JP2010012546A - Grinding fluid purification device and grinding fluid purification method - Google Patents

Grinding fluid purification device and grinding fluid purification method Download PDF

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JP2010012546A
JP2010012546A JP2008174200A JP2008174200A JP2010012546A JP 2010012546 A JP2010012546 A JP 2010012546A JP 2008174200 A JP2008174200 A JP 2008174200A JP 2008174200 A JP2008174200 A JP 2008174200A JP 2010012546 A JP2010012546 A JP 2010012546A
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grinding fluid
grinding
settling
liquid
guide pipe
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JP5201459B2 (en
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Takao Yamoto
孝雄 矢本
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Hitachi Metals Ltd
Neomax Engineering Co Ltd
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Hitachi Metals Ltd
Neomax Co Ltd
Neomax Engineering Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding fluid purification device efficiently removing cutting chips from a grinding fluid without using a filter. <P>SOLUTION: This grinding fluid purification device has: a first setting tank 2 having a plurality of setting tanks 21-25 through which the grinding fluid containing chips is circulated; a guide pipe 50 which is floated on the water surface of the setting tank 25 on the downstream side and which flows the grinding fluid containing a foam substance to which chips are attached toward the bottom surface of the setting tank; a second setting tank 6 in which the grinding fluid sucked from the outlet of the guide pipe 50 is contained; and a returning means for returning the purified grinding fluid from the second setting tank 6 to the storage chamber 26 of the first setting tank 2. The guide pipe 50 may have a plurality of slits 500a at the end edge on the side which the grinding fluid flows in. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、研削加工で発生した切り粉を含む研削液を、フィルターを使用せずに清浄化する研削液浄化装置及びそれを用いた研削液浄化方法に関する。   The present invention relates to a grinding fluid purification device that cleans a grinding fluid containing chips generated by grinding without using a filter, and a grinding fluid purification method using the same.

各種金属製部材を湿式で研削加工する場合、クーラントタンクに収容された研削液(例えば水溶性研削油剤)はポンプで汲み上げられてワークに掛けられた後、再度クーラントタンクに戻される循環システムを採用することが行われている。研削加工後の研削液には、切り粉や砥石粉(砥粒)を含むヘドロ状のスラッジが含まれており、そのままでは、ワークの被加工面に傷(スクラッチ)が発生するので、循環経路の途中に研削液浄化装置を設けて切り粉を除去することが行われている。   When wet grinding various metal parts, a circulating system is adopted in which the grinding fluid (for example, water-soluble grinding fluid) contained in the coolant tank is pumped up and applied to the workpiece and then returned to the coolant tank. To be done. The grinding fluid after grinding contains sludge sludge containing chips and grindstone powder (abrasive grains), and as it is, scratches (scratches) occur on the work surface of the workpiece. A grinding fluid purification device is provided in the middle of removing the chips.

研削加工(又は切削加工)においては、ワークが鉄鋼材料(強磁性体)であれば、例えば永久磁石式クーラントセパレータにより、比較的容易にクーラントから切り粉を分離することができるが、例えばオーステナイト系ステンレス鋼やアルミニウム合金などの非磁性金属材料からなるワークを加工する場合は、ろ材(例えばペーパーフィルター)を使用して研削液をろ過することが一般的である。   In grinding (or cutting), if the workpiece is a steel material (ferromagnetic material), for example, a permanent magnet coolant separator can separate the chips from the coolant relatively easily. When processing a workpiece made of a nonmagnetic metal material such as stainless steel or aluminum alloy, it is common to filter the grinding fluid using a filter medium (for example, a paper filter).

特許文献1には、対流槽内に供給された廃液(切削加工後のクーラント)を下部噴出部から気泡とともに噴出することにより泡状廃液を作り出し、この対流槽から泡状廃液をオーバーフローさせた後、オーバーフローした泡状廃液を濾過部材(アルミ微粉末フィルター)によって濾過することにより、微細切粉を効果的に除去できることが記載されている。しかるに濾過部材(フィルター)を使用する場合には、所定期間使用したフィルターは目詰まりを生じるので、フィルターの定期的な交換や切り粉が付着したフィルター(産業廃棄物)を処理するための費用が発生するという問題がある。   In Patent Document 1, after the waste liquid (coolant after cutting) supplied into the convection tank is ejected together with bubbles from the lower ejection section, the foam waste liquid is created, and after the foam waste liquid overflows from this convection tank In addition, it is described that fine chips can be effectively removed by filtering the overflowed foamy waste liquid through a filtration member (aluminum fine powder filter). However, when a filter member (filter) is used, the filter used for a predetermined period is clogged. Therefore, it is necessary to replace the filter regularly and to process the filter (industrial waste) with chips attached. There is a problem that occurs.

そこでフィルターを使用せずに加工後の切削液から切粉などの異物を分離することが提案されている。例えば、特許文献2には、油性物質および切粉よりなる異物を含む切削液を回収する回収タンクを、仕切板にて区画された2つのタンク槽にて構成し、連続して切削液が流入する第1タンク槽の底面全体にて曝気部により曝気を行い、底面から発生する泡とともに異物を切削液の液面に浮上させて泡に付着させ、異物が付着した泡を仕切板を越えて第2タンク槽へ移動させ、仕切板近傍に位置する回転ドラムの円周面に付着させ、スクレーパで掻き取って集めることにより、異物分離を行うことが記載されている。   Therefore, it has been proposed to separate foreign substances such as chips from the processed cutting fluid without using a filter. For example, in Patent Document 2, a recovery tank that recovers cutting fluid containing foreign substances including oily substances and chips is constituted by two tank tanks partitioned by a partition plate, and the cutting fluid flows continuously. Aeration is performed by the aeration unit on the entire bottom surface of the first tank tank, and foreign matter is floated on the liquid surface of the cutting fluid together with foam generated from the bottom surface, and attached to the foam. It is described that foreign matter separation is performed by moving to the second tank tank, adhering to the circumferential surface of the rotating drum located in the vicinity of the partition plate, and scraping and collecting with a scraper.

また特許文献3には、使用後の水溶性切削油から、混入したごみ及び泡を切削油の表面付近にフロート吸い込み器により集めて、吸引、回収することが記載されている。このフロート吸い込み器は、軸管部が蓋を貫通し多段階に伸縮自在、旋回自在とし、軸管部が固定されたブリッジの両端部のフロートの浮力により、液面の変化に対応して吸込口が自在に上下し、吸込周壁の小切り欠きを有する2対の切り欠きと吸込部内の2対の吸込誘導リブにより、常に表面部の液体のみを効率よく吸引し、ブリッジ端部の1対の翼により、ブリッジ全体が緩やかに回転するよう液体の表面部に水流が生じ、フロート周囲に油が付着しないように構成したものである。   Patent Document 3 describes that dust and bubbles mixed in from the water-soluble cutting oil after use are collected near the surface of the cutting oil by a float suction device, and sucked and collected. This float sucker is designed to allow the shaft tube part to penetrate the lid and to expand and contract in multiple stages, and to rotate, and to absorb changes in the liquid level due to the buoyancy of the floats at both ends of the bridge to which the shaft tube part is fixed. With the two pairs of notches with a small notch in the suction peripheral wall and two pairs of suction guide ribs in the suction part, the liquid at the surface part is always sucked efficiently and a pair of bridge ends The wings are configured so that a water flow is generated on the surface of the liquid so that the entire bridge rotates slowly, and oil does not adhere around the float.

特開2007−125504号公報(第6頁、図1)JP 2007-125504 A (6th page, FIG. 1) 特開2007−152447号公報(第9頁、図2)JP 2007-152447 A (page 9, FIG. 2) 特開平10−309570号公報(第3−4頁、図1)Japanese Patent Laid-Open No. 10-309570 (page 3-4, FIG. 1)

特許文献2に記載された切削液再生装置は、回収タンクに可動部(回転ドラム)を備えており、複雑で大掛かりな装置となる。またこの切削液再生装置で回収した水溶性切削液を再使用するためには、切削油からごみや泡を除去することが必要である。   The cutting fluid regenerating apparatus described in Patent Document 2 includes a movable portion (rotating drum) in a recovery tank, and is a complicated and large-scale apparatus. Moreover, in order to reuse the water-soluble cutting fluid recovered by this cutting fluid regenerating apparatus, it is necessary to remove dust and bubbles from the cutting oil.

特許文献3に記載されたフロート吸い込み器により集めた水溶性切削油を再使用するためには、切削油からごみ及び泡を除去することが必要である。   In order to reuse the water-soluble cutting oil collected by the float suction device described in Patent Document 3, it is necessary to remove dust and bubbles from the cutting oil.

従って本発明の目的は、簡素化された構造でかつ、フィルターを使用せずに加工後の研削液から研削粉を効率よく除去することができる研削液浄化装置を提供することである。   Accordingly, an object of the present invention is to provide a grinding fluid purifying apparatus that has a simplified structure and can efficiently remove grinding powder from a grinding fluid after processing without using a filter.

本発明の他の目的は、フィルターを使用せずに、加工後の研削油から切り粉を分離して、研削液を再使用することができる研削液浄化方法を提供することである。   Another object of the present invention is to provide a grinding fluid purification method capable of separating a cutting powder from processed grinding oil and reusing the grinding fluid without using a filter.

上記目的を達成するために、本発明の研削液浄化装置は、切り粉を含む研削液が所定方向に流動する複数の沈殿室と清浄化された研削液を貯留する貯留室を有する第1沈殿槽と、下流側の前記沈殿室の液面付近に存在する研削液を底面側に向って流動させる案内パイプと、前記案内パイプを通って吸引された研削液が収容される第2沈殿槽と、前記第2沈殿槽から前記貯留室に清浄化された研削液を返送する返送手段を有することを特徴とするものである。   In order to achieve the above object, the grinding fluid purifying apparatus of the present invention includes a first sedimentation chamber having a plurality of sedimentation chambers in which a grinding fluid containing chips flows in a predetermined direction and a storage chamber in which the cleaned grinding fluid is stored. A tank, a guide pipe that causes the grinding liquid existing in the vicinity of the liquid surface of the precipitation chamber on the downstream side to flow toward the bottom surface side, and a second precipitation tank in which the grinding liquid sucked through the guide pipe is stored. And a return means for returning the cleaned grinding fluid from the second settling tank to the storage chamber.

本発明において、前記案内パイプは、研削液が流入する側の端縁部に複数の切り込みを有することが好ましい。   In the present invention, it is preferable that the guide pipe has a plurality of cuts at an end edge portion on the side into which the grinding fluid flows.

本発明において、前記案内パイプは、前記沈殿室の底面との距離を調整可能な支持部材を介して前記第1沈殿槽に設けることができる。   In this invention, the said guide pipe can be provided in a said 1st sedimentation tank through the supporting member which can adjust the distance with the bottom face of the said sedimentation chamber.

本発明において、前記案内パイプは、前記沈殿室の液面に追従して浮遊するフロート部材を介して前記第1沈殿槽に設置することができる。   In the present invention, the guide pipe can be installed in the first sedimentation tank via a float member that floats following the liquid level of the sedimentation chamber.

上記他の目的を達成するために、本発明の研削液浄化方法は、切り粉を含む研削液を複数の沈殿室を有する第1沈殿槽内で所定方向に流動させながら切り粉を沈殿させる沈殿工程と、下流側の前記沈殿室の液面付近に存在する上澄み液を底面側に流動させてから吸引して第2沈殿槽に給送する給送工程と、第2沈殿槽で切り粉を沈殿させた後の上澄み液を回収して前記第1沈殿槽の前記沈殿室から分離された領域に返送する返送工程を含むことを特徴とするものである。   In order to achieve the above-mentioned other object, the grinding fluid purification method of the present invention is a method for precipitating swarf while causing grinding fluid containing swarf to flow in a predetermined direction in a first settling tank having a plurality of sedimentation chambers. And a step of feeding the supernatant liquid present in the vicinity of the liquid level in the precipitation chamber on the downstream side to the bottom side and then feeding it to the second settling tank, and cutting powder in the second settling tank. It includes a returning step of collecting the supernatant liquid after precipitation and returning it to the region separated from the settling chamber of the first settling tank.

本発明によれば、研削加工で発生した切り粉を含む研削油を複数の沈殿室内を流動させて、切り粉の大部分を沈殿させてから、下流側の沈殿室の液面付近に存在する研削液(上澄み液)を案内パイプにより底面側に向って流動させてから、別の沈殿槽に吸引し、そこで再度沈殿させるようにしたので、フィルターを使用せずに、しかも簡素化された構造で、研削液を清浄化することができる。したがってフィルターの交換やその廃棄処分が不要となり、加工コストの削減と環境負荷の低減が可能となる。さらに清浄化された研削液を再使用するので、スクラッチが減少し、加工不良を大幅に低減することができる。   According to the present invention, the grinding oil containing the chips generated in the grinding process is caused to flow in the plurality of settling chambers to precipitate most of the chips, and then exists near the liquid level in the downstream settling chamber. The grinding liquid (supernatant liquid) is made to flow toward the bottom side with the guide pipe, and then sucked into another sedimentation tank, where it is allowed to settle again, so there is no need for a filter and the structure is simplified. Thus, the grinding fluid can be cleaned. Therefore, it is not necessary to replace or dispose of the filter, and it is possible to reduce processing costs and environmental burdens. Furthermore, since the cleaned grinding fluid is reused, scratches are reduced and processing defects can be greatly reduced.

以下、本発明の詳細を添付図面(図1〜図7)を参照して説明する。   Hereinafter, details of the present invention will be described with reference to the accompanying drawings (FIGS. 1 to 7).

図1は本発明の実施の形態に係る研削液浄化装置の平面図、図2は図1の装置を研削液の流動方向に沿って展開した状態を模式的に示す図、図3は図1のA−A線断面図、図4は案内パイプの要部を示す展開図、図5は吸引ユニットの一部を破断した側面図、図6は吸引ユニットの他の例を示す平面図、図7は図6をB方向から見た矢視図である。   FIG. 1 is a plan view of a grinding liquid purifying apparatus according to an embodiment of the present invention, FIG. 2 is a diagram schematically showing a state in which the apparatus of FIG. 1 is developed along the flow direction of the grinding liquid, and FIG. FIG. 4 is a developed view showing the main part of the guide pipe, FIG. 5 is a side view with a part of the suction unit broken, and FIG. 6 is a plan view showing another example of the suction unit. 7 is an arrow view of FIG. 6 viewed from the B direction.

[研削液浄化装置の全体構造]
図1に示す研削液浄化装置1は、研削加工後の研削液が流入する第1沈殿槽2と、第1沈殿槽2で切り粉が沈殿した後の研削液(1次処理された研削液)を吸引する吸引ユニット5と、この研削液を貯留して、再度の沈殿を行う第2沈殿槽6と、清浄化された研削液(2次処理された研削液)を第1沈殿槽2に戻す配管7b及び吸引ポンプ8bを備えている。
[Whole structure of grinding fluid purifier]
A grinding fluid purification apparatus 1 shown in FIG. 1 includes a first sedimentation tank 2 into which a grinding fluid after grinding flows, and a grinding fluid (primary treated grinding fluid) after chips are precipitated in the first sedimentation tank 2. ), The second settling tank 6 that stores the grinding liquid and performs re-precipitation, and the cleaned grinding liquid (secondarily treated grinding liquid) is fed to the first settling tank 2. A pipe 7b and a suction pump 8b are provided.

研削液浄化装置1を構成する各部の構造を図2〜7も参照して説明する。   The structure of each part which comprises the grinding fluid purification apparatus 1 is demonstrated with reference also to FIGS.

(第1沈殿槽)
第1沈殿槽2は、上面が大気に開放した箱型の容器20と、その内部を複数の領域に仕切る仕切板3a、3b、3c、4a、4b、4c、4dを含み、これらの仕切板により、平面からみて格子状に区画された複数個の沈殿室21、22、…25と貯留室26が形成されている。この第1沈殿槽2においては、矢印S1で示す方向から流入した研削液は、沈殿室21から図1に矢印S2、S3、S4に示す方向に(平面から見て右回りに)流動できるように構成される。そのために、図2に示すように、仕切板3a(図1のa1―a2間を仕切る)、仕切板4a(b1―a2間)、4b(b2―a3間)、3c(b3−a3間)は、いずれも下端面と容器20の底面との間に隙間g1が形成されるような高さを有する。図2ではこれらの隙間g1は同一であるが、仕切板ごとに異なっていてもよい。他の仕切板3b(a2−a3間)、4c(a3−b4間)及び4d(a2−b5間)は、各沈殿室から分離された貯留室26を形成するために、下端面が容器20の底面200に密着するように固定される。
(First sedimentation tank)
The first sedimentation tank 2 includes a box-shaped container 20 whose upper surface is open to the atmosphere, and partition plates 3a, 3b, 3c, 4a, 4b, 4c, and 4d that partition the interior into a plurality of regions. Thus, a plurality of sedimentation chambers 21, 22,... 25 and a storage chamber 26, which are partitioned in a lattice shape when viewed from the plane, are formed. In the first settling tank 2, the grinding fluid flowing in from the direction indicated by the arrow S1 can flow from the settling chamber 21 in the directions indicated by the arrows S2, S3, and S4 in FIG. 1 (clockwise as viewed from the plane). Configured. Therefore, as shown in FIG. 2, the partition plate 3a (partitioning between a1-a2 in FIG. 1), the partition plate 4a (between b1-a2), 4b (between b2-a3), 3c (between b3-a3) Each has a height such that a gap g <b> 1 is formed between the lower end surface and the bottom surface of the container 20. In FIG. 2, these gaps g1 are the same, but may be different for each partition plate. The other partition plates 3b (between a2 and a3), 4c (between a3 and b4), and 4d (between a2 and b5) have a lower end surface of the container 20 to form a storage chamber 26 separated from each sedimentation chamber. It is fixed so as to be in close contact with the bottom surface 200.

下流側の沈殿室25には、上澄み液(液面付近の研削液)及び切り粉が付着した泡状物質を吸引して、第2沈殿槽6に給送するために、案内パイプ50を含む吸引ユニット5が設置されている。この吸引ユニット5は、沈殿室25と第2沈殿槽6を接続する配管7aと吸引ポンプ8aを含む。この浄化装置では、配管7a、7bを含めて研削液を搬送するための各配管を可撓管、例えば樹脂製のフレキシブルチューブを使用することにより、配管作業が容易となる。   The downstream sedimentation chamber 25 includes a guide pipe 50 for sucking the supernatant liquid (grinding liquid near the liquid surface) and the foamy substance with chips adhering thereto and feeding them to the second sedimentation tank 6. A suction unit 5 is installed. The suction unit 5 includes a pipe 7a that connects the sedimentation chamber 25 and the second sedimentation tank 6, and a suction pump 8a. In this purifying apparatus, the piping work is facilitated by using a flexible tube, for example, a flexible tube made of resin, for each piping for conveying the grinding liquid including the pipings 7a and 7b.

(吸引ユニット)
吸引ユニット5は、図4に示すように、案内パイプ50及び、案内パイプ50と容器20の底面の間隔g2(図2参照)を調整可能とする調整機構を有するように構成される。この調整機構は、案内パイプ50の外周面に一端側が固定されたアーム51a、51bと、アームの他端側に固定された調整ナット52a、52bと、両ナットにねじ込まれた調整ボルト53を含む。この吸引ユニット5は、調整ボルト53を回転させて調整ボルト53の長さ(ナット52bから下側に延出する長さ)を所定の寸法に設定した後、容器20の内面に固定されるL字型保持部材54の支持孔55に、調整ボルト53の先端を挿入することにより、沈殿室25に設置することができる。
(Suction unit)
As shown in FIG. 4, the suction unit 5 is configured to have a guide pipe 50 and an adjustment mechanism that can adjust a gap g <b> 2 (see FIG. 2) between the guide pipe 50 and the bottom surface of the container 20. This adjustment mechanism includes arms 51a and 51b having one end fixed to the outer peripheral surface of the guide pipe 50, adjustment nuts 52a and 52b fixed to the other end of the arm, and an adjustment bolt 53 screwed into both nuts. . The suction unit 5 rotates the adjustment bolt 53 to set the length of the adjustment bolt 53 (the length extending downward from the nut 52b) to a predetermined dimension, and then is fixed to the inner surface of the container 20. The tip of the adjustment bolt 53 can be inserted into the support hole 55 of the character-shaped holding member 54 to install it in the sedimentation chamber 25.

(案内パイプ)
案内パイプ50が単純な円筒体で形成される場合、ポンプの運転を開始すると、吸引動作と吐出動作が間歇的に繰り返されるので、沈殿室25の液面が間歇的に変動(上下動)する(吸引運転時には水位が下がり、吐出運転時には、水位が上昇する)。これにより、泡状物質を含む研削液の吸引が円滑に行われない場合がある。そこで、図5(a)に示すように上端縁に複数の略三角形状の切り込み500aを有する案内パイプ50を使用した場合は、切り込みから研削液が流入するので、液面の変動が抑制されて、研削液とともに流動性の小さい泡状物質を吸引し易くなる。切り込みの形状は、図5(a)に限らず、図5(b)に示す半円弧と長方形のスリットの組合わせ、あるいは図5(c)に示す半楕円と楔状スリットの組み合わせなど研削液の種類や流量などに応じて変更することができる。
(Guide pipe)
When the guide pipe 50 is formed of a simple cylindrical body, when the operation of the pump is started, the suction operation and the discharge operation are intermittently repeated, so that the liquid level in the precipitation chamber 25 fluctuates intermittently (up and down movement). (The water level decreases during suction operation, and the water level increases during discharge operation). Thereby, the suction | inhalation of the grinding fluid containing a foam-like substance may not be performed smoothly. Therefore, as shown in FIG. 5A, when the guide pipe 50 having a plurality of substantially triangular cuts 500a at the upper end edge is used, since the grinding fluid flows from the cuts, fluctuations in the liquid level are suppressed. It becomes easy to suck the foamy substance having low fluidity together with the grinding liquid. The shape of the cut is not limited to FIG. 5 (a), but a combination of a semicircular arc and a rectangular slit shown in FIG. 5 (b), or a combination of a semi-ellipse and a wedge-shaped slit shown in FIG. 5 (c). It can be changed according to the type and flow rate.

(フロート式吸引ユニット)
吸引ユニット5は、上記の構造に限らず、図6及び7に示すような液面に応じて案内パイプが上下する構造(フロート式)でもよい。この吸引ユニット5は、案内パイプ50の外周面に複数個(図6では3個)のアーム56a、56b、56cの一端を固定し、各アームの他端に球形状のフロート57a、57b、57cを固定して形成することができる。
(Float type suction unit)
The suction unit 5 is not limited to the above structure, and may have a structure (float type) in which the guide pipe moves up and down according to the liquid level as shown in FIGS. The suction unit 5 has one end of a plurality of (three in FIG. 6) arms 56a, 56b, 56c fixed to the outer peripheral surface of the guide pipe 50, and spherical floats 57a, 57b, 57c on the other end of each arm. Can be fixed.

(第2沈殿槽)
図1と3に示すように、第2沈殿槽6は、第1沈殿槽2から吸引された研削液を貯留する、上面が大気に開放した箱型の容器60を含むとともに、その内部に清浄化された研削液が溜められる領域を形成するために、一辺側に固定された、平面からみてコ字形で底面から所定距離をおいて設けられた仕切り61を有する。仕切り61の内側には、途中に吸引ポンプ8bが設けられた配管7bの一端側が浸漬されている。
(Second settling tank)
As shown in FIGS. 1 and 3, the second settling tank 6 includes a box-shaped container 60 that stores the grinding fluid sucked from the first settling tank 2 and whose upper surface is open to the atmosphere, and cleans the inside thereof. In order to form a region where the converted grinding fluid is stored, the partition 61 is fixed to one side and is U-shaped when viewed from the plane and is provided at a predetermined distance from the bottom surface. Inside the partition 61, one end side of a pipe 7b provided with a suction pump 8b in the middle is immersed.

[浄化プロセス]
研削加工では、砥石の目詰まり、砥石とワークとの溶着、切り粉の付着などを防止するために、研削液(例えば水溶性研削油剤を水で30〜100倍程度に希釈した溶液)が使用され、加工後の研削液には切り粉(平均粒径が例えば10〜50μm程度の異形金属粒子)や砥粒などの異物が混入しているが、上記の研削液浄化装置1に研削液を流入させ、吸引ポンプの運転を開始すると、次の各工程を実行することにより清浄化された研削液が得られるので、この研削液をクーラントタンクに戻して再使用することができる。この浄化プロセスを図2及び3により説明する。
[Purification process]
In grinding, grinding fluid (for example, a solution obtained by diluting water-soluble grinding fluid 30 to 100 times with water) is used to prevent clogging of the grinding stone, welding between the grinding wheel and workpiece, and adhesion of cutting chips. In addition, foreign materials such as chips (an irregular metal particle having an average particle diameter of about 10 to 50 μm) and abrasive grains are mixed in the processed grinding fluid. The grinding fluid is supplied to the grinding fluid purification device 1 described above. When the suction pump is started and the operation of the suction pump is started, a cleaned grinding fluid can be obtained by executing the following steps. The grinding fluid can be returned to the coolant tank and reused. This purification process will be described with reference to FIGS.

(沈殿工程)
沈殿室21に流入した研削液(矢印S1)は、沈殿室22から沈殿室23、24、25と流動する間に、切り粉が沈殿して各沈殿室の底面に堆積する(図2に破線で示すスラッジが形成される)ので、沈殿室25の液面には切り粉が付着した泡状物質が浮遊するとともに、切り粉が沈殿した上澄み液が生成される。
(Precipitation process)
As the grinding fluid (arrow S1) that has flowed into the settling chamber 21 flows from the settling chamber 22 to the settling chambers 23, 24, and 25, swarf settles and accumulates on the bottom surface of each settling chamber (the broken line in FIG. 2). Thus, a foamy substance with attached chips floats on the liquid surface of the sedimentation chamber 25, and a supernatant liquid with generated chips is generated.

上記の第1沈殿槽2において、切り粉の沈降速度(ストークス・アレンの法則で示す式で定まる)を上げるために、研削液の流動速度を下げて、緩やかに(例えば容積が0.8〜1mの場合で15〜25分の時間を掛けて)流動させることにより、比重の小さい切り粉(例えばアルミニウム合金の切り粉)を確実に重力により沈殿させることができる。そのためには、この沈殿槽は複数の沈殿室に区画されていることが必要であり、具体的には3槽以上に区画されていることが好ましい。 In the first settling tank 2 described above, in order to increase the sedimentation rate of the chips (determined by the equation shown by Stokes-Allen's law), the grinding fluid flow rate is decreased and gradually (for example, the volume is 0.8 to By letting it flow for 15 to 25 minutes in the case of 1 m 3 , chips having a small specific gravity (for example, aluminum alloy chips) can be reliably precipitated by gravity. For this purpose, the settling tank needs to be partitioned into a plurality of settling chambers, and specifically, it is preferable that the settling tank is partitioned into three or more tanks.

(上澄み液吸引工程)
ポンプ8aの運転により、液面付近に存在する上澄み液は泡状物質とともに案内パイプ50を底面に向って流動し、パイプの出口から吸引されて第2沈殿槽6に送られる(矢印S5)。第2沈殿槽6では研削液に含まれる切り粉が更に沈殿するので、清浄化された(切り粉をほとんど含まない)研削液が得られる。この清浄化された研削液は第1沈殿室の貯留室26に戻され(矢印S6)、次いでクーラントタンク(不図示)に送られて(矢印S7)再使用される。
(Supernatant liquid suction process)
By the operation of the pump 8a, the supernatant liquid present in the vicinity of the liquid surface flows along the guide pipe 50 together with the foamy substance toward the bottom surface, is sucked from the outlet of the pipe, and sent to the second sedimentation tank 6 (arrow S5). In the second settling tank 6, the chips contained in the grinding liquid are further precipitated, so that a cleaned grinding liquid (containing almost no chips) is obtained. The cleaned grinding fluid is returned to the storage chamber 26 of the first settling chamber (arrow S6), and then sent to a coolant tank (not shown) (arrow S7) for reuse.

上記の浄化装置において、切り粉の材質や研削条件(例えば粗研削あるいは仕上げ研削)などに応じて案内パイプ50と容器20の底面との距離g2を調整して、沈殿室25の研削液の上面に浮遊した泡状物質が吸引されるのを少なくし、第2沈殿槽に供給される切り粉を少なくすることが好ましい。例えばg2が小さすぎると、切り粉が沈降しにくいので、泡状物質が吸引される確率が増大する。   In the above purification device, the distance g2 between the guide pipe 50 and the bottom surface of the container 20 is adjusted according to the material of the chips and the grinding conditions (for example, rough grinding or finish grinding), and the upper surface of the grinding liquid in the precipitation chamber 25. It is preferable to reduce the amount of the foamy substance floating in the vacuum and to reduce the amount of chips supplied to the second settling tank. For example, if g2 is too small, the chips are difficult to settle, so the probability that the foamy substance is sucked increases.

(研削液返送工程)
この清浄化された研削液は、ポンプ8bの運転により、第1沈殿室2の貯留室26に戻されて更に切り粉が沈殿された後、矢印S7で示すように研削液供給経路(不図示)に供給されて、再度研削加工に供される。したがって研削液には切り粉が殆ど含まれないので、スクラッチの発生を大幅に低減することができる。
(Grinding fluid return process)
The cleaned grinding fluid is returned to the storage chamber 26 of the first sedimentation chamber 2 by the operation of the pump 8b and further swarf is settled, and then the grinding fluid supply path (not shown) is indicated by an arrow S7. ) And again subjected to grinding. Therefore, since the cutting fluid is hardly contained in the grinding liquid, the generation of scratches can be greatly reduced.

本実施の形態によれば、複数の沈殿室と吸引手段を組合わせた浄化システムを形成し、フィルターなどの交換部材を全く使用しないので、低コストで、環境負荷が極めて少なく、しかも加工不良(スクラッチ)が大幅に低減された研削加工を実現できるものであり、極めて高い実用性を有する。   According to the present embodiment, a purification system is formed by combining a plurality of sedimentation chambers and suction means, and no replacement member such as a filter is used. Therefore, the cost is low, the environmental load is extremely low, and processing defects ( Grinding with significantly reduced scratches) can be realized and has extremely high practicality.

本発明は上記の実施の形態で説明した構成に限らず、種々の変更が可能であり、例えば、沈殿室の形状、その区画数などはワークの材質や研削条件等に応じて設定すればよい。   The present invention is not limited to the configuration described in the above embodiment, and various modifications are possible. For example, the shape of the sedimentation chamber, the number of compartments, and the like may be set according to the workpiece material, grinding conditions, and the like. .

本発明の実施の形態に係る研削液浄化装置の平面図である。It is a top view of the grinding fluid purification apparatus which concerns on embodiment of this invention. 図1の装置を研削液の流動方向に沿って展開した状態を模式的に示す図である。It is a figure which shows typically the state which expand | deployed the apparatus of FIG. 1 along the flow direction of a grinding fluid. 図1のA−A線断面図である。It is the sectional view on the AA line of FIG. 案内パイプの一部を破断した側面図である。It is the side view which fractured | ruptured a part of guide pipe. 吸引ユニットの要部を示す展開図である。It is an expanded view which shows the principal part of a suction unit. 吸引ユニットの他の例を示す平面図である。It is a top view which shows the other example of a suction unit. 図6をB方向から見た矢視図である。It is the arrow view which looked at FIG. 6 from the B direction.

符号の説明Explanation of symbols

1:研削液浄化装置、2:第1沈殿槽、20:容器、21、22、23、24、25:沈殿室、26:貯留室、3a、3b、3c、4a、4b、4c、4d:仕切板、5:吸引ユニット、50:案内パイプ、500a、500b、500c:切り込み、51a、51b:アーム、52a、52b:ナット、53:調整ボルト、54:支持部材、55:保持孔、6:第2沈殿槽、60:容器、61:仕切り、7a、7b:フレキシブル管、8a、8b:吸引ポンプ、 1: grinding fluid purification device, 2: first sedimentation tank, 20: container, 21, 22, 23, 24, 25: sedimentation chamber, 26: storage chamber, 3a, 3b, 3c, 4a, 4b, 4c, 4d: Partition plate, 5: suction unit, 50: guide pipe, 500a, 500b, 500c: notch, 51a, 51b: arm, 52a, 52b: nut, 53: adjustment bolt, 54: support member, 55: holding hole, 6: Second settling tank, 60: container, 61: partition, 7a, 7b: flexible pipe, 8a, 8b: suction pump,

Claims (5)

切り粉を含む研削液が所定方向に流動する複数の沈殿室と清浄化された研削液を貯留する貯留室を有する第1沈殿槽と、下流側の前記沈殿室の液面付近に存在する研削液を底面側に向って流動させる案内パイプと、前記案内パイプを通って吸引された研削液が収容される第2沈殿槽と、前記第2沈殿槽から前記貯留室に清浄化された研削液を返送する返送手段を有することを特徴とする研削液浄化装置。 A first settling tank having a plurality of settling chambers in which a grinding fluid containing cutting powder flows in a predetermined direction and a storage chamber for storing the cleaned grinding fluid, and grinding existing near the liquid surface of the settling chamber on the downstream side A guide pipe for causing the liquid to flow toward the bottom surface side, a second settling tank in which the grinding liquid sucked through the guide pipe is stored, and a grinding liquid cleaned from the second settling tank to the storage chamber Grinding fluid purifying device, characterized in that it has a return means for returning. 前記案内パイプは、研削液が流入する側の端縁部に複数の切り込みを有することを特徴とする請求項1記載の研削液浄化装置。 2. The grinding fluid purifying apparatus according to claim 1, wherein the guide pipe has a plurality of cuts at an edge portion on a side into which the grinding fluid flows. 前記案内パイプは、前記沈殿室の底面との距離を調整可能な支持部材を介して前記第1沈殿槽に設けられていることを特徴とする請求項2に記載の研削液浄化装置。 The grinding fluid purifier according to claim 2, wherein the guide pipe is provided in the first sedimentation tank via a support member capable of adjusting a distance from a bottom surface of the sedimentation chamber. 前記案内パイプは、前記沈殿室の液面に追従して浮遊するフロート部材を介して前記第1沈殿槽に設置されていることを特徴とする請求項2に記載の研削液浄化装置。 The grinding fluid purifier according to claim 2, wherein the guide pipe is installed in the first sedimentation tank via a float member that floats following the liquid level in the sedimentation chamber. 切り粉を含む研削液を複数の沈殿室を有する第1沈殿槽内で所定方向に流動させながら切り粉を沈殿させる沈殿工程と、下流側の前記沈殿室の液面付近に存在する上澄み液を底面側に流動させてから吸引して第2沈殿槽に給送する吸引工程と、第2沈殿槽で切り粉を沈殿させた後の上澄み液を回収して前記第1沈殿槽の前記沈殿室から分離された領域に返送する返送工程を含むことを特徴とする研削液浄化方法。 A precipitation step of precipitating the chips while flowing the grinding fluid containing the chips in a predetermined direction in a first settling tank having a plurality of settling chambers, and a supernatant present in the vicinity of the liquid surface of the settling chamber on the downstream side A suction step of sucking and feeding to the second settling tank after flowing to the bottom side, and collecting the supernatant liquid after settling chips in the second settling tank and collecting the settling chamber of the first settling tank A grinding liquid purification method comprising a returning step of returning to a region separated from the grinding fluid.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013163249A (en) * 2012-02-13 2013-08-22 Thk Co Ltd Coolant cleaning device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5257569A (en) * 1975-11-05 1977-05-12 Toyoda Mach Works Ltd Grinding liquid tank
JPH01122807U (en) * 1988-02-04 1989-08-21
JPH077713U (en) * 1993-06-30 1995-02-03 フジオーゼックス株式会社 Purification device for grinding fluid
JPH0724556U (en) * 1993-10-14 1995-05-09 フジオーゼックス株式会社 Purification device for grinding fluid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5257569A (en) * 1975-11-05 1977-05-12 Toyoda Mach Works Ltd Grinding liquid tank
JPH01122807U (en) * 1988-02-04 1989-08-21
JPH077713U (en) * 1993-06-30 1995-02-03 フジオーゼックス株式会社 Purification device for grinding fluid
JPH0724556U (en) * 1993-10-14 1995-05-09 フジオーゼックス株式会社 Purification device for grinding fluid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013163249A (en) * 2012-02-13 2013-08-22 Thk Co Ltd Coolant cleaning device

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