JP2002361535A - Method and device for clamping thin-walled cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for clamping a thin-walled cylinder in which the thin-walled cylinder can be firmly clamped without deformation. SOLUTION: Clamp bases 7 and 8 reciprocating in an approaching/retracting manner from both sides are provided on a side wall of the thin-walled cylinder 1, pins 9, 10, 11 and 12 are provided on a plurality of parts of each clamp base, and clamping members 3, 4, 5 and 6 which are turnably engaged around the pins and abutted on two parts on the circumference of the side wall of the thin-walled cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for grasping a thin cylinder of a raw material when manufacturing a cylinder liner of an internal combustion engine.

[0002]

2. Description of the Prior Art FIG.
0 is a plan view. The grasping device 200 is provided with clamp tables 90 and 91 which approach and separate from the left and right of the thin cylinder 96 by an air cylinder (not shown). The clamp base 90 is provided integrally with contact portions 92 and 93 for contacting the thin cylinder 96. Similarly, the clamp base 91 is also provided on the thin cylinder 9.
6 are provided integrally with contact portions 94 and 95 for contacting the same.

When grasping a thin cylinder, an air cylinder (not shown) presses the clamp tables 90 and 91 with a load P. Each contact part 92-95 is

(Equation 1) The thin cylinder 96 is pressed toward the center by the force of. The time determination apparatus 200, since the pressing and holding the thin cylinder 96 in four positions on the circumference, the load P _A per point becomes larger, thin cylindrical 96 easily deformed. Therefore, it is difficult to finish according to the specified dimensional tolerance.

In the conventional gripping device 200, when a gripping force exceeding a load P = 100 kg is applied by an air cylinder,
Conventionally, since the thin cylinder 96 is deformed, honing processing or the like is conventionally performed by lowering the flange of the thin cylinder 96 (the collar of the cylinder liner of the internal combustion engine) and clamping the collar by another clamping mechanism.

In the fine boring process, it is complicated as a machining operation to grasp the cylindrical side wall portion of the thin cylinder 96 with the grasping device 200 and to fix the thin cylinder 96 by another clamping device at the time of honing.

[0006] In the honing process, a torque about 10 times as large as that in the fine boring process is generated, so that it is necessary to grasp with a correspondingly strong force. For this reason, conventionally, a clamp mechanism different from the grasping device 200 that applies a load in the vertical direction at a plurality of locations and fixes the downwardly directed collar portion is absolutely necessary.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and an apparatus for grasping a thin-walled cylinder capable of grasping strongly without deforming the thin-walled cylinder.

[0008]

According to the first aspect of the present invention, a plurality of grasping members are arranged on the circumference of a cylindrical side wall of a thin cylinder, and the grasping member is brought into contact with the cylindrical side wall. Thus, when grasping the thin cylinder, each grasping member can be brought into contact with two points on the circumference along the cylindrical side wall. According to the second aspect of the present invention, a reciprocating clamp base is provided on the cylindrical side wall of the thin-walled cylinder to approach or separate from both sides, and pins are provided at a plurality of positions of the clamp bases, respectively, so as to be rotatable about the pins. A grasping member that engages and comes into contact at two places on the circumference of the cylindrical side wall of the thin-walled cylinder is provided. According to a third aspect of the present invention, in the second aspect of the present invention, a grasping member to be engaged with the pin according to the outer diameter of the thin cylinder is replaceable.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a grasping device 100 according to the present invention which grasps a thin cylinder 1 or a grasping device 100 which grasps a thin cylinder 1 according to the present invention. FIG. 2 is a sectional view taken along the line II-II of FIG. As shown in FIG. 1, a device 1 for grasping a portion of a cylindrical side wall 2 of a thin-walled cylinder 1 having a flange 15 (outward flange) formed at an upper portion.
00 knows.

The grasping device 100 includes a clamp table 7 approaching or separating from the left of the thin cylinder 1 by a hydraulic cylinder (not shown), and a clamp table 8 approaching or separating from the right of the thin cylinder 1 by a hydraulic cylinder (not shown). It is composed of On the right side of the clamp table 7, the overhang portions 16, 1
7 is provided. On the upper portions of the overhang portions 16 and 17,
Cylindrical pins 10 and 9 are integrally fixed respectively.

The claw 4 in contact with the thin cylinder 1 has a recess 2
The claw 4 can rotate about the cylindrical pin 10 in a state where the cylindrical pin 10 is housed (engaged) in the recess 24.

However, a gap 21 is formed between the overhang portion 16 and the claw 4. When the claw 4 rotates around the cylindrical pin 10, the gap 21 becomes partially zero, and the claw 4 The rotation range is limited due to collision with the vehicle.

The claw 4 is formed with protrusions 22 and 23 extending in the same direction as the longitudinal direction of the thin cylinder 1. Projection 2
A recess 25 is formed between 2 and 23, and when the protruding portions 22 and 23 come into contact with the thin cylinder 1, a space is formed between the claw 4 and the thin cylinder 1 by the recess 25. You. By forming the two protruding portions 22 and 23 and the concave portion 25, the claw 4 can abut the thin cylinder 1 at two places.

When the protruding portions 22 and 23 come into contact with the thin cylinder 1, the protruding portions 22 and 23 of the claw 4 are moved so that the pressing force (arrow) is directed toward the center of the thin cylinder 1 as shown in FIG. It is preferable that the claws 4 are also exchanged according to the outer diameter of the thin-walled cylinder 1. For example, each time the outer diameter of the thin-walled cylinder 1 differs by 5 mm, the claw 4 also has a shape corresponding to the outer diameter of the thin-walled cylinder 1. Use those.

The pawl 3 also has the same configuration as the pawl 4, and the pawl 3 is rotatable about a cylindrical pin 9. The clamp table 8 also has the same configuration as the clamp table 7, the thin cylinder 1 is arranged between the clamp tables 7 and 8, and both clamp tables are driven by a hydraulic cylinder (not shown) to pinch (grasp) the thin cylinder 1. I do.

The claw 4 is not fixed to the cylindrical pin 10 and can be easily removed by sliding along the recess 24 with the thin cylinder 1 removed. Therefore, a suitable claw can be selected and engaged with the cylindrical pin 10 depending on the outer diameter of the thin cylinder 1 each time.

At this time, a hydraulic cylinder (not shown) presses the clamp tables 7 and 8 with a load P. Due to this load P, the protruding portion 22 or 23 moves the thin cylinder 1

(Equation 2) Is pressed in the direction of the center or substantially the center of the thin cylinder 1.

The interval between the contact portions of the projections 22 and 23 with the thin cylinder 1 and the interval between the contact portions of the adjacent nail projections with the thin cylinder 1 (for example, the projection 23 of the nail 4 and the nail It is preferable that the distance between the three protruding portions 26 abutting on the thin cylinder 1 is equal.

A comparison will be made as to how much the deformation amount of the thin cylinder differs between the present invention and the conventional one. Assuming that the deformation amount of the thin cylinder 96 by the conventional grasping device 200 is X,

(Equation 3) Becomes Here, L is a support span (interval) for grasping the thin cylinder 1, and C is a constant relating to the longitudinal elastic modulus and the second moment of area of the thin cylinder.

The amount of deformation of the thin cylinder 1 by the grasping device 100 of the present invention is represented by Y. While the conventional grasping device 200 supports the thin cylinder 96 at four locations, the grasping device 100 supports the thin cylinder 1 at eight locations,
Since the pressing load per location is halved,

(Equation 4) And Y is 1/16 of X.

As described above, even if the force P for pressing the clamp tables 7 and 8 is the same, the amount of deformation of the thin-walled cylinder 1 is reduced to 1/16 of the conventional one.
Can improve the processing accuracy of the thin-walled cylinder 1 as compared with the related art.

As in the prior art, the clamp table and the contact portions 92 to 9
5 is not formed integrally, but the claw 4 (same as the claws 3, 5, 6) is rotated around the cylindrical pin 10 in the range of the gap 21 along the outer diameter of the thin-walled cylinder 1, and the protruding portion is formed. The thin cylinder 1 is brought into contact with the cylindrical side wall 2 of the thin cylinder 1 at 22 and 23.
, A grasping force is applied in the center direction or substantially in the center direction, so that the amount of deformation of the thin cylinder 1 can be made much smaller than in the past.

The grasping device 100 can grasp the thin-walled cylinder 1 without deforming even if the grasping force is increased up to P = 1t, and can perform not only the fine boring process but also the honing process while grasping the cylindrical side wall 2. Can be continued.

[0024]

According to the first and second aspects of the present invention, the plurality of claws 3 to 6 (grasping members) can be brought into contact with the thin cylinder 1 at two places along the cylindrical side wall 2 of the thin cylinder 1. (The claw 4 is formed around the cylindrical pin 10 and the gap 21 is formed).
The contact between the contact portions of the thin-walled cylinder 1 can be reduced, and the amount of deformation of the thin-walled cylinder 1 can be reduced.

According to the third aspect of the present invention, the claw (grasping member) can be easily attached to and detached from the cylindrical pin.
By appropriately selecting a claw having a shape capable of grasping the cylinder and engaging the claw with the cylindrical pin each time, the amount of deformation when grasping the thin cylinder 1 can be reduced, and the processing accuracy can be improved. it can.

The fine boring process and the honing process for forming the hollow portion of the thin-walled cylinder 1 can be performed while the thin-walled cylinder 1 is kept in the same posture (that is, in the state grasped by the grasping device 100). Also, the work process and work time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a grasping device according to the invention of claim 2;

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a conventional grasping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thin cylinder 2 Cylindrical side wall 3-6 Claw (grasping member) 7,8 Clamp base 9-12 Cylindrical pin (pin) 15 Collar 16-19 Overhang part 21 Gap 22,23,26 Projection part 24 Recess part 25 Recess part 100 Grasping device

Claims (3)

[Claims] A plurality of grasping members are arranged on the circumference of a cylindrical side wall of a thin cylinder, and when grasping the thin cylinder by bringing the grasping member into contact with the cylindrical side wall, the grasping members are respectively formed by the grasping members. A method for grasping a thin-walled cylinder, wherein the cylinder can be brought into contact with two points on the circumference along the side wall of the cylinder. 2. A reciprocating clamp table which approaches or separates from both sides on a cylindrical side wall of a thin cylinder, pins are provided at a plurality of positions of each of the clamp tables, and the pins are rotatably engaged around the pins. And a grasping member for contacting at two places on the circumference of the cylindrical side wall of the thin cylinder. 3. The thin cylinder grasping device according to claim 2, wherein a grasping member to be engaged with the pin is replaceable in accordance with an outer diameter of the thin cylinder.