JPH06315863A - Abrasive water jet device - Google Patents
Abrasive water jet deviceInfo
- Publication number
- JPH06315863A JPH06315863A JP10672093A JP10672093A JPH06315863A JP H06315863 A JPH06315863 A JP H06315863A JP 10672093 A JP10672093 A JP 10672093A JP 10672093 A JP10672093 A JP 10672093A JP H06315863 A JPH06315863 A JP H06315863A
- Authority
- JP
- Japan
- Prior art keywords
- abrasive
- water jet
- abrasive grain
- mixing chamber
- pressure water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Nozzles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本願発明は、アブレシブ・ウオー
タジェット装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abrasive water jet device.
【０００２】[0002]
【従来の技術】従来より、例えば金属材料や石材等の比
較的硬質の素材を切断するに際して、例えば図７に示す
ように砥粒を混入した高圧水(例えば３０００kgf／cm2
程度)をノズル先端から噴射し、その高圧・高速のジェ
ット噴流によって切断するアブレシブ・ウオータジェッ
ト装置が開発提供されている。2. Description of the Related Art Conventionally, when cutting a relatively hard material such as a metal material or a stone material, for example, high pressure water mixed with abrasive grains as shown in FIG. 7 (for example, 3000 kgf / cm 2
An abrasive water jet device has been developed and provided which injects (about a certain degree) from the tip of the nozzle and cuts it by the high-pressure, high-speed jet jet.
【０００３】今図７に基づいて、該従来のアブレシブ・
ウオータジェット装置の構成およびその切断方法につて
い説明する。この従来のアブレシブ・ウオータジェット
装置は、同図に示すように、先ず水供給ポンプ１Ａを介
して超高圧ポンプ１Ｂに水を導入し、該超高圧ポンプ１
Ｂから超高圧水供給パイプ２０を介してアブレシブ・ウ
ォータジェットノズル２の高圧室チューブ１５に対して
超高圧水３を供給する一方、砥粒(研磨材)貯留タンク４
から砥粒供給パイプ１９を介して上記ウォータジェット
ノズル２に対して乾式砥粒５を供給する。そして、上記
ウォータジェットノズル２内の砥粒混合室６部分にて上
記高圧室チューブ１５内の高圧室１５aからオリフィス
１３を介して供給される超高圧水噴流７a中に上記乾式
砥粒５を混合し、この乾式砥粒５を含有した超高圧水噴
流７bをさらにノズル部１１を通して収束させた上で被
切断材８に高速で噴射することによって当該被切断材８
を切断するように構成されていた(例えば実開平１−８
１２７４号公報参照)。そして、上記乾式砥粒５には、
例えば平均粒径0.2〜0.8mm程度の硅砂、鋳鉄グリッド、
ガーネット、アルミナ等が用いられていた。Now, referring to FIG. 7, the conventional abrasive
The structure of the water jet device and the cutting method thereof will be described. In this conventional abrasive water jet apparatus, as shown in the figure, first, water is introduced into an ultrahigh pressure pump 1B via a water supply pump 1A, and the ultrahigh pressure pump 1
While supplying the ultra-high pressure water 3 from B to the high pressure chamber tube 15 of the abrasive water jet nozzle 2 via the ultra high pressure water supply pipe 20, the abrasive grain (abrasive) storage tank 4
The dry abrasive grains 5 are supplied from the above to the water jet nozzle 2 through the abrasive grain supply pipe 19. Then, in the abrasive grain mixing chamber 6 portion in the water jet nozzle 2, the dry abrasive grains 5 are mixed in the super high pressure water jet 7a supplied from the high pressure chamber 15a in the high pressure chamber tube 15 through the orifice 13. Then, the ultra high-pressure water jet 7b containing the dry abrasive grains 5 is further converged through the nozzle portion 11 and then jetted at high speed to the material to be cut 8 to be cut.
Was configured to cut (for example, the actual Kaihei 1-8
1274). And, in the dry abrasive grain 5,
For example, silica sand with an average particle size of 0.2 to 0.8 mm, cast iron grid,
Garnet, alumina, etc. were used.
【０００４】ところで、上記ウォータジェットノズル２
の砥粒混合室６は、スリーブ状のノズル本体１０内に嵌
合された砥粒混合室チューブ１２内に上下方向に延びて
設けられており、その底部は、上記ノズル部１１上端側
を漏斗状に削成することによって漏斗状の凹孔部に形成
されている。By the way, the above water jet nozzle 2
The abrasive grain mixing chamber 6 is provided in the abrasive grain mixing chamber tube 12 fitted in the sleeve-shaped nozzle body 10 so as to extend in the vertical direction, and the bottom of the abrasive grain mixing chamber 6 is a funnel at the upper end side of the nozzle portion 11. It is formed into a funnel-shaped recessed hole by cutting it into a shape.
【０００５】そして、当該砥粒混合室チューブ１２の側
方に砥粒導入口１６を形成するとともに該砥粒導入口１
６に対して砥粒導入パイプ１７の一端を接続し、さら
に、該砥粒導入パイプ１７の他端に上記砥粒貯留タンク
４から延設された砥粒供給パイプ１９の下流端を接続し
て構成されている。An abrasive grain introducing port 16 is formed on the side of the abrasive grain mixing chamber tube 12 and the abrasive grain introducing port 1 is formed.
6, one end of an abrasive grain introducing pipe 17 is connected, and the other end of the abrasive grain introducing pipe 17 is connected to a downstream end of an abrasive grain supplying pipe 19 extended from the abrasive grain storing tank 4. It is configured.
【０００６】そして、砥粒供給パイプ１９を通して供給
される砥粒５は、図示のように砥粒導入パイプ１７を介
して砥粒導入口１６から砥粒混合室６内に導入され、オ
リフィス１３によって噴流化された超高圧水噴流７aの
ノズル部１１側への流出負圧によって吸引されてノズル
部１１の収束孔内で同噴流７a中に混入される。そし
て、該砥粒５が混入され増速された収束噴流７bがノズ
ル部１１から被切断材８に噴射される。Then, the abrasive grains 5 supplied through the abrasive grain supply pipe 19 are introduced into the abrasive grain mixing chamber 6 from the abrasive grain introducing port 16 through the abrasive grain introducing pipe 17 as shown in the figure, and are introduced by the orifice 13. The jetted ultrahigh-pressure water jet 7a is sucked by the outflow negative pressure toward the nozzle portion 11 side and mixed into the jet stream 7a in the converging hole of the nozzle portion 11. Then, a convergent jet 7b in which the abrasive grains 5 are mixed and accelerated is jetted from the nozzle portion 11 to the material 8 to be cut.
【０００７】[0007]
【発明が解決しようとする課題】以上のように砥粒５が
混入され、かつノズル部１１で十分に増速された収束噴
流７bを使用すると、切断装置としての切断性能は大き
く向上する。そして、その切断性能は、上記ノズル部１
１から噴射される収束噴流７bに対する砥粒５の混入率
が高いほど高くなる。When the convergent jet 7b in which the abrasive grains 5 are mixed and the nozzle portion 11 is sufficiently accelerated as described above is used, the cutting performance of the cutting device is greatly improved. And the cutting performance is the same as the above-mentioned nozzle part 1.
The higher the mixing rate of the abrasive grains 5 with respect to the convergent jet 7b ejected from No. 1, the higher.
【０００８】しかし、上記従来のアブレシブ・ウオータ
ジェット装置の砥粒混入メカニズムでは、オリフィス１
３からの超高圧水噴流７aに対して砥粒混合室６中での
流出負圧を利用して砥粒５を吸引するだけであるから、
必ずしも十分な砥粒混入率が実現されていない問題があ
る。However, in the above-mentioned conventional abrasive grain mixing mechanism of the abrasive water jet apparatus, the orifice 1
Since the negative pressure of the outflow in the abrasive grain mixing chamber 6 is used to suck the abrasive grains 5 against the ultra-high pressure water jet 7a from 3
There is a problem that a sufficient abrasive grain mixing ratio is not always realized.
【０００９】すなわち、上記従来の構成の場合、砥粒混
合室６内に導入された砥粒５は少なくとも当該混合室６
内では超高圧水噴流７aの周囲に発生した空気の流れに
のっているだけであり、超高圧水噴流７a中には殆んど
混入されず、その下流側のノズル部１１の収束孔内で初
めて混合される。従って、被切断材８に噴射される砥粒
５の速度は高圧水の噴流速度までは加速されず、切断性
能の向上には限界がある。また、ノズル部１１の収束孔
を通過する噴流７bの外周に砥粒層が形成されることか
ら、当該収束孔が摩耗しやすい欠点もある。That is, in the case of the above conventional structure, at least the abrasive grains 5 introduced into the abrasive grain mixing chamber 6 are at least the mixing chamber 6 concerned.
In the inside, it is only on the flow of air generated around the super high pressure water jet 7a, and is hardly mixed into the super high pressure water jet 7a, and inside the converging hole of the nozzle portion 11 on the downstream side thereof. First mixed in. Therefore, the speed of the abrasive grains 5 sprayed on the material 8 to be cut is not accelerated up to the jet speed of the high-pressure water, and there is a limit to the improvement of the cutting performance. Further, since the abrasive grain layer is formed on the outer periphery of the jet 7b passing through the converging hole of the nozzle portion 11, there is a drawback that the converging hole is easily worn.
【００１０】[0010]
【課題を解決するための手段】本願の請求項１〜３各項
記載の発明のアブレシブ・ウオータジェット装置は、上
記従来の問題を解決することを目的としてなされたもの
であって、それぞれ次のように構成されている。SUMMARY OF THE INVENTION The abrasive water jet apparatus according to the inventions described in claims 1 to 3 of the present application has been made for the purpose of solving the above-mentioned conventional problems. Is configured.
【００１１】(１) 請求項１記載の発明のアブレシブ・
ウオータジェット装置の構成 請求項１記載の発明のアブレシブ・ウオータジェット装
置は、オリフィス１３を介し高圧室１５aから高圧水噴
流が供給される砥粒混合室６と、該砥粒混合室６内に高
圧空気流とともに砥粒を導入する砥粒導入通路１７と、
上記砥粒混合室６で上記砥粒が混入された高圧水噴流を
収束加速した上でワークに向けて噴射するノズル部１１
とを備えてなるアブレシブ・ウオータジェット装置にお
いて、上記砥粒導入通路１７に、上流側から下流側に向
けて次第に孔径を縮小したテーパ孔(１９a,２１a,２２
a)を有する絞り部材(１９,２１,２２)を設け、上記テー
パ孔(１９a,２１a,２２a)を介して上記高圧空気流とと
もに導入される砥粒群を噴流状態に収束加速させた上で
上記高圧水噴流に衝突させるようになっている。(1) The abrasive of the invention according to claim 1
Configuration of Water Jet Device The abrasive water jet device according to the present invention is an abrasive grain mixing chamber 6 to which a high pressure water jet is supplied from a high pressure chamber 15a via an orifice 13, and a high pressure inside the abrasive grain mixing chamber 6. An abrasive grain introducing passage 17 for introducing abrasive grains together with the air flow,
Nozzle portion 11 for converging and accelerating a high-pressure water jet in which the abrasive grains are mixed in the abrasive grain mixing chamber 6 and then jetting it toward a workpiece.
In the abrasive water jet apparatus including the above, the abrasive grain introducing passage 17 has tapered holes (19a, 21a, 22) whose hole diameter is gradually reduced from the upstream side to the downstream side.
A throttling member (19, 21, 22) having a) is provided, and after accelerating the abrasive grain group introduced together with the high pressure air flow through the tapered hole (19a, 21a, 22a) into a jet state, It is adapted to collide with the high-pressure water jet.
【００１２】(２) 請求項２記載の発明のアブレシブ・
ウオータジェット装置の構成 請求項２記載のアブレシブ・ウオータジェット装置は、
上記請求項１記載の発明の構成における上記絞り部材２
１が、その下流側開口端部に上流側から下流側に向けて
次第に孔径を拡大したテーパ孔２１bを有している。(2) The abrasive of the invention according to claim 2
Configuration of water jet device The abrasive water jet device according to claim 2,
The diaphragm member 2 in the configuration of the invention according to claim 1
1 has a taper hole 21b whose diameter is gradually increased from the upstream side to the downstream side at the downstream opening end thereof.
【００１３】(３) 請求項３記載の発明のアブレシブ・
ウオータジェット装置の構成 該請求項３記載のアブレシブ・ウオータジェット装置
は、上記請求項１又は２記載の発明の構成における砥粒
導入通路１７を上記砥粒混合室６内の高圧水噴流に対
し、その下流側から上流側方向に向けて傾斜状態に配設
されている。(3) The abrasive of the invention according to claim 3
Structure of Water Jet Device The abrasive water jet device according to claim 3 is characterized in that the abrasive grain introducing passage 17 in the structure according to the invention of claim 1 or 2 is provided for the high pressure water jet in the abrasive grain mixing chamber 6. It is arranged in an inclined state from the downstream side toward the upstream side.
【００１４】[0014]
【作用】本願の請求項１〜３各項記載の発明のアブレシ
ブ・ウオータジェット装置は、上記のように構成されて
いる結果、当該各構成に対応して各々次のような作用を
奏する。As a result of being constructed as described above, the abrasive water jet device of the invention described in each of claims 1 to 3 of the present application has the following effects corresponding to the respective structures.
【００１５】(１) 請求項１記載の発明のアブレシブ・
ウオータジェット装置の作用 請求項１記載の発明のアブレシブ・ウオータジェット装
置では、オリフィス１３を介し高圧室１５aから高圧水
噴流が供給される砥粒混合室６と、該砥粒混合室６内に
高圧空気流とともに砥粒を導入する砥粒導入通路１７
と、上記砥粒混合室６で上記砥粒が混入された高圧水噴
流を収束加速した上でワークに向けて噴射するノズル部
１１とを備えてなるアブレシブ・ウオータジェット装置
において、上記砥粒導入通路１７に、上流側から下流側
に向けて次第に孔径を縮小したテーパ孔(１９a,２１a,
２２a)を有する絞り部材(１９,２１,２２)を設け、上記
テーパ孔(１９a,２１a,２２a)を介して上記高圧空気流
とともに導入される砥粒群を噴流状態に収束加速させた
上で上記高圧水噴流に衝突させることによって、当該高
圧水噴流を適度に乱し、それによって高圧水噴流の中心
に効率良く砥粒を混入させるとともに、絞り部材(１９,
２１,２２)の下流端側開口部を出た所で流路径を拡大さ
せることによって高圧空気流を半径方向外周に拡散させ
て流速を低下させ、該高圧空気流によっては上記高圧水
噴流が不必要に乱されることがないようにしている。(1) The abrasive of the invention according to claim 1
Action of Water Jet Device In the abrasive water jet device according to the first aspect of the invention, the abrasive grain mixing chamber 6 to which the high pressure water jet is supplied from the high pressure chamber 15a through the orifice 13, and the high pressure inside the abrasive grain mixing chamber 6 are provided. Abrasive grain introduction passage 17 for introducing abrasive grains together with the air flow
In the abrasive water jet apparatus, the abrasive grain introduction apparatus is provided with: a nozzle portion 11 for converging and accelerating a high-pressure water jet in which the abrasive grains are mixed in the abrasive grain mixing chamber 6 and jetting it toward a work. In the passage 17, tapered holes (19a, 21a, 21a, 21a,
22a) is provided with a throttle member (19, 21, 22), and the abrasive grains introduced together with the high pressure air flow through the tapered holes (19a, 21a, 22a) are converged and accelerated in a jet state. By colliding with the high-pressure water jet, the high-pressure water jet is appropriately disturbed, whereby the abrasive grains are efficiently mixed in the center of the high-pressure water jet, and the throttle member (19,
(21, 22) expands the flow path diameter at the place where it exits the downstream end side opening, thereby diffusing the high-pressure air flow to the outer periphery in the radial direction and reducing the flow velocity. I try not to be disturbed by necessity.
【００１６】(２) 請求項２記載の発明のアブレシブ・
ウオータジェット装置の作用 請求項２記載のアブレシブ・ウオータジェット装置で
は、上記請求項１記載の発明の構成における上記絞り部
材２１が、さらに、その下流側開口端部に上流側から下
流側に向けて次第に孔径を拡大したテーパ孔２１bを有
して構成されている。(2) The abrasive of the invention according to claim 2
Action of Water Jet Device In the abrasive water jet device according to claim 2, the throttle member 21 in the configuration of the invention according to claim 1 is further provided in the downstream opening end portion from the upstream side to the downstream side. It has a tapered hole 21b whose diameter gradually increases.
【００１７】従って、上記砥粒圧送用の高圧空気流の半
径方向外周への拡散がよりスムーズとなる。Therefore, the high pressure air flow for pressure-feeding the abrasive grains can be more smoothly diffused to the outer periphery in the radial direction.
【００１８】(３) 請求項３記載の発明のアブレシブ・
ウオータジェット装置の作用 該請求項３記載のアブレシブ・ウオータジェット装置で
は、上記請求項１又は２記載の発明の構成における砥粒
導入通路１７を上記砥粒混合室６内の高圧水噴流に対
し、その下流側から上流側方向に向けて傾斜状態に配設
されている。(3) The abrasive of the invention according to claim 3
Action of Water Jet Device In the abrasive water jet device according to claim 3, the abrasive grain introducing passage 17 in the configuration of the invention according to claim 1 or 2 is provided for the high pressure water jet in the abrasive grain mixing chamber 6. It is arranged in an inclined state from the downstream side toward the upstream side.
【００１９】従って、オリフィス１３からの高圧水噴流
に対する砥粒衝突時の食い込み力が高くなり、より砥粒
混入率が向上する。Therefore, the biting force at the time of collision of abrasive particles with respect to the high-pressure water jet from the orifice 13 becomes high, and the mixing ratio of abrasive particles is further improved.
【００２０】[0020]
【発明の効果】以上のように高速で砥粒を水噴流に衝突
させるようにすると、水噴流に対する砥粒の垂直方向速
度成分が大きくなり水噴流中心に砥粒が混入しやすくな
るため、砥粒の加速効率がよくなる。また水噴流表面で
の砥粒の反射の割合が減るため混合特性がよくなる。こ
れらのことより被加工物に衝突する際の砥粒は従来のも
のと比べて高速で高密度になるので、切断性能の向上が
図られる。また、混合は主に混合室内で行なわれるので
アブレシブルノズルのノズル部内の摩耗も軽減される。As described above, when the abrasive particles are made to collide with the water jet at a high speed as described above, the velocity component in the vertical direction of the abrasive particles with respect to the water jet becomes large and the abrasive particles are easily mixed in the center of the water jet. Grain acceleration efficiency is improved. In addition, the ratio of the reflection of the abrasive grains on the surface of the water jet is reduced, so that the mixing characteristics are improved. Due to these facts, the abrasive grains when colliding with the work piece have a higher speed and a higher density than those of the conventional ones, so that the cutting performance can be improved. Further, since the mixing is mainly performed in the mixing chamber, the wear in the nozzle portion of the abrasive nozzle is also reduced.
【００２１】[0021]
(１) 第１実施例 図１〜図４は、本願発明の第１実施例に係るアブレシブ
・ウオータジェット装置の構成とその作用および特性を
示している。(1) First Embodiment FIGS. 1 to 4 show the configuration of the abrasive water jet apparatus according to the first embodiment of the present invention, and its operation and characteristics.
【００２２】すなわち、先ず図１は同装置の高圧室１５
a以下の要部の構成を示しており、符号２はアブレシブ
・ウオータジェットノズル、１０はノズル本体、１２は
砥粒混合室６を形成している混合室チューブ、１３はオ
リフィス、１４は同オリフィス１３を保持するとともに
上記高圧室１５aを形成する図示しない高圧室チューブ
とノズル本体１０とを連結する連結スリーブ、１７は砥
粒導入パイプ(砥粒導入通路)、１６は上記混合室チュー
ブ１２の側部に形成された砥粒導入口であり、これらの
各部の構成は前述した図７の従来例のものと同一であ
る。That is, first, FIG. 1 shows a high-pressure chamber 15 of the apparatus.
a shows the structure of the following essential parts, reference numeral 2 is an abrasive water jet nozzle, 10 is a nozzle body, 12 is a mixing chamber tube forming the abrasive grain mixing chamber 6, 13 is an orifice, and 14 is the same orifice. A connecting sleeve for holding the nozzle body 10 and a high pressure chamber tube (not shown) that holds 13 and forms the high pressure chamber 15a, 17 is an abrasive grain introducing pipe (abrasive grain introducing passage), 16 is the mixing chamber tube 12 side These are the abrasive grain introduction ports formed in the parts, and the configuration of each of these parts is the same as that of the conventional example of FIG. 7 described above.
【００２３】一方、符号１９は、上記砥粒導入パイプ１
７の開口部側に嵌合された砥粒絞り部材であり、本実施
例の場合、該絞り部材１９を介して砥粒導入パイプ１７
下流側空間部１８に収束された砥粒群５０が導入され、
砥粒導入口１６から砥粒混合室６内に供給される。On the other hand, reference numeral 19 is the abrasive grain introducing pipe 1 described above.
7 is an abrasive grain drawing member fitted to the opening side of No. 7, and in the case of the present embodiment, the abrasive grain introducing pipe 17 is provided through the drawing member 19.
The abrasive grain group 50 converged in the downstream space portion 18 is introduced,
It is supplied from the abrasive grain introducing port 16 into the abrasive grain mixing chamber 6.
【００２４】すなわち、該絞り部材１９は、図示のよう
に、その内側に上流側から下流側にかけて次第に内径が
縮小するテーパ孔１９aを有した摩耗硬度の高いスリー
ブ部材よりなっており、前述した砥粒貯留タンク４側の
砥粒供給パイプ１９を介して高圧空気流とともに供給さ
れる乾式砥粒を当該テーパ孔１９aの部分で収束させ高
速噴流化した上で矢印で示すように上記砥粒混合室６内
の超高圧水噴流７aに向けて衝突させ、その衝撃により
超高圧水噴流７aを適度に乱すことにより混合させる。That is, as shown in the drawing, the throttle member 19 is made of a sleeve member having a high wear hardness and having a tapered hole 19a in which the inner diameter is gradually reduced from the upstream side to the downstream side. The dry abrasive grains supplied together with the high-pressure air flow through the abrasive grain supply pipe 19 on the grain storage tank 4 side are converged at the taper hole 19a into a high-speed jet, and then the abrasive grain mixing chamber is indicated by the arrow. It collides toward the ultra-high pressure water jet 7a in 6 and the ultra-high pressure water jet 7a is appropriately disturbed by the impact to mix.
【００２５】この時、上記絞り部材１９の下流側開口端
から吐出される上記砥粒群は、図２に示すように当該開
口端を出た時点で流路径が拡大されることから、圧送用
の高圧空気流は半径方向外周側に拡散して流速が低下
し、慣性の高い砥粒の集合体５０のみが直進して超高圧
水噴流７aに効率よく衝突する。従って、砥粒圧送用の
高圧空気流によって不必要に超高圧水噴流７aが乱され
るという恐れもない。At this time, the abrasive grain group discharged from the downstream opening end of the throttle member 19 has a channel diameter enlarged at the time of exiting the opening end as shown in FIG. Of the high-pressure air flow is diffused to the outer peripheral side in the radial direction and the flow velocity is reduced, and only the aggregate 50 of abrasive grains having high inertia goes straight and efficiently collides with the ultra-high-pressure water jet 7a. Therefore, there is no fear that the ultrahigh-pressure water jet 7a is unnecessarily disturbed by the high-pressure air flow for abrasive grain pressure feed.
【００２６】ところで、その際の絞り部材１９の出口径
であるが、図３に示すように絞り部材１９出口での砥粒
流速は出口径の変化に対してあるピークを持った形で変
化する。従って、本効果を最大に高めるためにはこのピ
ーク位置での出口径を用いる必要がある。我々が行った
実験によると、絞りを設けないときの砥粒流速は約１２
m／s、絞りの出口径φを２mmにしたとき最も砥粒流速が
速くなり約８０m／sであった。また、絞り部材１９を設
ける位置については、超高圧水噴流７aに近づけ過ぎる
と加速された空気流が水噴流を乱してしまい良くない。
また一方、遠ざけ過ぎると一度加速された砥粒が減速し
てしまいこれも良くない。すなわち、砥粒は加速された
状態のままで、空気流は流路拡大により減速される上記
のような位置が最適である。我々が行った実験による
と、この位置(水噴流から絞り部材１９の出口部までの
距離)は本実験例の場合では１６mm前後が最適であっ
た。By the way, regarding the outlet diameter of the throttle member 19 at that time, as shown in FIG. 3, the abrasive grain flow velocity at the outlet of the throttle member 19 changes with a certain peak with respect to the change of the outlet diameter. . Therefore, in order to maximize this effect, it is necessary to use the outlet diameter at this peak position. According to the experiments conducted by us, the flow velocity of the abrasive grains when the diaphragm is not provided is about 12
When the outlet diameter φ of the diaphragm was 2 mm, the abrasive grain flow velocity was the highest and was about 80 m / s. Further, with respect to the position where the throttle member 19 is provided, if it is brought too close to the ultra-high pressure water jet 7a, the accelerated air flow may disturb the water jet.
On the other hand, if it is too far away, the abrasive grains once accelerated will be decelerated, which is also not good. That is, the position where the abrasive grains remain in the accelerated state and the air flow is decelerated by the expansion of the flow path is optimal. According to the experiments conducted by us, this position (the distance from the water jet to the outlet of the throttle member 19) was optimally around 16 mm in the case of this experimental example.
【００２７】以上のように、高速で砥粒を超高圧水噴流
７aに衝突させると、超高圧水噴流７aに対する砥粒の垂
直方向の速度成分が大きくなり超高圧水噴流７aの中心
に砥粒が混入しやすくなるため、砥粒の加速効率がよく
なる。また超高圧水噴流７a表面での砥粒の反射の割合
が減るために混合特性がよくなる。これらのことより被
加工物に衝突する際の砥粒は従来のものと比べて高速で
高密度になるので、切断性能の向上が図れる。また、混
合は主に混合室６内で行なわれるのでノズル部内の摩耗
も軽減させる。As described above, when the abrasive particles collide with the super high pressure water jet 7a at a high speed, the velocity component of the abrasive particles in the vertical direction with respect to the ultra high pressure water jet 7a increases, and the abrasive particles are centered in the ultra high pressure water jet 7a. Are easily mixed, and the acceleration efficiency of the abrasive grains is improved. Further, the mixing characteristics are improved because the proportion of the reflection of the abrasive grains on the surface of the ultra high pressure water jet 7a is reduced. Due to these facts, the abrasive grains when they collide with the workpiece become faster and have a higher density than those of the conventional ones, so that the cutting performance can be improved. Further, since the mixing is mainly performed in the mixing chamber 6, the wear in the nozzle portion is also reduced.
【００２８】ここで、図４に、図１に示した実施例装置
を用い、ワークとしてステンレス(ＳＵＳ３０４)を切断
した時の実験結果を示している。これは上記砥粒加速手
段である絞り部材１９の出口径φをφ＝２mmにし、超高
圧水噴流７aから同絞り部材１９出口までの距離を上述
のように１６mmとした場合の結果である。該実験結果か
らも、上記本実施例の効果の有効性(切断性能の向上)が
証明されている。Here, FIG. 4 shows an experimental result when stainless steel (SUS304) was cut as a work by using the apparatus of the embodiment shown in FIG. This is a result when the outlet diameter φ of the throttle member 19 as the abrasive grain accelerating means is φ = 2 mm, and the distance from the ultrahigh pressure water jet 7a to the outlet of the throttle member 19 is 16 mm as described above. The experimental results also prove the effectiveness of the effects of the present embodiment (improvement of cutting performance).
【００２９】(２) 第２実施例 次に、図５は、本願発明の第２実施例に係るアブレシブ
・ウオータジェット装置の構成を示している。(2) Second Embodiment Next, FIG. 5 shows the construction of an abrasive water jet device according to a second embodiment of the present invention.
【００３０】本実施例の装置では、図示のように上記第
１実施例の絞り部材１９と同様の構造の絞り部材２１の
下流側開口端部に更に逆に上流側から下流側にかけて次
第に内径が拡大する所定長さの第２のテーパ孔２１bを
形成したことを特徴とするものである。In the apparatus of this embodiment, as shown in the drawing, the inner diameter of the throttle member 21 having the same structure as the throttle member 19 of the first embodiment is gradually increased from the upstream side to the downstream side at the downstream opening end. It is characterized in that a second taper hole 21b having a predetermined length to be enlarged is formed.
【００３１】このようにすると、上記絞り部材２１の下
流側端部で流路径拡大により半径方向に拡散される高圧
空気の拡散が上記第２のテーパ孔２１bのガイド作用に
よりスムーズとなり、より有効な作用を果たすようにな
る。With this arrangement, the high-pressure air diffused in the radial direction at the downstream end of the throttle member 21 due to the enlargement of the flow passage becomes smooth due to the guide action of the second tapered hole 21b, which is more effective. Come to function.
【００３２】(３) 第３実施例 さらに、図６は、本願発明の第３実施例に係るアブレシ
ブ・ウオータジェット装置の構成を示している。(3) Third Embodiment FIG. 6 shows the structure of an abrasive water jet device according to the third embodiment of the present invention.
【００３３】本実施例のものは、上記第１実施例と同様
の構成において、砥粒導入パイプ１７および絞り部材２
２を下方側から上方側に向けて傾斜した状態で配設し、
噴射される砥粒の集合体５０を超高圧水噴流７aに鋭角
的に衝突せしめるようにしたことを特徴としている。In the present embodiment, the abrasive grain introducing pipe 17 and the drawing member 2 have the same construction as the first embodiment.
2 is arranged in a state of being inclined from the lower side to the upper side,
The feature is that the aggregate 50 of the abrasive grains to be jetted is made to collide with the ultra-high pressure water jet 7a at an acute angle.
【００３４】このように、高速で噴出される空気流と分
離された砥流の集合体５０を超高圧水噴流７aの下流側
から上流側に向けて衝突せしめるようにすると、上記第
１実施例の場合に比べてより砥粒の混入率を向上させる
ことが可能となる。In this way, when the aggregate 50 of the abrasive flow separated from the air flow ejected at a high speed is made to collide from the downstream side of the ultra high pressure water jet 7a toward the upstream side, the first embodiment described above is obtained. It becomes possible to further improve the mixing ratio of the abrasive grains as compared with the above case.
【００３５】なお、以上の各実施例における絞り部材１
９,２１,２２の各テーパ孔１９a,２１a,２２aの断面形
状は、上述のような円形のものに限られることなく、例
えば円周方向に所定の間隔でスリットを形成したもので
もよい。また、砥粒導入口も１個所に限るものではな
く、半径方向(放射方向)に複数の導入口を設けるように
しても良いことは言うまでもない。The diaphragm member 1 in each of the above embodiments.
The cross-sectional shape of each of the tapered holes 19a, 21a, 22a of 9, 21, 22 is not limited to the circular shape as described above, but slits may be formed at predetermined intervals in the circumferential direction, for example. Further, it is needless to say that the abrasive grain introducing port is not limited to one, and a plurality of introducing ports may be provided in the radial direction (radial direction).
【図１】図１は、本願発明の第１実施例に係るアブレシ
ブ・ウオータジェット装置の砥粒混合部の構成を示す断
面図である。FIG. 1 is a cross-sectional view showing a configuration of an abrasive grain mixing section of an abrasive water jet apparatus according to a first embodiment of the present invention.
【図２】図２は、同砥粒混合部の要部の作用を示す説明
用断面図である。FIG. 2 is an explanatory sectional view showing an operation of a main part of the abrasive grain mixing section.
【図３】図３は、同砥粒混合部の要部の特性関係を示す
グラフである。FIG. 3 is a graph showing a characteristic relationship of a main part of the abrasive grain mixing part.
【図４】図４は、同実施例装置の効果を従来例と対比し
て示すグラフである。FIG. 4 is a graph showing an effect of the apparatus of the embodiment in comparison with a conventional example.
【図５】図５は、本願発明の第２実施例に係るアブレシ
ブ・ウオータジェット装置の砥粒混合部の構成を示す断
面図である。FIG. 5 is a cross-sectional view showing a configuration of an abrasive grain mixing section of an abrasive water jet apparatus according to a second embodiment of the present invention.
【図６】図６は、本願発明の第３実施例に係るアブレシ
ブ・ウオータジェット装置の砥粒混合部の構成を示す断
面図である。FIG. 6 is a cross-sectional view showing a configuration of an abrasive grain mixing section of an abrasive water jet apparatus according to a third embodiment of the present invention.
【図７】図７は、従来のアブレシブ・ウオータジェット
装置の構成を示すシステム図である。FIG. 7 is a system diagram showing a configuration of a conventional abrasive waterjet device.
２はアブレシブ・ウオータジェットノズル、５は砥粒、
６は混合室、１０はノズル本体、１１はノズル部、１２
は混合室チューブ、１３はオリフィス、１５aは高圧
室、１６は砥粒導入口、１７は砥粒導入パイプ、１９,
２１,２２は絞り部材、１９a,２１a,２２aはテーパ孔、
２１bは第２のテーパ孔である、2 is an abrasive water jet nozzle, 5 is an abrasive grain,
6 is a mixing chamber, 10 is a nozzle body, 11 is a nozzle part, 12
Is a mixing chamber tube, 13 is an orifice, 15a is a high pressure chamber, 16 is an abrasive grain introducing port, 17 is an abrasive grain introducing pipe, 19,
21 and 22 are diaphragm members, 19a, 21a and 22a are tapered holes,
21b is a second tapered hole,
Claims (3)
高圧水噴流が供給される砥粒混合室６と、該砥粒混合室
６内に高圧空気流とともに砥粒を導入する砥粒導入通路
１７と、上記砥粒混合室６で上記砥粒が混入された高圧
水噴流を収束加速した上でワークに向けて噴射するノズ
ル部１１とを備えてなるアブレシブ・ウオータジェット
装置において、上記砥粒導入通路１７に、上流側から下
流側に向けて次第に孔径を縮小したテーパ孔(１９a,２
１a,２２a)を有する絞り部材(１９,２１,２２)を設け、
上記テーパ孔(１９a,２１a,２２a)を介して上記高圧空
気流とともに導入される砥粒群を噴流状態に収束加速さ
せた上で上記高圧水噴流に衝突させるようにしたことを
特徴とするアブレシブ・ウオータジェット装置。1. An abrasive grain mixing chamber 6 to which a high pressure water jet is supplied from a high pressure chamber 15a via an orifice 13, and an abrasive grain introducing passage 17 for introducing abrasive grains into the abrasive grain mixing chamber 6 together with a high pressure air flow. In the abrasive water jet apparatus, the abrasive grain introducing passage is provided with a nozzle portion 11 for converging and accelerating a high-pressure water jet in which the abrasive grains are mixed in the abrasive grain mixing chamber 6 and jetting it toward a work. 17 is a taper hole (19a, 2a) whose hole diameter is gradually reduced from the upstream side to the downstream side.
1a, 22a) provided with a diaphragm member (19, 21, 22),
An abrasive characterized in that abrasive grains introduced together with the high pressure air flow through the tapered holes (19a, 21a, 22a) are converged and accelerated in a jet state and then collided with the high pressure water jet. -Water jet device.
部に上流側から下流側に向けて次第に孔径を拡大したテ
ーパ孔２１bを有することを特徴とする請求項１記載の
アブレシブ・ウオータジェット装置。2. The abrasive water jet according to claim 1, wherein the throttle member 21 has a taper hole 21b at an opening end portion on the downstream side thereof, the hole diameter of which gradually increases from the upstream side to the downstream side. apparatus.
の高圧水噴流に対し、その下流側から上流側方向に向け
て傾斜状態に配設したことを特徴とする請求項１又は２
記載のアブレシブ・ウオータジェット装置。3. The abrasive grain introducing passage 17 is arranged in an inclined state with respect to the high-pressure water jet in the abrasive grain mixing chamber 6 from the downstream side toward the upstream side. Two
The described abrasive water jet device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10672093A JPH06315863A (en) | 1993-05-07 | 1993-05-07 | Abrasive water jet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10672093A JPH06315863A (en) | 1993-05-07 | 1993-05-07 | Abrasive water jet device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06315863A true JPH06315863A (en) | 1994-11-15 |
Family
ID=14440796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10672093A Pending JPH06315863A (en) | 1993-05-07 | 1993-05-07 | Abrasive water jet device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06315863A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004092060A (en) * | 2002-08-29 | 2004-03-25 | Ohbayashi Corp | Device and method for drilling hole in reinforced concrete, reinforced concrete member, and method and structure for fixing anchor to hole drilled in reinforced concrete |
| KR100586892B1 (en) * | 1996-07-19 | 2006-08-30 | 꼼미사리아 아 레네르지 아토미끄 | Internal Condensation Vapor Exhaust System |
| KR100945171B1 (en) * | 2009-06-16 | 2010-03-08 | 박성수 | A tool for connecting plates |
| JP2010149204A (en) * | 2008-12-24 | 2010-07-08 | Ihi Amtec Co Ltd | Blast nozzle and blasting method |
| WO2016136443A1 (en) * | 2015-02-25 | 2016-09-01 | 新東工業株式会社 | Nozzle assembly and surface treatment method using said nozzle assembly |
-
1993
- 1993-05-07 JP JP10672093A patent/JPH06315863A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100586892B1 (en) * | 1996-07-19 | 2006-08-30 | 꼼미사리아 아 레네르지 아토미끄 | Internal Condensation Vapor Exhaust System |
| JP2004092060A (en) * | 2002-08-29 | 2004-03-25 | Ohbayashi Corp | Device and method for drilling hole in reinforced concrete, reinforced concrete member, and method and structure for fixing anchor to hole drilled in reinforced concrete |
| JP2010149204A (en) * | 2008-12-24 | 2010-07-08 | Ihi Amtec Co Ltd | Blast nozzle and blasting method |
| KR100945171B1 (en) * | 2009-06-16 | 2010-03-08 | 박성수 | A tool for connecting plates |
| WO2016136443A1 (en) * | 2015-02-25 | 2016-09-01 | 新東工業株式会社 | Nozzle assembly and surface treatment method using said nozzle assembly |
| CN107249821A (en) * | 2015-02-25 | 2017-10-13 | 新东工业株式会社 | Nozzle assembly and the surface treatment method carried out using the nozzle assembly |
| JPWO2016136443A1 (en) * | 2015-02-25 | 2017-11-30 | 新東工業株式会社 | Nozzle assembly and surface treatment method using the nozzle assembly |
| US10322494B2 (en) | 2015-02-25 | 2019-06-18 | Sintokogio, Ltd. | Nozzle assembly and surface treatment method with nozzle assembly |
| CN107249821B (en) * | 2015-02-25 | 2019-09-24 | 新东工业株式会社 | Nozzle assembly and the surface treatment method carried out using the nozzle assembly |
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