JP2671558B2 - High silicon aluminum bore surface processing and treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a boring surface of a cylinder block (high silicon aluminum cylinder block) made of an aluminum alloy having a high silicon content, a honing process, and a surface for protruding silicon. The present invention relates to a processing and a processing method suitable for use when performing processing.

(Prior art) In recent years, in order to prevent the wear of the cylinder bore surface without providing a cast iron sleeve, the bore surface of the high silicon aluminum cylinder block has been In addition to the honing process, there is an increasing number of cases where a surface treatment for projecting silicon is performed.

In such a case, conventionally, for example, by first grinding the bore surface 2a of the cylinder bore portion 2 containing the primary crystal silicon 1 as shown in FIG. A rough honing process is performed to make the bore inner diameter approximately a predetermined size, and then, using a grindstone that does not crush the primary silicon 1 and does not easily clog the cylinder bore surface 2a as shown in FIG. 4 (b). Finishing honing is performed to finish the surface 2a of the bore smoothly by grinding, and then a corrosive liquid is supplied into the cylinder bore 2 to dissolve a small amount of aluminum on the surface 2a by a chemical reaction. As shown in (c), a surface corrosion treatment for projecting a small amount of the primary crystal silicon 1 is performed to impart lubricity and wear resistance to the cylinder bore surface 2a.

(Problems to be Solved by the Invention) However, in the above-described conventional processing and processing method in which the surface corrosion treatment is performed after the honing processing in order to project the primary crystal silicon 1 by a minute amount, in the surface corrosion treatment, the surface of the cylinder bore 2a is chemically reacted. Since aluminum is dissolved, in order to obtain uniform surface corrosion, it is necessary to perform careful cleaning with an organic solvent or an ultrasonic cleaner, and carefully degrease before the surface corrosion treatment. It is necessary to carefully perform cleaning after the surface corrosion treatment in order to prevent the progress of the above and prevent corrosion of the parts other than the bore surface 2a.

Therefore, according to the conventional processing and processing method described above,
As shown in the figure, the rough honing step 3, the finishing honing step 4, the pre-cleaning / degreasing step 5, the surface corrosion treatment step 6 and the post-cleaning step 7 need to be sequentially performed, and the number of steps increases. In addition, particularly in the pre-cleaning / degreasing step 5 and the post-cleaning step 7, since careful work is required and it takes time, there is a problem that productivity is low.

Further, in the above-mentioned conventional method, the number of steps is large, and particularly, the cleaning equipment using an organic solvent or an ultrasonic cleaner, the management equipment for the organic solvent and the corrosive liquid, and the corrosion prevention treatment of the equipment after the surface corrosion treatment step 6 Therefore, there is also a problem that the equipment cost increases.

The present invention provides a processing and processing method that advantageously solves such problems.

(Means for Solving the Problems) The present invention provides a method for processing and treating a surface of a high silicon aluminum bore according to claim 1, wherein the bore surface of the high silicon aluminum cylinder block is subjected to honing and surface treatment for projecting silicon. When performing the above, separately from the honing stone on the outer peripheral surface of the honing head, along with the outer peripheral surface of the honing head, an arc-shaped electrode having a thickness with a predetermined gap between the honing head and the bore surface is fixed. The cylinder block is used as a positive electrode while the electrode grinding liquid is supplied to the surface of the bore, and the electrode is used as a negative electrode to apply a voltage to perform honing.

Further, the method of processing and treating the surface of the high silicon aluminum bore according to claim 2 of the present invention provides a honing head when performing honing processing and surface treatment for projecting silicon on the bore surface of the high silicon aluminum cylinder block. , A holder is installed in place of the ordinary honing stone, and a narrow honing stone is provided in the holder, and an electrode extending along the narrow honing stone is moved forward and backward with respect to the bore surface. An insulator that is movably held and biases the electrode toward the surface of the bore, and that interposes a predetermined gap between the electrode and the surface of the bore on the surface of the electrode. A spacer made of aluminum is provided, and a voltage is applied with the cylinder block serving as a positive electrode and the electrode serving as a negative electrode while supplying electrolytic grinding liquid to the bore surface. One is characterized in that the honing.

(Operation) In this method, honing and electrolytic processing are simultaneously performed on the bore surface of the cylinder block, and only a very small amount of aluminum on the cylinder bore surface is finally produced by electrolysis during honing processing. It is excessively removed, and the primary crystal silicon is in a state of protruding by a minute amount.

In addition, since the clean cylinder bore surface that appears due to honing is electrolyzed here, careful cleaning and degreasing in the previous process are not required, and no corrosive solution for chemical reaction is used. Since only a weak electrolytic grinding liquid is used, the cleaning in the post process can be done to a normal degree.

Therefore, according to the method of the present invention, the pre-cleaning / degreasing step can be omitted, and the honing process and the surface treatment for projecting the silicon can be performed in the same process, so that the number of processes can be reduced as compared with the conventional method and the post-cleaning process can be performed. Since the working time of can be shortened, the productivity can be improved.

In addition, the number of processes can be reduced as described above, the post-cleaning process can be simplified, and management equipment for organic solvents and corrosive liquids and corrosion prevention treatment for equipment are not required. Can be made.

Further, according to the method of claim 1 of the present invention, a predetermined gap is provided between the outer surface of the honing head and the boring surface, which is fixed along the outer peripheral surface of the honing head separately from the honing stone. Since an arc-shaped electrode with a small thickness is used, the amount of removal of the bore surface by electrolytic corrosion treatment by energizing the electrode, which is performed at the same time as honing with a grindstone for honing, is adjusted to the time for honing. The amount of silicon protruding from the bore surface of the high-silicon aluminum cylinder block can be easily adjusted to an appropriate level when performing the processing and the processing simultaneously.

Further, according to the method of claim 2 of the present invention, the honing head is provided with a narrow honing stone in place of the ordinary honing stone mounted on the holder.
An electrode extending along the narrow honing stone is held so as to be movable back and forth with respect to the bore surface, and a spacer made of an insulator provided on the surface of the electrode between the electrode and the bore surface. The same effect as the method according to claim 1, since the electrode is biased toward the bore surface so as to maintain the gap even if the honing grindstone wears while providing a predetermined gap in the Can be easily achieved with a normal honing head.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view showing an apparatus used in a finishing honing process step in an embodiment of the method for processing and treating the surface of a high silicon aluminum bore according to the present invention.
Is a high silicon aluminum cylinder block, 9 is a honing head of a normal honing machine, and 10 is a nozzle for supplying electrolytic grinding fluid.

Here, in order to use the cylinder block 8 and the honing head 9 as electrodes, the cylinder block 8 and the honing head 9 are insulated from each other and provided with electric wirings respectively, and in addition, as shown in FIG. Along the outer peripheral surface of the, as needed, in this example, one circular arc-shaped auxiliary electrode
11 is attached while ensuring conductivity with the honing head 9.

In this embodiment, however, first of all, as shown in FIG. 4 (a), the bore surface 2a of the cylinder bore portion 2 containing the primary silicon 1 of the cylinder block 8 is ground by using a coarse diamond grindstone or the like. As a result, a normal rough honing process is performed in which the inner diameter of the bore has a substantially predetermined size.

Then, as shown in FIG. 1 and FIG. 2, a grindstone 12 is attached to the honing head 9 to attach the cylinder bore surface 2a to 20 μm.
Finishing electrolytic honing is performed in which aluminum in the cylinder bore surface 2a is electrolyzed and the primary crystal silicon 1 is projected by a minute amount while performing finish honing to smoothly finish the bore surface 2a by grinding approximately.

In this finishing electrolytic honing process, as shown in FIG. 1, a voltage is applied with the cylinder block 8 as a positive electrode, the honing head 9 and the auxiliary electrode 11 as a negative electrode, and the electrolytic grinding liquid 13 is introduced from the nozzle 10 into the cylinder bore.
The honing head 9 is inserted into the cylinder bore as indicated by an imaginary line in the drawing and is rotated and moved up and down as indicated by an arrow while pouring a sufficient amount of.

In this case, the grindstone 12 is preferably made of, for example, primary silicon 1 so that the primary silicon 1 is not crushed, aluminum is less likely to be clogged, and a short circuit between both electrodes can be prevented. Use a grindstone that has a soft contact with the abrasive grains, a large pocket for the binder, and sufficient insulation.

Further, here, the size and the number of the auxiliary electrodes 11 and the gap D between the cylinder bore surface 2a and the auxiliary electrode 11 are appropriately set so that only the aluminum on the cylinder bore surface 2a is not excessively removed. An electrolytic grinding liquid having an electrolytic action weaker than that of a usual electrolytic grinding liquid for aluminum is used, and the applied voltage is appropriately set in consideration of the honing processing time.

By this finishing electrolytic honing, finally, the aluminum on the surface 2a of the cylinder bore is excessively removed by a slight amount by electrolysis, and as shown in FIG. Only about 1.5μ is projected from the aluminum surface.

After that, the post-cleaning for cleaning the entire cylinder block 8 is performed.

That is, in the method of this embodiment, since the clean cylinder bore surface 2a appearing by the honing process is electrolyzed in the finishing electrolytic honing process, the pre-process such as the conventional pre-cleaning / degreasing process 5 is performed. No need for careful cleaning and degreasing in the rough honing process,
Only the finishing electrolytic honing process and the post-cleaning process are required.

In addition, here, since a corrosive liquid for chemical reaction is not used and only an electrolytic solution having weak corrosiveness is used, careful cleaning in a post-process such as the conventional post-cleaning process 7 is unnecessary, and the post-cleaning is not required. Normal level is enough.

Therefore, according to the method of this embodiment, the pre-cleaning and degreasing steps are omitted, and the honing process and the surface treatment for projecting silicon can be performed in the same process, and the number of processes can be reduced as compared with the conventional method, and the post-cleaning process can be performed. Since the working time in the process can be shortened, the productivity can be improved.

Further, according to the method of this embodiment, the number of steps can be reduced and the post-cleaning step can be simplified as described above, and further, the management equipment for the organic solvent and the corrosive liquid, and the corrosion prevention treatment for the equipment are unnecessary. Therefore, the equipment cost can be reduced.

FIGS. 3 (a) and 3 (b) are a plan view and a front view showing another example of a honing stone that can be used in the method of the present invention. Here, FIG. In b), the elongated electrode 15 is fitted to the holder 18 so as to be protruded and fixed upward and extend along the grindstone 14 and to be able to move back and forth in the same direction as the protruding direction of the grindstone 14. Support the electrode 15 and its holder
A spacer 16 made of an insulating material is provided at a plurality of positions of the electrode 15 for constantly urging it in a protruding direction by a spring 16 interposed between the spacer 17 and the spacer 17.

The insulator used as the spacer 17 must be one that does not scratch the surface of the cylinder bore, and for example, resin or glass can be used. Also, the above spring 16
Instead of this, a blade-shaped portion may be provided on the electrode 15 and the electrode 15 may be urged toward the surface of the cylinder bore by the hydrodynamic action between the electrode 15 and the electrolytic grinding fluid accompanying the movement thereof.

Even if the grindstone 14 is attached to the honing head 9 of the previous embodiment via the holder 18 and the finishing electrolytic honing process is performed in the same manner as in the previous embodiment, the same effect as in the previous embodiment can be obtained. You can

Although the present invention has been described above based on the illustrated example, the present invention is not limited to the above example. For example, even in the rough honing step, while supplying the electrolytic grinding liquid, the cylinder block is made the positive electrode and the honing head is used. Honing may be performed while applying a voltage with the provided electrode as a negative electrode. By doing so, the passivation film is removed by honing and the electrolytic removal efficiency is improved, so honing to a predetermined size is possible. It is performed in a short time, and the working time can be shortened.

In addition, when there is a small machining allowance that requires honing processing, if necessary, it is not divided into a rough honing processing step and a finishing honing processing step, and the honing processing step is regarded as one step, while supplying the electrolytic grinding liquid, Honing may be performed while applying a voltage to the cylinder block and the electrode provided on the honing head. By doing so, it is possible to further reduce the number of steps and further improve the productivity and the facility cost. Can be increased.

(Effect of the invention) Thus, according to the method of processing and treating the surface of the high silicon aluminum bore of the present invention, the pre-cleaning / degreasing step is omitted,
In addition, since the honing process and the surface treatment for protruding silicon can be performed in the same step, the number of steps can be reduced as compared with the conventional method, and the work time in the post-cleaning step can be shortened, so that the productivity can be improved. .

In addition, the number of processes can be reduced as described above, the post-cleaning process can be simplified, and management equipment for organic solvents and corrosive liquids and corrosion prevention treatment for equipment are not required. Can be made.

Further, according to the method of claim 1 of the present invention, the removal amount of the bore surface by the electrolytic corrosion treatment by energizing the electrodes, which is performed at the same time as the honing processing by the honing stone,
It can be set according to the time to perform the honing process,
The amount of protrusion of silicon from the bore surface of the high silicon aluminum cylinder block can be easily adjusted appropriately when the processing and the processing are simultaneously performed.

Further, according to the method of the second aspect of the present invention, the same effect as that of the method of the first aspect can be easily achieved with a normal honing head.

[Brief description of the drawings]

FIG. 1 is a side view showing an apparatus used in a finishing honing step in an embodiment of a method of processing and treating a high silicon aluminum bore surface of the present invention, and FIG. 2 is a bottom view showing a honing head of the above apparatus, FIG. Figures (a) and (b) are a plan view and a front view showing another example of a honing stone that can be used in the method of the present invention, and Figures 4 (a), (b) and (c) are high silicon aluminum bores. FIG. 5 is a cross-sectional view showing a state after processing and processing of the surface, and FIG. 5 is a process diagram showing a conventional processing and processing method. 2 …… Cylinder bore, 2a …… Cylinder bore surface 8 …… High silicon aluminum cylinder block 9 …… Honing head, 11 …… Auxiliary electrode 12,14 …… Whetstone, 13 …… Electrolytic grinding fluid 15 …… Electrode

Claims (2)

(57) [Claims] 1. A honing head outer peripheral surface is provided on the outer peripheral surface of the honing head separately from the honing head grinding stone when the boring surface of the high silicon aluminum cylinder block is subjected to honing processing and surface treatment for protruding silicon. A fixed arc-shaped electrode having a predetermined gap is formed between the electrode and the bore surface, and the cylinder block serves as a positive electrode while supplying an electrolytic grinding fluid to the bore surface. A method for processing and treating the surface of a high silicon aluminum bore, which comprises honing while applying a voltage as a negative electrode. 2. A honing head is provided with a holder in place of a normal grinding stone for honing, when honing and surface treatment for projecting silicon are applied to a bore surface of a high silicon aluminum cylinder block. , A narrow honing stone is provided, and an electrode extending along the narrow honing stone is held so as to be movable back and forth with respect to the bore surface, and the electrode is attached toward the bore surface. Momentum,
A spacer made of an insulator is provided on the surface of the electrode so as to intervene between the electrode and the surface of the bore to form a predetermined gap therebetween, and the cylinder of the cylinder is provided while supplying an electrolytic grinding liquid to the surface of the bore. A method of processing and treating a surface of a high silicon aluminum bore, wherein honing is performed while applying a voltage with the block as a positive electrode and the electrode as a negative electrode.