JPH0481274A - Production of magnetic shielding parts of electromagnetic clutch - Google Patents

Abstract

PURPOSE:To improve the reliability and safety of parts by working a U groove of a specific width on a steel disk, welding this groove as a bevel groove by MIG welding using a consumable type electrode for stainless steels and executing a welding procedure to the size of the surface height of the final layer lower by a specific value than a base metal. CONSTITUTION:The narrow groove of 9 to 11mm width is formed as the groove to be formed for MIG welding of the steel disk. The welding is executed on one pass per layer in this groove by using JIS Y309 or Y309L as the consumable electrode for stainless steels in such a manner that the height of the final surface of the weld metal is lower by >=1mm and <=3mm than the surface of the base metal. The magnetic permeability necessary as the magnetic shielding parts is not obtainable with Y308 and Y308L which are relatively low in the content of Ni and Cr or Y316 and 316L contg. Cr at a lower ratio and contg. Mo. The nonmagnetic part which has sufficient joint strength and has the stable and low magnetic permeability is provided in a part of the steel disk of the magnetic shielding parts in this way. The reliability and safety of the magnetic shielding parts are thus greatly improved.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for manufacturing a magnetic cutoff component for an industrial electromagnetic clutch, and more specifically, a method for providing a non-magnetic portion having stable and low magnetic permeability in a part of a steel disk (magnetic material). Regarding the method. (Prior art and problems to be solved) The rotor, which is the main component of industrial electromagnetic clutches, is a steel disc (magnetic material) with a non-magnetic part in part to block magnetism and function as a clutch. retains functionality. Conventionally, there are the following methods (1) to (3) as methods for manufacturing this magnetic shielding component. (1) A method of machining concentric grooves on a M-made disc, inserting a ring-shaped stainless steel therein, and then brazing in a vacuum or atmosphere using a brazing material such as copper brazing (first method). (see figure). (2) After cutting concentric grooves on a steel disk and inserting a ring-shaped stainless steel therein, the joining surfaces of the steel disk and stainless steel are integrated by electron beam welding or laser beam welding, and then , a method of removing the unwelded part at the bottom by machining (see Figure 2). (3) A method in which V-shaped grooves are machined in concentric circles made of steel, and the grooves are filled with weld metal by multi-pass arc welding using consumable stainless steel electrodes (see Figure 3). However, these methods had the following drawbacks. ■The strength of the brazed portion varies greatly depending on the dimensional accuracy of the fitting, the placement method of the brazing material, the temperature for brazing, the time for brazing, and minute changes in the atmosphere for brazing. For this reason, the strength of the brazed parts is often unstable, resulting in poor reliability as a clutch. (2) Therefore, the accuracy of these variable factors must be particularly strictly controlled, and the machining accuracy of materials and the control accuracy of brazing equipment must be extremely high. ■The cost of machining stainless steel, which is a difficult-to-cut material, into a ring shape is high. ■Brazing requires batch-type work, which is less efficient. Therefore, it is not suitable for mass production. ΩB directly above the gap■ Since the welded part is welded to stainless steel and different materials, the chemical composition of the weld metal changes depending on the beam irradiation position, which may cause defects such as cracks, and the strength of the brazed part is unstable. ■In electron beam welding and laser welding, for example, 0.5m
Since the beam is irradiated with a small spot of about mφ, if the gap between the grooves of the ring-shaped stainless steel and the steel disk is larger than this beam spot, the beam may pass between the grooves and welding may not be possible. be. ■In order to prevent these problems, the machining precision of the groove and ring-shaped stainless steel must be extremely high, which increases costs. ■Even if the groove processing precision is extremely high, if the beam spot is not irradiated there, good welding will not be possible. Therefore, a sophisticated positioning mechanism is required to match the groove position with the beam spot irradiation position, which increases the cost of the welding apparatus. ■Cost is high because stainless steel, which is a difficult-to-cut material, is processed into a ring shape. ■The initial cost of welding equipment such as electron beam welders and laser welders is extremely high. ■Since electron beam welding is usually performed in a vacuum, the work is done in batches and is less efficient. This is a method of overlay welding using a consumable electrode such as covered arc welding, gas shielded arc welding, submerged arc welding, etc. in the groove that has been processed with a Ω-cutting machine, so it is not suitable for general stainless steel welding. Materials can be used, arc welding equipment can be used for welding, and construction is relatively easy. However, since the inside of the groove is welded in multiple passes, if the welding method and welding conditions are inappropriately selected, a large amount of iron (Fe) in the steel disk, which is the base material, will enter the weld metal, resulting in welding. Cracking occurs in the metal, or the magnetic permeability of the weld metal becomes too high to function as a magnetic cutoff component for the clutch. For example, submerged arc welding is an efficient construction method because it deposits a large amount of metal per unit time, but as mentioned above, a large amount of iron enters the weld metal, causing cracks in the weld metal, and the clutch It cannot be used as a magnetic shielding component because it does not have the required magnetic permeability. As described above, all of the conventional techniques have the disadvantage that magnetic shielding components with stable performance cannot be manufactured. Therefore, the current situation is that it is desired to develop a manufacturing method that has sufficient bonding strength and magnetic permeability necessary for the magnetic shielding component to function as a clutch. The present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to provide a portion of the steel disk with the necessary magnetic permeability and stable sufficient magnetic permeability to perform the clutch function. The object of the present invention is to provide a method for obtaining a non-magnetic part having a high bonding strength. (Means for Solving the Problems) In order to solve the above problems, the present inventors have developed the following methods among conventional methods:
In particular, as a result of intensive research on methods that can eliminate the drawbacks of method (3), we have found that MI
We have discovered that this is possible by applying excess welding to one layer per layer using G welding, and hereby we have created the present invention. That is, in the present invention, when providing a non-magnetic part in a part of a steel disk in an electromagnetic clutch magnetic cutoff component, a U-groove with a width of 9 to 11 mm is machined in the steel disk, and the groove is used as a groove. ．． I Y309 or Y30
MI using consumable stainless steel electrodes compatible with 9L
Welded using G welding with one pass per layer, and
The surface height of the final layer of the weld is 1m with respect to the base metal.
The gist of the present invention is a method for manufacturing an electromagnetic clutch magnetic cutoff component, which is characterized in that the welding process is carried out so that the dimension is lower than m or more and 3 mm or less. The present invention will be explained in more detail below. (Function) As mentioned above, the present invention basically requires a narrow groove width of 9 to 11 mm as a groove formed on a steel disk, and a consumable electrode JIS Z3321 Y30 for stainless steel.
9 or Y309L, the inside of the groove is welded in one pass per layer, and the final layer surface of the weld metal is 1 mm or more and 3 mm or less from the surface of the base metal. If the groove width is less than 9 mm or more than 11 mm, poor fusion will occur, so the groove width should be in the range of 9 to 11 mm. The electrode material used for MIG welding is JIS electrode material for stainless steel, in order to obtain the magnetic permeability necessary for a magnetic cutoff part for an electromagnetic clutch in non-magnetic weld metal.
Among those specified in 23321 (stainless steel rods and wires for welding), y309t or Y309L
use. However, Y with relatively small amounts of Ni and Cr
309, Y308L, and Y316 and 316L, which have a relatively small amount of Cr and contain Mo, do not have the magnetic permeability required as a magnetic cutoff component for an electromagnetic clutch. In addition, the chemical components of Y309 and Y309 L(7) are:
Ni:12. O~14.0%, Cr:23.0-25.
0%, P≦0.03%, S≦0.03%, Mn: 1.0
~2.5%, SiS2.65%, C50,12% (Y3
09L is C50,030%). The lamination method of MIG welding requires welding grooves in one pass per layer. If multiple passes (two or more passes per layer) are used, a large amount of Fe in the base metal (steel disk) will penetrate into the weld metal, causing cracks in the weld metal or making the magnetic permeability of the weld metal too high. So I don't like it. Furthermore, the height of the final layer of weld metal is 1 higher than the surface of the base metal.
It is necessary to lower the height by ~3 mm. 1m from the base material surface
If it is less than 3mm (including the same height and the height where excess buildup appears on the surface of the base material), the magnetic permeability will be too high, and if it is lower than 3mm from the surface of the base material, welding workability will deteriorate. At the same time, the cost of cutting the base material after welding increases. Note that other MIG welding conditions are not particularly limited. (Example) Next, an example of the present invention will be shown. As shown in Figure 4, a disc made of steel (810C) is
) was 7 to 15 mm, and a U-shaped groove with a depth (D) of 15 mm was machined. Next, as shown in Figure 5, JIS Z3321
Using a consumable electrode compatible with Y309 or 309L, the inside of the groove was MIG-welded in one pass per layer under the welding conditions shown in Table 2. At that time, the height of the final layer of weld metal was set 1 mm lower than the surface of the steel material (810G) that was the base material. Thereafter, as shown in FIG. 6, the surface of the base material was machined and finished. The steel disks manufactured in this way, which partially had non-magnetic parts, were examined for internal defects using a radiographic test. The results are shown in Table 1. As is clear from Table 1, the groove width of the groove is 9 to 11n+
Only in the n+ range, defects such as poor fusion were not observed in the welded portion, but defects such as poor fusion were observed when the groove width was 8 mm or less and 12 mm or more. Therefore, it can be seen that the groove width of the groove in the range of 9 to 11 mm is appropriate for a clutch rotor. Also, like this, the groove width is 9~
11 mm, that is, 10 mm±1 mm, is sufficient, so there is a considerable margin for machining accuracy, and it is also possible to significantly reduce machining costs. Table Example 2 A steel disk with a width of 10.5 mm was prepared in the same manner as in Example 1.
A U-shaped bevel groove with a depth of 15 mm was machined, and then various wires shown in Table 3 (Y309
, Y309, Y309L, Y316, and Y316L), MIG welding was performed under the conditions shown in Table 4, followed by finishing processing. The surface height of the final weld metal layer was the same as in Example 1. Table 3 shows the results of measuring the magnetic permeability of the final layer welded metal part. From Table 3, it can be seen that only when Y309 and Y309L are used as wires, the magnetic permeability μ≦1.2 required for a magnetic cutoff component for an electromagnetic clutch can be obtained.

[Left below]

Arrow "1" Width 10.0 mm on a steel disk in the same manner as in Moxibustion Example 1
A U-shaped groove of 15 mm and depth was machined, and then MIG welding was performed using wire Y309 under the conditions shown in Table 6. At that time, welding was carried out while changing the height of the final layer welded part from -5 mm to +5 mm with respect to the base metal surface (see FIGS. 7(a) and (b)). Finishing was done after welding. Table 5 shows the measurement results of the magnetic permeability of the surface of the weld. From Table 5, it can be seen that if the height of the final layer weld is made deeper than -11 with respect to the base metal surface, a weld metal with a magnetic permeability μ≦1.2, which is required as a magnetic cutoff part for an electromagnetic clutch, can be obtained. Recognize. Note that if the height of the final weld is deeper than -1 mm, there will be no major change in magnetic permeability, but if it is deeper than -4 mm, welding becomes difficult and the range of base material removed due to finishing is increased. Since the number of man-hours increases, the maximum is -3 mm.

[Left below]

(Effects of the Invention) As detailed above, according to the present invention, a non-magnetic portion having sufficient joint strength and stable low magnetic permeability is provided in a part of the steel disk of the electromagnetic clutch magnetic cutoff component. Therefore, the reliability and safety of industrial electromagnetic clutch magnetic cutoff parts can be greatly improved.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams explaining the conventional welding procedure, Figure 4
The figure is an explanatory diagram showing the dimensions and shape of the groove, Figure 5 is a diagram explaining the lamination method of the groove, Figure 6 is a diagram explaining the finishing process after welding, and Figures 7 (a) and (b). ) is a diagram illustrating the excess height, where (a) shows the case of plus (+) with respect to the base material surface, and (b) shows the case of minus (-). Patent applicant: Kobe Steel, Ltd., Shinko Electric Co., Ltd., patent attorney: Hisashi Nakamura. \ C'l1l)'"-] A7j)%1) 16 Ichiku 4 ni Li 7v Umata (10) (b) 7#: Theft 11 minus (-)

Claims (2)

[Claims] (1) When providing a non-magnetic part in a part of the steel disk in the electromagnetic clutch magnetic cutoff part, the width of the steel disk is 9 to 1 mm.
Machining a 1mm U groove, using the groove as the groove, JISZ3
MIG welding is performed using a consumable stainless steel electrode compatible with 321Y309 or Y309L, with one pass per layer, and the surface height of the final layer of the weld is 1mm relative to the base metal. A method for manufacturing an electromagnetic clutch magnetic cutoff component, characterized in that welding is carried out so that the dimension is lower than or equal to 3 mm. (2) The method according to claim 1, wherein after the welding process, the base material is finished by cutting to the height of the final layer.