JPH0354833Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a landing detection device, and more specifically, when clamping a workpiece whose machining reference surface has a rough surface shape, the invention is applied to a landing reference metal for positioning the workpiece. The present invention relates to a landing detection device for accurately detecting landing of a workpiece and ensuring clamping of the workpiece.

2. Description of the Related Art When performing various processing on a workpiece formed by casting, such as an engine cylinder block, first, a reference notch hole is drilled in the cast workpiece to be used for positioning in a subsequent process. A work piece is set in a processing device for drilling this reference notch hole using a landing reference metal having a landing detection device incorporated therein.

FIGS. 2 and 3 show this type of conventional landing detection device. In FIGS. 2 and 3, reference numeral 1 denotes a workpiece in which a reference notch hole is drilled, and a machining reference surface 1a has a rough surface shape. Reference numeral 2 denotes a plurality of air nozzles installed at predetermined positions on the processing equipment via brackets 3, and reference numeral 4 denotes a landing reference metal used for positioning the workpiece 1 on the processing equipment. 2, and has an air blowing hole 5. 6 is an air source connected to each air nozzle 2 via an air hose 7 and a valve 8; 9 is a pressure switch that measures the pressure in the air path connecting each air nozzle 2 and the air source 6;

Then, on the contact surface 4a of the reference metal 4,
In order to detect whether or not the workpiece 1 whose machining reference surface 1a has a rough surface shape has landed accurately, first, the air source 6
At the same time, the pressure of the air applied to each air nozzle 2 at the time of this supply is measured by a pressure switch 9. Then, the machining reference surface 1a of the workpiece 1 is placed on the contact surface 4a of the landing reference metal 4.
When the workpiece 1 lands on the floor and the air blowing hole 5 is closed, the air pressure measured by the pressure switch 9 increases, and it is detected that the workpiece 1 has accurately landed on the landing reference metal 4.

In addition, there is another landing detection device described in Japanese Utility Model Application Publication No. 61-38508, which was proposed by the present applicant.

Problems to be Solved by the Invention The workpiece 1 set in the above-mentioned processing device remains in the cast state, and since the processing reference surface 1a is a black crust with a rough surface shape, the processing reference surface 1a has a convexity. When the part 10 comes into contact with the edge of the air blowing hole 5 of the landing reference metal 4, the air blowing hole 5 is closed, the air pressure increases, and the machining reference surface 1a of the workpiece 1 is brought into contact with the landing reference metal. However, when the recess 11 of the processing reference surface 1a faces the air blowing hole 5, the air blown from the air blowing hole 5 is detected to have landed accurately on the contact surface 4a of the machining reference surface 1a. The air pressure flows out from the formed rod to the outside, and the air pressure does not vary or rise.
There was a problem in that a detection error occurred even though the robot was accurately placed on the contact surface 4a, resulting in a delay in work.

Means for Solving the Problems The present invention was proposed in view of the above problems, and includes a landing reference metal for workpiece positioning, an air source for supplying air to the landing reference metal, and an air In a landing detection device equipped with a pressure switch for measuring air pressure supplied from a source to a landing reference metal, the landing reference metal is connected to a fixed reference metal having an air outlet and a workpiece. It consists of a movable reference metal having abutment for positioning, and the movable reference metal is supported elastically and oppositely to the fixed reference metal so that it can collide with the opening surface of the air blowing hole of the fixed reference metal. It is.

Operation When the movable reference metal is pressed by the workpiece, the movable reference metal collides with the fixed reference metal, completely closing the air blowing hole of the fixed reference metal. Therefore, when the workpiece securely lands on the landing reference metal, the air pressure supplied from the air source to the landing reference metal increases, becomes a constant value, and there is no variation, and the workpiece reaches the landing reference metal. Accurate implantation is detected. On the other hand, the pressing force of the workpiece is weak, and there is a gap between the fixed reference metal and the movable reference metal.
If there is a gap, the air ejected from the air outlet of the fixed reference metal will flow out through the gap, the air pressure will not increase, and the machining reference surface of the workpiece will land accurately on the landing reference metal. It is detected that you have not done so.

Embodiment An embodiment of the present invention will be described below with reference to FIG. 1. Furthermore, Figures 2 and 3
Components that are the same as those shown in the figures are designated by the same reference numerals, and description thereof will be omitted.

In FIG. 1, 21 is a landing reference metal used for positioning the workpiece 1, and this landing reference metal 21 is
A fixed reference metal 23 is held and fixed to the tip of the air nozzle 2 by appropriate means and has an air blowing hole 22 formed therein;
The movable reference metal 26 is supported in opposition to the smooth aperture surface 24 of No. 2 and has a smooth workpiece abutting surface 25 formed on its outer surface. A plurality of mounting recesses 27 are formed in the aperture surface 24 of the fixed reference metal 23, and a plurality of guide rods 28 are implanted therein. A plurality of guide holes 31 are formed in the abutting surface 29, facing the mounting recesses 27 and the guide rods 28, into which the plurality of mounting recesses 30 and the guide rods 28 are slidably inserted. 32 is each mounting recess 2 for the fixed reference metal 23 and the movable reference metal 26.
A plurality of elastic bodies housed and fixed in 7, 30, for example,
The elastic force of the compression spring 32 elastically supports the movable reference metal 26, which is guided and held by the guide rod 28, on the fixed reference metal 23.

Therefore, the workpiece contact surface 2 of the reference metal 21
5, a workpiece 1 in which the machining reference surface 1a has a rough surface shape
When detecting whether or not the air has landed correctly on the floor, it is necessary to supply air from the air source 6 to each nozzle 2 via the air hose 7 and valve 8, and at the same time pre-press the air that is applied to each air nozzle 2 at the time of this supply. Measurement is performed using the pressure switch 9. Then, the machining reference surface 1a of the workpiece 1 lands on the contact surface 25 of the movable reference metal 26, and the movable reference metal 26 is pushed while being guided by the guide rod 28 against the elastic force of the spring 32. , the abutment surface 29 is the fixed reference metal 2
When the air blowing hole 22 is closed by colliding with the opening surface 24 of No. 3, the air pressure measured by the pressure switch 9 rises to a predetermined value, and the workpiece 1 lands on the reference metal 21. Accurate implantation is detected. When the workpiece 1 securely lands on the landing reference metal 21 in this way, the air blowing hole 22 of the fixed reference metal 23 is closed, so the air pressure always remains at a constant value, and the landing of the workpiece 1 on the floor is detected reliably. It is possible.

Furthermore, if the workpiece 1 is not sufficiently pressed against the movable reference metal 26 when the workpiece 1 is placed on the floor,
The abutment surface 29 of the movable reference metal 26 does not abut the aperture surface 24 of the fixed reference metal 23, and the abutment surface 29 and the aperture surface 2
There is a gap between 4 and 4, so the fixed reference gold 23
The air ejected from the air blowing hole 22 passes through the gap and flows out to the outside, and the air pressure does not increase and the workpiece 1
It is detected that the metal has not landed on the landing reference metal 21.

In the above embodiment, the landing reference metal 21 is attached to the tip of the air nozzle 2, but the present invention is not limited to this, and the air hose 7 is attached to the fixed reference metal 23 of the landing reference metal 21 as appropriate. Alternatively, the air may be directly connected by a means to inject air from the air blowing hole 22.

Effects of the invention According to the invention, when the workpiece is firmly placed on the landing reference metal, the air pressure becomes a constant value and there is no variation. Implantation on the reference gold can be accurately detected. Therefore, equipment stoppages due to detection errors are eliminated, and the operating rate of the equipment line is improved.
It is possible to significantly improve work efficiency, and
When the work is carried into the processing device, it is possible to reliably prevent the work from being clamped in a misaligned state.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a landing detection device according to the present invention. FIG. 2 is a perspective view schematically showing a conventional landing detection device, and FIG. 3 is a longitudinal cross-sectional view of a main part thereof. 2... Air nozzle, 6... Air source, 9... Pressure switch, 21... Landing reference gold, 22...
Air blowing hole, 23...fixed reference metal, 24...opening surface, 25...work contact surface, 26...movable reference metal.

Claims (1)

[Scope of utility model registration request] Equipped with a landing reference metal for workpiece positioning, an air source for supplying air to the landing reference metal, and a pressure switch for measuring the air pressure supplied from the air source to the landing reference metal. In the landing detection device, the landing reference is composed of a fixed reference having an air blowing hole formed therein and a movable reference having a contact surface for positioning the workpiece, and the fixed reference has a movable reference. A landing detection device characterized in that a fixed reference gold is supported elastically and oppositely so as to be able to collide with the aperture surface of an air blowing hole.