JPH07102386B2 - Draw bench - Google Patents

Description

TECHNICAL FIELD The present invention relates to a draw bench for drawing a pipe material (a round pipe, each pipe, a deformed pipe), and more particularly to a dimensional accuracy (bending, twisting, round pipe). The present invention relates to a draw bench for manufacturing a drawn tube having high circularity, uneven thickness, and surface accuracy.

"Prior Art and Problems" A conventional drawbench has a backbench having a plug setting device that holds a rear end of a plug rod in a pullout core to move the plug rod forward and backward, and a die fixed to a rear end portion in a pullout direction. Carriage rails having a die stand are arranged in series, after the raw pipe is externally inserted into the plug and the plug rod, the front end of the raw pipe is guided to the die, and the plug is advanced to guide it to the tip of the raw pipe. The tube is chucked and pulled out by a carriage type carriage that travels on a carriage rail.

In the above-mentioned conventional drawbench, the plug and the rod before insertion that are externally inserted into the plug rod are held exclusively by the plug rod, so when the tip of the pipe is set in the die together with the plug, the weight of the pipe is changed. Since the received plug rod is bent, the rear end of the blank pipe is lowered, and the center line of the blank pipe for drawing is not maintained on the pulling center line of the plug. Moreover, since the rear end of the blank tube during drawing is unstable and a considerable amount of vibration occurs, the drawing tube is uneven in thickness or bent, and the dimensional accuracy is deteriorated.

Further, since the conventional carriage is of a trolley type, it easily shakes during pulling and running, and from this point as well, uneven thickness and bending of the product easily occur. Furthermore, in such a conventional draw bench, scratches, dents, etc. are likely to occur on the surface of the drawn tube.

Therefore, conventionally, in order to use a drawn tube for a precision part such as a drum of a copying machine, it is necessary to correct the bend of the drawn tube with a roller and to cut and polish the surface.

The object of the present invention is to eliminate the above-mentioned drawbacks, to minimize bending and uneven thickness, to obtain high dimensional accuracy such as roundness in the case of a round tube, and to prevent surface accuracy such as scratches and dents. An object is to provide a draw bench capable of manufacturing a highly precise drawn tube.

"Means for Solving Problems" A pipe material drawing system according to the present invention is, in order to achieve the above-mentioned object, a back bench provided with a die set device for holding a rear end portion of a plug rod at a drawing core level. ,
A die is provided at the rear end in the pull-out direction and a carriage rail on which the carriage travels is arranged in series, and a pipe end holding mechanism that holds the rear end of the raw pipe after plug insertion at the pull-out core level is installed on the back bench. The traveling platform provided is provided in a state of freely traveling along the pulling direction, and a clamp capable of holding the raw pipe at the pulling core level and moving forward and backward is provided above the front end portion of the back bench in the pulling direction. Is provided with an anti-sway roller to allow the traveling roller to travel by rolling contact with the rail or by sliding with the rail.

"Function" The element tube with the plug and plug rod inserted is held horizontally at the rear of the die in line with the drawing center by holding the rear end of the tube end holding mechanism of the traveling table and the front end of the clamp. Even when the clamp is advanced to guide the front end of the raw tube to the die, the traveling table is pulled by the amount of the advance and the vehicle is driven in the same state and held in the same state. Further, in a state where the clamp releases the raw pipe, the raw pipe is held horizontally by the pipe end holding mechanism and the die while being aimed at the pulling-out core, and even while the front end of the raw pipe is chucked to the carriage and pulled out. At the rear end of the raw pipe, the running platform follows along the back bench while the pipe end holding mechanism holds the raw pipe, and the raw pipe is held horizontally until the drawing is completed. Further, the traveling platform and the carriage have almost no shake during traveling due to the above-mentioned configuration.

Therefore, the uneven thickness and the bending of the drawn pipe hardly occur, and in the case of the round pipe, the accuracy of the perfect circle becomes high. Also, the surface of the drawn tube is hardly damaged.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view of a pipe material drawing system using a draw bench according to the present invention.
Is a lifter for lifting the elementary pipe a to a predetermined level, 3 is the elementary pipe a
Is a clamp for appropriately grasping, 4 is a blank tube pusher, 5 is a back bench, 7 is a carriage rail provided in series with the back bench 5, and 8 is a carriage.

The supply conveyor 1 for the raw pipe a has gentle V-shaped raw pipe receivers 11 at regular intervals, and a cushion material (not shown) made of a porous material or the like is adhered to the surface of the raw pipe receiver 11. . The same cushion material is also adhered to the upper surface of the lifter 12 and the portion of the element tube pusher 4 that is in contact with the element group a.

The raw pipe a is horizontally supported by the raw pipe receiver 11 of the supply conveyor 1, and is intermittently sent to the front of the raw pipe extrapolation position b with respect to the plug 6 described later in accordance with the drawing cycle.

In the original position shown by the solid line in FIG. 1, the back bench 5 of this embodiment holds the rear end of the plug rod 61 at the pulling-out core level by the plug setting device 50 provided at the rear end and holds the plug rod 61. Plug rod 61 with the plug 6 fixed to the tip as shown by the chain double-dashed line in Fig. 1 while horizontally supported.
It moves to the external position b of the tube. Plug set device 50
The plug rod 61 into the die stand 71, as described below.
It has a function of advancing and retracting to the side of a die (not shown) fixed inside.

In this embodiment, the back bench 5 is configured as described below, and is moved horizontally to the raw pipe outer insertion position b side, and the original position after the raw pipe a is attached to the plug 6 and the plug rod 61. Works to return to.

The back bench 5 has a groove shape having an insole 51 as shown in FIGS. 3 and 2, and a suitable number of horizontal axes run under the respective mounting arms 54a fixed at appropriate intervals on both sides. Each of the mounting arms 55 is provided with a roller 54 attached thereto, and the rollers 54 are rotatably brought into contact with the horizontal planes of the tracks 53, 53 fixed on the upper surfaces of both sides of the bench base 52 at predetermined intervals along the longitudinal direction, and fixed on both sides by an appropriate number.
A vertical axis steadying roller 55 is attached to the lower part of a, and the roller 55 is brought into rolling contact with the vertical surface of the track 53 to form tracks 53, 5
It is set up so that it can run without shaking within a certain range along 3.

The back bench 5 includes a hydraulic cylinder cylinder 5b, a rack 5d provided on the machine base 5c, a pinion 5e mounted at the center of the bottom of the bench base 52, wheels 5f for stably guiding the bench base 52, and one end of the machine. The moving device 5a is composed of a cable carrier 5g having the other end fixed to the bench base 52 and a cable carrier 5g fixed to the base 5c.

As shown in FIG. 1 and FIG. 2, on the inner bottom 51 of the back bench 5,
Window holes 51a are formed at predetermined intervals, and a support tool 6a made of a roller attached to the tip of an arm 6b pivotally attached to the bench 5 projects from the window hole 51a, and the support tool 6a bends the plug rod 61. It is supported almost horizontally so that it does not occur. This support tool 6a descends or retreats to the state shown by the chain double-dashed line in FIG. 2 when the raw pipe a approaches when the raw pipe is inserted into the plug rod 61.
It does not get in the way of passing the tube.

At the same time that the back bench 5 moves to the raw tube external insertion position b with the plug rod 61 supported substantially horizontally, the raw pipe a in the front position of the back bench 5 after the movement moves to each lifter as shown in FIG. It is lifted by 12 to a level suitable for extrapolation to the plug rod 61 and the plug 6, and at the same time, the shell a
The rear end portion (the rear end portion in the pipe withdrawing direction) is grasped by the clamp 3 that can move back and forth along the back bench 5 and that moves with the bench 5 forward. When the clamp 3 holds the tube a, the lifter 12 descends.

In this embodiment, the clamp 3 that holds the tube a is
As shown in FIG. 2, a base plate 31 is supported on both sides of the back bench 5 on the back bench 5, and a holding guide 32 fixed on the base plate 31 is provided with a shaft 34 capable of advancing and retracting within a certain range by a hydraulic cylinder 33. While holding and fixing the movable base 35 to the tip of the shaft 34, a pair of clamp arms 30 and 30 is provided at the tip of the movable base 35, and the clamp arm 30 at the tip is provided by a drive mechanism 36 provided on the movable base 35. , 30
Is narrowed or widened to grasp or release the base tube a.

It is preferable to attach a not-shown material to the inside of the clamp arms 30 and 30 in contact with the base pipe a so as not to damage the base pipe a.

After the clamp 3 grips the rear end of the raw pipe a, the hydraulic cylinder 33 retreats to the position of the pipe end holding mechanism 21 of the traveling platform 2 described below, and removes the end of the raw pipe a from the plug 6. While being inserted, the tube end holding mechanism 21 is guided, and at the same time, the tube end holding mechanism 21 holds the rear end of the base pipe a. When the clamp 3 grips the rear end of the base pipe a, the base pipe pusher 4 also moves from the front as shown in FIG. 2 to support the front end of the base pipe a.

As shown in FIGS. 1 to 4, the traveling platform 2 has a pipe end holding mechanism 21 for holding the end of the raw pipe a at the center of the front end and holding it at the core level, and a horizontal shaft mounted on both upper sides of the horizontal shaft. Running roller
22,22,22,22 (Figs. 3 and 4) on the back bench 5
While rolling on the horizontal surface of the upper surface of the rails 23, 23 formed on the inside of the upper end part of the rails, the steady rest rollers 28, 28, 28, 28 of the vertical shaft mounted in the vicinity of the rails are also rolling on the vertical surface inside the rail 23. This allows the vehicle to freely travel along the back bench 5 without swinging. This traveling platform 5 does not have a self-propelled function.

In the pipe end holding mechanism 21 of this embodiment, as shown in FIGS. 3 and 4, a pair of chuck pieces 24, 24 opposed to each other in an arcuate cross section are provided on the shaft 2.
It is fixed to 5, 25, and the shafts 25, 25 are rotated by the air cylinder 27 via the link 26 to spread the chuck pieces 24, 24, and the frictional force holds the end of the raw pipe a. ing.
The holding mechanism 21 may have a structure in which the end portion of the raw pipe a is gripped like a normal clamp, or the rear end of the raw pipe a is chucked by other means, and the chuck is used at the end of drawing. It may be configured to release the ends.

As shown in FIGS. 2 and 4, a support tool 2a composed of a pair of umbrella-shaped rollers is provided at the rear end of the traveling platform 2, and the support tool 2a is provided.
The plug rod 61 is supported by.

When the pipe end holding mechanism 21 holds the end of the raw pipe a, the clamp 3 opens the clamp arms 30, 30 to release the raw pipe a, and supports the front end of the raw pipe a at the same level as the holding mechanism 21. The element pipe pusher 4 pushes the element pipe a to the left in FIG. 2 and horizontally moves it, and the traveling table 2 moves backward while holding the element pipe a, until the plug 6 reaches the front end of the element pipe a. To the plug rod. During this time, the raw pipe a is supported only by the holding mechanism 21 of the traveling table 2 and the raw pipe pusher 4.

After the external insertion of the raw pipe a to the plug rod 61 is completed, the clamp 3 holds the raw pipe a (the raw pipe a is held by the pipe end holding mechanism 21 and the clamp 3).
(Supported by and), the pusher 4 returns to the original position shown in FIG. 1, and at the same time, the back bench 5 returns to the original position shown by the solid line in FIG. Since the plug rod 61 is horizontally supported to the back bench 5 at the level of the die withdrawal center before the outer tube is inserted, the tube a is accurately returned to the original position of the back bench 5 and accurately with the die withdrawal center. Will be aimed at.

After returning to the original position, the back bench 5 is locked in a state in which it does not move laterally but is movable in the pulling direction by a lock mechanism (not shown) in a state where the raw pipe a is aimed at the pulling center of the die, and the carriage rail 7 is hydraulically operated. The dice stand 71
The carriage rail 7 is moved forward and fixed vertically to the carriage rail 7. After that, the clamp 3 advances to the die side and guides it to the die in the die stand 71 of the raw pipe a.

After guiding the raw pipe a to the die, at the same time as opening the clamp arms 30 of the clamp 3, the chuck (not shown) of the carriage 8 chucks the front end of the raw pipe a, and pulls out the raw pipe a for a while, Plug rod by setting device 50
61 is moved to the die side, the plug 6 is set to the die position, and the carriage 8 is moved by the hydraulic cylinder 72 shown in FIG.
To advance in the drawing direction to start drawing.

Instead of the above procedure, the front end of the raw tube a may be guided to the die and the drawing may be started after the plug 6 is set at the die position.

By pulling out, the traveling platform 2 having the pipe end holding mechanism 21 holding the rear end of the raw pipe a is pulled forward together with the raw pipe a and travels forward along the back bench 5 to move the pipe end holding mechanism 21. In this embodiment, in which the rear end of the base pipe a is held by the frictional force, the rear end of the base pipe a automatically comes out of the holding mechanism 21 when the drawing is completed.

As shown in FIG. 5, behind the chuck portion 81 of the carriage 8 is a shock absorber that absorbs the impact when pulling out is completed.
82 is provided.

In this embodiment, the carriage rail 7 is shown in FIG.
As shown in the figure, a grooved frame 7a consisting of a bottom plate 73 fixed on a machine base (not shown) and both side frames 74, 74 is used to precisely finish metal such as iron with good workability. The pair of opposed L-shaped rails 75, 75 are fixed to be in contact with the side frames 74, 74.

On the other hand, sliding blocks 84 and 85, which are precisely finished on the sliding side with iron or other metal with good workability, are projected on the vertical side surfaces and the bottom portions of the block frames 83 and 83 on both sides of the carriage 8 on the sliding side. Fixed in this state, wear-resistant sheets 86 and 87 are attached to the sliding sides of the respective sliding blocks 84 and 85, and the sliding blocks 84 on both sides are brought into sliding contact with the inner vertical surface of each rail 75, The sliding blocks 85 at the bottom are respectively brought into sliding contact with the horizontal planes at the bottom of the rails 75 so that the carriage 8 can be moved on the carriage rails 7 so as not to shake.

The sliding block 84 on the side surface of the carriage 8 is embedded in the block frame 83 in a state where the inner surface thereof forms a taper toward the front inside (to the right in FIG. 5) in order to increase the coupling strength in the pull-out direction. .

The bottom sliding block 85 can also be implemented by projecting it on both sides of the block frame 83 in a brim shape and sliding it on the horizontal surfaces of the upper surfaces of the rails 75, 75.

Reference numeral 9 in FIG. 1 denotes a movable support mechanism which is provided above the carriage rail 7 at a predetermined interval, and is constituted by a pair of holding pieces (not shown) which are bent in a hook shape or an arc relative to each other.

Each movable support mechanism 9 sequentially descends with the holding piece opened immediately after the carriage 8 passes below in the pull-out direction,
When the holding piece is closed to hold the pipe being pulled out horizontally, and when the pulling-out is completed and the chuck portion 81 of the carriage 8 releases the pulling-out pipe, the pulling-up pipe is lifted while being supported horizontally, and further the carriage rail Transfer device 10 provided on the side of 7
After horizontally moving upward, the support piece is opened to gently supply the extraction pipe onto the transfer device 10, and then the upper portion is returned to above the carriage rail 7 through a similar path.

The upper surface of the transfer device 10 has a cushion layer (not shown) so as not to damage the surface of the tube.

In the above-described embodiment, the plug 6, the plug rod 61, and the die side in the back bench 5 are piped so as to supply lubricating oil in a timely manner for the purpose of lubrication for drawing.

In the above embodiment, the traveling table 2 may be configured to travel on the rail 23 by sliding similarly to the carriage 8.
Further, the carriage 8 can also be configured to travel on the rail 75 by the same rollers as the carriage 2.

In addition, each support 6a and the traveling platform 2 on the back bench 5
In place of the roller-shaped support 2a of the above-described embodiment, the support 2a has a gentle V-shaped element pipe receiving surface on the upper surface like a lifter 12, and a cushion material is attached to the receiving surface. Conditional supports can be used.

In addition, the back bench 5 of the above-described embodiment has the bare tube extrapolation position b.
However, if the plug rod is supported on the back bench 5 substantially horizontally, the back bench 5 and the front carriage rail 7 can be moved more than in the above embodiment. It can be carried out even if it is provided at a high position and is configured to supply the raw pipe a below the carriage rail 7 and is configured to vertically move the back bench 5 up and down. A structure in which a support shaft is provided and the back bench 5 is moved by rotating the back bench 5 about the support shaft in a horizontal direction by a predetermined angle can be implemented.

The drawbench of the above embodiment is an example in which a round tube is pulled out, but it can be similarly applied to deformed tubes such as a triangular tube, a square tube and an elliptic tube. Further, the draw bench according to the present invention is most suitable for drawing Al and Al alloy pipes,
It can also be applied to drawing Cu and Fe metal pipes.

By the draw bench of the embodiment according to the present invention and the conventional draw bench, trial drawing is performed by changing each drawing condition such as Al alloy tube material, surface reduction rate, drawing speed, drawn tube size, and the like. The results of comparing the roundness of the outer diameter of the pipe and the bending are shown in Table 1.

In Table 1, the roundness of the outer diameter is the value obtained by subtracting the minimum outer diameter from the maximum outer diameter of the drawn pipe, and the bend is the maximum bend amount measured by cutting the drawn pipe to a length of 300 mm (both ends of the pipe are The length from the straight line to the side surface of the pipe at the maximum bent portion is shown.

As is clear from Table 1, the drawbench of the above-mentioned embodiment according to the present invention was able to manufacture a drawn tube having a dimensional accuracy approximately ten times higher than that of the conventional drawbench. Moreover, the surface of the pipe material was not damaged and the surface accuracy was excellent.

[Advantage of the Invention] In the drawbench according to the present invention, on the back bench, the pipe end holding mechanism of the traveling body and the cleans are held horizontally so that the scallop pipe is horizontally aligned with the extraction core, and the basal pipe front end is guided to the plug. At the same time, even during drawing, the pipe end holding mechanism, the die and the carriage hold it horizontally in line with the drawing center, and the structure allows the carriage and carriage to run with almost no shake, so there is almost no uneven thickness or bending, and the round pipe In addition, it is possible to mass-produce pipes with high dimensional accuracy such as outer diameter roundness in drawing by drawing. Furthermore, it is possible to mass-produce pipes with high surface accuracy that are free from surface damage.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a schematic plan view of a drawing system using a draw bench according to the present invention, and FIG. 2 is a diagram showing an external insertion of a raw pipe to a plug and a plug rod. Partially omitted Enlarged side sectional view, FIG. 3 is FIG. 1 arrow A-
FIG. 4 is an enlarged cross-sectional view taken along line A in FIG. 4, FIG. 4 is an enlarged plan view showing a partially broken view of the traveling platform in the back bench, FIG. 5 is an enlarged plan view of the carriage, and FIG. . Explanation of main symbols in the figure 2 is a traveling platform, 21 is a pipe end holding mechanism, 22 is a traveling roller, 28
Is a steady rest roller, 23 is a rail, 2a is a support tool, 24 is a chuck piece, 3 is a clamp, 30 is a clamp arm, 5 is a back bench, 50 is a plug setting device, 52 is a bench base, 53 is a track, and 54 is Running roller, 55 is a steady roller, 5a is a moving device, 6 is a plug, 61 is a plug rod, 6a
Is a support tool, 7 is a carriage rail, 71 is a die stand, 72 is a hydraulic cylinder, 73 is a bottom plate, 74 is a side frame, 75 is a rail, 8 is a carriage, 81 is a chuck part, 83 is a block frame, and 84 and 85 are Sliding blocks, 86 and 87 are wear resistant sheets.

Claims (6)

[Claims] 1. A back bench provided with a die set device for holding a rear end portion of a plug rod at a pull-out core level, and a carriage rail on which a carriage travels with a die provided at a rear end portion in a pulling direction are arranged in series. , The back bench is provided with a traveling end equipped with a pipe end holding mechanism that holds the rear end of the raw pipe after plug insertion at the extraction core level in a state of freely traveling along the extraction direction, and the front end of the back bench in the extraction direction. A clamp that holds the raw pipe at the core level and can be moved forward and backward is provided to the upper part of the part, and the run table and the carriage are provided with steady rest rollers by rolling contact between the run roller and the rail, or sliding with the rail. A draw bench characterized by being driven by. 2. The drawbench according to claim 1, wherein the carriage is slid on vertical planes of the pair of rails facing each other and a horizontal plane of each rail. 3. The drawbench according to claim 1, wherein the backbench is capable of lateral movement laterally and returning to the original position. 4. A pipe end holding mechanism holds a raw pipe by friction with a pair of chuck pieces pressed against the inner surface or the outer surface of the raw pipe.
The draw bench according to claim 1, claim 2, or claim 3. 5. A first member according to claim 1, further comprising a cushioning material such as a porous member at a portion of the clamp that contacts the element pipe.
The drawbench according to item 2, 2 or 3. 6. The draw bench according to claim 2, wherein a wear resistant sheet is interposed on the sliding surface between the carriage and the rail.