Working tine and method for producing the same

Abstract

To provide a tiller tine in which durability can be improved.SOLUTION: A tiller tine 35, which is a working tine, includes a tine main body portion 41 and a hard portion 42 that is harder than the tine main body portion 41. The tine main body portion 41 has, in a portion of the tine main body portion 41 that is not provided with a cutting edge, a plurality of stepped portions, namely a first stepped portion 51 and a second stepped portion 52. The hard portion 42 is provided across the first stepped portion 51 and the second stepped portion 52.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work claw that can be improved in durability and a method for manufacturing the same. [Background technology]

[0002] BACKGROUND ART Conventionally, for example, a work tine (cultivator tine) described in Patent Document 1 below is known.

[0003] This conventional work claw includes a claw main body and a hard portion (hard alloy portion) that is harder than the claw main body.

[0004] The hard portion is provided on the back surface of the claw body (the surface opposite to the direction in which the horizontal blade portion curves relative to the vertical blade portion). In other words, the hard portion is provided by welding a hard alloy to the surface (back surface) of the claw body opposite the inclined bladed surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-77110 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned conventional work claws, the hard portion is provided on the surface of the claw body opposite the sharpening surface, so the sharpening surface side of the claw body is prone to wear out before the hard portion, and there is a risk that sufficient durability will not be achieved.

[0007] The present invention has been made in consideration of the above points, and an object of the present invention is to provide a working claw that can improve durability and a method for manufacturing the same. [Means for solving the problem]

[0008] The work claw of the present invention is a work claw used in agricultural machinery, and comprises a claw main body and a hard portion that is harder than the claw main body, the claw main body having a plurality of step portions in the portion of the claw main body that is not sharpened, and the hard portion is provided across the plurality of step portions.

[0009] In addition, the method for manufacturing a work claw according to the present invention is a method for manufacturing a work claw used in agricultural machinery, and includes a step portion forming process for forming multiple step portions in the unsharpened part of the claw main body, and a welding process for welding hard portions to the multiple step portions using a welding powder material that is harder than the claw main body. [Effects of the Invention]

[0010] According to the present invention, durability can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view of an agricultural implement equipped with tillage tines (work tines) according to a first embodiment of the present invention. [Figure 2] (a) is a plan view of the same tiller tine, and (b) is a side view of the same tiller tine. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. 4 is a partially enlarged view of FIG. [Figure 5] 3 is a cross-sectional view of FIG. 2 taken along line B-B. [Figure 6] FIG. 10 is a side view of a tillage tine according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a cross-sectional view of a tillage tine according to a third embodiment of the present invention. [Figure 8] FIG. 10 is a cross-sectional view of a tillage tine according to a fourth embodiment of the present invention. [Figure 9] FIG. 10 is a cross-sectional view of a tillage tine according to a fifth embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view of a tillage tine according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] A first embodiment of the present invention will be described with reference to FIGS.

[0013] In Figure 1, 1 is an agricultural implement, which is, for example, a rotary tiller that is connected to the rear of a tractor (not shown), which is a traveling vehicle, and performs tilling and leveling work (agricultural work) while moving forward in the direction of travel across a field as the tractor travels.

[0014] The agricultural work machine 1 comprises a body 2 that is detachably connected to a three-point link at the rear of the tractor, a tillage body (rotary) 3 that is rotatably mounted on the body 2 and performs tilling work while rotating in a predetermined direction (for example, the down-cutting direction) around a rotation center P, which is a horizontal left-right rotation center axis, and a soil leveling body (leveling plate) 4 that is rotatably mounted on the body 2 in the vertical direction and performs soil leveling work behind the tillage body 3.

[0015] The machine body 2 has a three-point linkage (traveling vehicle linkage) 11 that is detachably connected to a three-point link at the rear of the tractor. The three-point linkage 11 has one top mast 12 and two lower arms 13, one on the left and one on the right.

[0016] The machine body 2 also has a transmission case 17, which is a shaft holder that rotatably holds an input shaft 16 that is connected via a joint to the PTO shaft at the rear of the tractor. Attached to the left and right sides of the transmission case 17 are inner ends of frame pipes 18, which are round pipe-shaped frames that extend in the left-right direction.

[0017] Furthermore, a chain case 19, which serves as one of the tillage unit support parts, is attached to the outer end of the left frame pipe part 18, and a bracket part (not shown), which serves as the other of the tillage unit support parts, is attached to the outer end of the right frame pipe part 18. The tillage unit 3 is rotatably mounted between the left and right chain case parts 19 and bracket parts, which are spaced apart and facing each other. Side cover plates 20 are attached to the chain case part 19 and bracket parts.

[0018] The machine body 2 also has a tilling cover section 21 that covers the upper part of the tilling body 3. The soil leveling body 4 is mounted at the rear end of the tilling cover section 21 so that it can rotate up and down around a support shaft 22 that extends in the left-right direction. Between the soil leveling body 4 and the machine body 2, a ground pressure adjusting means 23 is installed to adjust the ground pressure of the soil leveling body 4 against the field surface, and a gauge wheel 24 is provided at the front of the machine body 2.

[0019] The tillage body 3 has a tillage shaft 31, which is a horizontal rotating shaft (drive shaft) that rotates in a predetermined direction around a rotation center P based on power (rotational power) from the input shaft 16. The tillage shaft 31 has a shaft main body 32 in the form of a round shaft that is elongated in the left-right direction, and flanges 33 that are plate-shaped claw mounting portions that protrude from the outer peripheral surface of the shaft main body.

[0020] Tillage tines 35, which are multiple work tines that perform tilling work while rotating in a predetermined direction (predetermined rotation direction) around the rotation center P together with the tillage shaft 31, are detachably attached to each flange portion 33 of the tillage shaft 31 by attachment means (for example, bolts and nuts, etc.). Note that the claw attachment portion of the tillage shaft 31 is not limited to the flange type, and may be, for example, a holder type.

[0021] Here, the cultivator tines (multiple-stepped tines) 35 attached to the cultivator shaft (rotating shaft) 31 of the agricultural work machine 1 will be described in detail.

[0022] As shown in Figures 2 to 5, the tillage claw 35 comprises a curved plate-shaped claw main body 41 that rotates in a predetermined rotational direction around a predetermined rotation center (tilling shaft core) P when attached to the tillage shaft 31, and a hard portion 42 which is a built-up wear-suppressing portion that is harder and has better wear resistance than the claw main body 41 and is attached to the claw main body 41 by welding or the like.

[0023] The claw main body (base material) 41 is made of a metal material such as SUP6. The hard portion (welding material) 42 is a hard alloy portion made of a metal material (such as a metal material made by mixing steel with carbide, tungsten, chromium, nickel, etc.) that is harder and lighter than the metal material that makes up the claw main body 41.

[0024] When the hard portion 42 is provided on the nail main body 41 by welding, for example, a predetermined amount of powder of the hard metal material (welding powder material) that will form the hard portion 42 is placed on a predetermined portion (the portion on the cutting edge side that is not sharpened) of the flat nail main body 41 before bending, and then the powder is melted by heat and welded.

[0025] More specifically, the method for manufacturing the tillage tines 35 includes a step-forming step in which a plurality of step portions 51, 52 are formed in the flat tine body 41 before bending, for example, on the portion of the blade edge side that is not sharpened, and a welding step in which, after this step, a predetermined amount of welding powder material that is harder and lighter than the metal material constituting the tine body 41 is placed on the upward-facing step portions 51, 52 and heated to weld the hard portions 42 to the step portions 51, 52 so that they have a surface that functions as a sharpening surface (the inclined surface 77 described below). Note that while it is preferable to form the hard portions 42 in this manner, other methods such as thermal spraying, plasma powder welding, or laser powder welding may also be used.

[0026] The claw main body 41 is a curved plate-like member having a longitudinal direction that intersects with the direction of rotation, and is composed of three parts that are positioned integrally and continuously in order from the base end side (the side of the rotation center P of the tillage body 3) at one end in the longitudinal direction to the tip end side (the cutting edge side, which is the outer periphery of the tillage body 3) at the other end in the longitudinal direction, namely, an attachment base 46, a vertical blade part 47 and a horizontal blade part 48.

[0027] In other words, the claw body 41 has an attachment base 46 that is detachably attached to the flange 33 of the tillage shaft 31 by an attachment means, a vertical blade 47 connected to the tip end of the attachment base 46, and a horizontal blade 48 connected to the tip end of the vertical blade 47. The attachment base 46 has a plurality of attachment holes 50 formed therein.

[0028] The claw body 41 curves in the counter-rotation direction (opposite to the rotation direction) from the vertical blade 47 to the horizontal blade 48, and the horizontal blade 48 curves relative to the vertical blade 47 so that it gradually rises from a curve start line L as a base end toward one surface side (one axial side of the tillage shaft 31). The curve start line (rise line) L, where the horizontal blade 48 starts to curve toward the surface side, marks the boundary between the vertical blade 47 and the horizontal blade 48.

[0029] Furthermore, the claw body 41 has a plurality of step portions, for example, two step portions 51, 52, on the cutting edge side (front end side in the rotation direction). That is, the claw body 41 has only a first step portion 51 and a second step portion 52 that are connected to each other as a plurality of step portions (two or more steps) on a predetermined portion of the claw body 41 (a portion on the cutting edge side that is not sharpened).

[0030] The two step portions 51, 52 are provided on at least one of the front surface (one side) and the back surface (the other side) on the cutting edge side of the claw body 41, i.e., for example, only the front surface. Note that the claw body 41 has not been subjected to a sharpening process, and the claw body 41 does not have a sharpening surface (sharpening portion).

[0031] Here, the claw main body 41 has a first portion (portion without steps) 53 whose thickness dimension is constant (including approximately constant; the same applies below) throughout, and a second portion (portion with steps) 54 located on the cutting edge side of the claw main body 41 and including a portion where the thickness dimension changes.

[0032] The first portion 53 has a front surface 56 and a back surface 57 that are parallel to each other, and a ridge-side end face 58 that is perpendicular to the front and back surfaces 56, 57. The second portion 54 has a front surface 61 that is not flush with the front surface 56 of the first portion 53, a back surface 62 that is flush with the back surface 57 of the first portion 53, and a cutting edge-side end face 63 that is perpendicular to the front and back surfaces 61, 62.

[0033] The stepped portions 51, 52 are formed in multiple steps only on the surface 61 of the second portion 54 on the cutting edge side of the claw body 41. As a result, the thickness of the second portion 54 of the claw body 41 decreases in multiple steps toward the cutting edge side. The stepped portions 51, 52 are preferably formed by rolling using a roller, for example, but may also be formed by forging, casting, cutting (machining), or the like, and the method of forming the stepped portions is arbitrary.

[0034] 2(b), the stepped portions 51, 52 are formed longitudinally on the cutting edge side surface of the claw body 41, from the intermediate position of the vertical blade 47 (which may be the base end position instead of the intermediate position) to the tip end position of the horizontal blade 48. In the side view shown in FIG. 2(b), the ends of the stepped portions 51, 52 on the mounting base 46 side are located forward in the rotation direction of the curved surface portion (rib portion) 65 formed on the vertical blade 47.

[0035] The curved surface portion 65 is formed in a curved shape that is convex toward the front side of the vertical blade portion 47 (see FIG. 5). That is, the curved surface portion 65 has a front surface 66 that is convex toward the front side and a back surface 67 that is concave toward the back side. The curved surface portion 65 is elongated along the longitudinal direction of the vertical blade portion 47, and the end of the curved surface portion 65 on the side of the horizontal blade portion 48 is located near the second step portion 52.

[0036] As shown in FIG. 3, each of the first step portion 51 and the second step portion 52 has a first surface 71 that is positioned parallel to the surface opposite the step portion, i.e., the back surface 62 of the second portion 54, and a second surface 72 for forming the step that is connected to the end portion (the upper end portion in FIG. 3) of the ridge side of this first surface 71 in an intersecting manner.

[0037] That is, each of the two step portions 51, 52 is composed of a first surface 71 that is positioned parallel to the back surface 62 of the second portion 54 of the nail main body 41, and a second surface 72 that is positioned at an angle and not parallel to the back surface 62 of the second portion 54 of the nail main body 41. The surface 61 of the second portion 54 is composed of four surfaces (two first surfaces and two second surfaces) that constitute the step portions 51, 52.

[0038] The second surface 72 of the first step portion 51 forms one step (a step having a dimension a shown in FIG. 4) between the first surface 71 of the first step portion 51 and the first surface 71 of the second step portion 52, and the second surface 72 of the second step portion 52 forms another step (a step having a dimension b shown in FIG. 4) between the first surface 71 of the second step portion 52 and the surface 56 of the first portion 53. In other words, the second portion (portion with a step) 54 located on the cutting edge side of the claw body 41 has two steps.

[0039] 4, in the illustrated example, the step dimension (thickness dimension) a of the first step portion 51 is the same as the step dimension (thickness dimension) b of the second step portion 52, but they may be different. Conversely, the width dimension c of the first step portion 51 is different from the width dimension d of the second step portion 52, but they may be the same.

[0040] The width dimensions c and d gradually decrease toward the mounting base 46 in the portions of the step portions 51 and 52 that are located forward in the rotation direction of the curved surface portion 65 in side view. In the example shown in Fig. 4, the thickness dimension of the end portion of the claw body 41 on the cutting edge side is the same as the step dimensions a and b, but they may be different.

[0041] The angle α between the first surface 71 and the second surface 72 of the first step portion 51 is the same as, but may be different from, the angle β between the first surface 71 and the second surface 72 of the second step portion 52. The angles α and β are, for example, between 90 degrees and 170 degrees, and preferably 165 degrees.

[0042] The hard portion (hard metal portion) 42 is inclined so as to cover at least the entirety of the plurality of step portions 51, 52 in the claw main body portion 41, and has an inclined surface 77 which is a functional surface that functions as an inclined sharpening surface.

[0043] That is, for example, the hard portion 42 is provided in an inclined manner on the cutting edge side surfaces of the vertical blade portion 47 and the horizontal blade portion 48 so as to fill the entire two step portions 51, 52. The multiple step portions 51, 52 on the claw main body 41 are made invisible from the outside due to the presence of the hard portion 42 (the presence of the welded metal). Note that, because the inclined surface 77 of the hard portion 42 is formed only by welding a hard metal material, there is no need to sharpen the hard portion 42.

[0044] 2(b), the end of the hard portion 42 on the mounting base 46 side is located at the same position (including approximately the same position; the same applies below) as the ends of both step portions 51, 52 on the mounting base 46 side. The end of the hard portion 42 on the cutting edge side is located at the same position as the ends of both step portions 51, 52 on the cutting edge side. The end of the hard portion 42 on the cutting edge side is located at the same position as the end of the first step portion 51 on the cutting edge side. The end of the hard portion 42 on the ridge edge side is located at the same position as the end of the second step portion 52 on the ridge edge side.

[0045] Although the ends of both are positioned at the same position (in other words, the hard portion and the step portion are aligned with each other), they may be positioned at different positions, for example, shifted by a predetermined distance.

[0046] 2(b), in side view, the width of the portion of the hard portion 42 located on the front side of the curved surface portion 65 in the rotational direction gradually decreases toward the mounting base 46 in accordance with the width of the stepped portions 51, 52. In FIG. 2(b), the hatched portion indicated by diagonal lines is the hard portion 42.

[0047] 3, the inclined surface 77 of the hard portion 42 is curved, for example, formed in a convex curve toward the front surface side. A curved surface 78 that smoothly continues to the inclined surface 77 is provided at the end (the upper end in FIG. 3) on the ridge side of the inclined surface 77. The inclined surface 77 is positioned at an angle with respect to the first surface 71 of the first step portion 51, and is positioned parallel to the second surface 72 of the first step portion 51.

[0048] The thickness of the portion of the hard portion 42 that covers the first surface 71 of the first step portion 51 gradually decreases toward the cutting edge. The thickness of the portion of the hard portion 42 that covers the second surface 72 of the first step portion 51 is approximately constant.

[0049] In Fig. 2, the rising dimension (curvature dimension) W shown in Fig. 2(a) is about 1.0 to 1.2 times (excluding 1.2 times) the vertical distance H (height dimension from the intersection of the curvature start line L and the cutting edge to the cutting edge position) shown in Fig. 2(b). In the example shown in Fig. 2, the rising dimension W is about 95 mm, and the vertical distance H is about 80 mm.

[0050] Next, the operation of the agricultural work machine 1 will be described.

[0051] The agricultural implement 1 is connected to the rear of a tractor, and when the tractor is driven to move the agricultural implement 1 forward (in the direction of travel), the tilling tines 35 of the tilling body 3 rotate together with the tilling shaft 31 to perform tilling work, and behind it the leveling body 4 performs ground leveling work.

[0052] During this operation, the soil in the field flows along the inclined surface 77 on the inclined surface 77 side of the hard portion 42 as shown by the arrow in Figure 4, since there is an inclined surface 77 on the hard portion 42 side that functions similarly to the sharpening surface. However, the inclined inclined surface 77 that functions as the sharpening surface is part of the hard portion 42 and is made of a hard metal material, so it is not easily worn.

[0053] Furthermore, according to the tillage tines (working tines) 35 in such an agricultural work machine 1, the claw main body 41 has multiple step portions 51, 52 on the cutting edge side, and the hard portion (alloy portion) 42, which is harder than the claw main body 41, is arranged in an inclined manner across the multiple step portions 51, 52 so that it has an inclined surface 77 that functions as a cutting surface.As a result, it has better wear resistance than conventional tillage tines, thereby improving durability, and can be made lighter than conventional tillage tines.As a result, the weight of the agricultural work machine 1 equipped with a large number of tillage tines 35 is also lighter, which can improve the matching between the agricultural work machine 1 and the tractor, improve the fuel efficiency of the tractor, and suppress vibration during work.

[0054] Furthermore, since multiple step portions 51, 52 are formed on the cutting edge side of the claw main body 41 rather than just one, it is possible to ensure the desired strength while preventing an increase in tillage resistance, unlike a configuration in which a single step portion is formed and a hard portion is provided at that single step portion.

[0055] Furthermore, the inclined surface 77 of the hard portion 42 is formed in a curved shape (curved surface) that is convex toward the front surface side, which makes it possible to more appropriately improve durability.

[0056] Furthermore, since each of the multiple step portions 51, 52 has a surface that is positioned parallel to the surface opposite the step portion 51, 52, the step portions 51, 52 are easily formed in the step portion forming process, and durability can be more effectively improved.

[0057] In the above embodiment, the case where the hard portion and the step portion coincide with each other has been described. However, as shown in FIG. 6, for example, the two may not coincide with each other, and the distance between the edge of the hard portion 42 on the ridge side (ridge side line L1 of the hard portion) and the edge of the second step portion 52 on the ridge side (ridge side line L2 of the step portion) may gradually increase toward the cutting edge side.

[0058] In this configuration, the hard portion 42 has a first hard portion 42a that covers a portion of the surface 56 of the first portion 53 of the nail body 41, and a second hard portion 42b that covers the entire surface 61 of the second portion 54 of the nail body 41. Although not shown, for example, the ridge side line of the hard portion and the ridge side line of the step portion may be positioned parallel to the ridge edge line of the nail body in a side view from the end on the attachment base side to the end on the cutting edge side.

[0059] 7, the angle between the first surface 71 and the second surface 72 may be 90 degrees, and the step portions 51, 52 may be stepped. In the example shown in Fig. 7, both of the two step portions 51, 52 are at 90 degrees, but for example, only one of the step portions may be at 90 degrees.

[0060] 8, for example, a configuration may be adopted in which a sharpening surface 81 is formed on the back surface 62 of the second portion 54 of the claw main body 41. Note that, for example, a configuration in which a sharpening surface is formed on the front surface 61 of the second portion 54, or a configuration in which a sharpening surface is formed on both the front and back surfaces 61, 62 of the second portion 54, etc. may also be adopted.

[0061] 9, the end surface 63 of the second portion 54 of the nail main body 41 may be covered by the hard portion 42. In this case, the hard portion 42 has an end surface cover portion 82 that covers the end surface 63. Note that the hard portion 42 may extend to the back surface 62 of the second portion 54, for example.

[0062] 10, for example, a configuration may be adopted in which step portions 51, 52 are formed on both surfaces (both one side surface and the other side surface) of the claw main body 41, i.e., on both surfaces of the front and back surfaces 61, 62 of the second portion 54 of the claw main body 41, and hard portions 42 are welded to the step portions 51, 52 on both surfaces. In other words, a configuration may be adopted in which a plurality of step portions are formed on at least one of the front surface and the back surface on the cutting edge side of the claw main body, and hard portions are provided in the formed step portions so as to fill in part or all of the step portions.

[0063] Furthermore, the number of steps in the step portion may be any number, for example, three or more. Also, the step portion may have a rounded surface or a chamfered portion, for example.

[0064] Furthermore, for example, a paint layer may be provided on the entire outer surface of the tillage tine, and in this case, two paint layers of different colors may be provided so that the tine main body and the hard portion have different colors.

[0065] Furthermore, although the working tines have been described as being those used in rotary tillers, they can also be applied to tines used in agricultural machines such as plows, ridgers and mowers.

[0066] Although several embodiments and modifications of the present invention have been described, it is also possible to combine the embodiments and modifications as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0067] 1 Agricultural machinery 35 Cultivation tines, which are working tines 41 Claw body 42 Hard part 51 First step 52 Second step 71 Page 1 72 2nd page 77 Slope

Claims

1. A work claw used in an agricultural machine, A claw main body portion, a hard portion harder than the nail main body portion, The claw body has a plurality of step portions in a portion of the claw body that is not sharpened, The hard portion is provided across the plurality of step portions. A working claw characterized by:

2. The edge-side end of the hard portion is shifted toward the edge side with respect to the edge-side end of the step portion located closest to the edge side among the plurality of step portions.

2. The work claw according to claim 1.

3. A method for manufacturing a work claw used in an agricultural machine, a step portion forming step of forming a plurality of step portions in an unsharpened portion of the nail main body; a welding step of welding a hard portion to the plurality of step portions using a welding powder material harder than the claw main body portion; A manufacturing method of a working claw, comprising:

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