JPH0796425A - Press-in device for cylindrical core - Google Patents

Abstract

PURPOSE:To automatically match an outer cylinder to the center of a pan (press-fitting center) even when the outer cylinder has a dimensional error within an allowable range. CONSTITUTION:In a press-fitting device of a cylindrical core, an outer cylinder 2 is placed in a circular recessed part provided in the center of a pan 1 and a cylindrical core is pressed in an external cylinder 1, an aligning mechanism to match the center of the placed outer cylinder 2 in the center of the recessed part on at least three points along the recessed part circumferential direction of the pan of the outer cylinder 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a press-fitting device for a cylindrical core,
Particularly, the present invention relates to a press-fitting device for pushing a cylindrical honeycomb core into an outer cylinder when producing a cylindrical honeycomb structure used as a catalyst converter carrier for automobiles.

[0002]

2. Description of the Related Art When manufacturing a cylindrical honeycomb structure,
It is necessary to insert a honeycomb core formed by spirally winding a flat foil and a corrugated foil into an outer cylinder that serves as a cover.
Since the outer diameter of this honeycomb core is made slightly larger than the inner diameter of the outer cylinder, it is required to push the core into the outer cylinder by using a dedicated press-fitting device.

As this type of press-fitting device, for example, one having a structure of Japanese Patent Laid-Open No. 4-371236 is known. In this press-fitting device, a honeycomb core is held and positioned by a rotary gripping mechanism from above with respect to an outer cylinder standing by on a tray, and then the core is pressed and inserted by a press-fitting head.

[0004]

The outer cylinder, into which the core is press-fitted by the above-mentioned press-fitting device, is premised to have good dimensional accuracy so that it can be placed in a predetermined position only by being placed on the tray. Was there. However, in order to achieve the strict dimensional accuracy, the manufacturing process has been complicated, which requires a great deal of cost. After that, when the outer cylinder cost reduction is required due to the miniaturization of the vehicle displacement to be used as a catalytic converter for automobiles, it is inevitable that the conventional manufacturing process will be further simplified, and the outer cylinder inevitably has a dimensional accuracy. descend.

As a result, the positional relationship between the outer cylinder and the core is not fixed, and relative positional deviation occurs, which may cause damage to the core during press fitting. This will be described with reference to the drawings. As shown in FIGS. 2A and 2B, a recess 1a for mounting the outer cylinder 2 with its axis vertical is formed in the tray 1. Since the diameter is made assuming the maximum size of the dimensions in the manufacturing process of the outer cylinder, depending on the outer cylinder, the outer diameter of the outer cylinder is smaller than the recess diameter as shown in the figure, and the center of the outer cylinder 2 and the recess The center of 1a may shift. At the time of press-fitting in such a case, as shown in FIG. 3, the core 3 and the outer cylinder 2 are press-fitted with their centers displaced from each other, resulting in partial interference and damage to the core at that location. It is rejected as a product.

According to the present invention, even with such an outer cylinder having a low dimensional accuracy (of course, even in such a case, the outer cylinder is within an allowable dimensional range), the centering with the core is easy and the cost is lower than that of the conventional apparatus. It is an object of the present invention to provide a press-fitting device that can be completed.

[0007]

The gist of the present invention is to provide a cylindrical core press-fitting device in which an outer cylinder is placed in a circular recess provided in the center of a tray and a cylindrical core is press-fitted into the outer cylinder. The cylindrical core press-fitting device is characterized in that an aligning mechanism for aligning the center of the placed outer cylinder with the center of the recess is provided at least at three locations along the circumferential direction of the recess of the outer cylinder tray. As the above-mentioned centering mechanism, it is preferable to use a pusher that elastically projects from the recess wall of the tray toward the center.

[0008]

If an outer cylinder having an outer diameter smaller than the diameter of the recess is inserted into the recess of the tray, even if the position of the outer cylinder is initially deviated, the outer cylinder can be moved by any of the aligning mechanisms such as pushers in three directions. When pushed, the outer cylinder is automatically centered in the center of the recess of the tray.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. As shown in FIG. 1, a circular recess 1a for directly accommodating the outer cylinder is formed substantially in the center of the disk-shaped tray 1 on which the outer cylinder is placed. The diameter of the recess 1a corresponds to the maximum allowable diameter of the outer cylinder to be stored. Three aligning mechanisms are provided in the wall portion of the tray 1 which forms the concave portion 1a. These three alignment mechanisms are shown in Fig. 1.
As shown in (b), it is evenly spaced (120
It is arranged so as to press the outer cylinder in the radial direction over a certain range at a position of (°).

The illustrated aligning mechanism comprises a pusher pin 4 which is inserted into the wall of the tray 1 so that its tip projects from the wall surface of the recess, and a spring 5 which holds the pusher pin 4 with a constant force. It The tip of the pusher pin 4 has a spherical shape or a tapered shape, and the spring 5 is, for example, a coil spring or a leaf spring. The pusher pins 4 are pressed toward the center of the tray 1 with the same constant pressing force. I'm trying to press. That is, the spring constants of the springs 5 may be the same. Further, at least three aligning mechanisms are required, and the number may be increased depending on the increase in the outer cylinder diameter, but three is sufficient for practical use.

For example, as shown in FIG. 1, the recess 1 of the tray 1
When the outer cylinder 2 having a diameter smaller than the diameter of a is placed in the recess,
Initially, the outer cylinder 2 which is inserted with a bias as shown in FIG. 2 is pushed by the pusher pin 4 on the side where the gap with the recess wall is narrow, and is positioned at the center of the recess (press-fitting central axis). Therefore, even if there is a variation in the outer diameter of the outer cylinder, the outer cylinder is automatically aligned before the core is press-fitted. After the centering is completed, the core is axially press-fitted into the outer cylinder by using the press-fitting mechanism.

[0012]

As described above, according to the press-fitting device of the present invention, the center of the outer cylinder can be automatically adjusted to the center of the pan (press-fitting center) without providing any actuation mechanism, and a high level is achieved. Introducing the technology of the present invention into the conventional press-fitting device field, in which the accuracy of manufacturing the outer cylinder is required, the accuracy of manufacturing the outer cylinder can be relaxed, and the cost of the outer cylinder can be significantly reduced. .

[Brief description of drawings]

1A is a cross-sectional view showing an embodiment of a press-fitting device of the present invention, and FIG. 1B is a plan view of FIG.

FIG. 2A is a cross-sectional view showing an example of a conventional press-fitting device,
(B) is a plan view of (a).

FIG. 3 is a cross-sectional view showing a press-fitted state by a conventional press-fitting device.

[Explanation of symbols]

 1 saucer 1a saucer recess 2 outer cylinder 3 core 4 pusher pin 5 spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Utsumi 2-6-3 Otemachi, Chiyoda-ku, Tokyo Shin Nippon Steel Co., Ltd.

Claims (2)

[Claims] 1. A cylindrical core press-fitting device in which an outer cylinder is placed in a circular recess provided in the center of a pan, and a cylindrical core is press-fit into the outer cylinder, in a circumferential direction of the recess of the outer cylinder pan. A press-fitting device for a cylindrical core, wherein an aligning mechanism for aligning the center of the mounted outer cylinder with the center of the recess is provided at at least three points along the center. 2. The press-fitting device according to claim 1, wherein the centering mechanism is a pusher elastically protruding from the recess wall toward the center.