JPS62203A - Plowing blade - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a tiller blade using a composite material made of iron and/or iron alloy and ceramics.

(Prior Art) Regarding conventional tilling blades, for example, tractor tilling blades,
Iron alloys have been used, and among them, spring steel with excellent impact resistance (eg, J Engineering S Standard SUP Otsu) has been used.

(Problems to be Solved by the Invention) However, the tilling blade for a tractor made of an iron alloy has poor wear resistance, and when the tilling blade is severely worn out, it is necessary to replace the tilling blade after approximately one hour of use. In addition, in order to improve wear resistance, attempts have been made to make the cutting edge or the entire blade of the tiller blade made of ceramic, but ceramics lacks toughness compared to metals and may come into contact with hard objects such as stones in the soil during use. In some cases, a part or the entire blade was easily chipped or broken, and there was a strong desire to develop a material that had the advantages of both the impact resistance of metal and the abrasion resistance of ceramics.

(Means for Solving the Problems) In order to meet the above-mentioned demands, the inventor Peng has conducted various research studies and has developed a composite material consisting of iron and/or iron alloys and ceramics for use in tractor tillage. By using the cutting edge of the blade or the entire blade, there is no breakage or breakage of the blade when using a wide tractor, and there is no wear phenomenon at all, making it possible to use it smoothly. I ended up getting it.

That is, the tilling blade of the present invention is characterized in that a composite material made of iron and/or a G-iron alloy and ceramics is used for the blade edge or the entire blade.

This is because the above composite material has excellent impact resistance due to the high toughness of iron and/or iron alloy, and excellent wear resistance due to the high strength and hardness of ceramics. This is probably why it has the features of both. Note that if the volume content of ceramics is less than 1%, no improvement in wear resistance is observed and the composite material is not effective. On the other hand, if it exceeds 50%, it becomes quite brittle, has poor impact resistance, and is easily cracked. The above is the reason for limiting the ceramic volume content to 1% or more and SO% or less.

(Effect of the invention) Next, examples will be given to describe the effects of this invention.

Example/ Reduced iron powder with an average particle size≠0 μm and alumina with an average particle size of 20 μm were uniformly mixed using a vibrating ball mill in the formulation shown in Table 1, and then vacuum degree/QTDrr.

Sintering temperature 1200'c, pressure 200Iai/aa
Vacuum hot pressing was performed under the following conditions to obtain a disk-shaped test piece with a diameter of 2 oomm and a thickness of fmm. Table 1 shows the micro Vickers hardness of each test specimen. In addition, as shown in Figure 1 of the drawing, the cutting edge 2 of the tilling blade L for a tractor was cut out from the obtained test specimen, processed, and then joined by brazing, and the tilling blade was attached to the tractor and used for 10 hours. observed. The results are shown in Table 1.

Table 1 Example 2 Iron alloy (svpJ) powder with an average particle size of 3≠μm and alumina with an average particle size of 3μm were mixed uniformly using a bot mill in the composition shown in Table 2, and then placed in a rubber mold and molded. Pressure 3
A molded body was obtained by performing a rubber press at a pressure of 1 on/c+a''.The molded body was subjected to green processing under a vacuum degree of IQ Torr.

The entire tiller blade l shown in FIG. 1 was manufactured from a composite material in a vacuum sintering furnace under the conditions of sintering temperature/2 OOc.

Table 2 shows the micro-Vickers hardness of each test specimen and the appearance after being installed on a tractor for 10 hours.
Table 2 Example 3 Stainless steel alloy with an average particle size of 2 s μm (strsj04'
) Powder and silicon carbide powder having an average particle size of S μm were uniformly mixed using a bot mill in the formulation shown in Table 3, and then placed in a mold for molding at a molding pressure of /'10n/el12.
A molded body of ox, 30×10WltH was obtained. The molded body is raw-processed at a vacuum level of 10 Torr and a sintering temperature of /2!
0'Q (7) Micro-Vickers hardness of each test specimen manufactured using composite material as shown in Figure 1 in a vacuum sintering furnace under conditions TE and after 70 hours of practical use after being installed on a tractor. /, J, 3, "good" means 7
The amount of wear after 0 hours of use is within 5% of the weight of the front cutter.

Conventionally used iron and iron alloys (mainly so-called springs) have poor wear resistance, and when this wear resistance is extremely severe, it is necessary to replace the tiller blade, which poses a problem in work. Recently, attempts have been made to replace the cutting edge or the entire tiller blade with ceramics, which have excellent wear resistance, but due to the lack of toughness of ceramics, the blades break during use.

According to the present invention, when a composite material made of iron and/or iron alloy and ceramics is used for the cutting edge or the whole of the tiller blade, Experiments &3 to A7 in Table 1 and Experiments A/' in Table 2
A-&/9- As shown in Experiments A2hiro to A2g in Table 3, there was no wear or chipping, and continued good use was possible. This is due to the excellent impact resistance of iron and iron alloys,
This is believed to be because the present invention brings out both of the excellent wear resistance characteristics of ceramics.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the entire cultivating blade for tigers and lids, and FIG. 2 is a front view showing the wear state of the cutting edge after practical use. , FIG. 3 is a front view showing a state where the cutting edge is partially chipped. 10. Knives, 20. cutting edge

Claims (1)

[Claims] 1) A tillage blade characterized in that a composite material made of iron and/or iron alloy and ceramics is used for the blade edge or the entire blade. 2) The tiller blade according to claim 1, wherein the volume content of the ceramic is 1% or more and 50% or less.