JPS5936394Y2 - Plate cutting equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an apparatus for cutting a plate into a circular shape.

When making circular accessories such as base plates and hole plates for key chains from plastic plates such as acrylic resin and melamine resin, it is difficult to punch out these materials, so we use a cutting tool to cut them. is taken.

In this case, conventionally, a plurality of stacked plates are held between the headstock and tailstock of the lathe, and while the plate is rotated, the cutting tools are alternately moved parallel to or perpendicular to the axis of rotation. A plastic disc of a predetermined diameter was obtained by sending the plastic disc.

However, when using a lathe in this way, it is difficult to hold the stacked plates between the headstock and tailstock, and the plates may become misaligned with each other during cutting. As a result, workability was poor and machining accuracy was also unsatisfactory.

This idea was made to improve the drawbacks of the conventional method, in which a single plate or multiple plates stacked on top of each other are rotated and lowered relative to a blade fixed in a fixed position.
Accordingly, the present invention aims to provide a plate material cutting device which is configured to cut a plate material into a circular shape using the above-mentioned cutter, so that the mounting of the plate material is easy and the processing accuracy is excellent.

Embodiments of this invention will be described below with reference to the drawings.

1 and 2, a circular upper plate 2 is provided integrally and concentrically at the upper end of a cylindrical cylinder 1 provided with an installation flange 1a, and this upper plate 2 A through hole 3 is provided in the center, and grooves 4a and 4b having a constant width and extending in the radial direction are provided at two locations sandwiching the through hole 3 on the upper surface of the upper plate 2.
A plurality of threaded holes 5a, 5b are formed at equal pitches along these grooves 4a, 4b.

A cylindrical piston 6 with an open bottom end is built into the cylinder 1 so as to be slidable up and down, and a rod portion 7 projecting from the center of its upper end surface is fitted into the through hole 3 .

Further, an elastic member 8 such as a coil spring installed inside the cylinder 1 has its upper half fitted inside the piston 6, and its lower end is received by a spring stopper member 9 fixed to the lower end opening of the cylinder 1. There is.

In this case, the elastic member 8 is subjected to a large compressive load (for example, 4
0 kg) is acting, and the reaction force (biasing force) presses the upper surface 6a of the piston against the lower surface 2a of the peripheral edge of the through hole 3, and the piston 6 is held at the upper limit position.

In the illustrated example, a circular recess 2b is formed around the through hole 3 on the upper surface side of the upper plate 2, and the annular felt 10 fitted into the recess 2b is screwed onto the upper plate 2. It is pressed and fixed to the upper plate 2 by a fixed press ring 11,
In this state, the inner peripheral part of the felt 10 bulges out and contacts the outer peripheral surface of the rod part 7.

Note that 12 indicates an air vent bored in the cylinder 1.

Next, as is clear from FIG. 3, a neck portion 13 having a smaller diameter is integrally provided on the upper end of the rod portion 7, and a stepped portion 14 is formed on the upper end of the neck portion 13. ing.

A thrust bearing 15 that receives a load in the axial direction and a radial bearing 16 that receives a load in the radial direction are attached to the lower part of the neck portion 13 and the stepped portion 14, respectively.

Here, the thrust bearing 15 and the radial bearing 16 are examples of a rotating member 17 attached to the upper end of the rod portion 7.

The receiving piece member 18 shown in FIG. 3 has a support surface 18a that supports a plate material P, which is a material to be cut, and a cylindrical portion 18b that is externally fitted onto the rotating member 17 without rattling.
has.

On the other hand, the pressing piece member 19 shown in FIG.
1 (see FIG. 1).

Here, the receiving piece member 18 and the pressing piece member 19 are a pair, and the diameter D1 of the plate support surface 18a and the diameter D2 of the plate material pressing surface 19a in the same pair are as follows. be the same, and have a diameter D1. The diameter is selected in advance to be smaller by a certain minute dimension than the diameter of the circular plate to be obtained by cutting D2.

Then, the outer peripheral surface 1 of the receiving piece member 18 and the pushing piece member 19 is
8C and 19C are the cylinder part 18b and the neck part 19, respectively.
It is formed concentrically with b.

Further, the inner circumferential diameter R of the cylindrical portion 18b is the same in each set of receiving piece members 18.

Incidentally, in the illustrated example, circular recesses 18d and 19d are provided on the upper surface of the receiving piece member 18 and the lower surface of the pushing piece member 19, respectively, but this is for the purpose of more securely holding the plate material P, and for centering, which will be described later. The diameters of these concave portions 18d and 19d are the same in the same set, and preferably the same in different sets.

Next, as is clear from FIG. 1 and FIG. It consists of b.

The fixing part 22a can be fitted into and removed from the grooves 4a and 4b of the upper plate 2, and can only slide in the longitudinal direction in the fitted state.
A concave groove 23 is formed on the bottom surface of a, and a long hole 24 is formed in the longitudinal direction thereof, and the tool rest 22 is inserted into the fixing bolt at an appropriate position in one of the grooves 4a using the screw hole 5a. 33.

Further, a fitting groove 26 for the cutting tool 25 is formed in the cutting tool mounting portion 22b, and the cutting tool 25 fitted in the cutting tool fitting groove 26 is formed in the cutting tool mounting portion 22b.
It is fixed with a set screw 27 with the cutter facing upward.

Next, the effect will be explained.

First, a receiving piece member 18 and a pressing piece member 19 having a plate support surface 18 a and a pressing surface 19 a having a diameter corresponding to the diameter of a circular plate to be obtained by cutting are selected, and the receiving piece member 18 is used as a rotating member. At step 17, the press piece member 19 is attached to a chuck provided on the main shaft 20 of the drilling machine 28.

These attachment procedures are clear from the above description.

Prior to this, or after this, as shown in FIGS. 1 and 6, the cylinder 1 is placed on the table 29 of the drilling machine 28, and the center alignment is performed using the method described below. It is fixed to the table 29 by the screws.

There are two methods for alignment.

One of them is as shown in FIG.
8 and the pressing piece member 19 are brought into contact with each other, and the outer peripheral surface 18 of each
C and 19C are flush with each other.

The other one is as shown in FIG.
A cylindrical body 31 for centering is fitted into the concave part 18d of 8 and made to stand upright, and the concave part 19d of the push piece member 19 is fitted into the upper end of this cylindrical body 31.

Further, the position of the tool rest 22 is adjusted so that the cutting edge of the cutter 25 is at a desired cutting dimension position.

In this case, the outer peripheral surface 18C of the cutter 25 and the receiving piece member 18
It is best to adjust the position by inserting a feeler gauge of a certain size between the two.

Thereafter, as shown in FIG. 1, a piece (plate material block) P in which one or more plates P are stacked is inserted between the receiving piece member 18 and the pushing piece member 19, and the receiving piece member 18
It is placed on the plate support surface 18a of the plate material support surface 18a.

Next, when the main shaft 20 is lowered and the pressing surface 19 a of the pushing member 19 is pressed against the upper surface of the plate block P, the plate block P is pressed against the downward pressing force by the pushing piece member 19 and the upward pressing force by the elastic member 8. It is reliably held between the receiving piece member 18 and the pushing piece member 19 by the pressing force.

In this state, when the drilling machine 28 is operated to rotate the main shaft 20, rotational force is sequentially transmitted to the chuck 21.degree. pushing piece member 19, plate block P, and receiving piece member 18, and these rotate together.

Therefore, when the handle 34 of the drilling machine 28 is operated to further lower the main shaft 20, the plate block P is lowered against the bias of the elastic member 8, and cutting is performed by the blade 25 in the process.

During cutting, the gap between the through hole 3 of the upper plate 3 and the rod portion 7 is closed by the felt 10, so that chips do not enter the inside of the cylinder 1.

In particular, during cutting, the gap between the blade 25 and the receiving piece member 18 or pressing piece member 19 is set to be very small, so even if the plate block P is made of plastic, frictional heat generated during cutting may cause This allows the deflection to be kept to a minimum, reducing factors that cause variations in product dimensions.

In this embodiment, only one cutter 25 is used, but depending on the shape of the plate material P, cutting may be difficult.

That is, if the external dimensions of the plate material P that is the raw material are larger than the diameter of the circular plate to be obtained by cutting, the plate material P will be cut into an annular shape as shown in FIG. In this case, if the thickness of the plate material P is large, it will not be possible to scrape it off with only the blade surface A of the knife 25, and the back part B, which is not the blade surface, will be removed from the plate material P.
There is a risk of coming into contact with.

In order to prevent such a situation, by using another groove 4b and attaching another cutter 25a at a position corresponding to the position indicated by the two-dot chain line in FIG. can be scraped off by the blade surface C of another blade 25a.

If a thicker plate material P is to be cut, a groove may be provided and another cutter may be attached thereto in the same manner as described above.

Further, in this embodiment, a drilling machine is used as the vertical main shaft that can be raised and lowered and can be rotated, but it is also possible to have a similar structure without using a drilling machine.

As described above, this invention consists of a cylinder that is integrally or integrally equipped with an upper plate in which a through hole is formed, and a rod part that is fitted into the through hole and built into the cylinder so as to be able to slide vertically. an elastic member installed in the cylinder so as to bias the piston upward; a tool rest fixed around the through hole on the plate; A knife with a blade facing toward the direction, a receiving piece member and a pressing piece member for vertically holding a plate material, the receiving piece member is rotatably and removably attached to the upper end of the rod part, and the pressing piece member is Since it is removably attached to a vertical main shaft that can be lifted and lowered and rotated, the plate can be attached by simply placing the plate between the receiving piece member and the pushing piece member in the vertical direction. This is easily done, and the plate material is reliably held by the biasing force of the elastic member even during cutting.

Furthermore, even during cutting, the blade is fixed, making it easy to set the initial dimensions of the blade and maintain that state, resulting in high machining accuracy.

Furthermore, since it can be configured using an existing drilling machine, it can be manufactured at low cost and the operating rate of the equipment can be increased.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a plate cutting device according to an embodiment of this invention, Fig. 2 is a view taken along arrows II to II in Fig. 1, Fig. 3 is a sectional view of the receiving piece member, and Fig. 4 Figure 5 is a cross-sectional view of the pressing piece member, Figure 5 is a cross-sectional view of the plate block showing cutting marks, Figure 6 is
The figure is a perspective view of the device in use, and FIGS. 7 and 8 are explanatory views during alignment. 1...Cylinder, 2...Top plate, 3...Through hole, 6
... Piston, 7... Rod portion, 8... Elastic member, 17... Rotating member, 18... Receiving piece member, 19...
・Pushing piece member, 20...Main shaft, 22...Turret, 25
...Knives.

Claims (1)

[Scope of utility model registration request] A cylinder integrally or integrally provided with an upper plate in which a through hole is formed, a piston built into the cylinder so as to be slidable up and down with a rod part fitted into the through hole, and an elastic member installed in the cylinder so as to be dynamically biased, a tool rest fixed around the through hole on the upper plate, and a cutter attached to the tool rest with the blade facing upward; It is equipped with a receiving piece member and a pushing piece member that hold the plate material in the vertical direction, and the receiving piece member is rotatably and removably attached to the upper end of the rod part, and the pushing piece member is vertically movable and rotationally driveable. A plate cutting device that is removably attached to the main shaft in the direction.