JPS6354491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arbor cooling device that is employed when fitting a sleeve and an arbor in a variable crown roll or the like, mainly when the sleeve has high hardness.

The surface hardness of the variable crown roll sleeve is
When the hardness is as high as Hs85, induction quenching and tempering is usually performed to impart hardness, but the tempering temperature is often 120 to 130°C.

On the other hand, the larger the clearance between the sleeve and the arbor during shrink fitting, the better for the work.This clearance is created by the expansion of the sleeve, so the temperature of the sleeve is usually relatively high, between 200 and 350℃. I want to set the temperature.

Here, hardening of the sleeve is controlled by the tempering temperature, and if the sleeve is heated to a temperature exceeding the tempering temperature and shrink-fitted, the hardness of the sleeve will be reduced. In particular, in the case of small diameter sleeves, the expansion of the sleeve is small and a clearance of at least 0.2 mm is required as in the case of large diameter sleeves, and the decrease in sleeve hardness due to the relationship between shrink fitting temperature and tempering temperature as mentioned above is a particular problem. Become.

This invention was proposed to solve these problems, and its purpose is to easily and easily attach the arbor so that the clearance between the sleeve and the arbor can be increased during fitting without reducing the hardness of the sleeve. An object of the present invention is to provide an arbor cooling device that can cool uniformly.

The arbor cooling device according to the present invention includes a cylindrical bottomed container with a heat insulating material inside and an open top, and a cylindrical bottomed container lined with a heat insulating material that can be freely attached to and removed from the opening of the bottomed container by a material machine. A link-shaped supply member includes a lid that is detachably attached to the end thereof, a link-shaped supply member that surrounds the outer circumference of the arbor suspended in the bottomed container, and has many injection holes that inject liquefied gas onto the outer circumferential surface of the arbor. The arbor has an introduction pipe for sending liquefied gas from the liquefied gas container to the supply member, and a drive mechanism that moves the supply member up and down in the arbor axis direction, and the liquefied gas uniformly and easily cools the entire arbor. This is how it was done.

The present invention will be explained below based on examples. The arbor is cooled to -70 to -196°C depending on its diameter by injecting a liquefied gas, such as nitrogen, which can reduce the ambient temperature to -100°C or lower by heat of vaporization onto the outer surface of the arbor. On the other hand, the sleeve is tempered at a temperature near the lower limit, e.g. 110
Heat to around ℃. If a cooled arbor is inserted into such a sleeve, the arbor and sleeve will fit together due to natural heat radiation and heat absorption.

Figure 1 shows an arbor with an outer diameter of 400 mm and a length of about 3000 mm that is cooled to about -80°C with liquefied nitrogen.
110mm, outer diameter 600mm, length 1500mm sleeve
This is a case where the sleeve and arbor are heated to about 0.degree.

When cooling the arbor, it is preferable to cool the arbor at a cooling rate that satisfies the following equation.

T=To-1/at (1) a=(1.25-1.7)W× ^10-3 (2) T≧-200℃ (3) However, T: Arbor temperature after t minutes [℃] To: Start of cooling Arbor temperature [°C] a: Time required to cool 1°C [min/°C] W: Weight of arbor [Kg] Next, an example of a device for cooling the arbor is shown in Fig. 2. This cooling device includes a bottomed container 1 with an open top;
It is equipped with a lid 2 of a bottomed container 1, a supply member 3 that sprays and supplies liquefied nitrogen to the outer peripheral surface of the arbor A, an introduction pipe 4 that supplies liquefied nitrogen to the supply member 3, and a drive mechanism 5 that moves the supply member 3 up and down. .

The bottomed container 1 includes, in order from the outside, a bottomed cylindrical container 1A with an open top, a heat insulating material 1B such as urethane lined on the inner surface of this outer container 1A, a pipe-shaped inner container 1C, and an inner container 1C. It consists of a heat insulating material 1D, such as styrofoam, lined on the inside surface. Furthermore, the lower part is made of heat insulating material such as styrofoam 1E, 1
F are arranged with a gap between them to form air layers 1G and 1H.

The lid 2 is made up of a steel disc 2A and a heat insulating material 2B lined with the disc 2A, and is formed to close the upper opening of the inner container 1C. In addition, an insertion hole 2C is formed in the lid 2, and the end of the arbor A is inserted into the insertion hole 2C, and the arbor A protrudes from the disk 2A.
By screwing the stopper 6 to the end, the arbor A
Attach to lid 2. As a result, arbor A becomes container 1.
It is suspended inside. Furthermore, disk 2A
A hook 7 is attached to the container, and by attaching a wire rope 8 of a lifting machine such as a crane to the hook 7, the arbor A together with the lid 2 can be taken in and out of the container.

The supply member 3 is a ring-shaped pipe material that surrounds the outer circumference of the arbor A, and is provided with a large number of injection holes for injecting liquefied gas onto the outer circumferential surface of the arbor.

A liquefied gas container 9 is provided outside, and liquefied gas is sent to the supply member 3 through the introduction pipe 4.

The drive mechanism 5 includes a wire rope 10, a pulley 11, and a winch 12, and by operating the winch 12, the supply member 3 is moved up and down.

Further, the introduction pipe 4 is connected to the supply member 3 via the pulley 13.
It is connected to a flexible tube,
A drive mechanism is configured that moves the supply member 3 up and down by horizontally moving the liquefied gas container 9 using a drive source such as a hydraulic cylinder.

In such a configuration, the arbor A is connected to the stopper 6.
By simply connecting it to the lid 2 and inserting it into the container 1 using a lifting machine, the arbor A becomes suspended in the container 1 in an adiabatic manner. From this state, the supply member 3 is moved up and down and liquefied gas is injected to mainly cool the fitting portion of the arbor A. Here, the arbor A can be uniformly cooled by moving the supply member 3 by 400 to 600 mm in 20 to 30 minutes.

Once cooled to a predetermined temperature, the arbor A is moved by a lifting machine.
is taken out from the container 1 with the lid 2 attached and inserted into the already heated sleeve.

Since the arbor cooling device according to the present invention has the above-described configuration, the arbor is cooled by −70° with liquefied gas.
Since the arbor is inserted into the sleeve after cooling it to around -196℃ and heating the sleeve to near the lower limit of the tempering temperature, it is possible to have a large clearance when mating, which is advantageous for work, and also reduces the hardness of the sleeve. The aperture can be cooled uniformly and easily with a relatively simple configuration without lowering the temperature.

[Brief explanation of drawings]

Fig. 1 is a graph showing temperature changes in the arbor and sleeve when the arbor and sleeve are fitted together, with time taken as the horizontal axis, and Fig. 2 is a longitudinal cross-sectional view showing the arbor cooling device according to the present invention. . 1...bottomed container, 1A...outer container, 1B...insulating material, 1C...inner container, 1D...insulating material, 1E,
1F...Insulation material, 1G, 1H...Air layer, 2...
Lid, 2A...disc, 2B...insulating material, 2C...insertion hole, 3...supply member, 4...introduction pipe, 5...drive mechanism, 6...stopper, 7...hook, 8... …
Wire rope, 9...Liquefied gas container, 10...
Wire rope, 11...pulley, 12... winch, 13... pulley, A... arbor.

Claims (1)

[Claims] 1 A cylindrical bottomed container with a heat insulating material inside and an opening at the top, a cylindrical bottomed container lined with a heat insulating material, which can be attached and detached to the opening of the bottomed container by a material hoist, and an arbor is detachably attached to the end of the container. a ring-shaped supply member that surrounds the outer periphery of an arbor suspended in a bottomed container and includes a number of injection holes that inject liquefied gas onto the outer peripheral surface of the arbor; An arbor cooling device comprising: an introduction pipe for sending liquefied gas to an arbor; and a drive mechanism for moving the supply member up and down in an axial direction of the arbor.