JPS62119150A - Cementitious inductrial instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to cement-based industrial equipment, and in particular, when used in machine tool beds, columns, etc., machining accuracy is reduced due to vibrations generated from the power part of the processing machine during machining work. The present invention relates to cement-based industrial equipment that suppresses deterioration and is suitable for various industrial materials such as molds for molding and molds for industrial models.

[Prior Art] In general, there are various types of industrial equipment, but in the present invention, industrial equipment refers to equipment for machine parts such as machine beds and columns, molds such as press molds and injection molds, master molds, etc. Refers to various industrial materials and products, including those for industrial models such as tracing models.

Conventionally, such industrial equipment has mainly been made of metals such as steel, cast iron, and stainless steel, and other materials such as ceramics have also been used.

Furthermore, cement concrete or resin concrete has been used experimentally or practically as a material for machine parts of machine tool beds.

[Problems to be solved by the invention] However, as it is said that metals such as steel, cast iron, and stainless steel will resonate if you strike them well, when used for machine beds, columns, etc. Vibration is easily transmitted,
In addition, since it has good thermal conductivity, its accuracy changes due to vibrations and thermal changes in the movable parts of the processing machine, which has the disadvantage of causing problems in machining accuracy, especially in machine tools.

In addition, when cement concrete is used as a material for machine parts in machine tool beds, it improves vibration during machining work and machining accuracy compared to metal, but porous materials are better from the perspective of vibration absorption. It is thought that
Doing so will reduce the strength of the concrete member.
The durability of machine tool beds using this will be low.

In addition, resin concrete products have an insufficient modulus of elasticity and are more expensive than cement-based products.

Furthermore, when metal is used as a molding material such as a press die, molten metal is used, which requires complicated processes such as sand mold making, casting, demolding, sandblasting, and final polishing. There is also the problem that similar processes are required for industrial models.

The inventor of the present invention has conducted extensive research to solve these conventional problems, and has found that a cement hardened body containing calcium sulfate is a product that uses an inexpensive cement system, has high strength, and has excellent vibration damping properties. It is an excellent material with low thermal conductivity, can be cast at room temperature, and cures at room temperature.
The present invention was completed after discovering that it is suitable as industrial equipment.

[Means for Solving the Problems] That is, the present invention is a cement-based industrial equipment characterized by being made of a hardened cement body containing calcium sulfate.

The present invention will be explained in detail below.

The hardened cement body containing calcium sulfate in the present invention is produced by blending cement, calcium sulfate, water, and arbitrary amounts of other materials such as sand, gravel, admixtures, admixtures, and the like.

Examples of cement include kneelite, C3S, and ordinary cement.
Various early-strength, ultra-early-strength, and white Portland cements can be used alone or in combination. Other cements include blast furnace cement, fly ash cement,
Moderate heat cements and cements containing large amounts of slag can also be used.

As calcium sulfate, it is preferable to use at least one type of anhydrous salt or industrial water salt, preferably type 1 anhydrite.

As an admixture for reprints whose main component is calcium sulfate,
For example, Denki Kagaku Kogyo ■, product name “Denka Σ1000” 9
Nippon Cement ■, product name "Asano Super Mix",
Showa Mining ■, product name "Guimix", Osaka Cement ■
, the product name "Non-Crepe", etc. can also be used. The standard usage amount of calcium sulfate is cement 100
It is desirable that the amount is 1 to 20 parts by weight, preferably 5 to 15 parts by weight.If it is less than 1 part by weight, it will not have the effect of increasing the strength of the hardened cement product, and even if it is mixed in an amount exceeding 20 parts by weight, the hardened cement product will not increase. This is not preferable because it has no effect on increasing the strength of the steel and causes expansion cracks, etc.

Water may be any water as long as it does not adversely affect the hardening of cement, and potable water, factory recovered water, etc. can be used.

The amount of water added is 50 parts by weight or less, preferably 35 parts by weight or less, based on 100 parts by weight of cement, from the viewpoint of strength development, but it is better to reduce it as much as moldability allows.

Other materials added to the hardened cement include aggregates such as sand and gravel, admixtures, and admixtures.

As for the aggregate, it is possible to use sand, gravel, crushed stone, crushed sand, etc. that are normally used in lightweight and ordinary concrete, or it is preferable to use harder aggregate to obtain a high quality cement hardened product. .

Examples of hard aggregates include silica, pyrite, hematite, magnetite, yellow jade, lawsonite, corundum, zenasite, spinel, beryl, whole curb stone, tourmaline, granite, andalusite, cross stone, zircon, calcined bauxite, Boron carbide, tungsten carbide, ferrosilicon nitride, silicon nitride, fused silica, fused magnesia, silicon carbide, cubic silicon nitride, iron powder, iron ball single-fired band keratite, great wall stone, fused alumina, etc. can be used.

Examples of admixtures or admixtures that can be used include water-reducing agents, high-performance water-reducing agents, swelling agents, water-soluble polymers, resins such as epoxies, and emulsions.

Additionally, various fibers such as steel fiber, glass fiber, carbon fiber, etc. can also be used.

High-performance water reducing agents are surfactants that do not cause too much delay in setting or excessive air entrainment even when added to cement in large quantities, and have high dispersing power. Examples include salts of sulfonic acid formaldehyde condensates, high molecular weight likunin sulfonates, polycarboxylate salts, etc. as main components. The standard amount of water reducing agent used is 1 part by weight or less in terms of solid content per 100 parts by weight of cement, or in the present invention, it may be added in a larger amount, preferably 10 parts by weight or less. ,
More preferably, it is 1 to 5 parts by weight.

Use of an expansion material is effective for adhesion to a metal frame, etc., which will be described later, and for reducing shrinkage. As an expanding material, quicklime type,
Quicklime-gypsum based materials and calcium sulfoaluminate based products are effective, and from their expandability, the preferred amount used is 15 parts by weight or less per 100 parts by weight of cement.

The cement-based industrial material of the present invention can be easily manufactured by blending predetermined amounts of each of the above-mentioned materials, kneading, and molding.

During manufacturing, it is possible to use composite systems using reinforcing materials such as fibers, nets, reinforcing bars, steel frames, and iron plates, as reinforcement for tensile or bending of the hardened cement, and as surface protection. For the installation of machinery, parts and bolts, and for the installation of anchors, parts can be embedded, such as iron plates, bolts, nuts, etc.

Next, an example of a method for manufacturing a mechanical bed using the material of the present invention can be generally carried out as follows. If a metal frame is used, it is manufactured, and if a metal frame is not used, a formwork of a predetermined shape is prepared. If necessary, set steel frames or reinforcing bars in advance. The materials are uniformly kneaded using a mixer. The kneading method is not particularly limited, but there are methods such as adding and mixing all the ingredients simultaneously, and division methods such as kneading the ingredients except for the water reducing agent in advance, adding the water reducing agent to this, and kneading again. A kneading method etc. is possible.

The mixer is not particularly limited and may be any ordinary mixer.

The uniformly kneaded material is then molded in a previously prepared metal frame or mold by methods such as pouring, injection, and press-fitting, using a vibrator as necessary, and is then molded at room temperature and pressure, and at high temperature and normal pressure. It can be obtained by curing under high temperature and pressure.

The hardened cement obtained by the method described above, which is obtained by adding cement, calcium sulfate, water, and arbitrary amounts of other materials, has a high compressive strength of 700 kg/cm2 or more, and has a logarithmic decay rate of 0.02. With the above, it becomes a cement-based industrial material with stable quality and excellent performance.

[Function] Since the cement-based industrial equipment of the present invention is composed of a hardened cement body containing calcium sulfate, the strength of the hardened cement body increases due to the calcium sulfate contained therein, and the structure becomes densified and changes. Therefore, it is presumed that a stable cured product with high strength, low thermal conductivity, excellent vibration damping properties, and moldability is formed.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 Using the formulation shown in Table 1, a diameter of 10 cm and a height of 20 cm was prepared.
Table 1 shows the results of measuring the compressive strength after 28 days of age after curing in water at 20±2°C after making cylinders of m in diameter. However, the compressive strength was measured in accordance with JIS A-1108 using a 200T EE shrinkage tester (Mori Shikenki Seisakusho).

Table-1 Materials used> Cement: Manufactured by Denki Kagaku Kogyo ■, early-strength Portland cement Calcium sulfate: Manufactured by Denki Kagaku Kogyo ■, product name "Denka Σ"
100OJ (Brain value approx. 5000cm"/g') Water: Tap water Coarse aggregate: A, Crushed stone (Gaax = 13mm) 2 B1 Heavy-fired Huntstone rock (2, X = 13mm +) Fine aggregate 20,
Silica sand (0.15-2.5 mm): D9 heavy-fired band rock ((1.3-3 mm)) Others: High performance water reducing agent, manufactured by Denki Kagaku Kogyo ■, product name "Denka FT-500J" (in terms of active ingredients) (Main component: Salt of alkylnaphthalene sulfone-formaldehyde condensate) Example 2 Using the hardened cement of blending example No. 6, a machine tool bed as shown in Fig. 1 was prototyped.The structure was as follows. The bed was made of reinforced concrete and placed in each cross section so that the reinforcing steel ratio was 0.5 to 1.2%.By applying an impact to any point on this bed, the maximum amplitude of the propagating vibration was compared to that of a conventional cast iron bed of the same type. It was compared with that of BET.The logarithmic decay rate of each was also measured.The results are shown in Table 2.

Table 2 Notes: (1) The logarithmic damping rate is the value obtained by logarithmically converting the amplitude of the free damping vibration waveform and using the least squares method.

(2) The maximum amplitude ratio was measured by setting an accelerometer at an arbitrary point.

Example 3 Using the hardened cement of blending example No. 3, a bare press mold as shown in FIG. 2 was prototyped. The structure is made up of deformed reinforcing bars D16 (nominal diameter 16II11) arranged in a lattice pattern, and surrounding iron plates (thickness 61111 mm) are used to prevent chipping.
) frame was made and reinforced. Using this press mold, iron plate (
When pressed, a pressed iron plate having a predetermined shape and dimensions was obtained.

Example 4 Using the hardened cement of blending example N002, by injection of PVC, a thickness of 2a++a, a length of 18cm, a width of 2
．． An injection mold for making a 5c+s flat PVC board was prototyped and tested, and a flat PVC board was obtained.

[Effects of the invention] By using the cement-based industrial equipment of the present invention, machine tool beds and columns with excellent vibration damping properties, strong strength, low thermal conductivity, and little dimensional change due to rapid temperature changes can be obtained. It is possible to manufacture mechanical parts such as

Machine parts such as machine beds and columns manufactured in this manner can improve machining accuracy because the vibrations generated from the power part do not resonate with a single mechanical part.

In addition, the cement-based industrial materials of the present invention are strong, have excellent dimensional stability, can be cast at room temperature, and are useful as materials that harden at room temperature, so they can be used in press molds, injection molds, etc.

It is extremely useful as industrial equipment for industrial models such as master molds and tracing models.

[Brief explanation of drawings]

FIG. 1 shows a perspective view of a machine bed for a grinder, and FIG. 2 shows a perspective view of a press die. 1...Drive unit installation part 2...Bed 3...Male type 4...Female type Applicant Denki Kagaku Kogyo Co., Ltd. Agent Norihiro Watanabe 1 Figure 2 Bed

Claims (1)

[Claims] Cement-based industrial equipment comprising a hardened cement material containing calcium sulfate.