JPS58141388A - Manufacture of cylinder - Google Patents

Abstract

PURPOSE:To stick a self-fluxing alloy uniformly on the inner face of a pipe and to give corrosion resistance and wear resistance, by sealing the powder of the self-fluxing alloy in a pipelike steel material, diffusing it uniformly by rotating the pipe while sucking by vacuum and heating it from the outside. CONSTITUTION:A shaft for power transmission 4 and an end plate 3 for closing are attached to an end of a cylinder blank material 1 by welding. The shaft 4 is attached to a rotating jig so that the material 1 becomes parallel to the axial direction, and the powder of the self-fluxing alloy is distributed uniformly over the longitudinal direction of the material 1 from the tip 6' of a trumpet-shaped container 6. Open end of the material 1 is closed by welding 5' a mild steel plate 8, and a pipe 8 that communicates with the inside of the material 1 is welded at the center of the mild steel plate 8, and connected to a vauum pump 11 through a valve 10 and a rotary joint 12. The material 1 is sucked by vacuum while rotating it, and heated from the outer periphery while maintaining specified pressure. The self-fluxing alloy is heated to become uniform melting temperature and stuck fastly and uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cylinder, and particularly to a method for imparting corrosion resistance and wear resistance to the inner surface of a cylinder.

For resin molding, extrusion, film production, etc. of synthetic resin, extrusion machines, etc. are used as a pair of cylinder and screw to supply, transport, heat, cross-wire, etc. the resin to be molded by the screw.
It has many uses and roles such as plasticization, accumulation and adjustment of extrusion pressure, and adjustment of extrusion amount. The cylinder supports these roles, and since the resin is under high pressure during use, it must be able to withstand pressure to support this pressure. In addition, since the cylinder and the flights of the screw come into contact with each other during operation and wear out, wear resistance is required. Furthermore, since corrosive substances are generated during operation depending on the resin used, corrosion resistance is also required. To this end, the cylinders are made of steel that has been subjected to various surface treatments.

Among various surface treatments, the nitriding treatment takes a long time of 72 hours, and although the treatment time is long, the depth of the nitriding layer is as shallow as 0.1 degree of opening, and it is destroyed by wear. Once it begins to produce meat, its lifespan is short.

In addition, carburizing takes a shorter time than nitriding and produces a deeper layer, but its wear resistance is inferior to that of nitriding, and the corrosion resistance of this carburizing process is comparable to that of general steel, so it cannot be used with resins where corrosive organisms are generated. The scope of use is limited. Another method is to apply a corrosion-resistant and wear-resistant material such as C, O-based or N1-based material to the inner surface of the cylinder as a cast lining by centrifugal casting. These lining methods have the disadvantage that they require large-scale equipment such as melting equipment and casting equipment, and can only be constructed in special factories.

On the other hand, a method has been developed in which a wear-resistant and corrosion-resistant material is press-fitted into the cylinder as a thin wall, but this increases the cost because it is difficult to process a thin wall.

In the present invention, thermal spraying Ni-based (N1-1-cr + B-1
-sl).

Co-based (Co-1-N 1-)Cr+B-1-8i)
and ceramic powder (WC, NbC, etc.)
Using a self-fusing alloy powder mixed with
The purpose is to provide a cylinder with a diameter of about 50 to 8,000 mm and a diameter of about 50 to 8,004 mm, with the same level of wear resistance and corrosion resistance as a cast lining, and it is impossible to thermal spray the inner surface of a long cylinder. The present invention provides a method of lining the inner surface of a cylinder with a self-fusing alloy in a vacuum using the self-fusing alloy powder used in thermal spraying without using a thermal spraying method.

In other words, in the present invention, the self-fusing alloy powder is applied to the inner surface of a pipe-shaped steel material at room temperature and at a circumferential speed such that the self-fusing alloy powder on the inner surface is uniformly dispersed while the inside of the pipe is evacuated. The present invention relates to a method for producing a cylinder, which is characterized by heating the outer surface of the pipe while rotating the pipe, thereby uniformly fixing a self-fusing alloy to the inner surface of the pipe.

The method of the present invention can be used for resin molding, earth and sand molding machines, hydraulic pumps,
Cylinders such as concrete pumps.

It can be applied to the manufacture of various cylinder-like items such as chemical piping pipes.

Hereinafter, the method of the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a cylinder material used in the present invention. In the figure, 1 is the cylinder material, and as an example, the outer diameter is 450, the inner diameter is 164111+++1, the length is 2,800 mm, and 1. T
It is made from IS SCM 4 material with the inner diameter processed. In this case, the material is 9, which is the melting temperature of the self-fusing alloy.
Almost any steel material can be used, as long as it is a material that can withstand temperatures of about 50° to 1100° C. and can form compounds with self-fusing alloys. Note that from the viewpoint of the strength of the J-cylinder, a precipitation hardening type material whose strength is improved by low-temperature heat treatment after lining may be used. It is undesirable if rust occurs on the processed inner diameter side in the subsequent lining process, so a rust preventive treatment is applied to prevent rust from occurring if left unattended after processing.

Further, the end face of the cylinder material 1 may have a groove 2 for welding in order to connect the end plate.

The cylinder material 1 processed as described above is degreased and cleaned using a cleaning agent such as Triclean.

However, if there is rust on the inner diameter side, remove the rust from the inner diameter surface by blasting, pickling, etc.

Thereafter, as shown in FIG. 2, a power transmission shaft 4 for rotating the cylinder 1 and an end plate 3 capable of closing one end of the cylinder 1 are attached by welding 5 to the end surface of one end of the cylinder 1. At this time, leave the hole at the other end open.

The cylinder material 1 processed as above is connected to the shaft 4 with a chuck (not shown) connected to a rotation drive source (not shown) whose rotation can be adjusted, and the cylinder material 1 is attached to a jig that can rotate at an arbitrary rotation speed. . At this time, the mounting position of the material should be such that the inner diameter of the cylinder material 1 is parallel to the ground, and at the same time, since it is heavy,
~ A jig that rotates and supports from below in three places (not shown)
supports the weight.

Next, self-fusing alloy powder (remaining Ni, Cr 16wt%
.

B4vrt%, Si4wt%, Fe2wt
'%, Cu3 wt%.

Mo 3 wt4. CO, 5wt%, melting temperature 105
0°C) by taking into account the diameter of cylinder 1, coating thickness, etc.
6 odor was weighed. At this time, the thickness of the film is appropriately selected to be about 0.1 to 5 cm, because if it is too thin, it tends to become uneven. In this case, the length was 2m including the machining allowance. In addition, various self-fusing alloys have been developed.
Any material can be used as long as it is a self-fluxing alloy for thermal spraying having the above composition.

The weighed self-fusing alloy powder was heated to 10 m as shown in Figure 5.
By using a powder-unsupplying device that makes it easy to introduce the trumpet-shaped powder 6 to the tip of the vibro', the powder is uniformly distributed over the inner diameter surface of the cylinder 1, and spread over the longitudinal direction of the cylinder 1 as shown in Fig. 4. Spray 7.

Thereafter, the open end face of the cylinder 1 is opened by removing a mild steel plate 8 by welding 5' as shown in FIG. At this time, a pipe 9 leading to the inside of the cylinder 1 is welded to the center of the mild steel plate 8 so that the pulp 10 and the vacuum pump 11 can be connected.

First, pulp 10 is attached to the cylinder 1 prepared as described above, and an airtightness test is performed at 30 K4t/cm" () to confirm the airtightness of the welded parts 5 and 5'. After checking the airtightness,
A rotary joint 12 that can draw a vacuum even while the cylinder material is rotating is attached to the back of the pulp 10, and a vacuum pump 11 is connected to the cylinder 1 so that the pressure inside the cylinder 1 is adjusted to between 10-2 and 10-2.
5 Make sure that you can draw a vacuum to the Thor.

Next, the cylinder material is evacuated while rotating and heated from the outer periphery of the cylinder material while maintaining the above pressure so that the melting temperature of each self-fusing gold in the cylinder 1 becomes uniform.

The heating temperature varies depending on the self-fusing alloy used, but high temperatures up to about 0°C above the fusing point of the self-fusing alloy are permissible, but if the temperature rises higher than that, the viscosity of the self-fusing alloy will decrease. Heating at too high a temperature is not preferable because it will drip. Also, as a heating heat source.

Oxygen-acetylene, oxygen-propane, city gas.

Propane gas, electricity (including high, low frequency, and resistance heating)9
Heavy oil, light oil, etc. can be used, and here an oxygen-acetylene porous torch was used.

The cylinder material is rotated many times by a rotation source and a transmission that can be changed arbitrarily, but the rotation speed at this time can be heated uniformly.
In addition, it is necessary to select the rotation speed so that the molten film is uniform, and since the rotation speed varies depending on the inner diameter and outer diameter dimensions, it is difficult to specify, but here it is 60 rp.
Rotated at m.

When heated in this manner, the self-fusing alloy powder is melted and fixed to the inner diameter of the cylinder material 1, and the inner surface of the cylinder 1 is uniformly lined with the self-fusing garlic alloy.

After that, the pulp 10 is closed and the rotary joint 12 is closed.
Then, the vacuum pump 11 is removed and the high-temperature cylinder material is cooled using a method such as quartz clay, varmix, or a furnace heated to high temperature.The difference in thermal expansion coefficient between the cylinder material 1 and the self-fusing alloy In order to prevent the occurrence of cracks in the self-fusing alloy lining layer due to
The end plates 6 and 8 are removed and processed as desired for the cylinder to complete the product cylinder.

FIG. 5 is a diagram showing an example of the cylinder obtained as described above. In the figure, 1 is a cylinder material, 101 is a self-fusing alloy layer, 102 is a flange for fixing the cylinder, and the cylinder material 1
It is joined by welding etc.

The effects of the method of the present invention explained above can be summarized as follows.

(1) As mentioned above, cylinders for extruders, injection molding machines, etc. are required to have wear resistance, corrosion resistance, pressure resistance, etc. Pressure resistance can be adequately met with general steel materials, but corrosion resistance and wear resistance cannot be achieved with general steel materials. Therefore, by applying the surface treatment according to the present invention to the surface of the inner surface of the general steel material that will become the cylinder, it is possible to achieve low cost and pressure resistance. It is possible to manufacture cylinders with excellent durability, corrosion resistance, and wear resistance.

(2) For those treated in a vacuum, the gas in the film is degassed and a uniform film with no porosity is created.
A good self-fluxing alloy film with less oxide inclusion can be obtained.

(3) The cylinder obtained according to the present invention was used for about two years and inspected, but no abnormal wear or corrosion was observed, and good durability was obtained.

[Brief explanation of drawings]

FIGS. 1 to 4 are diagrams showing an example of the method of the present invention in accordance with the operation mode, and FIG. 5 is a diagram showing an example of a cylinder obtained by the method of the present invention. Sub-agents 1) Meifuku agent Ryo Hagiwara - Atsushi Figure 5-421

Claims (1)

[Claims] After sealing the self-fusing alloy powder into the inner surface of a pipe-shaped steel material at room temperature, the inside of the pipe is evacuated and the pipe is rotated at a circumferential speed that uniformly disperses the self-fusing alloy powder on the inner surface. A method for manufacturing a cylinder, characterized by heating the outer surface and uniformly fixing a self-fusing alloy to the inner surface of the pipe.