JPH0744371Y2 - Positioning mechanism of extrusion pin in casting mold - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Application Field of the Invention The present invention forms a cavity for casting a product on a contact surface of a mold that can be divided into two parts, and forms the cavity in each mold. The present invention relates to a mechanism for positioning an extruding pin in a casting mold provided with an extruding pin for separating a product.

(2) Conventional Technology Conventionally, in such a casting mold, an extrusion pin provided in each mold that can be divided into two is fixed to a pair of extrusion pin plates driven by a cylinder provided in the mold. When the mold is clamped, the return pins fixed to the two push pin plates are brought into contact with each other so that the tips of the push pins are positioned so as to form a part of the cavity surface of the mold. Thus, when taking out the product from the cavity of the casting mold after the completion of casting,
The movable mold is separated from the fixed mold and the mold is opened. At the same time, the cylinder provided in the movable mold is extended to hold the push pin at the position where it abuts the product, and leave the product on the fixed mold side. Has been done.

(3) Problems to be Solved by the Invention However, in the above-mentioned conventional casting mold, the mold and the return pin are heated and non-uniformly thermally expanded due to the pouring of the metal into the cavity, and as a result, the contact between the two return pins is caused. The faces tend to be spaced apart from each other. For this reason, when the movable mold side cylinder is extended during the mold opening, the push pin projects toward the product side by the gap between the return pins, and the surface of the product that is not completely solidified immediately after casting. There was an inconvenience such as scratching the product and cracking thin products.

The present invention has been made in view of the above circumstances, and provides a push-out pin positioning mechanism in a casting mold that can prevent the return pins from being separated from each other due to thermal expansion due to pouring and can eliminate the above-mentioned inconvenience. The purpose is to do.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above-mentioned object, the present invention has a two-divided mold including a fixed mold and a movable mold, and a divided surface of both molds. Is formed into a cavity to form a cavity, an extrusion pin supported by each of the two molds so as to be movable relative to each other, integrally connected to each of the fixed mold side extrusion pin and the movable mold side extrusion pin, In a casting mold provided with a return pin that positions the tips of the two push-out pins on the surface of the recess by positioning the step portion or the end portion on the reference surface provided on the both molds during mold clamping, A wedge member is provided between the return pin on the movable mold side and the return pin on the fixed mold side so that it can be inserted, and the return pin on the movable mold side is positioned on the reference surface on the movable mold side by the wedge member when clamping the mold. Characterized by urging as much as possible .

(2) Operation According to the features of the present invention having the above-mentioned configuration, when the fixed mold and the movable mold are clamped, the tip of the push pin is fixed so as to be aligned with the surfaces of the recesses of both molds. The return pin on the mold side and the return pin on the movable mold side are positioned by the reference surfaces provided on both molds. When the movable die is separated from the fixed die after the casting is completed and the die is opened, the push pin of the movable die is advanced in association with the retreat of the movable die, whereby the push pin is brought into contact with the product. While maintaining the state, only the movable mold is separated from the fixed mold so that the product remains in the fixed mold. At this time, since the return pin on the movable mold side is biased by the wedge member, the return pins on the movable mold side are prevented from being separated from each other due to thermal expansion due to the pouring, and as a result, the push pin on the movable mold side is prevented. Are prevented from excessively projecting to the product side.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention.
The figure is a side view of the entire casting mold device, and Fig. 2 is the diagram of Fig. 1.
II-II line arrow view, FIG. 3 is an enlarged view of the III section of FIG.

As shown in FIG. 1 and FIG. 2, this casting mold device includes a fixed mold 4r mounted on a mold supporting member 3r fixed to a base plate 2 erected on a fixed base 1 and a guide rail 5. The movable mold 4l is mounted on the mold supporting member 3l fixed to the supporting frame 7 which is moved by the cylinder 6, and the recesses 4r ₁ and 4l ₁ formed on the joint surface of both molds 4r and 4l when the molds are clamped.
Thus, the cavity 8 into which the molten metal is poured is formed.

In the space formed between both mold supporting members 3r, 3l and both molds 4r, 4l, there is a pair of pushing plates 10r, 10l driven by cylinders 9r, 9l mounted on the mold supporting members 3r, 3l. The push-out pin plates 11r, 11 are fixed in a superposed state, and a plurality of push-out pins 12l, 12r are fixed to the facing surfaces of the pair of push-out pin plates 11r, 11 respectively. On the other hand, the push pin plate 11r on the fixed die 4r side and the push pin plate 11 on the movable die 4l side
Return pins 13 and 14 are fixed to the four corners of each so as to face each other.

As is clear from FIG. 3, the return pin 13 on the fixed die 4r side has a small diameter portion 13 ₁ slidably engaged with a guide hole 4r ₂ formed in the fixed die 4r, and this small diameter portion 13 ₁ made from the pressing portion 13 ₃ which is continuously provided via a step portion 13 _2, likewise the small-diameter portion 14 _first return pin 14 of the movable mold 4l side that engages slidably in the guide hole 4r _2, the small-diameter It is composed of a pressing portion 14 ₃ connected to the portion 14 ₁ via a step portion 14 ₂ . A vertical surface 13 ₄ and an inclined surface 14 ₄ are formed on the inner ends of the return pin 13 on the fixed mold 4r side and the return pin 14 on the movable mold 4l side that face each other, and both sides 13 ₄ and 14 _A tapered space δ is formed by ₄ .

A wedge member 17 driven by a cylinder 16 is provided on each of the two brackets 15 fixed to the upper and lower parts of the fixed mold 4r. When the cylinder 16 is extended and the wedge member 17 is moved forward, The vertical surface 17 ₁ engages with the vertical surface 13 ₄ of the return pin 13 on the fixed mold 4r side, and the inclined surface 17 ₂
There engages the inclined surface 14 ₄ of the return pins 14 of the movable mold 4l side.

As it is apparent from Figure 1, both types 4r, the extend four cylinders 16 while clamping the 4l inserting the wedge member 17 in the space [delta], step 13 ₂ of the return pin 13 fixed metal contact is positioned on the reference surface 4r ₃ types 4r, the tip of the push-out pin 12r of the stationary mold 4r side matches the surface of the recess 4r ₁ to form the cavity 8. At the same time, the stepped portion 14 ₂ of the return pin 14 is positioned in contact with the reference surface 4l ₃ of the movable mold 4l, the tip of the push-out pin 12l of the movable mold 4l side matches the surface of the concave portion 4l _1. At this time, the cylinder 16 is constantly pressurized,
The action of the wedge member 17 causes the return pin 14 on the movable mold 4l side to be urged outward.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

By extending the cylinder 6 and bringing the movable mold 4l closer to the fixed mold 4r, the two molds 4l and 4r are joined together, and the recess 4
The cavity 8 is formed by r ₁ and 4l ₁ . At this time, the cylinders 9r and 9l of the fixed mold 4r and the movable mold 4l are both in the contracted state shown in the figure. From this state, the four cylinders 16 are extended and the wedge member 17 is inserted into the gap between the return pins 13 and 14. by press-fitting to the [delta], step 13 ₂ of the return pin 13 is fixed mold 4
On the reference surface 4 r _{3 of} r, the step portion 14 ₂ of the return pin 14 is
Positioned by abutting against the reference surface 4l _{3 of} l. As a result, the tips of the push-out pins 12r, 12l form a part of the cavity 8 in conformity with the surfaces of the recesses 4r ₁ , 4l ₁ of the molds 4r, 4l.

From this state, a molten iron of about 1500 ° C. is poured into the cavity 8 to complete the casting, and then both dies 4r and 4l are opened to take out the product. This work is performed by first contracting the cylinder 6 to separate the movable mold 4l from the fixed mold 4r and leaving the product on the fixed mold 4r side. Therefore, the cylinder 9l on the side of the movable mold 4l is extended at the same speed in association with the retreat of the movable mold 4r due to the contraction of the cylinder 6, and the tip of the push pin 12l is brought into contact with the surface of the product. Hold on. This allows the product to
It remains on the fixed mold 4r side while being regulated to 12l, and only the movable mold 4l separates from the product.

Now, at the time of the above-mentioned mold opening, both molds 4r, 4l are heated non-uniformly as the temperature rises due to the pouring of the high-temperature molten metal, and the return pin 13 on the fixed mold 4r side and the movable mold 4l side are Return pin
14 tends to be separated from each other to form a gap, but if the cylinder 9l is extended as described above in a state where both return pins 13 and 14 are separated, a push pin corresponding to the gap.
There is a possibility that 12 l may excessively project to the product side and damage the product. However, since the gap is prevented from being generated by the wedge member 17 inserted between the return pins 13 and 14, excessive protrusion of the push pin 12l is prevented.

When the movable mold 4l is separated from the product in this way, the cylinder 9l on the movable mold 4l side contracts and the push pin 12l retracts, and the cylinder 9r on the fixed mold 4r side extends and the push pin 12r moves. The process advances, and the product removal from the fixed mold 4r is completed.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various small design changes can be made without departing from the present invention described in the scope of claims for utility model registration. It is possible to

For example, in the embodiment, the pressing portion 13 ₃ having the step portion 13 ₂ is formed on the return pin 13 on the fixed mold 4r side, but as shown in FIG. 4, the vertical surface 17 ₁ of the wedge member 17 is directly attached. it is also possible by sliding contact with the reference surface 4r ₃ of the stationary mold 4r positioning the end portion 13 ₅ of the return pin 13. Also, the casting mold device is a double mold
The 4r and 4l are not limited to be separated left and right, but may be separated vertically.

C. Effect of the Invention As described above, according to the features of the present invention, in the two-divided casting mold apparatus having the return pin for positioning the push pin, the return pin on the movable mold side is fixed on the fixed mold side. Since it is biased by the wedge member inserted between the return pin and the return pin, it is possible to prevent a gap from being generated between the return pins due to thermal expansion caused by pouring the molten metal. As a result, it is possible to prevent the push-out pin on the movable mold side from excessively protruding toward the product side when the mold is opened, and it is possible to prevent damage or the like of the product due to the push-out pin. In addition, it is not necessary to determine the size of the return pin and the mold in anticipation of a gap due to thermal expansion between both return pins,
It is possible to greatly increase the degree of freedom in the design.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
The figure is a side view of the entire casting mold device, and Fig. 2 is the diagram of Fig. 1.
II-II line view, FIG. 3 is an enlarged view of part III of FIG. 1, 4
The figure shows a modification of the embodiment. 4r… Fixed mold, 4l… Movable mold, 4r ₁ , 4l ₁ … Recessed part, 4r ₃ , 4
l ₃ ... Reference plane, 8 ... Cavity, 12r, 12l ... Extrusion pin, 13 ... Return pin, 13 ₂ ... Step portion, 13 ₅ ... End portion, 14 ... Return pin, 14 ₂ ... Step portion, 17 ... Wedge member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Takeshi Kokusei 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture, Honda Engineering Co., Ltd. (56) Reference JP-A-1-186243 (JP, A) 61-186419 (JP, U) Actual opening Sho-58-51861 (JP, U) Actual opening 61-185554 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A two-divided mold comprising a fixed mold (4r) and a movable mold (4l), and a recess () formed on the divided surfaces of both molds (4r, 4l) to form a cavity (8). 4r ₁ and 4l ₁ ), an extrusion pin (12r, 12l) movably supported by each of the molds (4r, 4l), and an extrusion pin (12r) on the fixed mold (4r) side and It is integrally connected to each of the push pins (12l) on the movable mold (4l) side, and both molds (4l)
Steps (13 ₂ , 14 ₂ ) on the reference surface (4r ₃ , 4l ₃ ) provided on r, 4l)
Or end (13 ₅₎ the by are positioned both extrusion pins (12r, 12l) the recess and the tip of the (4r _1, 4l
_In a casting mold equipped with return pins (13, 14) positioned on the surface of ₁ ), the return pin (14) on the movable mold (4l) side and the fixed mold (4l)
A wedge member (17) is provided between the return pin (13) on the r) side so that the wedge member (17) can move the return pin (14) on the movable mold (4l) side during mold clamping. Positioning mechanism for a push pin in a casting mold, characterized by urging to position on a reference surface (4l ₃ ) on the mold (4l) side.