JPH05318309A - Honing head for high silicon aluminum bore - Google Patents

Abstract

PURPOSE:To prevent that a coarse working hone stick is brought into with a bore surface to crush breakable primary crystal silicon deposited thereon in finishing honing work so as to decrease breakage rate of the primary crystal silicon. CONSTITUTION:This device is used for applying coarse honing work and finishing honing work to a bore surface of a high silicon aluminum cylinder block, on which primary clistal silicon is deposited. Arranging diameters for coarse working sticks 5 and finishing working sticks 6 are respectively expanded by an expanding means and meanwhile contracted by elastic members. Elastic members 17, 19 for coarse working sticks 5 and elastic members 16, 18 for finishing working sticks 6 are separately provided as elastic members, and these can independently function.

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 with a high silicon content, which is used for omitting a cylinder liner for the purpose of weight reduction and size reduction of an engine, and a bore in which primary crystal silicon is deposited. 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 Conventionally, as a honing head as described above, there is a honing head shown in FIG. 3 (a) and 3 (b) with reference numeral 1. The honing head 1 is arranged radially with respect to its axis. And a body 2 which has eight dividing grooves 2a extending in the axial direction and which is fixedly attached to a main shaft of a honing machine (not shown) to be driven to rotate and ascend / descend, and the two dividing grooves 2a of the body 2 are alternately arranged. A grinding wheel holder 3 for rough machining and a grinding wheel holder 4 for finishing, which are slidably supported in the radial direction with respect to the axis of the body 2, and these grinding wheel holders 3 and 4 are for rough machining. The grindstone 5 and the finishing grindstone 6 are respectively held.

Further, the honing head 1 is concentrically provided at its center with a grindstone expansion sleeve 7 and a grindstone expansion rod 8 which are fitted to each other and are respectively 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, at the lower end portion of the grindstone expansion sleeve 7, two finishing processes are carried out at positions where they are slidably contacted with the taper parts 4a provided at two positions inside the finishing process grindstone holder 4, respectively. The whetstone expansion cone 9 is integrally fixed, and the whetstone expansion rod 8 has a lower end portion at which a finishing whetstone holder 4 inside the roughing whetstone holder 3 is provided.
Two roughening-grinding stone expansion cones 10 are integrally fixed at the positions slidingly contacting the tapered portions 3a provided at two positions vertically displaced from the tapered portion 4a.

Spring-grooving grooves 3b extending in the circumferential direction of the body 2 are provided on the outer surfaces of the upper ends of the roughing grindstone holder 3 and the finishing grindstone holder 4, respectively.
4b is formed inward in the radial direction, and the spring engaging grooves 3c extending in the circumferential direction of the body 2 are also formed on the outer surfaces of the lower ends of the roughing grinding wheel holder 3 and the finishing grinding wheel holder 4, respectively. 4c are formed inward in the radial direction, and their spring hook grooves 3b, 4b and 3c, 4c are formed.
Inside, the roughing grindstone holder 3 and the finishing grindstone holder 4 are constantly urged inward in the radial direction, respectively, to make sliding contact between the taper portion 4a and the grindstone expansion cone 9 and the taper portion 3a and grindstone expansion. Annular coil springs 11 and 12 as elastic members are secured so as to ensure sliding contact with the cone 10.

In such a honing head 1, as shown in FIG. 4, a high silicon aluminum cylinder block 13 is provided.
After being inserted into the cylinder bore 14 of the
When the tool lowers with respect to the body 2 due to the operation of the hydraulic cylinder, the roughing grinding wheel expansion cone 10 fixed to the lower end thereof moves down together with the grinding wheel expansion rod 8, and the roughing is performed by sliding contact with the taper portion 3a. The grindstone holder 3 is pushed outward in the radial direction, whereby the diameter of the roughing grindstone 5 is increased to a diameter suitable for rough honing on the bore surface 14a of the cylinder bore 14 where the primary silicon is deposited. To be done.

Further, when the grindstone expansion rod 8 is raised with respect to the body 2 by the operation of the hydraulic cylinder, and the grindstone extension sleeve 7 is lowered with respect to the body 2 by the operation of the other hydraulic cylinder, for rough machining. While the grindstone holder 3 is pulled inward in the radial direction by the coil springs 11 and 12, 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 taper portion 4a. The grinding wheel holder 4 for finishing is pushed outward in the radial direction by sliding contact with the grinding wheel 4, so that the diameter of the grinding wheel 6 for finishing is arranged in the cylinder bore 14 described above.
The bore surface 14a on which the primary crystal silicon is deposited is expanded to a diameter suitable for finishing honing.

When the grindstone expansion sleeve 7 is raised with respect to the body 2 by 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 conventional honing head 1 described above, the coil spring is used.
Since 11 and 12 are commonly used for drawing in the roughing grinding wheel holder 3 and drawing in the finishing grinding wheel holder 4,
When the finishing grindstone holder 4 is pushed outward in the radial direction when the finish honing is performed on the bore surface 14a, the diameters of the coil springs 11 and 12 are expanded and the pulling force of the roughing grindstone holder 3 is weakened. As a result, even though the hydraulic cylinder does not lower the roughing-grinding stone expansion cone 10 via the grindstone-extending rod 8, the roughing-grinding stone holder 3 moves outward in the radial direction by centrifugal force, and The arrangement diameter of the grindstone 5 for machining is expanded, and as a result, the grindstone 5 for rough machining is slightly bore surface 14a during finishing honing.
However, there is a problem in that the surface 14a of the bore is roughened by contact with the crushed primary surface and the fragile primary crystal silicon deposited there is crushed to deteriorate the crushing rate of the primary crystal silicon.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a honing head that advantageously solves the problems of the conventional honing heads described above. The honing head of the present invention is made of high silicon aluminum. Used to perform rough honing and finishing honing on the bore surface of the cylinder block where primary crystallized silicon is deposited. The elastic member for the roughing grindstone and the elastic member for the finishing grindstone are separately provided as the elastic member.

[0010]

In this honing head, since the elastic member for the roughing grindstone and the elastic member for the finishing grindstone are separately provided, the arrangement diameter of the finishing grindstone is expanded by the expanding means. Even if the expansion is performed, the diameter reduction function of the elastic member for the roughing grindstone does not deteriorate due to the effect of expansion, and therefore the elastic member for the roughing grindstone ensures the arrangement diameter of the roughing grindstone even during the finishing process. Keep it in a reduced state.

Therefore, according to the honing head of the present invention, the roughing grindstone does not come into contact with the surface of the bore during the finishing honing, and the fragile primary crystal silicon deposited there is not crushed. 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. 1 (a) is a front view showing an embodiment of the honing head of the present invention with a part cut away, and FIG. 1 (b) is taken along the line AA of the embodiment shown in FIG. 1 (a). It is a cross-sectional view, and the same parts as those in the conventional example are denoted by the same reference numerals. That is, reference numeral 15 in the figure shows a honing head of this embodiment, and this honing head 15 also has eight dividing grooves 2a radially arranged with respect to its axis and extending in the axial direction, and a honing machine not shown. Body 2 that is fixed to the main shaft of the machine and is driven to rotate and move up and down
And a grindstone holder 3 for rough machining and a grindstone holder 4 for finishing, which are alternately arranged in the above-mentioned eight split grooves 2a of the body 2 and supported slidably in the radial direction with respect to the axis of the body 2. And the whetstone holders 3 and 4 are
It holds a roughing grindstone 5 and a finishing grindstone 6, respectively.

Also, the honing head 15 is concentrically provided at its center with a grindstone expansion sleeve 7 and a grindstone expansion rod 8 which are fitted to each other and are respectively 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, at the lower end portion of the grindstone expansion sleeve 7, two finishing processes are carried out at positions where they are slidably contacted with the taper parts 4a provided at two positions inside the finishing process grindstone holder 4, respectively. The whetstone expansion cone 9 is integrally fixed, and the whetstone expansion rod 8 has a lower end portion at which a finishing whetstone holder 4 inside the roughing whetstone holder 3 is provided.
Two roughening-grinding stone expansion cones 10 are integrally fixed at the positions slidingly contacting the tapered portions 3a provided at two positions vertically displaced from the tapered portion 4a.

Therefore, the spring engaging grooves 3d, 3e and 4d extending in the circumferential direction of the body 2 are vertically arranged in two steps on the outer surfaces of the upper ends of the roughing grindstone holder 3 and the finishing grindstone holder 4, respectively. , 4e are formed inward in the radial direction. Here, regarding the spring engaging grooves 3d, 4d in the upper stage, the spring engaging groove 3d of the roughing grinding wheel holder 3 is the spring of the finishing grinding wheel holder 4. It is deeper than the hanging groove 4d, and the spring hanging grooves 3e and 4e on the lower stage are spring hanging grooves of the grinding wheel holder 4 for finishing.
4e is deeper than the spring engaging groove 3e of the roughing grindstone holder 3.

Further, the lower end of the grindstone holder 3 for rough machining here is extended radially inward so as to have a thickness in the radial direction more than the lower end of the grindstone holder 4 for finish machining. On the outer surface of the lower end of the grindstone holder 3, there are spring hooking grooves extending in the circumferential direction of the body 2.
3f, 3g are formed deep enough toward the inner side in the radial direction, while only one step is provided on the outer surface of the lower end of the grinding wheel holder 4 for finishing there, and a spring hooking groove 4f extending in the circumferential direction of the body 2 is provided. Are formed inward in the radial direction.

Then, in the spring engaging 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, and the taper portion 4a and the grindstone expansion cone 9 are provided. Sliding contact with and taper part 3a and grindstone expansion cone 10
Ring-shaped coil springs 16, 17, 18 and 19 as elastic members for ensuring sliding contact with the coil springs 16 and 18, respectively, are provided in the coil springs 16 and 18 so that the spring hook grooves 3d and 3f are hooked. Since it is deeper than the grooves 4d and 4f, the spring hooks 4d and 4f of the grindstone holder 4 for finishing are hooked on the groove bottoms, respectively, but as shown in FIG. Grooves 3d, 3f
It floats from the groove bottom and constantly presses only the finishing grindstone holder 4 radially inward.

On the other hand, in the coil spring 17, since the spring hooking groove 4e is deeper than the spring hooking groove 3e,
As shown in FIG. 1 (a), it is applied to the groove bottom of the spring engaging groove 3e of the roughing grindstone holder 3, but floats from the groove bottom of the spring engaging groove 4e of the finishing grindstone holder 4 for rough machining. Only the grindstone holder 3 is constantly pressed inward in the radial direction, and the coil spring 19 also has a spring hooking groove 3g of the roughing grindstone holder 3 as shown in FIG. 1B.
It freely passes through the inside of the lower end portion of the finishing grindstone holder 4 by hanging on the groove bottom of the groove, and only the roughing grindstone holder 3 is constantly pressed inward in the radial direction.

In such a 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
When the tool lowers with respect to the body 2 due to the operation of the hydraulic cylinder, the roughing grinding wheel expansion cone 10 fixed to the lower end thereof moves down together with the grinding wheel expansion rod 8, and the roughing is performed by sliding contact with the taper portion 3a. The grindstone holder 3 is pushed outward in the radial direction, whereby the diameter of the roughing grindstone 5 is increased to a diameter suitable for rough honing on the bore surface 14a of the cylinder bore 14 where the primary silicon is deposited. To be done.

Further, when the grindstone expansion rod 8 is raised with respect to the body 2 by the operation of the hydraulic cylinder, and the grindstone extension sleeve 7 is lowered with respect to the body 2 by the operation of the other hydraulic cylinder, for roughing. While the grindstone holder 3 is pulled inward by the coil springs 17 and 19 in the radial direction, the finish-processing 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 taper portion 4a. The grinding wheel holder 4 for finishing is pushed outward in the radial direction by sliding contact with the grinding wheel 4, so that the diameter of the grinding wheel 6 for finishing is arranged in the cylinder bore 14 described above.
The bore surface 14a on which the primary crystal silicon is deposited is expanded to a diameter suitable for finishing honing.

Then, when the grindstone expansion sleeve 7 is raised with respect to the body 2 by 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.

Further, in the honing head 15 of this embodiment, the coil springs 17 and 19 for the roughing grindstone holder 3 and thus the roughing grindstone 5, and the finishing grindstone holder 4 and thus the finishing grindstone 6 are used. Since the coil springs 16 and 18 are separately provided to bias the grindstone holder inward in the radial direction, even if the arrangement diameter of the finishing grindstone 6 is expanded by the hydraulic cylinder, the expansion of the expansion can be prevented. The diameter reduction function of the coil springs 17 and 19 for the roughing grindstone 5 does not deteriorate due to the influence, and therefore the coil springs 17 and 19 for the roughing grindstone 5 are arranged in the roughing grindstone 5 even during the finishing process. Be sure to keep the diameter in a reduced state.

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 the fragile primary crystal silicon deposited there is crushed. Since it never happens,
%, 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 above based on the illustrated example, the present invention is not limited to the above-mentioned example, and the elastic member may be made of a rubber-like elastic body such as an O-ring, and it can be stretched. On the other hand, if the elastic member can function independently, it can be appropriately changed.

[0024]

As described above, according to the honing head of the present invention, the roughing grindstone comes into contact with the surface of the bore during the finish honing, and the fragile primary crystal silicon deposited there is crushed. Since it does not exist, the crushing rate of the primary crystal silicon can be reduced, and high quality finishing honing can be performed.

[Brief description of drawings]

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

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

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

FIG. 4 is an explanatory diagram showing an operating state of the conventional honing head.

[Explanation of symbols]

 2 Hoddy 3 Grinding stone holder for roughing 4 Grinding stone holder for finishing 5 Grinding stone for roughing 6 Grinding stone for finishing 13 High silicon aluminum cylinder block 14 Cylinder bore 14a Bore surface 15 Honing head 16, 18 Coil spring for grinding stone for finishing 17, 19 Coil spring for grinding wheel for rough machining

Claims (1)

[Claims] 1. A bore surface (14a) of a high silicon aluminum cylinder block (13) in which primary silicon is deposited,
A honing head (15) which is used for performing rough honing and finish honing and expands the arrangement diameters of the roughing grinding stone (5) and the finishing grinding stone (6) by expanding means, respectively, while reducing them by elastic members. ), The elastic members (17, 19) for the roughing grindstone and the elastic member (1 for the finishing grindstone) as the elastic member.
6 and 18) and honing head for high silicon aluminum bores, which are provided separately.