JPS5893511A - Drawbench for manufacturing different-diameter tube - Google Patents

Abstract

PURPOSE:To obtain a drawbench which allows two front and rear dies to slide in a drawing direction and to be taken out while moving each die in the specific range of a plug having a parallel part and a tapered part, and performs drawing with good size precision through one operation and form plural thick parts. CONSTITUTION:A drawbench for drawing a blank tube 14 into a different- diameter tube 1 consists of a die stand 4, gap leaving member 5, front and rear dies 6 and 7, plug 8, and jaw 12. The two-stage die has a valley part 18 of the same and in the same shape with the thick part 3 of the tube 1 and is held in the stand 4 while held by the member 5 at distance (d) equal to the thick part 3 from a stopper 9. The plug 8 has a parallel part 19 and a rear tapered part 20 and is inserted into a die hold and fixed by a lever 13. The member 5 and die 6 are fixed detachably by bolts 11 and 10, and the die 6 is a separate type. After the tube is moved to left through the jaw 12 to form a thin part 2, the member 5 is removed and the two-stage die is slid to left to form the thick part 3; after the bolt 10 is removed, a rear thin part is formed and the die 6 is extruded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to draw pliers for producing tubes with a constant inner diameter and partially different diameters (different diameters).

Conventional manufacturing methods for producing pipes 1 of different diameters as shown in Fig. 1 with a constant inner diameter and partially different outer diameters include: Cutting method: ■ Forming the thin-walled part 2 from both sides by drawing process, leaving the thick-walled part 3; ■ Moving the plug and pipe, which have a large-diameter part and a small-diameter part, integrally at required intervals and pass them through a die. How to pull out the plug and then pull out the plug (Special Publication f1852-471
), (2) A method of pulling the plug through a die while reciprocating the plug at any time (Japanese Patent Publication No. 52-5471). However, with ■, the material yield is poor and the length of the finished product is limited, and with ■, the thick part of the product with a different diameter is only formed in one place, and the number of steps increases because the drawing direction is reversed. , ■, and ■ all had problems in that the dimensional accuracy of the finished product was poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide draw pliers for manufacturing pipes of different diameters that can form a plurality of thick-walled parts as needed with good dimensional accuracy and yield in one drawing operation.

The draw bench of the present invention is provided with two stages of dies consisting of a front die and a rear die so as to be slidable in the drawing direction, so that the front die can be taken out.

The present invention is characterized in that the position of each die can be moved in a timely manner within a specific range of a plug having a parallel portion 1 and a tapered portion.

The present invention will be explained below with reference to Examples. Figure 2 is.

This is an example of the draw bench of the present invention, and the different diameter pipe l of the original pipe 14 is
It shows the pulled out state. Die stand 4, distance piece 5. Front die 6, rear die 7, plug 8
．． The jaw 12 constitutes a draw bench. The trough portion 18 of the two-stage die consisting of the front die 6 and the rear die 7 has the same shape and dimensions as the thick-walled portion of the pipe of different diameters, and the die is held within the die stand 4 and is held in the die stand 4 by the distance piece 5. Jaw 12 side (- between the provided die horn (-9) (2 required distance d 75E
It is maintained. The distance d is made to match the length 1 of the thick wall portion of the finished pipe with different diameters shown in FIG.

The plug 8 has a parallel part at the front and a curved part at the rear, and is inserted into the die hole and fixed to the rear by a plug rod 13 (2).
In this example, as shown in FIG. 6 is divided into two parts as shown in Fig. 3, and as shown in Fig. 2, it is secured to the rear die 7 by the IOT-, and when the distance piece 5 is removed, the die is removed. It can be removed outside the stand. With the distance piece 5 set as shown in Figure 2.

The rear end of the bearing land 16 of the front die 6 is connected to the plug 8.
The bearing land 17 of the rear die 7 is positioned behind the plug 8, and the distance piece 5 is removed and both dies 6°77 move forward and stop in contact with the die stopper 9. In this case, at least the bearing land 17 of the rear die 7 is located on the parallel part of the plug 8.

Next, the process of forming pipes with different diameters using the draw bench of the present invention example shown in FIGS. 2 and 3 will be explained with reference to FIG. 4. The tool dimensions are determined as follows according to the product dimensions. . Second
The diameter of the front die bearing land 16 and the diameter of the rear die bearing land 17 shown in FIG. The diameter of the thick-walled part of the product is set as the outer diameter of the product, and the shape and dimensions of the die trough 18 such as taper and radius are made to match the shape 1 dimension of the thick-walled part of the product.The outer diameter of the parallel part of the plug 8 is set to be the inner diameter of the product. Insert each die 6.7 into the die stand 4 as shown in Fig. 4a, and set the distance piece 5 between it and the die stopper 9 so as to maintain a distance d equal to the thickness J of the finished product. do.

The dimensions of the raw tube 14 are appropriately selected depending on the processing rate required for the finished product, and the inner diameter is set larger than the inner diameter of the finished product. During molding, the original tube 14 is first set on the draw bench of the present invention as shown in FIG. 4a. At this time, one end of the raw tube 14 is passed through the rear die 7 and the front die 6 from the right side of the figure, but the diameter is previously reduced to a required length using a processing machine such as a rotary swager (not shown). Further, a mouth portion 15 is formed at the tip of the original tube 14 by the processing machine or the like so that it can be gripped by the jaws 12. As shown in Figure 4a, the original tube 14
Pass the processed end through the die hole, grasp the jaw 12 (second jaw 1s15), and insert the plug 8 into the raw tube 14 from the rear.The rear end of the plug rond 13 is left unfixed and free. When the jaw 12 is pulled forward in this state, the original tube 14
and the plug 8 enter the die hole, and the state shown in FIG.
The position of the plug 8 is fixed by fixing the rear end of the plug rod 13 in the most recent position (right side in the figure). At this time, the tip of the plug 8 and the front die bearing land 1
The tube between 6 and 6 is formed as a thin wall portion 2 of a finished tube with different diameters.

Next, the front thin wall portion of the finished pipe with different diameters is formed.

When the jaw 12 is pulled forward from the state shown in FIG. 4 to the state shown in FIG. The plug is deformed, and then the inner diameter side is expanded along the plug taper part 20, and the outer diameter side is slightly raised in the die valley 18, and then the outer diameter side and the inner diameter side are rolled down by the front die 6 and the plug parallel 19. Thin wall part 2 of finished product deformed pipe
is formed. FIG. 4C shows the point in time when the thin wall portion 2 has been formed to the required length, and the jaw 12 is stopped in this state.

Next, the thick-walled portion of the finished pipe with different diameters is formed. First, Figure 4 C
Remove the distance piece 5 as shown in . This removal is performed by removing the port 11 shown in FIGS. 2 and 3, although it is not shown in the same figure. Then,
When the jaw 12 is pulled forward, as shown in FIG. The main tube 14 pushes the rear die 7 from behind, and the front die 6,
The rear die 7 slides on the inner surface of the die stand 4 and faces forward. At this time, the pipe filled in the die trough 18 by the plug 8 becomes a defective product and becomes the thick-walled part 3 of the diameter pipe. In Figure 4 d, there is still a blank space on the 1st day of the die valley. Figure 4g
When the rear die/bearing land 17 is placed on the parallel plug part 19 as shown in FIG. At this time, the front die 6 and the rear die 7 come into contact with the die stopper 9, and the jaws 12 are stopped at the same time.

Next, the rear thin wall portion of the finished pipe with different diameters is formed.

First, when the bolt 10 is removed in the state shown in Fig. 4g, and then the jaw 12 is pulled forward, the original tube 14 is molded by the plug 8 and the rear thin part/6 is formed as shown in Fig. 4f. As a result, the already formed thick wall portion 3 pushes the front die 6 out of the die stand 4. Since the extruded front die 6 is divided, it can be easily removed from the finished product different diameter tube l as shown in FIG. 4g. Furthermore, the jaw 12 is pulled forward and the original tube 14 is pulled out between the plugs 8 with a backward die, and the forming of the different diameter tube i is completed.

In addition, when forming a pipe with different diameters having multiple thick-walled parts 3,
After molding the length of the intermediate thin part that requires the rear thin part/to be shorter by the length of the die valley part as shown in Fig. 4g, the front die 6 is molded as shown in Fig. 5g. )10
Attach it to the rear die 7. Then plug rod 1
3. Unfix the rear end and move the jaw 12 backwards, as shown in Fig. Attach piece 5. Next, pull the jaw 12 forward and pull out the plug 8 together with the original tube 14 as shown in Figure 5C, so that the positional relationship between the plug 8 and the front die 6 is as shown in Figure 4. At this time, stop the jaw 12 and fix the rear end of the plug rod 13. Next, remove the distance piece 5 and move the jaw 12 forward.
(subtract two.

Then, the thick-walled portion 3 of the finished tube with different diameters is formed in the same manner as shown in FIG. 4d. Thereafter, in the same manner as in Fig. 4 e, f, and g (2 rear thin-walled parts are formed). By repeating each process, a tube with different diameters having a plurality of thick parts can be manufactured.

If the thick wall part of the finished pipe with different diameters is long, the die valley must be widened and the drawing distance from C1 to e in FIG. 4 must be increased. In this case, the distance piece 5 can be made thicker, but if the weight increases and it becomes difficult to attach and remove, a notch 21 is provided at the end of the rear die 7 on the die stand 4 side as shown in FIG. , the distance d between the die stopper 9 and the rear die 7 may be made equal to the thick-walled portion (including a part of the taper).

As explained above, according to the draw pliers of the present invention, different diameter tubes with a constant inner diameter and partially different outer diameters can be formed with high dimensional and precision precision from a single original tube in a single drawing process. Depending on the situation, tubes with different diameters having a plurality of thick-walled portions can also be formed.

Figures 2, 3 and 6 are diagrams showing examples of the apparatus of the present invention, and Figures 4 and 5 are diagrams illustrating the process of forming pipes of different diameters by the apparatus of the present invention. .

l...Different diameter tube 2...True diameter tube thin wall part 3.
・Thick walled part of different diameter pipe 4 ・Die stand 5 ・・
Dice Spee 6...Forward Dice
7... Rear die 8... Plug 9
...Die stopper 10...Bolt 11...Bolt 12...Jaw 13...Plug rod 1
4... Original pipe 15... Mouth part 16.
...Front guide stand 17...Rear die bearing land Ground 18...Die valley 19...Plug parallel part 20...Plug taper part 21...Rear die tip notch

Claims (1)

[Claims] Consisting of a guide stand, a distance piece, a front die, a rear die, a plug, and a jaw disposed in front of these. A. The die stand is equipped with a guide stopper on the jaw side. The mouth and distance piece are removably provided to maintain a required distance between the nuclear die stopper and the front die and the rear die, corresponding to the length of the thick-walled portion of the different diameter tube. c. A die valley portion having the same dimensions as the thick-walled portion of the different diameter pipe is formed between the front die and the rear die, the front die is of a split type, and is provided in the guide stand together with the rear die; After the distance piece is removed, the distance piece is integrated with the rear die and can be removed from the outside of the guide stand by the required interval along the guide stand. 2. The plug has a parallel portion on the jaw side having a length equal to or longer than the die trough, has a taper that becomes smaller in diameter toward the rear on the opposite side from the jaw, and is provided so as to be fixed and openable from the rear. Draw pliers for manufacturing different diameter pipes, characterized in that the jaws are provided in front of the grip stand so that they can move forward and backward.