JP2013141693A - Horizontal injection die casting device and die casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal injection die casting device in which the intrusion of a molten metal into a clearance between the outer circumferential face of a plunger tip and the inner peripheral face of a sleeve hole can be prevented.SOLUTION: The horizontal injection die casting device 1 includes: a fixed die 3; a movable die 4 of defining a cavity 7 together with the fixed die 3; a sleeve 9 having a molten metal supply hole and fitted to the fixed die 3; and a plunger tip 10 advancing to a horizontal direction within the sleeve 9 and injecting the molten metal toward the cavity 7. The sleeve 9 has a sleeve hole 9B, and the diameter D2 of the sleeve hole 9B in the most advanced position of the plunger tip 10 is formed so as to be smaller than the diameter D1 on a side of the rear end 9B1 of the sleeve hole 9B.

Description

  The present invention relates to a lateral injection die casting apparatus and a die casting method using the apparatus, and in particular, a lateral injection die casting apparatus that moves a plunger tip in a horizontal direction within a sleeve and injects a molten metal laterally toward a mold cavity. And a die casting method using the apparatus.

  A lateral injection die casting apparatus using an integrated sleeve in which a sleeve is integrally formed from a hot water supply hole to the inside of a fixed mold of a mold is known from Patent Document 1 below.

  In the horizontal injection die casting device, molten metal is supplied into the sleeve from a hot water supply hole formed in the sleeve, and when the injection cylinder is driven, the plunger tip slides in the sleeve via the cylinder rod, and the molten metal is injected into the cavity of the mold. Fill inside. Here, sliding between the inner peripheral surface of the sleeve and the outer peripheral surface of the plunger tip needs to have an appropriate resistance. If the clearance between the two is too large, the molten metal penetrates into the clearance and solidifies, so-called galling occurs. The galling that occurs in the sliding portion reduces the life of the injection member and also reduces the quality of the die-cast product. In recent years, the die casting method has been used to shorten the filling time and minimize the temperature drop of the molten metal to improve the quality of the product. However, when the injection speed is increased, surge pressure is generated due to the impact at the completion of injection. Therefore, there is a possibility that a so-called backflush in which the molten metal is inserted into the clearance between the outer peripheral surface of the plunger tip and the inner peripheral surface of the sleeve. Therefore, it is preferable that there is an appropriate sliding resistance that does not cause galling or backflushing. However, if the sliding resistance is too large, the smooth reciprocation of the plunger tip is hindered, so the clearance needs to be maintained at an appropriate level.

Japanese Patent Laying-Open No. 2010-120072 (FIG. 7)

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to prevent the molten metal from being inserted into the clearance between the outer peripheral surface of the plunger tip and the inner peripheral surface of the sleeve. It is an object to provide an injection die casting apparatus and a die casting method performed using the apparatus.

  The present invention has been made to solve the above problems, and a lateral injection die casting apparatus 1 according to the present invention includes a fixed mold 3, a movable mold 4 that defines a cavity 7 together with the fixed mold 3, and a hot water supply. Lateral injection die casting apparatus comprising a sleeve 9 having a hole and fitted in the fixed mold 3 and a plunger tip 10 for advancing the inside of the sleeve 9 in the horizontal direction and injecting molten metal toward the cavity 7 1, the sleeve 9 has a sleeve hole 9B, and the diameter D2 of the sleeve hole 9B at the most advanced position of the plunger tip 10 is smaller than the diameter D1 on the rear end portion 9B1 side of the sleeve hole 9B. It is characterized by.

  In addition, the die casting method according to the present invention is characterized in that die casting is performed using the above-described lateral injection die casting apparatus 1.

  The lateral injection die casting apparatus and the die casting method of the present invention have an effect of preventing the molten metal from being inserted into the clearance between the outer peripheral surface of the plunger tip and the inner peripheral surface of the sleeve hole.

Sectional drawing which shows the principal part of the apparatus for horizontal injection die-casting in one Embodiment of this invention. The expanded sectional view of the sleeve periphery of the apparatus for lateral injection die casting in the same embodiment.

  A lateral injection die casting apparatus 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the lateral injection die casting apparatus 1 includes a die casting mold 2 including a fixed mold 3 and a movable mold 4. Further, the lateral injection die casting apparatus 1 includes a fixed platen 5 that supports the fixed mold 3 and a movable platen 6 that supports the movable mold 4. The movable mold 4 and the movable platen 6 are configured to be movable in the moving direction of the movable mold 4 (the mold opening direction of the die casting mold 1) indicated by arrows A ← → A ′. In the mold closing state shown in FIG. 1, the cavity 7 and the runner 8 are defined by the fixed mold 3 and the movable mold 4.

  The sleeve 9 is an integral sleeve, and the distal end side is fitted to the fixed mold 3. The fixed mold 3 is formed with a sleeve insertion hole 3A, and a sleeve 9 is fitted into the sleeve insertion hole 3A. The fixed platen 5 is also formed with a sleeve insertion hole 5A, and the sleeve 9 is also fitted into the sleeve insertion hole 5A. On the rear end side of the sleeve 9, a hot water supply hole 9A for supplying a molten metal such as an aluminum alloy through a ladle (not shown) is formed. A plunger tip 10 is disposed in the sleeve 9. The plunger tip 10 is connected to an injection cylinder mechanism (not shown) via a plunger rod 11, and is configured to be movable in the horizontal direction in the sleeve 9. The plunger tip 10 injects a molten metal such as an aluminum alloy supplied into the sleeve 9 from the hot water supply hole 9 </ b> A toward the cavity 7. The molten metal is filled into the cavity 7 through the sleeve hole 9 </ b> B of the sleeve 9 and the runner 8.

  As shown in FIG. 2, the sleeve hole 9 </ b> B includes a basic diameter portion 9 </ b> B <b> 1 that extends from the rear end portion to a portion that is fitted to the fixed mold. The diameter D1 (for example, φ140.025 mm) of the basic diameter portion 9B1 is set to have a clearance that allows the plunger tip 10 to slide smoothly. Further, the sleeve hole 9B is provided with a first taper portion 9B2 in a portion fitted to the fixed mold, and the diameter of the sleeve hole 9B is gradually reduced from the position indicated by X in FIG. Yes. Then, at the position indicated by Y, it reaches a reduced diameter portion 9B3 having a diameter D2 (for example, φ139.97 mm). A second taper portion 9B4 for forming a biscuit portion in a die-cast product is formed at the front end portion of the sleeve hole 9B, and the diameter of the sleeve hole 9B gradually increases toward the front. When the molten metal is injected toward the cavity 7 by the plunger tip 10, the plunger tip 10 is guided by the first taper portion 9B2 and the whole enters the reduced diameter portion 9B3. When the plunger tip 10 reaches the most advanced position of the reduced diameter portion 9B3 and the injection of the molten metal is completed, a surge pressure is generated due to an impact at the completion of the injection, and the molten metal is brought into contact with the outer peripheral surface of the plunger tip 10 and the inner peripheral surface of the front end portion 9B3. Although the clearance between the outer peripheral surface of the tip of the plunger tip 10 and the inner peripheral surface of the reduced diameter portion 9B3 is set to 0.2 mm or less, the insertion of the molten metal is prevented. can do. The diameter D1 of the basic diameter portion 9B1 corresponds to the diameter on the rear end side of the present invention.

  Next, a die casting method using the lateral injection die casting apparatus 1 will be described. In the die casting method, first, the movable mold 4 is moved with respect to the fixed mold 3 to perform clamping, and the cavity 7 is defined by the fixed mold 3 and the movable mold 4. Next, the molten metal is supplied into the sleeve 9 from the hot water supply hole 9A. Next, the plunger tip 10 is advanced to the reduced diameter portion 9B3 by an injection cylinder mechanism (not shown) to inject the molten metal toward the cavity 7. Next, the movable die 4 is moved to open the die, and the die-cast product is pushed out from the movable die 4 by an unillustrated extrusion pin to take out the die-cast product. Then, the plunger tip 10 is moved backward by the injection cylinder mechanism. The above is the die casting method.

  According to the die casting method using the side injection die casting apparatus 1, when the plunger tip 10 reaches the most advanced position in the sleeve 9 and the injection of the molten metal is completed, a surge pressure is generated by an impact at the completion of the injection, and the molten metal is moved to the plunger tip. 10 and the inner peripheral surface of the sleeve hole 9B, the diameter-reduced portion 9B3 which is the most advanced position of the plunger tip 10 is made smaller in diameter than the rear end portion, and the plunger tip 10 Since the clearance between the outer peripheral surface of the sleeve and the inner peripheral surface of the sleeve hole 9B is set small, the molten metal is prevented from being inserted. Therefore, it is possible to smoothly repeat the die casting method while preventing the plunger tip 10 from being galled and backflushing.

  The lateral injection die casting apparatus and the die casting method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, in the above-described embodiment, when the plunger tip 10 reaches the most advanced position, the entire plunger tip 10 has entered the reduced diameter portion 9B3 of the sleeve hole 9B. What is necessary is just to be comprised so that at least the front-end | tip of the plunger chip | tip 10 may approach into the diameter reducing part 9B3, when reaching a position.

DESCRIPTION OF SYMBOLS 1 Side injection die casting apparatus 2 Die casting die 3 Fixed mold 3A Sleeve insertion hole 4 Movable type 5 Fixed platen 5A Sleeve insertion hole 6 Movable platen 7 Cavity 8 Runner 9 Sleeve 9A Hot water supply hole 9B Sleeve hole 9B1 Basic diameter part 9B2 1st taper Part 9B3 Reduced diameter part 9B4 Second taper part 10 Plunger tip 11 Plunger rod

Claims (2)

  A fixed mold, a movable mold that defines a cavity together with the fixed mold, a sleeve having a hot water supply hole and fitted in the fixed mold, and advancing in the sleeve in the horizontal direction to direct the molten metal toward the cavity In a lateral injection die casting apparatus comprising a plunger tip for injection, the sleeve has a sleeve hole, and the diameter of the sleeve hole at the most advanced position of the plunger tip is larger than the diameter on the rear end side of the sleeve hole. An apparatus for lateral injection die casting, characterized in that it is formed to be small.   A die casting method, wherein die casting is performed using the lateral injection die casting apparatus according to claim 1.

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