TWI512264B - Workpiece detecting method and the method used by an assisted detection fixture - Google Patents

Description

Workpiece detecting method and auxiliary detecting fixture used by the method

The invention relates to a workpiece detecting method and an auxiliary detecting jig used by the method, in particular to a workpiece detecting method for detecting the size of a workpiece to be tested and an auxiliary detecting jig used by the method.

The existing workpiece is usually ground by a grinding process, and the workpiece is transported to the quality inspection area for grinding the inclined angle of the inclined surface. At present, the detection method is to contact the workpiece in a contact manner by a scalar measuring machine (CMM), and the inclination angle of the inclined surface of the workpiece is obtained by measuring the multi-point data of the workpiece and performing angle conversion. The coordinate measuring device compares the measured value with the pre-stored design reference value. If the measured value exceeds the tolerance of the design reference value, the workpiece is transported back to the grinding processing area to finish the bevel. After the finishing and polishing is completed, the workpiece is transported back to the quality inspection area, and the coordinate measuring machine measures the inclination angle of the inclined surface of the workpiece after the finishing grinding. If the value measured by the coordinate measuring machine still exceeds the tolerance range of the design reference value, the workpiece shall be transported back to the grinding processing area for finishing grinding; if the measured value is within the tolerance of the design reference value, ie Finish the quality inspection of the workpiece and send the workpiece to the next process.

If the measured value obtained by measuring the workpiece by the coordinate measuring machine exceeds the tolerance range of the design reference value, the workpiece needs to be sent back to the grinding stage for finishing grinding, and then sent to the quality inspection area for testing after being ground, usually The workpiece is to be reciprocated several times between the quality inspection area and the grinding processing area until the value measured by the coordinate measuring machine is within the tolerance of the design reference value. As a result, the working time of the workpiece to and from the grinding processing zone and the quality inspection zone is increased, which leads to an increase in the number of manufacturing steps of the workpiece. In addition, the measurement of the inclination angle of the workpiece bevel by the coordinate measuring machine increases the purchase cost of the coordinate measuring machine.

Therefore, it is an object of the present invention to provide a workpiece detecting method which can easily, quickly and accurately detect the size of a workpiece to be tested, and can greatly shorten the inspection man-hour and the manufacturing man-hour of the workpiece to be tested.

Therefore, the workpiece detecting method of the present invention comprises the steps of: providing a step of providing an auxiliary detecting fixture comprising a positioning surface, a circular arc surface and a measuring plane adjacent to the circular arc surface; and assembling steps The auxiliary detecting fixture is assembled on a workpiece to be tested, such that the positioning surface of the auxiliary detecting fixture abuts against a reference surface of the workpiece to be tested, and the circular arc surface of the auxiliary detecting fixture abuts against the a slope of the workpiece to be tested adjacent to one end of the reference surface; a measuring step of measuring a vertical distance between the measuring plane of the auxiliary detecting fixture and a measuring reference portion of the workpiece to be tested Measuring value; and comparing the determining step, comparing the measured value with a reference value, According to a comparison result, it is judged whether the size measurement of the workpiece to be tested is qualified.

Another object of the present invention is to provide an auxiliary detecting fixture which is simple in structure and manufacturing method and can be assembled and positioned on the workpiece to be tested conveniently and quickly to assist in detecting the size of the workpiece to be tested.

Therefore, the auxiliary detecting fixture of the present invention is suitable for being assembled on a workpiece to be tested, the workpiece to be tested includes a reference surface, and a slope adjacent to one end of the reference surface, the auxiliary detecting fixture includes a positioning block and a Reach the block.

The positioning block includes a positioning surface for abutting against the reference surface; the abutting block protrudes from the positioning surface and includes a circular arc surface for abutting against the inclined surface, the positioning block is defined together with the abutting block A measurement plane adjacent to the arc surface is formed.

The effect of the invention lies in that the workpiece detecting method of the embodiment enables the worker to conveniently, quickly and accurately detect the size of the workpiece to be tested on the grinding machine table, and can greatly shorten the inspection working time and the manufacturing work of the workpiece size to be tested. Time. In addition, the structure and manufacturing method of the auxiliary test fixture are simple, and the purchase cost of the test equipment can be greatly saved.

1‧‧‧Workpiece to be tested

100‧‧‧ Design basis workpiece

10‧‧‧Measurement reference section

11‧‧‧Datum

12‧‧‧ plane

13‧‧‧Slope

14‧‧‧ surface

15‧‧‧imaginary plane

200‧‧‧Auxiliary test fixture

2‧‧‧ fixture body

21‧‧‧ Positioning block

211‧‧‧ positioning surface

212‧‧‧ surface

213‧‧‧ Groove

214‧‧‧ Extended imaginary

22‧‧‧Receive block

221‧‧‧Cylinder

222‧‧‧ arc surface

223‧‧‧Arc imaginary surface

23‧‧‧Measurement plane

3‧‧‧ Magnet

C‧‧‧Connected imaginary line

D‧‧‧ total length of workpiece

L‧‧‧ reference value

L’‧‧‧ measured value

L1‧‧‧ vertical distance

L2‧‧‧ vertical distance

O‧‧‧The center of the cylinder

P1‧‧‧ intersection

P2‧‧‧ intersection

P3‧‧‧ intersection

R‧‧‧ radius of the cylindrical part

θ ‧‧‧ angle

α ‧‧‧ angle

S1‧‧‧Provide steps

S2‧‧‧ Calculation of the reference value step

S3‧‧‧ Assembly steps

S4‧‧‧Measurement steps

S5‧‧‧ comparison judgment step

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is an exploded perspective view of a workpiece to be tested and an auxiliary inspection fixture according to an embodiment of the workpiece detecting method of the present invention. Describe the assembly relationship between the workpiece to be tested and the auxiliary inspection fixture; FIG. 2 is a flow of the detection method of an embodiment of the workpiece detection method of the present invention; 3 is a side view of a design reference workpiece and an auxiliary inspection jig according to an embodiment of the workpiece detecting method of the present invention, illustrating that the auxiliary detecting jig is assembled on the design reference workpiece; FIG. 4 is a partial enlarged view of FIG. 3; FIG. 5 is a side view of the workpiece to be tested and the auxiliary inspection jig according to an embodiment of the workpiece detecting method of the present invention, illustrating that the auxiliary detecting jig is assembled on the workpiece to be tested.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

1 is an embodiment of a workpiece detecting method according to the present invention. The workpiece 1 to be tested in the embodiment is described by taking a metal mold as an example. The workpiece 1 to be tested includes a reference surface 11 and two planes 12 and Two slopes 13. The reference plane 11 is a vertical plane, and each plane 12 is a horizontal plane. One ends of the two inclined surfaces 13 are respectively adjacent to the upper and lower ends of the reference surface 11, and the other ends of the two inclined surfaces 13 are respectively adjacent to one ends of the two planes 12.

During the grinding process of the workpiece 1 to be tested, the worker responsible for grinding the workpiece 1 to be tested first grinds the reference surface 11 and the two planes 12 on the workpiece 1 to be tested, so that the vertical between the reference surface 11 and the surface 14 The distance within the tolerance of the design dimension and the vertical distance between each plane 12 and a gauge base 10 of the workpiece 1 to be tested are within the tolerances of the design dimensions. The measurement reference portion 10 of the present embodiment is, for example, a position at which the tip end of the workpiece 1 to be tested (or the bottom end of the workpiece 1 to be tested) is half of the total length D. The reference imaginary plane of measurement. After the reference surface 11 and the two planes 12 are finished, the workpiece 1 to be tested is clamped by a clamp (not shown) to be positioned at an inclined position to perform the grinding of the slope 13 on the workpiece 1 to be tested. It should be noted that the workpiece 1 to be tested may also be other workpieces having a slope and having to be tested for the size after grinding, not limited to the mold.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , FIG. 2 is a flowchart of a workpiece detecting method according to the embodiment, which includes the following steps: providing step S1, calculating a reference value step S2, assembling step S3, measuring step S4, and comparing Step S5 is judged.

In the providing step S1, an auxiliary detecting jig 200 is provided, which comprises a jig body 2 and a magnet 3. The jig body 2 is made by an integrally formed manufacturing method, and includes a positioning block 21 and an abutting block 22. The positioning block 21 of the present embodiment is, for example, rectangular in shape, and includes a positioning surface 211 and a surface 212 opposite to the positioning surface 211. The positioning surface 211 and the surface 212 are respectively a vertical plane, and the surface 212 of the positioning block 21 is A groove 213 is formed in the direction of the positioning surface 211. The magnet 3 is a strong magnet that is caught in the recess 213. The positioning block 21 is magnetically attracted to the reference surface 11 through the magnet 3, whereby the positioning surface 211 can be firmly abutted and positioned on the reference surface 11.

Referring to FIG. 1 , FIG. 3 and FIG. 4 , the abutting block 22 is protruded from the positioning surface 211 of the positioning block 21 and adjacent to a short side of the positioning block 21 . The abutting block 22 includes a cylindrical portion 221 , and the cylindrical portion 221 has a cylindrical portion 221 . The circular arc surface 222 is used to abut against the to-be-detected inclined surface 13 of the workpiece 1 to be tested. The cylindrical portion 221 defines a circular arc imaginary surface 223 that is connected to the circular arc surface 222. The circular arc surface 222 of the present embodiment and the circular arc imaginary surface 223 form a circular shape. Positioning The block 21 and the abutment block 22 together define a measuring plane 23 adjoining the top end of the circular arc surface 222. The measuring plane 23 is parallel to the measuring reference portion 10 and is used for measurement by a worker.

The size of the inclined surface 13 of the workpiece 1 to be tested may vary depending on the size of the workpiece 1 to be tested. Therefore, in the providing step S1 of the embodiment, the worker is based on the inclined surface 13 and the corresponding plane 12 of the workpiece 1 to be tested. The distance between an intersection point P1 and an intersection point P2 between the slope 13 and the reference plane 11 is selected for use of the auxiliary inspection jig 200 having the cylindrical portion 221 having an appropriate diameter. When the distance between the intersection point P1 and the intersection point P2 is large, the auxiliary detection fixture 200 having the larger diameter cylindrical portion 221 is selected; when the distance between the intersection point P1 and the intersection point P2 is small, the smaller diameter is selected. The auxiliary portion 200 of the cylindrical portion 221 detects the jig 200, whereby the accuracy of detection and the flexibility and flexibility of use can be effectively improved.

Referring to FIG. 2, FIG. 3 and FIG. 4, when the worker selects the appropriate auxiliary inspection jig 200, the calculation of the reference value step S2 is performed. The calculation of the reference value step S2 is based on the relevant dimensions indicated by the side view of the auxiliary inspection fixture 200 assembled on the design reference workpiece 100, and the calculation of the reference value L is performed. The workpiece 100 refers to a workpiece having a known design size in the workpiece design drawing. The positioning surface 211 of the positioning block 21 abuts against the reference surface 11 of the design reference workpiece 100. The positioning block 21 defines an extended imaginary surface 214 extending upward from the top end of the positioning surface 211 and coplanar therewith, extending the imaginary surface 214 and the cylindrical portion The arc imaginary plane 223 of 221 is tangent, and the positioning surface 211 and the extended imaginary plane 214 are perpendicular to the measurement plane 23, respectively. Further, the arcuate faces 222 of the cylindrical portion 221 of the block 22 are respectively It is tangent to the inclined surface 13 and the measuring plane 23. The reference value L is obtained by a conversion formula: L=L1+L2+r

In the above conversion formula: L is the reference value.

L1 is the vertical distance between the intersection P2 between the slope 13 of the design reference workpiece 100 and the reference plane 11 and the measurement reference portion 10.

L2 is the vertical distance between the intersection P3 between the arc imaginary plane 223 and the extended imaginary plane 214 and the intersection P2 between the slope 13 of the design reference workpiece 100 and the reference plane 11.

r is the radius of the cylindrical portion 221.

θ is the angle between the inclined surface 13 of the design reference workpiece 100 and an imaginary plane 15 parallel to the measurement plane 23, wherein the imaginary plane 15 of the present embodiment is a horizontal plane extending from the intersection point P1 and coplanar with the plane 12 example. Of course, the imaginary plane 15 may also be a horizontal plane intersecting the slope 13 and located between the intersection point P1 and the intersection point P2, or a horizontal plane extending from the intersection point P2.

α is an angle between a connecting imaginary line C and the positioning surface 211 or the inclined surface 13 of the design reference workpiece 100, and the connection imaginary line C is connected to the center O of the cylindrical portion 221 and the intersection P2 between the inclined surface 13 and the reference surface 11.

The conversion formula of this embodiment is calculated by a computer software, for example, Excel. The staff can input the L1 design value and the θ design value of the design reference workpiece 100 into the computer operation software in the workpiece design drawing, and then select the auxiliary inspection fixture. The value of the radius r of the cylindrical portion 221 of 200 is input to the computer operation software, and the reference value L can be obtained by conversion of the conversion formula.

Referring to FIG. 2 and FIG. 5, in the subsequent assembly step S3, the selected auxiliary detecting jig 200 is assembled on the workpiece 1 to be tested, and the positioning surface 211 of the positioning block 21 is abutted against the reference surface 11 of the workpiece 1 to be tested. And the arcuate surface 222 against the block 22 abuts against the to-be-measured slope 13 of the workpiece 1 to be tested. The magnet 3 is magnetically attracted to the reference surface 11 so that the positioning surface 211 and the circular arc surface 222 can be firmly abutted and positioned on the reference surface 11 and the inclined surface 13, respectively.

Next, in the measuring step S4, the measuring plane 23 of the auxiliary detecting jig 200 and the measuring reference of the workpiece 1 to be tested are measured by a measuring instrument (not shown) such as a dial gauge or a dial gauge. The vertical distance between the portions 10 to obtain a measured value L'.

Subsequently, in the comparison judging step S5, the comparison measurement value L' and the reference value L (Fig. 4) are used to judge whether or not the size measurement of the workpiece 1 to be tested is qualified based on the comparison result. When the equivalent measured value L' coincides with the reference value L and is within the tolerance range of the reference value L, it is judged that the size of the workpiece 1 to be tested is qualified, that is, the inclined angle of the inclined surface 13 of the workpiece 1 to be tested and the θ design in the workpiece design drawing. The values match. When the equivalent measured value L' does not match the reference value L, it is judged that the size of the workpiece 1 to be tested is unqualified. The condition that the aforementioned measured value L' does not match the reference value L generally means that the measured value L' is larger than the reference value L, and therefore, the worker needs to perform the finish grinding of the inclined surface 13 of the workpiece 1 to be tested. After the grinding of the inclined surface 13 is completed, the assembly step S3, the measuring step S4, and the comparison determining step S5 are again performed to detect the size of the workpiece 1 to be measured until the measured value L' coincides with the reference value L and is located at the reference value L. Up to the tolerance range.

In summary, the workpiece detecting method of the present embodiment provides the step S1, the calculation reference value step S2, the assembly step S3, the measuring step S4, and the comparison determining step S5, and the matching detection detecting tool 200. The auxiliary enables the worker to easily, quickly and accurately detect the size of the workpiece 1 to be tested on the grinding machine table, which can greatly shorten the inspection man-hour of the workpiece 1 to be tested and the manufacturing man-hour thereof compared with the prior art. In addition, the structure and manufacturing method of the auxiliary detecting jig 200 are simple, and compared with the manner in which the prior art detects the workpiece 1 to be tested through the coordinate measuring machine, the purchase cost of the detecting device can be greatly saved, so that the present invention can be achieved. purpose.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

1‧‧‧Workpiece to be tested

10‧‧‧Measurement reference section

11‧‧‧Datum

12‧‧‧ plane

13‧‧‧Slope

14‧‧‧ surface

200‧‧‧Auxiliary test fixture

2‧‧‧ fixture body

21‧‧‧ Positioning block

211‧‧‧ positioning surface

212‧‧‧ surface

213‧‧‧ Groove

22‧‧‧Receive block

221‧‧‧Cylinder

222‧‧‧ arc surface

23‧‧‧Measurement plane

3‧‧‧ Magnet

D‧‧‧ total length of workpiece

Claims (12)

A workpiece detecting method comprising the steps of: providing a step of providing an auxiliary detecting fixture, comprising: a positioning surface, a circular arc surface and a measuring plane adjacent to the circular arc surface; and an assembling step, the auxiliary detecting The jig is assembled on a workpiece to be tested, such that the positioning surface of the auxiliary detecting fixture abuts against a reference surface of the workpiece to be tested, and the circular arc surface of the auxiliary detecting fixture abuts against the workpiece to be tested a bevel adjacent to one end of the reference surface; a measuring step of measuring a vertical distance between the measuring plane of the auxiliary detecting fixture and a measuring reference portion of the workpiece to be measured to obtain a measured value And comparing the determining step, comparing the measured value with a reference value, and further determining whether the size of the workpiece to be tested is qualified according to a comparison result. The workpiece detecting method according to claim 1, wherein in the providing step, the auxiliary detecting jig includes a positioning block having the positioning surface, and a protrusion protruding from the positioning surface and having the arc surface By means of the block, the positioning block and the abutting block together define the measuring plane, the measuring plane being parallel to the measuring reference part. The workpiece detecting method according to claim 2, wherein the inclined surface is tangent to the circular arc surface, the abutting block defines an arc imaginary plane connected to the circular arc surface, and the positioning block defines a one end of the positioning surface An extended imaginary plane extending out and coplanar with the arc imaginary plane is tangent to the arc imaginary plane. The workpiece detecting method according to claim 3, wherein the abutting block comprises a cylindrical portion having the circular arc surface and the arc imaginary surface, the arc surface and the arc imaginary surface together forming a a circular shape, the positioning surface, the extended imaginary plane are respectively perpendicular to the measuring plane, the measuring plane is tangent to the circular arc surface, and the workpiece detecting method further comprises a calculation reference between the providing step and the assembling step In the value step, the reference value is obtained by a conversion formula: L=L1+L2+r L is the reference value, L1 is the vertical distance between the intersection between a slope and a reference plane of a design reference workpiece and a measurement reference portion, and L2 is between the arc imaginary plane and the extension imaginary plane a vertical distance between the intersection point and the intersection between the inclined surface of the design reference workpiece and the reference surface, r is a radius of the cylindrical portion, and θ is an angle between the inclined surface of the design reference workpiece and an imaginary plane, The imaginary plane is parallel to the measuring plane, and α is an angle between a connecting imaginary line and the inclined surface of the positioning surface or the design reference workpiece, the connecting imaginary line is connected to the center of the cylindrical portion and the inclined surface and the reference surface The intersection between. The workpiece detecting method according to claim 4, wherein in the providing step, the distance between the inclined surface of the workpiece to be tested and a plane and the intersection between the inclined surface and the reference surface are Size, the auxiliary test fixture of the cylindrical portion having an appropriate diameter is selected for use. The workpiece detecting method according to claim 1, wherein in the assembling step, the reference surface of the workpiece to be tested has magnetic properties, and the auxiliary detecting fixture Magnetizing on the reference surface through a magnet disposed on the positioning block. The workpiece detecting method according to claim 1, wherein, in the comparing determining step, when the measured value matches the reference value, determining that the workpiece to be tested is qualified for inspection, and the measured value and the reference are If the value does not match, it is judged that the size of the workpiece to be tested is unqualified. An auxiliary detecting fixture is adapted to be assembled on a workpiece to be tested, the workpiece to be tested comprises a reference surface, and a slope adjacent to one end of the reference surface, the auxiliary detecting fixture comprises: a positioning block comprising a positioning surface for abutting against the reference surface; and An abutting block is protruded from the positioning surface and includes a circular arc surface for abutting against the inclined surface, and the positioning block and the abutting block jointly define a measuring plane adjacent to the circular arc surface. The auxiliary detecting jig according to claim 8, wherein the inclined surface is tangent to the circular arc surface, the abutting block defines an arc imaginary plane connected to the circular arc surface, and the positioning block defines a positioning surface An extended imaginary plane extending from one end and coplanar with the end, the extended imaginary plane being tangent to the arc imaginary plane. The auxiliary detecting jig according to claim 9, wherein the positioning surface and the extended imaginary plane are respectively perpendicular to the measuring plane, and the measuring plane is tangent to the circular arc surface. The auxiliary detecting jig according to claim 10, wherein the abutting block comprises a cylindrical portion having the circular arc surface and the arc imaginary surface, and the circular arc surface and the arc imaginary surface are combined A round shape. The auxiliary detecting jig according to claim 8, wherein the reference surface of the workpiece to be tested has magnetic properties, the positioning block is formed with a groove, and the auxiliary detecting jig further comprises a magnet stuck in the groove. The positioning block is magnetically attracted to the reference surface through the magnet.