JPH01228777A - Partially impregnated polymer-grindstone compound material for grinder and its manufacture - Google Patents

Abstract

PURPOSE:To prevent the breakage of a non-grinding surface so as to improve the safety of grinding, and enhance the grinding ability of a grinding surface by allowing thermoplastic and thermosetting polymer to penetrate into the inside pores of a grindstone except the vicinity of its grinding surface. CONSTITUTION:Polymer 6 is allowed to penetrate into the inside pores of a porous vitrified grindstone 7 for a grinder except the vicinity of its grinding surface 1. Thus, the grinding surface 1 is not impregnated with the polymer 6, so that its grinding ability can be kept. And also since the inside pores in a grinding area except the vicinity of the grinding surface 1 are impregnated with the polymer 6, the crack and the breakage of the grindstone 7 can be prevented. Consequently, a clearance between an upper and a lower grindstones can be reduced due to the synergistic effect of those two matters. As a result, the grinding ability can further be improved and the ultrafine grinding of a workpiece can constantly be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polymer composite for a grinding wheel for a melter and a method for producing the same.

[Conventional technology]

As part of the development of unused resources, we are providing the market with chicken, pork, and beef bones, fish bones, etc. as paste meat with no texture, pulverization of tofu and grains, and ultra-fine production of other industrial raw materials. Pulverization has become an important development issue.

Currently, there are various types of crushers on the market, one of which is the melt crusher, which is preferred and used for industrial purposes.

As an example, let's talk about Mascolloider (trade name), which can be said to be a typical melting machine.This machine is composed of two grinding wheels, upper and lower, whose spacing can be freely adjusted.
The upper grindstone is fixed, and strong centrifugal force, impact grinding, and shear are generated between the upper grindstone and the lower grindstone, which rotates at high speed, and ultrafine pulverization is performed by the combined action of these.

Appropriate hardness and toughness are desired for the grindstone used for this purpose.

To explain the performance of conventional vitrified grinding wheels using the above-mentioned mass colloider, the raw material is first fed into the hopper and is sent into the gap between the upper and lower grinding wheels by the impact and centrifugal force caused by the impeller at the tip of the shaft and the lower grinding wheel rotating at high speed. The material is gradually pulverized into ultra-fine particles by the powerful shearing, compression, and grinding forces that occur there and then discharged.

Therefore, the lifeblood of the melting machine is the vitrified grinding wheel, but its biggest drawback is that when the gap between the grinding wheels is narrowed to obtain fine powder, the frictional heat generated during grinding of the grinding wheel is high, causing cracks and destruction due to unbalanced expansion. This can easily lead to accidents during work. This is why conventional grinding wheels require appropriate toughness.

When grinding materials with high hardness or dry materials are used, the frictional heat of the grindstone is particularly high and damage (destruction) is likely to occur.

In order to avoid these problems, it is better to widen the clearance between the grinding wheels, but doing so will prevent pulverization.

(Problems to be solved by the invention) In order to solve these problems,
A composite whetstone has been developed that is unbreakable, safe and sanitary, and has a structure in which the internal pores of a vitrified whetstone are impregnated with a thermosetting polymer, as shown in the above publication.

However, especially when grinding dry materials using such a grindstone, there is still room for improvement in terms of the sharpness of the grindstone depending on the type of grindstone.

[Means for Solving the Problems] In view of this, various studies have been carried out in the present invention, and the above-mentioned composite grinding wheel has polymer filled in the pores without exception even on the grinding surface of the grinding wheel, and the abrasive grains are made of a polymer film. It was discovered that dissatisfaction with sharpness occurs due to the state of being wrapped in a film, and as a result of further study, a partially impregnated grinding wheel polymer composite for melting machines that improves the cutting performance of the grinding surface and a method for manufacturing the same were developed. It is something.

That is, the composite of the present invention is characterized in that the internal pores of a porous vitrified grinding wheel for a melting machine, except for the vicinity of the grinding surface, are infiltrated and filled with thermoplastic and thermosetting polymers, and The method of the present invention is to apply thermoplastic type or thermosetting type plastic (synthetic resin) to the non-abrasive surface of a porous vitrified grinding wheel for a melt crusher, from the wall pores located remote from the abrasive surface to the internal pores. ) or its oligomer is forcibly injected under reduced pressure or increased pressure, and the impregnated monomer is polycondensed at a predetermined position using thermal energy.

(Function) In this way, by impregnating the area except near the grinding surface with polymer, the abrasive grains on the grinding surface are not covered with polymer, so it is superior to the above-mentioned composite grindstone in terms of cutting performance.
In addition, since the pores in areas other than the vicinity of the grinding surface are impregnated with polymer, cracking and destruction of the grinding wheel will not occur, and as a synergistic effect, the gap between the upper and lower grinding wheels can be made narrower, resulting in improved cutting performance. It has the characteristics that the process is further improved and ultra-fine pulverization of the processed material is always stably realized.

In addition, if synthetic resin monomer is injected from the wall pores of the non-grinding surface located far from the grinding surface, injection can be stopped before the monomer penetrates the internal pores and reaches the grinding surface. This has the advantage that a partially impregnated polymer composite is obtained.

The treatment liquid used for impregnation is usually a vinyl thread binder, a vinylidene monomer, or a combination thereof, but when the purpose is to impart heat resistance, monomers or oligomers such as polycarbonate and polyimide are used. All commercially available products can be used as the polymerization initiator, but benzoic peroxide (BPO) or azobisisobutylnitrile (AIBN) is preferably used, and is added in an amount of 1% or less based on the weight of the monomer.

(Example) Next, one embodiment of the present invention will be described.

As shown in Figure 1, the lower half of an annular torrefied rotary grindstone (2) with a grinding surface (1) formed on the upper side is inserted into the groove (4) of the annular set table (3), and the outer circumference A large number of monomer supply holes (5) are provided in the wall in the circumferential direction and communicate with the lower end of the outer peripheral surface of the rotating grindstone (2), and methyl methacrylate (MMA) is added at a weight ratio of 1% through these supply holes (5). AI
MMA monomer added with BN was forcibly injected and heated in a hot air circulation heated polymerization tank to produce a partially impregnated composite whetstone in which the lower half of the rotary whetstone (2) was made into a polymer composite layer (6).

In the same way, as shown in Figure 2, partially impregnated composite whetstones with a polymer composite layer (6) formed on the upper half of the human rift-fixed whetstone (1) were prepared, and each whetstone was attached to a Mascolloider and a joint frame test was carried out. When I did this, I got good results.

〔Effect of the invention〕

As described above, according to the present invention, the grinding surface of a grinding wheel for a joint frame machine is not impregnated with polymer to maintain cutting properties, and the non-cutting surface is sufficiently impregnated with polymer to prevent damage and to prevent damage to the upper and lower parts. Since the grinding wheel can be brought closer to the grinding wheel, cutting performance can be further improved, and the need for both safety and cutting performance can be met, which brings about remarkable industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the method of the present invention using a vitrified rotary grindstone, and FIG. 2 is a sectional view showing an embodiment of the polymer composite of the present invention using a vitrified fixed grindstone. 1... Grinding surface 2... Vitrified rotary grindstone 3...
・・・・・・Annular setting table 4・・・・・・Concave groove 5・・・・・・Monomer supply hole 6・・・・・・Polymer composite layer

Claims (2)

[Claims] (1) A partially impregnated grinding wheel polymer composite for a melting machine, characterized in that the internal pores of a porous vitrified grinding wheel for a melting machine, except for the vicinity of the grinding surface, are infiltrated and filled with thermoplastic and thermosetting polymers. . (2) On the non-grinding surface of a porous vitrified grinding wheel for a melting machine, thermoplastic or thermosetting plastic (synthetic resin) is applied from the wall pores located far from the grinding surface to the internal pores. A method for producing a partially impregnated grindstone polymer composite for a melter, characterized by forcibly injecting a monomer or its oligomer under reduced pressure or increased pressure, and polycondensing the impregnated monomer at a predetermined position using thermal energy.