JPS62148151A - Method and device for polishing finish of fork blade side of metal fork for table use - Google Patents

Abstract

PURPOSE:To obtain a high quality metal fork by polishing it through inserting thin plate typed grinding stones with elasticity and flexibility between respective adjacent fork blades. CONSTITUTION:A grinding stone G comprises the plural number of thin plate typed grinding stones with elasticity and flexibility and is inserted between adjacent fork blades 17 of a metal fork F and polishing is made by inclining the side of the fork blades 17 to the side of the grindstone. In this case, polishing is made such that the outer circumferential part of the grindstone is bent, following to the side of the fork blades 17 due to elasticity and flexibility of the grindstone, while it is stuck firmly to the side of the fork blades 17 for polishing. It comes from this that the polished face having uniform finishing, excellent outlook and high quality can be obtained. Furthermore, the grindstone with elasticity and flexibility is used, therefore it is possible to absorb effects of erroneous operation even if it is performed and thus to prevent damages to the grindstone.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for polishing and finishing the side surface of a fork blade of a metal fork for table use, for polishing and finishing the side surface of the fork blade of a metal fork for table use. It is related to the device.

In this specification, "polishing" refers to both polishing in the narrow sense of polishing the surface of an object to make it smooth, and grinding of slightly scraping the surface of the object to make it smooth. Furthermore, the term "grindstone" refers to a grinding/polishing tool that is used in rotation.

(Prior art) The manufacturing process of metal table forks consists of two steps: forming the dough using a press and polishing the surface of the dough using a huffing process.In the latter polishing process, the side surface of the fork blade is polished and finished. Various types of polishing work other than this work have been automated through the development of automatic polishing machines, resulting in excellent finished surfaces and improved productivity.

However, automation of polishing and finishing work on the side surfaces of fork blades is considered difficult. This is because the spacing between the fork blades is narrow and the shape of the fork blades is mainly curved.

Therefore, conventional polishing work for the side surface of the fork blade involves rough grinding by placing the side surface of the fork blade against the outer peripheral edge of a thin, hard cutting wheel that rotates at high speed, and then final polishing with endless coated abrasive paper.

For example, a fork with four blades has six polished surfaces, and a fork with three blades has four polished surfaces.With conventional polishing, one side of the fork blade must be polished one by one. Productivity is extremely poor.

Moreover, in conventional polishing work, a uniform polished surface can only be achieved by keeping the side of the fork blade in close contact with the side of the cutting wheel or the grinding surface of the endless coated abrasive paper with moderate force and not moving the fork back and forth. This is a work that requires extremely skill, and it is difficult for even a skilled person to continue this work for a long time. Moreover,
If the adhesion force of the fork blade to the cutting wheel or coated abrasive paper is incorrect, the side of the fork blade may be scraped too much, or the cutting wheel or coated abrasive paper may be damaged and scattered, which is extremely dangerous. .

Furthermore, with the conventional polishing method, there is a problem that the finished surface is poor in appearance and the quality of the fork is degraded, and there is also the problem that the number of skilled workers is decreasing in recent years and it is difficult to secure them.

(Problems to be Solved by the Invention) In view of the above-mentioned problems, the present invention has been made with the aim of improving the productivity and quality of metal forks for dining tables, as well as taking measures against the decrease in the number of skilled workers. be.

(Means for Solving the Problems) The present invention involves inserting a thin plate-like abrasive wheel having elasticity and flexibility between the fork blades of a metal fork, and placing the side surface of the fork blade against the side surface of the abrasive wheel. The side surface of the fork blade of a metal fork for table use is characterized in that the outer periphery of the grinding wheel is bent to follow the side surface of the fork blade by tilting the grinding wheel, and at the same time, the grinding wheel is brought into close contact with the side surface of the fork blade for polishing. A fork fixing device is equipped with a third servo motor on a reciprocating carriage that moves back and forth and left and right by the polishing method and the action of a first servo motor for back and forth movement and a second servo motor for left and right movement. It is attached so that it can swing freely in the left and right directions using a swinging mechanism, and a plurality of elastic and flexible polishing wheels corresponding to the number of fork blades of the metal fork are attached to the grindstone rotation axis at a pitch equal to the pitch of the fork blades. A polishing wheel device, which is attached so that the polishing wheel rotates in a vertical plane, is placed in front of the carriage, and each servo motor is numerically controlled to move the carriage back and forth and left and right, and the fork fixture is moved. This is a polishing and finishing device for the side surfaces of the fork blades of a metal dining fork, which simultaneously polishes the side surfaces of a plurality of fork blades of a fork fixed to a fork fixture by swinging it in the left and right direction.

(Example) FIGS. 1 and 2 show a fork blade side surface polishing device according to the present invention.

The two carriages 1a and lb intersecting at right angles are moved by arrows P and P' by a first servo motor M1 for forward and backward movement.
The upper carriage 1a moves forward and backward in the force direction in unison, and the upper carriage 1a moves left and right in the force direction along the arrows Q and Q' above the carriage 1b by the second servo motor M2 for left and right movement. It is supposed to be done.

Three fork fixtures 2 are attached to the swing mechanism A on the reciprocating table 1a.
The arrows R and R are respectively centered around the oscillating rotation axis 3.
It is mounted so that it can swing in the ' direction.

In this swing mechanism A, a ball screw 5 is supported by a bearing 4 fixed to a reciprocating table 1a, a left-right moving member 6 is screwed onto the ball screw 5, and three fork fixing devices are attached to both ends of a plate 7. The fork fixing devices 2 are respectively attached to the plate 7, and a third fork for left and right swinging is attached via a timing belt 8. servo motor M, and ball screw 5
The third servo motor M3 is connected to the third servo motor M3.
The left and right moving member 6 is moved left and right by rotating it forward and backward.

When the fork fixtures 2 are moved, each fork fixture 2 swings about the swing rotation shaft 3 in the directions of arrows R and R'.

Incidentally, the connecting portion of the fork fixing fitting of the left-right moving member 6 with the plate 7 is formed into a long hole so that linear motion can be converted into rotational motion.

For mounting the fork fixture, an air cylinder 9 for pressing and fixing the fork F placed on the fork fixture 2 is attached to the tip of the plate 7 via a bracket 10. A rubber presser 12 is attached to the tip of the iron 11 to prevent damage to the fork F when the presser is attached. A positioning member 13 is attached to the fork fixture 2 for positioning the fork F with respect to a polishing grindstone G, which will be described later.

Further, a grindstone device B is arranged in front of the carriage 1a.

This grinding wheel device B has three sets of three grinding wheels G attached to a grinding wheel rotating shaft L5 supported by a bearing 14 at intervals equal to the distance between the fork fixtures 2, and the grinding wheels G
can rotate in a vertical plane. The grindstone rotating shaft 15 is rotated by a drive motor M via a belt 16.

Each polishing whetstone G in the polishing whetstone G with 3 pieces 1 & Il
The pitch is equal to the pitch of the fork blades 17 of the fork F. The polishing wheel G is a thin plate having flexibility and elasticity.

In the above embodiment, since the fork F has four fork blades 17, the number of grindstones G is three (1) Jl, but in the case of a fork with three fork blades, 2
A set of polishing wheels is used.

Next, the polishing operation of the side surfaces 17a and 17b (FIG. 3) of the fork blade 17 of the fork F by the above-mentioned polishing device will be explained based on the motion analysis diagram of FIG. 4.

First, the drive motor M4 is started to rotate the polishing grindstone G, the carriage 1a is moved backward, the fork F is placed on each fork fixture 2, and the rod 11 of the air cylinder 9 is Press and fix the fork F using the holding tool 12 at the tip of the fork (Step ■). In this state, the first servo motor M is rotated forward at high speed to move the carriage 1a forward in the direction of arrow P at a relatively high speed until the tip of the fork blade 17 reaches just in front of the grindstone G (step ,■). Next, the first servo motor M1
When rotated forward at a low speed, the grinding wheel G enters between each of the fork blades 1"7 of the fork F, and when the grinding wheel G comes into contact with the root of the fork blade 17, the first
servo motor M.

stop the rotation (step ■).

Next, the second servo motor M2 is rotated forward and reverse to rotate the carriage 1.
By moving left and right alternately slightly, the tip of the polishing wheel G polishes the base of the fork blade 17, and at the same time lightly polishes both sides 17a and 17b of the fork blade 17 (steps ① to @). l). After that, the first
While rotating the second servo motor M in the forward direction to move the carriage 1a forward at a low speed in the direction of arrow P, the second servo motor M2
is rotated in the forward direction to move the carriage 1a to the left in the direction of the arrow Q at low speed, and the entire fork F is moved to the left by rotating the third servo motor M in the forward direction to move the left-right moving member 6 to the left. When the grinding wheel G is swung and tilted at a predetermined angle (10° to 30°) with respect to the side surface of the grinding wheel G (step ■), the outer periphery of each grinding wheel G is bent along one side surface 17a of each fork blade 17. At the same time, the bent polishing whetstone G comes into close contact with one side surface 17a of each fork blade 17. In the operation of step (2), each servo motor M1, M2, . The rotations of M3 are synchronized with each other.

Next, the rotation of each servo motor M, , M, M is stopped (step o), and when this state is left as it is for a predetermined period of time, the outer circumference of each grinding wheel G is attached to one side of each fork blade 17. Since it is bent following L7a and the bent polishing grindstone G is in close contact with one side surface 17a of each fork blade 17, one side surface 17a of each fork blade 17 is polished simultaneously and uniformly.

After a predetermined period of time has elapsed, the first servo motor M is reversely rotated to move the carriage 1a backward at a low speed in the direction of arrow P'', and the second servo motor M2 is rotated forward to move the carriage 1a back.
If you move further to the left in the direction of arrow Q (step @
), each fork blade 17 with the outer periphery of the polishing wheel G bent.
Since each fork blade I7 is in close contact with one side surface 17a of the fork blade I7, the fork F retreats diagonally rearward while one side surface 17a of each fork blade I7 continues to be polished.

Before the grindstone G is removed from between the fork blades 17, the first servo motor M1 is reversely rotated to move the carriage 1a backward, and the second servo motor M2 is reversely rotated to move the carriage 1a. While moving the fork to the right in the force direction of arrow Q', the third servo motor M3 is reversely rotated to move the entire fork F in the direction of arrow R.
'' direction to the right (step 0.0), the fork blade 17 comes out from between the grinding wheels G, and the fork F returns to its original position relative to the grinding wheels G (step [phase]).

This completes the polishing of one side surface 17a of each fork blade 17.

Next, when the first servo motor M is rotated in the forward direction again to move the carriage 1a forward (step ■), the grinding wheels G are inserted between the respective fork blades 17, and the grinding wheels G are inserted into the fork blades. 17 stops the rotation when it comes into contact with the root portion (step [phase]).

Thereafter, while the first servo motor M is rotated forward to move the carriage 1a forward at a low speed, the second servo motor M is rotated forward.
2 is reversely rotated to move the carriage 1a to the right in the direction of the arrow Q" at low speed, and the third servo motor M is reversely rotated to swing the entire fork F to the right, thereby moving the side surface of the grinding wheel G. When the grinding wheel G is tilted at a predetermined angle (10° to 30°) (step 0), the outer periphery of each grinding wheel G is bent along the other side surface 17b of each fork blade 17, and the bent grinding wheel G is is the other side 1 of each fork blade 17
Closely attached to 7b.

Next, each servo motor M + , M 2 . M:+
When the rotation of the grinding wheels G is stopped (step [phase]) and left in this state for a predetermined period of time, the outer circumference of each grinding wheel G is bent along the other side surface 17b of each fork blade 17, and the Since the polishing grindstone G is in close contact with the other side surface 17b of each fork blade 17, the other side surface 17b of each fork blade 17 is polished simultaneously and uniformly.

After a predetermined time has elapsed, the first servo motor M is reversely rotated to move the carriage 1a backward at a low speed, and the second servo motor M2 is reversely rotated to move the carriage 1a to the right (step @). Since the outer circumference of the grinding wheel G remains bent and is in close contact with the other side surface 17b of each fork blade 17, the fork F retreats diagonally backward while the other side surface 17b of each fork blade 17 continues to be polished. .

Before the grindstone G is removed from between the fork blades 17, the first servo motor M1 is reversely rotated to move the carriage 1a backward, and the second servo motor Mt is rotated forward to move the carriage 1a. While moving to the left, the third servo motor M3
When the fork F is rotated forward and the entire fork F is swung to the left (step 0.0>), the grinding wheel G is removed from between the fork blades 17, and the fork F returns to its original position relative to the grinding wheel G. (Step 0).

This completes the polishing of the other side surface 17b of each fork blade 17.

Thereafter, when the first servo motor M is rotated at a high speed in the opposite direction, the carriage 1a retreats at a relatively high speed and returns to the initial position (step 2).

In each of the above operations, each servo motor M1. Mz
.

The starting and stopping of M, as well as the direction and speed of rotation, are automated by numerical control.

Then, the polished fork F is removed from the fork fixture 2, the next fork F is attached, and the side surfaces 17a and 17b of the fork blade 17 are polished in the same manner as described above.

(Effects) (1) The method for polishing the side surface of the fork blade of the present invention uses a polishing wheel having elasticity and flexibility as a finishing tool, so the polishing wheel can polish the side surface of the fork blade, which is mainly curved. Since it bends freely following the shape, it is possible to obtain a high-quality polished surface with an excellent appearance and no uneven finish. During the polishing operation, the polishing wheel bends freely following the shape of the side surface of the fork blade, making it possible to absorb dimensional errors that occur during press molding.

Therefore, according to the finishing method of the present invention, it is possible to increase the commercial value of a metal dining fork.

In addition, since a polishing wheel with elasticity and flexibility is used as a finishing tool, even if there is a slight operational error, if it is within the allowable range, the polishing wheel will absorb it and cause damage to the polishing wheel. can be prevented.

(2) The fork blade side surface polishing device of the present invention has a fork mounted on a reciprocating table that moves back and forth and left and right by the action of a first servo motor for back and forth movement and a second servo motor for left and right movement. The fixture is attached so that it can swing freely in the left and right directions by a swinging mechanism equipped with a third servo motor, and a plurality of elastic and flexible polishing wheels corresponding to the number of fork blades of the metal fork are attached to the fork blades. A grinding wheel device, which is attached to the grinding wheel rotating shaft at a pitch equal to the pitch of , so that the grinding wheel rotates in a vertical plane, is placed in front of the carriage, and each servo motor is numerically controlled to move the carriage back and forth. Since the fork fixture is moved left and right and is also swung in the left and right directions, it is possible to polish the sides of the fork blades at the same time, significantly improving productivity. In addition, since a grinding wheel with elasticity and flexibility is used as a finishing tool, even if there is an operating error or malfunction of the device, the grinding wheel will absorb it as long as it is within the allowable range. Alternatively, it is possible to prevent the polishing stone from breaking.

In this way, the shortage of skilled workers can be addressed by significantly increasing productivity.

Furthermore, by attaching multiple sets of polishing whetstones to the whetstone rotating shaft at predetermined intervals, it is possible to simultaneously polish the side surfaces of the fork blades, and it is also possible to polish a large number of forks at the same time. Become.

[Brief explanation of drawings]

FIG. 1 is a plan view of a fork blade side polishing device according to the present invention, FIG. 2 is a partial perspective view of a fork fixture 2, and FIG. 3 is a perspective view of a metal dining fork F. , FIG. 4 is an operational analysis diagram of polishing the side surface of a fork blade according to the present invention. (Explanation of symbols of main parts) A: Swing mechanism B: Grinding wheel device F: Metal fork G: Grinding wheel Ml: First servo motor (for forward and backward movement) M2: Second servo motor (for left and right movement) M: Third servo motor (for rocking) 1a: Reciprocating table 2: Fork fixture 15: Grinding wheel rotation shaft 17: Fork blade

Claims (2)

[Claims] (1) A thin plate-shaped polishing wheel with elasticity and flexibility is inserted between the fork blades of a metal fork, and the outer periphery of the polishing wheel is A method for polishing the side surface of a fork blade of a metal fork for dining, characterized by bending the side surface of the fork blade to follow the side surface of the fork blade, and polishing the fork blade side surface with an abrasive stone in close contact with the side surface of the fork blade. (2) A fork fixture is mounted on a reciprocating table that moves back and forth and left and right by the action of a first servo motor for back and forth movement and a second servo motor for left and right movement. It is attached so that it can swing freely in the left and right directions using a moving mechanism, and a plurality of elastic and flexible polishing wheels corresponding to the number of fork blades of the metal fork are attached to the whetstone rotating shaft at a pitch equal to the pitch of the fork blades. A polishing wheel device in which a polishing wheel rotates in a vertical plane is placed in front of the carriage, and each servo motor is numerically controlled to move the carriage back and forth and left and right, and the fork fixture is moved in the left and right direction. A polishing finishing device for the side surface of a fork blade of a metal fork for a dining table, characterized in that the side surface of a fork blade of a metal fork for a table is simultaneously polished by swinging the side surfaces of a plurality of fork blades of a fork fixed to a fork fixture.