JPH0919851A - Workpiece location sensing device of workpiece finishing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of a defective workpiece by locating the workpiece correctly at all times, and thereupon applying machining work to the specified position on the workpiece. SOLUTION: Machining is started only when a workpiece W comes in contact with a locating means 7 which actuates an electrical continuity sensing means 13, and the machined workpiece W is discharged from a workpiece supporting tool 2, and if thereafter the sensing means 13 senses that the workpiece supporting tool 2 is in electrical continuity to the locating means 7, a stopping means 15 is actuated to stop the workpiece being machined, so that there is no risk of applying machining work to an unmachined workpiece which has not yet been located.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work position detecting device for a work processing machine, which is configured to perform machining on a work only when the work to be worked is positioned at a predetermined position.

[0002]

2. Description of the Related Art For example, as a centerless grinding machine in which an engine valve is positioned and a cotter groove is machined at a predetermined position of its shaft portion and a conventional positioning detection device, the applicant of the present application has already disclosed the invention. There is one proposed in Japanese Patent No. 76350.

In this conventional apparatus, a conductive horizontal rod-shaped positioning means, which is also electrically conductive, is arranged above one side portion of a vertically-arranged electrically conductive work supporting member so as to be electrically insulated from the work supporting device. The workpiece is positioned by bringing one end of a metallic engine valve (hereinafter simply referred to as a workpiece) mounted on the upper surface of the workpiece supporter into contact with the end of the positioning means. When the work is positioned at a predetermined position, the work simultaneously contacts the work support tool and the positioning means, and the work support tool and the positioning means are electrically connected. Therefore, by detecting this conduction state, it is considered that the work is positioned at a predetermined position, and the adjustment wheel and the grinding wheel that are movably arranged on both sides of the work support,
The cotter groove is machined at a predetermined position of the work by rotating it about the axis in the front-rear direction and moving it until it comes into contact with the work.

[0004]

In the above-mentioned conventional apparatus, for example, chips generated when a cotter groove is machined in a work are accumulated between the upper surface of the work support and the positioning means to support the work. When the tool and the positioning means come into contact with each other, the work support tool and the positioning means are electrically connected to each other, and the supplied unprocessed work is not in contact with the positioning means. Are considered to have been positioned in place.

If the machining of the work is started in such a state, the machining position of the cotter groove is deviated, and the machined work becomes a defective product.

The present invention has been made in view of the above-mentioned problems of the prior art, and by always positioning the work correctly, machining is performed at a predetermined position of the work. It is an object of the present invention to provide a work positioning detection device in a work processing machine, which is capable of preventing defective products from being generated in a work.

[0007]

According to the present invention, there is provided the above object, which comprises an electrically insulated work supporting member having conductivity and a positioning means, and is made of a metallic material placed on the work supporting member. By bringing one end of the work into contact with the positioning means, the work supporter and the positioning means are electrically conducted, and the conduction detecting means detects this to machine the work at a predetermined position. In the work processing machine described above, the discharge detection means for detecting that the processed work is discharged from the work support tool, and the discharge detection means after the work is discharged, the continuity detection means electrically connects the work support tool and the positioning means. And a stop means for stopping the working operation of the work when it is detected that the work is conducted.

[0008]

The operation is started only when the work is brought into contact with the positioning means and the conduction detecting means is actuated, and after the processed work is discharged from the work support, the work support and the positioning means are electrically connected. When the continuity detecting means detects that the work is being performed, the stopping means is activated to stop the work operation of the work. Therefore, there is no possibility that the unworked work that is not positioned is machined.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described with reference to an engine valve.
An embodiment applied to a centerless grinding machine for machining a cotter groove on a shaft portion of (W) (hereinafter referred to as a work) will be described with reference to the accompanying drawings. In the following description,
The right side of FIG. 1 and the lower side of FIG. 2 are referred to as the front, and the left side of FIG. 1 and the upper side of FIG. 2 are referred to as the rear side.

(1) is a substrate (bed) arranged in parallel with the floor surface, and a rectangular plate-shaped conductive work support (2) is erected on the front upper surface of the substrate (1). It is set up. The work support tool (2) is for mounting a work (W) to be processed, and its upper surface is a taper surface that is inclined to the opposite side to the grinding wheel described later.

Above the work support tool (2), a work transfer means (3) for placing an unprocessed work on the work support tool (2) is arranged so that it can be moved up and down. A base leg (4) is erected on the rear upper surface of the substrate (1), and a conductive air cylinder (5) is fixed to the upper surface of the base leg (4).

Piston rod (5a) of the air cylinder (5)
Is capable of projecting forward and is coaxial with the work (W) placed on the work support (2) at its tip through a conductive connecting plate (6), and its front end Part is work support
A conductive ejector (positioning means) (7) that can project above (2) is provided in a protruding manner (the figure shows an air cylinder (5)).
Indicates the maximum reduction time of). The work support tool (2) is electrically insulated from the ejector (7) and the air cylinder (5).

A work (W) is provided in front of the work support (2).
An air cylinder (8) that is coaxial with and is expandable in the front-rear direction is provided, and below it, a chute (S) that inclines downward to convey the processed work to the next processing work process or the like. Is provided. At the tip of the piston rod (8a) of the air cylinder (8), a loader head (9) that can rotate while contacting the umbrella surface (w2) of the work (W) is provided. It is possible to move between a maximum shortened position shown by a line and a maximum extended position shown by a solid line.

On both the left and right sides of the work support tool (2), by contacting a stop position spaced apart from the work support tool (2) and a work (W) placed on the work support tool (2). , Machining completion position where the cotter groove (w3) with the specified depth can be machined
(The state of FIG. 2) The adjustment wheel (10) and the grinding wheel (11) that can reciprocate between and around the axis that faces the front-back direction (the direction of the arrow in FIG. 2)
It is arranged to rotate. Adjusting wheel (10) axis of rotation
(10a) is slightly behind the axis in order to apply a thrust force to the work (W) in the ejector (7) direction when the work (W) placed on the work support (2) is contacted. It is tilted. A ridge (11a) for processing the cotter groove (w3) on the work (W) is provided on the outer peripheral surface of the grinding wheel (12).

Reference numeral (12) is a sequence control board whose negative electrode side (connection electrode) is connected to the base of the centerless grinding machine and the like, which is a work transfer means (3), front and rear air cylinders (5), (8), Sequence control is performed so that the adjusting wheel (10) and the grinding wheel (11) are operated in a predetermined order.

In the sequence control board (12), a continuity detection circuit (13) for detecting that the work support (2) and the ejector (7) are electrically connected to each other, and the work after processing are placed on the work support (2). )
When the continuity detection circuit (13) operates after the discharge detection circuit (14) and the discharge detection circuit (14) are activated, all sequences are detected by the operation of the air cylinder (5). A stop circuit (15) for stopping control is provided.

The positive electrode side of the sequence control board (12) is connected to each movable device such as the work transfer means (3).

Next, the operation of the above embodiment will be described. The work transfer means (3) supports the unworked work (W) with the work support tool.
When placed on (2), the front air cylinder (8) extends rearward, and the loader head (9) is brought into contact with the umbrella table (w2) of the work (W) while the work (W) is directly held. Move it backwards.
When the loader head (9) reaches the maximum extension position, the work
The shaft end of (W) contacts the ejector (7) to position the work (W), and the work (W) is ejected.
It is rotatably held by (7) and the loader head (10).

At this time, the work support (2) and the ejector (7), which have been electrically insulated from each other until then, are connected to the work.
It is electrically conducted through (W) and this is a sequence control board.
When the continuity detection circuit (13) in (12) detects, the cycle starts in a predetermined order.

When the adjusting wheel (10) and the grinding wheel (11) come into contact with the work (W), the work (W) is urged toward the ejector (7) side while rotating around the axis, so that the ejector (7) and The cotter groove (w3) is formed at a predetermined position of the shaft portion (w1) in the abutting state. When the adjusting wheel (10) and the grinding wheel (11) move to the preset processing completion position, the machining of the cotter groove (w3) is completed. Then, the adjusting wheel (10) and the grinding wheel (11) move in a direction away from the work (W), and at the same time, shorten the front air cylinder (8) and extend the rear air cylinder (5). By doing so, the work (W) is discharged forward and transferred to the chute (S).

As described above, the centerless grinding machine according to the present embodiment has the electrically-insulated work support (2) and the ejector.
Since the work (W) is processed after detecting that the work (W) and the work (W) are positioned at a predetermined position, the position of the cotter groove (w3) is displaced. There is no such thing.

After the discharge detection circuit (14) detects that the work (W) has been discharged, when the continuity detection circuit (13) is operating, the stop circuit (15) is operated to process the work. The work is stopped. Therefore, for example, when machining
The chips generated from (W) are used by the work support tool (2) and the ejector.
The work support (2) and the ejector (7) are electrically connected to each other due to accumulation between (7) and the work (W) is not actually positioned, Work (W)
It is prevented that the problem that the cycle start is started by assuming that is positioned is generated.

By doing so, machining is started only when the work (W) comes into contact with the ejector (7) and the continuity detecting circuit (13) is activated, and other than that, the continuity detecting circuit (13) is started.
When is activated, the stop circuit (15) is activated to stop machining, so there is no fear that machining will be performed without confirming whether it has been positioned, and an alarm will be issued when the stop circuit (15) is activated. By doing so, the worker can notice the abnormality of the centerless grinding machine, and therefore the defective work (W) is not sent to the next process.

Instead of providing the stop circuit (15), an air cylinder (16), which is expandable downward, is provided above the middle portion of the chute (S), and this is provided with a sequence control board (12).
After discharging the work, it is electrically connected to the continuity detection circuit (1
3) When the piston rod (1
6a) may be made to project so as to prevent the workpiece (W) machined without confirming whether or not it has been positioned from being sent to the next machining step.

[0025]

According to the present invention, since the work is brought into contact with the positioning means to confirm that the work has been positioned, the work is carried out, so that the predetermined position of the work can be accurately machined, which is not possible. There is no fear that good products will be produced.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a plan view of the main part of the same.

[Explanation of symbols]

 (1) Board (2) Work support (3) Work transfer means (4) Stand leg (5) Air cylinder (5a) Piston rod (6) Connecting plate (7) Ejector (positioning means) (8) Air cylinder ( 8a) Piston rod (9) Loader head (10) Adjusting wheel (11) Grinding wheel (11a) Ridge (12) Sequence control board (13) Continuity detection circuit (means) (14) Discharge detection circuit (means) (15) ) Stop circuit (means) (16) Air cylinder (16a) Piston rod (W) Work (w1) Shaft (w2) Umbrella table (w3) Cotter groove (S) Chute

Claims (1)

[Claims] 1. A work support tool having an electrically insulated and conductive property and a positioning means are provided, and one end of a metal work placed on the work support tool is brought into contact with the positioning means. In a work processing machine in which a work supporting tool and a positioning means are electrically connected to each other, and the conduction detecting means detects the electric conduction to machine a predetermined position of the work, the processed work is the work. Discharge detection means for detecting discharge from the support tool, and the discharge detection means after discharge of the work, when the work support tool and the positioning means have detected that the work support tool and the positioning means are electrically connected, A workpiece positioning detection device in a workpiece processing machine, comprising: a stopping unit configured to stop the processing operation of the workpiece.