JP2002126792A - Solidified substance of grinding sludge and solidifying method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solidified substance, and a solidifying method therefor, capable of being solidified without generating a problem of flowing from a slide gap of a cylinder and a piston while containing a fine grinding sludge. SOLUTION: The solidified substance B of this grinding sludge is a solidified substance obtained by solidifying a coolant-containing grinding sludge generated at a grinding line of the quenching part to a cylindrical shape by a pressing. An axial center part is made to be a fine sludge part Ba comprising a grinding sludge having a fine grain size and both side parts are made to be a rough sludge part Bb comprising a grinding sludge having a rough grain size. The pressing is carried out by placing the fine grinding sludge Sa at a center of a cylinder 40 and the rough grinding sludge Sb at both sides thereof and pressurizing them with pistons 41, 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for solidifying grinding sludge generated in a grinding line for hardened parts, for example, iron-based components such as inner and outer rings of rolling bearings and rolling elements, and grinding sludge of other steel materials for bearings. The present invention relates to a solidified grinding sludge and a method for solidifying the same.

[0002]

2. Description of the Related Art After hardening, iron-based components such as inner and outer races and rolling elements of a rolling bearing are subjected to grinding on a rolling surface and the like. The powdery grinding waste generated by the grinding is discharged as sludge together with the coolant outside the machine, and after filtration, the coolant is reused for grinding. Grinding sludge remaining by filtration is landfilled as sludge. FIG. 5 is a block diagram showing the flow of the processing. Grinding machine 101
The grinding waste generated in the above is transported together with the coolant through a pipe, filtered by a filtering means 102 such as a filter or a sedimentation facility, and the purified coolant is supplied to a coolant tank 103 for supply to the grinding machine 101 by a filter and a pump. Back through. Since the grinding sludge remaining after filtration contains a large amount of coolant, it cannot be reused, and a disposal company of industrial waste performs disposal processing such as landfill. The amount of grinding waste generated by grinding is small compared to cutting, etc., but in mass production lines such as bearings, the amount generated is large, and landfilling of grinding sludge is not only unfavorable from the environmental point of view, but also It is clear that landfills will no longer be possible due to dead ends in the treatment plant.

For this reason, it has been studied to solidify the grinding sludge by squeezing it, reuse the squeezed coolant, and reuse the solidified material as a steelmaking material. This solidified product is called briquette or the like. Grinding sludge using an aqueous coolant can be easily solidified, and solidifying machines have already been sold. However, oil-based coolant has a higher viscosity than aqueous coolant, and grinding sludge using oil-based coolant has various problems in solidification. For example, when squeezed, the oil-based coolant is difficult to discharge, and cannot be solidified to a required strength simply by increasing the pressure during squeezing. Therefore, solidification of grinding sludge containing oil-based coolant has not yet been put to practical use.

In a grinding line for polishing and removing surface flaws of a metal strip in the process of producing a rolled steel strip, grinding sludge is filtered and collected as a solidified material which has been solidified by pressing. It has been proposed to use it again. In the grinding sludge generated by grinding the rolled steel strip, grinding chips in the grinding sludge are relatively soft and easily solidified. In addition, this grinding sludge has a low proportion of coolant, which also facilitates solidification. However, in the case of hardened part grinding sludge, grinding debris is hard and hard to harden. Therefore, it is necessary to squeeze strongly, but in the grinding sludge of oil-based coolant as described above,
Since it is difficult to discharge the coolant during squeezing, it is more difficult to solidify the coolant. Also, in the case of grinding sludge for hardened parts,
For example, for grinding 1 to 2 g of steel, several liters of coolant /
Since min is used, the ratio of coolant in the grinding sludge is large, and solidification is difficult because most of the coolant is coolant.

In order to solve such a problem, the present applicant has proposed a method of adding a process of filtering and concentrating grinding sludge, and pressing the concentrated sludge in a cylinder to solidify it in a cylindrical shape. (Japanese Patent Application 2000
-129311). As a result, even with the grinding sludge of the oil-based coolant, it was possible to obtain a strong solidified material that did not collapse during handling.

[0006]

However, finely ground grinding sludge tends to flow out of a sliding gap between a cylinder and a piston, and it is difficult to solidify the sludge as it is. There is a problem that it is necessary to make it. In addition, since fine sludge that has entered the sliding gap between the cylinder and the piston hinders the sliding of the piston, there is a problem in that maintenance work such as cleaning takes time and effort. When the quenched part is a steel ball of a bearing or when it is a raceway ring and super-finishing of a rolling surface is performed, such fine grinding sludge is generated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a solidified grinding sludge which contains fine grinding sludge and can be solidified without causing a problem of leakage from a sliding gap between a cylinder and a piston. is there. Another object of the present invention is to provide a method of solidifying grinding sludge that can be solidified without causing a problem of leakage from a sliding gap between a cylinder and a piston while containing fine grinding sludge. is there.

[0008]

The solidified grinding sludge of the present invention is a solidified product obtained by solidifying a coolant-containing grinding sludge generated in a grinding line of a quenched part into a cylindrical shape by pressing, wherein Is characterized in that the central part is composed of fine-grained grinding sludge, and both side parts are composed of coarse-grained grinding sludge. In this way, by making the solidified material of the sandwich structure sandwiching the fine grinding sludge on both sides with the coarse grinding sludge, during solidification,
When the piston is squeezed from both sides in the cylinder, the fine grinding sludge does not hit the piston with the coarse grinding sludge interposed therebetween, and only the rough grinding sludge hits the piston. Therefore, the fine grinding sludge does not enter the sliding gap between the cylinder and the piston, and solidification can be performed without leakage of the fine grinding sludge from the sliding gap. Further, it is possible to prevent the fine grinding sludge from entering the sliding gap and hindering the sliding of the piston.

[0009] The coolant in the solidified product may be oily, and the amount thereof may be 5 to 15 wt.
In the present invention, the coolant in the solidified product may be oily or aqueous, but if it is oily, the above solidification is difficult, and it is necessary to apply strong pressure. The sandwich structure sandwiched between the coarse grinding sludges has a great effect of preventing the fine grinding sludge from flowing into the sliding gap. When the solidified material is reused as a steelmaking material, it is preferable that the amount of coolant as an impurity is small.
If it is less than%, it is difficult to squeeze, and the efficiency of squeezing becomes poor. If the amount of the coolant exceeds 15% by weight, it is difficult to reuse it as a steel material, and the strength tends to be insufficient.

[0010] The quenched component that generates the grinding sludge used for the solidified material may be an iron-based component of a rolling bearing. The iron-based components include, for example, an inner ring, an outer ring,
Or rolling elements. In the process of grinding the components of a rolling bearing, oil-based coolant is often used, and grinding sludge is hard and fine, and grinding sludge that is difficult to solidify is generated. However, the grinding waste is grinding waste such as high-quality bearing steel and is generally mass-produced, so that it becomes grinding sludge having a constant component. Therefore, when it is solidified, a high-quality solidified material is obtained as a steelmaking material. Also,
The conditions for pressing for solidification are also easy to set, and solidification can be performed stably by setting appropriate conditions.

[0011] The method of solidifying grinding sludge of the present invention comprises:
A method of squeezing coolant-containing grinding sludge generated in a grinding line of a quenched part by a piston from both sides in a cylinder into a solidified material, and as the grinding sludge, a fine-grained grinding sludge and a coarse grinding sludge are used. The method is characterized in that fine grinding sludge is squeezed in a state where coarse grinding sludge is put on both sides of the fine grinding sludge in the middle of the cylinder in the axial direction. In this way, by squeezing the fine grinding sludge in the middle of the cylinder with pistons from both sides in a state where coarse grinding sludge is put on both sides, the grinding sludge of the part in contact with the piston becomes only coarse grinding sludge. . Therefore, fine grinding sludge does not flow out into the sliding gap between the cylinder and the piston, and solidification can be performed without causing leakage of the fine grinding sludge from the sliding gap. Further, it is possible to prevent the fine grinding sludge from entering the sliding gap and hindering the sliding of the piston. Regarding the supply path of the grinding sludge into the cylinder, for example, a grinding line where fine grinding sludge is generated, and a grinding line where coarse grinding sludge is generated,
Grinding sludge is collected, and paths for performing filtration, concentration, etc. are separately provided, and grinding sludge obtained in both paths is supplied to a cylinder.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a solidified product of the grinding sludge. The solidified product B of the grinding sludge is a solidified product obtained by solidifying a coolant-containing grinding sludge generated in a grinding line of a quenched part into a cylindrical shape by pressing, and the central portion in the axial direction is a fine sludge portion B.
and a sandwich structure in which both sides are rough sludge portions Bb. The fine sludge portion Ba is a solidified portion of fine-grained grinding sludge, and the coarse sludge portion Bb is a portion composed of coarse-grained grinding sludge. These fine sludge portions Ba and coarse sludge portions Bb on both sides are
At the same time, it is pressed and solidified.

As the grinding sludge of the fine sludge portion Ba, for example, one having a particle size of about 1000 to 2000 mesh is used. As the grinding sludge having such a particle size, for example, in the construction process of a rolling bearing, grinding sludge generated in a steel ball super-finishing processing line or a grinding line for a raceway rolling surface can be used. As the grinding sludge of the coarse sludge portion Bb, one having a particle size of about 100 mesh, for example, 50 to 300 mesh is used. As such grinding sludge, in a bearing manufacturing process, grinding sludge generated in a grinding line of a bearing ring can be used.

The component of the solidified material B is a steel material in which the fine sludge portion Ba and the coarse sludge portion Bb are mostly made of grinding chips, and the amount of the coolant is 5 to 15 wt%. Contains a very small amount of abrasive particles remaining after most of the material has been discharged. The coolant is
A paraffinic coolant of oiliness may be used. The grinding debris has a curled short linear shape and is entangled with each other in the solidified material Ba. The quenched component for obtaining grinding waste is preferably a steel component for a bearing, for example, an iron-based component of a rolling bearing. Specifically, the quenched component is an inner ring, an outer ring, or a rolling element of a rolling bearing, and is preferably made of bearing steel. As bearing steel materials, high-hardened chromium steel (such as SUJ2), medium carbon steel (S
53C), induction hardened steel, case hardened steel (SCR415
Etc.). In addition, no binder (cutting chips, etc.) for solidifying the grinding waste is mixed into the solidified material B at all. The solidified material Ba has a predetermined strength, for example, a strength that does not result in three or more fragments even when dropped from a height of 1 m. The solidified material B having such a strength can be realized by adopting a manufacturing method as described below.

FIG. 2 shows a method of solidifying the solidified material B of the grinding sludge, and shows a solidification step by pressing.
The press 5 includes a cylinder 40 and pistons 41 and 42 on both sides that advance and retreat in the cylinder 40. The pistons 41 and 42 are driven forward and backward by a pressure drive source (not shown) by a hydraulic cylinder or an electric motor. The inside of the cylinder 40 is a compression chamber 40a, and has a sludge inlet 43 that opens to the compression chamber 40a.

At the time of squeezing, coarse grinding sludge Sb, fine grinding sludge Sa, and coarse grinding sludge Sb are sequentially charged into the cylinder 5 from the sludge inlet 43 as shown in FIG. Fine grinding sludge Sa is provided in the middle of the axial direction, and coarse grinding sludge S is provided on both sides.
b is set. These grinding sludges Sa, Sb
Are preferably filtered and concentrated, and are preferably pre-squeezed, as shown later in the process.

As described above, with the grinding sludge Sa, Sb put in the cylinder 5, the pistons 41, 4 are placed from both sides.
Press 2 and squeeze. The coolant squeezed out of the grinding sludges Sa and Sb by this squeezing is applied to the cylinder 4
The fluid is discharged from the cylinder through the sliding gap between the piston 0 and the pistons 41 and 42. By such pressing, the grinding sludge S
a and Sb are solidified to form a solid B. Fine grinding sludge Sa is fine sludge portion Ba in solidified material B.
And the rough grinding sludge Sb becomes the rough sludge portion Bb. In the pressing process, both pistons 41,
Only one of the movements of 42 may be fixed, and the other may be fixed in position. The solidified material B thus solidified
Is pushed out from either end of the cylinder 40 by the movement of the pistons 41 and 42.

According to this fixing method, fine grinding sludge Sa is inserted in the middle of the cylinder 40, and crushing is performed with coarse grinding sludge Sb inserted on both sides thereof. Sludge is
Only coarse grinding sludge Sb is obtained. Therefore, the fine grinding sludge does not flow into the sliding gap between the cylinder 40 and the pistons 41 and 42, and solidification can be performed without the fine grinding sludge Sa leaking from the sliding gap. Further, the fine grinding sludge Sa enters the sliding gap and the pistons 41, 4
2 is prevented from being hindered, and the maintenance work is not troublesome.

Next, the entire process of producing the solidified product will be described. 3 and 4 are a block diagram and a schematic diagram, respectively, showing a method for producing the solidified product B. The grinding lines 1A and 1B are lines for performing grinding using a coolant supplied from a coolant tank 3 by a grinding machine 2, and are divided into two types. One type of grinding line 1A is a line that generates fine grinding sludge, and the other type of grinding line 1B is a line that generates coarse grinding sludge. These two types of grinding lines 1
For each of A and 1B, pre-processing equipment 20A and 20B for performing pre-processing until the grinding sludge is introduced into the press machine 5 are separately provided. Note that each of the grinding lines 1A and 1B handled by each of the pretreatment facilities 20A and 20B may be a plurality of grinding lines, respectively, and in FIG.

In each of the pretreatment facilities 20A and 20B, grinding sludge made up of grinding chips and coolant generated in the grinding machine 2 is filtered by a filtering means 4, and the concentrated sludge generated by the filtration is pressed by a press machine as a solidifying means. In step 5, the mixture is solidified by squeezing to obtain solidified product B. The press 5 has been described with reference to FIG. The filtration device 4 and the press 5 constitute a solidifying device 6. When the grinding lines 1A and 1B are the same type of coolant, the coolant generated by the filtration by the filtration means 4 and the coolant generated by the pressing by the press machine 5 are collected by the collecting paths 7 and 8, respectively. Return to tank 3. From the recovery paths 7 and 8, the coolant tank 3 is provided via a filter and a pump.
The coolant is returned to. The coolant is supplied from the coolant tank 3 to the grinding machine 2 via a filter and a pump.

The solidified product B thus solidified is transported to a steel maker 9 and used by the steel maker 9 as a steel material. The transport of the solidified material B is carried out in a plurality of transport containers 10 called flexible container bags or the like as shown in FIG. In the steelmaking maker 9, the solidified material B is used as a steelmaking material in the arc furnace 11 or the like. The manufactured steel material is used as a material of an object to be ground.

The workpiece to be ground in the grinding lines 1A and 1B is a hardened part, such as bearing steel such as bearing steel. Oil-based coolant is used. The grinding sludge generated in the grinding machine 2 is a fluid having a coolant amount of 90 wt% or more, and the rest is powdery grinding dust and a small amount of grinding grains. In the state of the concentrated sludge filtered by the filtering means 4, this grinding sludge contains almost half of the coolant. The components of the concentrated sludge are, for example, approximately 50% by weight of grinding chips made of bearing steel and the like, and approximately 50% by weight of coolant.
% And a small amount of abrasive grains.

As shown in FIG. 4, the filtering means 4 includes a settling facility 15 and a filter facility 16. Grinding line 1
The grinding sludge generated in A, 1B is first set in the sedimentation facility 15.
The grinding sludge settled here is supplied to a pump 17
To the filter equipment 16 for filtration again. This results in concentrated sludge. As the filter equipment 16, a pressurized belt filter that uses a filter belt 18 and performs pressurized filtration with grinding sludge using compressed air is used. The concentrated sludge may be directly charged into the press 5, but in this example, the concentrated sludge is pre-pressed by the pre-squeezing device 31 and then charged into the press 5. The pre-squeezing device 31 may be one that accommodates a certain amount of concentrated sludge and pre-presses it, or may be one that squeezes with a roll while feeding the concentrated sludge.

In the grinding sludge feeding section of the press machine 5, hoppers 21A and 21B for separately storing grinding sludge supplied from the respective pretreatment facilities 20A and 20B are provided. Via the hoppers 21A and 21B, the fine grinding sludge supplied from the first pretreatment facility 20A and the coarse grinding sludge supplied from the second pretreatment facility 20B are fed into the same grinding sludge of the press machine 5. Mouth 21A, 2
1B can be arbitrarily switched to be input. The collection route 8 for collecting the coolant from the press machine 5 to the coolant tank 3 interposes a settling facility 15A to collect the filtered coolant. Instead of the settling equipment 15A, a filtering means for filtering by another method may be provided.

In this manner, the grinding sludge of the grinding line 1A for generating fine grinding sludge and the grinding sludge of the grinding line 1B for generating coarse grinding sludge are separately pre-treated and put into the same press machine 5. You.

[0026]

The solidified product of the grinding sludge of the present invention is:
Cooling-containing grinding sludge generated in the grinding line of quenched parts is a solidified product that has been solidified into a cylindrical shape by pressing, and the central part in the axial direction is composed of fine grinding sludge, and both sides are composed of coarse grinding sludge. It can be solidified while containing fine grinding sludge without causing a problem of outflow from the sliding gap between the cylinder and the piston. The solidification method of the grinding sludge of the present invention is a method of solidifying the grinding sludge containing coolant generated in the grinding line of the quenched part, by squeezing with a piston from both sides in a cylinder and solidifying the solidified material. As the grinding sludge, using a fine grinding sludge and coarse grinding sludge of a fine grain, the fine grinding sludge in the middle of the cylinder in the axial direction, because it is a method of squeezing with coarse grinding sludge put on both sides thereof,
While containing fine grinding sludge, it can be solidified without causing the problem of outflow from the sliding gap between the cylinder and the piston.There is no problem of clogging of the sliding gap due to grinding sludge, and maintenance is also troublesome. Simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a solidified product according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing each operation state of a press machine for performing the fixing.

FIG. 3A is a block diagram showing a process of producing the solidified product, and FIG. 3B is an explanatory diagram showing an example of its use.

FIG. 4 is a schematic explanatory view of each device in the process of producing the solidified product.

FIG. 5 is a block diagram showing a conventional method for treating grinding sludge.

[Explanation of symbols]

 1A, 1B ... grinding line 4 ... filtration means 5 ... press machine 6 ... solidification device 15 ... sedimentation equipment 16 ... filtration equipment 20A, 20B ... pretreatment equipment 31 ... pre-squeezing equipment 40 ... cylinder 41, 42 ... piston B ... solid Compound Ba: Fine sludge part Bb: Coarse sludge part

Claims (4)

[Claims] 1. A solidified product obtained by solidifying a coolant-containing grinding sludge generated in a grinding line of a quenched part into a cylindrical shape by pressing, wherein a central portion in the axial direction is formed of finely-ground grinding sludge, and both side portions are formed. Is a solidified grinding sludge characterized by comprising a coarse grained grinding sludge. 2. The solidified grinding sludge according to claim 1, wherein the coolant in the fixed material is oily and the amount thereof is 5 to 15 wt. 3. The solidified grinding sludge according to claim 1, wherein the quenched component is an iron-based component of a rolling bearing. 4. A method for solidifying grinding sludge containing coolant generated in a grinding line of a quenched part, which is squeezed by a piston from both sides in a cylinder into a solidified material. Using fine grinding sludge and coarse grinding sludge, fine grinding sludge in the middle of the cylinder in the axial direction, squeezing in a state where coarse grinding sludge is put on both sides thereof, solidification method of grinding sludge .