JPS58159937A - Manufacture of endless belt hoop - Google Patents

Abstract

PURPOSE:To improve material yield and reduce production cost by welding both ends of a maraging steel band to form an endless ring, annealing at above specified temperature, ring rolling and performing solid solution and aging treatments. CONSTITUTION:A welded ring for ring rolling is manufactured by welding both ends of a maraging steel material. After annealing at >=800 deg.C, it is ring rolled to form a belt hoop. An endless hoop of very small variation in building up having a smooth weld zone is manufactured by solid solution treating for about an hour at about 820 deg.C and aging for about 3hr at about 510 deg.C.

Description

Detailed Description of the Invention The present invention relates to a method for manufacturing an endless belt hoop (O, multilayer belt made of mineral or metal) 04) Improving the plate thickness of the belt hoop (N degree O). By welding them into an endless shape and then annealing them, we can eliminate the distortion during connection and the increase in hardness due to bath welding, and the fluctuation force in wall thickness that occurs during ring roll processing of the edge. In recent years, the adoption of endless belts made of gold Js as a power transmission means for automobile engine generators, etc. has been considered, but in consideration of the belt's flexibility, strength, and lubricity, thin-walled belts are used. It is desirable to use a metal multilayer endless belt obtained by combining hoops in multiple layers.

The maximum 1g1I111 point when putting such a thin-walled multilayer metal endless belt into practical use is the 1st layer, the 2nd layer, the n layer I
and the accuracy of the thickness difference and plate thickness between the belt hoops of the m+1st layer 9th grade S*. If the circumferential length difference is too large or too small, a difference will occur in the stress applied to the belt in each layer, and the zero strength of the belt will decrease. In extreme cases, even assembling them as a multiple belt becomes difficult. In calculation, the ms difference between each layer is required to be 2tt (the size of the social belt), and the accuracy is as follows: Δl=±0.1−/ for Jllll length/=1000−/−K.

That is, accuracy of ±o, ois is required. Also, regarding the plate thickness, strict plate thickness accuracy is required because the stress applied to each belt hoop is constant.

Furthermore, in order to keep the wear caused by the friction between the hoops constant, there must be no variation in the distance between the hoops, and therefore local surface irregularities and distortions become a problem.

As a conventional method developed to meet such requirements, there is a method for producing a multilayer belt as shown in FIG.

In this method, as shown in Figure #11, the material (1) for the metal endless belt is first processed into a preform by machining.
It is processed into a cylindrical shape as shown in Figure (3)K. Next, this material (11ti, mandrel (2) Kllml
11. Mandrel (2) A punch (31KL thin-walled cylinder (15
is formed into. The obtained thin-walled cylinder (15 is shown in Fig. 2 (C) is shown in Fig. 2 (C).
) As shown in ), the thin cylinder (1') is attached to the work roller (4), tension roller (4), and O-gate, and is sandwiched between the backup roller (5), (5b) and y (5c) to surround it. The thickness of the belt and the finishing of IIIt in [8] are performed by plate-making (ring milling), and the belt is further cut into the width required for the belt. Due to this ring mill processing, multiple bells) 011! The ninth circumferential length Ln corresponding to the m-th piece is sequentially molded. (1-1), (1-2),...
・After combining (1-ml) into a multiple S-width) shape, the core material (7) of heat-resistant steel (7), which also has a large coefficient of thermal expansion, is used as shown in Fig. 2 (ψ). The entire ring is inserted and heated, and the multiple rings are plastically deformed between each layer and corrected to follow the dimensions of the core metal material. !You will get an endless belt made of gold j1 with nine layers.

As mentioned above, this method consists of the steps of producing each endless belt hoop, assembling the resulting nine belt hoops into multiple layers, and correcting the dimensions at high temperature using a core metal. There is no doubt that the above method of opening the core bar and straightening multiple layers at once is more effective than the method described above. In addition, in order to perform such core metal straightening, it is necessary to utilize the difference in dynamic deformation characteristics against heat between the core metal and the belt.
,. □8□, ヮ□1. Maraging, which has a special effect on precipitation, is optimal.

However, after manufacturing the shilling-shaped bulk material by the above-mentioned tube spinning process, a single endless belt hoop of llll & l is finished using a combination of heat treatment and ring roll processing. The dimensional accuracy of the product is affected, and it is difficult to simultaneously control the uneven thickness, plate thickness, and circumference of the product.
The disadvantages are that the time required is long, the yield of material in belt hoop production is low, and production costs are high. , as well as other conventional processes for manufacturing such a single endless belt hoop! After cutting ultra-thin Ruesinda steel material to a specified thickness and length using IK to make a strip material, both ends of the material are cut into #! There is also a method to make belt hoops by rolling them into belt hoops (as in the above process), but the production costs are significantly reduced, but thermal distortion occurs in the process, and the hardness near the welds increases, making it difficult to process subsequent ring rolls. In the process, unevenness or distortion occurs due to uneven thickness.
When these belts 7 are used in a multi-layered manner, it is impossible to avoid mass sales in which the abrasion caused by single vibration causes KM to occur intensively in the distorted portion.

Therefore, the object of the present invention is to
This method is suitable for manufacturing individual belts 7' that constitute a multilayer endless belt made of maraging copper, in which the belts 7' are placed on each other and used with a multilayer belt, and the manufacturing cost is low and the plate thickness is low. It is our aim to provide a method for manufacturing an endless belt hoop that can achieve the ^NIILK structure, and the base for making it tatami is to connect adjacent metal endless belt hoops to one another! In the method for manufacturing a rounded endless belt 7-p to be used as a multilayer belt by welding the inner end of a maraging steel strip material into a ring shape, the inner end tube is welded into a ring shape, and then annealed at a temperature of 800°C or higher, The present invention provides a method for manufacturing an endless belt 7, which is then subjected to ring roll processing, followed by solution treatment and aging treatment.

Next, examples of the present invention will be explained in detail with reference to Appendix #W below.

Here I! +3- is an engineering diagram showing a manufacturing process for a belt hoop O according to an embodiment of the present invention.

As shown in the figure, in this example, 18S No-based maraging steel thin plate material (cold press, heat treated material thickness: 1' = 0.8 mm, for example) is used with a predetermined width and an example of tef width. W-20s/, [116G”/,,
) OIF-shaped material m.

Cut into. The thus obtained round strip material is rolled into a ring shape and both ends are welded with an electron beam to produce a welded ring for ring roll processing. The hardness of the material in the vicinity of the weld after Sm is shown in the lower row of Figure 4.

The vertical axis shows the Vickers hardness (HV), and the horizontal axis shows the distance from the center of the weld (%/).The measurement point at the weld is shown by a black circle, and the measurement point multiplied by the base material K is shown by a white circle. It can be seen that the hardness reaches its peak at a location that is IFL/ali degrees on both sides from the center of the weld.

If such an extreme change in hardness is left unattended and the subsequent ring rule processing is performed, the result will be uneven *4DR1, and when combined into a multilayer belt, the stress on each belt hoop will no longer be uniform, causing the belt hoop to become uneven. This will lead to breakage and wear and tear. Therefore, in the present invention, the weld ring is annealed to achieve #!
After making the hardness distribution of the rolled part uniform, link roll processing is performed. In this example, annealing was performed at 850° C. for 1 hour.

The hardness distribution in the vicinity of the welded part after annealing at this time is shown in the upper part of FIG.

This figure is fI by Shiyaki Jun! It can be seen that the tK heat peak at about 1 shi 1 in the center of the collapsed part disappears, and the hardness becomes uniform. In this example, the ring-shaped body thus obtained was subjected to ring roll processing to form a belt hoop with a shore height of 0.2 mm/3 and a circumferential length of 800 WL/-.
As a result of performing solution treatment for 1 hour at 9510°C and aging treatment for 3 hours, we succeeded in producing an endless belt hoop with very little variation in wall thickness and a smooth 1 m joint.

The above solution treatment is generally applied to maraging steel at a temperature of 800~
The aging treatment is carried out at 900℃ and 450 to 550℃.As for the bath shaking method, electron beam S* and plasma arc welding, which have relatively less variation in the thickness of the deposited metal compared to the base metal, are preferable, but TIG Welding is also possible.

FIG. 6 shows a section l- in the vicinity of the welded portion after ring roll processing. (9) is the outward direction of the belt, (9) is the circular surface, and IuJ
IW (1) is #1 edge state, (6) is 750
℃X1 hour "1m" O annealing is performed, (0 is 850
After annealing for 1 hour at °C, ring roll processing is performed.In the case of welding and welding (1), large irregularities (uneven thickness) are observed on the sides, but the annealing temperature increases. It is understood that the amount of declination decreases as
? -The annealing temperature is preferably 800°C or higher. Figure 5 shows the experimental results of the amount of deviation after link roll processing at various annealing temperatures. This increases the annealing temperature to 8
As the line temperature increases up to 00℃, the amount of deflection decreases to 80℃.
It can be seen that when the temperature exceeds 0°C, an equilibrium state is reached.

As described above, in an endless belt manufacturing method for making adjacent metal endless belt hoops in close contact with each other and using it as a multilayer belt, both ends of a maraging steel strip are welded to create an endless belt. After forming the ring shape, it is annealed at 800°C or more at OII degree, and then the ring-shaped
Processing and further solution treatment #! Since this is a manufacturing method for an endless belt hoop that involves aging treatment and aging treatment, the hardness distribution occurring in the 11 part is uniform and **<
Fig. 4), uneven thickness, unevenness, and distortion of the welded part due to subsequent ring roll processing are eliminated (Fig. 611), when ring roll processing is performed through a heat-sensitive layer after spinning as in the past (deflection +10 to 15 μm). ), it is ideal for multi-layered belts as it can suppress the amount of deviation to less than 6 m, and it also improves material handling compared to the conventional method mentioned above, and reduces production costs by shortening the process. has decreased.

[Brief explanation of the drawing]

Figure 1 Hiro, the gap between adjacent belt hoops is substantially K
Step 11 of the forming process of metal endless belt which is O! -1 No. 28i1 (&) Fi's fault in the raw materials supplied to the same process, (b) the mistake in the tube vinyl/g processing used in the company's method! Material O1111111ml showing the figure, (c) is a schematic diagram showing the state of ring-n-ru processing of each single belt *'mh
. (d) is a fresh view showing the state in which the core metal material is fitted into the belts stacked in multiple layers, and Kame 3 shows the manufacturing process of the belt hoop according to an embodiment of the present invention. -, Figure 4 is a graph showing the hardness of the material in the vicinity of the weld after Fim*, showing the state after annealing at 850°C in the upper stage and without annealing in the lower stage. Mamarugame 5- shows the experimental results of the amount of deflection after ring roll processing for various annealing temperatures. Fig. 6 is a cross-sectional view of the vicinity of the m-contact part after ring roll processing. Code explanation 6・*MI! 111m1 hell on f11), 1-1.1-
2. −. 1-n...Single belt hoop in each layer, 7...
・Core metal material. Applicant Kobe Steel Co., Ltd. Agent Patent Attorney Takeo Honjo

Claims (1)

[Claims] In the method of making a 7-ply endless belt, in which adjacent metal endless tape hoops are attached to each other and used as a multilayer belt, both ends of the maraging copper strip #0 are
A 10 ml endless belt manufacturing method, which is characterized by il to form an endless ring shape, then annealing at a temperature of 800°C or higher, then ring roll processing, and further forming a moat and aging 4611 ◎