JPS6210374B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impact abrasion testing device in which the contact position between a test piece and an anvil that impacts the test piece constantly changes, thereby preventing fluctuations in wear conditions and improving reliability. The present invention relates to an impact abrasion testing device configured to be able to perform highly accurate impact abrasion testing.

The impact abrasion test is a test method in which a test piece is dropped against an anvil under a predetermined load, and the degree of wear of the test piece is examined by applying an impact, and is widely used for testing castings.

1 and 2 illustrate an example of a conventional device of this type. In both figures, the reference numeral 1 indicates a base, and an anvil 2 is fixed to a part of the upper surface of the base 1. ing. A lifting shaft 3 is arranged above the base 1 and facing the anvil 2. A weight 4 is attached to the middle of the lifting shaft 3, and a test piece 5 is fixed to the lower end of the lifting shaft 3.

The upper end of the lifting shaft 3 is continuous with a cam case 7 in which a cam 6 is housed. The cam 6 is fixed to a shaft 8, and a pulley 9 is fixed to one end of the shaft 8. A belt 13 is wound between the pulley 9 and a pulley 12 fixed to the output shaft of a reducer 11 connected to a motor 10. By the rotation of the cam 6 and the action of the cam case 7, the elevating shaft 3 is intermittently raised and dropped to create an impact between the test piece 5 and the anvil 2.

A bevel gear 1 is attached to the other end of the shaft 8 to which the cam 6 is fixed.
4 is fixed, and this bevel gear 14 meshes with another bevel gear 15 arranged horizontally.

The articulated arm 7 is connected to the bevel gear 15 via a universal joint 16 attached to its shaft.

A rotating arm 18 is attached to the lower end of the articulated arm 17, and a brush 1 is attached to the end of the rotating arm 18.
8a is provided.

Further, a hopper 19 is arranged above the base 1, and a material to be crushed 20 such as a mixture of river sand and carbon random is supplied into the hopper 19, and a weighing device 21 is provided below the hopper 19.
A predetermined amount of the material to be crushed 20 is placed on the anvil 2 by
are now being supplied.

Based on such a structure, an impact wear test is performed in the order shown in FIGS. 3A to 3D.

First, a predetermined amount of the material to be crushed 20 is supplied from the hopper 19 onto the base 1 using the weigher 21 . At this time, the lifting shaft 3 is in a raised position, and the test piece 5 is also in an upper position away from the anvil 2.

The object to be crushed 20 supplied onto the base 1 is pushed onto the anvil 2 by a brush 18a provided on the rotating arm 18, and the object to be crushed 20 is deposited on the anvil 2 to a predetermined thickness. This state,
It is shown in FIG. 3B.

Subsequently, as the cam 6 rotates, the lifting shaft 3 falls together with the weight 4, and the test piece 5 attached to the lower end of the lifting shaft 3 is exposed to the covered surface as shown in FIG. 3C. It suddenly collides with the anvil 2 via the crushed material 20. When this one impact test is completed, the lifting shaft 3 rises again, and the crushed powder on the anvil 2 is discharged into the powder storage section 22 by the other brush 18a of the rotating arm 18. To remove the crushed material 20 each time, the crushed material 20 with a predetermined particle size is always placed on the anvil 2, and
This is to make the conditions of the impact wear test uniform.

However, in the conventional structure as described above, the anvil 2 is fixed at a predetermined position on the upper surface of the base 1, and the elevating shaft 3 is provided so as to always fall to the same position on the anvil 2. .

As a result, the test piece 5 and the anvil 2 always come into contact at the same position, causing uneven wear on the contact surfaces.
The conditions will be different from when performing the impact wear test on the next test piece.

In other words, if a concave part is formed in the anvil 2 after performing a predetermined number of impact abrasion tests on one test piece, when testing the next test piece, the anvil with the concave part will be used from the beginning, and the test will be repeated. The conditions will be different.

In order to eliminate this inconvenience, it follows that the anvil also has to be replaced after each specimen.

As a result, the test work becomes extremely complicated and the wear test results become unreliable.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and its purpose is to provide a highly reliable impact wear test device that can always perform accurate tests under the same test conditions. It is said that

In order to achieve the above object, the present invention adopts a structure in which the anvil is formed into a ring shape and rotated at a predetermined speed so that the test piece can be tested under uniform conditions at all times.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIGS. 4 to 6 illustrate one embodiment of the present invention, and the reference numeral 25 in the figures is a rotary table, which is rotated via a shaft 26 by a motor (not shown) or the like. The rotation speed is, for example, 20 rpm or less.

An anvil 27 is fixed within the rotary table 25. The anvil 27 is formed into a ring shape,
Its cross-sectional shape is trapezoidal.

A cam disk 28 is mounted above the rotary table 25 so as to be rotated at a predetermined speed via a shaft 29. The rotational speed of the cam disk 28 is, for example, 20 to 80 rpm. Side wall 28 of cam disk 28
The upper edge of a is a cam surface, and the cam surface gradually becomes higher in the circumferential direction and suddenly becomes depressed at a certain point.
Moreover, it is gradually becoming higher.

A plurality of elevating shafts 30, for example four elevating shafts 30, are arranged on the same circumference with the rotating shaft 29 in between so as to be movable up and down and rotatable. A weight 3 is placed in the middle of the lifting shaft 30.
1 is fixed, and a test piece 32 is attached to the lower end facing the anvil 27.

Each weight 31 is in a position where it contacts the upper edge of the side wall 28a of the cam disk 28, and the test piece 32 is configured to rise and fall relative to the anvil 27 as the cam disk 28 rotates. There is. As shown in FIG. 4, the middle of each lifting shaft 30 is held by a guide plate 33 so as to be able to rise and fall freely.

A support shaft 34 is provided in the center of the guide plate 33 to protrude downward. As shown in FIG. 5, arms 35 are arranged at equal angular intervals at the lower end of the shaft 34, and brushes 36 are attached to the tips of these arms 35 so as to be in contact with the upper surface of the anvil 27. Furthermore, a scraper plate 38 is attached to the middle of each arm 35 or from the lower end of the shaft 34 to keep the thickness of the object 37 on the anvil 27 constant.

The rotary table 25 is filled with the material to be crushed 37 to the extent that the upper end of the anvil 27 is buried therein. The material to be crushed 37 is made of silica sand and clinker, and coarse powder or a part of the coarse particles are turned into fine powder for the impact test.

Next, the operation of the impact wear test apparatus according to the present invention configured as described above will be explained.

When the cam disk 28 is rotated while the rotary table 25 is being rotated, a plurality of lifting shafts are 30 are sequentially raised and then lowered, and the test pieces 32 attached to the lower end of each lifting shaft 30 collide with the anvil 27. The fallen test piece 32 is, for example, 3 to 15
It hits the anvil 27 through the object 37 to be crushed having a constant thickness of mm.

The lifting shaft 30 carrying the test piece 32 that has been subjected to one impact is sequentially lifted as the cam disk 28 rotates. At this time, due to the friction between the cam disk 28 and the weight 31, the weight 31 rotates a little, and the lifting shaft 30
The test piece 32 also rotates somewhat, and the attitude of the test piece 32 also changes somewhat.

During this time, since the rotary table 25 is rotating at a different speed than the cam disk 28, the brush 36, which is fixedly arranged, sweeps away the crushed material 37 generated by the impact, and then A scraper plate 38, which is fixedly arranged, always has the effect of sweeping the object 37 to be crushed onto the anvil 27 to a constant thickness.
Then, the next test piece 32 is dropped onto that part, and the same operation is repeated for several tens of hours.

What is crushed into fine powder by impact,
It is guided toward the bottom surface of the rotary table 25 as indicated by the reference numeral 37a. Coarse particles remain on the top side. This phenomenon is promoted by vibrations caused by the collision of the test piece 32 against the anvil 27 and the rotation of the rotary table 25.

As a result, there is always new, unpulverized, coarse-grained material to be crushed in the upper layer of the fine powder 37a in the rotary table 25, and the impact wear test is always performed using the new material to be crushed.

In addition, since the elevating shaft 30 is constantly rotating little by little due to friction with the cam disc 28, the contact surface of the test piece 32 with the rotating anvil 27 is constantly changing, and the contact surface of the test piece 32 and the anvil 27 is constantly changing. No uneven wear occurs.

In addition, when testing several test pieces, one of them shall be the standard test piece.

Further, since the anvil 27 is ring-shaped and has a trapezoidal cross section, the fine powder is easily guided below the rotary table 25 along the side surface of the anvil.

Furthermore, since the anvil 27 rotates together with the rotary table 25, the contact position between the test piece 32 and the anvil 27 is always different for each test, and tests cannot be performed at the same position.
There is no change in test conditions due to uneven wear, and tests can be performed under the same test conditions.

As is clear from the above description, according to the present invention, the anvil is formed into a ring shape, and a structure is adopted in which the anvil is rotated at a predetermined speed and the test piece is rotated and collided with the anvil. , the contact position between the test piece and the anvil changes constantly, making it possible to perform tests under uniform conditions.

In addition, the object to be crushed is pulverized by impact,
Since the pulverized material is always guided below the object to be crushed, the impact wear test can always be performed using a new object to be crushed, and the test conditions do not fluctuate.

[Brief explanation of the drawing]

Figures 1 to 3 show the conventional structure.
The figure is a front view, Figure 2 is a longitudinal sectional view, Figures 3A to 3D are operation explanatory diagrams, Figures 4 and 5 show one embodiment of the present invention, and Figure 4 is a longitudinal sectional view. , FIG. 5 is a sectional view taken along the line -- in FIG. 4. 25... Rotating table, 27... Anvil, 2
8...Cam disk, 30... Lifting shaft, 31... Weight, 32... Test piece, 33... Guide plate, 35...
Arm, 36...Brush, 37...Object to be crushed.

Claims (1)

[Scope of Claims] 1. A rotary table is installed such that the upper surface of an anvil formed in a ring shape is buried in the object to be crushed, a test piece can be attached to the lower end, and a weight is attached in the middle. An elevating shaft is provided in a position facing the upper surface of the anvil so that it can be raised and lowered and is rotatably provided, and a cam disc is rotatably provided in contact with a part of each of the elevating shafts and can raise and lower each elevating shaft. A scraping plate was installed to level the surface of the object to be crushed to a certain level before the test piece impacted the anvil, and a brush was installed to remove fine powder on the anvil that was generated by the impact of the test piece against the anvil. Impact wear test equipment. 2. The impact wear test device according to claim 1, wherein the ring-shaped anvil has a trapezoidal cross-sectional shape.