JPH0615856U - Die casting machine rod connection structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the force that causes the misalignment between the injection piston rod and the plunger rod acts, the pressing force always acts in the axial direction of both rods It is intended to obtain a connecting structure of a die casting machine capable of preventing breakage of the die. A slide contact surface 8a having a concave spherical shape and a slide contact surface 9a having a convex spherical shape are slid on each other, and two pieces are arranged in the coupling 10 between the ends of both rods 2 and 4. Spacer 8,
9 and a restricting portion 11 formed on the inner peripheral surface of the coupling 10 so as to protrude so as to restrict one of the two spacers 8 and 9 from moving in the radial direction. Further, the two spacers 8 and 9 are formed to have a diameter smaller than the end diameters of the rods 2 and 4, and the spacer 9 is held in the coupling 10 so as to be movable in the radial direction thereof. Has become.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rod connecting structure for a cold chamber type die casting machine in which an injection piston rod and a plunger rod are connected by a coupling.

[0002]

[Prior art]

 FIG. 4 is a partially cutaway side view showing the injection mechanism of the cold chamber type die casting machine. In this figure, reference numeral 1 indicates an injection cylinder, and reference numeral 7 indicates a die mounting plate. In the cold chamber type die casting machine, since the molten metal supplied into the plunger sleeve 6 is injected at high speed and high pressure by the plunger tip 5 attached to the tip of the plunger rod 4, the injection piston rod 2 and the plunger rod 4 of the injection cylinder 1 are injected. It is necessary to keep the axes of each other always aligned. That is, if the axes of the injection piston rod 2 and the plunger rod 4 deviate from each other, the plunger rod 4 or the injection piston rod 2 is easily broken due to the buckling force acting on both rods 2, 4 during injection molding. However, since the plunger rod 4 has a relatively long length in order to obtain a movable stroke, stability is likely to be impaired, and moreover, the plunger rod 4 is likely to be thermally expanded and deformed by the high-temperature molten metal, so that the injection piston rod 2 and the plunger rod 4 are easily deformed. It is difficult to keep the axial center of the rod 4 consistent. Further, a so-called chatter vibration is generated in the plunger rod 4 due to a sudden change in the injection pressure during the injection molding, and this vibration may cause the plunger rod 4 to break due to fatigue.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems, and its purpose is to constantly apply a pressing force in the axial direction of the injection piston rod and the plunger rod even if the axial centers of the ejection piston rod and the plunger rod are deviated. It is intended to obtain a rod connecting structure of a die casting machine capable of effectively preventing breakage of the plunger rod or the injection piston rod by constructing the rod connecting structure.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the rod connecting structure of the die casting machine of the present invention is a die casting machine in which the ejection piston rod and the plunger rod are connected by a coupling. A pair of spacers, which are slidably contacted with each other, between the end of the injection piston rod and the end of the plunger rod in the coupling, and the inner side of the coupling. It is characterized in that it is formed so as to project from the peripheral surface, and that one of the two spacers is provided with a restriction portion that restricts it so as not to move in the radial direction. The two spacers are formed with a diameter smaller than the end diameters of the injection piston rod and the plunger rod, and the other spacer not regulated by the regulation portion moves in the radial direction within the coupling. It may be configured to be retained as possible.

[0005]

[Action]

 Since the present invention is constructed as described above, it operates as follows. The pressing force of the injection piston rod is transmitted to the plunger rod via the two spacers in the coupling. When the axial center of the plunger rod and the injection piston rod is deviated, the plunger rod and the injection piston rod are bent by the coupling which is the connecting portion between them. The two spacers built in this coupling are made by sliding a convex spherical sliding contact surface and a concave spherical sliding contact surface together, and one spacer is radially aligned by the restricting portion. Since it is regulated so that the piston piston rod does not move, the pressing force applied by the injection piston rod always acts in the axial direction of the plunger rod, preventing damage to the rod due to misalignment of the injection piston rod and plunger rod. can do.

Further, the outer diameter of the spacer is formed to be smaller than the end portions of the injection piston rod and the plunger rod, and the other spacer, which is not regulated by the regulation portion, is held movably in the radial direction within the coupling. If this is done, the pressing force from the injection piston rod is buffered by the other spacer and then transmitted to the plunger rod.Therefore, vibration caused by fluctuations in injection pressure at the start of injection molding or during injection molding The impact and the impact are alleviated, and the breakage of the injection piston rod or the plunger rod can be further reduced.

[0007]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to this embodiment. FIG. 1 is a sectional side view of an embodiment of a rod connecting structure of a die casting machine according to the present invention. The rod connecting structure of the die casting machine of the present invention comprises a cylindrical coupling 10 for connecting the injection piston rod 2 and the plunger rod 4, and the injection piston rod 2 and the plunger rod 4 (hereinafter referred to as the injection rod) which is built in the coupling 10. When the piston rod and the plunger rod are written side by side, the two spacers 8 and 9 are arranged between the flanges 12a and 12b formed at the ends of the two rods). The spacer 8 arranged on the injection piston rod 2 side so as to project from the inner peripheral surface of the coupling 10 is regulated so as not to move in the radial direction.

A concave spherical sliding contact surface 8 a is formed on one side of the spacer 8, and a spacer 9 having the same diameter as the spacer 8 is formed on the surface facing the sliding contact surface 8 a. A convex spherical sliding contact surface 9a having the same curvature as the sliding contact surface 8a is formed. The two spacers 8 and 9 are arranged between the flanges 12a and 12b with the sliding contact surfaces 8a and 9a being slid on each other. Further, the spacers 8 and 9 are formed so as to have a smaller diameter than the flanges 12a and 12b, and the spacer 9 can be moved in the cup ring 10 in the radial direction in the unloaded state. A slight space is maintained between the inner peripheral surface of the coupling 10 and the flanges 12a and 12b, and the plunger rod 4 and the injection piston rod 2 swing to the coupling 10 to some extent. You can do it.

FIG. 2 is a schematic view for explaining the action of the connecting mechanism of the present invention, and (a) shows the action direction of the pressing force when the shaft centers C and C ′ of both rods 2 and 4 are aligned. FIG. 6B is a diagram showing the acting direction of the pressing force acting on the plunger rod 4 when the axial centers C and C ′ of the rods 2 and 4 are displaced. In this figure, the acting direction of the pressing force is indicated by an arrow, and the outline of the coupling 10 is indicated by a chain double-dashed line for the sake of explanation.

As shown in FIG. 2A, when the axial centers C and C ′ of both rods 2 and 4 are aligned, the pressing force from the injection piston rod 2 acts in the axial direction of the plunger rod 4. is doing. When the axes C and C'of the rods 2 and 4 deviate, the pressing force applied from the injection piston rod 2 causes the rods 2 and 4 to bend at the connecting portion 3. That is, as shown in FIG. 2B, the flange 12b and the spacer 9 rotate along the sliding contact surface 8a until one end of the flange 12b contacts the inner peripheral surface of the coupling 10. At this time, the pressing force applied from the injection piston rod 2 uniformly acts on the contact surfaces of the spacers 8 and 9, and the acting direction of the force is the spherical center direction of the sliding contact surface 8a. Therefore, the pressing force applied to the plunger rod 4 acts in the axial direction.

FIG. 3 is a partially cutaway schematic view for explaining the action of the spacer 9. In this figure also, the arrow indicates the direction of action of the pressing force. As shown in FIG. 3 (a), the spacer 9 is held between the flange 12b and the spacer 8 in a state in which the spacer 9 is displaced downward due to the action of gravity in an unloaded state such as before the start of injection. As shown in FIG. 3B, when the injection piston rod 2 starts moving to the plunger rod 4 side due to the start of injection molding or the like, the spacer 9 is pressed against the spacer 8 and pushed upward. Then, as shown in FIG. 3C, when the spacer 9 moves to the concentric position of the spacer 8, the pressing force of the injection piston rod 2 is transmitted to the plunger rod 4. As described above, the spacer 9 moves up and down between the flange 12b and the spacer 8 and plays a role of a cushioning material, so that the pressing force due to the shock at the start of injection and the fluctuation of the injection pressure is abrupt. It has the effect of absorbing changes and suppressing the occurrence of so-called chatter vibrations.

[0012]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. Even if the axial centers of the injection piston rod and the plunger rod deviate, the pressing force always acts in the axial direction of the respective rods, so even if injection molding is repeated, the rods will not easily break, and the plunger rod and injection rod Not only can the life of the piston rod be extended, but also accidental accidents due to broken rods can be prevented. Further, by holding either one of the spacers movably in the coupling, the impact when the pressing force is applied to this spacer and the fluctuation of the pressing force are alleviated to further reduce the breakage of the rod. Will be able to.

[Brief description of drawings]

1 is a cross-sectional side view of an embodiment of the present invention.

FIG. 2 is a schematic view of a connecting mechanism for explaining the operation of the present invention, (a) shows the acting direction of the pressing force when the rods have the same shaft center, and (b) shows both. It is a figure which shows the operating direction of the pressing force in the state where the axial center of the rod shifted.

FIG. 3 is a partially cutaway schematic view illustrating the action of a spacer.

FIG. 4 is a partially cutaway side view showing an injection mechanism of a cold chamber type die casting machine.

[Explanation of symbols]

 1 Injection Cylinder 2 Injection Piston Rod 3 Rod Connection 4 Plunger Rod 5 Plunger Tip 6 Plunger Sleeve 8 and 9 Spacers 8a and 9a Sliding Contact Surface 10 Coupling 11 Restriction 12a and 12b Flange

Claims (2)

[Scope of utility model registration request] 1. A die casting machine in which an injection piston rod and a plunger rod are connected by a coupling, wherein a concave spherical sliding contact surface and a convex spherical sliding contact surface are brought into sliding contact with each other, and And two spacers arranged between the end portion of the injection piston rod and the end portion of the plunger rod, and one of the two spacers protrudingly formed on the inner peripheral surface of the coupling. A rod connecting structure for a die casting machine, comprising: a regulating portion that regulates one spacer so as not to move in the radial direction thereof. 2. The two spacers are formed with a diameter smaller than the end diameters of the injection piston rod and the plunger rod, and the other spacer not regulated by the regulation portion has a radial direction within the coupling. The rod connecting structure of the die casting machine according to claim 1, wherein the rod connecting structure is movably held by the rod.