CN2205751Y

CN2205751Y - Soft connecting mandrel device for rectangle elbow

Info

Publication number: CN2205751Y
Application number: CN 93206394
Authority: CN
Inventors: 张允立; 宋大伟
Original assignee: BEIJING TIANTAN FURNITURE Co
Current assignee: BEIJING TIANTAN FURNITURE Co
Priority date: 1993-03-19
Filing date: 1993-03-19
Publication date: 1995-08-23
Anticipated expiration: 2003-03-19

Abstract

The utility model relates to a soft connecting mandrel device for a rectangle elbow. The soft connecting mandrel device for the rectangle elbow is composed of a working portion, an auxiliary portion and a connecting piece. The connecting piece is a steel cable, the working portion and the auxiliary portion are connected as integration by the steel cable. The working portion is composed of a plurality of tapered mandrels which are identical in size and shape and are positioned between a mandrel head and a mandrel plate. After the steel cable penetrates through the holes on the mandrel head and the mandrel plate and passes from the grooves of both sides of the mandrel plate, the steel cable is wrapped and fixed on a tensioning plate. The steel cable is tightened by a tensioning screw. When the rectangle elbow is bent and processed, the working portion is bent along with the bending of a work piece. Support range is enlarged, the outer side of the bent portion of a formed work piece is not provided with concave deformation, the inner side is only provided with little concave deformation, and the appearance and the quality of the product have great progress.

Description

Soft connecting mandrel device for rectangle elbow

The rectangular tube bend pipe belongs to the frock technical field of bend pipe operation in the furniture of steel and wood production with the pellet device that is flexible coupling.

In furniture is produced, often will face a charge wall pipe one pipe or rectangular tube carries out various bending machining, in order to prevent that workpiece crooked position cross section in BENDING PROCESS from producing excessive deformation, common way is that a whole core is just inserted in the workpiece pipe now, when workpiece is bent, in workpiece lumen, prop up the wall of distortion, deflection is controlled in the firm core size restricted portion by firm core, behind the o ing, extract firm core out workpiece with the cylinder that firm core links.But, just core can not be crooked in molded workpiece and can not makes crooked in advance, because crooked firm core can't insert or extract out workpiece, equally, flexural deformation under the pressure that when workpiece is crooked, produces for the working position that prevents firm core, what just the working position of core can not be done is oversize, in addition, because just the bottom of core is straight, therefore the inboard to the crooked position of workpiece does not have supporting role fully, the defective of the firm core of use that all are above-mentioned, caused the recessed distortion of the interior lateral surface of crooked position (mainly referring to rectangular tube here) after the workpiece brake forming, again because the lateral surface tension medial surface pressurized of crooked position during curved workpieces, so the recessed degree of workpiece crooked position inboard is greater than the recessed degree in the outside, i.e. the indent 22 and outer recessed 23 that indicates of Fig. 9, this distortion destruction clearly the overall appearance quality of product, be particular about epoch of product appearance U.S. day by day current people, uncared-for problem of this past tends to determine the life of a product now.

The purpose of this utility model provides a kind of outside that can make rectangular tube be bent its crooked position of back does not have recessed distortion, and the inboard rectangular tube bend pipe that has only a small amount of recessed distortion is with the pellet device that is flexible coupling.

The rectangular tube bend pipe is achieved in that with the pellet device that is flexible coupling working position and auxiliary position with existing rigidity pellet separate as two parts, wherein the working position is made up of several shapes, equirotal taper pellet, working position and auxiliary position connect into integral body by steel wire rope, and the working position keeps certain degree of crook under nature.

The rectangular tube bend pipe is comparatively simple with principle, the making of the pellet device that is flexible coupling, and uses this device product processed outward appearance than original method product processed outward appearance great improvement to be arranged, and therefore is easy to promote in furniture industry.

The rectangular tube bend pipe is provided by the following drawings and literal with the concrete structure and the embodiment of the pellet device that is flexible coupling:

Fig. 1 is the pellet device overall structure schematic diagram that is flexible coupling; Fig. 2 is the pellet device side floor map that is flexible coupling; Fig. 3 is the core print schematic perspective view; Fig. 4 is the central layer schematic perspective view; Fig. 5 is the pellet schematic perspective view; Fig. 6 is the pellet end view; Fig. 7 is the pellet side schematic view; Fig. 8 is the view of pellet device in molded workpiece that be flexible coupling; Fig. 9 is the view of firm core in molded workpiece.

The rectangular tube bend pipe is made up of working position, auxiliary position and connector with the pellet device that is flexible coupling, the working position is made up of several sizes, taper pellet 2 that shape is identical, auxiliary position is made up of core print 1, central layer 3, core bar 4, tensioning screw 6 and tensioning plate 7, and connecting piece is a steel wire rope 5.Working position and auxiliary position are linked as integral body by steel wire rope, the working position is in the front portion of device, between core print 1 and central layer 3, the groove 20 that Kong Bingcong central layer 3 both sides on core print and the pellet are passed at two of steel wire rope 5 unrolls fixing on tensioning plate 7 by the back, and steel wire rope is tightened by tensioning screw 6, the steel wire rope of tightening makes core print 1, pellet 2, central layer 3 one ends are close to mutually, size, the working position that the taper pellet 2 that shape is identical is formed is crooked under the nature after the steel wire rope tensioning, bending height is H, and the angle that back formation is intersected in corresponding end line prolongation on working position outermost end two pellets is α.Pellet 2 has pellet end face 8(two ends), 10(both sides, pellet side), two of curved surface 9 at the bottom of the pellet, pellet top curved surface 11 and pellet through hole 12(), the radius of curvature R 1 of the upper and lower arc of pellet end face, the difference of R2 are 10～60mm, choosing of R1R2 can determine according to the bending radius that the workpiece sectional dimension is allowed, the camber h of pellet side is 0～5mm, camber h defines the recessed degree of medial surface after the workpiece bending, and the pellet width B is 10～60mm.Auxiliary position SMIS head 1 has core print end face 13(two ends), two of core print baseplane 14, core print top curved surface 15 and core print through hole 16(), the effect of core print is to be easy to pellet is inserted workpiece; Central layer 3 has central layer end face 17(two ends), about the central layer end face 18(), central layer end screw 19, central layer side channel 20(both sides); Core bar 4 two ends are processed with long and short screw thread; 5 holes on same straight line are arranged on the tensioning plate 7, and its center macropore is corresponding with the long diameter of thread of core bar, and four apertures are corresponding with wirerope diameter and be symmetrically distributed in the macropore both sides.The assembly relation of pellet device of being flexible coupling is: earlier short thread on the core bar and central layer end screw 19 are screwed, tensioning screw 6 is spun on the long screw thread of core bar again, then the center macropore on the tensioning plate 7 is enclosed within on the core bar and is close to tensioning screw, two of one steel wire rope pass successively on core print 1 and the pellet 2 through hole and from the tensioning plate two inboard aperture pass from two apertura lateralises unroll and with clamp with two fag ends and the steel cable chucking of a side separately, screwing tensioning screw at last tightens steel wire rope, the steel cable of tightening passes through a paragraph of central layer in side channel 20, and the pellet device that at this moment is flexible coupling just assembles substantially to be finished.The pellet quantity of pellet device of being flexible coupling is 1～5, when it is tightened by steel cable and is crooked during in nature, be flexible coupling the in other words working position of pellet device is crooked when nature, it is 5～90 degree that corresponding end line on working position outermost end two pellets is prolonged the angle [alpha] that intersects back formation, when nature, the bending height H of working position should be greater than the inner chamber corresponding size of rectangular tube.

When using this device, the working position is inserted workpiece to desired depth get final product.During insertion, because the bending height of working position is greater than the workpiece lumen corresponding size, need when therefore inserting crooked position is broken off with the fingers and thumb, during concrete operations pellet being inserted workpiece enters the mouth, then the axis of workpiece is broken off with the fingers and thumb and the core bar axis coaxle, and enforce workpiece slightly, make the pellet device that is flexible coupling arrive the workpiece desired depth, on the pellet device that is flexible coupling, depth localization is arranged, advance the degree of depth to control by depth localization, advance the degree of depth to be meant that the workpiece port is to workpiece crooked position and the air line distance between the crooked position tie point not, advance the degree of depth on the pellet device that is flexible coupling, be meant central layer 3 not with screw one end to the distance between the depth localization, therefore, the be flexible coupling core print and the pellet of pellet device places in the scope of workpiece crooked position fully.Be flexible coupling the pellet device in Forming Workpiece the time, the working position can be crooked with the bending of workpiece, therefore all form all whole supports that participate in effectively the workpiece crooked position of pellet of working position, the schematic diagram that this situation can be reflected with reference to figure 8, the working position that reflects among Fig. 8 belongs to preferred plan of the present utility model, the pellet quantity of promptly forming the working position is 3, because the distortion of tubular workpiece crooked position generally is from first three of arc of curvature/one section, therefore if the operate portions potential energy support effectively the crooked position arc of curvature first three/segmental arc, just can obtain satisfied mass effect, have only less recessed 21 as showing the crooked position medial surface among Fig. 8.

After workpiece was bent and finishes, pellet was extracted it out workpiece by the cylinder that links with core bar 4 rear portions.

Claims

1, the rectangular tube bend pipe belongs to the frock technical field of bend pipe operation in the furniture of steel and wood production with the pellet device that is flexible coupling, by the working position, auxiliary position and connecting piece are formed, it is characterized in that: the working position is by several sizes, the taper pellet 2 that shape is identical is formed, auxiliary position is by core print 1, central layer 3, core bar 4, tensioning screw 6 and tensioning plate 7 are formed, connecting piece is a steel wire rope 5, working position and auxiliary position are linked as integral body by steel wire rope, the working position is in the front portion of device, between core print 1 and central layer 3, the groove 20 that Kong Bingcong central layer 3 both sides on core print and the pellet are passed at two of steel wire rope 5 unrolls fixing on tensioning plate 7 by the back, and by tensioning screw 6 steel wire rope is tightened; The working position that pellet 2 is formed is crooked under the nature after the steel wire rope tensioning, and the angle that back formation is intersected in corresponding end line prolongation on working position outermost end two pellets is α.

2, rectangular tube bend pipe according to claim 1 is with the pellet device that is flexible coupling, it is characterized in that: pellet quantity is 1～5, the camber h of pellet side is 0～5mm, and the radius of curvature R 1 of arc, the difference of R2 are 10～60mm about the pellet end face, and pellet width dimensions B is 10～60mm.

3, rectangular tube bend pipe according to claim 1 is with the pellet device that is flexible coupling, and it is characterized in that: the α angle is 5～90 °.