JPS6049827A - Method and device for working drill edge of self-drilling screw - Google Patents

Abstract

PURPOSE:To reduce the burden of dies and to improve the service life of the dies by preliminarily striking a shaft body at least once or above with a pair of preliminary dies then finishing the same to the shape of a drill edge by a pair of finishing dies. CONSTITUTION:Dies 1, 1' attached to slide rams 2, 2' have two front head parts of the dies, one of which is front head parts 4, 4' of preliminary dies and the other one is front head parts 5, 5' of finishing dies. A shaft part 101 supplied from a chuting rail 7 fits into the recess 6 of a carrying dial 3. Head parts 102 are placed atop the dial 3 and are repeatedly rotated and stopped at an equal angle in the direction A to feed the body 101 to the position 101a between the parts 4 and 4' and to stop temporarily the same. The dies 1, 1' are then stroken to mate each other to form the shaft body 101 to the preliminary shape of the drill edge. The dial 3 feeds the body 101 to the position 101b between the parts 5 and 5' and the body 101 is formed to the perfect shape of the drill edge by the parts 5, 5'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a method for manufacturing a self-drilling screw and an apparatus for manufacturing the same.

Self-drilling screws, which have a drill bit at the tip of the screw, are widely used in the industry because they eliminate the need for drilling holes before tightening the screw and allow the screw tightening operation to be performed easily and quickly. In particular, many improvements have been proposed regarding the shape and processing method of the drill blade, but the processing method widely used today is a method in which the shaft of the screw is pinch-bointained or forged using a pair of dies. be. In this method, the unprocessed tip of the shaft is positioned between a pair of dies, and the dies are once aligned r1, thereby completing the shape of a drill blade on the shaft. However, it has been pointed out that this method has the drawback that the shape of the drill bit is unstable and inaccurate due to variations in the material of the shaft body and surface condition, etc. The die was worn out and it was impossible to use the die for a long time.

The present invention improves these drawbacks, and provides a method and apparatus for processing a drill bit for a drill bit, which extends the life of the drill bit and forms a drill bit with a more accurate shape at the tip of the 11+ body. The purpose is to

Hereinafter, one embodiment of the present invention will be explained based on the drawings.1. FIG. 1 is a perspective view of the drill blade machining device of the present invention, in which the phase 7
= A fantastic die ill tlJ provided for J ~ and a slide ram (21 (2
1' and the die (11FIf) are rotated by two parts, and the shaft body (
gear ring dial (3) that moves the
and has. This device is the same as the known drill blade machining device that uses a pinch bore ink or a forging die, and the carrying dial (3) rotates and stops, the die +11 uf is struck, and the tool is pressed.
The movement of opening and rotating the carrying dial is repeated. Slide ram (21 (21'eC)Dice (11 (11') is approximately U-shaped with two dice fronts. One of the dice fronts is The front part of the spare die (4) (4f), and the other one is the front part of the second die (51 (5r).

The front parts of both dice (4) and (5) and (4 and 5)
...is equal to the interval between.

(7) is a shaft body sinking rail, and the shaft body (101) that will be supplied from this is fitted with the four shaft body holding parts (61K) of the carrying dial (3), and the head (102) of the shaft body (1013).
You can feel that it is held on the top of the carrying dial (3) so that it can rotate freely. Further, in order to completely hold the body, a kite plate (not shown) is applied to the side of the +l+1+ body (101) and the upper surface of the head (102).

The gearing dial (3) sends the shaft body (+01) toward the die by repeating equal angle rotation in the direction of the arrow and stopping. By rotating the key\' ring dial (3), 1 Tsukuda (101) is placed in the position of the die (101a) between 41
), and the rotation of the dial (3) is temporarily stopped.

Then, the arrows (BI
By sliding the VC in the O3f direction, the slide ram (
2) (Dice attached to 21'(11+11'
1J are combined, and the rough preliminary shape of the drill blade is given to the shaft body of (401a) by preliminary die front part (41+41'). Next, die (11 (11') is the ram base (81 (81' movement) is opened, the gearing dial (3) rotates, the tlib body (101) is finished, the front part of the die (the die ladle position between 51+51 (101b)
) [Forward, the rotation of said dial (3) stops again. Then, the 2mu base (81 (87) slides and the die (1)
The field is closed, and the front part of the tithe die (51 (from 51Vc (+DH・sha position V), the complete shape of the drill blade is shown) is 1 degree. Then, +11+ body(
101) is moved by a gear ring plate,
Sent to the next process.

Figure 2 shows the advance (iii
This is an enlarged perspective view of the i-guis forehead (41 (4r). Carbide tool steel or the like may be used as the material of the die.

1,000 (1ifi dice front part (4) and (4) are of the same form, and Q (11) are taken in the opposite relationship.

Jin no Yo (rift die frontal part +41
The formation of the convex part F2 (13+1) is broken.This first convex part (121+12 is a vertical straight surface (14)
1' and inclined surface (151 (15+'t)
Recording depression (11) (lfi,!l: Tice top +1I
ll % iTi'i (16) The boundary line with f+ef +171 +Iπ is a gentle sine curve from the second convex part f131 (131 to the first convex part 021 (1).The second convex part f13 ) The protruding surface t18 of FIf (181 is formed in the vertical direction.
18+ (Second part of 18f + 19) From +19f, the boundary line (1η (K to 17T) gently slopes and sinks into the first convex portion t12) +121. Prominent i'ni +181
flBr tD lower ff1l(201(21T U
Hollow (Ill (11rO center 11111 direction 11C
(first protrusion 121 at 2rl)
+12f front f15) (It is the same as 15γ.

As shown in FIG. 5, the frontal parts (5) and (51) of the finishing dice have the same form, and are formed in a relationship that is oriented anti-7J. 5), the same depressions 1311 t311' are formed vertically, and the hollow C11l (31) has a shearing part +321 on both sides.
+32 and the tip part (33) are formed. This tip part has a vertical] 11 line blade (3 (a) Q4r and an inclined blade + a5+ (*).The blade provided on the tip part low on one side protects the material during forging of the drill material. Cut element +2.Tip part +a31t
m beam q section (321') is made to protrude more than above.
) (Draw a sine curve from the story to the tip part +33 + m.IJ!I section (321 (32I tv)
Projecting surface (381 (38f +1 upper part (4) 1 (4
Part 1 from II (42) There is a depression o towards f42r.
It extends slightly obliquely and vertically in the direction approaching the central axis direction of n + 3 + 1'.

-1' m (42) (421' tri flu
Mi (3) I C311' center ill direction [M is oblique. The arrangement of this protruding surface +381t, v determines the arrangement of the lino cutting surface of the drill blade.Protruding surface (38) (38
The lower surface of r is formed into a wax shape that is flat and extends in the vertical direction.
This wax shape creates an appropriate rake angle on the cutting surface of the drill bit.
I can do it. Projection surface - F part (4"ZI IQ' is the tip part +331 +33f) M Oblique blade (35) (351,
! : Common [, ToIJ yb Blade (D Determine the shape of the tip tapered part. The outer surface of the rift section 132102f (39
)+3!11 H Frontal back wall+401t4or has a surface formed at right angles, and on the other hand, the concave side has a protruding surface (381
(From 381', it sinks along the boundary line and reaches the tip Miyakoda σ side. , the vertical straight blade +34+"m is the downward and inward inclined blade (35) t35j< recessed, and these vertical straight blade +34+ (34f and the inclined blade (35)
) There is a recess in the t end (blade width towards 311c++f (44+
+441 is formed, and the inclined blade (35)
(1σ line blade (45) (45r
is provided.

Next, one culm in which the A and D shaft bodies (101) are processed according to this embodiment will be explained with reference to FIGS. 4 to 10. Figures 4 to 6 are II-plane views of the shaft body, and Figures 7 to 1 are views of the shaft body.
FIG. 0 is an enlarged end view taken along the line C--C of the processing step of the +111 body shown in FIG. 4.

Figure 4 shows an unprocessed A and D shaft body (101) with one head (
102) and a shaft portion (103). This shaft (10
1) may be annealed first. Annealing 1-1 gives sufficient ductility to the metal and gives good results in subsequent processing VC0 As shown in FIG.
! In order to carry out the preliminary addition XL to the end of l), the end of the shaft (103) is placed between the opened preliminary die front part +41 fJ. Next, as shown in FIG.
It is closed with a first gap of mm. The full flexion of the shaft part (103) is the front part of the preliminary die (41 (4, 1),
The deformation of the joint is most often carried out by the second convex part (13), and the vertical groove (1
04) has a shallow formation field. (See Figure 5). In addition, the 8th
Although not shown in the figure, the second convex portion +131 (the lower part of 131) and the first convex portion (the inclined surface of 121Tlff
(11 indicates the approximate shape of the tip tapered portion (105) of the drill blade.

The excess cumulate passes through the space between the front part of the preliminary dice + 41 fa and escapes to the outside, resulting in BaIJ (106)...

The shape of the pre-(1iii drill blade is +1111 parts (10
The shaft body (jQl) formed at the end of 3) is as shown in FIG.

- Opened Tithe” - Gedais frontal part (5+ [5r interval Vζ
placed.

At this time, it is desirable to accurately adjust the angle between the front part of the die (51) and the end of the shaft (103) that holds the preliminary drill blade shape. Even without the shaft (10i), as described above, the shaft (10i) is rotatably held by the shaft holding recess (6) of the carrying dial (3), so that the front part of the finishing die +51 +51'
O closed joint Ceno initial VcIIIl1 body (106) rotates naturally and dice can be struck at an appropriate angle.

Next, as shown in Figure 10, cut the front part of the second die (5) (5
The door is completely closed. I] Further move the protruding surface of the q section (321 (32r) (381 (38r is the shallow vertical recess 104 formed at the end of the moving part (103)) to complete the cutting surface of the drill blade. (107). The land (108) of the drill bit is formed as !J'J section (32) (3
Recess from the protruding surface (support) of the force to the tip +3+ +aar='h (15 due to the curve of 311t311')
available. Since this curve is close to the circumference of the shaft body (d), the movement of the metal moon on the surface (108) is caused by the cutting surface (108).
07). In addition, the tip cheek f [105) of the drill blade (the shape of the three pieces is S/J section -F' 61L f421 (4
From 2f to the tip part (33Y-o inclined blade (35) (35r
When the die is completely closed, the recess (311 (3+1') is recessed by the inner surface of ICit, 411.1, and the corresponding chip part OJ
Take 1 cut part (37f and tip part +331'
& shearing part (32) may be arranged to meet each other, but in this embodiment, the corresponding two parts (summer and (37f) and +331 and (32) are slid together. As shown in the figure, t<, f Horn part Cl31
(D m +ri 1?j g blade (341&:I:
, 'c blade width (44), Q'J cutting m (3
21tv upper WJ (4fi) outside full11 side tB
Similarly, the vertical straight blade of the tip part f331' (3ζ is the shearing part (3ζ) by the blade width 1441'.
It slides into the outer surface (39r) of the upper part (41) of the company.Although not shown, the inclined blade (35) of the chin part and d and (
35F is the blade width (44) and (44Y division, Q'
J danflB (32r&hi(321O-F n'B
(471M Hi (421 outside surface (3 fertilizer and +391
Slide in 1'. As a result, the 9J cutting edge (10
8) becomes sharper, and the cutting edges of the tip (110) in the tapered tip portion (105) are twisted together.

1q Heddled blade (4FA I451 has a tapered tip (+05
) Bisect the paris (106) at the O cusp (110). (106)Q, 1.Although it may be separated at this stage, it may be removed after being engaged with the processing means in the thread processing step after forming the drill blade.

FIG. 11 is a perspective view of a drill blade machining device according to another embodiment, in which the shaft body (101) is moved by a chain drive system. The shaft body is locked by the Ib body holding recess 5J carved in the link play (521) of the chain 61), and is moved by the rotation of the chain gear.
101), the front part of the preliminary die (55
) - and A'' raising die front head (field tt+ distance [equal. Both sides n1j head (audience) (go) and land) 5η (57r and (58) μsT. These dice (5
7) +59'+581 f581' is attached to a pair of slide rams t591 (59r U, row 11) and can be opened and closed from the sliding holes of the ram bases (60) (60)'. It is also possible to attach it to a pair of ram bases as a pair of dies and finishing dies.
It is also possible to consider setting it to 4.

The shaft body (4o+) is in the shaft body flow lane 1. +611 causes chain 1 related to one chain tooth it +541
511 'C is exhausted and moves linearly between the front parts of both dice. Therefore, the shaft body (101) is the preliminary die front part (551f551'7-]ge die front part 15G+
1511i1' to A1j.

Therefore, as in the first embodiment, 11111 bodies (101
) and the front part of the finishing die (g). There is no need to adjust the angle between it. Note that this embodiment is also not shown in the drawings.

As appropriate, a kite plate is provided opposite the shaft body t.

The shapes of the front part of the die (#ii) (551 (55T) and the front part of the finishing die +561 +56f may be the same as in the first embodiment, but the worn out I1-up die is used as a spare die. You may.

Note that the shape of the front part of the die is not limited to the first embodiment, and may be changed depending on the shape and material of the drill blade Aq vc. For example, corresponding to the formation location of the dolino blade,
-1111 Only the end VCg groove may be formed,
Alternatively, the cross section of the shaft may be changed from a perfect circle to an ellipse.

Bar L) UC, Ding' (lift Tice 2J saw 1-
The shape of the drill bit may be approximated to the shape of a drill blade that has been completed one by one in the shape of the 111 body.

The present invention is based on the predetermined dice] 1st place 1δCCll
A preliminary process consisting of sending 11 pieces and forming a preliminary shape of a drill blade at a predetermined location of this shaft body using a pair of spare die front parts, and performing 2 pieces at least 1 time.
Next, place the finished shaft body on the next die 4J (l).
Self-trilling, which consists of a step of finishing the preliminary shape of the drill blade of the shaft body into a complete drill blade shape at the front part of a pair of (, 1 knee-l) dies; In addition, there is an apparatus for carrying out the method, comprising: at least one pair of opening and closing preliminary dies for forming the preliminary shape of the drill bit at the appropriate location on the body.
5, and a pair of cutting dies Of i7i' for perfecting the preliminary shape of the drill bit formed on the shaft body.
i lit and fi! iii. Drilling of the seven run link screws to provide means for sequentially moving the shaft body from the preliminary die position to the finishing die position 11. The device YfiM is provided. Therefore, the present invention (!;
Rather than completing the drill bit of the J-Russel Ring in one die, it is necessary to prepare it at least once.
ii Since it is necessary to perform 4'Jchi, the shape of the completed Drino blade should be more accurate.
In order to complete the drill bit with the die of ``J')'', one die should be moved: metal holo of Ulj body (J
The cost is half that of the conventional one, and the burden on one evening is small, making it possible to dramatically extend the period of use of the Tainu. Moreover, since the pre-processing and finishing processes can be performed continuously, the time required to process the drill bit is almost the same as before.
A method and apparatus capable of increasing the speed of drill blade machining can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a drill blade processing device according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the front part of the die (1iii).
Fig. 6 is an enlarged view of the front part of the cutting die, Figs. 4 to 10 show the second process of adding the drill bit, and Figs. It is a front tooth, and the machining of the drill bit is
7 to 1D show the machining stages of the shaft body in FIG. 4, Q-CIfj! This is shown in an end view. FIG. 11 is a perspective view of a drill blade processing device according to another embodiment. )...l111 bodies, (105
)...Shaft part. 2nd 18' ] n %

Claims (1)

[Claims] ■ A preliminary method comprising the step of sending a shaft to a predetermined die striking position and forming the preliminary shape of a 1J drill blade at a predetermined location on the shaft using a pair of preliminary die fronts. The targeting process is carried out at least once, and the first pre-drilled shaft is sent to the next die punching position, and the preliminary shape of the drill bit of the shaft is completed with the front head of a pair of finishing dies. A self-drilling screw drill blade processing method that consists of a process of finishing the blade shape. At least one pair of opening/closing die front parts, which can take on the shape of a drill blade (11ii), are placed in an appropriate η location on the body, and the preliminary shape of the drill blade formed on the shaft body is completely completed. Drill blade machining of self-drilling screw to create a means to sequentially move the body from the preliminary die ladle position to the finishing die punching position K111. Device.