JPS58164726A - Method for hardening crawler belt pin - Google Patents

Abstract

PURPOSE:To eliminate the need for normalizing of blank materials and to harden the materials with less bulging near the end faces, by hardening the crawler belt pins heated to prescribed temp. under spraying of high pressure water while rotating the same, and spraying air to both end faces. CONSTITUTION:A crawler belt pin A of medium carbon steel constituting an endless track vehicle of such as bulldozer is heated over the entire part to a hardening temp. and is then placed on a roll 2 of a rolling press device A. While the pin is rotated under pressure with a pressurizing roll 2', the pin is hardened with the air sprayed from an air spray 3 on both end faces 1a under spraying of high pressure water over the entire part with a high-pressure water spray having large cooling capacity. The air spray 3 is constituted in the way wherein a rotating body 5 having a recess 7 is supported in the small diameter part 4a of a body 4 through a thrust bearing 6, the outside circumferential wall 7a at the tip formed with the notch 9 of the recess 7 is brought into press contact with the face 1a, and air is supplied through a hole 8 opened in the recess 7 from an air source 10 communicating with the same.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tracked vehicle such as a pull-dose, power pump, bell, etc.
This article relates to a method of inserting the crawler belt bit OWa that constitutes ya*.

The conventional O crawler track is made of medium carbon steel, and the material is tempered and then the high-rise #LfIa is inserted into the J6
．． The current is slightly overheated.

Because of ζO, the heat sensation 1 work is heavier on the image side.

The present invention is based on the above-mentioned circumstances K11 *40'e ban*, and the first thing is to heat #& ring to the specified OAM without checking the quality of the material *! This is done by removing the hooks from the large shoe buds.

After heating the sand and medium carbon copper gypsum bottle to a quenching temperature of 11 #! While rotating 1 bottle 10 times on the cW ring press machine! This is an external quenching method that involves spraying high-pressure water with a high-cooling water spray and simultaneously blowing air onto both ends of the crawler track ν.

By doing this, it is possible to eliminate the need for material tempering, improve wear resistance and fatigue resistance, and reduce the amount of bulge due to volumetric expansion of the corners near both end faces due to marten tubularization. No post-processing is required, and the force F can be reduced.

In order to carry out the following example of the odor body, 5ssc, 5soc, and 5ssc carbon steel were used as raw materials and processed into a shape similar to a crawler track y and a roughly oka shape to prepare a test piece I shown in 1m.

1IiK1aK air spray 1 is press-fitted by placing the KIii rotatably on the other side. 2I press ji: *-A.

The air spray 3 has a rotating body 5t- in the main body 40, small 1 part 4a.
The thrust is rotatably supported via a bearing 6, and a concave portion 7 is formed in the rotating body 5, and a main body 4 is formed in one concave portion.
It has a structure in which a large hole S is opened at the 0 axis, and a notch 9 is formed on the outer peripheral wall of the tip of the recess s7, and the hole 8 communicates with the air source 10.

Then, while rotating the test piece, press roller 2'
While pressurizing the metal body with a high-pressure water spray with a large cooling capacity, air is blown onto both end faces I@ to form a hardening sensitive layer.

At this time, the various conditions are as follows.

High pressure water spray pressure ee411*@IT-・・・・・・
・-2-10 Lid opening revolutions “””…”=
60=25Orpm pressure...*@
＠*＠man6m-〒αlow 25tanm surface air blowing pressure ・・・・・・・・・・・・・・・-α5~5!
v Figure 3 shows the roller pressure and end face air for the amount of bulge on the end face (corner) when a crawler bin made of 5SSC carbon steel is high pressure water spray quenched at a high pressure water spray pressure of 40% and a rotation speed of 90 rμ. This is a diagram showing the results of investigating the influence of blowing.Here, the end face bulge is
As shown in 1, this is for KA-.

Figure 5 shows the O hardness distribution in the vicinity of the layer.

As a result, the amount of bulge can be suppressed by increasing the roller pressure, but the extent of this is relatively small, and the amount of bulge can be significantly suppressed by blowing air on the end surface, and the hardness near the end surface can also be reduced. It turned out that there was sufficient security.

In addition, the fli6 figure shows the relationship between the amount of bulge at the end surface and the air blowing pressure at the end surface.From the results of Ilb Ren, the amount of bulge at the end surface changes depending on the IBM8M near pressure, and
It was found that the bulging view was remarkable from 5 surprises and above.

This is the main @! With IAK, it is possible to prevent material heat-up and improve wear resistance and fatigue resistance, and it also eliminates post-processing by removing a small amount of flakes near the end face!
2. I'm self-destructive.

[Brief explanation of the drawing]

Figure 1II is a front view of the crawler bin, Figure 2 is an explanatory diagram of air spray, Figure 3 is a fungus showing the relationship between roller pressure, air blowing on the layer surface, and bulge near the end surface, Figure @4 is the bulge OH
Figures m and ms are diagrams explaining the hardness in the vicinity of the end face, and 6th s is a table showing the relationship between the end face air blowing pressure and the bulge. Dereijin Co., Ltd. Komatsu Susaku Tsuyoshi Tsuyoshi Patent attorney Masaaki Yonehara Patent attorney Hamamoto Patient 3rd figure 0 (, Ot. Roller pressure force (#heavy) (綽n) 4th WJ 6th figure end surface "7-proboscis SII (“Q/cnP) Procedural amendment (spontaneous) December 24, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 57-046346 2. Name of the invention: Quenching method for crawler bins 3. Relationship with the person making the amendment Patent applicant address 2-3-6 Akasaka, Minato-ku, Tokyo Name (12B
) Ryo Kawai, representative of Komatsu Ltd. - & subject of correction

Claims (1)

[Claims] A crawler pin O sieving method involves spraying high-pressure water into the crawler bottle to insert the hook, and at the same time blowing air into the crawler bottle layer to prevent mold.