JPS5950913A - Method and device for drawing - Google Patents

Abstract

PURPOSE:To reduce working stress, and to improve working rate while maintaining working accuracy, by moving a mandrel in the drawing direction at a speed lower than a drawing speed, and drawing a base pipe while providing the pipe with a tension of the direction reverse to the drawing direction. CONSTITUTION:A mandrel 9 is inserted into a base pipe 7 to abut it to the rear end of a pointing part 15, and a rear-end carriage device 22 is simultaneously advanced to hold the rear end of the pipe 7 by a rear-end carriage claw 28. Then a front-end carriage device 20 moves in the drawing direction to commence a pulling of the pipe 7. At the same time, an electromagnetic clutch is turned ON, and a motor rotates anticlockwise to pull the device 22 reversely in the drawing direction, thereby providing the pipe 7 with a tension of the reverse direction. Further at the same time, a screw in a mandrel driving device 31 to push in slowly the mandrel 9 in the drawing direction thereby pulling the pipe 7 to perform drawing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drawing method and apparatus for reducing the diameter of a pipe, drawing it, etc., and in particular to a drawing method and apparatus for the drawing method for reducing the diameter of a pipe, and in particular for maintaining the dimensions of the inner and outer diameters.
In addition, it relates to a drawing method that aims to improve the processing rate.

There are various methods for reducing the diameter of a mother pipe made of extruded material, such as extrusion press, but in the case of extrusion press, pipes with a size of 20φ or more require several cold workings, which is not efficient. Therefore, it is generally performed by a combination of bar drawing, rolling, etc. One such drawing method is shown in Figure 1 (-).
There is also a drawing method using natural elongation as shown in (b), which involves free contraction of the tube by grasping and pulling the front and rear ends of the main tube (1) as shown in Figure 1 F). The main tube with a length of 40 is drawn to 1 ml with a 7.
'4 Since the natural 6yj shape is performed, the l before and after drawing is
'' is the rate of change of the diameter, that is, the rate of change is Medera bf, but in this method, the free elongation of Sae is corrected, so the 91 method of the inner diameter t7 is Y+'f I['
- has the disadvantage of being dull. K() 7f defect like this
It is also possible to improve dimensional accuracy by regulating changes in the inner diameter and diameter of ζT (ζ) using a 61-die mandrel; Is the evening of the second tube 1ff being regulated by the chair 2)?
'(arrow the end)': ll (When Ijh is pulled in the direction of 31 and reduced, its diameter is reduced it△d(1□卜→卜) If you can draw A with a constant 1st shift, it is an approach of die + 21 The reaction force ΣP due to surface (4) is applied, and the tensile stress applied to the back immediately after exiting the die exceeds the rupture stress, causing the tubes ?11 to (5) to rupture. The (+'!!h stress in such a case is much smaller than the (Clih') stress (iG<) in the case of free extension shown in FIG. If only fljl L is specified, a gap will remain in the dimensional accuracy of the tube in the future. Therefore, as shown in Fig. 2, insert the mandrel (6) that will become the core into the inner diameter part of the die +21, and +lIj between 11Q between 6) and dice (2)
If the product tube is drawn by drawing, the inner and outer diameters of the product tube are suppressed, which improves the machining accuracy, but on the other hand, the friction between the mandrel (6) and the mother tube increases, making it difficult to process. If the ratio is kept the same, the pipe will break with an even smaller force. This is because the mandrel (6) is fixed and the coefficient of friction between this mandrel and the main pipe is large. Therefore, in bar drawing, the mandrel (6) is made up of a full-length bar, and by moving the bar forward at the same speed as the tip of the tube is pulled, the resistance due to friction between the bar and the main tube is reduced. However, with this method, the longer the length of the product, the longer the bar is required, which increases the cost of tools and increases the cutting rate (d/1). It requires special heat treatment equipment for long lengths, and the manufacturing cost is extremely high.

The reason why it is not possible to obtain a large processing Sv) by drawing to improve -r l+t6 treetop 11- using a die as described above is due to the increase in reaction force on the approach surface of the die, as shown in t+iJ. If it is possible to reduce this, it is possible to improve the processing rate while reducing the external 11'1 degree. Also use a mandrel to measure the inner diameter! 'I'j I! 'J: Direction' - In the first case, the mandrel can be moved in the direction of bar drawing. Death, inside?Th Y+'7
The improvement of /It and the improvement of machining rate will be achieved all at once.

Therefore, in the present invention, as shown in FIG.
The shape of the main tube of < tA tail is shown by the broken line (7), which is a gentle song Mi! In order to reduce the contact area between the main pipe and the die approach (8), the resistance force on the approach surface is lowered, and the mandrel (9) of the short length is drawn much more than 7 mouths. to I
(By stirring 'M-rR> in the drawing direction at a slow speed, the resistance force due to the contact fjt+ between the mandrel surface and the main tube is reduced, and the tensile force P itself, which is necessary for drawing, is reduced. This was done to improve the processing rate by making it possible to perform careful cross-sectional peeling using the method, which shortens the length of the mandrel and significantly improves the accuracy of the internal and external parts of the product. It was created by

Next, an actual example embodying the present invention will be described in detail with reference to the attached drawings 1111 in FIGS. 4 to 4F. Here, the 41st screen 1 (1) to (C) show the preparation letter L!!4 of drawing ('+i ES%), and the same figure (R) shows that the material 1i) (7) is extruded. [It shows that the tip has been extended from the 7 line and hit the stopper 11111'', and (1) in the same figure shows the tip 1'@1 of the IJ 'i'. ``L-J'' indicates the operated state.'Y#
Figure 1111, figure 5, and figure 7 show the initial, intermediate, and final states of the drawn soil and gravel. Condition ρ! This is a flat 1 + j loss 11 diagram showing 1 □ To explain in order from Figure 4 (λ), the mother v (7) is the example of 8153 (14 net'r) of 40φX3t, and is discharged from the extrusion line. The tip is moved over the guide roller (11), and the tip hits the stopper (10) and is temporarily stopped at that position.Subsequently, f and t are moved by a kicking device frf (not shown).
Ith'1 (7) is pushed out in the direction of (ij11) and hits the C stopper (11) that rolls on the guide rail 113, stopping at that point 1〆j -C-It,7 i.:c.

In this state, the device t:(LI4) cuts out the mouth and compresses the tip of the main tube til, Ll fi 1JiIl
: Play t+5i 1! - to do.

If Ll is attached to 'j'iE, 'J' then mother
e)-)-4-ru to Ciφ1 (・Figure 44 (C)) ,,
Mother't-<('7) (1) i1 (toward 11 (1)
4jJ ki G, l 7 t 7 bar (17)-'
tek"lLi+t'l saJ>,,PJ 'mj):
+1! >1 is the middle I of the die (2) fixed by the dice backer IHII,
At this position, Fij is inserted into the gear ridge 1 (21) provided on the tip carriage 17.111 and is firmly gripped by the gear ridge pawl (21). At the rear of the main tube axis extension, there is a mandrel (9) and a rear end carriage installation h1μ! I have 1lill of love! Press +lL C
AI) is installed It(control m11 device +'(+7
:(l is a pair of left and right chainlets 41.1141f *kicked drum 5), 7jf4 drum is electrically rotated by a motor V71 via a clutch (4), and the tip 1 of the chains t2J and Ql. /iA+, and between the songs, the rear end l (carriage armature G (4) and the rear end carriage 'A li
! The mandrel rod Q-Kai that hits t + E, and the short rod-shaped mandrel 19) that can be seen at its tip.
4 =! 'Immediately move the high-speed moving J motor and mandrel rod with low oil movement device 61.
) and & 4j shi, extension axis of mandrel (9) and mandrel rod (21C41 arm (1'))
6 has been done.

Prior to extraction operation, Maji'\It, U<clutch C
Let (g) be oi'l; and rotate the drum (c) freely.
177r and the state where K can be performed, and the mandrel Iw with kλ,
Activate the fii++ device t'(C'l11) and the sieve transfer shearing motor, and move the mandrel (9; Place the mandrel (9) in one stroke (7) and place it in contact with the mouth f'J'IJ'j'+Ij II~, and also press the regret carriage attachment fN E.
i'a let me do it: 4k Y ridge claw 1 layer tv
Firmly grasp the rear end of the material (7). In this way, the 'tl'l friif of the drawing work is completed.
Yaritsuji'%1: t31 starts pulling the mother t'F by applying '14 F+ to the direction li'rj indicated by the arrow [;1+ u mark. At the same time, ↑1id (clutch ('@ is ON)
At the same time, the motor f271 turns counterclockwise to the chain Q4J, C), ζ)? The rear end key Y ridge is installed by pulling it in the direction of winding it into the drum.
The drawing direction indicated by the arrow tll is drawn in the 7ψ direction,
It'i gripped by the rear carriage claw (column)
'1 (7) When the drawing direction is melted and the tension in the opposite direction is increased by ζ1, the mandrel river at the same time! Drawing device; j j The screw mechanism in Kawauchi is used to push the mandrel (9) in a low succession in the drawing direction shown by arrow 1:l fl. In this way, while applying tension to I+j'It(7) in the opposite direction to the drawing direction, subtract 11(7)(
Figure 66 shows the state in which the drawing process is being performed. In this state, the electromagnetic clutch (to) maintains a slip state, and this ttf, the clutch's dissipation, and the friction of the ri1 river cause the drum (2) to 'hl II,? A constant co-rotating force acts, and a constant tensile force is applied to the main tube (7). Concentrate on the tapered part of the mother Iu that contacted the approach part of the die, and this
By causing the taper part of the cypress to undergo deformation as shown in Figure 3,
The reaction force ΣP caused by the ab p-chi n1N of the dice is reduced to a low level.The above-mentioned drawing operation is repeated M, and the main pipe (7) is drawn over its entire length as shown in Fig. 7. In the mandrel (after 91, the jaw is the bearing j' of the die (2),
The 8-movement ti of the mandrel (9) is set so as to reach i19. In this way, when the drawing is light r, T > F then k 1m4 hJ ”A 11 L (111fi WJ
and the mandrel rod (2) and mandrel (9).
M, and once the tip of the mandrel (9) has secured the rear Y-carriage claw, the Dice Bucker 111 and Shun l-
The carriage claw (2) is released at the same time, and the die +21 remains attached to the rear end of the unloaded die backer: +
! At the same time, the movement of ・11'J pain carriage device r< stopped and q・nu was hit in front of 17.
1 I (Hj++l of 1, Q stops. Cut 1 at these 11 points. 1 fly (IIs) is cut 1 + Ii L/te book dent '1
4' hJ4 (1) (F Cut the shoulder into a seagull and dice (
2) Remove the rear end of the MINO 111 main pipe from the drawing hole. This LiJ L17+ operation may be performed at the IZ final culm where the drawing tube is taken out.

The above-mentioned drawing work can be done in both dry and cold conditions, but cold drawing requires degreasing, washing, and drying.
Mr. K's series of upper rods, including water jumping, annealing, roll straightening, washing, washing, and drying chestnuts, will give you peace of mind. In addition, the 11th Sue was 1oo
o % or more red-hot lu 't: #' If you send a flight to a month, all '-1 early from the above-mentioned Ija to Kan pp will be omitted and the efficiency will be increased. good draw 1
Method A is (r+).As above,...
The same bolting has an effect comparable to that of the stretch reducer, mandrel mill, plug mill, and Erhard method in terms of image quality, but these conventional methods reduce surface defects when the mother's is stainless steel. However, in this respect as well, the drawing method according to the present invention is completely satisfactory.

As described above, the present invention aims to reduce the reaction force on the die approach surface by applying tension to the base material in the opposite direction to the drawing direction. It is desirable that the narrowed main beak on the approach surface can be easily deformed, and if this requires a long drawing time and the main tube is cooled so that deformation does not occur easily, die i2) is used. It is desirable to place a heating device (11.6 g) immediately before the main tube entering the die (2) to make it red hot. High viscosity glass of 1200°C class is used, and approximately 0.1% of this is attached. In such glass spots, 26 during drawing due to the relationship with drawing mtt.
If the 4th degree is (It F), there will be a risk of glass pushing, so supply 700″C class low dry glass to within 1 ft of the extruded ft at the IJ' t) part. It is ``口'' し to make the meeting lW moe. In addition, the dice used in the present invention include j9 ji4 dice a, rotating dies, rotating rolls, etc. for IIp.

As described above, the present invention provides a mandrel for controlling whitening of the drawing tube with low oil.1. By avoiding that process, we succeeded in reducing processing stress and shortening the length of the mandrel itself, and by pulling the main tube that is being drawn in the opposite direction to the drawing force of 1 ft+, Since the low F of the reaction force on the surface is January, the drawing ゛R
The inner workings and (the first diameter of the first diameter, while keeping the second degree high,
It was possible to improve the processing rate, ・In J4'4, hot drawing was performed using the fiJ tube made by Samurai III, cold drawing in RIF was achieved.・17? The prolapse 11tj inserted before the one end-to-end drawing that was the key! W-Kyo, Kushij-sha,
Processes such as roll straightening, ground removal, cleaning, #clean lead leather imitation treatment, 1'' attachment, and subsequent drawing can be omitted, for example, approximately 40
25φ×2L (machining rate is approx. 59
%), t% continuous processing can be performed, and compared to the conventional separate drawing process, the drawing process can be performed once by rolling or from 1 to 2 times.
This can be done in a timely manner, but it makes a significant contribution to labor saving, downsizing of equipment, low unit consumption of tools, etc.

[Brief explanation of the drawing]

1 and 2 are side sectional views showing a conventional drawing ray 4.1, FIG. ) to (C) are drawing work A1
The figure (a) shows the main tube which is the material (
7) has been discharged from the extrusion line and collided with the stopper port U. The same figure (b) shows the state in which the tip of the main tube has been cooled by 1 J. Layout #1 diagram, lid diagram (plane cross-sectional view showing the state immediately before starting the drawing process of the C agricultural J1 board; Figures 5 to 147 show the initial, intermediate state, and final state of the drawing process) '・Rib 1:I
It is a diagram. 7...mother tt..., 2 river dice 9...
Mandrel, 32...Ji! l to A f1-(' to crystallize 20... point ('-Gallidge b?, :31
... Mandrel feeding device 22 ... Rear wheel gear ridge device M. 33°゛-41# 'White horn 11 people・l・! Kan α,
25...Drum 24...Chain, 26...f
IT, Pi Crudge, Outer Co., Ltd.
Patent attorney, Kobe Steel, Ltd.
Takeshi Honjo ν〕] Kutsuzuki Nedi iF '轡: (Method) 1981 2712 E+ 2, Name of the invention Lottery 1 A-force l removal and its device 3, Relationship with the case of HliiT' Patent issue Person Address: 1-1-I"13-1 Wakiwo Hyomachi, Nakagashi-ku, Kobe City
8. Name (II!l) Shareholder Association 1 Ushindo M Sentaoka jsu〒 Representative j Official i 4 Takashi Takashi 1〒4,
Agent 〒530 5, Amendment Order No. 11 January 1988 EI (
6. Column 1 of "Detailed Description of the Invention" and Column 1 of "Simplified Description of Drawings" of the specification attached to the application for "Amendment Woman" ? Contents 1 of +1iil, page 7 of the specification, lines 11 to 17 [4th
From Figures (l) to (C> is a plane cross-sectional view that does not show the state, "U7" shows the state, and (b) shows the tip of the main tube 11i1.
Part G, 2l + (=I shows the state in which it was made, and the same (
, -, ) indicates the state immediately before L'J enters the drawing operation of the main pipe, and j is ill' iF <. ■, Line 1I of the 15th line of the specification [-1 to 17th line [41st fork 1(a) to (c)]...shows the condition "4・1ilJ' In the i-side view, the number 1 indicates the 1st 41st piece ltJ preparation for drawing work. 7) is extrusion 2
It is discharged from the line and inserted into the 7 bar (l [1), and the same (h) is the same). (c, ) indicates the state immediately before entering the drawing punch business of the main pipe, so 1 is corrected by n1.87

Claims (1)

[Scope of Claims] 1. Performing a drawing process while regulating the inner and outer diameters of the product between a mandrel inserted into the main tube and having a smaller diameter than the inner diameter of the main tube and a die having an inner diameter smaller than the outer diameter of the main tube. A drawing method characterized in that the mandrel is moved in the drawing direction at a speed slower than the drawing speed, and drawing is performed while applying tension to the main tube in the opposite direction to the drawing direction. 2. In a drawing method in which drawing is performed while regulating the inner and outer diameters of the product between a mandrel inserted into the main tube and having a smaller diameter than the inner diameter of the main tube and a die having an inner diameter smaller than the outer diameter of the main tube, the mandrel is drawn. A drawing method characterized by moving in the drawing direction at a speed lower than the drawing speed, applying tension to the main tube in the opposite direction to the drawing direction, and drawing while heating the main tube immediately before the die inlet. 10: ? Outside of i? A die with an inner diameter smaller than L;
It has a tip carriage device that holds the tip of the qiII product that has been patterned and pulls it in the drawing direction, and in a drawing position where the drawing process is carried out while regulating the inner and outer frames of the product using the mandrel and die. , the mandrel inserted into the base 1'4 is drawn at a speed lower than that? A 7-drel feeding device that feeds in the drawing direction with J4, and a rear end carriage 'J' that grips the rear end of the main pipe and applies tension in one direction from the drawing direction.
A drawing device characterized in that it has zi and one eye. 4. A mandrel with a smaller diameter than the whitening of the main tube inserted into the main tube, a die with an inner diameter smaller than the outer diameter of the main tube, and a tip carriage device that holds the tip of the drawn d+'J product and pulls it in the drawing direction. In the drawing device # that performs drawing processing while regulating the inner and outer diameters of the product using the mandrel and die, a mandrel feeding device that feeds the mandrel inserted into the main pipe in the drawing direction at a speed lower than the drawing speed; Grasping the rear end of the tube, the drawing direction is 11! 1. A drawing device comprising: a rear end carriage device that applies tension in the direction; and a main tube heating device provided immediately before the die assembly.