JPS58117875A - Treatment for inside surface of blank material for cylinder - Google Patents

Abstract

PURPOSE:To improve corrosion resistance and abrasion resistance of the inside surface of a blank material of cylinder easily and inexpensively, by heating a pipe-like steel material while rotating the same and dispersing and sticking powder of a self-fluxing alloy uniformly on the inside surface and further remelting the same with laser beams. CONSTITUTION:The inside surface of a blank material 1 for cylinders consisting of iron or steel material is applied with a rust preventive treatment and is further defatted and washed; thereafter, an end plate 5 having a shaft 7 for transmission of rotating force is bolted 6 to said material to close one end. Powder 9 of a self-fluxing alloy of Ni base or the like consisting of Ni, Cr, B, Si, etc. is dispersed uniformly in the material 1 and the open end is closed by bolting 11 an end plate 10 thereto. While the material 1 is rotated horizontally, the material is heated from the outside circumference to melt the alloy 9, whereby a uniform lining layer 2 is formed. Thereafter, the end plate 10 is removed, and the laser light 13 generated with a laser light source 12 of CO2 from the open end part is irradiated by using a reflecting mirror 4 to the layer 2 cause zone fusing again; thereafter, the material is cooled at the lowest rate, whereby the film of the uniform metallic compsn. is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating the inner surface of a cylinder material, and particularly to a method for enhancing the corrosion resistance and wear resistance of a cylinder without using large-scale equipment.

Resin molding machines and extruders used for molding, extruding, and making films of synthetic resins have a cylinder and a screw as a pair, and the screws supply, transport, heat, knead, plasticize, etc. It has many uses and roles, such as accumulating and adjusting extrusion pressure, and regulating the number of push piles.

The cylinder supports these roles, and since the resin becomes under high pressure during use, it must be able to withstand pressure to support this pressure.

The cylinder and screw flights contact and wear during operation, so wear resistance is required.

Also, depending on the resin used, corrosive substances are generated during operation, so corrosion resistance is also required.

For this purpose, cylinders are made of steel that has been subjected to various surface treatments. Among various surface treatments, nitriding requires a long treatment time of 72 hours, but the depth of the nitriding layer is as shallow as 0.1 wn, so once the thickness begins to decrease due to wear, the lifespan is short. Further, carburizing treatment takes a shorter time than nitriding treatment and the layer is deeper, but the wear resistance is inferior to that of nitriding treatment.

In addition, with this image treatment, corrosion-resistant Kf- cannot be used with resins that generate corrosion products at the same level as general column materials, and its use is therefore limited. Another treatment method is to line the inner surface of the cylinder with corrosion-resistant and wear-resistant materials such as CO-based or N1-based materials using centrifugal casting, but these linings require large-scale equipment such as melting equipment and casting equipment. It requires special ＼ It has the drawback that it can only be destroyed in a factory. Furthermore, a treatment 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 thin walls.

The present invention 1 provides a method for treating the inner surface of a cylinder material without the above-mentioned drawbacks.

By the way, the above-described Co-based and Ni-based materials having corrosion resistance and wear resistance have been conventionally used as self-fluxing alloys for thermal spraying. However, cylinders, especially long ones (10 to 60
It is extremely difficult or impossible to perform thermal spraying on the inner surface of a cylinder with a diameter of about 50 to 800 mm.

Therefore, in the present invention, the above-mentioned self-soluble 0:: 03
It is an object of the present invention to provide a method for lining the inner surface of a cylinder without depending on the size, and thereby to manufacture a cylinder having wear resistance PIE and corrosion resistance comparable to those of the above-mentioned cast lining.

That is, in the present invention, after filling the inner surface of a pipe-shaped material with a powder of a self-soluble synthetic decoy, the pipe is rotated to transfer the powder to the inner surface (
Disperse this uniformly and simultaneously heat it from the outer surface of the pipe to solidify the nanometer alloy, and then heat the fixed self-fusing alloy with a laser beam and melt it.
- This relates to a method for treating the inner surface of a cylinder material, which is characterized by forming a self-melting alloy layer.

The method of the present invention is not limited to the cylinders of the above-mentioned wood forming machine, but can also be applied to cylinders of earth and sand forming machines, hydraulic pumps, concrete pumps, etc., pipes for chemical piping JT, and various 7-ring types. Can be done.

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

Figure 1 i is a cross-sectional view of Renoda Tozai 1 applied to the 75 method. Here, j −#ll and [7−
C1 outer diameter φ450, inner diameter φ16Aran, length 280
The material of the present invention is self-fusing, can withstand temperatures of about 950° to 1100°C, which is the bath melting temperature of σ, and is self-fusing. Yure with a basic F-o that can create combination therapy and compounds (
Since the tf is good, most of the 7.1 steel materials can be used. Note that depending on the strength of the cylinder, a given material can also be used (C) given that precipitation hardening can be achieved through low-temperature heat treatment after lining.

If rust occurs on the processed inner diameter side, it is not as desirable as in lining 1, so rust prevention treatment is applied to prevent rust from occurring if left after processing. The cylinder material 1 is still machined with bolt holes 4 for fixing the end plates so that both ends can be closed with the end plates.

The cylinder material 1 that has been processed as described below is degreased and cleaned using a cleaning agent such as Triclean.

However, if there is rust on the inner diameter side, please blast it.
Remove rust from the inner diameter surface by dredging, etc.

1. As shown in Figure 2, a shaft 7 that transmits the power for rotating the cylinder material 1 and an end plate 5 that can close one end of the cylinder material 1 are attached with bolts 6. At this time, one end of the pond of the cylinder material 1 is opened and the 1
This /ring material 1 is attached to a rotary drive source (not shown) whose rotational speed can be adjusted via @7. At this time, the cylinder material 1 is installed so that its inner diameter is in the iV- line with the toya surface, and at the same time, the cylinder material 1 is attached so that its I! In order to support I'i;, one to three locations in the longitudinal direction are rotatably supported from below by a jig shown in FIG. 4'.

On the other hand, a self-fusing alloy 1, for example, Nl+r'r→-H+
Nl-based materials such as S1, Co-based materials such as Co+Ni+Cr+B+Si, and ceramic powders (wc, Nbc:
? F)! -Cylinder material 1
The scale should be determined taking into consideration the inner diameter of the tube, coating thickness, etc. Here, 67%! 26 kg of +1-16% cr-a% B-a%81 was weighed out.

Note that if the film thickness is too thin, it tends to become uneven.
It is preferable to have a culm degree of 01 to 5, where the length is 2 meters (designed to be odd) including the construction cost.

Next, the aged self-soluble synthetic powder Q19 is introduced into the self-soluble synthetic pot powder, which has a trumpet-shaped part 8' at the tip of a pipe 8 with a diameter of 10 mm as shown in Fig. 153. The self-fusing alloy powder 9 is introduced into the cylinder blank 1 and is uniformly dispersed inside the cylinder end 1 as shown in FIG.

Thereafter, the end plate 10 is attached to the open end of the cylinder material 1 with bolts 11, as shown in FIG. 14, and the open end is closed.

Then, while rotating the cylinder material 1 at, for example, 6 Or, p, m, the inner diameter of the cylinder material 1 is measured from the outer periphery 8 of the cylinder material 1 using, for example, a l-sulfuric acid group-acetylene porous torch, and the melting temperature of the self-fusing alloy is measured. Heat to 1050°C. This temperature differs depending on the self-fusing alloy used, but it is 10°C below the fusing point of the alloy.
It is permissible up to a high degree of 11i antiquity. However, if the temperature becomes too high, the viscosity of the self-fusing alloy decreases and it will not flow, so heating at too high a rate is not preferred. In addition to the above-mentioned oxygen-acetylene, as a heating heat source, acid purple-propane, "its width gas", fluoropane gas, ton air (including high, low frequency, resistance heating, etc.), light oil, etc. are used. .

Still, the rotational speed of the cylinder material 1 is determined by the inner and outer diameter dimensions of the cylinder material 1.
It is only necessary to heat the metal evenly, and to make sure that the self-fusing metal is melted to form a uniform film.

Through the above operations, the self-fusing alloy melts and adheres to the inner diameter of the cylinder material, forming a uniform lining 1. This state is shown in Figure 7-15. , IS5 In the figure, 11 is the cylinder material, 2 is the cylinder gf-), a self-fusing alloy layer lined on the inner surface of 1, 5 is the flange for fixing the cylinder, welding'', 1%; (( The components of the self-fusing alloy layer 2 attached to the cylinder material 1 are shown in Figure 6.In Figure 6, the oxide film of each particle is shown. Oi+ is removed without leaving any residue, and the residue at the pore opening is also wetted, but
Between each particle, soil ↑, - are combined. This -, +-, 4 can be used for 1φ. On the other hand, in cylinders such as extruders and injection molding machines, this pore opening is This is not a good idea since a finger of wood may remain in the cylinder etc.Therefore, while the cylinder is still heated, remove the end plate 10 shown in Fig. 4, and from this open end, 1).

As shown in Fig. 7, the self-fusing alloy 2 is irradiated with a J-'' laser beam 15 generated by the kCCO2 laser beam source 12, and while rotating the cylinder 1, the reflector 14 is pulled out toward the open VjM section. Zone fusing is carried out (the molten part is enlarged while joining the part 8 crushed by the laser beam 13, and the whole curve is r4 melted). At this time, the material is cooled in the cylinder by 1' and then 7. Due to the difference in the expansion of the cylinder base material 1 and the lining film 2, cracks will occur in the lining film 2, so heat the cylinder 1 first and heat it to 800℃ or higher. It is preferable to keep the reused materials in the same manner as above (i.e., silica gravel, var mix, heat insulating material, furnace/r, etc.). , and processed to the specified dimensions. When this beaded and curved cylinder was used as a cylinder for injection molding, it was approximately 2.1 [d, special C'+'l, normal However, the durability was confirmed to be 44.1/) to 1'.

Incidentally, FIG. 8 1 is a 511i fine frame copy 6 of the refused lining film, and the nuclear diagram shows that a film with a uniform composition has been obtained.

[Brief explanation of drawings]

・Figures 1 to 4 are diagrams showing the steps of the method of the present invention, and Figure 5 is a diagram showing the procedure of the method of the present invention.
S'/') Figure 96 Figure 7: Self-fusing alloy lining produced by the method of the present invention, -Example +1
Figure 7. A diagram showing an example of the heat treatment method for the 2000 yen obtained by the method invented by Tsuchimoto.
・S f3 p/1. rl: A photo of i,;) treated by the heat treatment method shown in Figure 7. A photo of a row of l'l t-F 11 linings. Sub-agent [B Meiko agent Yu Hagiwara - Figure 5

Claims (1)

[Claims] After sealing the self-fusing alloy powder into the inner surface of the pipe-shaped steel material, the pipe is rotated to uniformly disperse the powder on the inner surface, and at the same time, the pipe is heated from the outside surface to fix the self-fusing alloy, and then this fixation is performed. A method for treating the inner surface of a cylinder material, characterized by forming a self-fusing alloy layer by heating and remelting the self-fusing alloy with a laser beam.