JPH04112758U - Measurement position correction jig device - Google Patents

Abstract

(57) [Summary] [Purpose] A jig that can perform highly concentric machining by measuring the outer diameter of a workpiece while it is held and fixed on a jig, and then correcting the position of the jig using a numerical control device based on the measurement results. equipment. [Structure] A workpiece is placed and fixed on the V-shaped surface of a jig device equipped with a V-shaped measuring stand, and two measuring heads are provided with contacts at two positions that sandwich the workpiece on a straight line connecting the intersection of the V-shaped surface and the center of the workpiece. Each dimension from the reference position of the measuring table is measured using the method, and the measured values are input into the numerical control device. From the input values, calculate the outer diameter of the workpiece, the displacement e from the reference position of the measuring stand to the center of the measuring workpiece, the center of the measuring workpiece and the reference position of the measuring stand when the measured workpiece is placed in close contact with the V-shaped surface. By calculating the dimension e _L up to and comparing the displacement e and e _L , the degree of close contact of the workpiece to the V-shaped surface is determined, and the position of the jig device is corrected according to the output of the numerical control device.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a measurement position correction that corrects the position of the jig that holds the workpiece based on the measured value. Regarding jig devices.

0002

[Conventional technology]

When performing machining that requires concentricity to the outer diameter of the workpiece, conventionally the workpiece was centripetally How to perform centering with a chuck that has the same characteristics, and how to adjust the outer diameter to obtain the desired concentricity in the previous process. A method of processing by selecting only the workpiece and fixing the outer diameter of the workpiece to a fixed positioning jig. was used.

0003

[Problem that the idea aims to solve]

The method of centering the outer diameter of the workpiece using a centripetal chuck is based on the chuck manufacturing restrictions. The shape of the workpiece is often limited due to limitations, workpiece fixing methods, etc., and it lacks versatility. There is a problem in that, in order to obtain the desired concentricity in the previous process, the outer diameter of the workpiece must be measured. The method of selecting workpieces with an outer diameter within the allowable range and fixing the workpiece outer diameter is to place the workpieces on a jig. It is necessary to consider in advance the variation in setting when fixing the workpiece, so the outer diameter of the workpiece should be It is necessary to improve the accuracy by that amount. Another method is to perform high-precision positioning processing on the workpiece instead of measuring the outer diameter. Measures have been taken to increase the number of machining steps and create workpieces with higher machining accuracy than necessary. Ta.

0004 The present invention was made with the aim of solving the above-mentioned conventional problems. The aim is to create a shape that satisfies the function and to avoid adding more than necessary to make the workpiece accurate. It is an object of the present invention to provide a workpiece machining jig device that does not require machining or machining accuracy.

[0005]

[Means to solve the problem]

In order to solve the above problems, this invention requires concentricity on the V-shaped measuring stand fixed to the jig. On the straight line connecting the intersection of the V-shaped surface of the measuring table and the center of the workpiece, fixing the outer diameter of the workpiece. The measurement unit is equipped with a probe with contacts at two positions that sandwich the workpiece. The outer diameter part passing through the center of the work fixed on the fixed stand is measured for each change from the reference position of the measuring stand. The measured value is input to the numerical control device. The input signal determines the center of the workpiece from the outside diameter of the workpiece and the reference position of the measuring table. The displacement up to is calculated and the processing jig device is corrected and moved by this amount of displacement to allow the workpiece. This is a measurement position correction jig device that allows machining within concentricity.

[0006] In addition, if there is dust between the measuring table and the workpiece, the size of this dust can be determined by calculation. Calculate the distance between the measuring table and the workpiece, and if the value is within the allowable range, processing will begin. The jig device is moved to compensate for machining, and an alarm is issued if the value exceeds the allowable range. Measurement position correction jig with additional function that can stop the device by issuing a warning signal It is a device.

[0007]

[Effect]

The present invention consists of a workpiece in a ready-to-process state that is clamped through a V-shaped block on a jig. The displacement from the reference position of the measuring table is measured using two probes. Values are entered into the numerical control device. The input signal is measured by the calculation section of the numerical control device. The measured displacement from the outer diameter of the workpiece and the reference position of the measuring table to the center of the workpiece to be measured is e. Calculate.

[0008]Furthermore, the theoretical displacement amount e _L from the reference position of the measuring stand to the center of the workpiece is calculated in a state in which the outer diameter of the workpiece is in closer contact with the V-shaped measuring stand. In this way, the measured displacement amount e and the theoretical displacement amount e _L are compared, and if this value is within a preset range, it is determined that the clamping error is within the allowable value, and the jig position correction amount is moved by e.

[0009]

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. Figure 1 shows the measurement position correction jig A front view showing the configuration of the device, and Figure 2 is a side view showing the processing state of a workpiece using the device of the present invention. The top view and Figure 3 show the three positions of the workpiece placed on the measuring table and the center of the workpiece at that time. It is an explanatory view showing displacement.

0010 The measuring table blocks 1a and 1b are arranged in a V shape on the jig F, and the workpiece of the measuring table block is A dustproof air outlet 2 is provided near the contact area. 3 is an auxiliary guide block that guides the workpiece during clamping. H is clan 4 is a clamp piece fixed to the actuator. The workpiece W is moved through the clamp piece 4 by the measuring tables 1a and 1b and the actuator H. and fixed to jig F.

[0011] In this state, hold the workpiece on the straight line connecting the intersection of the V-shaped surfaces of the measuring table and the center of the workpiece. The measurement unit G equipped with the contact 7 of the measurement elements 5 and 6 at the position of the measurement element 5, The jig reference line m is a straight line that intersects perpendicularly to the straight line connecting 6 and passes through the center of the reference work. Measure the increase/decrease in distance from the tool reference line m and convert the values into electrical signals to perform numerical control. The calculation unit of the control device measures the outside diameter of the workpiece and the displacement of the jig reference line from the center of the workpiece. Calculate as displacement e.

0012 An output signal according to the calculated displacement e is output to the drive system of the shuttle unit S. When this happens, the shuttle unit that places jig F makes the desired position correction and places it on the workpiece. Machining units T waiting in orthogonal directions perform highly concentric machining. .

[0013] Note that the measuring unit G uses the air supplied from the air supply port 8 to control the measuring points 5 and 6. Lift the workpiece upward and rotate it to positions 5' and 6' as shown by the two-dot chain line. The structure is designed to avoid interference with the workpiece when attaching and detaching the workpiece.

Next, the measurement procedure will be explained using the explanatory diagram of FIG. Reference work When a workpiece with an outer diameter of 2r ₀ is placed in close contact with a V-shaped measuring table, the reference line passing through the center of the workpiece and perpendicular to the straight line connecting the measuring stylus 5 and 6 is defined as the jig reference line m. do. Assuming that the outer diameter of the workpiece is within the upper limit tolerance of 2r ₁ and the workpiece is measured with dust δ in between, the measuring unit G must have an outer diameter of 2r ₁ that is within the allowable range. and the displacement e from the jig reference line m to the center of the workpiece is measured.

Furthermore, within the numerical control device, the displacement from the jig reference line m to the center of the workpiece is calculated as the theoretical displacement amount e _L assuming that the workpiece having an outer diameter of 2r ₁ is in close contact with the measuring table.

By comparing the displacement e _L and e, the magnitude of δ is determined, and if this value is within a preset tolerance range, the position is corrected by the shuttle unit S, and if the value exceeds the tolerance value, a warning is issued. It emits a signal to stop the equipment. It goes without saying that even if the outer diameter of the workpiece to be measured exceeds the allowable value, a warning signal is issued and the apparatus is stopped.

[0017] A measuring table block is created by combining the above measuring unit G and numerical control device. The close contact between 1a and 1b and the work to be measured can be achieved even without installing a close contact confirmation sensor to confirm the close contact between the workpiece and the workpiece to be measured. This was achieved by using a measurement position correction jig device that allows the degree to be confirmed by calculation.

[0018] When the scissor angle of the V-shaped measurement stand is set to 60 degrees, e _L =2(r ₁ - r ₀ ) holds true. That is, since the displacement amount of the outer diameter and the displacement amount e _L of the center position are the same, the jig position can be corrected without calculation.

[0019]

[Effect of the idea]

As explained in detail above, according to the measurement position correction jig device according to the present invention, the same Measure the workpiece waiting to be processed in the station and position it based on the measurement results. Because of the correction, more accurate concentricity machining is possible without the presence of clamp errors. In addition, high-precision concentricity processing is possible without installing an expensive contact confirmation sensor on the measuring table. The degree of adhesion of the measurement workpiece to the measuring table and the roundness of the workpiece can be checked with a simple jig structure. It is now possible to quantify and display the included measurement errors.

[Brief explanation of drawings]

FIG. 1 is a front view showing the configuration of a measurement position correction jig device according to the present invention.

FIG. 2 is a side view showing a workpiece processing state using the apparatus of the present invention.

FIG. 3 is an explanatory diagram showing three different positions of the workpiece placed on the measuring table and the displacement of the center of the workpiece at that time.

[Explanation of symbols]

F Jig G Measurement unit H Clamp actuator S Shuttle unit T Processing unit W Workpiece m Jig reference line 2r ₀ Reference workpiece outer diameter e Measurement displacement amount 1a, 1b Measuring table block 2 Air outlet 3 Guide block 4 Clamp piece 5, 6 Measuring element 7 Contact element 8 Air supply port

Claims (2)

[Scope of utility model registration request] 1. A measurement position correction jig device that fixes a workpiece and includes a measuring tool for measuring the outer diameter of the workpiece, and a measurement position correction jig device that corrects the position of the jig using a numerical control device based on the measurement results. 2. In the apparatus according to claim 1, the degree of influence of a foreign object interposed between the workpiece and the measuring table is determined based on the calculation result based on the measured value, and the position of the jig is corrected when the measurement state is determined to be within an allowable range. Measurement position correction jig device with added function to perform.