Mold Equipment

Abstract

To provide a small-sized metal mold device that allows a core to be released from a metal mold by human power.SOLUTION: A metal mold device for molding a core within a mold using sand and allowing a molded core to be released and taken out from the mold, comprises a push-out pin 11 that pushes out a core, a plate 12 that is connected to the push-out pin 11, and movable means 13 that makes the push-out pin 11 move by operating the plate 12. The movable means 13 has an arm 21 and a toggle mechanism 22 that amplifies the force applied to the arm 21. The arm 21 has at least one bend point 21a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a die apparatus for forming a core. [Background technology]

[0002] In recent years, sand cores have been used in the production of castings. For example, when creating hollows or holes in a casting, these cores are made separately from the main mold and placed inside the outer mold.

[0003] In a core molding machine, which is a mold device that forms this core, after molding the core, the ejector pin is operated to release the core from the mold, thereby removing the core.

[0004] Here, Patent Document 1 discloses an extrusion mechanism in a molding machine that uses a mold, which extrudes a molded product by means of an electric toggle mechanism. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-007961 Summary of the Invention [Problem to be solved by the invention]

[0006] When releasing a molded core from a mold in a core molding machine, a large force is required due to the large resistance to release. On the other hand, cores are characterized by low strength because they are formed from sand. Here, when releasing the core from the mold by operating a toggle mechanism with a motor, as in the extrusion mechanism disclosed in Patent Document 1, or when using an actuator to push the core out of the mold, the core's low strength can lead to damage. Furthermore, using an actuator also poses the problem of the actuator equipment becoming larger. Therefore, it is conceivable to manually generate the force required to release the core from the mold and adjust the force applied to the core.

[0007] However, it is difficult to generate the force required to release the core from the mold simply by human power, and therefore, when using human power to release the core from the mold, a mechanism to amplify the force is required, but such a mechanism tends to be large, leaving room for miniaturization.

[0008] The present invention provides a small mold apparatus that allows a core to be manually released from a mold. [Means for solving the problem]

[0009] The mold apparatus of the present invention is a mold apparatus that uses sand to mold a core in a mold and then releases and removes the molded core from the mold, and is equipped with an ejector pin that pushes the core, a plate connected to the ejector pin, and a movable means that operates the ejector pin by moving the plate, the movable means having an arm and a toggle mechanism that amplifies the force applied to the arm, and the arm has at least one bending point. This allows the force acting on the space-saving arm to be amplified when it is manually operated, thereby enabling the core to be pushed out of the mold. [Effects of the Invention]

[0010] This makes it possible to provide a small mold device that allows the core to be manually released from the mold. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a perspective view showing the configuration of a mold device before a movable means is operated. [Figure 2] FIG. 10 is a diagram showing a state in which the arm and the toggle mechanism are connected. [Figure 3] FIG. 10 is a perspective view showing the configuration of a mold device in a state where an arm is manually operated. [Figure 4] FIG. 10 is a perspective view showing the configuration of a mold device in a state where a slide mechanism is operated. DETAILED DESCRIPTION OF THE INVENTION

[0012] Embodiment 1 The mold apparatus according to this embodiment will be described below with reference to the drawings. The mold apparatus 1 is a core molding machine that molds a core in a mold using sand and releases and removes the molded core from the mold.

[0013] Fig. 1 is a perspective view showing the configuration of a mold apparatus 1. As shown in Fig. 1, the mold apparatus 1 includes an ejector pin 11 that pushes a core, a plate 12 to which the ejector pin is connected, a movable means 13 that moves the plate 12, and a frame 14.

[0014] Here, a mold in which a core is formed is disposed in the mold device 1. This mold is disposed so that the core can be released and pushed out from the mold by driving the ejector pin 11.

[0015] The ejector pin 11 is a pin that has one end connected to the plate 12 and extends in a normal direction from the surface of the plate 12. Here, the description will be given assuming that the ejector pin 11 is arranged to extend in the horizontal direction, as shown in FIG.

[0016] Plate 12 is a plate to which ejector pins 11 are connected. Plate 12 is pushed out horizontally by movable means 13, causing ejector pins 11 to push out the cores. Here, the direction in which plate 12 is pushed out by movable means 13 is defined as the forward side.

[0017] The moving means 13 has an arm 21, a toggle mechanism 22 that amplifies the force applied to the arm 21, and a slide mechanism 23 that moves the arm 21 and the toggle mechanism 22 in the horizontal direction.

[0018] 2 shows an example of a state in which the arm 21 is connected to the toggle mechanism 22. One end of the arm 21 is connected to a lever 22a of the toggle mechanism 22, which will be described later. The other end of the arm 21 is gripped by an operator and a force is applied thereto.

[0019] 1, 3, and 4, arm 21 has at least one bending point 21a between one end and the other end, which makes arm 21 longer than when arm 21 is provided in a straight line.

[0020] As shown in FIG. 2, the toggle mechanism 22 has a lever 22a that operates in response to the operation of the arm 21, and a stroke 22b that moves horizontally as the lever 22a moves. Typically, the toggle mechanism 22 is composed of at least two links and one slider, and the slider is provided with the stroke 22b. The toggle mechanism 22 amplifies the force applied by a person to the lever 22a via the arm 21, causing the stroke 22b to move horizontally, i.e., advance. For example, the tip of the stroke 22b abuts against the surface of the plate 12, and as the stroke 22b advances, it presses the plate 12 forward.

[0021] Here, the toggle mechanism 22 has a movable stroke 22b on the slider side, which is one end, and a fixed state on the other end. As a result, in the toggle mechanism 22, when a person applies force to the arm 21 to operate the lever 22a, a force pressing the plate 12 can be applied by the tip of the stroke 22b. At this time, the toggle mechanism 22 operates on the principle of leverage, so that the movement amount of the stroke 22b is shorter than that of the lever 22a, but a strong force can be generated.

[0022] Returning to Fig. 1, the slide mechanism 23 is disposed on the rear side of the toggle mechanism 22. The slide mechanism 23 is an operating part that moves the toggle mechanism 22 together with the arm 21 forward in response to a human operation.

[0023] As a result, the slide mechanism 23 advances the plate 12 connected to the tip of the stroke 22b of the toggle mechanism 22, and moves the ejector pin 11 forward, thereby pushing out the core.

[0024] The frame 14 is a frame that fixes the mold in which the core is formed. As shown in Fig. 1, the frame 14 has a hole that penetrates in the front-rear direction, and the movable means 13 presses the plate 12 forward through this hole.

[0025] As shown in FIGS. 1 and 4, a cutout portion 14a that is cut out so as to open on the rear side is provided in a portion of the frame 14 that has a predetermined length in the front-rear direction.

[0026] For example, since the arm 21 has a predetermined length in the left-right direction, when the arm 21 and the toggle mechanism 22 are advanced using the slide mechanism 23, there is a possibility that they may come into contact with the frame that constitutes the frame 14.

[0027] Here, the notch 14a is formed in a frame that forms the frame 14. When the arm 21 moves forward, the arm 21 fits into the notch 14a. This makes it possible to prevent interference between the arm 21 and the frame 14 by utilizing the notch 14a.

[0028] Next, an example of the operation of the mold device 1 will be described with reference to FIGS.

[0029] 1 shows the state of the mold apparatus 1 before the operation of the movable means 13. At this time, a mold with a core formed therein is set on the frame 14, and the tip of the stroke 22b is connected to the tip of the plate 12. At this time, the core and the mold are not yet separated from each other.

[0030] Figure 3 shows a state in which arm 21 of movable means 13 has been manually operated from the state in Figure 1. Here, arm 21 is pushed forward to advance stroke 22b of toggle mechanism 22. At this time, force is applied to arm 21 of toggle mechanism 22, causing stroke 22b to move short in an increased state, and frame 14 also moves forward a short distance in an increased state.

[0031] Therefore, the ejector pin 11 moves forward a short distance in an increased force state. At this time, when releasing the core from the mold, a large force is required due to mold release resistance, but the ejector pin 11 can release the core from the mold by utilizing the force increased by the toggle mechanism 22.

[0032] Figure 4 shows a state in which the toggle mechanism 22 has been moved forward together with the arm 21 by manually operating the slide mechanism 23 of the movable means 13 from the state shown in Figure 3. At this time, the core has been released from the mold, so there is little resistance when the ejector pin 11 pushes the core. Therefore, by an operator applying a force forward using the slide mechanism 23, the toggle mechanism 22 can be easily moved forward together with the arm 21, and the plate 12 and ejector pin 11 can also be moved forward.

[0033] At this time, the operator operates the slide mechanism 23 to the forward end, which moves the arm 21 and the toggle mechanism 22 to the forward end. Note that, since the frame 14 has the cutout portion 14a, the arm 21 can be moved to the forward end without interfering with the frame 14.

[0034] As a result, the force increased by the toggle mechanism 22 is used to release the core from the mold, and after release, the core is pushed out by the slide mechanism 23 to complete the extrusion. In other words, forward pushing can be performed using the toggle mechanism 22 only at the beginning of core extrusion, when the mold release resistance is greatest, and thereafter forward pushing can be performed by the slide mechanism 23.

[0035] Here, since the push-out length of the ejector pin 11 by the toggle mechanism 22 can be short, an increase in the size of the toggle mechanism 22 itself can be suppressed, and the overall device can be made compact.

[0036] Furthermore, the process of manually releasing the core from the mold can also be carried out using an actuator. Specifically, when releasing the core from the mold by several tens of millimeters, the toggle mechanism 22 can be used, and the remaining stroke can be operated by the actuator. In this case, the force required when the mold release resistance becomes large is generated by the toggle mechanism 22, so there is no need for the actuator to generate a large force. Therefore, a small actuator can be used, allowing the overall device to be made smaller.

[0037] The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the sake of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention.

[0038] In the above description, the stroke 22b of the toggle mechanism 22 is moved forward by advancing the arm 21, but this is not limiting. For example, the stroke 22b of the toggle mechanism 22 may be moved forward when a force is applied to the arm 21 in the rearward direction. [Explanation of symbols]

[0039] 1. Mold equipment 11 ejector pin 12 plates 13 Movable means 14 frames 14a Notch 21 Arm 21a Bend point 22 Toggle mechanism 22a Lever 22b stroke 23 Slide mechanism

Claims

[Claim 1] A molding apparatus that molds a core in a mold using sand and releases the molded core from the mold, An ejector pin that pushes the core; a plate connected to the ejector pin; a movable means for moving the plate to operate the ejector pin, The moving means is an arm, a toggle mechanism that amplifies a force applied to the arm, and an actuator; the arm has at least one bending point; the toggle mechanism is capable of pressing the plate with an initial stroke to release the core from the mold; The actuator is capable of pressing the plate with a remaining stroke portion after pressing by the toggle mechanism. Mold equipment.

Images