WO2017130958A1 - 木質成形バット及びその製造方法 - Google Patents

木質成形バット及びその製造方法 Download PDF

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Publication number
WO2017130958A1
WO2017130958A1 PCT/JP2017/002330 JP2017002330W WO2017130958A1 WO 2017130958 A1 WO2017130958 A1 WO 2017130958A1 JP 2017002330 W JP2017002330 W JP 2017002330W WO 2017130958 A1 WO2017130958 A1 WO 2017130958A1
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WO
WIPO (PCT)
Prior art keywords
wood
bat
molding
die
molded
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PCT/JP2017/002330
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English (en)
French (fr)
Japanese (ja)
Inventor
恒久 三木
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国立研究開発法人産業技術総合研究所
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Priority to JP2017564265A priority Critical patent/JP6607965B2/ja
Publication of WO2017130958A1 publication Critical patent/WO2017130958A1/ja

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B59/00—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00
    • A63B59/50—Substantially rod-shaped bats for hitting a ball in the air, e.g. for baseball
    • A63B59/52—Substantially rod-shaped bats for hitting a ball in the air, e.g. for baseball made of wood or bamboo

Definitions

  • the present invention relates to a wood molding bat obtained from a wood material and a method for producing the same, and more specifically, a long wood material is pushed into a die mold having an arbitrary extrusion ratio (section reduction rate) and a die angle
  • the present invention relates to a wood-molded bat obtained by extrusion / draw-molding, in which the shape and shape are fixed by continuously forming the structure and cells by shearing and compressing the tissue and cells of the material in the cross-sectional direction of the major axis, and a method for producing the same. is there.
  • the present invention is a rare wooden species and high quality professional wooden bat material
  • a wooden bat that is easy to handle even for beginners of baseball is provided by a simple device and process.
  • a bat is a rod-shaped tool used by a batter to hit a pitcher's pitch in sports such as baseball, softball, and cricket, but its materials include metal materials such as wood, bamboo, and aluminum alloys, Polymer materials such as fiber reinforced resins are used.
  • Wood has been used as a bat material since the birth of baseball, but due to problems such as damage, durability, and heavy mass (ease of use), a lightweight, high-strength, high-durability metal bat has been developed. Furthermore, bats using carbon fiber reinforced resin and urethane coating materials have been developed and used for the purpose of increasing the coefficient of restitution (increase the flight distance of the hit ball).
  • Some wooden bats are cut out from a single piece of wood into a bat shape, some are stuck together and joined into a bat shape, and others are made of bamboo as well as wood. .
  • Wooden baseball bats for professional baseball which use one piece of wood as a rule, are made of hard, rare materials such as ash, hard maple, hickory, white ash, yachidamo, aodamo, and few defects. Since these timbers cannot be supplied continuously in the future, good quality products are currently being stocked by bat makers.
  • the latter joining bat solves the problem of durability and cost that are the challenges of wooden bats, while maintaining the feeling of use of wooden bats, including other official games and professional players except professional baseball. It is also used as a wooden bat for practicing batters.
  • the bats obtained by these methods divide wood fibers with high strength and high deflection inherent in wood in the final shaving process, so there is "breaks" near the bat surface, which is the starting point of rupture in striking Has not been resolved. Moreover, since it becomes heavier than necessary, it is difficult to handle such as a swing with a machined bat having a center of gravity in the head portion.
  • the present inventor can reliably solve the problems of the above-mentioned conventional technology in view of the above-mentioned prior art, and can use one woody material (regardless of tree species, such as cedar and cypress). Including long-lasting fibers (wood grain) using soft coniferous wood), we have earnestly researched on a high-strength, high-durability wood-molded bat with controlled weight and balance and its manufacturing method. As a result, it came to be realized.
  • the present invention eliminates the occurrence of discontinuities (cuts) in the surface wood that significantly reduce the strength and durability in the manufacturing process, and provides a precise difference in density between the late and early wood materials unique to wood materials.
  • An object of the present invention is to provide a bat that has been reduced by making it easier.
  • the wood molded bat of the present invention is a wooden bat made of a wood material having a density of 0.10 to 0.55 g / cm 3 , and the grip portion has an average density other than that of the grip portion. It is characterized by being higher than the average density of the part.
  • the density in one cross section of the grip portion can be higher in the outer edge portion than in the inner portion inside the outer edge portion.
  • it can have a center of gravity at a position near the grip portion in the longitudinal direction.
  • a different material different from the wood material can be inserted in the space.
  • the surface can be impregnated with a thermosetting resin.
  • the manufacturing method of the wood molding bat of the present invention is to apply a squeezing deformation while extruding a long wood material in the longitudinal direction and continuously compressing it from the periphery in the centripetal direction using a die for extrusion. It is characterized by.
  • solid wood or laminated wood can be used as the wood material.
  • a hole extending in the longitudinal direction can be formed in the wooden material.
  • a different material different from the wood material can be inserted into the hole.
  • the wood molding bat of the present invention and the method for manufacturing the same, the following effects can be obtained.
  • (1) It is possible to provide a method for efficiently densifying a wood material by a simple method and a molded body thereof.
  • (2) Even if the wood material before molding is single or divided into a plurality of parts, they can be integrated in the molding process.
  • (3) Mechanical properties such as axial density distribution and strength distribution can be controlled by crafting the cross-section of the wood material before molding.
  • the present invention is a method for manufacturing a bat by forming a long wooden material by applying a shearing force in a compressive stress field.
  • the wooden material has a predetermined extrusion ratio (cross-sectional reduction rate) and a die angle. Push the die into the die, and compress and shear the constituent cells in the die in the centripetal direction and push it out while reducing (decreasing the cross section), and the bearing with the required bat-shaped inner surface at the die outlet (predetermined long material)
  • the cross-sectional dimension provided in the die die is a member having a constant area (including a member that is gradually changed in combination with the die die in this specification).
  • the wood material before molding is supplied to the die die as a single or a plurality of bulk bodies, and the moldability is controlled by impregnating the wood material before molding with resin or the like. Controlling the mechanical characteristics and physical characteristics is a preferred embodiment.
  • the compression / drawing deformation state of the material at the time of molding is controlled, and the cells near the surface of the bat molded in the bearing ⁇ Controlling the overall bulk density and cross-sectional bulk density distribution while ensuring the continuity of the structure, forming a wood material impregnated with resin before molding with a heated die, die temperature, molding speed and
  • a preferred embodiment is to improve the mechanical properties and physical properties of the bat by adjusting the raw material moisture content, the type of resin, the resin concentration and the distribution.
  • the present invention is a method for producing a bat-shaped molded body by deforming a long wood material by applying a shearing force in a compressive stress field, wherein the wood material has a predetermined extrusion ratio (cross section). Reduction rate) and pressed into a die with a die angle, and the constituent cells are compressed and sheared in the centric direction and extruded while reducing (cross section reduced), and densified and strengthened wood molding.
  • a manufacturing method of a bat characterized in that a body is obtained, and further, by arranging a heating jig such as a bearing having an inner surface of the outer shape of the bat at the die outlet, the bat cross-sectional shape and the axial direction are arranged.
  • a desired high-density, high-strength bat having a bulk density distribution is obtained.
  • the molding method may be a method of pushing a material into a mold.
  • a backward extrusion molding method in which a material is deformed and molded in a direction opposite to the pressing direction, and a forward extrusion molding method in which the material is moved in the same direction as the pressing direction are illustrated.
  • the present invention is not limited to this, and any molding method equivalent to or similar to these, or any other molding method capable of extrusion molding or the like can be used.
  • the woody material is not particularly limited, and specifically, for example, coniferous trees, hardwoods, and bamboo are exemplified as particularly suitable materials.
  • a long wooden material is deformed by applying a shearing force in a compressive stress field to produce a bat-shaped formed body, wherein the wooden material is extruded at a predetermined extrusion ratio (The material deformation is mainly in the vicinity of the die, because it is pushed into a die with a cross-sectional reduction rate) and a die angle, and the constituent cells are extruded and compressed (shear reduced) by compressing and shearing the constituent cells in the die. Proceeds predominately.
  • the wood before molding is formed by molding with the connecting member inserted into the above-mentioned holes, etc.
  • the fiber is hardly broken during the molding process, so that the original fiber structure can be provided on the bat surface. Also, since the fiber structure of the bat surface is densified and smoothed to the same extent as the mold surface properties, the density of the bat becomes a defect and the density density is improved to improve the strength reliability. Can do.
  • the end grip in order to maintain the continuity of the fibers of the wood material as well as the tapered portion, it can be formed by utilizing the elastic recovery of the densified wood extruded from the bearing.
  • a split mold structure is adopted for the end grip portion and the tapered portion of the mold.
  • a wooden material is pushed into a die mold having a predetermined extrusion ratio (section reduction rate) and a die angle, and the constituent cells are compressed and sheared in the centric direction in the die mold while squeezing (decreasing the section).
  • section reduction rate section reduction rate
  • die angle a predetermined extrusion ratio
  • constituent cells are compressed and sheared in the centric direction in the die mold while squeezing (decreasing the section).
  • the deformation of the wood material prevents the generation of tensile stress, which is a cause of destruction, because the material immediately below the die is held in the compressive stress field by the restriction of the die. Since the shape is imparted by imparting compressive deformation, it is possible to achieve good densification deformation compared to a molding method using uniaxial compression, which has been conventionally performed with ordinary plate-like wood and rod-like wood.
  • a die mold In order to perform the molding using, for example, cedar which is a conifer as a wood material, a die mold (extrusion ratio: 2.6, a die angle of 5.45 °, a die mold) assuming bat molding shown in FIG.
  • a method of pushing a cedar having a water content adjusted to 100 ° C. or more and pushing a cedar having a moisture content adjusted therein is exemplified.
  • the material of the die mold in addition to SKD (alloy tool steel (die steel)) such as SKD11 used in the present embodiment, a hard metal material such as stainless steel used as the material of the die mold, An inorganic material or the like can be used.
  • the cedar that receives a load in the axial (fiber) direction is shaped by being pressed into a die mold and subjected to deformation that decreases in cross section while receiving a compressive force from the mold contact surface in the centripetal direction. Finally, a bat-shaped molded body is obtained as a densified round bar formed by drawing a cedar having a diameter of 50 mm to a diameter of 31 mm (FIG. 2).
  • the continuity of the grain is confirmed from the raw material to the molded product as indicated by the arrows, and the continuity of the fibers in the longitudinal direction is maintained while giving a cross-sectional change in the longitudinal direction.
  • the shaping to the cross-sectional shape is complete.
  • the wood grain confirmed in the material cross section A before molding is narrowed due to compression in the centripetal direction in the molding process, and the density is increased (particularly, molding). It is understood that the degree of compression is higher near the surface.
  • the properties and the like of the bat molded body can be arbitrarily controlled by setting the mold temperature, the mold surface finish state, the extrusion speed, the raw material moisture content, the raw material resin impregnation and the like.
  • the surface of the molded body after resin curing is completed is the original raw material of the plant material. While reflecting the continuity of the grain, a very hard and smooth molded product can be obtained.
  • the center of gravity of the bat is the bat head (thick portion).
  • the weight and the position of the center of gravity of the obtained bat can be arbitrarily controlled according to the processing state of the wood material. By utilizing this, it is possible to provide a wooden bat that is easy to swing by bringing the center of gravity of the bat closer to the grip direction. Furthermore, by disposing another material that is difficult to break in the wood material or the like in advance, it is possible to prevent the molded bat from being damaged or fragments from being scattered.
  • a wood material is compressed / drawn to give a bat shape, for example, and preferably has a die angle for molding to press the material into the die shown in FIG.
  • An apparatus provided with a molding means composed of a die mold having an extrusion ratio and a bearing portion for fixing the shape, and a pressurizing means and a heating means attached thereto is used.
  • the shape, structure, shape of the cross section for molding, and the like can be arbitrarily designed according to the required shape, weight, and center of gravity of the bat. Further, by pulling out the molded body from the rear side of the die, it is possible to prevent the buckling of the plant-based material before molding and to reduce the extrusion load. If a bearing that can be divided in the longitudinal direction is used, it is possible to form the grip portion with irregularities.
  • the type of the wood material, the shape and size of the wood material to be supplied to the die, the moisture content, the extrusion load, the temperature time, etc., the molding conditions include the type of the wood material, the cross-sectional shape of the bat and It can be arbitrarily set according to the length, density distribution, required weight, and the like.
  • the method of the present invention is a method conventionally known as an extrusion molding method using plastic deformation of a metal material as a molding method, but the method is a material having high plastic workability such as an aluminum alloy, for example.
  • rate and processing time it was found that even with these materials, a molded body can be produced in an arbitrary cross-sectional shape while maintaining the texture and fiber structure of the raw materials, and as a bat molding technique It has been established.
  • the time required for molding was about 10 seconds.
  • the obtained molded product part was hardly discolored as shown in FIGS. 2C and 2D and maintained the continuity of the grain.
  • maintenance part can be easily changed by adding a bearing behind die die exit (FIG. 2).
  • Changes in bulk density and Brinell hardness accompanying the molding are shown in FIG.
  • bulk density, 0.28g / cm 3 ⁇ 0.69g / cm 3 and the species to be soft material such as cedar is generally used in wooden bat baseball (Maple, Ash, Aodamo, etc.)
  • the density near the surface is higher, and the Brinell hardness is comparable to or surpassing that of the bat material.
  • a raw material roughly cut to a diameter of about 50 mm or less that can be inserted into a die mold was cut out from a cedar (coniferous tree), impregnated with about 38% of a phenol resin, and subjected to an extrusion experiment.
  • a forward extrusion molding method using a die mold having a predetermined die angle, extrusion ratio, and bearing length was used.
  • One material was inserted into a die mold heated to 180 ° C., and the material was directly pressed and deformed by pressing. Thereafter, the mold was cooled and the pressurized material was taken out to obtain a drawn / compressed molded body having a sectional shape reduced from 50 mm to 31 mm.
  • the molded product part had a smooth surface, had gloss, was hardened, and maintained the continuity of the grain.
  • the bulk density and Brinell hardness of the molded part are greatly improved by drawing and compression molding from the material to the molded body, and soft materials such as cedar are generally used for baseball wood. Corresponds to tree species used as bats (Maple, Ash, Aodamo, etc.).
  • both ends of the material are cut so that the starting position of the draw-molded portion is at the center, and the string is attached to the position and balanced.
  • the cedar shaped by cutting is greatly inclined toward the thicker one, whereas the shaping by drawing / compression molding gives a center of gravity near the center.
  • a material that has been rough-processed to a diameter of 50 mm or less that can be inserted into a die mold is cut out from a cedar (coniferous tree), a through hole is made in the longitudinal direction near the center of the cross section, and the material is impregnated with about 38% of a phenolic resin. Then, it was subjected to an extrusion experiment (FIG. 7).
  • FOG. 7 For extrusion molding, a forward extrusion molding method using a die mold having a predetermined die angle, extrusion ratio, and bearing length was used. One material was inserted into a die mold heated to 180 ° C., and the material was directly pressed and deformed by pressing.
  • the mold was cooled and the molded body was taken out to obtain a molded body in which the cross-sectional shape was reduced from 50 mm to 31 mm, and at the same time, the holes provided in the initial stage were closed together with the compression.
  • the size of the hole and the depth in the longitudinal direction By adjusting the size of the hole and the depth in the longitudinal direction, the surface of the molded part with the same diameter is smooth and glossy and hardened, and the density in the longitudinal direction is maintained while maintaining the continuity of the grain.
  • a wood-molded bat having a different distribution (weight per unit volume) is obtained.
  • a material that has been rough-processed to a diameter of 50 mm or less that can be inserted into a die mold is cut out from a cedar (coniferous tree), a through hole is made in the longitudinal direction near the center of the cross section, and the material is impregnated with about 38% of a phenolic resin. And subjected to an extrusion experiment.
  • extrusion molding a forward extrusion molding method using a die mold having a predetermined die angle, extrusion ratio, and bearing length was used. Two materials (a state in which bamboo was inserted into a through hole with a material of 50 mm length) were inserted into a die mold heated to 180 ° C., and the material was directly pressed and deformed by pressing (FIG. 8).
  • FIG. 9 shows a wooden molded bat (cedar and paulownia) obtained as a comparative example and a wooden bat produced by cutting out from maple (bulk density 0.75 g / cm 3 ) as a comparative example.
  • the taper portion by the main extrusion / drawing molding using a material having no discontinuity, it was possible to prevent the constriction of the taper portion from occurring in the paulownia. Moreover, it was confirmed that the adjustment of the bat weight at a practical level can be controlled by the material dimensions and the resin impregnation rate.
  • the present invention relates to a method for molding a wooden material and a molded body thereof, and pushes a long wooden material into a die having an arbitrary extrusion ratio (cross-sectional reduction rate) and a die angle, Mechanical and physical properties in the axial direction by extruding and drawing to fix the shape by shearing and compressing the tissue and cells of the plant-based material in the long-axis cross-sectional direction and continuously crushing the gap while crushing the gap It is possible to produce a compression-molded body having an arbitrary cross-section controlled and to provide a draw-formed bat or the like.
PCT/JP2017/002330 2016-01-27 2017-01-24 木質成形バット及びその製造方法 WO2017130958A1 (ja)

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JP2016012903 2016-01-27

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230193036A1 (en) * 2020-06-30 2023-06-22 National Institute Of Advanced Industrial Science And Technology Flow molding woody material and flow molding material including same and woody molded body
JP7182101B1 (ja) 2022-07-03 2022-12-02 寛治 泉 野球バット及び野球バットを製造する製造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05507635A (ja) * 1990-05-04 1993-11-04 ザ　バウム　リサーチ　アンド　ディベラップメント　カンパニー，インコーポレイテッド 野球用複合材バット
JP2000238012A (ja) * 1999-02-24 2000-09-05 Takeshi Suzuki 木材の圧縮方法、および木炭製造方法
JP2002191739A (ja) * 2000-12-25 2002-07-10 Mizuno Corp 木製バット
JP2006175053A (ja) * 2004-12-22 2006-07-06 Mizuno Corp 野球またはソフトボール用バット
US20110015008A1 (en) * 2009-07-17 2011-01-20 Macdougall & Sons Bat Company, Llc Baseball bat
JP2013005877A (ja) * 2011-06-23 2013-01-10 Yatsufuji Kogyo Kk 球技用打球用具及びその製造方法
JP2013244025A (ja) * 2012-05-23 2013-12-09 Mizuno Corp 野球又はソフトボール用圧縮バット、及び野球又はソフトボール用圧縮バットの製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1082419C (zh) * 1998-03-11 2002-04-10 安善泰 一种提高木材硬度和强度的压缩方法及设备
US10022606B2 (en) * 2014-03-29 2018-07-17 Ernest Haro Training bat

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05507635A (ja) * 1990-05-04 1993-11-04 ザ　バウム　リサーチ　アンド　ディベラップメント　カンパニー，インコーポレイテッド 野球用複合材バット
JP2000238012A (ja) * 1999-02-24 2000-09-05 Takeshi Suzuki 木材の圧縮方法、および木炭製造方法
JP2002191739A (ja) * 2000-12-25 2002-07-10 Mizuno Corp 木製バット
JP2006175053A (ja) * 2004-12-22 2006-07-06 Mizuno Corp 野球またはソフトボール用バット
US20110015008A1 (en) * 2009-07-17 2011-01-20 Macdougall & Sons Bat Company, Llc Baseball bat
JP2013005877A (ja) * 2011-06-23 2013-01-10 Yatsufuji Kogyo Kk 球技用打球用具及びその製造方法
JP2013244025A (ja) * 2012-05-23 2013-12-09 Mizuno Corp 野球又はソフトボール用圧縮バット、及び野球又はソフトボール用圧縮バットの製造方法

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JP6607965B2 (ja) 2019-11-27
TWI704006B (zh) 2020-09-11
TW201737976A (zh) 2017-11-01
JPWO2017130958A1 (ja) 2018-11-22

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