JPS63221025A - Composite cylinder with abrasion and corrosion resistance - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the crack in the operation of padding weld and to improve its working life by a method in which an intermediate plastic material is welded by powder padding on the inner surface of the base material, and further on said materials, a padding material containing hard particles and being excellent in abrasion and corrosion resistance is welded by powder padding. CONSTITUTION:Austenite stainless steel is welded by powder padding as an intermediate plastic material 5 on the inner surface of the steel base material 4 such as structural carbon steel, Cr steel, Cr-Mo steel and Ni-Cr-Mo steel, etc. Further on said materials, an alloy in which the hard particles of 10-50% by volume ratio composed of one or more kinds of the carbide of elements of groups IVA, VA and VIA of the periodic table are mixed with the alloy particles composed of 0.6-1.0% C, 2.0-5.0% Si, 2.0-4.0% B, 16-18% Cr, 3-6% Fe, the balance Ni and impurity elements by weight ratio, and are dispersed therein, welded by powder padding as an abrasion and corrosion resistive materials 1, and 6. When such austenite stainless steel is used as an intermediate plastic material, since its thermal expansion (shrinkage) coefficient is large, the difference of shrinkage amount of padded layers becomes small, and since the plastic deformation is apt to occur halfway in cooling, said deformation easily follows the shrinkage, whereby the occurrence of the cracks in the padded layers is prevented.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a composite cylinder made of a wear-resistant and corrosion-resistant alloy powder welded. Regarding the cylinder.

[Prior Art] Cylinders for plastic molding machines are required to have excellent corrosion resistance in addition to wear resistance in order to prevent corrosion due to resin or additives in the resin. However, conventionally known wear-resistant alloys such as iron-based special steels do not necessarily have sufficient corrosion resistance. In addition, conventional alloys generally have the disadvantage that although they have good corrosion resistance, they have poor wear resistance.
When used as a lining for cylinders, etc., there was a problem in terms of lifespan. Moreover, in recent years, filler-containing resins, especially resins with severe abrasive effects such as plastic magnets and rubber magnets, have come to be injection molded, making it increasingly difficult for conventional special steels to meet the requirements.

Therefore, structural carbon steel, Cr steel, Or-Mo steel, Ni-
Attempts have been made to use a composite cylinder in which a powder overlay welding layer of a wear-resistant and corrosion-resistant alloy is provided on the inner surface of a tonal cylinder base material such as Cr'-Mo steel.

[Problems to be Solved by the Invention] However, in the past, only a single layer of powder build-up welding layer of wear-resistant and corrosion-resistant alloy was provided on the inner surface of the cylinder base material. When powder overlaying alloy materials with excellent abrasion resistance, the material is brittle and has the disadvantage of being prone to cracking due to the difference in shrinkage with the base material during solidification and contraction during overlay welding. .

An object of the present invention is to eliminate such drawbacks and provide a composite cylinder that can be manufactured soundly without cracking during overlay welding.

[Means for Solving the Problems] In order to solve the above problems, the present invention applies powder overlay welding to an intermediate plastic material that does not cause cracks on the inner surface of the base material, and further welds it with wear-resistant and corrosion-resistant material. The main feature is a composite cylinder made by powder overlay welding of materials containing superior hard particles.

That is, the present invention applies to structural carbon steel, Cr steel, Cr-M
Austenitic stainless steel is powder overlay welded as an intermediate plastic material to the inner surface of a steel base material such as O steel or Ni-Cr-Motj4, and further welded thereon with a weight ratio rco of 6 to 1.
0%, S+2.0~5.0%, 82.0~4.0%, C
The particles of an alloy consisting of r16-18%, Fe3.0-6.0, the balance Ni and impurity elements contain rVA of the periodic table,
vA.

A wear-resistant and corrosion-resistant composite characterized by powder overlay welding of an alloy in which hard particles of one or more carbides of group VIA elements are mixed and dispersed in a volume ratio of 10 to 50% as a wear-resistant material. It's in the cylinder.

The reasons for specifying the chemical components and weight ratios in the alloy of the present invention are as follows.

C: It solidifies into Ni, which is the main element constituting the base, to increase its strength, and also combines with alloying elements to form carbide,
Improves wear resistance, but decreases toughness as it increases. The content as wear-resistant and corrosion-resistant material is preferably in the range of 0.6 to 1.0%.

Si: Effective for increasing the hardness of the base, and also necessary as a deoxidizing element. If it is too little, sufficient hardness cannot be obtained, and if it is too much, the toughness deteriorates, so the preferred range is 2.0.
~5.0%.

B: Highly hard boride is precipitated in the structure, which is effective in increasing the hardness of the alloy and improving wear resistance, and also has the effect of lowering the melting point. However, if the amount is too low, sufficient hardness cannot be obtained, the welding 2iI point is high, and the shrinkage margin of the overlay layer after overlaying becomes large, resulting in deformation of the cylinder and the effect of tensile stress on the overlay layer. There is a problem. Moreover, if it is in excess, the alloy becomes brittle and cracks are likely to occur in the overlay layer upon cooling. Therefore, the preferred range of B is 2.0 to 5
．． It is 0%.

Cr: It solidifies in the Ni base and is effective in improving the hardness of the base, and also combines with C to form carbide to improve wear resistance. However, if the content is too little, the wear resistance and corrosion resistance will be insufficient, and if it is too much, the brittleness will increase, so the content should be 16
~18% is preferred.

Although it is effective in improving the toughness of the Fe base, in excess it reduces the hardness of the base and also reduces the corrosion resistance. Therefore, the preferred range is 3 to 6%.

Ni: A main element constituting the base, and has high corrosion resistance against various gas atmospheres. In addition, it combines with B to precipitate boride, increasing the hardness of the base, and dispersing the boride,
Increases wear resistance. Ni occupies the remainder other than the above-mentioned additive elements excluding impurity elements.

In the present invention, in order to improve wear resistance,
Hard particles made of one or more carbides of VA, VA, and VIA group elements are dispersed in the alloy. Preferred carbides are WC, NbC, TiC and VC. The hard particles occupy 10 to 50% by volume of the built-up layer. If the amount of hard particles is less than 10% by volume, the desired effect of improving wear resistance cannot be obtained, and if it exceeds 50% by volume, cracks are likely to occur in the built-up layer.

Note that this wear-resistant and corrosion-resistant composite cylinder can be made of two shafts instead of a single shaft.

[Function] When a wear-resistant material is powder overlay welded to a roll base material, austenitic stainless steel is used as an intermediate plastic material between the base material and the material, so the material has a large coefficient of thermal expansion (contraction), so the thickness is The difference in shrinkage m of the built-up layer after build-up becomes small, and since it remains in an austenite state during cooling and plastic deformation is likely to occur, it becomes easier to follow the shrinkage of the build-up layer.

This prevents the build-up layer from cracking.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of a composite single-shaft cylinder in which a wear-resistant and corrosion-resistant alloy is powder overlay welded according to an embodiment of the present invention. The cylinder in the figure has an outer diameter of 120+m.

It has an inner diameter of 40ml and a fiz size of 98011111t'.

The inner surface of the cylinder base material 3 made of steel (80M440) is coated with austenitic stainless steel (
SUS304) is powder overlay welded to a thickness of 211, and then overlay material 1 of the alloy of the present invention with excellent wear and corrosion resistance is applied.
was powder overlay welded to a thickness of 2II-. The material of the overlay material 1 is a material obtained by powder overlay welding of a mixture of wear-resistant and corrosion-resistant alloy particles with 20% by volume of WC particles. The composition of overlay material 1 is shown in Table 1.

Table 1 No cracking was observed in the wear-resistant and corrosion-resistant composite cylinder thus obtained.

Next, FIG. 2 is a cross-sectional view of a wear-resistant and corrosion-resistant composite biaxial cylinder according to an embodiment of the present invention. The method for manufacturing the biaxial cylinder shown in FIG. 2 is as follows. The chemical compositions of the base material, intermediate plastic material, and overlay material used here are the same as in the case of the uniaxial cylinder embodiment.

A pair of parallel axes with a first axis 01 and a second axis 0, respectively.
A positioner holds the cylinder body 4 of the base material, which is provided with a communicating screw hole 01, and repeats forward and reverse rotation of the positioner around the first axis 01, and moves the overlay torch to the first axis 01. 01 direction and powder overlay welding the inner surface of the screw hole having the first axis 01 with the intermediate plastic material 5, then translate the cylinder body 4 with a positioner to move the rotation center, The positioner rotates forward and backward around the second axis 02, and the overlay torch is moved parallel to the direction of the second axis 02, thereby making the inner surface of the screw hole having the second axis o2 intermediately plastic. Powder overlay welding is performed using material 5, and the upper and lower butt portions of the screw hole having the first axis 01 and the screw hole having the second axis 02 are then welded using a welding torch. After powder overlay welding is performed using the intermediate plastic material 5 by moving it in the axial direction while reciprocating in the transverse direction, each overlay welding location is processed to a predetermined thickness.
Further, powder overlay welding material 6 having excellent wear and corrosion resistance is applied thereon by the method described above.

[Effects of the Invention] As explained above, according to the present invention, an intermediate plastic material is powder overlay welded to the inner surface of a base material, and a metal material having excellent wear and corrosion resistance containing hard particles is further applied thereon. Since the overlay material is provided by powder overlay welding, cracking during overlay welding is prevented from occurring. Furthermore, it becomes possible to manufacture and supply cylinders with improved wear resistance and a longer service life, which is of extremely great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a composite single-shaft cylinder in which a wear-resistant and corrosion-resistant alloy according to an embodiment of the present invention is powder overlay welded, and FIG. 2 is a cross-sectional view of a composite biaxial cylinder. DESCRIPTION OF SYMBOLS 1... Overlay material, 2... Intermediate plastic material, 3... Base material, 4... Base material, 5... Intermediate plastic material, 6... Overlay material. Figure 1 Figure 2 Procedures Amendment Book April 13, 1986

Claims (3)

[Claims] (1) Powder overlay welding of austenitic stainless steel as an intermediate plastic material is applied to the inner surface of the steel base material, and on top of that, the weight ratio is 0.6 to 1.0% C and 2.0 to 5.0% Si. ,
B2.0~4.0%, Cr16~18%, Fe3.0~
6.0, 10 to 50% by volume of hard particles consisting of one or more carbides of Group IVA, VA, and VIA elements of the periodic table to the particles of the alloy consisting of the balance Ni and impurity elements.
A wear-resistant and corrosion-resistant composite cylinder characterized by powder overlay welding of a mixed and dispersed alloy as a wear-resistant and corrosion-resistant material. (2) The wear-resistant and corrosion-resistant composite cylinder according to claim 1, wherein the cylinder is a single shaft. (3) The wear-resistant and corrosion-resistant composite cylinder according to claim 1, wherein the cylinder is biaxial.