JP3069640B2 - 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. 6, a camshaft as a casting W of this kind 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 finishing 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 comes into pressure contact with the convex surface, and the surface of the casting or the like is removed and finished 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.
A pair of opposing grinding wheels that can be bent according to the shape and run continuously
Transferred between the belts, facing the pair of abrasive belts
When finishing facing surfaces of castings by simultaneous pressure welding ,
The polishing belt comprises a plurality of endless belts.
Each polishing belt is a pair of driving and driven rolls
And the plurality of polishing belts are pressed against each other.
Ri in the casting surface finishing method characterized by finishing to.

According to a second aspect of the present invention, there is provided a holding portion capable of holding a casting, a pair of opposing polishing belts capable of bending according to the surface shape of the casting, and a belt for continuously running the respective polishing belts. a traveling portion, and a transfer mechanism for transferring the casting face simultaneously pressed capable between the counter pair of abrasive belts Bei
The above-mentioned abrasive belt consists of a plurality of endless belts.
The plurality of abrasive belts are used as the belt running unit.
A drive roll and a driven roll that can be wound in parallel
The casting surface finishing apparatus characterized by having the above configuration .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show an embodiment of the present invention which is applied to a structure for simultaneously polishing the surfaces of respective castings d present on the facing surfaces of a plurality of grooves c of a camshaft as a casting W. In the embodiment, reference numeral 1 denotes a holding portion, in which case both ends of the camshaft main body a of the camshaft can be held and released.

Reference numeral 2 denotes a transfer mechanism which transfers the casting W between the polishing surfaces 3a of the pair of opposing polishing belts 3, 3 in the running direction of the polishing belt surfaces 3.3 so that the casting W can be simultaneously pressed against the polishing surfaces. It is configured to control the transfer of the holding unit 1.

In this case, the abrasive belts 3 are formed as endless so-called endless belts, the surfaces of which are formed with abrasive surfaces 3a, 3a made of abrasive material such as abrasive grains, and cast as belt bases 3b, 3b. It is formed of a plurality of abrasive belts 3, 3 formed of a material and a thickness that can be bent according to the surface shape of W, and having a width adapted to the width of the groove c of the camshaft.

Reference numeral 4 denotes a belt running unit. In this case, a driving roll 6 and a driven roll 7
7 is mounted horizontally, and a drive motor 8.8 for rotating the drive rolls 6.6 is attached to the machine base 5. Each drive roll 6.6 and each of the driven rolls 7.7 have the same width as the polishing belt 3.3. Guide circumferential grooves 6a, 7a corresponding to the driving rolls 6, 6 are formed.
And a plurality of polishing belts 3.3 between driven rolls 7
Are wound in parallel in a tensioned state by a tensioning mechanism 9, a belt transmission mechanism 8 a is interposed between the drive motors 8.8 and the drive rolls 6, and a pair of the respective polishing belts 3 are driven by the drive motor 8. 3 is configured to run continuously in the vertical direction.

Reference numeral 10 denotes an adjusting mechanism.
Guide member 1 capable of slidingly contacting the back surface of each polishing belt 3
Each of the polishing belts 3 is provided by attaching a resilient mechanism 11 comprising a spring member capable of resiliently pressing the guide member 11 and adjusting the guide member 11 by a reciprocating adjustment mechanism (not shown). 3 is adjusted so as to adjust the respective press-contact forces between the surface of the casting W and the polishing surfaces 3a of the polishing belts 3.3.

Since this embodiment has the above configuration,
By driving the drive motor 8 of the belt running unit 4, the pair of endless belt-shaped grinding belts 3, 3 are circulated and run in different directions from each other, and the transfer mechanism 2 moves the casting W to the pair of grinding belts 3, 3. 3 is moved downward from above between the polishing surfaces 3a, 3a, whereby the polishing belt 3 is fitted into the groove c of the camshaft as the casting W, and each of the castings d, d By bringing the polishing belts 3 into pressure contact with each other, it is possible to simultaneously finish the facing surfaces of the casting W where the castings d and d are present, thereby improving the finishing workability. It can be adjusted by the adjusting mechanism 10 and the tensioning mechanism 9 as shown in FIG.
Is curved following the surface 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.
In this case, the surface of the cast d · d is finished in a convex shape following the convex shape of the cast d · d, so that a good finished state can be obtained.

Further, in this case, the driving roller 6 and the driven roller 7 which can hang a plurality of polishing belts 3 in parallel are arranged as the belt running portion 4 so that the camshaft is formed. The facing surfaces of the plurality of grooves c can be simultaneously polished and finished, so that the workability can be improved, the processing cost can be reduced accordingly, and the structure can be simplified.

The present invention is not limited to the above-described embodiment. For example, a rotating structure may be added to the holding unit 1 to rotate and transfer the casting W about the axis during pressing. The entire surface of the groove c of the casting W including the castings d and d can be finished and the degree of tension of the polishing belt 3 is determined in consideration of the height difference between the cam b and the groove c. The height difference is absorbed by the curvature of the polishing belt 3, whereby the entire surface of the cam portion b including the casting d of the cam portion b and the casting d can be finished. In the embodiment, the abrasive belts 3 are arranged vertically in the vertical direction, but may be arranged laterally. The type of the abrasive belt 3 is appropriately selected according to the casting. You.

[0015]

According to the present invention, as described above, in the invention according to claim 1 or 2, the pair of opposing polishing belts are caused to continuously run by the belt running portion, and the casting is moved by the transfer mechanism to the pair of opposing polishing belts. Between the castings, thereby finishing the facing of the casting surface at the same time, thereby improving the finishing workability.In this pressed state, the abrasive belt follows the surface of the casting so as to surround the casting surface. Curved, therefore, the pressure contact state between the facing of the casting surface and each polishing belt exhibits a contact state between the convex portion and the concave portion, so that the facing of the casting surface can be satisfactorily finished, and the polishing belt is It is composed of an endless belt, and as the belt running section, a drive roll and a driven roll capable of looping the plurality of polishing belts in parallel are provided opposite to each other, and the facing of a plurality of portions of the casting is simultaneously polished. Can be raised, it is possible to improve the workability, it is possible to simplify the structure it is possible to reduce the much processing cost.

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 a perspective view of a camshaft.

[Explanation of symbols]

 W Casting 1 Holding unit 2 Transfer mechanism 3 Abrasive belt 4 Belt running unit 6 Drive roll 7 Follower roll

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (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.
Transfer between a pair of opposing abrasive belts that can be bent continuously
And a pair of opposed abrasive belts are pressed against each other simultaneously.
When finishing the facing surface of the casting , the above polishing belt
Consists of a plurality of endless belts, and the plurality of polishing belts
Is wound in parallel on the opposing drive roll and driven roll.
And a finishing process by press- contacting the plurality of polishing belts . 2. A holding portion capable of holding a casting, a pair of opposed polishing belts that can bend according to the surface shape of the casting, a belt running portion that continuously runs the respective polishing belts, and the pair of opposed polishing members. And a transfer mechanism for transferring the casting between the belts so that the castings can be simultaneously pressed against each other.
Endless belts.
A drive roll capable of looping a plurality of polishing belts in parallel
And a driven roll facing the casting surface finishing apparatus.