JPH0133250Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in a molding die for making a mold (sand mold) for casting a cast product in which a rough adjustment portion is formed.

(Prior art) It is well known that an ejector pin is provided to release a mold (sand mold) produced within the cavity of a mold from the mold (for example, (Refer to Publication No. 7657). In order to adjust the balance of cast products such as automobile crankshafts, and to adjust the weight and wall thickness of intake and exhaust manifolds, the adjustment parts of the cast products are adjusted by cutting, etc. after each casting. There is a need to.

In order to reduce the labor involved in such cutting processes, molds (sand molds) have traditionally been used, as shown in Figure 1.
At the step of casting the cast product 2 in step 1, a rough adjustment recess 2a is formed in the cast product 2 in advance so that the amount of cutting work can be minimized.

In order to form the rough adjustment concave portion 2a in the cast product 2, it is necessary to form the rough adjustment convex portion 1a in the mold 1.

By the way, the depth of the coarse adjustment recess 2a of the cast product 2 may vary in balance adjustment amount due to differences in casting conditions, even if the cast product 2 is of the same type.
At the stage of making the mold 1, it is necessary to make the height of the rough adjustment convex portion 1a of the mold 1 adjustable.
(See FIG. 2) is preferable from the viewpoint of production efficiency of the mold 1.

For this reason, conventionally, as shown in FIG.
Eject pins 5, ..., 5 are provided which are moved in and out by the cylinder 4 through The depth was adjusted by appropriately stacking thin iron plates 7, .

However, since the depth of the rough adjustment recess 3a of the mold 3 must be adjusted by inserting and removing the thin iron plates 7, . . . , 7, there is a problem that the adjustment work is troublesome.

(Purpose of the invention) The present invention is capable of adjusting the depth of the rough adjustment concave portion formed in the mold for modeling, that is, adjusting the height of the rough adjustment convex portion of the mold, without replacing the iron plate etc. as in the conventional method. The purpose of this is to enable easy and quick operation with a single touch.

(Structure of the invention) For this reason, the present invention forms a female thread in the through hole that communicates with the modeling cavity of the modeling mold, screws the outer peripheral male thread of the adjustment member into this female thread, and screws the adjustment member into the center of the adjustment member. Fit the eject pin into the shaft hole so that it can slide freely in the axial direction and rotate integrally with the adjustment member around the axis, and then screw the rear end male threaded part of the eject pin into the female threaded part of the eject plate. It was constructed as follows.

Then, the depth of the rough adjustment recess of the mold is adjusted by rotating the adjustment member to move the through hole of the mold forward and backward. Further, by rotating the adjustment member, the eject pin is twisted and rotated, and by setting the pitch of each screw portion, the eject pin is also moved forward and backward in synchronization with the forward and backward movement of the adjustment member. Furthermore, only the eject pin is moved into and out of the modeling cavity by operating the eject plate by the driving means.

(Effects of the invention) According to the invention, the height of the rough adjustment convex portion of the mold can be adjusted simply by rotating the adjustment member screwed into the through hole of the modeling mold, making adjustment work easy with one touch. And it can be done quickly.

In addition, the eject pin that fits into the center shaft hole of the adjustment member moves forward and backward in synchronization with the adjustment member, and is always kept at the same level as the adjustment member, so it does not protrude into the rough adjustment recess of the mold, or other eject pins The eject operation does not occur later.

Furthermore, since the eject pin can eject independently of the adjustment member regardless of the forward/backward movement position of the adjustment member, there is no problem in the ejection action.

(Example) As shown in FIG. 3, the modeling mold 10 of the first example includes an upper mold 10a having a molding cavity forming surface 11, and a lower mold 10b supporting the upper mold 10a. and each mold 10a, 10
b has a series of through holes 10 leading to the build cavity.
c, 10d are formed.

A female threaded portion 10e (for example, pitch P=1.5 mm) is formed in the through hole 10d of the lower mold 10b, and the through hole 10c of the upper mold 10a is set to have a slightly smaller diameter than the inner diameter of the female threaded portion 10e. ing.

On the other hand, the bolt-shaped adjustment member 12 is provided with a hexagonal head 12a (see FIG. 4a) at the rear end.
The above-mentioned through hole 10d is provided on the outer periphery of the intermediate shaft portion 12b.
A male threaded portion 12c is formed to be screwed into the female threaded portion 10e.

Further, at the front end of the adjustment member 12, there is an adjustment seat portion 12 that fits into the through hole 10c of the upper mold 10a.
d is formed.

A through shaft hole 12e is formed in the center of the adjustment member 12.

Next, the eject pin 13 for pushing up the mold (sand mold) 20 is fitted into the through shaft hole 12e of the adjusting member 12 so as to be slidable in the axial direction.

As shown in FIG. 4a, the eject pin 1
Oval-shaped flat parts 13a, 13a are formed on both sides of the axially intermediate part of No. A fork-shaped anti-rotation disc 14 sandwiching the flat parts 13a, 13a from both sides is fitted and fixed with screws 15,
The eject pin 13 is configured to freely slide in the axial direction and rotate integrally with the adjustment member 12 around the axis.

Further, at the rear end of the eject pin 13, a male threaded portion 13b is formed with the same pitch (for example, P=1.5 mm) as the female and male threaded portions 10e and 12c.

The eject plate 16 for moving the eject pin 13 in and out has a locking groove 16a.
(See Figure 4b) Upper plate 16
b, and a lower plate 16c that fastens and supports the upper plate 16b with bolts 17 and is connected to a cylinder 18.
The oval-shaped head 19a of the boss member 19 is fitted and supported in the anti-rotation groove 16a of the boss member 19 so as not to rotate freely.

The shaft portion 19b of the boss member 19 is formed with a female threaded portion 19c that is screwed into the male threaded portion 13b of the eject pin 13.

If the molding die 10 is configured as described above, first the front end 12h of the adjustment seat 12d of the adjustment member 12 is
is set flush with the forming surface 11 of the upper mold 10a, and the front end surface 13c of the eject pin 13 is set flush with the front end surface 12h of the adjusting member 12.

As shown in FIG. 5a, when forming the rough adjustment convex portion 20a on the mold 20, when the hexagonal head 12a of the adjustment member 12 is rotated in the direction in which the male threaded portion 12c retreats, the adjustment seat The front end surface 12h of the portion 12d gradually sinks into the through hole 10c of the upper mold 10a, and a rough adjustment recess 10f for the rough adjustment convex portion 20a of the mold 20 is formed above the through hole 10c. The depth of this coarse adjustment recess 10f is
It can be set arbitrarily by adjusting the amount of movement of the adjusting member 12.

By this rotational operation of the adjustment member 12, the eject pin 13 is also rotated around the axis via the detent disk 14, and the male threaded portion 13b is rotated around the boss member 19.
It is screwed into the female threaded portion 19c in the retracting direction. In this case, since the male threaded portion 12c of the adjustment member 12 and the male threaded portion 13b of the eject pin 13 have the same pitch (P=1.5 mm), the backward stroke of the adjustment member 12 and the backward stroke of the eject pin 13 are equal, and the backward stroke of the adjustment member 12 and the eject pin 13 are equal. Eject pin 1
3 moves back in synchronization, so eject pin 13
The front end surface 13c of the adjustment member 12 and the front end surface 12h of the adjustment member 12 are maintained flush with each other.

Further, after the mold 20 is made by the modeling mold 10, the eject plate 1 is made by the cylinder 18.
6 is moved upward, the eject pin 13 is only prevented from rotating by the anti-rotation disk 14 and can freely slide through the through shaft hole 12e of the adjustment member 12, so that the mold 20 cannot be pushed up by the eject pin 13. can.

On the other hand, as shown in FIG. 5b, in order to form the rough adjustment recess 20b in the mold 20, when the hexagonal head 12a of the adjustment member 12 is rotated in the direction in which the male threaded part 12c advances, the adjustment seat 12d front end surface 12 of
h protrudes above the through-hole 10c of the upper mold 10a, and above the through-hole 10c, a rough adjustment convex portion 12g for the rough adjustment recess 20b of the mold 20 is attached to the adjustment seat 12d.
It comes to be formed by

Also at this time, the forward stroke of the adjustment member 12 and the forward stroke of the eject pin 13 are equal;
Since the adjustment member 12 and the eject pin 13 move forward in synchronization, the front end surface 13c of the eject pin 13
The state in which the front end surface 12h of the adjusting member 12 is flush with the front end surface 12h of the adjusting member 12 is maintained. The mold 20 can be pushed up by the eject pin 13 in the same manner as described above.

In the modeling mold 10 of the first embodiment, the adjustment seat 12d is also rotated by the rotation operation of the adjustment member 12. If the upper mold 10'a has an inward protrusion 10'g, as in the case of the mold 10', the adjustment seat 12d cannot be rotated. Therefore, in the second embodiment, an adjustment seat 22 that does not rotate but slides up and down is separately provided.

That is, the through hole 10'd of the lower mold 10'b has a female threaded part 10'e (for example, the female threaded part 10 of the first embodiment).
The through hole 10'c of the upper mold 10'a is formed with a pitch P = 3.0 mm, which is twice that of e.
The outer diameter is set to be slightly larger than the outer diameter of 0'e.

On the other hand, the shaft portion 12'b of the bolt-shaped adjustment member 12'
On the outer periphery of the through hole 10'd is a female threaded portion 1.
A male threaded portion 12'c is formed to be screwed into the adjusting member 12'.
b, 19c with the same pitch (for example, P = 1.5 mm) and an opposite female screw portion 12'i, and the through shaft hole 1
The lower part of 2'e is set to have a slightly larger diameter than the eject pin 13.

Further, a separate adjustment seat 22 is provided which fits into the through hole 10'c of the upper mold 10'a, and the adjustment member 1
The male threaded portion 22b screws into the female threaded portion 12'i of 2'.
A through shaft hole 22c is formed in the center of the adjustment seat portion 22, into which the eject pin 13 is fitted so as to be slidable in the axial direction.

As shown in FIG. 7, the adjustment seat portion 22 includes:
A recess 2 that engages with the inward protrusion 10'g of the mold 10'
Form 2d.

The rest of the structure is the same as that of the first embodiment.

If the modeling mold 10' is configured as described above,
First, the front end surface 12'j of the adjustment member 12' is flush with the inner surface of the lower mold 10'b, and the front end surface 2' of the adjustment seat 22 is flush with the inner surface of the lower mold 10'b.
2e is flush with the forming surface 11 of the upper mold 10'a, and the front end surface 13c of the eject pin 13 is the adjustment seat 22.
It is set so that it is flush with the front end surface 22e of.

As shown in FIG. 8a, when forming the rough adjustment convex portion 20a on the mold 20, the adjustment member 12'
When the hexagonal head 12'a is rotated in the direction in which the male threaded part 12'c retreats, the male threaded part 12'c
Since the pitch of the female threaded portion 10'e is (P=3.0 mm), the adjusting member 12' moves back with twice the backward stroke of the first embodiment, but the male threaded portion 22b of the adjusting seat 22 Female threaded portion 1 of adjustment member 12'
Since the pitch of 2'i is (P=1.5 mm) and is in the opposite direction, the adjusting seat 22 can move the inward protrusion 10' of the mold 10' with a backward stroke of 1/2 of the backward stroke of the adjusting member 12'. The front end surface 22e is inserted into the through hole 10'c of the upper mold 10'a, and the mold 20 is roughly adjusted in the upper part of the through hole 10'c. A rough adjustment recess 10'f for the protrusion 20a is now formed. As in the first embodiment, the depth of the rough adjustment recess 10'f can be arbitrarily set by adjusting the amount of movement of the adjustment member 12'.

By this rotational operation of the adjusting member 12', the eject pin 13 is also rotated around the axis via the detent disc 14, and the male threaded portion 13b is rotated around the boss member 1.
9 into the female threaded portion 19c in the backward direction. In this case, the male threaded portion 22b of the adjustment seat 22 and the male threaded portion 13b of the eject pin 13 have the same pitch (P = 1.5 mm) and are in opposite directions, so the backward stroke of the adjustment seat 22 and the backward stroke of the eject pin 13 are equal. Since the adjustment seat 22 and the eject pin 13 move backward in synchronization, the front end surface 13c of the eject pin 13 and the front end surface 22e of the adjustment seat 22 are maintained flush with each other.

On the other hand, in order to form the rough adjustment recess 20b in the mold 20 as shown in FIG. In the same way as described above, the front end surface 22e of the adjustment seat 22 protrudes above the through hole 10'c of the upper die 10'a with a stroke of 1/2 of the forward stroke of the adjustment member 12', and the through hole 10 'c
A coarse adjustment convex portion 22g for the rough adjustment concave portion 20b of the mold 20 is formed above by the adjustment seat portion 22.

At this time, the adjustment seat 22 and the eject pin 1
3 have the same forward stroke, and the adjustment seat 22 and the eject pin 13 move forward in synchronization, so that the front end surface 13c of the eject pin 13 and the front end surface 22e of the adjustment seat 22 are maintained flush with each other.

In addition, in the above embodiment, the rough adjustment convex portion 20 is provided on the mold.
Although the case of forming the coarse adjustment recesses 20b and 20a has been described, it can be applied to the case of forming these on the core.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the relationship between the cast product and the mold;
FIG. 2 is a cross-sectional view of a conventional molding mold, FIG. 3 is a cross-sectional view of a molding mold according to the first embodiment of the present invention, and FIG. 4a is a cross-sectional view of FIG. Figure b is the third
Figures 5a and 5b are cross-sectional views of the first
FIG. 6 is an operational sectional view of the modeling mold of the embodiment; FIG. 6 is a sectional view of the modeling mold of the second embodiment of the present invention;
The figure is a cross-sectional view taken from the side shown in FIG. 6, and FIGS. 8a and 8b are operational cross-sectional views of the molding die of the second embodiment. 10, 10'... Modeling mold, 10c, 10d,
10'c, 10'd...Through hole, 10e, 10'e
...Female threaded portion, 12, 12'...Adjustment member, 12
c, 12'c...Male thread part, 12d, 22...Adjustment seat part, 12e, 12'e...Through shaft hole, 12'i
... Female thread part, 13 ... Eject pin, 13a
...Flat part, 13b...Male thread part, 16...Eject plate, 18...Cylinder, 19...Boss member, 20...Mold, 22b...Male thread part.

Claims (1)

[Scope of utility model registration request] A modeling mold is provided with a through hole communicating with the modeling cavity, a female threaded portion formed in the through hole, a male threaded portion screwed into the female threaded portion of the through hole formed on the outer periphery, and a male threaded portion screwed into the female threaded portion of the through hole. an adjustment member having a through-axis hole formed therein; and an adjustment member fitted into the through-axis hole of the adjustment member so as to be slidable in the axial direction and rotate together with the adjustment member around the axis; An eject pin having a male threaded portion formed thereon, and an eject plate having a female threaded portion screwed into the male threaded portion of the eject pin, and for moving the eject pin into and out of the modeling cavity by a driving means, A mold for modeling, characterized in that the pitch of each of the threaded parts is set so that the eject pin moves forward and backward in synchronization with the forward and backward movements.