JPH0448921Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention]

(Field of Industrial Application) This invention relates to a lapping device, and more particularly to a lapping device used for lapping a workpiece made of a porous material. (Prior Art) Conventionally, when lapping the polished surface of a workpiece made of a porous material, for example, as shown in FIG. 3, lapping is performed on the inner surface 102 of a cylindrical workpiece 101. When wrapping, the workpiece 101 is fitted into a cylindrical wrap tool 104 connected to a drive source (not shown) via a rod 103, and the wrap tool 104 and the inner surface 10 of the workpiece 101 are connected to each other.
While rotating the lapping tool 104 with an appropriate amount of abrasive grains and lapping oil interposed between the lapping tool 104 and the lapping tool 104,
This was done by sliding the workpiece 101 in the axial direction. (Problem to be solved by the invention) However, when lapping is performed on the workpiece 101 made of a porous material in the manner described above, the porous portion 105 of the workpiece 101 is
Since the abrasive grains get into the lapping process, it is necessary to carry out cleaning several times to remove the abrasive grains after the lapping process is completed, resulting in a problem in that the number of man-hours increases accordingly. Furthermore, if an attempt is made to shorten the machining time by using abrasive grains that are slightly larger than the respective hole diameters of the porous portions 105, these abrasive grains may get stuck in the porous portions 105 and cannot be removed even by the above-mentioned cleaning. Therefore, there was a problem in that it was not easy to select the most suitable abrasive grains that would not fit into the porous portions 105 and could shorten the machining time. (Purpose of the invention) This invention was made by focusing on the above-mentioned problems, and when lap processing is performed on a workpiece made of porous material, the porous part of the workpiece is polished during the lapping process. By minimizing the intrusion of particles and reducing the number of times of cleaning to remove abrasive particles after finishing the lapping process, it is possible to reduce the number of man-hours, and to prevent the abrasive particles from entering the porous areas. By eliminating the fear of clogging and allowing the use of abrasive grains of any size, it is easy to select the most suitable abrasive grains for lapping, and the processing time can be shortened. The purpose is to provide equipment.

[Structure of the idea]

(Means for Solving the Problems) The lapping device according to this invention has a fluid chamber between a lapping tool that performs lapping on the polished surface of a workpiece made of a porous material and a non-polished surface of the workpiece. The present invention is characterized by comprising a fluid chamber forming means for forming a fluid chamber and causing the compressed fluid supplied into the fluid chamber to flow out to the polishing surface side through the porous portion of the workpiece. In this case, the workpiece made of porous material is copper,
Examples include those obtained by sintering metal powders such as iron, aluminum, and alloys thereof. Such porous materials not only have the mechanical properties and workability of metals, but also have functions such as storing substances in the pores, filtering, and restricting valve functions based on their porous nature. Due to these characteristics, it is used in parts such as bearings, filters, and throttle valves. (Example 1) This invention will be explained below based on the drawings. FIG. 1 shows a lapping device according to a first embodiment of this invention, and this embodiment shows an example of a lapping device that performs lapping on the inner surface of a cylindrical workpiece made of porous material. I will list and explain. That is, this lapping device 1 includes a driving source (not shown), a cylindrical lapping tool 3 attached to the driving source via a rod 2, and an outer surface (non-polishing) of a workpiece 10 made of a cylindrical porous material. side) 10
air chamber forming means (fluid chamber forming means) for forming an air chamber (fluid chamber) 4 between the air chamber and the air chamber 4 as described later. The air chamber forming means is mainly composed of a case 5 and a case cover 6. The case 5 has a substantially cylindrical shape with a bottom 5a, and the workpiece 10 can be fitted into the case without any gap. In addition, the case 5 has a wrap insertion hole 5b whose diameter is slightly larger than the inner diameter of the workpiece 10 and the outer diameter of the wrap tool 3 at the center of the bottom 5a, and at the outside of the open end 5c on the opposite side. It is provided with a flange 5d. Further, an annular recess 5f is formed on the inner surface 5e of the case 5 at approximately the center thereof. On the other hand, the case cover 6 is attached and fixed to the flange 5d of the case 5 with bolts 7 and nuts 8, and a lap relief hole 6a having approximately the same diameter as the lap insertion hole 5b is provided in the center of the case cover 6. is formed. Then, the air chamber forming means fits the workpiece 10 inside the case 5, and the flange 5 of the case 5
By attaching and fixing the case cover 6 to d, the work 10 is held, and at the same time, an air chamber 4 is formed between the annular recess 5f and the outer surface 10a of the work 10. ing. In this case, the annular recess 5f has an air chamber 4.
An air supply hole 5g is formed to communicate between the air supply hole 5g and the outside, and a flexible tube whose one end is connected to an air compressor (not shown) is connected to a boss portion 5h formed on the outer surface side of the case 5 of the air supply hole 5g. 9
By connecting the other end 9a, compressed air (compressed fluid) can be supplied into the air chamber 4. The air chamber forming means also includes a seal ring 11 located around the lap insertion hole 5b in the bottom 5a of the case 5 that contacts one end 10b of the work 10 when the work 10 is held.
In addition, a seal ring 11b is provided around the wrap escape hole 6a in the case cover 6 that comes into contact with the other end surface 10c, and a seal ring 11b is provided around the opening at the open end 5c of the case 5 that comes into contact with the case cover 6. Seal ring 11c on the part
are provided, and these seal rings 11a to 1
1c, each abutting portion is brought into close contact with each other. Therefore, most of the compressed air supplied into the air chamber 4 is directed to the workpiece 10 as shown by the imaginary line.
It flows out from the inner surface (polishing surface) 10d of the workpiece 10 through the porous portion 10c, and further flows out through the lap insertion hole 5b and the lap escape hole 6a. Therefore, the lapping procedure for the inner surface 10d of the workpiece 10 by the above-mentioned lapping apparatus 1 will be explained. First, the workpiece 10 is installed inside the case 5,
Case cover 6 is brought into contact with flange 5d of case 5 and fixed with bolts 7 and nuts 8. Next, flexible tube 9, air supply hole 5g
Through this, compressed air from an air compressor (not shown) is supplied into the air chamber 4 formed between the annular recess 5f of the case 5 and the outer surface 10a of the workpiece 10.
At this time, the case 5 and case cover 6 have
Seal rings 11a to 11c as described above.
is provided, most of the compressed air goes to the workpiece 10.
It passes through the porous portion 10c and flows out from the inner surface 10d. Subsequently, the lapping tool 3 is inserted into the workpiece 10 through the lapping insertion hole 5b of the case 5, and the lapping tool 3 is inserted into the workpiece 10 with abrasive grains and lapping oil interposed between the inner surface 10d of the workpiece 10 and the lapping tool 3. At the same time, the workpiece 10 is slid in the axial direction of the lap tool 3, and the inner surface 1 of the workpiece 10 is rotated.
Perform wrap processing on 0d. As explained above, according to the wrapping apparatus 1 according to this embodiment, compressed air is constantly flowing through the porous portion 10c of the workpiece 10, so that
Since it is possible to prevent abrasive grains from entering the porous portion 10c of the workpiece 10 as much as possible, it is possible to reduce the number of times of cleaning to remove abrasive grains after finishing machining, and it is also possible to use abrasive grains of any size. Moreover, during lapping, the lapping tool 3 can be always positioned at the center of the work 10 by the compressed air flowing out from the inner surface 10d of the work 10. It is possible to prevent uneven contact with the inner surface 10d of the work 10 in No. 3, and the inner surface 10 of the work 10 can be prevented from occurring.
A feature of this method is that it is possible to perform lap processing with higher precision on d. (Embodiment 2) Figure 2 shows a lapping device according to a second embodiment of this invention. In this embodiment, the lapping device performs lapping on a flat surface of a workpiece made of porous material. exemplify. This lapping device 21 includes a driving source (not shown), a lapping surface plate (lap tool) 23 that is moved in the horizontal direction by the output of the driving source, and
Workpiece 3 made of porous material with flat surfaces on the top and bottom
air chamber forming means (fluid chamber forming means) for forming an air chamber (fluid chamber) 24 between the upper surface (non-polishing surface) 30a of The air chamber forming means is mainly composed of a case 25 and a case cover 26. The case 25 includes a flange receiver 25a that engages a flange portion 30b formed on the upper surface 30a side of the workpiece 30 without a gap, and a lower surface (polished surface) 3 of the workpiece 30.
The case 25 is provided with a through hole 25b into which the protrusion 30d formed on the 0c side fits with a sufficient margin, and a flange 25c for attaching a case cover is provided on the upper end side of the case 25. When the flange portion 30b of the workpiece 30 is engaged with the flange receiver 25a, the upper surface 30a of the workpiece 30
The lower surface 30c of the workpiece 30 is flush with the upper surface and slightly protrudes downward from the through hole 25b. On the other hand, the case cover 26 is fixed to the flange 25c of the case 25 with bolts 7 and nuts 8, and the lower surface 26a of the case cover 26 on the center side
A recess 26b is formed therein. Then, the air chamber forming means attaches the workpiece 30 to the case 25 and attaches the case cover 26 to the flange 2.
5c, the work 30 is held and at the same time an air chamber 24 is formed between the recess 26b of the case cover 26 and the upper surface 30a of the work 30. In this case, case cover 2
An air supply hole 26c that communicates the outside with the air chamber 24 is formed in the concave portion 26b of No. 6, and a boss portion 26d formed on the upper surface side of the case cover 26 of the air supply hole 26c is connected to an air conditioner (not shown). Compressed air can be supplied into the air chamber 24 by connecting the other end 9a of the flexible tube 9, which has one end connected to the presser. Further, the air chamber forming means includes the upper surface 3 of the workpiece 30.
A seal ring 1 is placed around the recess 26b on the lower surface 26a of the case cover 26 that contacts the case cover 0a.
1, the abutting portions are brought into close contact with each other. Therefore, in this embodiment, as in the first embodiment, most of the compressed air supplied into the air chamber 24 passes through the porous portion 30e of the workpiece 30 and reaches the lower surface of the workpiece 30, as shown by the imaginary line. It flows out from the 30c side. In the lapping procedure of the lapping device 21 described above, the work 30 is held by the case 25 and the case cover 26, and the recess 26 of the case cover 26 is
Compressed air from an air compressor is supplied into the air chamber 24 formed between the upper surface 30a of the workpiece 30 and the upper surface 30a of the workpiece 30, and abrasive grains and lapping oil are supplied between the lower surface 30c of the workpiece 30 and the lapping surface plate 23. By interposing the lap surface plate 23 and the workpiece 30 to slide against each other, the lower surface 30c of the workpiece 30 is lapped. In this second embodiment as well, since compressed air is constantly flowing through the porous portion 30e of the workpiece 30, it is possible to suppress abrasive grains from entering the porous portion 30e as much as possible. It is possible to reduce the number of cleaning times required for cleaning, and it is also possible to use abrasive grains of any size, making it possible to shorten processing time. (Evaluation Example) Next, regarding the workpieces 10 and 30 that have been lapped by the lapping devices 1 and 21 according to the first and second embodiments described above, the porous portions 10c and 30
When cleaning was attempted by injecting alcohol into the hole e and letting the alcohol flow out using compressed air, the abrasive grains flowing out from the porous portions 10c and 30e were no longer visible after one or two cleanings. . Also, for comparison, the above-mentioned lapping machines 1 and 2 are shown below.
When we attempted to clean the workpieces 10 and 30 that had been lapped without passing compressed air in step 1 using the above method, we found that even after 7 to 8 times of cleaning, abrasive particles flowed out from the porous portions 10c and 30e. It was observed. From the above evaluation results, it has been demonstrated that the lapping devices 1 and 21 according to this invention have the effect of significantly reducing the amount of abrasive grains that enter the porous portions 10c and 30e of the workpieces 10 and 30. Ta. In the lap processing apparatuses 1 and 21 according to the first and second embodiments described above, each air chamber forming means is configured to also have the function of holding the workpieces 10 and 30, but the air chamber forming means is not necessarily provided. However, the configuration is not limited to this. Further, in the first and second embodiments, compressed air was used as the compressed fluid, but the invention is not limited to this. For example, an inert gas such as nitrogen gas may be used as a compressed fluid other than compressed air. May be used.

[Effect of the idea]

As explained above, according to the lapping device of this invention, a fluid chamber is formed between the lapping tool that performs lapping on the polished surface of a workpiece made of a porous chamber material and the non-polished surface of the workpiece. and fluid chamber forming means for forming a compressed fluid supplied into the fluid chamber and flowing out to the polishing surface side through the porous portion of the workpiece, so that abrasive grains enter the porous portion of the workpiece during machining. This makes it possible to minimize the number of times of cleaning to remove abrasive grains after finishing machining, and as a result,
In addition to reducing man-hours, it is also possible to use abrasive grains of any size, making it easy to select the most suitable abrasive grains for lapping, and also shortening machining time. It is possible to bring about a positive effect.

[Brief explanation of the drawing]

FIG. 1 shows a lapping apparatus according to a first embodiment of this invention, and is a longitudinal cross-sectional view of the lapping apparatus equipped with an air chamber forming means when lapping is performed on the polished surface of a workpiece made of a porous material. Fig. 2 shows a lapping device according to a second embodiment of this invention, and is a longitudinal cross-section of the lapping device equipped with an air chamber forming means when performing lapping on the polished surface of a workpiece made of a porous material. FIG. 3 is an explanatory longitudinal cross-sectional view showing the lapping procedure when performing lapping on the polished surface of a workpiece made of a conventional porous material. 1, 21... Wrap processing device, 3... Wrap tool, 4, 24... Air chamber (fluid chamber), 5, 25...
...Case (fluid chamber forming means), 6, 26... Case cover (fluid chamber forming means), 10, 30... Work (work made of porous material), 10a...
Outer surface of workpiece (non-polished surface of workpiece), 10c, 3
0e...Porous part of the workpiece, 10d...Inner surface of the workpiece (polished surface of the workpiece), 23...Lap surface plate (lap tool), 30a...Top surface of the workpiece (non-polished surface of the workpiece), 30c...Workpiece The bottom surface (polished surface of the workpiece).

Claims (1)

[Scope of utility model registration request] A fluid chamber is formed between a lapping tool that performs lapping on the polished surface of a workpiece made of a porous material and a non-polished surface of the workpiece, and compressed fluid supplied into the fluid chamber is passed through the porous portion of the workpiece. A lapping device characterized by comprising means for forming a fluid chamber for causing fluid to flow out to the polishing surface side.