JPS6227295Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a buffer spring for various pressure molding molds such as presses and injection molding.

(Prior Art) As shown in FIG. 1, a conventional shock absorber includes a stacked disc spring 50 that is loosely fitted directly onto a mounting shaft 53 between a mold 51 and a base 52. The required buffer function is met.

(Problems that the invention attempts to solve) However, although it has such a structure, it includes the following problems. In other words, the mold is replaced according to each molded product, but each disc spring comes apart each time the mounting shaft is attached and removed during the replacement process, and each time, each disc spring must be replaced with a loose fit on the mounting shaft. This is what we are doing. This troublesome work not only prevents quick replacement of the mold and is unproductive, but also causes problems as it may even cause some pieces of the disc spring to break apart.

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a buffer spring that can be reliably attached and detached at one time.

(Means for Solving the Problems) In order to achieve the object, the present invention is characterized in that a cylindrical holder is provided with disc springs in a stacked manner to form a unit.

More specifically, the mounting shaft is inserted into a through hole in the mold holder in the buffering direction of the mold, leaving an enlarged shaft head with a larger diameter than the same hole diameter, and connecting the mold holder and the mounting shaft. In a pressure molding shock absorbing spring that is attached to the mounting shaft portion between the mold and the mold to which the protruding shaft end is attached, the outer diameter is smaller than the hole described above, and the enlarged shaft head on the mounting shaft is A cylindrical holder that is loosely fitted to the shaft body between the shaft end and a cylindrical holder that is loosely fitted to the outer periphery of the cylindrical holder in an overlapping manner in the axial direction and is prevented from coming off by stoppers at both ends of the holder. The present invention is characterized in that the buffer spring for a pressure mold is configured to include a disc spring positioned between a mold holder and opposing surfaces of the mold so as to be able to cushion the mold.

(Function) A disc spring is loosely fitted into a cylindrical holder and formed into a unit. By fitting the mold loosely from the shaft end and then attaching the mold to the end of the shaft, the mold can be set at once between the mold holder and the mold in a state where it can be buffered by the disc spring. .

In the set state, the cylindrical holder of the buffer spring is movable integrally with the mounting shaft, and the stacked disk springs establish a buffering relationship for the mold.

(Example) An example of implementation of the present invention will be described in detail below based on the drawings.

2 to 6 illustrate the buffer spring C of the present invention.

In the figure, 1 is a cylindrical holder, 2 is a collar, 3... is a disc spring, and the cylindrical holder 1 has a diameter that allows the mounting shaft A to fit loosely, and the outer diameter is larger than the hole B ₄ of the mold B, which will be described later. A stopper 1a is bulge-molded at one end of the outer peripheral surface of the small-diameter cylinder, while a retaining ring-shaped stopper 1c is fitted into an annular groove 1b near the other end. The collar 2 and the disc spring 3 are loosely fitted in a stacked manner, and the stopper 1a,
The collar 2 and disc spring 3 can be removed by removing the retaining ring-like stopper 1c.

The collar 2 has a roughly bowl-shaped cross section, and its annular tip edge 2
a is formed at a height that protrudes from the other surface of the cylindrical holder 1 even when it is in contact with the retaining ring 1c and is prevented from coming off, so that when the mold surface of the mold B wears out,
The annular tip edge 2a is cut to correspond to the wear height of the mold surface so that it can be adjusted to the height of the mold surface.

The disc spring 3 is of a normal form, and is loosely fitted together with the collar 2 on the outer peripheral surface of the cylindrical holder 1, and is movable in the axial direction.

Next, a usage condition in which the buffer spring C of the present invention is provided in a mold B in a press machine will be explained.

Fig. 7 shows an embodiment in which a mold holder B 3 is provided between the lower mold B ₁ side and the mold holder B ₃ in the mold B of the complete punching type, and the mold is formed when the molded product C is press-formed by the upper mold B ₂ . It cushions and supports the lower mold _B1 .

Specifically, the mounting shaft A is attached to the hole _B4 that is penetrating in the buffer direction of the lower mold _B1 in the mold holder _B3 .
_{The mold holder B 3 and} the protruding shaft end A ₂ of the mounting shaft A are attached by leaving the enlarged shaft head A ₁ with a larger diameter than the same hole B 4 loosely. Molding lower mold
The buffer spring C of the present invention is attached to the shaft body _A3 between the shaft body _A3 and B1.

Fig. 8 shows an embodiment in which a progressive type mold B is provided between the mold holder B ₃ and the mold holder B ₃ on the molding upper mold B ₂ side. It buffers and holds the molding upper mold _B2 .

Specifically, the mounting shaft A is attached to the hole _B4 that is penetrating in the buffer direction of the upper mold _B2 in the mold holder _B3 .
_{The mold holder B 3 and} the protruding shaft end A ₂ of the mounting shaft A are attached by leaving the enlarged shaft head A ₁ with a larger diameter than the same hole B 4 loosely. Upper mold
A buffer spring C of the present invention is attached to the shaft body _A3 between the shaft body _A3 and B2.

When the mold surfaces B ₁₁ and B ₂₁ of the fixed mold B ₁₀ or B ₂₀ in the mold B are worn out during such pressing, or when replacing with another mold, as shown in FIG. Remove the mounting shaft A, and in the former case only, cut the annular tip edge 2a of the collar 2 to the wear height of the fixed type B ₁₀ or B ₂₀ , and then insert the mounting shaft A loosely into the cylindrical holder 1 again. The prescribed preparations shall be made. Particularly in the former case, there is an advantage that the height of the pressing surface can be adjusted without reducing the disc spring 3 and changing its spring pressure.

In the above embodiment, the mold B ₁ or
When the _B2 portion is formed in a concave shape, the annular tip edge 2a of the collar 2 and the end of the cylindrical holder 1 may be set to have the same height.

In addition, the target mold B is not limited to press molds,
Including those for injection.

(Effects of the invention) Therefore, the invention has the following advantages.

The disc spring is integrated with the cylindrical holder, so it does not come apart and can be removed and attached at once when replacing the mold, which satisfies the desired cushioning function and speeds up the replacement work, increasing productivity. can.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional device. FIG. 2 is a longitudinal sectional view showing one embodiment of the buffer spring of the present invention. Third
The figure is a left side view. Figure 4 is a right side view. 5 and 6 are perspective views, and FIG. 5 is partially cut away.
FIG. 7 and FIG. 8 are sectional views showing each state of use;
FIG. 9 is an exploded sectional view of FIG. 7. In the figure, A is the mounting shaft, A ₁ is the enlarged shaft head, A ₂ is the shaft end, A ₃ is the shaft body, B is the mold, B ₃ is the mold holder, B ₄ is the hole, and C is the buffer. 1 is a cylindrical holder, 1a and 1c are stoppers, and 3 is a disc spring.

Claims (1)

[Scope of utility model registration request] Attach the mounting shaft to the through-hole in the mold holder in the buffering direction of the mold, leaving an enlarged shaft head with a larger diameter than the same hole diameter, and insert the shaft into the mold holder and the mounting shaft. In a pressure molding buffer spring that is attached to the mounting shaft part between the shaft end and the mold to which the shaft end is attached, the outer diameter is smaller than the hole mentioned above, and the enlarged shaft head and the shaft end on the mounting shaft are A cylindrical holder is loosely fitted to the shaft body between the cylindrical holders, and a cylindrical holder is loosely fitted to the outer periphery of the cylindrical holder in an overlapping manner in the axial direction, and is prevented from coming out with stoppers at both ends of the holder. A shock-absorbing spring for a pressure-forming mold, comprising a disc spring positioned between a holder and opposing surfaces of the mold so as to be able to buffer the mold.