JPH0312992B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for removing a core in a die-casting mold that opens and closes in conjunction with a hydraulic cylinder, and a direction for removing the core.

[Conventional technology]

Conventionally, in die casting molds, when a product has an undercut part or a punching hole that cannot be constructed using only a fixed die and a movable die, it is necessary to provide a core so that it can slide in the direction of casting through the undercut part or punching hole. The product is cast using the following methods.

For example, as shown in FIG. 4, when a product a is provided with an undercut part b, a recess part c, and a cast hole d,
Conventionally, regarding the undercut part b and the recessed part c,
The core die c is moved by the arrow g←→ by the hydraulic cylinder f.
It can be formed by sliding in the g′ direction, but
It is impossible to punch out a hole d in a direction perpendicular to the sliding direction g←→g' of the core die e using the core die e.

That is, it is necessary to provide a protrusion e' on the core die e to form the casting hole d, but when the core die e slides in the direction of arrow g←→g', the protrusion e' is provided. Therefore, the cast hole d cannot be cast out.

Figure 5 shows the sliding direction g←→ of the core die e.
A conventional example is shown in which double cores e and h are provided using cylinder f at an angle different from g', and a casting hole i is cast out.

However, even in such a core casting method, the casting angle of the casting hole i is limited with respect to the sliding direction g←→g' of the core die e, and the sliding direction g←→
It is impossible to cast out the above-mentioned casting hole d which is at a right angle to g' or an acute angle close to a right angle.

Therefore, conventionally, regarding the cast hole d,
The d part of the hole is formed into a thick wall and then machined separately, but this not only makes the work cumbersome, but because it is formed into a thick wall, the problem is that cavities are likely to occur in the product. There is.

[Problem that the invention seeks to solve]

As a result of studies in view of the above-mentioned conventional problems, the present invention enables a floating core to slide integrally with the core die, and independently moves the floating core in a direction different from the sliding direction of the core die. A core casting device capable of simultaneously drilling an undercut portion and a casting hole in a sliding direction of a core die and a casting hole in a direction perpendicular to the sliding direction by combining the core die in a slidable manner. , its purpose is to provide a casting method.

[Means for solving problems]

The present invention provides a core casting device for a die casting mold for molding products having casting holes, which includes a fixed die, a movable die that can be opened and closed in the direction of opening the clamping mold, and a movable die that can be slid in the sliding direction of the core die. It has a die casting mold consisting of a core die, and is slidable in a direction transverse to the sliding direction of the core die by a hole formed in the core die and an extrusion rod connected to a drive mechanism within the hole. A method for casting out a core in a die-casting mold, which is configured to include a floating core that can be moved integrally with the core die in the sliding direction of the core die, and to form a product having a casting hole. In the step, the core die for casting out the undercut part is moved in the forward direction of the core die, the movable die is moved in the mold clamping direction to clamp the mold, and the drive mechanism is activated to move the extrusion rod. It consists of a step of extruding and fixing the floating core in the hole formed in the core die, and a casting step of removing the product after casting the molten metal, and the floating core 10 crosses the sliding direction of the core die. The above problem was solved by drilling holes in the direction of the steel.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

First, the apparatus of the present invention will be explained.

As shown in FIGS. 1 to 3, the fixed die 1 is embedded in a fixed holder 2 and fixed with a socket screw (not shown), and the movable die 3 is embedded in a movable holder 4 and fixed with a socket screw (not shown). It is fixed with screws.

A concave groove 5 is provided in the movable holder 4 so as to communicate with the movable die 1 in a direction perpendicular to the mold opening direction A←→A', and the core holder 6 is inserted into the concave groove 5 as shown in the figure. They are fitted and supported so that they can move forward and backward in the direction of the arrows ← → ′.

The movable holder 4 is slidably supported by a plurality of guide pins 7, etc., so that the mold can be clamped and opened freely in the direction of arrows A←→A' with respect to the fixed holder 2, and is supported by a hydraulic cylinder or the like (not shown). mold clamping,
The mold is opened.

A core die 8 is fixed to the front end of the core holder 6 by a socket screw (not shown).

A hole 9 is penetrated through the core die 8 in a direction perpendicular to the sliding direction of the core die ← → RO′.
A floating core 10 is fitted into the hole 9 so as to be slidable in the mold-clamping and mold-opening direction A←→A'.

The movable die 3 and the movable holder 4 have holes 11 and 12 penetrating them, respectively, on the extension line in the sliding direction of the floating core 10, and the extrusion rod 13 of the floating core 10 can freely slide into the holes 11 and 12. It is fitted.

A cylinder fixing plate 14 is fixed to the movable holder 4 with a socket screw (not shown), and a drive mechanism 23 for the floating core 10 is provided on the cylinder fixing plate 14. That is, the drive mechanism 23 is formed as follows.

The cylinder 15 is fixed to the cylinder fixing plate 14 with a socket screw (not shown),
The extrusion rod 13 is screwed and connected to the output shaft 15a of the cylinder 15, and is formed to be integrally clamped with the cylinder 15 and slid back and forth in the mold opening direction A←→A'.

Further, the floating core 10 is integrally formed with a main body part 10a and a product forming part 10b, and the outer diameter of the main body part 10a maintains a small gap for sliding with respect to the hole 9. The product molding part 10b has sufficient dimensions for the product 16.
It is formed so that a cast hole 17 can be formed perpendicular to the mold clamping and mold opening direction A←→A'.
and the protrusion 3a of the movable die 3 in the axial direction, and there is a slight gap between the tip of the extrusion rod 13 and the tip of the extrusion rod 13 when the mold is clamped (Fig. 1). The floating core 10 is formed so as to be formed.

Further, a molding part 8a for forming an undercut part 18 in the product 16 is formed at the front end of the core die 8, and in addition, a molding part 8a for forming the cast hole i shown in the above-mentioned conventional example is formed. It is also possible.

Further, although the intersecting angle between the core die 8 and the floating core 10 is a right angle in the illustrated embodiment, the floating core 10 may be arranged at an arbitrary inclination angle with respect to the core die 8. Yes, and the floating core 10
is not limited to a single number as shown in the illustrated example, but it is also possible to provide two or more than two locations as necessary.

In the figure, reference numeral 19 denotes an extrusion pin, which is fixed to the pin plate 21 so that it can be extruded into the cavity 20 by penetrating the movable die 3, the movable holder 4, and the cylinder fixing plate 14, respectively. The product 16 is slid in the mold clamping and mold opening direction, and the product 16 is pushed out from the cavity 20. 22 indicates a spacer.

Next, the method of the present invention and the operation of the above-mentioned apparatus applied to the method will be explained.

In the clamped state shown in FIG. 1, the floating core 10 is securely held at the illustrated position by the inner surface 1a of the fixed die 1 and the protrusion 3a of the movable die 3.

In this state, die casting alloy ADC10 was cast under the following example casting conditions.

Example of casting conditions Mold temperature: 200℃ Hot water temperature: 680℃ Casting pressure: 800Kg/cm ² Casting speed 40
m/sec Chill time: 20 seconds After the molten metal has solidified and a suitable time has elapsed, the cylinder 15 is operated at the same time as the mold is opened, and the extrusion rod 13 is advanced, and the floating core 10 moves toward the fixed die 1 side as shown in Fig. 2. It is extruded and separated from the product 16.

Subsequently, the cylinder 15 is operated, and the extrusion rod 13
to retreat. Next, when the core holder 6 and the core die 8 are retreated in the direction of the arrow R' shown in the figure by a hydraulic cylinder or the like (not shown), the floating core 10 is retreated together with the core die 8, and the state shown in FIG. 3 is obtained. becomes.

Next, the product 16 is pushed out by the push-out pins 19, and the product 16 is cast.

Next, the core holder 6 and the core die 8 are moved forward by a hydraulic cylinder (not shown), and then the molds are clamped.
is pushed back and returns to the state shown in FIG.

By repeating the above cycle, it is possible to mass-produce products having the cast holes 17 and undercut portions 18 as shown.

〔Effect of the invention〕

As explained above, according to the core casting apparatus and the core casting method according to the present invention, the core die 8
Undercut part 18 in sliding direction B←→B'
etc., the casting hole 17, which is inclined at right angles to the slide direction ←→RO' or at an arbitrary angle, is movable integrally with respect to the core die 8 and the core die 8, and Simultaneous casting can be carried out by means of the floating core 10, which is installed so as to be slidable in the direction RO←→RO' and the direction perpendicular to the direction RO'.

Therefore, according to the method of the present invention, the cast hole 1
7 and an undercut portion 18, and which are free from defects such as cavities, can be efficiently mass-produced, and according to the apparatus of the present invention, the above-mentioned product 16 can be cast at low cost with a simple configuration. There is.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional side view showing an embodiment of the core casting apparatus according to the present invention when the mold is closed, Fig. 2 is a longitudinal cross-sectional side view of the same embodiment when the mold is opened, and Fig. 3 is the same embodiment. FIGS. 4 and 5 are longitudinal sectional side views showing a conventional core casting apparatus, respectively, with the core holder and core die retracted after opening the mold. 1... Fixed die, 3... Movable die, 8... Core die, 9... Hole, 10... Floating core, 23... Drive mechanism, A←→A'... Mold clamping mold opening direction, B←→B'...Medium Child die slide direction.

Claims (1)

[Claims] 1. A core casting device for a die-casting mold for forming a product 16 having a casting hole 17, which includes a fixed die 1, a movable die 3 that can be opened and closed in mold opening directions A and A', and , has a diakite mold consisting of a core die 8 that can freely slide in sliding directions of the core die 8, a concave hole 9 formed in the core die 8, and a drive mechanism 2 in the hole 9.
The extrusion rod 13 connected to 3 is capable of sliding in a direction transverse to the slide directions L and B' of the core die, and moves integrally with the core die 8 in the slide directions L and B' of the core die. A core casting device characterized in that it is equipped with a freely floating core 10. 2. In a core casting method in a die casting mold for forming a product 16 having a casting hole 17, a step of moving the core die 8 in the forward direction B of the core die for casting out the undercut portion 18 and a movable step A step of moving the die 3 in the mold-clamping direction A to clamp the mold, a step of operating the drive mechanism 23, extruding the extrusion rod 13 and fixing the floating core 10 in the hole 9 formed in the core die 8, and a step of discharging the molten metal. It consists of a casting process of removing the product 16 from the die-casting mold after casting, and is characterized in that the floating core 10 is used to punch out a casting hole 17 in a direction that crosses the sliding direction of the core die. A core casting method.