JPS6354468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the invention (1) Industrial field of application The present invention provides a mold used for casting etc., in particular a first mold having a guide pin, and a mold that is fitted to the first mold,
The present invention relates to a locking device for locking between a first mold and a second mold in a mold comprising a second mold having a pin hole that fits into a guide pin.

(2) Prior Art Conventionally, in this type of locking device, a truncated conical recess of a clamp arm is fitted into a truncated conical protrusion formed on the outer surface of the mating portion of the first and second molds. It is known what made it so.

(3) Problems to be Solved by the Invention However, since one of the components of the device is a protrusion formed on the outer surface of the mating portion of both molds, it is necessary to provide a sliding groove for one slide core in both molds. There is a problem in that it cannot be applied to molds with such complicated structures, and the scope of application is limited.

In view of the above, the present invention provides a locking device having a simple structure, which is constructed using a portion of a mold that is not directly involved in shaping the shape of an article, that is, a guide pin and its surroundings, and can be easily applied to various molds. The purpose is to provide

B. Structure of the Invention (1) Means for Solving the Problems The present invention comprises a first mold having a guide pin, and a second mold fitted to the first mold and having a pin hole that fits with the guide pin. A locking device for a mold, wherein a pair of wedges are formed so as to straddle the circumferential wall of the pin hole and the guide pin and sandwich the guide pin when the first mold and the second mold are combined. hole and
The present invention is characterized by comprising a wedge body having a bifurcated portion that penetrates the circumferential wall of the pin hole and fits into both wedge holes.

(2) Action When the wedge body is fitted into the pair of wedge holes formed when the first and second dies are fitted together, the two dies are integrated via the wedge body and the guide pin, and this creates a gap between the two dies. can be reliably locked. Further, even if the wedge hole and the wedge body are worn out, the above-mentioned locked state can be reproduced due to their wedge action. Furthermore, since the two forks of the wedge fit into the pair of wedge holes sandwiching the guide pin, even if the filling pressure of the molding material acts between the first and second molds, there will be no bias between the two wedge holes and the two forks. Excessive weight is not applied, thereby preventing damage around the wedge hole, bending of the bifurcated portion, etc., thereby improving the durability of the lock device.

(3) Example The casting mold 1 includes a fixed lower mold 1 as the first mold.
₁ and a movable upper mold _{1 2 as} a second mold that is fitted to the lower mold 1 ₁ .
A positioning guide pin 2 is provided protrudingly in the upper mold 1 ₁ , and a pin hole in which the guide pin 2 fits when the molds 1 ₁ and 1 ₂ are put together is provided in the upper mold 1 1 at a position facing each guide pin 2 . 3 is formed.

Each guide pin 2 and its vicinity are provided with a locking device L, and since these devices L have the same construction, the device L on the upper right in FIG. 1 will be described.

An annular groove 4 is formed at the upper end of the guide pin 2,
The upper inner surface 4a of the annular groove 4 is formed into an upward slope from the inside to the outside of the lower mold ₁₁ , that is, from the left end to the right end in FIG. 2A, and the lower inner surface 4b is formed at the left end in FIG. It is formed into a slope that slopes downward toward the right end.

In the peripheral wall of the pin hole 3 of the upper mold 1 ₂ , there is an insertion hole 5 having a rectangular cross section with its right end opening on the outer surface of the upper mold 1 ₂ and its left end opening on the inner peripheral surface of the pin hole 3 in FIG. 2A.
(FIG. 3), and a pair of U-shaped grooves 6 that communicate with the opening of the insertion hole 5 on the pin hole 3 side and open opposite to each other on the inner peripheral surface of the pin hole 3 are formed. The upper inner surfaces 5a and 6a of the insertion hole 5 and the U-shaped groove 6 are formed on slopes having the same slope as the upper inner surface 4a of the annular groove 4, and when both molds 1 ₁ and 1 ₂ are put together, the upper inner surfaces 4 a and 5
a and 6a are arranged on the same inclined plane. In addition, the lower inner surface 5 of the insertion hole 5 and the U-shaped groove 6
b and 6b are formed on inclined surfaces having the same slope as the lower inner surface 4b of the annular groove 4, so that when both molds 1 ₁ and 1 ₂ are put together, the lower inner surfaces 4b, 5b, and 6b are located on the same inclined surface. It's summery.

As a result, when both molds 1 ₁ and 1 ₂ are put together, as shown in FIGS. 2B and 3, the U-shaped grooves 6 and the opposing portions of the annular groove 4 cooperate with each other to connect the circumferential wall of the pin hole 3. A pair of wedge holes 14 are formed so as to straddle the guide pin 2 and sandwich the guide pin 2, and these wedge holes 14 communicate with the insertion hole 5. The wedge hole 14 and the insertion hole 5 thus form a series of locking holes 7.

A hydraulic cylinder 9 whose axis line of the piston rod ₈ is aligned with the axis line of the insertion hole 5 is attached to the outer surface of the upper mold 12 via four support rods 10, and a wedge body 11 is attached to the tip of the piston rod 8. is fixed. The wedge body 11 has a base end 11a having an inclined surface that can come into close contact with the periphery of the pin hole 3 on the upper and lower inner surfaces 5a and 5b of the insertion hole 5, and a base end 11a that branches from the base end 11a and connects both wedge holes 14. Upper and lower inner surfaces 4a, 4b,
Bifurcated portion 11 having an inclined surface that can come in close contact with 6a and 6b
b.

A guide rod 12 is attached to the piston rod 8, and the guide rod 12 is connected to the hydraulic cylinder 9.
It is slidably supported on a bracket 9a.

In the above configuration, when the upper mold ₁₂ is raised to open the mold as shown in FIG. 2A, the piston rod 8, and therefore the wedge body 11, retreat due to the operation of the hydraulic cylinder 9, and the forked portion 11b thereof is moved back. It is located within the insertion hole 5 of the upper mold ₁₂ .

As shown in Fig. 2B, when the upper mold 1 ₂ is lowered and aligned with the lower mold 1 ₁ in the mold closing state, a series of wedge holes are formed in the peripheral wall of the pin hole 3 and the guide pin 2 as described above. 14 is formed, so the hydraulic cylinder 9
When actuated, the piston rod 8 and therefore the wedge body 11 move forward, and the bifurcated portion 11b moves into both wedge holes 14.
Furthermore, the base end portions 11b fit into the peripheral portions of the pin holes 3 of the insertion holes 5, respectively.

The upper mold 1 ₂ is reliably locked to the lower mold 1 ₁ due to the close contact between the inclined surfaces of the wedge hole 14, the insertion hole 5, and the wedge body 11, and the movement of the upper mold 1 ₂ in the axial direction of the guide pin 2 is ensured. is fixed.

After this locking, the hopper 1 is inserted into the pouring port _1a of the upper mold 12.
Casting is performed by supplying molten metal through 3. During this casting, even if the filling pressure of the molten metal acts between the molds 1 ₁ and 1 ₂ , the wedge 11 has a bifurcated portion 11 b fitted into a pair of wedge holes 14 that sandwich the guide pin 2 . Hole 1
4 and the bifurcated portion 11b, thereby avoiding damage around the wedge hole 14, bending of the bifurcated portion 11b, etc., and locking device L.
can improve the durability of

When opening the mold, the wedge body 11 is moved back as shown in FIG. 2A to release the fitting, and then the upper mold ₁₂ is raised.

C. Effects of the Invention According to the present invention, when the first and second molds are put together, the wedge body is inserted into the pair of wedge holes that are formed so as to straddle the peripheral wall of the pin hole and the guide pin and sandwich the guide pin. Since they fit together, the two molds can be integrated through the wedge and the guide pin, thereby reliably locking the two molds together.

Furthermore, since the lock hole is formed in the guide pin and its vicinity, which are not directly involved in shaping the shape of the article in the mold, the lock device according to the present invention can be easily applied to molds having various structures having guide pins, and its application It has the advantage of a wide range. Moreover, the structure is simple and low cost.

Furthermore, even if the wedge hole and the wedge body are worn out, the aforementioned locked state can be reproduced due to their wedge action.

Furthermore, due to the fit between the two forks of the wedge and both wedge holes, even if the filling pressure of the molding material acts between the two molds, no unbalanced weight will be applied between the wedge holes and the two forks. A locking device with improved durability can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a plan view of the mold in an open state, and FIG. 2A is a plan view of the mold in the open state.
FIG. 2B is a sectional view similar to FIG. 2A in a closed state of the mold, and FIG. 3 is a sectional view taken along the line of FIG. 2B. L...Lock device, 1...Mold, ₁₁ ...Lower mold (first mold), 12...Upper mold (second mold), ₂ ...Guide pin, 3...Pin hole, 11... ...cuneiform, 11a...
Forked part, 14... wedge hole.

Claims (1)

[Claims] 1 a first mold ₁ having a guide pin 2;
A mold ₁ consisting of a second mold 1 2 which is fitted to the mold 1 1 and has a pin hole 3 that fits with the guide pin ₂ ;
A locking device comprising the first type 1 ₁ and the second type 1 _{2 .}
When put together, a pair of wedge holes 14 are formed to span the circumferential wall of the pin hole 3 and the guide pin 2 and sandwich the guide pin 2; A locking device for a mold, comprising a wedge body 11 having a bifurcated portion 11b that fits into a hole 14.