JPS5825839A - Formation of flange for part with flange - Google Patents

Abstract

PURPOSE:To form flanges of high accuracy with a less number of processes by cold pressing one end of a blank to a diameter smaller than that of the other part and flaring the circumferential edge part in the small diameter end part outward. CONSTITUTION:A blank 1 is made by cutting a wire to a prescribed length. The blank 1 is placed under the 1st punch 6, and is forced into the 1st die 7 by the punch 6. Since a small diameter part 8 is formed in the die 7, the blank 1 is cold-pressed to a small diameter part 10 and a large diameter part 11. The blank 1 is turned over to position the part 10 upward, and is disposed below the 2nd punch 12, that is, above the 2nd knock-out pin 13. When the 2nd punch 12 presses the blank 1, the centeral part of the part 10 is recessed and the circumferential edge thereof is forcibly flared along the shape of the die 15, whereby a flange 16 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a flange on one end of a semi-finished product or blank using a heading machine.

Conventionally, when molding parts such as rivets, nuts, bolts, etc., wire is cut to a predetermined length to create a semi-finished product, that is, a blank, and this flank is passed through a pair of dies of a heading machine with one end protruding slightly. and hold the protruding end.
A method of forming a 7-lanzo tube by forging by 1 inch is known. Although this 7-lunge forming method has the advantage of requiring fewer steps, it is not preferable in that the deformation of the edge of the blank during cutting is directly reflected in the 7-runzo shape, making it impossible to obtain a flange with an appropriate shape. .

In order to form a 7-lunge with an appropriate shape, the trap and blank are held in a protruding die, and the circumferential edge of the protruding end is held by a 12-/4-inch periphery to form a circular shape and the deformed part is shaped. 7-Ranzo molding is known. Method 4 is preferable because the number of process steps is not large and the flange is not affected by the deformed part, but if a small 7-lanzo is required or if hole drilling is performed at the same time as flange forming, the metal flow to the flange may be Since the required amount was large, the part just below the flange was broken.

There was 1 g of missing thickness on the flange.

To solve this problem, there is a method in which the protruding end of the blank without a deformed portion is pressed to some extent between the first heading process and the first heading process 0, and one preforming process is performed. In addition, in a similar method, there is a 4-hour (D) method in which flanges are gradually formed into several parts of the tube during the Fukunji forming process.These methods can produce flanges with high precision, but the number of steps is large, and heading is difficult. Apart from the above method, which increases the number of machine stages, increases machining time, and increases the price of the part, a chain that wraps around the blank is pre-formed and inserted into the tube, pushing the edges of the blank apart. There are 7 ways to form lunges.

In this method, the accuracy of the second angle depends on the degree of tube ON, so the key to obtaining a highly accurate flange is the precision of the tube end! There is a need to finish IK.

be. Moreover, the outer appearance of the 7-kunji molded by this method was not desirable.

Accordingly, an object of the present invention is to provide a method for forming a flange with high precision using a small number of steps.

In order to achieve such an object, the present invention provides a method for manufacturing a flanged part in which a flange is made by cutting a wire to a predetermined length, and the shell blank is sent to a heading machine to form a flange at one end.
In the lunge forming method.

A first step in which one end of the planter is formed to have a smaller diameter than other parts.
A method is provided which is comprised of a forging step and a λ-th forging step in which the peripheral edge of the small diameter end of the flange is expanded outward to form seven flange. The 72-lung forming method of the present invention requires only 1.2 heading steps, so the time and cost for 7-lung forming is not increased. In addition, the blank end was made smaller in diameter than the other parts in the first heading machine,
Since the deformation at the time of cutting is shaped, the shape becomes highly accurate and round, and the 7 runs made in the λth forging process also have high precision. In addition, even when forming a /h7 runzo or machining a hole and a hole at the same time, the small diameter end has a high degree of roundness, and the metal flow is smooth, and the metal flow is smooth just below the t-shaped flange. No O-rupture.

According to an embodiment of the present invention, it is preferable to invert the flange when transferring from the first heading process to the first heading machine, and from this K, the small diameter end tΔ which is shaped in the first heading machine 1i and has no deformation. It can be easily expanded with a punch. The small diameter portion may be 4D with a chi Δ relative to the large diameter portion, or may be 4%O with a step.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, ^ and B both indicate the 7-tunge forming method for flanged parts according to the present invention, and 11
Figure 12 is the 1st r! The details of the molding method in 4^ are shown.

In the t1 process in Figure 1, the wire is cut to a predetermined length to produce a semi-finished product, ie, a blank 1.

That is, in FIG. 2, a wire 3 supported by a chuck 2 is cut to a predetermined length by a knife 4, thereby producing a blank 1. This blank line 1 has a deformed portion 5 which is not a right circle at one end as shown in Figure 1 (a) and (4). undergoes the first heading process according to the process recommendation.

In the first heading step, the end of the blank 1 is shaped so that the deformed portion 5 thereof becomes a perfect circle. That is, in FIG. 2, the flange 1 placed under the first pa/chiro is
It is pushed into the first die 7 by the Nodanchi 6. This die 7, when plastic/li 1 is pushed into the whole,
A small diameter portion 8 is provided downward from an appropriate position so that the lower end of the flange 1 has a small diameter. Planta 1 Shimomensha,
It is in contact with the seventh knockout pin 9, and the d edge 6,
The planter is shaped by the bin 9 to have a small diameter part 10 at the lower end and a large diameter part 11 at the upper end. That is, the deformed portion 5 at the end of the planter is shaped into a small diameter portion with high roundness, and there is no deformed portion.

In this first heading process, the first Nonan Chiro
As it enters the mace, the diameter of the entire planter 1 increases, but in this case, the small diameter part 1 of the blank 1 is first
0 is formed and then the large diameter portion 11 is formed, so there is an advantage that the forging force may be low.

The diameter of the small diameter part 10 made in the first heading process is the wire 3
The diameter of the wire may be smaller than the diameter of the wire, but in order to reduce the load on the die 7, the diameter of the wire is preferably equal to or slightly larger than the diameter of one wire. As an example, if the wire diameter is t, the length is 0. / ■ Largely formed. Further, it is desirable that the length of the small diameter portion be as short as possible within the range that the lIl-shaped portion of the planter can be shaped and removed in the first forging process, and is set to λ■ as an example.

Next, the diameter of the large diameter w611 is made larger than the wire diameter and the diameter of the small diameter part, but it is desirable to keep it within a range where the deformed part 5 of the blank can be shaped and removed, so that an excessive pressing force can be avoided. For example, O from the diameter of wire 3
0hiro■ Made it bigger.

Process (2) Expansion: When transferring from the first forging process to the second forging process, the planter i is inverted using a finger chuck or the like, and the small diameter portion 10 is positioned upward.

The inverted blank 1 is placed below the 2/4 inch 12, that is, on the second knockout pin 13. The second/mother punch 12 has a protrusion 14 having a smaller diameter than the small diameter portion 10 of the blank 1 at its tip, and the end face of the second die 15 is tapered (FIG. 1A1 FIG. 2). Therefore, the 2nd/4th
When the punch 12 presses the blank 1, the center of the small diameter portion 10 is depressed, and its periphery is expanded along the shape of the die 15 to form a flange &16.

This 7-tunge 16 is preferably made with high accuracy because the small diameter portion 10 with high roundness is formed. In addition to the high roundness, the difference between the large diameter part and the small diameter part can be reduced to a value of 0.3 (in the above example), so that the metal 70- is smooth and the 7-tsunji will not break.

79 The tsutsunk 1 with an edge can be moved further for larger processing, etc., but since it is a well-known method, the explanation will be omitted. has a chi 2 part 17, and the tip of the planter 1 is tapered.
The molding method shown in W^ and FIG. 2 is the same.

In this case, the wl diameter of the tip with the tip d may be made equal to ** of the small diameter portion 10 shown in the first [^ (Fig. 2) K].

4.1 Ilf's simple tsta The first part and the second part are explanatory diagrams showing the 7-tunge molding method according to the present invention, and the second part is an explanatory diagram showing the method of Fig. 1.

10...Putsuri% * ”...Chuck, 3...
... wire, 4 ... knife, 5 ... deformed part, 6 ... first punch, 7.7' ... first
Dice, 9... 1st knockout bin, 10...
...Small diameter part, 11...Large diameter part, 12...2nd notch 9 inches, 13...2nd knockout pin, 1
5...2nd die, 16...Fist Franzo,■
... Cutting process, ■... First heading process SN.
...First heading process.

Claims (4)

[Claims] (1) Cut the wire to a specified length to make a blank,
A flange forming method for a flanged part in which the blank is fed into a heading machine to form a 72 inch at one end, a first heading step of forming -fI14 of the flank to a smaller diameter than other parts, and a small diameter end of the flank. and a first forging step of expanding the peripheral edge of the section outward to form seven lunges. (2) The method according to item IIg (1) above, wherein the blank is reversed between the first heading step and the second heading step. (3) The method according to item rx) 1, wherein in the first heading II, the small diameter part is formed so as to have a step at the boundary with the large diameter part. (4) In the first heading II, the small diameter part is formed so as to form a chi/4 from the end to the large diameter part.
) method described in section.