JP2808978B2 - Honing head for high silicon aluminum bore - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high silicon aluminum cylinder block having a high silicon content, in which primary crystal silicon is deposited, used for eliminating a cylinder liner for reasons such as weight reduction and compactness of an engine. The present invention relates to a honing head used for performing rough honing and finish honing on a surface.

[0002]

2. Description of the Related Art As a honing head as described above, there is a conventional honing head, for example, which is denoted by reference numeral 1 in FIGS. 3 (a) and 3 (b). The honing head 1 is arranged radially with respect to its axis. And a body 2 which is fixed to a main shaft of a honing machine (not shown) and is rotated and driven up and down, and has eight split grooves 2a extending in the axial direction. And a grinding wheel holder 3 for roughing and a grinding wheel holder 4 for finishing, which are respectively slidably supported in the radial direction with respect to the axis of the body 2. It holds a grindstone 5 and a finishing grindstone 6, respectively.

In the center of the honing head 1, a grinding wheel expansion sleeve 7 and a grinding wheel expansion rod 8 which are fitted to each other and which are independently driven by hydraulic cylinders (not shown) as expanding means are concentrically arranged. It is supported so as to be able to move up and down. Here, two finishing processes are provided at the lower end portion of the grinding wheel expansion sleeve 7 at positions where they come into sliding contact with the tapered portions 4a provided at two locations inside the finishing grinding wheel holder 4. A grinding wheel expansion cone 9 is integrally fixed, and a lower end of the grinding wheel expansion rod 8 is provided with a finishing grinding wheel holder 4 inside the rough grinding wheel holder 3.
Two roughing grindstone expanding cones 10 are integrally fixed at positions where they are in sliding contact with the tapered portions 3a provided at two locations vertically displaced from the tapered portion 4a.

On the outer surfaces of the upper end portions of the roughing grindstone holder 3 and the finishing grindstone holder 4, spring engaging grooves 3b extending in the circumferential direction of the body 2 are provided, respectively.
4b are formed inward in the radial direction, and spring engaging grooves 3c extending in the circumferential direction of the body 2 are also provided on the outer surfaces of the lower end portions of the grinding wheel holder 3 and the finishing wheel holder 4, respectively. 4c are formed radially inward, and their spring engaging grooves 3b, 4b and 3c, 4c
Inside, the grindstone holder 3 for rough machining and the grindstone holder 4 for finish machining are constantly urged inward in the radial direction, respectively, so that the sliding contact between the tapered portion 4a and the grindstone expanding cone 9 and the tapered portion 3a and the grindstone expanding are performed. Annular coil springs 11 and 12 as elastic members for securing sliding contact with the cone 10 are stretched.

In such a honing head 1, as shown in FIG.
After being inserted into the cylinder bore 14 of the
Is lowered with respect to the body 2 based on the operation of the hydraulic cylinder, the roughing grindstone expanding cone 10 fixed to the lower end thereof moves down together with the grindstone expanding rod 8, and is roughened by sliding contact with the tapered portion 3a. The grindstone holder 3 is extruded radially outward, whereby the arrangement diameter of the roughing grindstone 5 is expanded to a diameter suitable for performing rough honing on the bore surface 14a of the cylinder bore 14 where primary silicon is deposited. Is done.

When the grindstone expanding rod 8 moves up with respect to the body 2 based on the operation of the hydraulic cylinder, while the grindstone expanding sleeve 7 moves down with respect to the body 2 based on the operation of the other hydraulic cylinders, the roughing work is performed. While the grindstone holder 3 is pulled inward in the radial direction by the coil springs 11 and 12, the grindstone expansion cone 9 for finishing processing fixed to the lower end of the grindstone expansion sleeve 7 descends together with the grindstone expansion sleeve 7 to form a tapered portion 4a. The finishing grindstone holder 4 is pushed outward in the radial direction by sliding contact with the cylinder bore 14.
The diameter of the bore surface 14a on which primary silicon is deposited is expanded to a diameter suitable for performing finishing honing.

When the grinding wheel expansion sleeve 7 rises relative to the body 2 based on the operation of the other hydraulic cylinder,
The grinding wheel holder 4 for finishing is also pulled inward in the radial direction by the coil springs 11 and 12.

[0008]

However, in the above-mentioned conventional honing head 1, a coil spring is provided.
Since 11 and 12 are commonly used for retracting the grinding wheel holder 3 for roughing and for retracting the grinding wheel holder 4 for finishing,
When the finishing grinding wheel holder 4 is pushed outward in the radial direction when the finishing honing is performed on the bore surface 14a, the diameters of the coil springs 11 and 12 are expanded and the retraction force of the rough grinding wheel holder 3 is reduced. This allows the roughing grindstone holder 3 to move radially outward due to centrifugal force even though the hydraulic cylinder does not lower the roughing grindstone expanding cone 10 via the grindstone expanding rod 8. The arrangement diameter of the processing grindstone 5 is expanded, which causes the rough processing grindstone 5 to have a small bore surface 14a during the finish honing.
, The surface of the bore 14a is roughened, and the fragile primary crystal silicon deposited there is crushed, thereby deteriorating the crushing rate of the primary silicon.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a honing head which advantageously solves the above-mentioned problems, and a honing head according to the present invention comprises a primary silicon crystal of a high silicon aluminum cylinder block. On the surface of the bore on which is deposited, is used to perform rough honing and finish honing, and the arrangement diameter of the plurality of roughing grindstone holders and the plurality of finishing grindstone holders, respectively, is expanded by expansion means, In a honing head which is reduced by an elastic member stretched over the grindstone holders, an elastic member for the roughing grindstone holder and an elastic member for the finishing grindstone holder are separately provided as the elastic members. And, while stretching the elastic member for the roughing grindstone holder only to the roughing grindstone holder, It is characterized in that the elastic member for raising grindstone holder looped over only the finishing grindstone holder.

[0010]

In this honing head, an elastic member for the roughing grindstone holder and an elastic member for the finishing grindstone holder are separately provided, and the elastic member for the roughing grindstone holder is roughened. While hanging over only the whetstone holder,
Since the elastic member for the finishing wheel holder is hung over only the finishing wheel holder, even if the arrangement diameter of the finishing wheel holder is expanded by the expansion means, it is not affected by the expansion. Therefore, the elastic member for the roughing grindstone holder surely maintains the arrangement diameter of the roughing grindstone holder in the reduced state even during the finishing process.

Therefore, according to the honing head of the present invention, the roughing grindstone held by the roughing grindstone holder comes into contact with the bore surface during the finish honing, and removes the fragile primary crystal silicon precipitated therefrom. Since crushing does not occur, the crushing rate of primary crystal silicon can be reduced, and high-quality finishing honing can be performed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1A is a partially cutaway front view of an embodiment of the honing head of the present invention, and FIG. 1B is a sectional view taken along line AA of the embodiment shown in FIG. It is sectional drawing, and the part similar to the prior art example in a figure is shown with the same code | symbol. That is, in the drawing, reference numeral 15 denotes the honing head of this embodiment, and the honing head 15 also has eight split grooves 2a radially arranged with respect to the axis thereof and extending in the axial direction, and a honing machine (not shown). 2 that is fixed to the main shaft and is driven to rotate and elevate
And a roughing grindstone holder 3 and a finishing grindstone holder 4 alternately arranged in the eight split grooves 2a of the body 2 and supported so as to be slidable in the radial direction with respect to the axis of the body 2. And the whetstone holders 3 and 4 are
The grindstone 5 for rough machining and the grindstone 6 for finish machining are respectively held.

The honing head 15 also has, at its center, a grinding wheel expansion sleeve 7 and a grinding wheel expansion rod 8 which are fitted with each other and which are independently driven by hydraulic cylinders (not shown) as expansion means to move up and down independently of each other. It is supported so as to be able to move up and down. Here, two finishing processes are provided at the lower end portion of the grinding wheel expansion sleeve 7 at positions where they come into sliding contact with the tapered portions 4a provided at two locations inside the finishing grinding wheel holder 4. A grinding wheel expansion cone 9 is integrally fixed, and a lower end of the grinding wheel expansion rod 8 is provided with a finishing grinding wheel holder 4 inside the rough grinding wheel holder 3.
Two roughing grindstone expanding cones 10 are integrally fixed at positions where they are in sliding contact with the tapered portions 3a provided at two locations vertically displaced from the tapered portion 4a.

The outer surfaces of the upper ends of the roughing grindstone holder 3 and the finishing grindstone holder 4 are respectively provided in two upper and lower stages in the form of spring engaging grooves 3d, 3e and 4d extending in the circumferential direction of the body 2. , 4e are formed inward in the radial direction. Here, as for the upper spring hooking grooves 3d, 4d, the spring hooking grooves 3d of the roughing grindstone holder 3 are formed by the springs of the finishing grindstone holder 4. It is made deeper than the hook groove 4d, and the spring hook grooves 3e and 4e at the lower stage are the spring hook grooves of the grinding wheel holder 4 for finishing.
4e is deeper than the spring hook groove 3e of the roughing grindstone holder 3.

The lower end of the roughing grindstone holder 3 is extended inward in the radial direction so as to have a greater thickness in the radial direction than the lower end of the finishing grindstone holder 4. On the outer surface of the lower end portion of the grindstone holder 3, a spring hook groove extending in the circumferential direction of the body 2 in two stages up and down.
3f and 3g are formed sufficiently deep inward in the radial direction, while only one step is provided on the outer surface of the lower end portion of the grinding wheel holder 4 for finishing in this case. Are formed radially inward.

Then, in the above-mentioned spring hooking grooves 3d, 4d, 3
In e, 4e, 3f, 4f, and 3g, the roughing grindstone holder 3 and the finishing grindstone holder 4 are constantly urged radially inward, respectively, so that the tapered portion 4a and the grindstone expanding cone 9 And the tapered part 3a and the grinding wheel expansion cone 10
Annular coil springs 16, 17, 18 and 19 as elastic members are secured over the coil springs 16 and 18, respectively, where the spring retaining grooves 3d and 3f are engaged with the spring retaining grooves 3d and 3f. Since they are deeper than the grooves 4d and 4f, they respectively hang on the groove bottoms of the spring holding grooves 4d and 4f of the grinding wheel holder 4 for finishing, but as shown in FIG. Grooves 3d, 3f
, And constantly presses only the finishing grinding wheel holder 4 inward in the radial direction.

On the other hand, the coil spring 17 has a depth that the spring engaging groove 4e is deeper than the spring engaging groove 3e.
As shown in FIG. 1 (a), it is hung on the groove bottom of the spring hook groove 3 e of the roughing grindstone holder 3, but floats from the groove bottom of the spring hook groove 4 e of the finishing grindstone holder 4, and is roughened. Only the whetstone holder 3 is constantly pressed inward in the radial direction, and the coil spring 19 also has a spring engaging groove 3g of the roughing whetstone holder 3, as shown in FIG.
And freely passes through the inside of the lower end of the grinding wheel holder 4 for finishing work, and constantly presses only the rough grinding wheel holder 3 inward in the radial direction.

In the honing head 15, as shown in FIG. 2, a high silicon aluminum cylinder block 13 is provided.
After being inserted into the cylinder bore 14 of the
Is lowered with respect to the body 2 based on the operation of the hydraulic cylinder, the roughing grindstone expanding cone 10 fixed to the lower end thereof moves down together with the grindstone expanding rod 8, and is roughened by sliding contact with the tapered portion 3a. The grindstone holder 3 is extruded radially outward, whereby the arrangement diameter of the roughing grindstone 5 is expanded to a diameter suitable for performing rough honing on the bore surface 14a of the cylinder bore 14 where primary silicon is deposited. Is done.

When the whetstone expanding rod 8 is raised with respect to the body 2 based on the operation of the hydraulic cylinder, while the whetstone expanding sleeve 7 is lowered with respect to the body 2 based on the operation of the other hydraulic cylinders, the roughing work is performed. The grindstone holder 3 is drawn inward in the radial direction by the coil springs 17 and 19, while the finishing grindstone expansion cone 9 fixed to the lower end of the grindstone expansion sleeve 7 descends together with the grindstone expansion sleeve 7 to form the tapered portion 4a. The finishing grindstone holder 4 is pushed outward in the radial direction by sliding contact with the cylinder bore 14.
The diameter of the bore surface 14a on which primary silicon is deposited is expanded to a diameter suitable for performing finishing honing.

When the whetstone expanding sleeve 7 is raised with respect to the body 2 based on the operation of the other hydraulic cylinder,
The grinding wheel holder 4 for finishing is also pulled inward in the radial direction by the coil springs 16 and 18.

In addition, in the honing head 15 of this embodiment, the roughing grindstone holder 3 and thus the coil springs 17 and 19 for the roughing grindstone 5 and the finishing grindstone holder 4 and thus the finishing grindstone 6 And the coil springs 16 and 18 are separately provided to separately bias the grindstone holder inward in the radial direction. Therefore, even if the arrangement diameter of the finishing grindstone 6 is expanded by the hydraulic cylinder, the expansion is not performed. The diameter reduction function of the coil springs 17 and 19 for the rough grinding wheel 5 does not decrease due to the influence, and therefore the coil springs 17 and 19 for the rough grinding wheel 5 are arranged in the rough grinding wheel 5 even during the finishing processing. Ensure that the diameter is kept reduced.

Therefore, according to the honing head 15 of this embodiment, the roughing grindstone 5 comes into contact with the bore surface 14a during the finish honing, and crushes the fragile primary crystal silicon deposited thereon. 30
%, The crushing rate of primary crystal silicon can be reduced to 10% or less, and high quality finishing honing can be performed.

Although the present invention has been described with reference to the illustrated examples, the present invention is not limited to the above-described examples. For example, the elastic member may be made of a rubber-like elastic material such as an O-ring. The direction can also be appropriately changed as long as the elastic member can function independently.

[0024]

As described above, according to the honing head of the present invention, the rough grinding wheel held by the rough grinding wheel holder comes into contact with the surface of the bore during the finish honing process, and the fragile primary crystal precipitated there. Since there is no crushing of silicon, the crushing rate of primary silicon can be reduced,
High quality finishing honing can be performed.

[Brief description of the drawings]

FIG. 1 (a) is a front view showing one embodiment of a honing head of the present invention with a part cut away, and FIG.
It is sectional drawing which follows the AA of the Example shown to (a).

FIG. 2 is an explanatory diagram showing an operation state of the honing head of the embodiment.

FIG. 3A is a front view showing a conventional honing head partially cut away, and FIG. 3B is a cross-sectional view taken along line BB of the conventional example shown in FIG.

FIG. 4 is an explanatory view showing an operation state of the conventional honing head.

[Explanation of symbols]

 2 Body 3 Whetstone holder for roughing 4 Whetstone holder for finishing 5 Roughing stone 6 Roughing stone 13 High silicon aluminum cylinder block 14 Cylinder bore 14a Bore surface 15 Honing head 16, 18 Coil spring for finishing whetstone 17, 19 Coil spring for roughing whetstone

Claims (1)

(57) [Claims] 1. A high-silicon aluminum cylinder block (13), used to apply a rough honing and finish honing the bore surface (14a) of the primary crystal silicon is deposited, a plurality of roughing grindstone holder (3 ) And a plurality of finishing grinding wheel holders (4) ,
While expanded by expansion means, hanging on their grindstone holder
Only honing reduced by the elastic member pass head (1
In 5), as the elastic member, the elastic member for roughing grindstone holder (17, 19), and an elastic member (16, 18) for the finishing grindstone holder, provided separately, the The elastic members (17, 19) for the roughing grindstone holder are
Hook over only the roughing whetstone holder and
Finish the elastic members (16, 18) for the grinding wheel holder for grinding
Honing head for high-silicon aluminum bores, which is hung over only the grinding wheel holder .