JPH04106925U - lawn mower blade - Google Patents

Abstract

(57) [Summary] [Purpose] Improve the wear resistance of lawn mower blades that cut grass roots, especially the blade tip that sinks into the ground during grass root cutting work. To obtain a lawn mower blade that can maintain sharpness for a long time, give a beautiful appearance to the green after cutting the lawn roots, and finish the lawn with good growth. [Structure] Diamond particles D and/or pulverized powder of cemented carbide are fixed and held on the cutting edge of the cutting tool 3 by eutectoid plating with nickel, or the diamond particles D
And/or a cutting edge tip formed by mixing particles of crushed carbide powder and a metal binder, pressure molding, and sintering is applied to both end surfaces of the cutting tool base constituting the cutting tool 3, either integrally with the cutting tool or with silver. It is characterized by being welded and held using wax bonding or carbon dioxide laser welding.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a cutting tool that is attached to a lawn mower to perform lawn mowing work. Lawns such as bent green and Korai green used for golf course greens, etc. This invention relates to an improvement in a lawn mower blade for cutting grass roots.

0002

[Conventional technology]

For example, bent greens and Korean greens are used for golf course greens. When the roots of grass, such as grass roots, spread out, the roots become close together, causing what is called root rot. cause a phenomenon. Therefore, in order to prevent this phenomenon, periodically remove the grass roots with a lawn mower. It is necessary to carry out cutting work. Lawn mowers that perform this type of lawn cutting work must be electric motors or engines. Which prime mover is equipped and multiple cutting tools are attached to the rotating shaft that rotates with the power of this prime mover? The one attached is common.

0003

[Problem that the idea aims to solve]

However, since grass has roots in the soil near the ground surface, when cutting the grass roots with a lawn mower like the one described above, S i O contained in feldspar and quartz present in the soil is removed. Highly hard minerals such as ₂ , Al ₂ O ₃ , Fe ₃ O ₃ , MgO, and Na ₂ O cause early wear of lawn mower blades.

0004 Incidentally, when cutting grass roots using a steel blade, the blade of the lawn mower is , After finishing work on one green, the blade tip wears out about 2 cm and becomes unusable. In addition, as the wear of the cutting tool progresses, the sharpness of the cutting tool becomes worse, and eventually, The grass roots are cut off by the blade rotating at high speed, and the grass roots of one green are cut off. Not only does the appearance of the green after cutting look bad, but it also has a negative impact on the growth of the lawn. The greens are not finished beautifully.

[0005] This idea was created in view of the problems mentioned above, and its purpose is to , Lawn mower blades that cut grass roots, especially blade edges that sink into the ground when cutting grass roots. By improving the wear resistance of the part, the blade maintains good sharpness for a long time, and A beautiful green that has a beautiful green appearance after cutting the roots of Lean and helps the grass grow well. The objective is to obtain a blade for a lawn mower that can be finished to perfection.

[0006]

[Means to solve the problem]

In order to solve the above problem, the lawn mower blade of this invention is Diamond, the hardest natural mineral, is used at the cutting edge of the cutting tool that cuts the roots of the lawn. Hardness equivalent to or greater than hard minerals contained in sand particles or underground. For example, using pulverized cemented carbide powder whose main component is tungsten carbide, The diamond particles and/or the crushed powder of cemented carbide are fixed to the cutting edge of the cutting tool. or depositing said diamond particles and/or said cemented carbide. A cutting edge tip formed by pressure forming and sintering a mixture of pulverized powder and metal powder binder. The abrasion resistance of the cutting edge portion of the cutting tool is improved by holding it on the cutting tool base. It is characterized by this.

[0007] Specifically, this idea uses the following method to attach the blade to the cutting edge of the lawnmower blade. Diamond particles and/or crushed powder of cemented carbide were retained. The blade of the lawn mower is coated with nickel plating, and diamond particles and/or Alternatively, eutectoid plating of pulverized cemented carbide powder and nickel can be applied to diamond particles and The pulverized powder of cemented carbide and/or cemented carbide was fixedly attached to the cutting edge of the cutting tool. Holding parts are formed on both end surfaces of the blade base that constitutes the blade of the lawn mower, and this holding part is The part is made of diamond particles and/or crushed powder of cemented carbide and a binder of metal particles. The mixed materials were pressure molded together and sintered to hold them together. A binder of diamond particles and/or crushed powder of cemented carbide and metal particles. The mixed material is pressure-formed and sintered to form a cutting edge tip. was held on both end surfaces of the blade base by silver soldering or carbon dioxide laser welding. . In addition, in the above or other methods, diamond particles and cemented carbide The particle size of the pulverized powder was appropriately selected from the range of #40/50 to #600.

[0008]

[Effect]

Using the above method, diamond grains within the particle size range of #40/50 to #600 are The lawn mower blade of this invention, which holds pulverized powder of powder or cemented carbide on the cutting edge, The diamond particles or the crushed powder of cemented carbide are held extremely firmly by the cutting tool. Therefore, it has excellent abrasion resistance and can maintain good sharpness for a long time.

[0009] Therefore, cutting the grass roots used for golf course greens, etc. The green looks beautiful after the work is completed, and the grass is growing well, making it a beautiful green. can be finished.

0010

【Example】

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings. In addition, Figure 1 or In Figure 6, diamond particles and crushed cemented carbide powder are shown for ease of explanation. The figure has been enlarged from the actual figure.

[0011] [First example] FIG. 1 is an explanatory diagram of the first embodiment of this invention. g/l, nickel chloride 45g/l, boric acid 40g/l, commercial brightener 22ml/l A bath liquid 2 having a bath composition of 1 is filled. The bottom of the bathtub 1 is masked 4 to expose only the necessary parts, and the positive electrode A cutting tool 3 connected to the side electrode 5 via a conductive wire 6 is mounted. Diamond particles D were evenly shaken off onto this cutting tool 3 from above the bath liquid surface. After that, a nickel plate 8 connected to the negative electrode 7 via a conductive wire 9 is placed in the bath solution. Diamond particles are immersed in the diamond grains by applying a voltage to the positive and negative electrodes 5 and 7 for a certain period of time. The particles D were electrodeposited on the surface of the cutting tool 3.

0012 After electrodepositing the diamond particles D on the surface of the cutting tool 3, the cutting tool 3 is turned over, Diamond particles D were electrodeposited on the back side in the same manner. The diamond particles D electrodeposited in this way are attached to the cutting tool 3 as shown in FIG. It is firmly held through the nickel plating layer 13a and does not easily fall off. Attach the blade 3 manufactured in this way to a lawn mower and use it on the green of a golf course. When cutting the grass roots of the lawn being used, the grass roots of one green were cut. No wear of the cutting tools was observed. In this example, diamond particles were used, but a similar method could be used. By the method, crushed cemented carbide powder or a mixture of crushed cemented carbide powder and diamond particles is produced. It is also possible to uniformly shake off the compound onto the surface of the cutting tool 3 and electrodeposit it.

[0013] [Second example] Figure 3 is an enlarged view of the main parts of the cutting tool used in this example, and (a) is its side view; (b) is its top view, and Figure 4 is a part of the mold for forming the cutting edge at the tip of this cutting tool. It is a figure which shows an example. In FIG. 3, the cutting tool base 11 constituting the cutting tool 10 has a cutting edge portion held on both end surfaces. A protrusion 12 is provided. When forming the cutting edge part 13 on the cutting tool base 11, as shown in FIG. 1 is held between the upper presser 16 and lower presser 17 of the mold 22, and the bolt 15 is supported by the cutter 10. After inserting into the holding hole 11a, the nut 14 is tightened and fixed.

[0014] Inclined surfaces 21, 21 are formed on both end surfaces of the upper presser 16 and the lower presser 17. The inclined surfaces 21, 21 have a tapered inner surface inclined in the same direction as the inclined surfaces 21, 21. The outer ring 20 with the portion 23 formed thereon is fitted onto the outer ring 20 and is then punched with the upper punch 18 and the lower punch 19. This prevents the upper presser 16 and lower presser 17 from shifting during pressurization. In this example, the metal powder binder (hereinafter simply referred to as metal binder) is Co. Uses a compound containing 70% by weight, 25% by weight of Cu, and 5% by weight of Sn. did.

[0015] The metal bonding material is filled with a mixture of diamond particles having a grain size of #170/200 uniformly mixed with a concentration of 100% into the mold, and an upper punch 18 and an upper punch driven by hydraulic pressure are integrally formed with the protrusions. The lower punch 19 was used to apply pressure from the direction of the thick arrow in the figure at a pressure of 5 ton/cm ² to form the blade, and the blade was sintered at a temperature of 860 degrees in an electric furnace (not shown) to form the cutting edge part 13. .

[0016] In this embodiment, as shown in FIGS. 5(a) and 5(b), the base 1 of the cutting tool is A plurality of holes 12a are bored in the protrusion 12 provided on both end surfaces of the protrusion 12. If the mixed material is sintered and bonded, the mixed material is used when forming the cutting edge portion 13. The composite material is also filled into the hole 12a, pressure-formed, and sintered, making it even stronger. Can be joined. Also, in this example, as in the first example, diamond particles are used instead of diamond particles. Alternatively, a mixture of diamond particles and ground cemented carbide powder can be used. It is Noh.

[Third Example] In the third example, a cutting edge tip made by mixing and sintering a metal binder and diamond particles was held on the base of a cutting tool by silver wax bonding. In this third example, 100% by weight of Co was used as the metal powder binder, and a mixture of diamond particles having a grain size of #120/140 uniformly mixed therewith with a concentration of 150% was filled into the mold. . Thereafter, it was pressurized with a hydraulic press at a pressure of 5 tons/cm ² and sintered at a temperature of 860 degrees in an electric furnace to form a cutting edge chip, which was bonded to both end surfaces of the base of the cutting tool with silver wax. .

[0018] Figure 6 shows the state in which the cutting edge tip is bonded to the cutting tool base with silver solder, and (a) A side view, and (b) a top view thereof. In this figure, the cutting edge tip 26 is attached to the end surface of the cutting tool base 25 at the joint 27. The cutting tool 24 is formed by joining with wax. In addition, 28 in the figure increases the bonding area, This is a protrusion for more firmly holding the cutting edge tip 26 on the end surface of the cutting tool base 25. The blade 24 manufactured in this way is attached to a lawn mower, and When cutting the grass roots of the lawn used in the No wear of the cutting tool 24 was observed during the work.

[Fourth Example] In the fourth example, in place of the diamond particles used in the third example, crushed cemented carbide powder with a diamond equivalent concentration of 100% and a particle size of #200/230 was used. , mixed uniformly with metal binding material and filled into a mold. Thereafter, it was pressurized at 3 tons/cm ² using a hydraulic press and sintered at a temperature of 860 degrees in an electric furnace to form a cutting edge tip. Then, this cutting edge tip was bonded with silver wax to both end surfaces of the base of the cutting tool. When the blade 3 manufactured in this way was attached to a lawn mower and the grass roots used for the greens of a golf course were cut, it was found that the blade did not wear out when cutting the grass roots of one green. It was about 0.5 mm.

[0020] In addition, in the third and fourth embodiments described above, the cutting edge tip is bonded to the cutting tool base with silver wax. However, welding using the carbon dioxide laser welding method, which has been attracting attention recently. If so, it can be held more firmly to the base of the cutting tool. In addition, in the third and fourth embodiments described above, the crushed cemented carbide powder and die It is also possible to produce a cutting edge tip by mixing Yamond particles.

[0021] In addition, in the first to fourth embodiments described above, the diamond particles used And the particle size of the crushed cemented carbide powder is within the range of #40/50 to #600. It is desirable to select and use them appropriately. Generally, the coarser the diamond particles, the higher the price. In addition, when the Ditamond particles and the crushed powder of cemented carbide become finer, the retention force of the particles decreases. and the cutting ability of the cutting tool decreases. Therefore, the applicant has determined that the particle size of diamond particles and cemented carbide powder is It has strong holding power for diamond particles and crushed powder of cemented carbide, and has good cutting ability. , #40/50 to #6, which is reasonably priced when using diamond particles. It was limited to within the range of 00.

[0022]

[Effect of the idea]

According to this invention, diamond particles or crushed powder of cemented carbide are is strongly held by a cobalt-based metal binder, so diamond particles and Extremely little falling off of crushed cemented carbide powder, excellent wear resistance, and long lasting performance. It allows you to maintain good cutting performance and create a beautiful green lawn with good growth. I can do that. In addition, cutting edges made of diamond particles or crushed cemented carbide powder are used as cutting tools. Method of pressure forming and sintering integrally with the base, and diamond particles or cemented carbide The cutting edge tip formed using pulverized powder is bonded with silver wax or carbon dioxide gas to the cutting tool base. Similar effects can also be obtained by laser welding.

[0023] In addition, the particle size of the diamond particles and cemented carbide powder used is #40/5. Since it was selected appropriately from the range of #0 to #600, it has excellent wear resistance. A cutting tool with good cutting performance can be obtained, and when using diamond particles, However, it is possible to manufacture a suitable cutting tool in terms of price.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a state in which diamond is held on the cutting edge of a cutting tool by electroplating using nickel, according to a first embodiment of the invention.

FIG. 2 is a front view of the cutting tool obtained by the method of FIG. 1.

FIG. 3 is a diagram showing a cutting tool base used in a second embodiment of the invention, in which (a) is a side view thereof, and (b) is a top view thereof.

FIG. 4 is a diagram showing a method of forming a cutting edge portion on the cutting tool base of FIG. 3;

FIG. 5 is a diagram showing another example of the cutting tool base of FIG. 3,
(a) is its side view, and (b) is its top view.

FIG. 6 is a diagram showing a state in which the cutting edge tip is bonded to the cutting tool base with silver solder; (a) is a side view thereof, and (b) is a top view thereof.

[Explanation of symbols]

1 Bathtub 2 Bath liquid 3, 10, 24 Cutting tool 4
Masking 5 Positive electrode 7 Negative electrode 8 Nickel plate 11, 25 Cutting tool base 12 Protrusion 13 Cutting edge portion 16 Upper presser 17 Lower presser 18 Upper punch 19 Lower punch 20 Outer ring 21 Inclined surface 22 Mold 26 Cutting edge tip 27 Silver wax bonding Department

Claims (5)

[Scope of utility model registration request] Claim 1: Apply base nickel plating to the surface of the blade of a lawn mower, eutectoid plating of diamond particles and/or crushed cemented carbide powder with nickel, and apply diamond particles and/or crushed powder of cemented carbide to the surface of the blade. A lawn mower blade characterized by being fixedly attached to the surface of the blade edge of the blade. [Claim 2] A cutting edge tip formed by uniformly mixing diamond particles and/or crushed powder of cemented carbide and a binding material of metal powder, and press-forming and sintering this mixed material, is used in a lawn mower. A blade for a lawn mower, characterized in that the blade is held on both end surfaces of a blade base constituting the blade. 3. Holding parts are formed on both end surfaces of the cutting tool base, and the cutting edge tip is pressure-molded into the holding parts and sintered to be held on the cutting tool base. The lawn mower blade according to claim 2. 4. The lawn mower blade according to claim 2, wherein the cutting edge tip is held on both end surfaces of the blade base by silver soldering or carbon dioxide laser welding. 5. The lawn mower blade according to claim 1, wherein the diamond particles and the crushed cemented carbide powder have a particle size of #40/50 to #600.