JPS644827Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a billet push rod in a billet induction heating device. In billet induction heating, in which a large number of billets are continuously pushed into an induction heating coil while maintaining contact, heated to a desired temperature within the induction heating coil, and then discharged one after another, in the final stage of continuous heating, Since there are no subsequent billets needed for pushing, pushing is no longer possible and the last billets are left in the induction heating coil. For this reason, a push rod has conventionally been used to expel the residual billet from the heating coil.

Conventionally, as this type of push rod, a carbon steel pipe for piping or a round steel bar cut to the required length, as shown in FIG. 1a, has been used. However, when such a push rod 1 is inserted into an energized heating coil in order to extrude the residual billet, an eddy current flows inside the push rod 1 under the influence of the magnetic flux generated from the heating coil, causing the push rod 1 to The temperature rises, which in turn softens. Therefore, when using this type of push rod 1, the remaining billet is discharged after the heating coil is turned off. Therefore, most of the discharged billets are not heated enough and cannot be sent to the next process such as forging, and are either disposed of or sent for reheating. For this reason, a push rod 1 with an arrow-shaped cross section at both ends as shown in Fig. 1 c and d has been devised as a load push rod for extruding while energized, but it is said that its structural strength is low and it can withstand only a few dozen heated extrusions. There are drawbacks.

The present invention was developed in order to solve these problems with conventional push rods of this type, and by making it possible to heat the billet under the same conditions up to the last billet in continuous heating of billets. ,
In addition to trying to eliminate wasteful disposal or reheating of the billet in the final stage, which is inevitable when using the conventional push rod having the structure shown in Fig. 1 a and b, the present invention also aims to eliminate the waste of billets as shown in Fig. 1 c and d. The purpose of this invention is to improve the problem that the load push rod cannot withstand long-term use due to its structure, and to provide a load push rod that is sufficiently strong and has a long life.

The present invention will be explained according to the embodiment shown in FIGS. 2a to 4b.

In Fig. 2a and 2b, 1a and 1b are metal members having a cross section of semicircular arc 21, 21', which are bent inwardly in a straight line so that their end faces face each other, and the longitudinal length is set to a required length. In a state where the bent portions 21, 21' of the metal members 1a and 1b are positioned so as to overlap each other, a plurality of bolt through holes 1ah and 1b are formed on predetermined opposing surfaces of the bent portions.
bh is drilled. 1ah is, for example, a metal member 1
The through hole formed in the bent portion 21, 21' of the metal member 1a has a thread into which the outer periphery of a bolt 31 described later can be screwed, and 1bh is a through hole formed, for example, in the bent portion 21, 21' of the metal member 1b, the inner diameter of which is set to be larger than the inner diameter of 1ah, a bushing 6 made of an electrical insulating material is provided along the inner periphery and the inner surface connected thereto, and the bolt 31 is inserted into the inner periphery of the bushing 6. The bent portions of the semicircular members 1a, 1b are opposed to each other so as to overlap with a heat-resistant electrical insulating material 4 between them. The semicircular member 1 of the heat-resistant electrical insulating material 4
The bolt through holes 4h are pre-drilled in the portions of the semicircular member 1b that correspond to the bolt through holes 1ah and 1bh. The bolt 31 is inserted into the semicircular portion of the semicircular member 1b that faces the bolt through hole 1bh.
A through hole 5 large enough to allow the insertion of a bolt tightening tool is formed.

Therefore, the bent portions 21 of the semicircular arc members 1a, 1b,
21' are faced to each other so as to overlap with each other via the heat-resistant electrical insulating material 4, and then the bent portion 2 is inserted using the through hole 5.
1, 21' and a plurality of through holes 1ah, 1bh, 4h formed to penetrate through the heat-resistant electrical insulating material 4.
By screwing the bolt 31 into the semicircular arc members 1a and 1b, the push rod 11 having a circular tubular shape is formed.

Figures 3 and 4 are the second and third diagrams of the present invention.
In the embodiment shown in FIG. 3, in place of the semicircular arc members 1a and 1b in the first embodiment, a bent portion 2 with both ends bent inward at right angles is used.
1 and 21', and in the embodiment shown in FIG. 4, a right triangular cross-sectional member 1e having bent portions 21 and 21' with both ends bent inward at an angle of 45 degrees is used. , 1f and are integrated to form the rectangular tubular push rod 12 is the first point.
Although the second embodiment is different from the first embodiment, the other configurations are the same as the first embodiment. In addition, Fig. 3 a, b and Fig. 4 a, b
In the figures, the same symbols as those shown in FIGS. 2a and b indicate the same components.

According to the present invention, the semicircular arc-shaped members 1a, 1b, the U-shaped members 1c, 1, which constitute the push rods 11, 12,
d or right triangular members 1e and 1f are electrically insulated from each other by the heat-resistant electrical insulating material 4 and the bushing 6 made of electrical insulating material, so that the members with symmetrical cross-sections, such as the right triangular members 1e and 1f, are electrically insulated from each other by the heat-resistant electrical insulating material 4 and the bushing 6 made of electrical insulating material. Even if it is inserted into the heating coil, no eddy current will flow due to the magnetic flux from the heating coil, and therefore it will not soften like in the conventional case, so the heating coil is not energized even at the final stage when the extrusion stops. While continuing, the billet remaining in the heating coil can be pushed out with the push rod according to the present invention at the same speed as in the previous pushing, and therefore all the billets can be heated completely. It is now possible to heat under the same conditions throughout the process, eliminating the waste of billet disposal and reheating that would otherwise occur with conventional methods, and improving the durability of conventional push rods under load. Its practical effects are remarkable, as it improves poor deficiencies and enables long-term use. If you want to automatically switch between pushing and feeding using the push rod of the present invention, use a known electromechanical detection mechanism to detect the stop of pushing.
The push rod may be inserted into the heating coil based on the detection signal.

[Brief explanation of drawings]

Figure 1a is a front view of a push rod used in conventional continuous heating, Figure 1b is a side view of Figure 1a, and Figure 1c is a push rod used in conventional continuous heating. A front view of another push rod, FIG. 1 d is a side view of FIG. 1 c, FIG. 2 a is a front view showing an embodiment of the present invention, and FIG. 2 b is a cross section taken along line A-A of FIG. 2 a. Fig. 3a is a front view showing the second embodiment of the present invention, Fig. 3b is a sectional view taken along line B-B of Fig. 3a, and Fig. 3a is a front view showing the second embodiment of the present invention.
Figure a is a front view showing the third embodiment of the present invention;
Figure b is a sectional view taken along line CC in Figure 4a. 1a, 1b...Metal member with semicircular arc cross section, 1c,
1d...Metal member having a U-shaped cross section, 1e, 1f...Metal member having a right triangular cross section, 21, 21'...Bending portion, 4...Heat-resistant electrical insulating material, 5...Bolt fastening tool insertion port, 6 ...Buzz.

Claims (1)

[Scope of utility model registration request] Both ends of a metal member having a symmetrical cross-sectional shape such as a half-arc shape, a U-shape, or a right triangle shape are bent inward in a straight line so that the end faces face each other, and each of the metal members is The bent parts are made to face each other and are bolted together with a heat-resistant electrical insulating material in between, and a bush made of electrically insulating material is provided between the outer periphery of the bolt and the bent part of one of the metal members facing it. A billet push rod for a billet heater, wherein a bolt fastening tool insertion hole is formed in a metal member portion interposed therebetween and corresponding to the bolt fastening position.