JPH0451963Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an automatic finishing method for temporary assembly tabs that are used to maintain the shape during temporary assembly of various parts and are removed by polishing after assembly. Regarding grinding equipment.

[Conventional technology]

FIGS. 3 and 4 show a support grid product for a nuclear reactor fuel assembly, which is one of the parts assembled using the above-mentioned temporary assembly tabs.

This support lattice 1 is made up of a large number of band-shaped inner straps 2 arranged in a lattice shape at predetermined intervals and surrounded by band-shaped outer straps 3 arranged in a rectangular shape. Strap 2...,3
The fuel rods 4 and the guide tubes 5 inserted into the lattice spaces formed by the lattice spaces are supported respectively. The inner strap 2 of this support grid 1...
Two tongue-shaped tabs 6, 6 are formed at both ends of the straps, respectively, and the outer straps 3 are provided with tabs formed at both ends of the inner straps 2. A large number of elongated cutouts 7 are formed into which the cutouts 6 and 6 are respectively inserted. The support grid 1 is connected to the tabs 6 of the inner strap 2...
. . . are the cutout portions 7 of the outer strap 3, respectively.
It is temporarily assembled by inserting it inside and bending it slightly.

By the way, the support grid 1 temporarily assembled in this way is then spot-welded at each corner of the outer straps 3, and then the inner and outer corner straps 2...
All intersections of ..., 3... are brazed to each other to complete the assembly. Therefore, in this support grid 1, after the above-mentioned assembly is completed, the above-mentioned temporary assembly tabs 6... are not required, so these temporary assembly tabs 6... are not required before sending this support grid 1 to post-processes such as heat treatment. Tab 6... needs to be removed. For this reason, conventionally, after temporarily assembling the tabs 6..., the tabs 6... are first roughly ground with a belt grinder, and then the portions that remain protruding from the surface of the outer strap 3 are processed with a hand grinder until they are approximately flush with each other. It was removed by manual polishing.

[Problem that the invention attempts to solve]

However, the above-mentioned conventional finish grinding of the tab for temporary assembly relies exclusively on manual operations such as moving the support grid 1 and handling the above-mentioned hand grinder, which requires a large amount of man-hours and is extremely inefficient. It was hot. Moreover, if the outer strap 3 is ground too much by mistake, there is a risk that the surface of the outer strap 3 will be damaged by the hand grinder, so the amount of grinding tends to decrease. As a result, there has been a problem in that the amount of manual grinding increases, resulting in a large increase in the number of man-hours.

[Effect of idea]

This idea was made in view of the above circumstances,
The purpose of the present invention is to provide an automatic tab grinding device for temporary assembly that can achieve comprehensive labor savings in this type of grinding work by automating the final grinding of tabs for temporary assembly and controlling the amount of grinding during grinding. That is.

[Structure of the invention] The automatic tab grinding device for temporary assembly of this invention is provided with a movable table with a product mounted on its upper surface movably by a driving means on the bed, and the above-mentioned one on one side of the bed. A grinding wheel grinding mechanism is provided to perform finish grinding on the tab protruding from the surface of the product mounted on the movable table, and the grinding wheel of the grinding wheel grinding mechanism is supported and the grinding wheel is placed on the tab side of the product surface. a movable base and its drive source for moving the grinding wheel towards the tab; and a grinding control means for controlling the amount of grinding on the tab by controlling the amount of movement of the grinding wheel of the grinding wheel grinding mechanism toward the tab side, A first sensor is provided on the bed so as to be movable toward and away from the surface of the product at a height different from the tab position of the product, and detects the surface position of the product by coming into contact with the surface of the product; a second sensor provided on the bed or the movable base to detect the position of the grinding wheel;
a reference part that sets a reference position of the first sensor and the grinding wheel by bringing the first sensor and the grinding wheel into contact; the surface position of the product from the reference part detected by the first sensor; The grinding amount of the tab on the surface of the product is set based on the position of the grinding wheel from the reference portion detected by the second sensor.

〔Example〕

Figures 1 and 2 show an automatic finish grinding device for temporary assembly tabs of this invention (hereinafter abbreviated as the grinding device).
This is an example.

1 and 2, this grinding device includes a movable table 11 mounted with the support grid 1 and movably provided on the bed 10, and a grindstone provided on one side of the bed 10. Car grinding mechanism 13
and a grinding control means 15 for controlling the grinding of the support grid 1 by the grinding wheel grinding mechanism 13.

The moving table 11 is provided so that it can be moved by a minute amount on the bed 10 by a feed shaft 17 whose one end is connected to a stepping motor (driving means) 16. This moving platform 1
A turntable 18 is rotatably provided on the turntable 1, and the support grid 1 sandwiched between an upper plate 19a and a lower plate 19b is placed on the turntable 18. A fixing air cylinder 21 is provided above the upper plate 19a via a presser jig 20. This air cylinder 21 is connected to the turntable 18 of the moving table 11.
This air cylinder 2 is fixed to the tip of a rotation arm 22 that is rotatably installed on the side.
1, the support grid 1 is pressed downward and fixed onto the turntable 18. Further, a position sensor 23 is attached to the lower part of the movable base 11 for detecting the amount of movement of the movable base 11 with respect to the bed 10. The grinding wheel grinding mechanism 13 is provided on one side of the moving table 11 in the moving direction.

A bed 41 of this grinding wheel grinding mechanism 13 is provided in a direction perpendicular to the bed 10 of the movable table 11, and a base (a movable base) is mounted on the bed 41.
42 is provided so as to be movable forward and backward toward the bed 10 by a stepping motor (drive source) 42a. A support 43 is erected on the upper surface of the base 42 on the side of the bed 10, and a rotary shaft 44 is rotatably held inside the support 43. At the upper end of the rotating shaft 44 protruding from the support 43,
A large-diameter disk-shaped grinding wheel 45 is mounted horizontally on the movable table 11 so as to be at the same height as the support grid 1. Moreover, on the upper part of the above-mentioned pillar 43,
A protective cover 46 covering the grinding wheel 45 is attached. Furthermore, a mounting base 4 is attached to the support column 43.
7, a dresser 48 for the grinding wheel 45 is provided so as to be movable in the vertical direction and in the feeding direction by means of a vertical feed handle 49 and a feed handle 50, respectively. A motor 5 for driving the grinding wheel 45 is mounted on the upper surface of the base 42 in line with the support 43.
1 is fixed with its output shaft facing downward, and the output shaft of this motor 51 and the lower end of the rotating shaft 44 are connected to each other within the base 42.
The base 42 also has a bed 4 of the base 42.
A position sensor 52 is provided to measure the position of the grinding wheel 45 by detecting the amount of movement relative to the grinding wheel 45 . On the other hand, the bed 1 of the grinding wheel grinding mechanism 13
A support stand 53 is erected on the center side, and the grinding control means 15 is provided on this support stand 53.

This grinding control means 15 includes two sets of sensors (first sensors) 54 and 54 provided on the support table 53 and for detecting the surface position of the outer strap 3 of the support grid 1 on the movable table 11. , these sensors 5
4 and 54 integrally moving back and forth with respect to the support grid 1; and the position sensor 52.
(second sensor). Here, the mounting height of the two sets of sensors 54, 54 is as follows:
As shown by two-dot chain lines in FIG. 4, the heights are such that they face the upper and lower surfaces of the outer strap 3, which sandwich the tabs 6, 6 therebetween. The gap between these sensors 54, 54 is appropriately adjusted by an air cylinder 56 for adjusting the gap for each standard of the support grid to be ground. Further, the sensors 54, 5 are mounted on the side of the rotating arm 22 of the movable table 11 at the same height as the sensors 54, 54.
A monitor strap (reference part) 57 for setting the reference point of No. 4 is arranged opposite to the monitor strap. and,
The grinding device constructed as described above is installed in a dust-proof hood case (not shown) with a dust-proof tact.

Next, the operation of the above-mentioned grinding device will be explained below.
First, after turning on the main switch of the operation panel (not shown) of the grinding device provided outside the hood case, the standard of the support grid 1 to be ground is designated by the switch on the operation panel. As a result, the interval between the two sets of sensors 54, 54 for detecting the surface position of the outer strap 3 of the support grid 1 is set to the interval specified by the air cylinder 56. Next, after placing the support grid 1 held between the upper and lower plates 19a and 19b on the turntable 18 on the movable table 11, the turntable 18 is held down by the holding jig 20 and the air cylinder 21.
Fix it on top and close the door of the food case.

Next, the grinding wheel 45 and the sensors 54, 54
At the position where both of the grinding wheels are retracted from the bed 10, the movable table 11 is manually moved toward the grinding wheel grinding mechanism 13, and the monitor strap 57 is positioned on the center line of the grinding wheel 45. Then, similarly, the grinding wheel 45 is manually moved toward the monitor strap 57, and the reading of the position sensor 52 is reset to 0 at the position where the grinding wheel 45 and the monitor strap 57 come into contact. Next, move the moving table 11 to attach the monitor strap 57 to the sensors 54 and 5.
Adjust to measurement position 4. and air cylinder 5
5 causes the sensors 54, 54 to protrude toward the monitor strap 57, and the measured value of the monitor strap 57 is reset to the reference value of 0. As a result, the position sensor 52 of the grinding wheel 45
The reference points of the reading by the sensor 54 and the reading by the sensors 54, 54 coincide with each other. In this state, the automatic operation switch of the grinding wheel grinding mechanism 13 on the operation panel is turned on. Then, the motor 51 rotates the grinding wheel 45, and the movable table 11 moves on the bed 10 toward the grinding wheel grinding mechanism 13. On the other hand, in parallel with this, the sensors 54, 54 detect the surface position of the upper and lower parts of the outer strap 3 on the respective tabs 6, 6, as shown in FIG.
Measure at each pitch. Then, the sensor 5
Among the measured values of the upper and lower parts of the outer strap 3 by 4 and 54, the value obtained by adding a predetermined safety amount to the measured value of the one protruding toward the grinding wheel 45 side is the amount of grinding by the grinding wheel 45 on each tab 6, 6. The information is stored for each of the above tabs 6, 6. Next, the moving table 11 further moves on the bed 10 and stops at a position where the first tabs 6, 6 of the support grid 1 are on the center line of the grinding wheel 45. Then, the grinding wheel 45 moves the bed 41 toward the support grid 1 by the stepping motor 42a, and performs finish grinding of the memorized amount of grinding on the tabs 6, 6 after rough grinding. Then retreat once. Then, the above-mentioned grinding wheel 45 is moved again by the above-mentioned movable table 11.
When the second tabs 6, 6 are positioned at the grinding position and stopped, the second tabs 6, 6 are similarly finished ground by the memorized amount and then retreated again. In this way, the above series of operations is repeated for each tab 6, 6, and the support grid 1
When finish grinding of all the tabs 6 on one side is completed, the moving table 11 moves to the center of the bed 10 again. Then, after the turntable 18 rotates 90 degrees at the center of the bed 10, the movable table 11 moves again toward the grinding wheel grinding mechanism 13, and thereby the second surface of the support grid 1 is Finish grinding is carried out in a similar manner. Then, the above operation is repeated, and the support grid 1
When the final grinding of the third and fourth surfaces is completed, the movable table 11 returns to the center of the bed 10, and the automatic operation by the grinding wheel grinding mechanism 13 is stopped.
Next, the support grid 1 on the movable table 11 is removed from the turntable 18 after visually inspecting the ground tabs 6 . . . and sent to a subsequent process. The grinding wheel 45 is appropriately dressed by the dresser 48 when switching between automatic and manual operation of the grinding device.

According to such a grinding device, the finish grinding of the tab 6 by the grinding wheel grinding mechanism 13 can be performed by
It can be processed automatically without any manual effort. In addition, a stepping motor 16 is used as a driving source for the movable table 11, and in combination with this, the upper and lower positions of each tab 6, 6 of the outer strap 3 are measured by sensors 54, 54, and based on this, each tab 6 is , 6, the final grinding is performed with a predetermined safety value in mind, so that the maximum possible final grinding can be performed for each tab 6 without damaging the outer strap 3.

In the above embodiment, the temporary assembly tab 6 in the support grid 1 of the reactor fuel assembly is shown as an example of the temporary assembly tab to be removed by grinding, but the present invention is not limited to this. According to this grinding device, it is possible to remove such temporary assembly tabs from various parts by grinding.

[Effect of idea]

As explained above, in the automatic tab grinding device for temporary assembly of this invention, a movable table with a product mounted on the upper surface is provided on the bed so as to be movable by a driving means, and the above-mentioned A grinding wheel grinding mechanism for finishing grinding the tab protruding from the surface of the product mounted on the movable table is provided, and the grinding wheel of the grinding wheel grinding mechanism is supported and the grinding wheel is placed on the tab side of the product surface. A movable base and its drive source for moving the grinding wheel toward the tab, and a grinding control means for controlling the amount of grinding of the tab by controlling the amount of movement of the grinding wheel of the grinding wheel toward the tab side, A first sensor is provided on the bed so as to be movable toward and away from the surface of the product at a height different from the tab position of the product, and detects the surface position of the product by coming into contact with the surface of the product; A second sensor provided on the bed or movable base to detect the position of the grinding wheel is brought into contact with the first sensor and the grinding wheel to set the reference position of the first sensor and the grinding wheel. and a reference part for determining the grinding amount of the tab on the surface of the product based on the surface position of the product from the reference part detected by the first sensor and the position of the grinding wheel from the reference part detected by the second sensor. is configured so that it is set. Therefore, according to the automatic finish grinding device for temporary assembly tabs of this invention, finish grinding of various temporary assembly tabs using a grinding wheel grinding mechanism can be automatically performed without any manual effort. Moreover, the grinding control means allows maximum finish grinding to be performed without causing damage to anything other than the object to be ground. Therefore, it is possible to achieve comprehensive labor savings in this type of grinding work.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the automatic finish grinding device for temporary assembly of this invention.
The figure shows a schematic front view, Fig. 2 shows a schematic front view, Figs. 3 and 4 show a support grid for a nuclear reactor fuel assembly, which is one of the objects to be ground, and Fig. 3 shows a schematic assembly. 4 are enlarged views of the part to be ground. 1... Support grid, 6... Tab, 10... Bed, 11... Moving table, 13... Grinding wheel grinding mechanism,
15... Grinding control means, 16... Stepping motor (drive means), 18... Turntable, 2
3...position sensor, 45...grinding wheel, 52...position sensor, 54...sensor, 57...monitor strap.

Claims (1)

[Scope of Claim for Utility Model Registration] An automatic tab grinding device for temporary assembly that grinds and removes tabs protruding from the surface of a product, which comprises a movable table movably installed on a bed and on which a product is mounted. , a grinding wheel grinding mechanism disposed on one side of the bed and performing finish grinding on a tab protruding from the surface of a product mounted on the moving table; and a grinding wheel grinding mechanism that directs the moving table toward the grinding wheel grinding mechanism. a driving means for a movable base that supports the grinding wheel of the grinding wheel grinding mechanism and moves the grinding wheel toward the tab side of the product surface; and a grinding control means for controlling the amount of grinding on the tab by controlling the amount of movement of the grinding wheel of the mechanism toward the tab side. a first sensor that is provided on the surface of the product so as to be movable toward and away from the surface of the product and detects the surface position of the product by coming into contact with the surface of the product; and a first sensor that is provided on the bed or the movable base and is provided on the surface of the product to detect the position of the grinding wheel; a second sensor that detects
a reference part that sets a reference position of the first sensor and the grinding wheel by bringing the first sensor and the grinding wheel into contact; the surface position of the product from the reference part detected by the first sensor; An automatic finish grinding device for tabs for temporary assembly, characterized in that the amount of grinding of the tabs on the surface of the product is set based on the position of the grinding wheel from the reference part detected by the second sensor.