JPH0691513A - Surface finish method for metal die formed product - Google Patents

Abstract

PURPOSE:To provide satisfactory surface finish by buffing a die formed product while abrasive grain added polishing fluid is fed using a buffing device with a rotating shaft in the surface finishing process of the die formed product. CONSTITUTION:An automobile wheel 1 is fixed horizontally on a rotary table 11 with its center aligned with the rotating center O-O of the table 11 and its design surface 2 faced upward. Also the lower end surface of a buff 13 installed at the lower end of a rotating shaft 12 is made in contact with the design surface 2. Then the rotary table 11 is rotated at a low speed while abrasive grain added polishing fluid is fed, and the buff 13 is rotated to polish the design surface 2. The rotating direction of the rotary table 11 is reversed at proper intervals, and the work portion is moved gradually in the circumferential direction. The buff 13 is formed with flexible material, for example, continuously foamed sponge, etc., with a foam ratio of approx. 3 to 5 times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of finishing the surface of a metal mold product.

[0002]

2. Description of the Related Art In the case of metal products, it has been performed manually for a long time because making the surface of the metal product an extremely bright finished surface enhances the added value of the metal product.

By the way, today's industrial mass-production technology is premised on the use of various processing machines, and even when determining how to finish the surface finish of metal products, mass-production technology using the processing machines. Whether or not it is established is an important factor.

From such a background, regarding the surface finishing of metal products, with respect to a plate material having a flat surface, a mechanical mass production technique for making the surface a very good finished surface has been established. Widely implemented.

[0005]

However, with respect to the surface of a die-molded product such as a cast product or a forged product in which unevenness is formed on the surface, there is unevenness on the surface, and in particular, the recessed portion provides a good finished surface. Since it is mechanically difficult, it is not done mechanically in general, and it is the current situation that it is mainly done by hand.

The present invention has been made under such circumstances, and is a surface for finishing a surface of a metal mold-molded article, which has been conventionally mainly done by hand, as a mechanically excellent finished surface. The purpose is to provide a finishing method.

[0007]

In order to achieve this object, the invention according to claim 1 is a method for finishing the surface of a metal mold product, in which a surface finishing step is finally carried out for the mold product. Inside, using a buffing device with a rotating shaft in a horizontal direction and having a flexible buff, while supplying a polishing liquid containing abrasive grains, bring the peripheral surface of the buff into contact with the surface of the metal molded product. It is characterized in that a first polishing step which is performed as described above is provided.

[0008]

According to the first aspect of the present invention, since the flexible buff is used, the surface can be polished by the buff according to the unevenness of the surface of the molded product.

Further, this buffing uses a polishing liquid,
Since it is so-called wet buffing, the rotation speed of the buff is slower than that of dry buffing that does not use a polishing liquid, so that the buff deformation can follow the unevenness of the surface well. , The surface is surely polished regardless of the presence of irregularities.

In addition, since the peripheral surface of the buff is brought into contact with the molded product by the buff device having the rotation axis in the lateral direction, the contact area between the buff and the molded product is linear contact and the area thereof is small,
Fresh abrasive grains can be reliably supplied to this contact area by the polishing liquid, and foreign matter such as buff residue can be effectively removed, so that a good finished surface can be obtained by buffing using a machine on the surface of the molded product. Obtainable.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. In this embodiment, the present technology is applied to the design side of a wheel for an automobile, which is a cast product made of an aluminum alloy. In addition, when the wheel for the car is attached to the car, the design side faces the outside of the car body,
A surface that forms part of the exterior of a car.

First, an automobile wheel material 1 as a molded product is cast by pouring a molten metal of an aluminum alloy (for example, AC4CH) into a mold formed into a required shape.

The wheel material 1 for an automobile thus obtained has a dimensional accuracy as an automobile wheel after being taken out of the mold, removed the weir and the like, and subjected to a predetermined machining at a required position. It has been secured.

Such an automobile wheel material 1 (cast product)
After that, each step shown in FIG. 2 is applied to the design surface 2 of the above, and finally the design surface 2 is obtained as a product as an automobile wheel finished to a mirror surface in a bright state.

In the automobile wheel material 1 in the above-mentioned state, a large number of irregularities are formed on the design surface 2 by the spoke portion 3, the through hole 4, the hub portion 5, the rim portion 6 and the like due to design requirements. (See Fig. 3, 4 etc.),
The design surface 2 is almost in a black state.

A black skin removing step is first performed on the design surface 2 in such a black skin state.

The black skin removing process of this embodiment is mainly performed in # 100-
It is carried out step by step with a polishing machine using a polishing cloth having # 320 abrasive grains. Depending on the size and shape of the unevenness of the design surface 2, a router of the same degree may be used supplementarily, or hand polishing work may be used in combination.

Further, the black skin removing step is not limited to the one using such an abrasive cloth paper, and other processing method capable of obtaining the same finished surface may be used.

With respect to the design surface 2 of the automobile wheel material 1 from which the black skin has been removed in the black skin removing process,
Next, a rough finishing process is performed.

The rough finishing process of this embodiment is performed in two steps, for example, by so-called dry buffing without using a polishing liquid.

That is, the first stage of this rough finishing process is
Using a sisal buff and a compound for medium finishing, the rotation speed is high, for example, about 2000 rpm.

The second step of the rough finishing process is performed at the same rotation speed as above using a very good finishing compound for a cotton buff having a rigidity lower than that of the sisal buff.

The surface finishing state of the design surface 2 at the time when such a rough finishing process is completed is the same state as the mirror finishing which can be mass-produced by a machine in the related art for a molded product.

According to the invention of the present application, the following preparatory finishing step and mirror finishing step are performed on the design surface 2 of the automobile wheel material 1 on which the rough finishing step has been completed.
With regard to die-molded products, we will establish a mirror surface finish that can be achieved only by the manual work of a skilled technician as a mechanical mass production technology.

The preliminary finishing step and the mirror finishing step are carried out by so-called wet buffing using a polishing liquid, and in this embodiment, they are divided into five stages as shown in FIG.

On the design surface 2 of the wheel material 1 for an automobile, which has been subjected to the rough finishing process of dry buffing as described above, first, as the first step of the preliminary finishing process, first, the electrolytic composite type vertical shaft wet buff is used. A processing step is performed.

The contents of the electrolytic composite vertical axial wet buffing process are as follows (see FIGS. 8 and 3 and 4).

That is, in this electrolytic composite type vertical shaft wet buffing process, the wheel material 1 for an automobile has its center on the rotary table 11 and the center of rotation O of the rotary table 11.
The design surface 2 is fixed in an upward horizontal posture, and the design surface 2 is polished by the lower end surface of the buff 13 attached to the lower end portion of the rotary shaft 12 hanging from above.

The rotary table 11 is rotationally driven at a low speed during processing, and sequentially displaces the processed portion by the buff 13 in the circumferential direction. The rotary table 11 of this embodiment reverses its rotation direction at appropriate time intervals (for example, 30 seconds).

The buff 13 is made of an extremely flexible material as compared with a conventional buff, and in this embodiment, a sponge material having a high expansion ratio (for example, 3 to 5 times) and continuous cells. It is formed by. The buff 13 is not limited to the sponge material, and a buff made of another material may be used as long as it is flexible to the same degree.

Therefore, this buff 13 has a design surface 2
Despite the unevenness on the surface, as shown in FIG.
The lower end surface can surely maintain the contact state on the design surface 2. The pressing force of the buff 13 on the design surface 2 is
For example, it is as small as 1 kgf / cm ² or less.

Then, on the upper part of the buff 13, the buff 1
An electrode 14 having a shape corresponding to the planar shape of No. 3 is installed (see FIG. 8), and this electrode 14 is used for performing the electrolytic processing function described later.

The rotary shaft 12 for supporting the buff 13 at the lower end is an elevating device 15 composed of a hydraulic cylinder or the like.
The rotation shaft 12 is driven at, for example, 300 rpm so that the rotation speed of the buff 13 is extremely low such as 10 m / sec or less. In the case of this embodiment, The rotation speed of the buff 13 is, for example, 4 m / sec.

This is to allow the flexible material forming the buff 13 to be surely deformed following the unevenness while maintaining the contact state with the unevenness of the design surface 2.

The rotation direction of the rotary shaft 12 is driven to rotate in the same direction as the rotation direction of the rotary table 11, and when the rotation direction of the rotary table 11 is reversed. In addition, the rotating shaft 12 is pulled up by the elevating device 15, the buff 13 is separated from the design surface 2 upward, and the rotating direction of the rotating shaft 12 is also reversed.

Therefore, even if the rotating direction of the rotating table 11 is reversed, the rotating direction of the rotating table 11 and the rotating direction of the buff 13 are always maintained in the same direction.

A shaft hole 12a is formed in the rotary shaft 12 (FIG. 8), and a polishing liquid containing abrasive grains is supplied to the central portion of the buff 13 through the shaft hole 12a. It is like this. This polishing liquid also functions as an electrolytic liquid in the electrolytic processing described later, and in this embodiment, it is an aqueous solution containing alumina having a particle diameter of 10 μm as abrasive grains and a surfactant added.

Further, in this embodiment, as shown by phantom lines in FIG. 4, the polishing liquid nozzle 1 for supplying the same polishing liquid as the above toward the contact portion between the buff 13 and the design surface 2.
6 is provided so that fresh abrasive grains can be reliably supplied to the buff 13.

The supply of the polishing liquid from the polishing liquid nozzle 16 is continued even when the rotating direction of the rotary table 11 is reversed, so that the buff 13 of the buff 13 is reversed when the rotary table 11 is reversed. At the time of ascending, the polishing liquid is sprayed toward the portion that was immediately below the buff 13, so that the buff residue and other foreign matter that are interposed between the buff 13 and the design surface 2 can be effectively removed. There is an advantage that can be.

As shown in FIG. 8, the electrolytic machining in the electrolytic composite vertical axial wet buffing process is performed in combination with the vertical axial wet buffing described above.

That is, the electrolytic processing in this embodiment is performed by the DC power supply 17 and the polishing liquid which are interposed between the electrode 14 and the automobile wheel material 1, and the electrode 14 is On the plus side, the design surface 2 of the automobile wheel material 1 is connected to the minus side.

Between the electrode 14 and the design surface 2, the polishing liquid supplied from the shaft hole 12a of the rotary shaft 12 or the polishing liquid supplied from the polishing liquid nozzle 16 is a continuous-cell sponge material. Since the buff 13 formed in step 1 is infiltrated and exists, the buff 13 is dipped into the buff 13 and the direct current power source 1
An electrolytic circuit from 7 is formed, and on the surface of the design surface 2, electrolytic processing is performed at the same time as buffing with the abrasive grains, and electrolytic composite type buffing is performed.

Therefore, in this electrolytic composite type vertical shaft wet buffing process, the processing efficiency is better than that in the normal buffing process.

After the completion of the electrolytic composite vertical axial wet buffing process, the design surface 2 is subjected to the horizontal axial wet buffing process. In the following description, in order to avoid confusion, this horizontal axis wet buffing step will be referred to as a preliminary finishing horizontal axis wet buffing step.

The contents of this preliminary finishing horizontal axis wet buffing process are as follows (see FIGS. 5, 6 and 7).

That is, also in this preliminary finishing horizontal axis wet buffing process, the wheel material 1 for an automobile is placed on the rotary table 21 with its center aligned with the rotation center O of the rotary table 21 so that the design surface 2 faces upward. The rotary shaft 22a fixed to the posture and extending from the left and right sides above it,
The design surface 2 is polished by the peripheral surfaces of the buffs 23a and 23b mounted on the 22b.

The rotary table 21 is rotationally driven at a low speed only in a fixed direction during processing, and sequentially displaces the processed portion by the buff 13 in the circumferential direction.

The buffs 23a and 23b are made of a flexible material, and in this embodiment, they are made of a urethane foam material having a high expansion ratio (for example, 3 to 5 times) and closed cells. is there. In addition, these buffs 23a, 2
In 3b, if the material has the same flexibility,
A buff made of that material may be used.

Then, the buffs 23a and 23b of this embodiment are
Are attached by penetrating through the rotary shafts 22a and 22b in a laminated state of a plurality of buff members (five in the case shown in the drawing) of appropriate thickness, and setting the peripheral surface shape of the buffs 23a and 23b as a whole. The design surface 2 has a shape similar to the radial cross-sectional shape (see FIG. 6).

Therefore, these buffs 23a, 23b
In spite of the presence of irregularities in the radial direction of the design surface 2, the peripheral surface of the design surface 2 can be reliably maintained in a line contact state in the radial direction on the design surface 2.

As described above, since the buffs 23a and 23b are in line contact with the design surface 2 in the preliminary finishing horizontal axis wet buffing process, the polishing force by the abrasive grains supplied as described later is large, and the electrolytic composite is used. It is possible to effectively eliminate traces of electrolysis caused by the vertical shaft wet buffing process.

Moreover, since these buffs 23a and 23b are abscissa and the contact portion with the design surface 2 has an arc shape, the buffs 23a, 23b are deeply penetrated into the recess formed on the design surface 2 and the inside of the recess is It is relatively easy to polish.

Since the contact between the buffs 23a and 23b and the design surface 2 is in a line contact state, if the buffs 23a and 23b are set on the design surface 2 so as to be preliminarily bent, they will be described later. As described above, the bending of the recesses on the design surface 2 is also released, so that the peripheral surfaces of the buffs 23a and 23b can be reliably brought into contact with each other.

Also in this preliminary finishing horizontal axis wet buffing process, the rotation speed of the rotating shafts 22a and 22b is, for example, 100 to 500 rpm and a low speed of 0.8 to 10 m / sec, and the flexible buff 23a, It is the same as in the case of the electrolytic composite vertical shaft wet buffing process that the inside of the concave portion is surely contacted by releasing the bending of 23b.

In this embodiment, the rotation direction of the rotary shaft 22a is designed to rotate in the same direction as the rotation direction of the rotary table 21, and the rotation direction of the other rotary shaft 22b is opposite. Has become.

The design surface 2 of the buffs 23a and 23b which are rotationally driven by the rotary shafts 22a and 22b.
Toward the part on the side where the contact with the polishing liquid starts,
26b are installed respectively.

Incidentally, these polishing liquid nozzles 26a, 26
The polishing liquid supplied by spraying from b is the same as the above, and is an aqueous solution containing alumina having a particle diameter of 10 μm as abrasive grains and a surfactant added, whereby the buffs 23a and 23b are supplied. The supply of fresh abrasive grains is performed.

In the horizontal axis wet buffing process in which the rotary shafts 22a and 22b are placed in a substantially horizontal posture and buffing is performed on the peripheral surfaces of the buffs 23a and 23b as in the preliminary finishing horizontal axis wet buffing process. As described above, since the contact area between the buffs 23a and 23b and the design surface 2 is linear as described above, fresh abrasive grains can be reliably supplied into the contact area by spraying from the polishing liquid nozzles 26a and 26b. In addition, it can be easily washed away with a polishing liquid sprayed with foreign matter such as buff residue.

For this reason, the design surface 2 has a good finished surface according to the abrasive grains to be used in the following manner regardless of the unevenness by the preliminary finishing horizontal axis wet buffing process. be able to.

That is, as shown in FIG. 7, the buff 23
When a required amount of deflection d is given to a and 23b and set,
The lower ends of the peripheral surfaces of the buffs 23a and 23b can be made to reach a portion lower by an amount corresponding to the amount of bending according to the opening of the bending d.

When unevenness exists in the circumferential direction of the design surface 2, each buff 23a, 23b also comes into contact with the inside of the recess if the depth of the unevenness is approximately the dimension d or less, and the polishing liquid is By supplying, it means that wet buffing is performed also in the recess.

In this embodiment, the buffs 23a and 23b whose rotation directions are opposite to each other are arranged so as to be in contact with the design surface 2. This is because the wheel material 1 for an automobile is rotated by the rotary table 21. By being driven in one direction, the contact of the buffs on both sides in the circumferential direction of the spoke portion 3 extending in the radial direction on the design surface 2 is made uniform, and the buffing state on both sides of the spoke portion 3 is made uniform. This is because

As mentioned above, these buffs 23a, 23
Since b is processed along with the change in deflection d, the buff 23
a, 23b themselves generate heat, but these buffs 23a, 2b
Since the polishing liquid is directly applied to the bent portion of 3b as described above, there is an advantage that it contributes to the extension of the life of the buffs 23a and 23b.

The design surface 2 on which the preliminary finishing horizontal axis wet buffing step has been completed is then subjected to the vertical axis wet buffing step. In the following description, in order to avoid confusion, the vertical shaft wet buffing process will be referred to as prefinishing vertical shaft wet buffing process.

This preliminary finishing vertical shaft wet buffing process is
It is performed by the same device (see FIGS. 3 and 4) used in the electrolytic composite vertical shaft wet buffing process described above, but the electrolytic processing related devices such as the electrode 14 and the DC power supply 17 (FIG. 8) are provided. Only the difference is not.

In the following, the prefinishing axial wet buffing process will be described using the same reference numerals as those common to the above.

That is, in this prefinishing vertical shaft wet buffing process, the lower end of the rotary shaft 12 suspended from above on the design surface 2 of the wheel material 1 for an automobile installed on the rotary table 11 in the same manner as described above. Buff attached to the part 1
The design surface 2 is polished by the lower end surface of the electrode 3, and the electrolytic processing as described above is not performed.

Also in this preliminary finishing vertical shaft wet buffing process, the rotation table 11 is driven at a low speed as in the above case, and the rotation direction is not reversed every appropriate time (for example, 30 seconds). It is the same.

Further, the buff 13 is formed of a material which is extremely flexible as compared with the conventional buff, and in this embodiment, it is also formed of the same kind of open cell sponge material having a high expansion ratio. Is.

Due to these circumstances, even though the buff 13 has a small pressing force against the design surface 2 of, for example, 1 kgf / cm ² or less, the buff 13 has unevenness on the design surface 2. Similarly, as shown in FIG. 4, the lower end surface can surely maintain the contact state on the design surface 2.

The rotating shaft 12 supporting the buff 13 at the lower end is driven at a low speed of, for example, about 300 rpm, and the rotation speed of the buff 13 is extremely low at about 10 m / sec or less (for example, 4 m / sec). At the same time, the rotation shaft 12 is held by the lifting device 15, and when the rotation direction of the rotation shaft 12 reverses the rotation direction of the rotary table 11, the lifting device 15 causes the rotation shaft 12 to rotate. The buff 13 is separated from the design surface 2 upward, and the rotation direction of the rotary shaft 12 is also reversed, so that the buff 13 is rotationally driven in a direction coinciding with the rotation direction of the rotary table 11. It is the same.

As in the above, the contact portion between the buff 13 and the design surface 2 is supplied with a polishing liquid of the same composition containing alumina having an average particle diameter of 10 μm as abrasive grains and wet buffing. Is performed.

The reason why the preliminary finishing vertical axis wet buffing step is carried out after the preliminary finishing horizontal axis wet buffing step is that the polishing marks caused by the preliminary finishing horizontal axis wet buffing step are This is because it is erased by a preliminary finishing vertical axis wet buffing process in which polishing is performed in a direction intersecting with.

In this preliminary finishing vertical shaft wet buffing process, since the buff 13 is flexible and the rotation speed thereof is low, the followability to the irregularities on the design surface 2 is good and the irregularities exist. Regardless, the design surface 2 can be surely polished, and the foreign matter caught immediately below the buff 13 can be effectively removed by the polishing liquid by the elevating operation of the buff 13 when the rotary table 11 is inverted. It has an advantage that a very good finished surface can be surely obtained.

The automobile wheel material 1 for which the preliminary finishing process up to such a preliminary finishing vertical shaft wet buffing process has been completed is then subjected to a mirror finishing process as a mirror finishing process (corresponding to the surface finishing process of the present application). A horizontal axis wet buffing process (corresponding to the first polishing process of the present invention) is performed (FIG. 5, FIG.
6 and 7).

This mirror finishing horizontal axis wet buffing step is performed in substantially the same manner as the above-mentioned preliminary finishing horizontal axis wet buffing step, although only the polishing liquid is different. The description thereof will be omitted, and only the matters related to the differences will be described below.

That is, the polishing liquid used in the mirror finishing horizontal axis wet buffing process of this embodiment is an aqueous solution containing alumina having a particle diameter of 1 μm as abrasive grains and a surfactant added thereto.

This mirror finishing horizontal axis wet buffing step is performed subsequent to the prefinishing vertical axis wet buffing step by performing the prefinishing vertical axis wet buffing using abrasive grains having a grain size of 10 μm. The reason is that the polishing marks due to the processing step are erased by using abrasive grains having a grain size of 1 μm to increase the brilliance. The horizontal axis wet buffing has a large polishing force by the buffs 23a and 23b and has a small grain size This is because even if it is a wet buffing process using the above-mentioned abrasive grains, the previous polishing mark can be efficiently erased, and a finished surface in an extremely excellent bright state can be obtained.

In the mirror finishing horizontal axis wet buffing step, because of the same reason as in the preliminary finishing horizontal axis wet buffing step, it is in line contact and it is easy to supply fresh abrasive grains. The buffs 23a and 23b can be reliably blown because the polishing power of the abrasive grains is large, the inside of the concave portion of the design surface 2 can be polished, and the polishing liquid can be directly sprayed on the portions of the buffs 23a and 23b where the bending occurs. It has the advantage that it can be cooled to a low temperature.

Thereafter, the wheel material 1 for an automobile is subjected to a mirror-finished vertical axis wet buffing process (corresponding to the second polishing process of the present application) (see FIGS. 3 and 4) and finally the automobile. The design surface 2 of the wheel 1 is finished in a mirror state.

This mirror finishing vertical axis wet buffing process is as follows.
Although only the polishing liquid is different, the prefinishing vertical shaft wet buffing process is performed in substantially the same manner, so that the description of the common apparatus and method etc. will be omitted, and the differences will be related. Only the items to be described will be described below.

That is, the polishing liquid used in the mirror finishing vertical axis wet buffing process of this embodiment contains alumina having a particle size of 1 μm as abrasive grains. It is the same as the polishing liquid in the process.

This mirror finishing vertical axis wet buffing process
What is performed after the mirror finishing horizontal axis wet buffing step is that the mirror finishing horizontal axis wet buffing step has a large polishing force, and the minute polishing traces caused by this are the same as those containing abrasive grains of the same particle size. This is for erasing by polishing in the direction intersecting with the previous polishing mark by using the above polishing liquid.

The finished surface of the design surface 2 thus obtained is in a mirror-finished state equivalent to a mirror-finished product finished by a skilled worker by hand, as compared with a conventional molded product.

In this mirror finishing vertical axis wet buffing step, the same flexible buff 13 as in the preliminary finishing vertical axis wet buffing step is used, and the rotation speed is low. The flatness of the design surface 2 to the irregularities is good, and the design surface 2 can be surely polished regardless of the presence of the irregularities. The foreign matter that has been caught can be effectively removed with a polishing liquid, and an extremely good finished surface can be reliably obtained.

As described above, in this embodiment, an aluminum alloy cast product is targeted, and both the preliminary finishing step and the mirror finishing step are performed by wet buffing. The fine pores and pinholes formed on the surface of the product can be closed or reduced in diameter by the contact friction of the buff, which reduces defects on the finished surface of the cast product and improves the finish. There is an advantage that the surface can be obtained.

The present invention can be applied not only to the design of automobile wheels but also to the mirror finish of ornaments and other various molded products, and it can be applied to not only cast products but also forged products. can do.

The material of the object is not limited to the aluminum alloy, but any copper alloy or other metallic material to be mirror-finished may be used.

[0089]

As described above, according to the first aspect of the invention, since the flexible buff is used, the surface can be polished by the buff according to the unevenness of the surface of the molded product.

Further, this buffing uses a polishing liquid,
Since it is so-called wet buffing, the rotation speed of the buff is slower than that of dry buffing that does not use a polishing liquid, so that the buff deformation can follow the unevenness of the surface well. , The surface is surely polished regardless of the presence of irregularities.

Moreover, since the peripheral surface of the buff is brought into contact with the molded product by the buffing device having the rotation axis in the lateral direction, the contact area between the buff and the molded product is linear contact and its area is small. Since it is possible to reliably supply fresh abrasive grains with the polishing liquid and effectively remove foreign matter such as buff residue, it is possible to obtain a good finished surface by buffing using a machine on the surface of the molded product. .

Furthermore, since the area of the contact area is reduced by using a flexible buff with a buff device having the rotation axis in the horizontal direction, the polishing liquid can be reliably supplied in the vicinity of the contact area. The buff itself can be effectively cooled by the elastic deformation of the buff, and there is a secondary advantage that the life of the flexible buff can be increased.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a polishing process in a preliminary finishing process and a mirror finishing process.

FIG. 2 is a process explanatory diagram of the entire surface finishing process.

FIG. 3 is a top view for explaining a vertical axial wet buffing process.

4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a top view for explaining a horizontal axis wet buffing process.

6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 is an explanatory diagram of a contact state of a buff with a spoke portion in a horizontal axis wet buffing process.

FIG. 8 is an explanatory diagram of an electrolytic composite vertical shaft wet buffing process in a BB cross section of FIG. 3;

[Explanation of symbols]

 1 Wheel material for automobile (molded product) 2 Design surface (surface) 12, 22a, 22b Rotating shaft 13, 23a, 23b Buff 14 Electrode 17 DC power supply

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[Procedure amendment]

[Submission date] January 19, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

In order to achieve this object, the invention according to claim 1 is a method for finishing the surface of a metal mold product, in which a surface finishing step is finally carried out for the mold product. It is characterized in that a first polishing step is carried out, in which a peripheral surface of a flexible buff is brought into contact with the surface of a metal mold-molded product while supplying a polishing liquid to which abrasive grains are added.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010] Moreover, since the contacting circumferential surfaces of the bar off the molded article, buff and the contact area between the molded article is a line contact area thereof is small, certainly fresh by polishing solution during the contact area Since fine abrasive grains can be supplied and foreign matters such as buff residue can be effectively eliminated, a good finished surface can be obtained by buffing the surface of the molded product by using a machine.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

That is, in this electrolytic composite type vertical shaft wet buffing process, the wheel material 1 for an automobile has its center on the rotary table 11 and the center of rotation O of the rotary table 11.
The design surface 2 is fixed in an upward horizontal posture, and the design surface 2 is polished by the lower end surface 19 of the buff 13 attached to the lower end portion of the rotary shaft 12 hanging from above.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

Therefore, this buff 13 has a design surface 2
Despite the unevenness on the surface, as shown in FIG.
The lower end surface 19 can surely maintain the contact state on the design surface 2. The pressing force of the buff 13 on the design surface 2 is small, for example, 1 kgf / cm ² or less.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction content]

That is, also in this preliminary finishing horizontal axis wet buffing process, the wheel material 1 for an automobile is placed on the rotary table 21 with its center aligned with the rotation center O of the rotary table 21 so that the design surface 2 faces upward. The rotary shaft 22a fixed to the posture and extending from the left and right sides above it,
The peripheral surfaces 29a, 2 of the buffs 23a, 23b mounted on the 22b.
9b is to polish the design surface 2.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

Therefore, these buffs 23a, 23b
In spite of the presence of unevenness in the radial direction of the design surface 2, the peripheral surfaces 29a and 29b of the design surface 2 can be reliably maintained in the linear contact state in the radial direction on the design surface 2.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction content]

Since the contact between the buffs 23a and 23b and the design surface 2 is in a line contact state, if the buffs 23a and 23b are set on the design surface 2 so as to be preliminarily bent, they will be described later. As described above, the flexure is also released to the concave portion on the design surface 2, so that the peripheral surfaces 29a and 29b of the buffs 23a and 23b can be surely brought into contact with each other.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0060

[Correction method] Change

[Correction content]

That is, as shown in FIG. 7, the buff 23
When a required amount of deflection d is given to a and 23b and set,
The peripheral surface of each buff 23a, 23b according to the opening of the deflection d
The lower ends of 29a and 29b can reach a portion lower by an amount corresponding to the amount of bending.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0067

[Correction method] Change

[Correction content]

That is, in this prefinishing vertical shaft wet buffing process, the lower end of the rotary shaft 12 suspended from above on the design surface 2 of the wheel material 1 for an automobile installed on the rotary table 11 in the same manner as described above. Buff attached to the part 1
The lower surface 19 of 3 is used to polish the design surface 2,
Electrochemical machining as described above is not performed.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] 0070

[Correction method] Change

[Correction content]

Due to these circumstances, even though the buff 13 has a small pressing force against the design surface 2 of, for example, 1 kgf / cm ² or less, the buff 13 has unevenness on the design surface 2. As shown in FIG. 4, its lower end surface 1
It is the same that 9 can surely maintain the contact state on the design surface 2.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0091

[Correction method] Change

[Correction content]

[0091] Moreover, since the contacting circumferential surfaces of the bar off the molded article, the area is small in contact area line contact between the buff and the molded article, it ensures fresh by polishing solution in this contact area Since the abrasive grains can be supplied and foreign matters such as buff residue can be effectively eliminated, a good finished surface can be obtained by buffing the surface of the die-molded product using a machine.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0092

[Correction method] Change

[Correction content]

[0092] Further, before SL contact area regions rather small, since the polishing liquid can be reliably supplied to the vicinity of the contact region, it is possible to effectively cool the heat generated by the buffing itself by elastic deformation of the contact area There is a side benefit of increasing the life of the flexible buff.

[Procedure Amendment 15]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 16]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure Amendment 17]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

[Procedure 18]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

[Procedure Amendment 19]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (4)

[Claims] 1. A method of finishing the surface of a metal mold product, which is a buffing device having a rotation axis in a lateral direction and having a flexible buff during a surface finishing step which is finally performed on the mold product. The surface finishing method is characterized in that the first polishing step is performed by bringing the peripheral surface of the buff into contact with the surface of the metal mold-molded article while supplying a polishing liquid containing abrasive grains. 2. The surface finishing method for a metal mold-formed product according to claim 1, wherein during the surface finishing step, the buffing device has a rotating shaft in a vertical direction together with the first polishing step. A second polishing step is also performed, in which a soft buff is used, and the end surface of the buff is brought into contact with the surface of the metal molded product while supplying a polishing liquid containing abrasive grains. And surface finishing method. 3. The surface finishing method for a metal mold-formed product according to claim 1, wherein a buffing device having a flexible buff is used to supply a polishing liquid containing abrasive grains prior to the surface finishing step. While performing the preliminary finishing step by contacting the buff with the surface of the metal mold product, the grain size of the abrasive grains in this preliminary finishing step is set to be larger than the grain size of the abrasive grains in the surface finishing step. A surface finishing method characterized by being present. 4. The surface finishing method for a metal molded article according to claim 3, wherein an electrode is installed on the buff in the preliminary finishing step, and a DC voltage is applied between the electrode and the metal molded article. The surface finishing method is characterized in that the electrolytic finishing is performed at the same time as the preliminary finishing by the buff.