. 11 corresponding to the outer blade is arranged outside the square pipe 2, the first male die 7 is pressed in the front-rear direction by the hydraulic press mechanism 22 shown in FIG. 9 (a perspective view of the square pipe 2 provided with the insertion hole 9 of the second male die 15a or 15b), having a predetermined bending inclined portion 8d, and cutting slightly deeper than the wall thickness 3 of the square pipe 2. Then, the insertion hole 9 of the second male mold 15a or 15b having a width suitable for predetermined bending is provided. In order to provide the insertion hole 9 of the second male die 15a or 15b in the first step which can be said intermediate step, it can be achieved by a method such as a saw blade or a milling cutter, but it should be emphasized in consideration of productivity. This is not the recommended method.

  Next, as a second step, after the female die 16a as shown in FIG. 13 is arranged, the second male die 15a shown in FIG. 12 is inserted into the insertion hole 9 formed in the square pipe 2 shown in FIG. Thus, after the tip of the second male die 15a has almost reached the side 2A to be left of the square pipe 2 after being inserted from above by the hydraulic press mechanism 22, the second male die 15a is pressurized and moved in the front-rear direction, As shown in FIG. 15, a predetermined portion of the square pipe 2 was cut, and the broken waste piece 18a was removed and discarded in the front-rear direction to form an angle 8dd and a width necessary for the predetermined bending as shown in FIG. The square pipe 2 constituting the cut and cut part 17 is obtained.

  When the second male die 15a in the second step is changed to the second male die 15b in FIG. 17 and inserted into the insertion hole 9 configured in the first step by the hydraulic press mechanism 22, the second male die 15b As shown in FIG. 18, the female die 16b is formed with an R-shaped concave portion 19a that is slightly larger than the tip shape (R-shaped convex portion) 19b of the second male die 15b. When pressurizing and plastically deforming, as shown in FIG. 19, an R-shaped convex portion (bulge) 19c is formed on the side 2A (outward direction of 2A) of the square pipe 2 without cutting and cutting without damaging the thickness 3. Thus, it is possible to provide an ideal square pipe 2 that can be bent more accurately and easily. In this way, when the thickness 3 is plastically deformed so as not to be damaged by cutting or the like, a portion corresponding to one side 2A of the square pipe 2 to be left without being cut as in the prior art, the square pipe 2 is not damaged. As shown in FIG. 20, it was confirmed that the bent joint surface 5 can be contacted very well without gaps. If the thickness 3 is reduced by cutting or the like as in the prior art, the location of the cutting flaw becomes the fulcrum of bending, and therefore, when the pipe is bent due to the angle of the cutting portion such as a flaw, It was found that the joint was not perfect and a gap was formed. That is, it became clear that a gap is generated and a defect occurs when the angle becomes sharper than the normal bending angle.

  In the above-described manner, if the portion that needs to be bent is processed in the same manner, bending can be formed in any direction, and the bending angle is also flexible (the bending angle is cut and excised when the square pipe 2 is bent at 90 degrees. When the square pipe 2 is to be folded at 120 degrees with the tip portion of the portion 17 as the center, and when the square pipe 2 is to be folded at 120 degrees, various bendings can be achieved by sorting left and right at 30 degrees. Even if the distribution angle is not changed to a different angle, there is no problem that a gap is formed on the bending joint surface 5, and the bending can be performed accurately. In other words, as compared with the case of 90 degree (right angle) bending, it can be paraphrased that the cut and cut portion 17 should be small when it is desired to bend at an obtuse angle, and the cut and cut portion 17 should be enlarged when it is desired to have an acute angle. The angles of the inclined portions having the predetermined angles indicated by 8a, 8b, 8c, 8d, 8dd, 8e, and 8f are all the same. Moreover, about the operation | movement direction of the 1st male type | mold 7 and the 2nd male type | mold 15a or 15b, the 1st male type | mold 7 of the said description is operation | movement of a horizontal (front-back) direction, and the 2nd male type | mold 15a or 15b is downward from upper direction. Is not limited to lateral (front-rear) movement, the first male mold 7 is downward movement from the top, and the second male mold 15a or 15b is lateral (front-rear) movement following the vertical movement. Needless to say, it can be changed without departing from the technical idea of the present invention. Moreover, specifically about the R-shaped convex part 19c shown to FIG. 19, FIG. 22 of a most preferable example, the R-shaped recessed part 19a of the 2nd female type | mold 16b is formed as the slightly larger R as the 2nd male type | mold 15b. Are preferred. This works effectively when the square pipe 2 having the R-shaped convex portion 19c formed by plastic deformation is bent. That is, since a force is exerted to extend to the outside of the square pipe 2 at the time of bending, in order to eliminate the gap between the joint surfaces 5 accurately and easily, if the outer length is large (the outer R is large), the elongation is increased. Even if it occurs, it is absorbed in shape, so that the purpose can be achieved very effectively. Even when the outer and inner Rs are the same, if the R-shaped convex part 19c is formed so as to swell toward the outer side of the side 2A where the square pipe 2 is not cut and excised, the effect can be exhibited in substantially the same manner. It has also been confirmed.

  An example in the most preferred embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 21 (a perspective view showing an operating state of a processing machine in which the first process and the second process are combined), as shown in FIG. A female die assembly 20 serving as an outer blade in which the female die 13 in one step and the female die 16b in the second step in FIG. This female assembly 20 includes an inclined portion 8c having a bending angle of 45 degrees on the front side with respect to the traveling direction 21 of the product square pipe 2, as shown in FIG. 11, and a flat portion slightly deeper than the pipe thickness. A first step female die 13 having 11b is arranged. Further, a second step female die having an angle inclined portion 8f having a cut shape of 45 degrees left and right distribution as shown in FIG. 18 in the advancing direction 21 of the pipe a little apart, and forming an R-shaped recess portion 19a. 16b is arranged. In addition, the female-type assembly 20 has an insertion groove 14 of the square pipe 2 linearly toward the product pipe advancing direction 21 so as to insert and support the product square pipe 2 which has been drilled with a necessary pattern in advance. It is configured.

  In the female assembly 20, the product square pipe 2 is inserted through the insertion groove 14, and then is slightly recessed from the inclined portion 8b and the pipe thickness suitable for the bending angle of 45 degrees left and right distribution in FIG. An internal mold (medium core) 10 having a flat portion 11a and having an insertion support rod 12 suitable for the entire length of the square pipe 2 is prepared.

  Furthermore, as shown in a perspective view of the operating state in FIG. 21, the hydraulic press mechanism 22 is joined and disposed so as to match the upper position of the portion corresponding to the first process female die 13 in the front position with respect to the pipe traveling direction 21. The first process male die 7 having a bending angle 8a of 45 degrees left and right sorting in FIG. 8 is arranged. Further, a second process male die 15b having a bending angle 8e of 45 degrees left and right sorting and an R-shaped convex part 19b at the tip of FIG. It arrange | positions at the position upper part equivalent to the female type | mold 16b of FIG. 18, and complete | finishes arrangement | positioning of each metal mold | die and the product square pipe 2. FIG. Next, in order to construct the projecting R-shaped convex portion 19c having a preferable shape shown in FIG. 19, in FIG. 21, another hydraulic press mechanism is provided on the entire upper portion of the hydraulic press mechanism 22 provided in the male die 15b in the second step. 22 is joined and installed. This is installed for the purpose of forming the R-shaped convex part 19c by inserting the second male mold 15b into the insertion hole 9 and pressurizing and pressing it. After arranging the respective members as described above, the control mechanism 23 for controlling the operation and the like is provided to bend the square pipe 2 of the preferred embodiment of the present invention (in this embodiment, 90-degree bending modeling will be described). Is completed.

  Next, a specific product manufacturing method will be described by using the above-described apparatus. First, in the processing machine shown in FIG. 21, an SS iron material of 20 mm square, 2 mm thick, and 3,000 mm long is first prepared. Is inserted into the insertion groove 14 of the female assembly 20 on which the square pipe 2 having the already configured predetermined pattern 4 is installed and fixed in the direction of travel 21, and the control mechanism 23 controls the female mold 13 in the first step. The insertion movement is stopped when the length becomes 1,000 mm in the central central portion of the flat concave portion 11b corresponding to. Next, the internal die (core) 10 is inserted into the square pipe 2 by the insertion support rod 12 and accurately set at a predetermined position by the control mechanism 23. Next, the first-step male die 7 is pushed out by the hydraulic press mechanism 22, and one side of the square pipe 2 (the side facing the side 2A that is not cut and cut) is cut and cut. At this time, the portion of the square pipe 2 to be cut and cut is cut so as to rise to the outside of the square pipe 2 to complete the insertion hole 9 for inserting the second process male die 15b. The burr 6 occurs outside the square pipe 2 and does not occur on the inner surface side.

  Next, the square pipe 2 is advanced in the traveling direction 21 and is moved by the control mechanism 23 to the portion corresponding to the cutting position of the female die 16b in the second step. Next, the second process male die 15b is moved downward by the upper hydraulic press mechanism 22, that is, the one side 2A of the square pipe to be inserted and left from the insertion hole 9 of the square pipe 2 is formed in the second process female die 16b. The pipe thickness 3 is pressed down along the R-shaped recess 19a, and is plastically deformed without damaging the pipe thickness. Next, the second process male die 15b is moved so as to be sheared back and forth (outward direction of the pipe), the remaining two sides to be cut and cut are cut, and the inclined portion 8f having a bending angle of 45 degrees for left and right distribution The cut and cut waste pieces 18b on the two sides of the square pipe 2 cut in the same manner are discarded to the outside. By processing as described above, it is possible to configure the cut and cut portion 17 in which the inclined portion 8dd having an appropriate bending angle is formed. In the present embodiment, the same operation is further repeated twice, and the desired right / left distribution 45 degree bending is performed in which two cut and cut portions 17 are formed at intervals of 1,000 mm in the longitudinal direction of the square pipe 2 as shown in FIG. A square pipe 2 with an angle was obtained. Further, the burr 6 occurred outside the square pipe 2.

  Next, when the square pipe 2 with the R-shaped concave portion 19c is bent with the R-shaped concave portion 19c of one side 2A to be left as a fulcrum, the square pipe 2 is folded into a right U-shape as shown in FIG. , 000 mm square pipe 2 can be bent, and the joint surface 5 is a mating surface without gaps that can be laser welded. Of course, in general welding technology, it is extremely ideal without any problems. Was able to be welded. In particular, in the present invention, since the burrs 6 are formed outside the product square pipe 2, the burrs 6 are melted during welding, the amount of the molten material is suppressed, the finish is beautiful, the structure change is small, and the strength is sufficient. In addition, it has become possible to provide extremely great benefits such as easy and clean finishing of post-treatment polishing, painting and plating.

  The present invention is highly safe as a store member for product display, suitable for various small-lot production, and provides a shaped article by bending a square pipe with a good post-processing finish easily and inexpensively by general means. The possibility of use in this field is extremely high because it cannot be achieved by conventional means.

Reference numeral 1 denotes a wall and a floor in the store.
2 is a square pipe.
2A is a side of a square pipe that is not cut and excised.
3 is the thickness of the side that forms the square pipe.
4 is a pattern hole for attaching a jig such as a shelf holder.
5 is a bent joint surface.
6 is Bali.
7 is the first process male type.
8a is an inclined portion having a predetermined bending angle (8a, 8b, 8c, 8d, 8dd, 8e, and 8f are all the same angle) configured in the first process male die 7.
Reference numeral 8b denotes an inclined portion having a predetermined bending angle formed in the inner mold (medium core) 10.
8c is an inclined portion having a predetermined bending angle formed in the first process female die 13;
8d is an inclined portion having a predetermined bending angle formed in the insertion hole 9 of the second process male die 15a configured in the first process.
8dd is an inclined portion having a predetermined bending angle formed in the square pipe 2.
8e is an inclined portion having a predetermined bending angle formed in the second process male dies 15a and 15b.
8f is an inclined portion having a predetermined bending angle formed in the second process female molds 16a and 16b.
9 is an insertion hole for the second process male molds 15a and 15b configured in the first process.
10 is an internal type (medium size).
11 a is a flat concave portion of the internal mold (medium core) 10.
11 b is a flat concave portion of the first process female die 13.
Reference numeral 12 denotes an insertion support rod for the internal mold (medium core) 10.
13 is a first process female type.
14 is a square pipe insertion groove.
15a is a second process male type.
15b is a preferable second step male type.
16a is a second process female type.
16b is a preferable second step female type.
Reference numeral 17 denotes a cut and cut portion (a space for bending formed in the square pipe 2 in the second step).
18a is a broken waste piece cut and excised in the second step.
18b is a broken waste piece cut and excised in another second step.
19a is an R-shaped recess formed in the preferred second step female die 16b.
19b is an R-shaped convex portion formed on the preferred second-step male mold 15b.
19c is an R-shaped convex portion formed by plastic deformation in the outer side 2A of the preferred square pipe 2 that is not cut.
Reference numeral 20 denotes an aggregate female die that integrates the female die of the first and second steps.
21 is the traveling direction of the product square pipe 2.
22 is a hydraulic press mechanism.
23 is a control mechanism.

Claims (4)

In a metal square pipe bending means constituted by four sides, with one side being cut and cut while leaving one side to be bent, first (as a first step), an inclined portion 8b having a bending angle of the square pipe 2 And an inner mold 10 having a flat recess 11a at a position slightly deeper than the thickness 3 of the square pipe, and an inclined portion 8c having a bending angle of the square pipe 2, and the thickness 3 of the square pipe 2 A side where a female die 13 having a flat concave portion 11b at a slightly deeper position is arranged, and a male die 7 having an inclined portion 8a having a bending angle of the square pipe 2 is arranged, and the square pipe 2 is left without being cut and cut. A predetermined portion on one side facing the 2A (in the width direction of the pipe) is cut and excised, the insertion hole 9 of the next-step male die 15a or 15b is provided, and then (as the second step), the square pipe 2 is bent. Have an angle A male die 15a or 15b to be inserted into the inside of the square pipe 2 having the inclined portion 8e and a female die 16a or 16b having a cut and cut shape (a shape equivalent to the inclined portion 8f having a bending angle) are arranged, and the square pipe 2 is cut and cut. The male pipe 15a or 15b with the remaining two sides inserted into the inner surface of the square pipe 2 is used to form an inclined portion 8dd having a predetermined bending angle from the inside to the outside of the square pipe 2. A corner pipe bending means used as a store member for displaying products, wherein a predetermined portion can be cut and excised and bent. 2. The structure according to claim 1, wherein the burrs 6 generated at the time of cutting and cutting are generated on the outside of the square pipe 2 so that the bent joint surface 5 can be welded easily and accurately. In Claim 1 and 2, by the female type | mold 16b which attached the R-shaped convex part 19b, and the female type | mold 16b which attached the R-shaped convex part 19b in the pertinent predetermined position of the side 2A which is not cut and excised which becomes a fulcrum part of bending 3. The R-shaped convex portion 19c is formed so as to protrude toward the outside of the side 2A where the square pipe 2 is not cut and excised by plastic deformation of the thickness 2 of the square pipe 2 and cut as a fulcrum portion for bending in claims 1 and 2. Due to the plastic deformation of the square pipe 2 wall thickness 3 by the female die 16b with the R-shaped concave portion 19a and the male die 15b with the R-shaped convex portion 19b at the corresponding predetermined position on the side 2A that is not cut, the R-shaped convex A structure in which the portion 19c protrudes toward the outside of the side 2A where the square pipe 2 is not cut and excised. In Claim 1, 2, and 3, the internal mold | type which has the flat recessed part 11a in the position slightly deeper than the thickness 3 of the thickness 3 of the square pipe 2, and the inclination part 8b which has the pipe bending angle inserted in the square pipe 2 inside as a 1st process (Medium core) A female die 13 having an inclined portion 8c having a bending angle of 10 and the square pipe 2 and having a flat concave portion 11b at a position slightly deeper than the thickness 3 of the square pipe 2 is arranged. The male mold 7 having the inclined portion 8a having the bending angle of the pipe 2 is arranged so that the insertion hole 9 of the second process male mold 15a or 15b can be formed. Further, as a second step, a male die 15a or 15b inserted into the square pipe 2 having an inclined portion 8e having a bending angle of the square pipe 2 at a predetermined position, and a female die having a cut and cut shape (a shape equivalent to the bending angle inclined portion 8f). 16a or 16b is arranged. When the male mold 15a and the female mold 16a are used and arranged, an operation of inserting the male mold 15a into the insertion hole 9 and an operation of cutting and cutting from the inside to the outside of the two sides to be cut and cut of the square pipe 2 are performed. In addition, when the male mold 15b and the female mold 16b are used and arranged, the operation of inserting the male mold 15b into the insertion hole 9 and the side 2A of the square pipe 2 that is not cut and excised can be plastically deformed. The angle formed by arranging the hydraulic press mechanism 22 and the entire control mechanism 23 that enable the operation of pressing between the male mold 15b and the female mold 16b and the operation of cutting and cutting from the inside to the outside of the two sides to be cut. Pipe 2 bending means processing apparatus.

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