KR-20260067672-A - EJECTING APPARATUS FOR HEAT RESISTING SMALL-DIAMETER STEEL TUBE

KR20260067672AKR 20260067672 AKR20260067672 AKR 20260067672AKR-20260067672-A

Abstract

The present invention relates to an ejection device for small-diameter heat-resistant steel tubes, and in particular, by including an expansion clamping part composed of a plurality of clamping members that are each separated from a central axis and move the same distance in the radial direction, a base plate on which the expansion clamping part is installed, and a guide plate coupled to one surface of the base plate to form a guide space between the base plate and the expansion clamping part to guide the movement of the expansion clamping part, the invention provides the advantage of preventing damage to the cast product to prevent product quality degradation and ensuring stability during the ejection operation of the cast product from the mold.

Inventors

이정호
정우용
최주현

Assignees

부공산업 주식회사

Dates

Publication Date: 20260513
Application Date: 20241106

Claims (10)

An extended clamping section composed of multiple clamping members that are separated from the central axis and move the same distance in the radial direction; A base plate on which the above-mentioned expansion clamping part is installed; and A guide plate coupled to one surface of the base plate to form a guide space for guiding the movement of the expansion clamping part between the base plate and the base plate; The above-mentioned expansion clamping part is, A guide flange that moves in the radial direction within the guide space, and is prevented from deviating in the central axis direction by the guide plate; and An extraction device for a small diameter heat-resistant steel tube, comprising: an inner clamping end formed to extend longitudinally along the central axis from the guide flange.
In claim 1, The above-described expansion clamping part further comprises a connecting part that connects the guide flange and the inner clamping end, wherein the outer diameter of the plurality of clamping members is formed in a shape in which the outer diameter is gradually reduced from the guide flange to the inner clamping end; a device for extracting a small-diameter heat-resistant steel tube.
In claim 2, The above-described expansion clamping part further comprises a press-fit hole formed to insert an operating rod of a predetermined outer diameter that reciprocates along the central axis to move the plurality of clamping members in a radial direction.
In claim 3, A device for extracting small-diameter heat-resistant steel tubes, wherein the above-mentioned insertion hole is formed such that the inner diameter of the inlet portion formed before the plurality of clamping members move in the radial direction is larger than the outer diameter of the operating rod, and has a cone-shaped cross-section in which the inner diameter gradually decreases toward the inner clamping end.
In claim 3, A device for extracting a small-diameter heat-resistant steel tube, wherein the above-described operating rod is configured to reciprocate only within the range where at least the tip portion contacts between one end and the other end of the press-fit hole.
In claim 1, A device for extracting small-diameter heat-resistant steel tubes, wherein an uneven surface is machined and formed on the outer surface of the inner clamping section to increase frictional force against the inner surface of the cast product.
In claim 1, In the guide plate, the inner clamping end of the expansion clamping part is extended and exposed, and a detachment prevention end is further formed in the form of a hole to prevent external detachment of the guide flange. A device for extracting small-diameter heat-resistant steel tubes, wherein the inner diameter of the above-mentioned anti-detachment is formed to be smaller than the outer diameter of the above-mentioned guide flange before the above-mentioned plurality of clamping members are moved in the radial direction.
In claim 3, A device for extracting a small-diameter heat-resistant steel tube, wherein the above-mentioned expansion clamping member further comprises a moving restoring member interposed to surround the outer surface of the connecting member among the plurality of clamping members.
In claim 8, The above moving restoration member is made of a steel wire coil capable of elastic restoration, and when the insertion force for the press-fit hole by the above operating rod is released, the plurality of clamping members are elastically restored moving in the radial direction toward the central axis, a device for extracting a small diameter heat-resistant steel tube.
In claim 3, A device for extracting small-diameter heat-resistant steel tubes, further comprising: a guide boss portion connected to the base plate and guiding the reciprocating movement of the operating rod.

Description

Ejecting apparatus for heat-resisting small-diameter steel tubes The present invention relates to an ejection device for small-diameter heat-resistant steel tubes, and more specifically, to an ejection device for small-diameter heat-resistant steel tubes that can be universally used for tubes corresponding to various diameters and can stably eject high-temperature tube products. Generally, centrifugal casting is a method for producing tube-shaped cast products by rotating a cylindrical mold in one direction at low or high speeds and solidifying the molten metal injected into the mold. Before injecting molten metal into the mold to produce cast products, a release agent is applied to the inside of the mold to extend the mold's lifespan and improve the workability of the casting process. After a release agent is applied to the inner surface of the mold, molten metal is injected into the mold, and a cast product is manufactured by the unidirectional rotation of the mold, and the cast product is ejected along the axial direction of the mold. Figure 1 is a photograph showing a conventional casting product extraction device. A casting product extraction device (1) according to the prior art includes, as shown in FIG. 1, an extraction body (10) fixed to a transfer device not shown via a mounting end (11), and a pair of swing clamps (15) that are exposed while swinging outward from the extraction body (10) based on a rotation point (not shown) inside the extraction body (10). Here, a pair of swing clampers (15) are provided to swing pivotally with respect to the aforementioned pivot point by means of a clamper rod (not shown) that reciprocates inside the extraction body (10). The process of removing a cast product from a mold using a cast product removal device (1) according to the prior art is as follows. First, when the tube-shaped casting product is hardened by the centrifugal casting method, the extraction body (10) is pushed into the hollow interior of the casting product using a transfer device. Then, using a clamper rod, the outer ends of a pair of swing clampers (15) are each swung and rotated so that they come into close contact with the hollow inner surface of the cast product, thereby firmly clamping the cast product, and then the transfer device is operated to remove the cast product from the outside of the mold. However, the process of extracting a cast product using a cast product extraction device (1) according to the prior art as described above has the following problems. First, in order to easily remove the cast product from the mold, rotational force must be applied such that the ends of a pair of swing clampers (15) are each pressed against the inner surface of the cast product to some extent, which may cause damage to the inside of the cast product. Second, since the end portion of a pair of swing clampers (15) for clamping the cast product from the inside must swing to expand by at least the inner diameter of the cast product, the diameter of the extraction body (10) must be manufactured to be as small as possible, which is a problem that hinders the variety of product specification expansion designs. Figure 1 is a photograph showing a conventional casting product extraction device, and FIG. 2 is a perspective view showing an extraction device for a small-diameter heat-resistant steel tube according to one embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIGS. 4a and 4b are perspective views before and after operation to explain the operation before and after for ejecting a cast product, and FIGS. 5A and 5B are cutaway perspective views taken along line AA of FIG. 2, which are cross-sectional views of FIG. 4A and 4B before and after operation, and FIG. 6 is an exploded perspective view of FIG. 3, showing the replacement of an extension clamping part of various specifications, and FIGS. 7a to 7d are ejection process diagrams for explaining the ejection from a mold using an ejection device for a small-diameter heat-resistant steel tube according to one embodiment of the present invention. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the