JP3935404B2 - Method for producing tine for turf surface drilling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a tine that is mounted on a turf surface drilling machine and pierces vent holes in the turf surface.
[0002]
[Prior art]
As one of the management of lawns such as golf courses, ventilating holes are drilled almost perpendicularly to the turf surface (also called “aeration” in the industry) to improve the air permeability of the lawn and improve the soil There is something that makes the growth better. As a machine that performs this management work, a turf surface drilling machine equipped with a large number of drilling tools called “tines” is run, and vent holes are drilled in the turf surface by raising and lowering the tine relative to the turf surface. Yes.
[0003]
Here, as shown in FIG. 10, the basic structure of the conventional tine T ′ is a cylindrical piercing portion 10 and a core discharge having a substantially semi-cylindrical shape by opening a part of the cylindrical body in the circumferential direction. The portion 20 and the attached portion 30 attached to the holder K are integrally provided in the above order from the lower end to the upper end, and the holder K is attached to the rear portion of the turf surface drilling machine. It is mounted via. In FIG. 10, the attached portion 30 at the upper end portion of the tine T ′ is inserted into the attachment hole 1 opened in the lower surface of the holder K, and is fixed to the fixing bolt 2 that is horizontally screwed from the side surface of the holder K. It is fixed to the holder K by the tip part coming into contact.
[0004]
As one of the turf surface punching machines, as shown in FIGS. 11 and 12, a predetermined interval is provided along the lateral direction (direction orthogonal to the traveling direction P of the body 70), and the traveling direction P is A pair of rotating disks 71 and 72 are arranged in a state where the rotation axis is shifted along the plurality of holders K arranged in the lateral direction in the same phase portion along the circumferential direction of each rotating disk 71 and 72. Are connected to each other via a connector 73 and a bearing 74, and a plurality of tines T ′ are attached to each holder K in a vertical posture. When the body 70 advances in the direction of the arrow P, the pair of rotating disks 71 and 72 has a tine T ′ attached to the pair of rotating disks 71 and 72 piercing the turf surface 3. The tine T ′ retreats relative to the aircraft, and the piercing portion 10 at the lower end of the tine T ′ draws a circular trajectory indicated by a one-dot chain line in FIG. Can be rotated. Therefore, the tine T ′ becomes almost stationary and pierces the turf surface 3 in order to come out after being pierced by the predetermined depth with respect to the turf surface 3. 11 and 12, reference numeral 75 denotes a rotation axis of each of the rotary disks 71 and 72 supported by the frame 76 of the body 70.
[0005]
Further, the piercing action of the tine T ′ itself is as follows. That is, in FIG. 10, when the cylindrical piercing portion 10 at the lower end pierces the turf surface 3, the soil is separated into the core passage 11 inside and separated from the surrounding soil, and enters the core passage 11. The core S, which is a short columnar separated soil, is pushed upward with respect to the tine T ′ by piercing pressure, and the discharge opening 21 of the core discharge portion 20 having a substantially semi-cylindrical shape occupying most of the tine T ′. Is discharged toward the rear of the aircraft.
[0006]
As described above, most of the tine T ′ is the core discharge portion 20 having a substantially semi-cylindrical shape, and the upper end portion of the core discharge portion 20 is a holder in a state where the tine T ′ is mounted on the holder K. Close to K. The tine T ′ is simultaneously subjected to compressive force, bending force, buckling force and the like at the time of piercing. For this reason, for example, the bending force having the greatest influence increases as the holder K that is the support portion approaches, and the upper end portion of the core discharge portion 20 has a remarkably large section modulus compared to the solid portion immediately above it. Despite being small, a large bending force acts. Thus, the tine T ′ has a structure that is weak against bending force due to its shape. In particular, in the conventional tine T ′, the thickness of the bottom portion 22 facing the discharge opening 21 of the core discharge portion 20 is the same as that of the piercing portion 10 over the entire length, as shown by a two-dot chain line in FIG. As a result, the structure was weaker against bending force. In addition, in FIG. 10, 4 shows a lawn.
[0007]
[Problems to be solved by the invention]
The subject of this invention is provision of the manufacturing method of the tine for turf surface drilling with high intensity | strength with respect to bending force etc.
[0008]
[Means for Solving the Problems]
The invention of claim 1 for solving the above-described problems is directed to a cylindrical piercing portion, a core discharge portion having a substantially semi-cylindrical shape in which a part of the cylindrical body is opened in a circumferential direction, and a holder. A method for manufacturing a turf surface drilling tine in which three parts of a mounted part to be attached are integrally provided in the above order from the lower end to the upper end, and one end of a solid round bar as a material is drilled Forming a pierced part by processing into a cylindrical shape, and a core that is connected to the pierced part after the process and is partially semi-cylindrically opened by milling Forming a discharge portion, and setting the height of the piercing portion side of the solid round bar to be higher so that the thickness of the bottom portion of the core discharge portion is changed from the piercing portion to the attached portion. It is characterized by being gradually thickened toward.
[0009]
According to the invention of claim 1, the thickness of the bottom portion facing the discharge opening in the core discharge portion is changed from the piercing portion to the attached portion only by setting the solid round bar as the material slightly inclined. The core discharge portion of the turf surface drilling tine according to claim 1 which is gradually thicker toward the end can be processed. Moreover, compared with the case where the thickness of the bottom part of a core discharge | emission part is constant, the cutting amount by a milling process decreases and processing efficiency also increases.
[0010]
Further, the invention of claim 2 is a cylindrical piercing portion, a core discharge portion having a substantially semi-cylindrical shape in which a part of the cylindrical body is opened in a circumferential direction, and a mounted portion attached to the holder. Is a method for manufacturing a turf surface drilling tine that is integrally provided in the above order from the lower end to the upper end, and is milled to a pierced portion at the tip of a pipe-shaped hollow round bar as a material. A step of forming a core discharge part having a substantially semi-cylindrical shape by opening a part of the cylindrical body in the circumferential direction, and setting the milling part side of the hollow round bar to be higher By performing the processing, the thickness of the bottom portion of the core discharge portion is gradually increased from the piercing portion toward the attached portion.
[0011]
According to the invention of claim 2, the thickness of the bottom portion facing the discharge opening in the core discharge portion is attached from the piercing portion only by setting the pipe-shaped hollow round bar, which is a material, slightly inclined. The core discharge portion of the turf surface drilling tine according to claim 1, which is gradually thicker toward the portion, can be processed. Moreover, compared with the case where a raw material is a solid round bar, the cutting amount by milling is significantly reduced, and the processing efficiency is increased.
[0012]
[0013]
[0014]
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments. The same parts as those described in the section “Prior Art” are denoted by the same reference numerals, and only the parts unique to the present invention will be described to avoid redundant description. FIG. 1 is a perspective view of a tine T ₁ manufactured by the method of the invention of claim 1 , FIG. 2 is a partial vertical sectional view, and FIGS. 3 (A), (B), (C) are FIG. _{3 is an} enlarged sectional view taken along line A ₁ -A _1, line A ₂ -A _{2 and} line A ₃ -A _{3 in} FIG. 2, respectively.
[0016]
In the tine T ₁ manufactured by the method of the invention of claim 1, the thickness (t) of the bottom portion 22 of the core discharge portion 20 gradually increases from the piercing portion 10 toward the attached portion 30. The core discharge unit 20 is formed by milling according to a method described later, and the start point and the end point of the horizontal linear movement of the milling cutter FC (in FIG. 6, the X axis on which the center (C ₁₁ ) of the milling cutter FC is located, respectively. (L ₁ ) is the distance between the (X ₁ ) and (X ₂ ) points in the direction (horizontal direction), and the X-axis direction in which the center (C ₁₁ ) of the milling cutter FC is located in FIG. When the thickness of the bottom portion 22 of the core discharge portion 20 at each point of (X ₁ ) and (X ₂ ) is (t ₁ ) and (t ₃ ), respectively, it faces the discharge opening 21 in the bottom portion 22. The bottom surface 22a is inclined by (θ) with respect to the axis (C ₀ ) of the tine T ₁ (see FIG. 6). Here, [tan θ = (t ₃ −t ₁ ) / L ₁ ], and in the drawing showing the processed state of the core discharge portion 20 in FIG. 6, the bottom surface 22a facing the discharge opening 21 in the core discharge portion 20 is , Horizontal.
[0017]
2 and 3, C ₁ , C ₃ , and C ₂ are respectively circular arc shapes of the core discharge portion 20 of the tine T ₁ at the start point, the end point, and the middle point of the horizontal linear movement of the milling cutter FC. (T ₂ ) is the thickness of the bottom portion 22 of the Tine T ₁ core discharge portion 20 at the midpoint between the start point and the end point of the horizontal linear movement of the milling cutter FC. Thus, it can be seen that the thickness (t) of the bottom portion 22 of the core discharge portion 20 gradually increases from the piercing portion 10 toward the attached portion 30. Further, as shown in FIG. 2, the length (L ₂ ) from the tip (lower end) of the piercing portion 10 at the tip portion (lower end) of the tine T ₁ facilitates piercing the turf surface 3. Furthermore, the tip end side is narrowed so as to have a slightly small diameter to form a gently tapered portion 12, and the outside of the tip portion of the gently tapered portion 12 is chamfered to form a sharpened portion 13.
[0018]
Next, with reference to FIGS. 4 to 7, a method for manufacturing the tines T _1. Figure 4 (a) to (e) are views showing a sequence of tines T ₁ of the manufacturing process, FIGS. 5 and 6, the front at each time point of the start and end forming the core discharge unit 20 by milling FIG. 7 is a partial sectional view, and FIG. 7 is a sectional view taken along line BB in FIG. After forming the attached portion 30 by providing a stepped portion by lathe processing at one end portion in the longitudinal direction of the solid round bar M ₁ which is the material shown in FIG. 4 (a), the solid round bar M ₁ A core passage 11 is formed in the piercing portion 10 at the other end in the longitudinal direction by drilling [FIG. 4 (b)]. Next, a portion serving as the longitudinal piercing portion 10 of the other end of the solid round bar M ₁ in the core passage 11 is opened, the length from the end surface of the other end (lower end surface in use) In the portion (L ₂ ), a gentle taper portion 12 is formed by drawing so that the end face side is slightly narrowed by drawing (FIG. 4C). Next, chamfering is performed by lathe processing at a slight distance (L ₃ ) from the end face of the gently tapered portion 12 to form a sharpened portion 13 at the tip portion of the piercing portion 10 (FIG. 4D). . Finally, a discharge opening 21 is provided by milling between the piercing portion 10 and the attached portion 30 to form the core discharge portion 20 (FIG. 4 (e)).
[0019]
Next, the process of forming the core discharge part 20 by milling will be described in more detail. Only the core discharging part 20 fixes the unprocessed solid round bar M ₁ firmly between the fixed base 41 and the movable base 42 of the vice 40. Here, a mounting support surface 43 for mounting and supporting the solid round bar M ₁ is formed on the fixed base 41 of the vice 40, and the mounting support surface 43 extends along the transverse direction thereof. , together with a horizontal, along its longitudinal direction, the bottom surface 22a facing the discharge opening 21 in the bottom 22 of the core discharge unit 20 of the tines T ₁ is, tines T ₁ of the axis to the (C ₀₎ It is inclined by an angle (θ) that is inclined with respect to it. Then, as shown in FIG. 5, the processed piercing portion 10 side is made higher so that only the core discharging portion 20 has the unprocessed solid round bar M ₁ of the fixed base 41 constituting the vice 40. As shown in FIG. 7, the both sides thereof are firmly sandwiched and fixed between the fixed base 41 and the movable base 42 as shown in FIG. In this state, as shown in FIG. 5 and FIG. 6, the axis (C ₀ ) of the solid round bar M _{1 that} is not processed by only the core discharging part 20 is the angle (θ) with respect to the horizontal line H. Inclined.
[0020]
Then, as shown in FIG. 5, the milling cutter FC having a diameter (D) is moved to the horizontal linear movement start position [in FIG. 5, the X-axis direction (horizontal direction) of the center (C ₁₁ ) of the milling cutter FC. The solid coordinates of the solid round bar M ₁ are cut by lowering from the position directly above the position (X ₁ ) along which the coordinates follow. When the cutting edge on the outer periphery of the milling cutter FC reaches the inner peripheral surface of the core passage 11 formed in the piercing portion 10 by drilling [in the Z-axis direction (vertical at the center (C ₁₁ ) of the milling cutter FC at this time) The coordinate along the direction is (Z ₀ )], and the descent of the milling cutter FC is stopped. Thereafter, the milling cutter FC is moved in a horizontal straight line by the distance (L ₁ ), and the solid round bar The solid portion of M ₁ is cut to form the core discharge portion 20, and after moving horizontally by the distance (L ₁ ), the core is lifted up and retracted from the solid round bar M ₁ . In the illustrated example, the milling cutter FC is an upper cut.
[0021]
In this way, the core discharge portion 20 is formed by horizontally moving the milling cutter FC with respect to the solid round bar M ₁ arranged with the axis (C ₀ ) inclined by the angle (θ). In addition, the thickness of the bottom portion 22 facing the discharge opening 21 gradually increases from the piercing portion 10 toward the attached portion 30 as shown in FIGS. 2 and 3, and the bottom portion of the core discharge portion 20. A portion connected to the piercing portion 10 in 22 is a continuous surface. In a specific embodiment, when the outer diameter and inner diameter of the portion of the piercing portion 10 excluding the gentle taper portion 12 are 16 mm and 13 mm, respectively, that is, when the thickness of the portion of the piercing portion 10 is 1.5 mm. In the above, (L ₃ ) was 55 mm and (t ₃ -t ₁ ) was 1.5 to 2 mm. Further, the rate of change in thickness per unit length of the bottom 22 of the core discharge unit 20 is determined by changing the inclination along the longitudinal direction of the mounting support surface 43 of the vice 40, that is, the material in the set state. This can be freely changed by changing the inclination state of the axis (C ₀ ) of the solid round bar M ₁ . In FIG. 3, a two-dot chain line indicates an outline before processing the solid round bar M ₁ that is a raw material.
[0022]
In this regard, in the conventional tine T ′, when the core discharge portion 20 ′ is formed, the solid round bar M ₁ is horizontally arranged and the milling cutter FC is moved in a horizontal straight line. The thickness of the bottom 22 'facing the opening 21 is constant over the entire length. For this reason, in the tine manufacturing method according to the first aspect of the present invention, it is possible to easily change the thickness of the bottom portion 22 facing the discharge opening 21 in the core discharge portion 20 and to form the core discharge portion 20. As a result of reducing the amount of cutting at the time of machining, there is also an advantage that the machining efficiency is increased.
[0023]
In addition, after finishing the core discharge part 20 by milling, the peripheral part of the discharge opening 21 is corrected and deburred using a sander, and the entire heat treatment of the tine T ₁ is performed. .
[0024]
Thus, in the tine T ₁ manufactured by the method of the invention of claim 1, the thickness of the bottom portion 22 facing the discharge opening 21 in the core discharge portion 20 gradually increases from the piercing portion 10 toward the attached portion 30. Since it is thick, one side (the back side in use) is opened as a discharge opening 21, so that the core discharge part 20 whose section is a semi-ring shape, particularly a core discharge part on which a large bending force acts The strength of the upper end portion of 20 is greatly increased. For this reason, even when the tine T ₁ receives an impact force by directly hitting stones during use, the tine T ₁ is not easily broken and its life is extended. Further, by increasing the strength of the upper end portion of the core discharge portion 20 constituting the tine T ₁ , the inner diameter of the piercing portion 10 at the tip portion (lower end portion) can be increased, and the discharge core amount can be increased. That is, the structure is extremely effective for a large tine. Further, as shown by the solid line in FIG. 10, the bottom 22 of the core discharge part 20 with the discharge opening 21 facing rearward with the tine attached to the holder K is slightly inclined backward. Since the core S is discharged along the inclined surface, the core S is easily discharged (is easily removed).
[0025]
Next, a manufacturing method of tines T ₂ according to the invention of claim 2. Figure 8 (a) to (e) are views showing a manufacturing process of the tines T _2, FIG. 9 is a longitudinal sectional view of tines T ₂ produced by the method of the invention of claim 2. The tine T ₂ is greatly different from the tine T _{1 in} that the tine T ₂ is formed from a pipe-shaped hollow round bar, but the same or equivalent parts as the tine T ₁ are denoted by the same reference numerals. Since the present invention is characterized in that the thickness of the bottom portion of the core discharge portion 20 constituting the tine increases from the piercing portion 10 toward the attached portion 30 side, the tine T ₂ With respect to, illustration of the mounted portion and detailed description thereof will not be given.
[0026]
The wall thickness (t ₁₁ ) of the pipe-shaped hollow round bar M ₂ , which is the material shown in FIG. 8 (a), is the core discharge part constituting the tine T ₂ obtained by processing the hollow round bar M _2. It is the same as the maximum wall thickness (t ₃ ) of the 20 bottom portions 22. First, as shown in FIG. 8 (b), the inner circumference of the hollow round bar M ₂ is turned until the thickness of the portion that becomes the pierced portion 10 at one end in the longitudinal direction becomes (t ₁ ) by lathe processing. Cut the surface. Next, the part where the thickness of one end in the longitudinal direction is (t ₁ ) is calculated from the end face (lower end face in use) to the length (L ₂ ), and the end face side is reduced by drawing. A gentle taper portion 12 is formed by narrowing so as to be slightly thinner (FIG. 8C). Next, chamfering is performed by lathe processing on a portion of the gentle taper portion 12 at a slight distance (L ₃ ) from the end surface, and the tip portion is sharpened, and then one end in the longitudinal direction of the hollow round bar M _{2 being} processed The piercing part 10 in which the hollow part becomes the core passage 11 is formed in the part [FIG. 8 (D)]. Finally, the discharge opening 21 is provided by milling between the piercing portion 10 and the attachment target processing scheduled portion 30 ′ to form the core discharge portion 20 (FIG. 8 (e)).
[0027]
Processing method for forming a core discharge unit 20 between the piercing portion 10 of the processing course of the hollow round bar M ₂ and the attachment part processing scheduled portion 30 'are similar to those of tines T ₁ described above. That is, the pierced portion 10 side is made high so that the axial center C ₀ of the hollow round bar M ₂ being processed is inclined with respect to the horizontal line H by a set angle (θ) and firmly sandwiched by the vice 40, In the state, in the same manner as described above, the hollow round bar M ₂ is milled from the piercing portion 10 side toward the attached portion processing scheduled portion 30 ′. Accordingly, as shown in FIG. 9, the thickness of the bottom portion 22 of the molded core discharge portion 20 is (t ₁ ) at the portion connected to the piercing portion 10. The portion connected to 'remains unprocessed (t ₁₁ = t ₃ ), and gradually becomes thicker from the piercing portion 10 toward the portion to be attached processed portion 30'.
[0028]
Further, when the material is a pipe-shaped hollow round bar M _2, an advantage is obtained in that the amount of cutting at the time of lathe processing for increasing the inner diameter of the piercing portion 10 and the milling processing for forming the core discharging portion 20 can be reduced. There is. In addition, a mounted portion is formed in the mounted portion processing planned portion 30 ′ by inserting and integrating a solid rod having the same outer diameter as the inner diameter.
[0029]
Further, regarding the forming of the core discharge portions 20 of the tines T ₁ and T ₂ , the milling cutter FC has a disk shape, and a blade portion is formed on the outer peripheral portion thereof so that the rotation axis is horizontal, and the outer periphery thereof is formed. Cutting is performed with the blade part of the part. However, it is also possible to process the core discharging portion 20 by a “bottom milling cutter” called “end mill” in which blade portions are provided on the outer periphery and the end surface of the cylindrical body, respectively. In this case, since the outer diameter of the “bottom milling cutter” is smaller than the width of the discharge opening 21 of the core discharge portion 20, the wall thickness gradually increases from the piercing portion 10 toward the attached portion 30. The ratio of the change in the thickness of the bottom portion 22 that gradually becomes thicker from the piercing portion 10 toward the attached portion 30 side by processing the vertical cross-sectional shape of the bottom portion of the core discharge portion 20 that has changed into a curved shape. It is possible to further increase the strength of the upper end portion (portion connected to the attached portion) of the core discharge portion 20 of the tine.
[0030]
【The invention's effect】
The turf surface drilling tine according to the present invention is manufactured by a very simple method in which the tine is set and milled so that the piercing portion side of the solid round bar or hollow round bar as the material is raised. The thickness of the bottom part of the core discharge part which comprises can be gradually thickened toward a to-be-attached part from a piercing part.
[0031]
[Brief description of the drawings]
FIG. 1 is a perspective view of a tine T ₁ manufactured by the method of the invention of claim ₁ ;
FIG. 2 is a partial vertical sectional view of the same.
3A, 3B, and 3C are enlarged sectional views taken along lines A ₁ -A ₁ , A ₂ -A _2, and A ₃ -A _{3 in} FIG. 2, respectively.
FIGS. 4A to 4E are diagrams showing the order of the manufacturing process of tine T _{1 according to} the present invention.
FIG. 5 is a front partial cross-sectional view at the start of molding the core discharge unit 20 by milling.
FIG. 6 is a front partial cross-sectional view at the same end point.
7 is a cross-sectional view taken along line BB in FIG.
FIGS. 8A to 8E are diagrams showing the order of manufacturing steps of tine T _{2 according to} the present invention.
9 is a longitudinal sectional view of a tine T ₂ produced by the method of the invention of claim 2. FIG.
FIG. 10 is an operation explanatory view (a diagram showing a use state) of tine T ₁ manufactured by the method of the invention of claim 2 ;
FIG. 11 is a partial plan sectional view of a pair of rotating disks 71 and 72 constituting a turf surface drilling machine.
FIG. 12 is a side view of the same.
[Explanation of symbols]
t ₁ : thickness on the thin side of the bottom of the core discharge part
t ₃ : Thickness on the thick side of the bottom of the core discharge part
M ₁ : Solid round bar (material)
M ₂ : Hollow round bar (material)
T ₁ , T ₂ : Tyne
3: Turf surface
10: Piercing part
20: Core discharge section
22: Bottom of core discharge
30: Mounted part

Claims (2)

Three parts, a cylindrical piercing part, a core discharging part having a substantially semi-cylindrical shape with a part of the cylindrical body opened in the circumferential direction, and a mounted part attached to the holder, extend from the lower end to the upper end. A method for producing a turf surface drilling tine integrally provided in the above order
A step of forming a pierced portion by processing one end of a solid round bar made of a material into a cylindrical shape by drilling, and after this step, by connecting to the pierced portion and milling, the circumferential direction of the cylindrical body Forming a core discharge portion that is partially semi-cylindrical by being partially opened,
The thickness of the bottom part of the core discharge part is gradually increased from the pierced part toward the attached part by performing the milling by setting the pierced part side of the solid round bar to be higher. A method for producing a tine for turf surface drilling. Three parts, a cylindrical piercing part, a core discharging part having a substantially semi-cylindrical shape with a part of the cylindrical body opened in the circumferential direction, and a mounted part attached to the holder, extend from the lower end to the upper end. A method for producing a turf surface drilling tine integrally provided in the above order
Including a step of forming a core discharge portion having a substantially semi-cylindrical shape by being connected to a piercing portion at the tip of a pipe-shaped hollow round bar, which is a material, by milling. ,
By setting the hollow round bar so that the side of the piercing portion is raised and performing the milling, the thickness of the bottom portion of the core discharge portion is gradually increased from the piercing portion toward the attached portion. A method for producing tine for turf surface drilling.

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