JPH02243902A - Selection gage for parts feeder - Google Patents

Abstract

PURPOSE:To improve the wear resistance and selection efficiency by forming a part which is brought into contact with a body to be measured by using a ceramic sintered body. CONSTITUTION:The ceramic sintered body 12 is fitted to a gage main body 11 made of a metal and a space part 13 where a product passes is formed in the sintered body 12. Here, silicon nitride, silicon carbide, etc., are used as ceramic.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a sorting gauge used in a parts feeder.

(Prior Art) A parts feeder is a device that vibrates products to move them, and is widely used when producing small products in large quantities. It is also widely practiced to pass the product through a sorting gauge while moving the product using the parts feeder to determine whether the product conforms to standard dimensions.

2 and 3 show an example of a parts feeder. In the figure, 1 is a vibrating device, and 2 is a passage body. The passage body 2 is circular, and a spiral passage 3 is formed from the inner circumference side to the outer circumference side.

Then, when a small product is put into the center of the passage body 2 and the passage body 2 is vibrated by the vibration device 1, the product is vibrated and sequentially moves from the center of the passage body 2 through the passage 3 and exits. reach.

A sorting gauge 4 is provided at the outlet of the passage 3.

This sorting gauge 4 is gate-shaped, and a space corresponding to the standard size and shape of the product is formed inside, and a passage 3
In combination with this, it forms a tunnel through which the product passes.

That is, among the products moving through the passage 3, those smaller than the space of the sorting gauge 4 pass therethrough, while those larger cannot pass through and are removed from the passage 3 for sorting.

Conventional sorting gauges are made of metal materials such as stainless steel and tool steel.

(Problems to be Solved by the Invention) The following requirements are required for a parts feeder sorting gauge. That is, in the parts feeder, the products vibrate and move, so when the products pass through the sorting gauge, they pass while hitting the inner surface of the sorting gauge. For this reason, the sorting gauge is required to have wear resistance that can withstand the impact of products.

Furthermore, in order to increase the product sorting speed, it is required that the products can be moved smoothly.

However, conventional sorting gauges made of iron-based alloys do not fully meet these requirements.

The present invention was made based on the above-mentioned circumstances, and provides a sorting gauge for a parts feeder that is wear-resistant and allows smooth passage of products.

[Structure of the invention]

(Means and effects for solving the problems) The present invention has been made based on the above-mentioned circumstances, and is characterized in that the portion that contacts the object to be measured is formed of a ceramic sintered body.

The inventor has been conducting extensive research on sorting gauges for parts feeders. As a result of using a sorting gauge made of a ceramic sintered body in this process, when the product vibrates and passes through the sorting gauge, the product hits the surface of the ceramic sintered body, causing particles to be present on the surface of the ceramic sintered body. It was discovered that many thin protrusions were removed and the surface of the sintered body became smooth, and in this state the wear resistance was significantly improved.

It was also found that the sorting gauge made of a ceramic sintered body allows products to pass through it more smoothly and the number of products passing through it per unit time is greater than that of a sorting gauge made of an iron-based alloy. This is thought to be because the ceramic sintered body has a higher hardness than a product made of metal, and the surface of the sintered body is hard.

Furthermore, since the ceramic sintered body is a non-magnetic material, it has the advantage that products made of magnetic materials can be sorted without being influenced magnetically.

Therefore, it satisfies the selected requirements for ceramic sintered bodies.

The ceramics used to form the block gauge of the present invention include silicon nitride (Si3N4) and silicon carbide (Si3N4).
C), aluminum nitride (lN), alumina (A
N203) etc. are used. Silicon nitride is preferable because it can be easily obtained in a compact form, has little deformation, and has a small coefficient of thermal expansion, and silicon carbide is preferable because it has a high Young's modulus and has little deformation. In the case of silicon nitride, rare earth oxides such as Y2O3 (10% by weight or less) and A
It is preferable to obtain one containing N203 (10% by weight or less) or one with high density. In the case of silicon carbide, it is preferable to add B and C as sintering aids in order to increase the density. Aluminum nitride has both strength and high thermal conductivity.

Alumina has a coefficient of thermal expansion close to that of metal. Young's modulus is 2.3x 10 with little deformation for ceramics.
4 kgf/m4 or more is preferable.

As a method for obtaining the sorting gauge of the present invention, hot press (30C1~500kg/cd, 1700~1800
°C), pressureless sintering (1700-1800°C), atmosphere pressure sintering (10-100 kg/cJ, 1700-2000
℃) Hot hydraulic press (1000-3000 kg
/cd, 1700 to 1900°C), but in order to obtain a product with high density and a good surface, it is preferable to go through a pressing state at a high temperature, and each of the above-mentioned methods is suitable in this respect.

As a specific embodiment of the sorting gauge of the present invention, an example shown in FIG. 1 can be mentioned. That is, 11 is a gauge body made of metal, 12 is a ceramic sintered body attached to the gauge body 11, and this ceramic sintered body 12 has a space 13 formed therein for the product to pass through. In addition, 14
is a lid for closing the space 13.

Alternatively, the entire selection gauge may be formed of a ceramic sintered body.

(Example) Sintering aid (72035% by weight,
Silicon nitride powder containing A112032% by weight) was heated at a temperature of 1750°C and a pressure of 400 kg/cJ in a non-oxidizing atmosphere.
Hot press sintering was performed for 1 hour to obtain a sintered body. Thereafter, the sintered body was subjected to grinding and lapping, and further combined with a gauge body made of metal, the sorting gauge shown in FIG. 1 was manufactured. This sorting gauge is used to sort cathode ray tube parts made of electronic seals.
An inner space portion having a linear groove with dimensions corresponding to the projected cross-sectional shape of the component is formed inside.

Then, the sorting gauge was assembled to the parts feeder shown in FIGS. 2 and 3, and the parts feeder was driven to sort the products. The driving condition for the parts feeder is a frequency of 15.
00 times/min.

In addition, a sorting gauge with the same dimensions as above was manufactured using tool steel, and it was assembled to a parts feeder and products were sorted under the same conditions as above.

Here, the surface condition of the screening gauge of the present invention example and the screening gauge of the comparative example was determined by stylus type surface roughness A11 before use.
The surface condition was examined in the same manner as before use after 3600 minutes had elapsed after being assembled into a parts feeder and used for product sorting. The results are shown in FIGS. 4 to 8. 4 to 6 are diagrams showing the surface condition of the sorting gauge according to the present invention before and after use. That is, FIGS. 4 and 5 show the ceramic gauge before use, and FIG. 6 shows it after use. FIG. 7 and FIG. 8 are diagrams showing the surface condition of a comparative example selection gauge, that is, a tool steel gauge, before and after use.

According to these diagrams, there were many small protrusions on the surface of the sorting gauge according to the present invention before use, but 36 small protrusions were present after use.
After 00 minutes, these small protrusions are removed and the surface becomes smooth. This is because the product passing through the sorting gauge hits the inner surface of the gauge. Furthermore, it can be seen that even after 14,400 minutes, the smooth surface was hardly worn. This indicates that the screening gauge of the present invention exhibits excellent wear resistance with almost no wear when the surface is smooth. Also,
The surface of the sorting gauge of the comparative example was relatively smooth before use, but after 3600 minutes of use, it was significantly worn, indicating that the wear resistance was low.

In addition, the number of products passing through in 5 minutes was examined when both sorting gauges were used. However, all the products used were of acceptable quality. As a result, the sorting gauge of the invention example passed 1000 pieces, while the comparative example of the sorting gauge could only pass 680 pieces, and the product moved more smoothly with the one of the invention example, and the sorting speed was about 1. It turns out that it is .5 times as large.

〔Effect of the invention〕

As explained above, the parts feeder sorting gauge of the present invention has sufficient HP abrasion resistance to withstand the impact of all the regular products being vibrated and moved by the parts feeder, has a long life, and has a long lifespan. Items can pass through smoothly and sorting efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the sorting gauge of the present invention;
Figures 2 and 3 are explanatory diagrams showing the parts feeder, Figures 4 to 6 are lpj fixed water diagrams of the surface roughness of a sorting gauge made of ceramic sintered body, and Figures 7 to FIG. 8 is a diagram showing the measurement results of the surface roughness of a sorting gauge made of metal. 11... Gauge body, 12... Ceramic sintered body. Applicant's agent Patent attorney Takehiko Suzue] 4 Figures Figures Figures Figures Figures Figures Figures

Claims (1)

[Claims] A sorting gauge for parts feeders, characterized in that the part that comes into contact with the object to be measured is made of a ceramic sintered body.