JPH1098283A - Manufacture of precision equipment chassis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable ensuring precision, rigidity and strength by making a cam insert/eject a punch, and carry out work, while correcting a predetermined height from a reference plane to the surface of a mounting stage for each work. SOLUTION: A cam 7 is provided with 10 plus several stages of steps. By moving the cam 7 according to the measurement result of a previous process, the relation between a stripper insert 8 and a punch 5 is set to a predetermined correction height. Since a punch 9 of a lower unit is supported by a normal pressure generator 11, it presses a mounting stage, following the correction height, changing in accordance with the relation between the stripper insert 8 and the punch 5. With such a structure, the correction quantity is fed back on the basis of the measurement result of the height from a chassis reference plane to the surface of the mounting stage in the previous process. The cam 7 is made to insert/eject the punch 5, so as to switch the predetermined correction height for each chassis, and the periphery of the mounting stage is constrained to carry out the correction work. Thus, the chassis satisfies precision, rigidity and strength as a metal plate chassis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a chassis for various precision equipment such as a magnetic tape recorder (hereinafter referred to as a VTR) and a magnetic recording / reproducing apparatus such as a floppy disk drive and an optical apparatus such as an optical disk recorder. is there.

[0002]

2. Description of the Related Art A chassis for a precision device such as a VTR requires a high precision and rigidity in a mounting portion of an important part such as a cylinder head. The height accuracy is required to be ± 2/100. In addition, even if the rigidity and the strength are to support the rotationally driven cylinder head, it is required to be higher than the mounting part of other parts.

[0003]

Here, as a chassis for general use, a chassis made of sheet metal having a low manufacturing cost is frequently used. However, when such a sheet metal chassis is used for the above purpose, there is a problem not only in accuracy but also in rigidity and strength.

[0004] For this reason, die-cast products have conventionally been used for chassis for the above-mentioned applications. In this case, the thickness of each part can be made to correspond to the required rigidity and strength, and required precision can be ensured by performing precision cutting.

[0005] However, the necessity of cutting in addition to the die-cast product requires extremely high product cost. In the cutting process, dimensional irregularity is caused by wear of the tool, so that accuracy is maintained stable. Management is difficult, and furthermore, the processing of the shoulder is required.

Recently, Japanese Patent Application Laid-Open No. 6-291475 has been proposed.
There is a sheet metal chassis that has been corrected by high-spin plastic processing as seen in the manufacturing method of precision equipment chassis, but it is compression molding that crushes the surface of the mounting seat, and the flow of material affects the vicinity of the mounting seat and ensures accuracy Unstable.

[0007] The present invention has been made in view of such a point, and its object is to ensure the accuracy, rigidity and strength, and to manufacture a sheet metal chassis at low cost. An object of the present invention is to provide a method for manufacturing a chassis for precision equipment.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a press die for correcting a mounting seat portion protruding from one surface of a chassis formed of sheet metal. It is characterized in that processing is performed while correcting the height for each work.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, the lack of precision due to sheet metal processing is caused by restraining the periphery of the mounting seat and reshaping the mounting seat portion with a correction mold in which the height of the punch is corrected for each work. Accordingly, it is possible to increase the accuracy to a predetermined required accuracy. Further, unlike cutting and grinding, the thickness of the material is not reduced, so that the rigidity and strength are not reduced.

In performing the reshaping process, even if the punch height is changed by the cam, the receiving punch can be followed while being supported by the normal pressure generator, so that the thickness of the mounting seat portion is maintained without fluctuation. .

According to such a method, it is possible to use the method for improving the accuracy of the mounting portion of the important part in the sheet metal chassis without giving any distortion or deformation to portions other than the processed portion.

Hereinafter, the present invention will be described with reference to the illustrated embodiment. The chassis 1 shown in FIG. 5 is for a VTR, and is made of sheet metal by punching. A part of the chassis 1 is provided with an annular peripheral wall 2 by drawing and has an inclined surface portion 3 inclined at a predetermined angle. ing. A plurality of mounting seats 4 are provided on the upper surface of the inclined surface 3 at substantially equal intervals.

FIG. 1 shows a correction mold according to an embodiment. The punch 5 is held in a slidable state on the punch plate 6, and the positional relationship with the stripper insert 8 is changed by a cam 7 that corrects the measurement result. On the other hand, the lower punch 9 is a punch plate 1
0 is slidably held by the pad insert 12 and supported by the normal pressure generator 11.
It is attached to.

The operation of the straightening mold configured as described above will be described with reference to FIGS.

FIG. 2 shows the relationship between the punch 5 for correcting the height of the mounting seat 4 of the chassis 1 and the cam 7, and the cam 7 has ten or more steps T. By moving the cam 7 according to the measurement result of the previous step, the relationship between the stripper insert 8 and the punch 5 is adjusted to a predetermined correction height H.
Is set to

FIG. 3 shows a state of straightening processing.
When the press starts lowering, the stripper insert 8 and the pad insert 12 enter the state a in which the periphery of the mounting seat 4 is restrained.

As the descent proceeds further, the lower punch 9 comes into a state b in which the lower punch 9 hits the inner surface of the mounting seat 4. When the lowering further proceeds and a predetermined amount of straightening is completed, the state is changed to state C.

Since the lower punch 9 is supported by the normal pressure generator 11, the mounting seat 4 can be pressed by following the straightening height H that changes due to the relationship between the stripper insert 8 and the punch 5. The correction amount is 3/100 to 15/10
It is carried out within a range of 0 higher, and regulates the precision range of the press working in the previous process.

As described above, according to the present embodiment, the correction amount is fed back based on the measurement result from the chassis reference plane to the mounting seat surface in the previous process, and the punch is taken in and out by the cam to perform the predetermined correction. By changing the height for each chassis, and by performing a straightening process by restraining the area around the mounting seat, it does not affect the other parts of the chassis, ensuring accuracy as a sheet metal chassis and improving rigidity and strength Also, it is possible to provide parts having no problem.

[0020]

As described above, in the present invention, the lack of precision formed by sheet metal processing, which is advantageous in terms of manufacturing cost, is corrected by feeding back the measurement results for each work. It is possible to increase the accuracy required by the correction mold. Moreover, unlike cutting and grinding,
Since the thickness of the material is not reduced, rigidity and strength are not reduced. The manufacturing cost of the chassis can be greatly reduced because a product satisfying both the accuracy, rigidity and strength can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a straightening mold according to one embodiment.

FIG. 2 is a partial sectional view of a cam for setting a correction height.

FIG. 3 is a partial cross-sectional view showing each stage of straightening processing.

FIG. 4 is a partial sectional view showing another example of mounting seat correction.

FIG. 5 is a sectional view showing the overall shape of the chassis.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis 2 Annular peripheral wall 3 Inclined surface part 4 Mounting seat 5 Punch 6 Punch plate 7 Cam 8 Stripper insert 9 Punch 10 Punch plate 11 Normal pressure generator 12 Pad insert 13 Pad

Claims (1)

[Claims] 1. A press manufacturing method for correcting a height of a mounting seat portion protruding to one surface side of a chassis formed of a sheet metal, wherein a predetermined height from a reference surface to a surface of the mounting seat is caused by inserting and removing a punch with a cam. A precision device chassis, wherein the processing is performed while correcting the workpiece for each workpiece.