JP3069639B2 - Casting surface finishing method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for finishing a cast surface used for finishing a surface of a camshaft as a mechanical element of a valve system of an automobile, for example.

[0002]

2. Description of the Related Art As shown in FIG. 7, a camshaft as a casting W of this type is formed by forming a plurality of egg-shaped cam portions b on a camshaft main body a with grooves c.

[0003] When these castings are completed, castings and other deposits are present on the surfaces of the castings, and it is not necessary to completely remove them. However, from the viewpoint of commercial value and product quality, at least the castings are required. Finishing is done to polish the surface.

[0004]

Conventionally, however, such a finishing process is performed by manually or mechanically pressing a casting or the like on the outer peripheral surface of a rotating grinding wheel, so that the casting is formed by a cam. In the case of a round shaft-shaped member such as a shaft, the convex surface is pressed into contact with the convex surface, and the surface such as casting is removed in a concave shape by the outer peripheral surface of the grinding wheel. There is a disadvantage that the quality may be reduced.

[0005]

The object of the present invention is to solve such a problem.
The method according to claim 1 is characterized in that the surface of the casting is changed to the surface of the casting.
The pressure of the continuously running abrasive belt that can bend according to its shape
When finishing by contact , the above abrasive belt
Endless belt, the plurality of abrasive belts are opposed to each other.
Around the driven and driven rolls
There is provided a casting surface finishing method, wherein finishing is performed by pressing a plurality of polishing belts.

According to a second aspect of the present invention, there is provided a holding portion capable of holding a casting, a polishing belt capable of bending according to the surface shape of the casting, a belt running portion for continuously running the polishing belt, A pressure contact mechanism for pressing the casting and the polishing belt against each other, wherein the polishing belt has a plurality of endless bells.
And the plurality of polishing
Driving roll and driven roll capable of hanging belts in parallel
And a casting surface finishing apparatus.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 6 show a casting d which is present on the surface of a plurality of grooves c of a camshaft as a casting W. FIG.
This is an embodiment of the present invention applied to a structure for polishing the surface of a camshaft, wherein reference numeral 1 denotes a holding portion, in which case both ends of a camshaft main body a of a camshaft can be held and released.

Reference numeral 2 denotes a press-contact mechanism, which is configured to control the movement of the holding unit 1 so as to press the casting W against the polishing surface 3a of the polishing belt 3.

In this case, the polishing belt 3 is formed as an endless so-called endless belt. A polishing surface 3a made of an abrasive such as abrasive grains is formed on one surface, and a surface shape of a casting W is formed as a belt base material 3b. And a plurality of polishing belts 3 formed of a material and thickness that can be bent in accordance with the width of the groove portion c of the camshaft.

Reference numeral 4 denotes a belt traveling unit. In this case, a driving roll 6 and a driven roll 7 are laid on the machine base 5 and a driving motor 8 for rotating the driving roll 6 is mounted on the machine base 5. Guide circumferential grooves 6a, 7a corresponding to the widths of the respective polishing belts 3 are formed in the driven rolls 7, and a plurality of polishing belts 3 are arranged in parallel in a tensioned state by a tensioning mechanism 9 between the driving roll 6 and the driven rolls 7. And drive motor 8
A belt transmission mechanism 8a is interposed between the driving roller 6 and the
Each of the polishing belts 3 is configured to be continuously circulated by driving a drive motor 8.

Reference numeral 10 denotes an adjusting mechanism.
A guide member 11 that can be slid on the back surface of the polishing belt 3 is attached to the surface of the polishing belt 3, and the tension of the polishing belt 3 is adjusted by moving the guide member 11 forward and backward by an advance / retreat adjusting mechanism (not shown).
The pressure contact between the surface of the casting W and the polishing surface 3a of the polishing belt 3 is adjusted.

Since this embodiment has the above configuration,
A plurality of endless belt-shaped polishing belts 3 are circulated and driven by the drive of a drive motor 8 of the belt running unit 4, and the pressing mechanism 2
The position of the holding unit 1 is controlled by the above operation, whereby the polishing belt 3 is fitted into the groove c of the camshaft as the casting W, and the respective polishing belts 3 are pressed against the respective castings d by the pressing mechanism 2. By this, the surface of the casting d of the casting W can be finished, and this pressing force is applied by the pressing mechanism 2.
4 and FIG. 6, the adjustment can be performed by the adjusting mechanism 10 and the tensioning mechanism 9. In this case, as shown in FIG. 5, in the pressed state, the polishing belt 3 curves along the surface of the casting W so as to surround the surface of the casting W. Therefore, the pressure contact state between the surface of the casting W and the polishing belt 3 exhibits a contact state between the convex portion and the concave portion, so that the surface of the casting W, in this case, the surface of the casting d, has a convex shape of the casting d. Finishing is performed in a convex shape in accordance with the profile, so that a good finished state can be obtained.

When the finishing of one of the castings d is completed, the casting is turned 180 degrees by the holding portion 1, and the castings d on the opposite side are similarly finished by the polishing belt 3.

In this case, as the belt running unit 4, a driving roll 6 capable of hanging a plurality of polishing belts 3 in parallel is used.
In addition, since the driven rolls 7 are provided opposite to each other, the plurality of grooves c of the camshaft can be simultaneously polished and finished, the workability can be improved, and the processing cost can be reduced accordingly. And the structure can be simplified.

The present invention is not limited to the above embodiment. For example, a rotating structure is added to the holding portion 1 and the casting W is rotated about its axis during the press-welding, so that casting is performed. d, the entire surface of the groove c of the casting W can be finished, and the degree of tension of the polishing belt 2 can be determined in consideration of the height difference between the cam b and the groove c. Is absorbed by the curvature of the polishing belt 2, whereby the casting d of the cam portion b and the casting d
The entire surface of the cam portion b can be finished and processed, and the type of the polishing belt 3 is appropriately selected according to the casting.

[0016]

As described above, in the present invention according to the first or second aspect, the polishing belt is continuously run by the belt running section, and the holding section is controlled to move by the pressing mechanism and held by the holding section. By press-contacting the surface of the casting with the polishing belt, the surface of the casting can be finish-finished. Therefore, the pressure contact state between the surface of the casting and the polishing belt exhibits a contact state between the convex portion and the concave portion, so that a good finished state can be obtained , and the polishing belt comprises an endless belt.
The plurality of abrasive belts are arranged in parallel as a belt running section.
Driving and driven rolls that can be wound around
Can be polished simultaneously at multiple locations.
Workability, and reduce processing costs accordingly.
And the structure can be simplified.
You.

As described above, the intended purpose can be sufficiently achieved.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an embodiment of the present invention.

FIG. 2 is a partial plan view of the embodiment of the present invention.

FIG. 3 is a partial side sectional view of the embodiment of the present invention.

FIG. 4 is an enlarged side sectional view of the embodiment of the present invention.

FIG. 5 is an enlarged side sectional view of an embodiment of the present invention.

FIG. 6 is an enlarged side sectional view of the embodiment of the present invention.

FIG. 7 is a perspective view of a camshaft.

[Explanation of symbols]

 W Casting 1 Holding section 2 Press-contact mechanism 3 Polishing belt 4 Belt running section 6 Drive roll 7 Follower roll

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-224255 (JP, A) JP-A-5-31662 (JP, A) JP-A-10-244358 (JP, A) JP-A-10-1998 244359 (JP, A) JP-A-6-31434 (JP, A) Japanese Utility Model Laid-Open No. 50-45798 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 29/00 B24B 21 / 02

Claims (2)

(57) [Claims] 1. The surface of a casting is shaped according to the surface shape of the casting.
When performing finishing by pressing a continuous running abrasive belt that is bendable , the above-mentioned abrasive belt may have a plurality of endless belts.
And the plurality of polishing belts are opposed to each other by a driving roll.
And a finishing process performed by pressing the plurality of polishing belts around the driven rolls in parallel, and finishing the surface by pressing the plurality of polishing belts. 2. A holding portion capable of holding a casting, an abrasive belt that can bend in accordance with the surface shape of the casting, a belt running portion that continuously runs the abrasive belt, and press-contacting the casting with the abrasive belt. will and a pressure mechanism, the abrasive bell
Is composed of a plurality of endless belts,
The plurality of polishing belts can be driven in parallel.
Roll and driven rolls are opposed to each other.
Casting surface finishing device that.