JPH04110421A - Holder for long-sized material to be heated - Google Patents

Abstract

PURPOSE:To prevent the damage to a long-sized material to be heated itself and dislocation of the bonding position by providing a rotary support in the axial direction of the material and placing the material on the support. CONSTITUTION:First and second protrusions 2 and 3 are formed on both ends of a plate support 1, and first and second receivers 2a and 3a for first and second rollers 4a and 4b are respectively formed on the protrusions 2 and 3. The rollers 4a and 4b have a furrowed recess 5 with the center circularly cut when seen in direction of the arrow B2, and a shaft 61 placed thereon is not tumbled down. A third protrusion 6 is formed at the center (L1=L2) of the support 1, and a stationary supporting plate 7 is erected. When a long-sized material 60 is heated under these conditions, the left and right ends of the shaft 61 extend outward, hence the rollers 4a and 4b are rotated, however the fixing and supporting position at the center is not dislocated since the frictional resistance of the roller is small, and the rollers 4a and 4b and shaft 61 are not damaged.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a holding device for a long object to be heated, and in particular, a device for holding a long object to be heated, such as a shaft, and a device to be welded such as a shaft. The present invention relates to an improvement in a holding device for a long object to be heated, which is used when performing heat treatment at high temperatures.

[Conventional technology]

For example, camshafts, rocker arms, etc., which are wear-resistant precision parts for internal combustion engines, are sometimes manufactured by joining other iron-based sintered parts, such as cams, to a steel base material.

FIGS. 3A and 3B show a conventional heating device for a long object to be heated.

A support stand 51 having first and second support plates 52.53 is disposed within the heating furnace 50, and a long object to be heated 60 is placed on the support plates 52.53.

The long object to be heated 60 is joined to a cylindrical shaft 61 at a predetermined position by a plurality of cam members 62a, 62b to 62n.

When the second support plate 53 is viewed from the direction of arrow B1, the rectangle is 1. second support plate 53
A semicircular recess 53a is formed in one long side of the shaft 61, and the end of the shaft 61 is placed in this recess 53a. The first support plate 52 is also configured similarly to the second support plate 53.

In the above configuration, a predetermined gas is supplied into the heating furnace 50, first, preheating is performed for dewaxing, and then,
The temperature in the furnace is raised to about 1100° C. and the cam member is integrally sintered and bonded to the shaft.

[Problem to be solved by the invention]

By the way, when the shaft 6 is heated to a high temperature as described above, it thermally expands and mainly extends in the axial direction.

Therefore, due to the elongation, the outer peripheral surface of the shaft 61 and the second
Friction occurs between the inner peripheral surface of the recess 53a of the support plate 53, and the outer peripheral surface of the shaft 61 rubs against both support plates 52, 53, resulting in damage to the shaft, or in some cases, the cam portion H62a. There was a problem in that the support plate 52 came into contact with the shaft 61 and the cam member 62a and the joint position of the shaft 61 and the cam member 62a shifted.

Therefore, the present invention was made to solve the above-mentioned problems, and even if a long object to be heated is stretched due to thermal expansion,
For example, it is an object of the present invention to provide a holding device for a long object to be heated, which does not damage the shaft and prevents displacement of the joint position between the shaft and the cam member.

[Means to solve the problem]

In order to achieve this object, the present invention provides a long object holding device for holding the long object when the object to be welded is brought into contact with the long object and subjected to heat treatment at high temperature. The heated object holding device includes a rotary support that is rotatable in the axial direction of the elongated object, and the elongated object main body is placed and held on the rotary support.

[Effect]

The long object body is placed on a rotating support. In this state, when the long object to be heated is heated to a high temperature, the main body of the long object expands due to thermal expansion, but the friction between the long object and the rotating support due to the load of the long object is Since it is friction, there is little frictional resistance.

Therefore, for example, the rotating support and the main body of the elongated object will not be damaged.

〔Example〕

Embodiments embodying the present invention will be described below with reference to the drawings. Note that the same parts as those explained in FIGS. 3(A, 3) and 3(B) are designated by the same reference numerals, and redundant description will be omitted.

Example Embodiments of the present invention are shown in FIGS. 1A and 1B.

In this embodiment, the central portion of the shaft is fixed.

In FIGS. 1A and 1B, first and second protrusions 2.3 are formed at both ends of the support base 1 made of a flat plate, and each protrusion 2.3 has a second protrusion. 1. The first and second roller supports 2 a % that receive the second rollers 4 a, 41]
3a is formed. When viewed from the direction of arrow B2, the first roller 4a has a constricted concave portion 5 whose central portion is cut into an arc shape to prevent it from rolling down when the L1 shaft 61- is placed thereon, as shown in Figure (B). is being used. 2nd roller 4
b is similarly configured. 1st and 2nd rollers 4a%
The material of 4b is preferably one that is durable against heat and cooling during heat treatment over time (for example, silicon nitride,
alumina).

A third protrusion 6 is formed at the center (L-L2) of the support base 1, and a thin fixed support plate 7 stands upright. The position where the fixed support plate 7 is in contact with the shaft 6 is a position where there is no displacement due to thermal expansion.

When the elongated object to be heated 60 is heated under such a configuration, the left and right ends of the shaft 6 each extend outward. However, due to this elongation, the first and second rollers 4a and 4b rotate, respectively, and since the resistance of rolling friction is small, the central fixed support position will not shift, and the rolling rollers 4a and 4b will not be damaged. , there is no effect such as damage to the shaft 61.

Modification Example FIG. 2 shows a modification example. This is one end of the shaft 61 (
This is a case where the right end) is fixed. In addition, Fig. 1 (A), (
The same parts as B) are given the same reference numerals.

In FIG. 2, the elongated heated object 60A is obtained by removing the central cam 621 from the elongated heated object 60 (see FIG. 1) and adding a cam 62q to the right end.

A protrusion 12 having a strain relief 1.2a is formed in the center of the support base 1, and a protrusion 13 with a fixed support plate 7 upright is formed on the right end side. An abutting plate 14 is fixed to the right side of this protrusion 13.

With this structure and heating, even if elongation occurs due to thermal expansion, this elongation is rotationally absorbed by the first roller 4a and the second roller 4b, and the fixed support plate 7 does not shift. Note that by using the abutment plate 4, positioning can be performed more reliably.

Note that since the rollers 4a- and 4b have a cylindrical shape, there is no change in the height of the support point, and bending of the shaft can be prevented.

Furthermore, if the weight of the long object to be heated is large, the diameter of the rollers may be increased.

〔Effect of the invention〕

As is clear from the detailed description above, according to the present invention,
Even if the long heated object stretches, the elongation is absorbed by the rolling of the rotating support, and the rolling friction is small, so the long heated object itself will not be damaged, and the joint position of the long heated object itself will not shift. etc. will not occur.

[Brief explanation of drawings]

1(A) and 1(B) are an overall side view and a side view of essential parts of an embodiment of the present invention, FIG. 2 is a side view showing a modification of the embodiment of the present invention, and FIG.
A, ) and (B) are an overall side view and a main part side view showing a conventional example. 1...Support stand 2.3.6...Protrusion 2a-, 3a...Roller receiver 4a-, 4b Roller 5...Recess 60...Long heated object 61...Shaft (long Shakumono body) 62a, 62b ~ 62q-cam

Claims (1)

[Scope of Claims] 1. A holding device for a long object to be heated, which holds the main body of the long object when the object to be welded is brought into contact with the long object and subjected to heat treatment at high temperature, comprising: What is claimed is: 1. A holding device for a long object to be heated, comprising: a rotating support rotatable in an axial direction; and the long object main body is placed and held on the rotating support. 2. The rotating support has a constricted recess in the center,
The device for holding a long object to be heated according to claim 1, wherein the long object is supported within the constricted recess.