JPS5954404A - Piercing method by piercer - Google Patents

Abstract

PURPOSE:To prevent the defective biting of a blank material and the formation of the defective inside surface of a blank pipe by specifying the ratio of the distance from the position where the blank material is bit between rolls up to the position where the material is brought into contact with a plug with respect to the diameter of the blank material. CONSTITUTION:The diameter of a blank material 14 under piercing with a piercer is designated as DB and the distance (grip) from the position where the material 14 is bit between rolls 11 up to the position where it is brought into contact with a plug 13 is designated as X. If X/DB is <=0.7, there is virtually no formation of internal surface flaw and if X/DB is >=0.3, there is virtually no generation of fast sticker. Therefore, X/DB is set at 0.3<=X/DB<=0.7.

Description

[Detailed description of the invention] The present invention relates to the drilling force method using a piercer.

The piercer is +ff11. ' As shown in Figure 1, D, 2I
II1. A barrel-shaped roll 11 of 1, a portion of the mandrel 12, and a plug 13 which is inserted into the HA.
Month 14 is 2'/i, L, and the function is to obtain 15 raw pipes. Now, the two rolls 11 are in the same force plane in the same series 111: II + ·, and their roll axes (j are oblique to the horizontal force direction il, +'l). Therefore, the element (414 is the roll 11Q) llr,, ・L rotating under the force action also moves forward in the direction of the ζζ axis force. Before reaching the tip, the roll 11R is subjected to continuous pulling and compression in the flat diameter direction, making the center part easily collapsing. After being perforated by the plug 13, the tube is rolled every half turn between the rolls 11 and the plug 13 in a furnace, resulting in a blank tube 15 with a relatively smooth inner surface.

In the conventional drilling force method 1 using a piercer, the minimum roll interval (gorge) E and the plug tip Hq hj (IJ-do) b from the gorge part to the entry side are determined by the roll of the piercer. 11, plug 13, material 14, elementary N・
lfl = 2 S, which is a mathematical relative relational expression for 15 frames.
2 (B −b ) tAIIψ+1).

(In the formula, S is the wall thickness of the perforated pipe 15, 13 (invalidity of the plaque 13, ψ (roll surface F4 of the hole 11111).
1) Pi; t is the plug diameter) and ii! It is set so that l<t and E=o, slB.

However, in the case of using the above-mentioned conventional piercing force method using a piercer, when the material 14 is bitten into the roll 11, the tip of the material 14 is scraped off, causing a so-called first sticker phenomenon. There is a risk that the process may become unstable and the production capacity may decrease, and the yield of finished products may decrease.

The present invention proposes the pore force method by T.I. and L. Bialy, in which the relative positions of the rolls, plugs, and plugs are set in a state that does not cause defects in the material's biting and the inner surface flaws of the raw pipe. , the purpose of the light is 4.

In order to achieve the above object, the present invention (a piercer according to ζ)
+4-1 of the drilling force method according to
(Grip) Xo) Ratio to material diameter DB X/IJB
or 03shiX/I)B≦07.

Furthermore, 5! by the piercer according to the present invention! The second one-hole method
is the minimum roll interval (gorge) 1 sound] and the amount of plug tip a from the gorge part to the entry side ('I-t) l), or 0.
3≦X/1)B≦0.7 (In the formula, DB is the diameter of the material 1N, is the roll face angle of large control, ψ2 (roll face angle of O-out 1, D is the plug diameter, B is the effective length of the plug, and S is the wall thickness of the drilled raw pipe). The settings are as follows: 1.

The present invention will be explained in more detail below.

FIG. 2 is an explanatory diagram showing the relative positions of the roll 11, the plug 13, the material 14, and the raw pipe 15 under the perforation by the via rivet. The diameter, The amount of advance (lead) of the plug 13, ψ1 is the roll face angle of the rule (
τ) - the inclination of the roll 11 in the body length direction7), ψ2 is the roll face angle of the equation 1, D is the diameter of the plug 13, and 13 is the radius 11111 for drilling the plug 13 and reducing the wall thickness.
i) Effective length consisting of +1 +NB 13 A and the tapered side surface +'+++ 1'I B for tube expansion, S indicates the perforated blank tube l 5 tri) ij4 thickness.

According to the findings of the present inventor, in the opening of via→1"-(ζ, 1.5), roll 11.!: Sokan 14.l+-
Increase the frictional force by increasing the contact area of 1~・f
In order to prevent the occurrence of the first speed detector, the following steps should be taken:
IA)+t+:+- It is good to take a large force from when it is bitten by the lever 11 to when it finally reaches the plaque 13. In order to prevent the occurrence of inner surface flaws on the raw pipe 15, the center of the material 14 (((near Rarely before; is plaque 13 (this trigram is n:g
;? l-It's a 1v match. 4, the distance from when the material 14 is engraved on the roll 11 until it is brocaded onto the plaque 13 is 9.

Figure 3 shows 11'D from when the material 14 is loaded one piece between the rolls 11 until it hits the plaque 13, and the ratio of tall
Inner surface ratio (A-ratio 1)' [This is a diagram showing a hermitage. This figure 3 C(yoi, +i, X/, 1.)R is 07
The following puns are /11' of inner criticism, raw (9t is recognized as being almost impossible.3shi<,7.,g kuto stay'
-′f! This is Figure 1. According to FIG. 4, it can be seen that if A+i-r, Therefore, in the present invention, X/I), 03≦X/J8≦0.7 −
fl)l This is what is set.

Next, the setting of the minimum roll interval (gorge) of 1 and the amount of plug advancement from the gorge to the entry side (lead) of 1) will be described in a more consistent manner based on the above equation (1). first,
Roll 11, plug 131. Good luck, material 1
4. Geometrical 1 (to 1 coefficient 1i of the raw pipe 15 to the following (
12) Equations 2 and (3) hold true.

1) B=E+2(X→1)) and 11ψ,
゛(2+E=28-2(口-b) し■ψ2 +D
, ・ (3) Above (2)
From formulas and formulas (3), formulas (4) and (5) are given by 7(1).

... (4) ψ1 in the above equations (4) and (5). ψ2It,
From the shape of roll 11, it is Daisen. 41tQ product J-shi dispute, 1 individual law is imitation of square 2, is the size of raw pipe 15? 7j has been decided, and from the monthly power ■ Nivas Gejur, S, l) p
,B, ,1), is determined. 4, <tte, l> / I) l, and 1) /Iノ, are fortune-telling X/
]:1B(7) function. Well, Beer 4 To Ichiban ζ
(J%X 0) iiψtose (ζ
More than 11 (+:.

bO) It is possible to explain this. Therefore, in the case of non-invention (well, +, ti, fixed off by the above formula (1)
, lJ,, il+lJ, enclosure'・6 tamedazli'l
/ DB, b / l) H, H7. Old, 1) person and rJ' (5) te (from 1 to itch, between the small rolls; 尭I
1), and a plug connection to the input side is installed 4).

The first drilling force method according to the present invention is based on the drilling force method according to the present invention. The ratio X/I)8 to %i4 (clip')XO) material diameter1) is,
03 ≦
+JSi Oki l without causing inner surface defects of the raw pipe.
(7. Determine, J:'/"'M ri) (t'-
, /, 1 le.

In addition, the second method of the drilling force method using the via→I- according to the present invention 1
1t, J Yu small roll interval (gorge) 1 and plug advance amount (lead) b from the gorge part to all I is 03
≦X / 1) lI - Kure ()7 (In the formula, 1) B is the diameter of the material, X is the distance (clip) from when the material is caught between L7-R until it hits the plaque
ψ1 is the roll face angle on the inlet side, ψ2 (1 out 1 [river roll face angle, D, i; J plug inner diameter, B is the effective length of the plaque, S is the flesh of the perforated raw pipe j9-) Add 78 to
By appropriately setting the plug position 1ith' with respect to the roll according to the hole conditions of the Soko shrine, the roll, plug and cumulative month Q month 1 and 1 position 1 night'' can be set as follows (7) Biting In order to ensure that there is no possibility of defects or internal defects of the raw pipe,
To be more specific, the effect of iJ]' lI is 6 years old.

[Brief explanation of drawings]

Figure 1 shows the back hole J method '2' -f:l
I break ji, 111-. (Fig. 1, Fig. 2 shows the piercer (1, 1, 1, 1, 2, 1, 2, 3, 4, 5, 4, 5).
11 Coordination II・i", 1'71'e Sutama Chill Diagram, 3rd
Figure (・Ma
-71- Figure, hood, Figure 4 is a diagram showing the gateposts of X/]8 and First Suditzkai 11 cow rate). 11 Roll, 13 Plaque, 14 Plain A1 15 Simple, X Clip, 1) B Monthly It11C-
1-shi, 1〕ri
−1・ , ψ1. ψ20 - face angle, D, plaque orthogonal, F; plaque oak length, S...4 pieces) 1ν. 111 people on behalf of Ben, 8! 10 Shio River 1) 2 Jidai 1
Figure 11 92Figure 01-X/D8 Go to Figure 4 0.10.20.30.40.50.60.7x/D.

Claims (1)

[Claims] (1) 2 pieces 0) In the drilling force method using via → Qi-1ζ, which perforates the material with a roll old plug, the distance 1 from when the material is bitten into the roll 11 old [il] until it hits the plaque is
Sister (ri 11 tube) Xo) material direct II D, lr ratio X/J). is set to 0,34 (su) 21 hard (halol and buburakuniyo 1゛(・,
(2
ζ16 [, Minimum roll interval 1'1' (Gorge) 1 bow"
, evening sun cone) tit J entry side plaque 'I'+
'i J(. ト')(Le-l') l) is o, 3
5 X / iJ,, Chicken 07 (In the formula, I) BLt material diameter,
′! l (clip), ψ1 is the input (roll face angle of ill, ψ2 is the roll face angle of the exit side, ■) P is the plaque straightness i￥=,
, ]-41i plaque's 41 effective length, S is the wall thickness of the drilled raw pipe) is set to 17 Jii, and f2' is the drilling force method according to the beaser ζζ.