JPS6324971Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a die for drawn pipes for producing pipes such as boring rods, casings, outer rods, inner rods, etc. for resource development.

Conventionally, for example, in order to manufacture a large-diameter, thick-walled tube as shown in FIG. 1, i.e., a tube 7b with thick walls at both ends and a thinner wall in the middle, forged tubes at both ends and a uniform diameter tube at the middle were used. It was manufactured by welding. Also diameter approximately 25~35
In the case of small-diameter, thin-walled tubes with a wall thickness of about 2.1 to 3.2 mm and used for frame materials for bicycles, etc., they were manufactured using a tube drawing device as shown in Figure 2.

FIG. 2 will be explained. FIG. 2a is a vertical cross-sectional view of part A in FIG. A support rod 5 is provided, and the plug support rod 5 is fixed to a plug support stand 6 via a hydraulic cylinder or the like (not shown). The material tube 7 is fitted onto the outside of the plug 4 and the plug support rod 5, and its tip 7a is held by scissors 8 provided on the extraction wheel 9. Claw 10 of extraction car 9
is strongly pulled by a chain 11 driven by a powerful drive source (not shown), and is squeezed between the die 2 and the plug 4 and pulled out, thereby producing a drawn pipe 7b from the raw material pipe 7.

When manufacturing tubes using the apparatus shown in Figure 2, for tubes with one type of outer diameter and different inner diameters, the plug 4 should be placed in front of the die 2 so that it does not interfere with the drawing in the tube drawing direction e, as shown in Figure 3 a. When the tip 7a of the material tube 7 is pulled, a small inner diameter tube is created, and when the plug 4 is pushed into the die 2 and pulled out as shown in Fig. 3b, Creates a large inner diameter pipe. Next, for tubes with one type of inner diameter and different outer diameters, insert the plug 4 into the die 2 and pull it out as shown in Figure 4a, a tube with a small outer diameter will be manufactured, and the plug 4 as shown in Figure 4b. When the material tube 7 is pulled out by pushing it out to the left of the die 2,
The outer diameter is reduced between the bearing part of the die 2 and the small diameter bearing part of the plug 4, and further the material tube 7 is enlarged in diameter by the large diameter bearing part of the plug 4, and the inner diameter is reduced to the large diameter bearing part of the plug 4. It is possible to manufacture a drawn tube 7b having a shape as shown in FIG. 7f, which has the same diameter as the diameter of the outside diameter and a larger outer diameter than that shown in FIG. 4a.

As mentioned above, (1) the small inner diameter pipe manufactured in FIG. (2) When manufacturing tubes with one type of inner diameter and two types of outer diameter as shown in Fig. 4b, in order to manufacture a tube with the exact required outer diameter, the wall thickness of the material tube, the small diameter bearing diameter of plug 4, and the plug Since it is determined by the function relationship with the expansion at the large diameter bearing part 4, it is necessary to consider the diameter of the material pipe and the bearing diameter of the plug 4 and die 2. It requires the troublesome effort of manufacturing. (3) Since the pulling force is small to move the plug 4, it is done only by controlling the stroke of the hydraulic cylinder, but when a large pulling force is required, many cylinders are required for the fixed reaction force, resulting in a complicated mechanism.

In manufacturing pipes with multiple diameters, this invention combines a die with multiple bearing surfaces with a plug with multiple bearing surfaces, and the die and plug are oriented in the forward and reverse directions of the drawing direction. It is an object of the present invention to provide a die and a plug used in a device for manufacturing strong and accurate tubes using a device that firmly holds the tubes in a movable manner.

Embodiments of the present invention will be described below with reference to the drawings. First, the apparatus used in the present invention will be explained. Drawing is carried out using the apparatus shown in FIG. 2 as a whole, but the way the die and plug are held in relation to each other is different from the conventional method. FIG. 5 is a side view of the die support. A stopper 16 is strongly fixed to the frame 1 and reinforced with a reinforcing member 17. A die support stand 30 equipped with a hydraulic cylinder 20 is movably mounted on a truck 12, and the truck 12 is mounted on a rail 1.
Move on 2a. 15 is a die support fixing ram, one end of which is fixed to a stopper 16. Fifth
For example, as shown in FIG. 5a showing part B, the large diameter flange 1 at the end of the die support fixing ram 15 is attached to the surface 30a at the bottom of the cylindrical recess 30c of the die support 30.
The surface 15a of 5b is pressed by the pressure of the hydraulic cylinder 20 via the lug 24 protruding from the die support fixing ram 15 connected to the piston rod 23 and pin 25. The pressing force generated in the hydraulic cylinder 20 is a force that opposes the tube withdrawal force, and is a force that opposes the tube withdrawal force (e.g.
150~200t) must be more powerful. The simplest method for fixing to a certain point in space with such strong force is to press and fix it against a stopper.

The dice 2 are attached to a dice support 30.
Therefore, the fixed position of the die 2 is the fixed position of the die support stand 30 as explained above, that is, the right side fixed position (FIG. 5a) and the position where the surface 30b of the die support stand 30 is in contact with the surface 16d of the stopper 16. The position corresponds to the left fixed position.

FIG. 6 is a cross-sectional view of the plug support. 1 is a frame, a stopper 16a is firmly fixed to the frame 1, and the stopper 16a is further reinforced with a reinforcing member 17a. A hollow adjustment screw shaft 18 into which the plug support rod 5 is fitted and which locks and supports the collar 5a at the end of the support rod 5 has a thread cut on its outer periphery and a nut-type stopper 19 screwed therein. The nut-type stopper 19 can be screwed to match the required dimensions of the drawn pipe 7b. The position where the left nut type stopper 19 abuts against the 16b surface of the stopper 16a is the right side fixed position,
The position where the right nut-type stopper 19 comes into contact with the surface is the left-side fixed position. The pushing or pulling pressure of the hydraulic cylinder 20a fixed to the frame 1 naturally generates a pressure stronger than the tube withdrawal pressure. Ram 21
is fitted into the end of the hollow adjusting screw shaft 18, and a ram fixing nut 22 is screwed into the male thread at the tip of the ram 21 to fix it to the hollow adjusting screw shaft 18.

5 and 6, when fixing the die 2 or the plug 4 or moving it while drawing out the pipe, the die 2 is supplied with the hydraulic unit 13, and the plug 4 is supplied with hydraulic pressure from the hydraulic unit 13a to the piping 14. It is supplied to the hydraulic cylinder 20 or 20a through the pipe 14a.

As shown in FIGS. 7a, b, and c, the plug 4 and die 2 of this invention each have two diameters. The tip of the plug 4 has a small-diameter bearing d3, followed by a large-diameter bearing d4 on the base side, and the die 2 has a small-diameter bearing that faces the bearings d3 and d4 of the plug 4 and clamps the material tube 7. A large diameter bearing d2 is formed on the proximal side of the plug 4, and a large diameter bearing d1 is formed on the distal side of the plug 4, opposing the large diameter bearing d4 of the plug 4 to clamp the material tube. Therefore, the inner and outer diameters of the drawn tube 7b are determined by the bearing d3 of the plug 4 and the bearing d2 of the die 2 as shown in FIG.
The state shown in Fig. 7b, which is determined by the bearing d4 of the plug 4 and the bearing d2 of the die 2, and the state shown in Fig. 7c, which is determined by the bearing d4 of the plug 4 and the bearing d1 of the die 2, can be obtained. .

Next, a description will be given of the punching operation performed using the device described above and the invented plug and die.

FIG. 7 is a longitudinal sectional view showing the state in which the tube is pulled out.
FIG. 7a shows the state in which the die support 30 is fixed at the left fixed position explained in FIG. 5, and the plug support is fixed at the right fixed position explained in FIG. 6 and pulled out. The material tube 7 is dimensioned and molded by the bearing diameter d2 and the small bearing diameter d3 of the plug 4. FIG. 7b shows the die support stand 30.
indicates the state where the plug is fixed at the left fixed position, and the plug support is fixed at the left fixed position and pulled out.Dice 2
The material tube 7 is sized and molded by the small bearing diameter d2 of the plug 4 and the large bearing diameter d4 of the plug 4. FIG. 7c shows a state in which the die support 30 is fixed at the right fixed position and the plug support is fixed at the left fixed position when being pulled out. The material tube 7 is sized and molded. In other words, if you continue operations a, b, and c in Fig. 7 in this order, you will get No. 7.
The drawn pipe 7b shown in Fig. e is manufactured, and the drawn pipe 7b shown in Fig. 7a,
If the operations are performed in the order of b and a, the drawn tube 7b shown in FIG. 7d will be manufactured, and if the operations are performed in the order of c, b and c in FIG. 7, the drawn tube 7b shown in FIG. 7f will be manufactured.

The movement of the die support stand 30 or the plug support position during the drawing operation is carried out by the hydraulic units 13 and 13a, which are incorporated in consideration of the relationship between the pipe drawing speed and the moving speed of the die or plug.

As described above, the plug and die in the device for firmly fixing the plug support stand and the die support stand so that they can move in the forward and reverse directions of drawing are the plugs and dies that have multiple bearings as described above, and the required Since the material tube is pulled out under pressure using a bearing, it is possible to manufacture a strong tube with accurate inner and outer diameters at multiple locations, and because the material fibers are continuous without being cut.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an example of a manufactured pipe, Fig. 2 is a side view of a conventional pipe drawing device, Fig. 2a is a longitudinal sectional view showing details of section A in Fig. 2, Fig. 3a, b, 4th
Figures a and b are longitudinal cross-sectional views showing the manufacturing state of manufacturing pipes by conventional drawing, Figures 5 and below show embodiments of the present invention, and Figure 5 is a side view of the die support of the present invention.
Fig. 5a is a longitudinal cross-sectional view showing details of part B in Fig. 5, Fig. 6 is a longitudinal cross-sectional view of the plug support stand, Fig. 7a, Fig. 7
Figures b and 7c are longitudinal cross-sectional views showing the drawn state using the plug and die of the present invention, and Figures 7d, 7e, and 7f are vertical cross-sectional views illustrating the drawn pipe according to the present invention. be. 2...Dice, 4...Plug, 16...Stopper, 1
6a...Stopper, 18...Hollow adjustment screw shaft, 30...
Dice support, d1, d2...Die bearings, d3, d4...Plug bearings.

Claims (1)

[Scope of utility model registration request] A plurality of bearing surfaces of the die and a plurality of bearing surfaces of the plug facing the die are moved in the forward and reverse directions in the tube drawing direction to create a space between the bearing surface of the die and the bearing surface of the plug. A die and a plug used in a method of manufacturing a drawn pipe having multiple outer diameters and multiple inner diameters by drawing a material pipe under clamping pressure, in which the tip of the plug has a small-diameter bearing d3, followed by a large-diameter bearing d3 on the base side. A small diameter bearing d2 is formed on the side in the direction of the base of the plug, and a small diameter bearing d2 is formed on the side toward the base of the plug, and a small diameter bearing d2 is formed on the side facing the plug's large diameter bearing d4, and a small diameter bearing d2 is formed on the side facing the plug's large diameter bearing d4 to clamp the material pipe. A die with a large diameter bearing d1 that clamps the plug is formed on the side toward the tip of the plug.