JPS5823807B2 - Method for manufacturing flanged rod-shaped body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a flanged rod-like body, and is particularly suitable for forming a flang on a rod-like body made of a high-grade material such as carbide, such as in a punch for press working. Relating to a manufacturing method.

Methods for forming a flanged rod-like body include forging or cutting, but the former has poor workability, and the latter is not economical as a method for processing high-grade materials.

Another method is to connect only a separately processed flange to a ready-made round bar.

Methods for directly joining two metal members include press-fitting and caulking.

As is well known, the Tamairi method has a limited strength and is particularly vulnerable to impact.

Furthermore, in the case of a member that does not elongate, such as cast iron, it has the disadvantage that the required strength cannot be obtained.

In the caulking method, there are material limitations for the members to be caulked (materials with low deformation resistance).

Therefore, it is not always possible to obtain optical coupling strength regardless of the material composition (cast iron, etc., is not possible).

Furthermore, if there is a large difference in the thermal expansion coefficients of the two members to be joined, the bonding strength may be significantly reduced depending on the operating temperature conditions.

Furthermore, as a method for directly bonding other members to a rod-shaped body, the method shown in FIGS. 1 and 2 is also known.

That is, a hollow disk 9 is provided at the stepped portion of the shaft 1, which is a rod-shaped body.
This is a method of directly joining.

The shaft 1 is provided with a groove 1a.

When joining, as shown in FIG. 2, the convex portions 3a,
The upper and lower molds 3 and 4 having 4a are used to press the end of the disc 9, and the joint part of the disc is bitten into the groove 1a of the shaft.
This is a way to obtain bonding strength.

However, in this method, as shown in the figure, a portion of the disk does not completely dig into the groove 1a, resulting in a gap δ.

In other words, since the deformation resistance in each part of the disk is equal,
Even if the edge of the disk is pressed with a mold and a stress σ3 is generated in the circle,
This stress causes deformation of the disk end face and outer portion, which are less constrained (Fig. 3).

This is because it is not possible to locally generate stress large enough to cause light plastic deformation only in the groove portion.

There is also a method shown in FIG. 4 as another method.

That is, an annular groove 1a is provided in the shaft 1 in advance, and an annular protrusion 6 is provided in the collar 2, and the protrusion is inserted into the groove under pressure to plastically deform the protrusion and press it against the surface of the groove. It is something.

This method requires that a head 1b be formed in addition to the groove 1a on the shaft 1, and that a protrusion 6 be formed in correspondence with the groove 1a.
Workability is poor in that it must be processed in advance, and sufficient bonding strength cannot be obtained.

An object of the present invention is to provide a method for manufacturing a flanged rod-shaped body with high precision, excellent workability, and economic advantage.

A feature of the present invention is that a concave groove is provided on the outer periphery of the rod-shaped body, a flange member made of a material with lower deformation resistance than the rod-shaped body is arranged on the outer periphery, and the flange member is cold-pressed and plastically deformed in a sealed restraint state. The purpose is to allow the metal to flow into the groove and join together.

The present invention will be explained in detail below.

FIG. 5 shows the external appearance of the flanged shaft, in which a flanged 20 is fixed to the head of the shaft 10.

As shown in FIG. 6, an annular groove 11 is provided in the shaft.

On the other hand, the collar 20 has a hollow part 21, the diameter d' of which is slightly larger than the outer diameter d of the shaft 10, and d'-d=0.05 to 0.
．． It is desirable to set it to about 1 (mm).

The material of the shaft 10 has a high hardness.

S.U.J. SCM3, SCM2, DAC, vise, carbide, etc.

On the other hand, the material of the tsuba 20 is stainless steel, mild steel (SIOC
, SCM21), etc.

Fig. 7 and Fig. 8 show the state of processing.

In the figure, 40 is a die, and a female piece 50 is arranged in the hollow part of the die to hold the shaft 10.

Reference numeral 60 denotes a shaft stopper which can be slid within the large die diameter hollow portion 41 by a female piece driven by a hydraulic cylinder.

The upper part of the female piece 50 becomes a small-diameter portion 50, which can slide within the small-diameter hollow portion 42 of the die.

A punch 30 has a hollow portion 31 with a diameter slightly larger than the outer diameter of the shaft 10 (one-side gap g=0.05 to 0.1 mm) and a protrusion 32 .

During processing, the collar is restrained by the die 40, the female piece 50, and the shaft 10, and only the upper part is opened.

Then, when pressurized with the punch 30 from this open part,
A portion of the collar member flows into the groove of the shaft.

The amount of movement of the punch during pressurization is approximately 1 mm, and the load is 180 kg/ma when the flange material is stainless steel, and 1 when the flange material is made of stainless steel.
It is best to set it to about 50 kg/-.

In order to improve the flow of the collar member into the groove 11, it is necessary to select appropriate values for the inclination angle θ between the groove ends and the groove width.

θ is preferably about 10° to 30°.

If θ is small, it will be difficult to flow into the groove, and if θ is large, the axial removal force will be reduced.

Figure 9 shows the relationship between the groove width, extraction force P, and groove depth S. The material of shaft 1 is 5KH9, and the material of collar 2 is SUS.
It is 403.

and d = 12mm. When D=18 mm, the groove width is preferably 2.0 to 4.5 mm.

Since the outer diameter of the shaft is relatively small, if the groove width is too small, the flange will easily deform.

On the other hand, as the groove width increases, the load for pressurizing the flange increases, but on the other hand, the rate of increase in the extraction force decreases as compared to an increase in the groove width.

Therefore, b is preferably about 2.0 to 4.5 mm.

The larger the depth S is, the better, but if it exceeds a certain level, the notch effect becomes large and the shaft becomes weak.

Therefore, S is preferably about 0.25 to 0.5 mm.

As shown in FIG. 10, some flanged shafts have a flang at the middle portion of the shaft, and the present invention can also be applied to this case.

According to the method of the present invention, almost no stress in the axial direction is applied to the shaft when the flanges are connected, so that a highly accurate flanged shaft can be obtained without causing any bending of the shaft.

In particular, for parts whose shafts are made of high-grade materials such as carbide or high-speed steel, and pins related to molds, the effect is remarkable in terms of material cost and accuracy compared to cutting and polishing.

Furthermore, the material diameter of the shaft can be selected regardless of the collar diameter, so if the rod diameters are made the same, you can simply cut the long rod to the required length.In other words, you can measure the dimensions without cutting the shaft. becomes.

Therefore, it becomes easy to standardize the material, and furthermore, it can be stored in a hardened and polished state, so that workability can be improved.

As a result of applying the present invention to die-cast core pins, 4
In a life test of 10,000 shots, there was no wobbling at the flange joint.

(The shaft of the test material is high-speed steel hardened, HRC52
, the collar is made of stainless steel.

) As described above, according to the present invention, it is possible to provide a method for manufacturing a flanged rod-shaped body with high precision and excellent economy.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventionally known method for manufacturing a flanged shaft, FIGS. 2 and 3 are diagrams showing details of the state of material flow in the method of FIG. 1, and FIG. It is a figure showing a publicly known example. Fig. 5 is an external view of a flanged shaft according to an embodiment of the present invention, Figs. 6 to 8 show its processing method, Fig. 6 is a diagram showing the state before coupling, and Fig. 7 is a diagram showing the state before coupling. A diagram showing the state, and FIG. 8 is a diagram showing details of the main part. FIG. 9 is a diagram showing the effects of the present invention. FIG. 10 is an external view of another embodiment of the present invention. 1...Shaft, 1a...Groove, 2...
...Tsuba.

Claims (1)

[Scope of Claims] 1. In a method of manufacturing a rod-like body having a flange, an annular groove is provided on the outer periphery of a rod-like body made of a metal material, while a material having a lower deformation resistance than the material of the rod-like body and on the outer diameter of the rod-like body is provided with an annular groove. A ring-shaped flange member made of a metal material having approximately the same inner diameter is formed, the flange member is arranged corresponding to the annular groove of the rod-shaped body, and the outer periphery and bottom surface of the flange member are hermetically restrained with a mold, and used separately. A flanged rod-like structure, characterized in that only the upper surface of the flanged member is cold-pressed by a punch to plastically deform the flanged member, and a part thereof flows into the annular groove of the shaft to join the flanged member and the rod-shaped body. How the body is manufactured. 2. The method for manufacturing a flanged rod-shaped body according to claim 1, wherein the depth of the annular groove is in the range of 0.25 to 0.5 mm. 3. The method for manufacturing a flanged rod-shaped body according to claim 1, wherein the rod-shaped body is made of a punch material such as high-speed steel or carbide. 4. The method for manufacturing a flanged rod-shaped body according to claim 3, wherein the flanged member is made of stainless steel.