JP2000190367A - Structure of cylinder and screw having sliding surface subjected to superabrasion resistant surface treatment for resin injection molding machine, resin melt extruder or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance corrosion resistance and abrasion resistance of sliding surfaces of a cylinder and a screw for resin injection molding machine and a resin melt extruder or the like. SOLUTION: Single or mixed grain of diamond, CBN, ceramic and alumina, etc., are stuck on each sliding surface 20 of a cylinder and a screw of the resin injection molding machine and the resin melt extruder in two layers by an electrodeposition method so that large grains 22 are stuck on the sliding surface side and the intervals thereof are buried by small grains 24 and further an embedded plating layer 26 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a sliding surface of a cylinder or a screw in a resin injection molding machine, a resin melt extruder or the like.

[0002]

2. Description of the Related Art FIG. 2 shows the structure of a typical example of a known resin injection molding machine. 1 is a hopper for supplying a resin material, 2 is a cylinder in which the molten resin is stirred,
3 is a screw for stirring the molten resin in the cylinder 2;
Are band heaters for heating the resin from outside the cylinder, 5
Is an injection cylinder that pressurizes the resin injected into the mold 7,
Reference numeral 6 denotes a motor serving as a motor.

FIG. 3 shows a typical example of a resin melt extruder. 11 is a hopper for supplying a resin material, 12 is a cylinder in which the resin is melted, stirred and sent,
A screw 13 rotates the molten resin in the cylinder 2 to generate a feed pressure, and a heater 14 heats the resin in the cylinder 12.

[0004] Such a resin injection molding machine and a resin melt extruder are roughly classified into a standard specification machine corresponding to a general resin material, and a corrosion-resistant abrasion-resistant machine corresponding to a resin material containing glass fiber or metal powder. There are two types of wear specification machines.

Although there are various differences between the two types of molding machines, the largest differences are the cylinders 2 and 12 and the screws 3 and 13 described with reference to FIGS. The cylinder and the screw have surfaces that slide with each other, and this part is significantly different from that of the standard specification machine and that of the corrosion-resistant and wear-resistant machine. There is a great difference in that the surface is modified by the surface treatment.

For example, in a standard specification machine, JIS SACM645 is used as the material of the cylinder, nitriding is performed for the surface treatment, and a material whose hardness is set to 1000 by Vickers is used. The material of the screw is ,
JIS SCM440 is used, the surface treatment is performed with hard chrome plating, and the hardness is set so that a Vickers hardness of 750 to 800 can be obtained.

On the other hand, in a corrosion-resistant and wear-resistant machine, the material of the cylinder is a nickel-cobalt alloy (for example, trade name H
Alloy), surface treatment is performed by heat treatment, hardness of Vickers 1000 or more is used, and screw material is JIS SKD11,
In addition, tungsten carbide is used, and a surface treatment is performed by a heat treatment or the like so that the hardness of the rock well C is 58 or more.

[0008]

As described above, in such a conventional corrosion-resistant and wear-resistant machine, cylinders and screws have been devised to prevent wear and obtain durability. In particular, when a resin material containing glass fiber or metal powder is molded, the cylinder and screw are significantly worn, and there is a problem in durability. An object of the present invention is to provide a resin injection molding machine and a resin melt extruder in which the durability of a cylinder or a screw of such a corrosion-resistant and abrasion-resistant machine is prevented and durability is improved.

[0009]

According to the present invention, there is provided, according to the present invention, a method of depositing a super-wear-resistant surface-treated material grain of a first grain size on a sliding surface by a first electrodeposition method. In the gaps between the super-abrasion-resistant surface-treated particles of the first particle size, a super-abrasion-resistant surface-treated material particle of the second particle size composed of particles smaller than the super-abrasion-resistant surface treatment material of the first particle size A second electrodeposition method is applied so that the surface thereof is substantially flush with the surface of the super-abrasion-resistant surface treatment material having the first particle size, and the super-abrasion-resistant surface treatment material having the first particle size is provided. The problem is solved by embedding the gap between the grains and the second grain size super wear resistant surface treatment material grain and the gap between the second grain size super wear resistant surface treatment material grain so as to be substantially flat by the buried plating layer. Is done.

[0010] Further, according to the present invention, in the above-mentioned item, the ultra-wear-resistant surface-treated material having the first particle size is diamond, CBN (cubic boron nitride), ceramic,
The second-grain super-wear-resistant surface-treating material particles are made of any one of alumina, and the second-grain super-wear-resistant surface-treating material particles are made of any one of diamond, CBN (cubic boron nitride), ceramic, and alumina. It is solved by doing.

[0011] Further, according to the present invention, the above-mentioned object is to provide the super-wear-resistant surface-treated material grain of the first grain size in the preceding two items,
It is a mixture of two or more of diamond, CBN (cubic boron nitride), ceramics and alumina, and the ultra-wear-resistant surface-treated material of the second grain size is also diamond, CBN (cubic boron nitride). ), Ceramics, and alumina, a mixture of at least two of them can be solved.

[0012] Further, according to the present invention, in accordance with the present invention, the super-abrasion-resistant surface treatment particles having the first particle size are diamond, CBN (cubic boron nitride), ceramic, and alumina. And the second abrasion-resistant surface-treated material having the second particle size is diamond, CBN.
(Cubic boron nitride), ceramic and alumina,
The problem is solved by using a mixture of two or more types.

[0013] Further, according to the present invention, in accordance with the present invention, the superabrasion-resistant surface-treated material having the first particle size is diamond, CBN (cubic boron nitride), ceramic, alumina. And a mixture of two or more of them, and the ultra-wear-resistant surface-treated material having the second particle size is selected from one of diamond, CBN (cubic boron nitride), ceramic, and alumina. It is solved by doing so.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is to deposit particles of diamond, CBN, ceramics, alumina, etc. on a sliding surface of a cylinder or a screw in a resin injection molding machine or a resin melt extruder by an electrodeposition method. By filling the gap with a plating layer, abrasion is prevented and a resin injection molding machine and a resin melt extruder with improved durability are provided.

As for the particle size, for example, in the case of diamond, a commercially available mesh having a size of 100 to 10,000 can be used, and in the case of other materials, the same size can be used. .

First, as a first electrodeposition method, a base plating layer, a super-abrasion-resistant surface treatment material grain, and a first temporary plating layer are adhered and formed on the sliding surface. In this case, the particles of the super abrasion resistant surface treatment material are relatively large in size. In addition, the material of the super abrasion resistant surface treatment material is diamond, CBN,
One type may be selected from ceramics and alumina, or a mixture of two or more types may be used.

In this manner, the base plating surface is covered with a super-wear-resistant surface treatment material such as diamond having a relatively large particle size, and the gap between the particles is filled with a plating layer.

On the surface subjected to the first electrodeposition method, as a second electrodeposition method, a super-wear-resistant surface-treated material grain and a second temporary plating layer are adhered. In this case, the particles of the super-abrasion-resistant surface-treated particles are relatively small in size, and fill the gaps between the particles of relatively large particle size arranged by the first electrodeposition method, and have the same surface. To be. In addition, the material of the super abrasion resistant surface treatment material is diamond, CBN,
One type may be selected from ceramics and alumina, or a mixture of two or more types may be used. The selection in this case may be the same as or different from the material used for the first temporary plating layer.

In this manner, the surface subjected to the first electrodeposition method is covered with particles of a super-abrasion-resistant surface treatment material such as diamond having a relatively small particle size by the second electrodeposition method, The gap between the particles will be filled with the plating layer.

Then, in order to make the surface subjected to the second electrodeposition method smoother, buried plating is applied. By shifting in this manner, the entire surface can be made to have the same hardness as that of the selected ultra-wear-resistant surface treatment material such as diamond, and can withstand mutual sliding.

The sliding surface to be subjected to the surface treatment may be only the surface on the cylinder side, only the sliding surface on the screw side, or may be the sliding surface on both the cylinder side and the screw side. , Respectively, a certain effect can be obtained.

[0022]

FIG. 1 shows an embodiment of the present invention. Reference numeral 20 denotes a sliding surface, which is a sliding surface of a cylinder or a screw of a molding machine. Reference numeral 21 denotes a base plating layer as a first electrodeposition method, which is plated with metal such as nickel or alloy plating.

Reference numeral 22 denotes ultra-wear-resistant surface-treated particles having a first particle size of a material selected from diamond, CBN (cubic boron nitride), ceramic, and alumina. In this embodiment, the particles are diamond. . In this case, the diamond particles 22 having the first particle size have a relatively large particle size, and are attached to the surface of the sliding surface 21 together with the first temporary plating layer 23 by an electrodeposition method. In this embodiment, the first temporary plating layer 23 is formed by nickel plating to fill gaps between particles. Thus, the first electrodeposition method is constituted by the base plating layer 21, the diamond particles 22 of the first particle size, and the first temporary plating layer 23.

Reference numeral 24 denotes ultra-wear-resistant surface treatment particles having a second particle size of a material selected from diamond, CBN (cubic boron nitride), ceramic, and alumina. In this embodiment, diamond is used. . In this case, the second-diameter diamond particles 24 having a relatively small particle size are used to fill the gaps between the first-diameter diamond particles 22, and the protruding end thereof has the first-particle size. The second end is made substantially flush with the tip of the diamond particle 22.
As a second electrodeposition method together with the temporary plating layer 25. In this embodiment, the second temporary plating layer 25 is formed by nickel plating to fill gaps between particles. As described above, the diamond particles 24 having the second particle size and the second temporary plating layer 25
This constitutes the second electrodeposition method.

Reference numeral 26 denotes a buried plating layer. The second
Is plated so that the head of the diamond particles 24 is barely exposed on the surface subjected to the electrodeposition method. In this embodiment, nickel plating is used.

As the diamond particles, commercially available diamond particles having a particle size of 100 to 10,000 can be used.

By treating the respective sliding surfaces of the cylinder and screw of the resin injection molding machine, the resin melt extruder, and the like, the sliding surface is covered with a layer of diamond grains and nickel. Most are covered with diamond grains, and the minute gaps become a nickel plating layer. The hardness of the entire surface is the same as the hardness of the diamond itself as the sliding surface, and as a wear-resistant material, it can have excellent super-abrasion resistance and corrosion resistance.

In the above embodiment, the Knoop hardness is 3
1.5-104 gigapascal hardness diamond,
Although the diamond grains are used as the diamond grains 22 and 24, a material other than diamond can be used, and an effect corresponding to the hardness of the material can be obtained.

For example, CB having a Knoop hardness of 27.5 to 30
It is also possible to use N (cubic boron nitride).

It is also possible to use a ceramic having a Knoop hardness of 13 to 17 (for example, Sialon (trade name) or cermet (trade name) obtained by mixing titanium carbide and alumina with ceramic).

It is also possible to use alumina having a Knoop hardness of 16.

These materials may be used alone or in combination of two or more. As for the mesh of the particles of the material other than the diamond grains, those having a mesh of 100 to 10,000 can be used similarly to diamond.

Further, even if the type of the super-wear resistant surface treatment material particles used in the first electrodeposition method and the type of the super wear resistant surface treatment material particles used in the second electrodeposition method are the same, Or, there is no problem even if they are different from each other.

Furthermore, a single material is selected for both the super-wear-resistant surface treatment material particles used in the first electrodeposition method and the super-wear-resistant surface treatment material particles used in the second electrodeposition method. It does not matter if two or more materials are selected and a mixture thereof is selected.

Further, in the above embodiment, each plating layer is nickel-plated, but it does not matter if it is metal plating or alloy plating.

In the above-described embodiment, the surface treatment of the present invention is applied to the sliding surfaces of both the cylinder and the screw of the resin injection molding machine and the resin melt extruder. Even if it is applied only to the moving surface or only to the sliding surface of the screw, a certain effect can be obtained.

[0037]

As described above, according to the present invention, particles such as diamond, CBN, ceramics, and alumina are applied to a sliding surface of a cylinder or a screw in a resin injection molding machine or a resin melt extruder by an electrodeposition method. First, large particles and the gap were filled with two layers so as to fill them with small particles, and a buried plating layer was formed on the surface. This greatly improved the corrosion and abrasion resistance of the sliding surface. It can be expected to greatly extend the service life especially when resin containing glass fiber or metal powder is molded with a resin injection molding machine or extruded with a resin melt extruder. Is obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a sliding surface of a resin injection molding machine and a resin melt extruder of the present invention.

FIG. 2 is an explanatory view of a general resin injection molding machine.

FIG. 3 is an explanatory view of a general resin melt extruder.

[Explanation of symbols]

20 sliding surface 25 Embedded plating layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C25D 15/02 C25D 15/02 F

Claims (5)

[Claims] An ultra-wear-resistant surface-treated material grain of a first grain size is attached to a sliding surface by a first electrodeposition method, and a gap between the super-abrasion-resistant surface-treated material grain of the first grain size is provided. The first
A second particle size ultra-abrasion resistant surface treatment material comprising particles smaller than the super abrasion resistant surface treatment material particle having a particle size of A second electrodeposition method so as to be substantially flush with the surface, between the superabrasion-resistant surface-treated material particles having the first particle size and the super-abrasion-resistant surface-treated material particles having the second particle size, and The sliding surface in a resin injection molding machine, a resin melt extruder, or the like, characterized in that gaps between the super-wear-resistant surface-treated material grains of the second grain size are embedded so as to be substantially flattened by an embedded plating layer. Super abrasion resistant surface treated cylinder and screw structure. 2. The super-abrasion-resistant surface-treated material having the first particle size is:
The second particle size of the super-abrasion resistant surface treatment material is made of one of diamond, CBN (cubic boron nitride), ceramic, and alumina. Diamond, CBN (cubic boron nitride), ceramic, 2. The structure of a cylinder or a screw having a sliding surface of a resin injection molding machine, a resin melt extruder, or the like, the sliding surface of which is made of any one of aluminas. 3. The super-abrasion-resistant surface-treated material having the first particle size is:
It is a mixture of two or more of diamond, CBN (cubic boron nitride), ceramics and alumina, and the ultra-wear-resistant surface-treated material of the second grain size is also diamond, CBN (cubic boron nitride). ), A mixture of two or more of ceramics and aluminas, and a super-abrasion-resistant surface treatment for a sliding surface in a resin injection molding machine, a resin melt extruder or the like according to claim 1. Cylinder and screw structure. 4. The super-abrasion-resistant surface-treated material grain of the first particle size is:
The super-wear-resistant surface-treated material of the second particle size is diamond, CBN (cubic boron nitride), ceramic, or alumina. 2. A sliding surface of a resin injection molding machine, a resin melt extruder, or the like according to claim 1, which is made of a mixture of two or more kinds of aluminas. Structure of cylinder and screw. 5. The ultra-wear-resistant surface-treated material having the first particle size,
It is a mixture of two or more of diamond, CBN (cubic boron nitride), ceramics and alumina. The ultra-wear-resistant surface-treated material of the second grain size is diamond, CBN (cubic boron nitride). ), Ceramic, or alumina, wherein the sliding surface of the resin injection molding machine, the resin melt extruder, or the like according to claim 1 is subjected to ultra-wear-resistant surface treatment. Structure of cylinder and screw.