JPH0328966B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention applies cold plasticity of thin-walled pipes to core metals of rollers often used in office automation equipment such as copying machines, printers, electronic typewriters, printing machines, conveyors, etc. This invention relates to a pipe processing device for forming pipes by processing.

(Prior Art) Product A shown in FIG. 4a and product B shown in FIG. 4b serve as core metals for rollers formed from pipes by the pipe processing apparatus of the present invention.

Conventionally, this type of processing has been carried out by the rotary swaging method shown in FIG. 5 or the bulge method shown in FIG. 6.

In the figure, 1 is a workpiece made of a pipe, and 2 is the main body of a rotary swaging device, which rotates as indicated by arrow C in FIG. 5a. 3 is a die slidably provided in the cross-shaped groove of the main body 2; 4 is a backer slidably provided on the outside of each die 3; 5 is a plurality of rotating parts arranged on the outer periphery of the main body 2 and the backer 4. The roller is pressed against the main body 2 and the backer 4 by spring force. Therefore, when the main body 2 rotates in the direction of arrow C, each rotating roller 5 rotates in the direction of arrow E. As shown in FIG. 5a, a step S is provided between the outer circumferential surface of the main body 2 and the outer circumferential surface of the backer 4.

When the main body 2 rotates in the direction of arrow C in the state shown in FIG. Each time the roller 5 contacts the backer 4, the roller 5 strikes the backer 4 toward the center. In this state, if a lateral thrust P is applied to the workpiece 1 as shown in FIG. Deformed.

In the bulge method shown in FIG. 6, an upper mold 6 having a recess 6a matching the finished shape of the work 1 and a lower mold 7 having a recess 7a matching the finished shape of the work 1 are superposed, and the metal The pipe material of the workpiece 1 is inserted into the molds 6 and 7 as shown in FIG. Applying a lateral thrust P to each plunger 8 and pressing the end face of the plunger 8 against the end face of the workpiece 1, the high-pressure liquid 9 is injected into the workpiece 1 through the hydraulic hole 8a provided in each plunger 8. As a result, the workpiece 1 is placed in the mold 6, as shown in FIG. 6b.
It is molded into a shape that fits the recesses 6a and 7a of No.7.

(Problems to be Solved by the Invention) However, in the above-mentioned rotary swaging method, each rotary roller 5 hits each backer 4, which generates intense noise and makes it difficult to obtain a large amount of work. The angle α of the hypotenuse shown in Figure 4 a is also
There is a problem that the angle is less than 10°.

In addition, since the bulge method uses ultra-high pressure, it is necessary to increase the rigidity of each part of the equipment, and the accuracy and shape of the mold directly affect the quality of the product, so mold manufacturing is necessary. costs will increase. In addition, it is difficult to balance the pressing force P of the plunger 8 and the injection liquid pressure, which may cause the workpiece 1 to buckle or cause liquid leakage from the end face of the workpiece 1, so the work requires skill. do. Furthermore, when the workpiece 1 is removed, the liquid must be cleaned up, which is a time-consuming problem.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a vertical groove is provided in the upper part of the frame, a gate-shaped frame is provided that straddles this vertical groove, and the lower mold of the work clamp is The workpiece clamping device is constructed by fixing the two halves on frames on both sides of the vertical groove, and installing an upper mold corresponding to the lower mold so that it can be raised and lowered at the lower end of the mold clamping device provided on the gate-shaped frame. A plurality of sets of this work clamping device are arranged at equal intervals according to the number of machining steps of the workpiece, and a lateral thrust device having dies facing each other is provided at both ends of the workpiece gripped by each set of workpiece clamping devices. A conveyor plate disposed on the frame and provided with a plurality of workpiece holders is movable up and down and laterally by a lever and a link mechanism operated by a hydraulic cylinder, and is supported by each of the lower dies. The workpiece is transported by raising the workpiece, moving it laterally by one pitch of the work placement pitch, then lowering the workpiece to support it on a lower mold, and then moving it laterally by one pitch in the opposite direction of the horizontal movement. A device is installed in the longitudinal groove of the frame to constitute a pipe processing device.

(Function) As described above, according to the apparatus of the present invention, a desired product can be produced by cold plastic working using a pipe as a raw material, so that noise is reduced and the work environment is improved. Furthermore, since it can be easily processed into thin-walled welded pipes, lightweight and low-cost products can be obtained. Further, since the stepped portion of the product can be formed into a substantially right-angled shape or a shape close to it, the length direction can be effectively utilized as the core metal of the roller. In addition, it is efficient because both ends of the workpiece can be drawn at the same time, and since the wall thickness of the drawing part is greater than the wall thickness of the material tube, the rigidity balance of the product is improved and thin-walled pipes can be used effectively.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, 10 is a box-shaped frame of the apparatus of the present invention, and 10a is a vertical groove provided in the center of the upper part of the frame 10. 11 is a gate-shaped frame provided so as to straddle the frame 10, 11a is its support, and 11b is a horizontal beam.

FIG. 3 shows the work clamp device 12, which consists of an upper mold 13 and a lower mold 14, and the lower mold 14 is divided into two parts as shown in FIG.
A semi-cylindrical work holder 15 is embedded in the opposing surfaces of the upper mold 13 and the lower mold 14, respectively, and is removably fixed with bolts 16, respectively. 17 is a guide pin for aligning the upper mold 13 and the lower mold 14; 18 is a bolt for fixing the upper mold 13 to a mold clamping device to be described later; and 19 is a positioning pin provided on the bottom of the lower mold 14. The pin hole 20 is a screw hole for fixing the lower die 14 to the frame 10.

Work clamp device 12 configured as described above
A large number of lower molds 14 are prepared, and a plurality of sets of lower molds 14 are arranged and fixed at equal intervals on the upper surface 10b on both sides of the vertical groove 10a of the frame 10, as shown in FIGS. 1 and 2.

And upper mold 1 corresponding to each of these lower molds
3 is fixed to the lower end of a piston rod of a hydraulic cylinder type mold clamping device 21 provided on the horizontal beam 11b of the gate-shaped frame 11, so that it can be moved up and down.

As described above, the number of work clamp devices 12 installed on the frame 10 may be determined depending on the number of processes for the work 22. For example, if six drawing steps are required to make the workpiece 22 into a finished product, if six sets of workpiece clamping devices 12 are installed in parallel on the frame 10, the processing time will be equivalent to one processing time if the work is performed continuously. In addition, when three sets of work clamp devices 12 are installed in parallel, twice as much machining time as when using six sets is required to obtain one finished product. Become.

In addition, the lateral thrust device 23 is fixed on the upper surface 10b of the frame 10 as shown in FIG. establish. This lateral thrust device 23 has, for example, a hydraulic cylinder fixed to the frame 10, and a die holder 24 (see Fig. 1) provided at the tip of the piston rod to which dies 2 are attached in accordance with each process.
5 shall be removably fitted.

In addition, as shown in FIG.
It is spaced apart from the leftmost lower mold at the same interval as the arrangement pitch of the lower mold 14, and is provided at the same level as the lower mold 14. Further, the workpiece 22 supported by each of the lower molds 14 is raised, then moved laterally by one pitch of the work placement pitch, and then lowered to support the workpiece 22 by the lower mold 14, and then the workpiece 22 is moved in the opposite direction of the horizontal movement. A workpiece transfer device 28 is provided in the vertical groove 10a of the frame 10, and is adapted to move the workpiece one pitch laterally in the direction.

That is, one embodiment of the workpiece conveyance device 28 is
To explain Fig. 2 and Fig. 2, frame 1
Four lifting levers 29 are arranged in the vertical groove 10a of the frame 10, two each on the front, rear, left and right sides, and the base (lower end) of each lever 29 is pivotally supported to the frame 10 by a shaft 30, respectively. The base of a hydraulic cylinder 31 (see FIG. 2) for driving this lever 29 is pivotally supported on the frame 10 by a shaft 32, and
The tip of the piston rod 31a of this hydraulic cylinder 31 is connected to the intermediate portion of the lever 29 by a shaft 33. Note that 34 is a connecting rod between the levers 29, 29, and 35 is a coupling provided in the middle thereof.

Further, rollers 36 are respectively pivotally supported at the tips of the four lifting levers 29, and a conveying plate 37 having a rectangular planar shape and loosely fitting into the long groove 10a is placed horizontally on these four rollers 36. do. Reference numeral 38 denotes a guide provided protruding from the lower surface of the conveying plate 37 in order to prevent the conveying plate 37 from coming off the rollers 36.

Further, the base (lower end) of a lateral movement lever 39 is pivoted to the frame 10 by a shaft 40 between the levers 29, 29 in FIG. The piston rod 41a of this hydraulic cylinder 41 is pivotally supported on the frame 10 by a shaft 4.
3 to the intermediate portion of the lever 39. A roller 44 is pivotally supported at the upper end of the lever 39, and a guide 45 for guiding the roller 44 in the vertical direction is provided protruding from the lower surface of the conveyance plate 37.

Further, a plurality of workpiece receivers 46 are arranged at equal intervals on the left and right edges of the upper surface of the transport plate 37 in FIG. As shown in FIG. 2, the number of workpiece receivers 46 is one greater than the number of lower dies 14 on one side of the conveyor plate 37. That is, in this embodiment, since the number of lower molds 14 is six, the number of workpiece receivers 46 is seven.

Next, the operation of the apparatus of the present invention constructed as described above will be explained. First, a pipe (not shown), which is the material of the workpiece 22, is placed on the rightmost workpiece receiver 46 in FIG. In this state, when the piston rod 31a of the hydraulic cylinder 31 is pushed out, the lever 29 rotates counterclockwise in FIG. 2, and the conveying plate 37 is vertically raised via the roller 36. This vertical guidance is provided by guides 45 and rollers 44.

Next, the piston rod 41 of the hydraulic cylinder 41
When the lever 39 is retracted, the lever 39 rotates counterclockwise in FIG.
Move horizontally to the left in Figure 2 by a pitch. In this state, when the piston rod 31a of the hydraulic cylinder 31 is retracted and the lever 29 is rotated clockwise, the conveyor plate 37 is vertically lowered. The workpiece receiver 46 is placed on the lower die 14 at a position shown in FIG. 2, and the workpiece receiver 46 stops at a position lower than the position shown in FIG. 2 by more than 1/2 of the diameter D of the workpiece 22 (see FIG. 4a).

Next, the mold clamping device 21 operates to lower the upper mold 13, and the workpiece 22 is moved between the upper mold 13 and the lower mold 14.
is held by the force of arrow W in FIG. 3, and then the lateral thrust device 23 shown in FIG. If it is pushed in as shown by P, the first stage drawing process will be performed.

Next, the lateral thrust device 23 is operated to pull out the die 25 from the workpiece clamping device 12, and then the pressing by the mold clamping device 21 is released. During this time, by pushing out the piston rod 41a of the hydraulic cylinder 41 of the work transfer device 28, the transfer plate 37 is laterally moved to the right in FIG. The material of the workpiece 22 is placed on the workpiece receiver 46.

Then, by repeating the above-mentioned operations, the work 22 in the position shown in Fig. 2 will be moved in order...
It is moved to the positions , , , and subjected to drawing processing at the positions . Then, the workpiece 22 that has undergone the final drawing process can be taken out from the workpiece receiver 27.

Note that the die 25 shown in FIG. 3b is a die for final processing, and in this case, the diameter _D1 of the inlet portion is slightly larger than the diameter D of the finished product shown in FIG. The diameter d ₀ may be made slightly larger than the diameter d of the constricted part of the finished product.

As described above, since the processing performed by the apparatus of the present invention is drawing processing, the wall thickness t ₁ of the drawn portion of the finished product is thicker than the wall thickness t of the portion that is not drawn. The inclination angle α of the oblique side l is determined by the material of the workpiece 22, the number of drawing processes, the lateral thrust P, etc., but in this embodiment, it can be up to about 50 degrees.

Further, by changing the shape of the die 25 in each step, it is also possible to obtain a product B having a shape as shown in FIG. 4b.

Further, in this embodiment, only the case where the cross-sectional shape of the workpiece is circular has been described, but it is clear that the present invention can be applied to workpieces with other shapes.

(Effects of the Invention) By implementing the present invention, the following effects can be obtained.

(a) Cold plastic working reduces noise and improves the working environment.

(b) Since the step part of the product can be made substantially at right angles or close to it, the length direction of the workpiece can be effectively utilized.

(c) Since even thin-walled welded pipes can be easily processed, lightweight and low-cost products can be obtained.

(d) By simply changing the inner diameter of the die, pipe drawing of various materials and dimensions can be easily performed without requiring any skill.

(E) Since both ends can be drawn at the same time, work efficiency is significantly improved. Of course, machining only on one side or asymmetric machining is also possible.

(f) Since the wall thickness of the constricted portion is greater than the wall thickness of the material pipe, the overall rigidity balance is improved, allowing effective use of thin-walled pipes.

(g) The device has no rotating parts or heat generating parts, so it is energy efficient.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a part of the device of the present invention in cross section, Fig. 2 is a front view showing a cross section taken along the - line, Fig. 3 a is a longitudinal sectional front view of the work clamp device, and Fig. 3 b is the part thereof. 4a is a sectional view showing an example of a product produced by the device of the present invention, FIG. 4b is a sectional view showing another product, and FIG. 5a is a partial front view for explaining the conventional rotary swaging method. 6B is a side sectional view thereof, FIG. 6A is a sectional view illustrating the conventional bulge processing method, and FIG. 6B is a diagram illustrating its operation. 10...Frame, 10a...Vertical groove, 11...
Portal frame, 12... Work clamp device, 1
3... Upper die, 14... Lower die, 21... Mold clamping device, 22... Workpiece, 23... Lateral thrust device, 24
...Dice holder, 25...Dice, 26...
cradle, 27... workpiece receiver, 28... workpiece transport device, 29... lifting lever, 31... hydraulic cylinder, 37... transfer plate, 39... lateral movement lever, 41... hydraulic cylinder, 46 ...Work receiving,
A, B...product.

Claims (1)

[Claims] 1. A vertical groove is provided in the upper part of the frame, and a gate-shaped frame that straddles this vertical groove is provided, and the lower mold of the work clamp is divided into two parts and fixed on the frame on both sides of the vertical groove, and A corresponding upper mold is provided at the lower end of the mold clamping device provided on the gate-shaped frame so that it can be raised and lowered to constitute a work clamp device, and a plurality of work clamp devices are arranged at equal intervals according to the number of processing steps of the work. , a lateral thrust device having dies facing each side of the work to be gripped by each set of work clamp devices is disposed on the frame, and a transfer plate with a plurality of work receivers is connected to a hydraulic cylinder. The workpiece supported by each of the lower dies is raised, moved horizontally by one pitch of the workpiece arrangement pitch, and then lowered. A pipe processing apparatus characterized in that a work transfer device is provided in a vertical groove of the frame, and the workpiece is supported by a lower mold and then laterally moved by one pitch in the opposite direction of the lateral movement.