JP2018061988A - Core gripping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core gripping device that is able to hinder deterioration of a gripping part that grips a core.SOLUTION: A core gripping device 1 according to the invention has pickers 13a, 13b comprising gripping parts 14a, 14b, respectively, which are able to expand and contract. The pickers 13a, 13b expand the gripping parts 14a, 14b, thereby bringing the gripping parts 14a, 14b into contact with the core 20 and gripping the core 20. The gripping parts 14a, 14b are provided with protective covers 15a, 15b, respectively. The friction coefficient of a contact face 18 between the protective covers 15a, 15b and the gripping parts 14a, 14b is lower than the friction coefficient 17 of a contact face between the protective covers 15a, 15b and the core 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a core gripping device.

  The casting core is a mold used to form a hollow portion in a casting to be produced. Traditionally, the core was manually placed in the mold. However, in recent years, it has become important to arrange the core with high precision in the mold as the casting becomes highly accurate. For this reason, there is a need for a core gripping device that can place the core in the mold with high accuracy.

  Patent Document 1 discloses a technique related to a transport device for transporting a casting core.

Japanese Translation of National Publication No. 05-509071

  As one of the core gripping devices that grip the core, there is a core gripping device that grips the core using a picker that includes a gripping portion that can expand and contract at the tip. In this core gripping device, the core is gripped by expanding the gripping portion and bringing the gripping portion into contact with the core. In such a core gripping device, since the core is gripped by expanding and contracting the gripping portion, it is necessary to use an elastic member for the gripping portion.

  Here, since the core is made of sand, the surface has irregularities, and the friction coefficient of the core surface is high. For this reason, if the core is gripped by bringing the gripping portion made of an elastic member into contact with the core, there is a problem that the gripping portion deteriorates due to friction generated on the contact surface between the core and the gripping portion.

  In view of the above problems, an object of the present invention is to provide a core gripping device capable of suppressing deterioration of a gripping part that grips the core.

  A core gripping device according to the present invention is a core gripping device that grips a core, and includes a picker that includes a gripper that can expand and contract. The picker grips the core by inflating the grip and bringing the grip into contact with the core. The grip portion is provided with a protective cover, and the friction coefficient of the protective cover on the contact surface with the grip portion is lower than the friction coefficient on the contact surface of the protective cover with the core.

  In the core gripping device having the above configuration, a protective cover is provided in the gripping portion so that the friction coefficient on the contact surface with the gripping portion of the protective cover is lower than the friction coefficient on the contact surface with the core of the protective cover. It is composed. Thus, since the friction coefficient in the contact surface of a holding part and a protective cover can be made low, it can suppress that a holding part deteriorates.

  According to the present invention, it is possible to provide a core gripping device capable of suppressing deterioration of a gripping part that grips the core.

It is sectional drawing for demonstrating the core holding | grip apparatus concerning embodiment. It is sectional drawing for demonstrating the detail of the holding part with which the core holding | grip apparatus concerning embodiment is provided. It is sectional drawing for demonstrating the holding part (comparative example) which is not provided with a protective cover. It is a top view which shows the other example of the core which the core holding apparatus concerning embodiment hold | grips. It is sectional drawing which shows the state which the core holding | gripping apparatus concerning embodiment hold | grips the core shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
Drawing 1 is a sectional view for explaining the core grasping device concerning an embodiment. The left diagram of FIG. 1 shows a state before the core gripping device 1 grips the core 20, and the right diagram of FIG. 1 shows a state where the core gripping device 1 grips the core 20.

  As shown in FIG. 1, the core gripping device 1 includes a support portion 10 and pickers 13a and 13b. Each of the pickers 13a and 13b is fixed to the support portion 10 so as to extend downward from the lower surface of the support portion 10 (z-axis minus direction). Since the support part 10 and the pickers 13a and 13b need to grip and support the core, a certain degree of strength is required. For example, the support unit 10 and the pickers 13a and 13b can be configured using a metal material.

  Grip portions 14a and 14b are provided at the tips of the pickers 13a and 13b, respectively. The gripping portions 14a and 14b are configured to be able to expand and contract using a fluid such as gas or liquid (hereinafter, a case where gas is used will be described as an example), and may be configured using an elastic member such as rubber, for example. can do. For example, the gripping portions 14a and 14b can be configured using rubber balloons.

  As shown in FIG. 1, protective covers 15a and 15b are provided on the respective gripping portions 14a and 14b. Each protective cover 15a, 15b is provided so as to cover the entire periphery of the gripping portions 14a, 14b. For example, the grip portions 14a and 14b and the protective covers 15a and 15b are integrated, and when the grip portions 14a and 14b expand and contract, the protective covers 15a and 15b also expand and contract together. Has been. For example, the gripping portions 14a and 14b and the protective covers 15a and 15b can be integrated by bonding the protective covers 15a and 15b to the gripping portions 14a and 14b using an adhesive.

  As shown in FIG. 1, the protective covers 15a and 15b are also provided at the bottoms of the gripping portions 14a and 14b. Therefore, when the core is stored in a mold (not shown), it is possible to suppress the gripping portions 14a and 14b from being deteriorated by heat transmitted from the mold disposed under the core.

  For example, the protective covers 15a and 15b can be replaced. When the protective covers 15a and 15b deteriorate due to friction with the core or heat from the mold, the old protective covers 15a and 15b are removed from the gripping portions 14a and 14b. Thereafter, the protective cover can be replaced by attaching new protective covers 15a and 15b to the gripping portions 14a and 14b.

  Moreover, the friction coefficient in the contact surface with the holding parts 14a and 14b of the protective covers 15a and 15b is configured to be lower than the friction coefficient in the contact surface with the core 20 of the protective covers 15a and 15b. Thereby, since the influence of the friction in the surface of the holding parts 14a and 14b can be reduced, it can suppress that the holding parts 14a and 14b deteriorate. The protective covers 15a and 15b can be configured using an elastic material such as silicone rubber.

  Gas (compressed gas) is supplied to each holding part 14a, 14b via piping (not shown). That is, each gripping part 14a, 14b can be inflated by supplying gas to each gripping part 14a, 14b via a pipe (see the right figure of FIG. 1). Conversely, by pulling out gas from the respective gripping portions 14a and 14b through the pipes, the gripping portions 14a and 14b in an expanded state can be contracted (see the left diagram in FIG. 1).

  Moreover, the support part 10 is comprised so that a movement is possible using a moving means (not shown). Since the pickers 13a and 13b are fixed to the support portion 10, the pickers 13a and 13b fixed to the support portion 10 are moved by moving the support portion 10 using the driving means. For example, the moving unit can move the support unit 10 along the x axis, the y axis, and the z axis. For example, a robot arm can be used as the driving means.

  The core 20 is a mold for forming a hollow portion in a casting, and the core 20 is accommodated in a casting mold by using the core holding device 1 to be cast, so that the casting corresponds to the core 20. A hollow portion having a shape can be formed. For example, the core 20 is formed using sand. In the present specification, the detailed shape of the core is not shown.

  As shown in FIG. 1, the core gripping device 1 according to the present embodiment arranges gripping portions 14 a and 14 b of pickers 13 a and 13 b on both sides of the core 20 (see the left diagram in FIG. 1), and then The gripping portions 14a and 14b are expanded and the gripping portions 14a and 14b (actually in contact with the protective covers 15a and 15b) are brought into contact with the side surfaces of the core 20 to grip the core ( (See the right figure in FIG. 1). That is, the core gripping device 1 includes the pressure (force in the x-axis direction) transmitted from the gripping portions 14a and 14b to the core 20 when the gripping portions 14a and 14b are expanded, and the gripping portions 14a and 14b and the core 20. The core is fixed using a frictional force (force in the z-axis direction) generated between the side surface and the side surface of the core. Therefore, the core gripping device 1 can lift the core 20 in the vertical direction (z-axis direction) while gripping the core 20.

  Here, the core 20 is formed using sand. For example, since the core 20 is formed by solidifying sand having a particle size of about 0.1 mm, the surface has irregularities. For this reason, as shown in FIG. 3, when the gripping portions 14a and 14b are not provided with a protective cover, the surface 19 of the gripping portions 14a and 14b abuts the core 20 and the gripping portions 14a and 14b and the core 20 Friction force acts on the interface. This frictional force is necessary for the gripping portions 14a and 14b to grip the core 20. However, when the core 20 comes into direct contact with the surface 19 of the gripping portions 14a and 14b, the surface of the core 20 is uneven. There was a problem that the gripping portions 14a and 14b deteriorated and the life of the gripping portions 14a and 14b was shortened.

  Therefore, in the core gripping device 1 according to the present embodiment, as shown in FIG. 2, protective covers 15a and 15b are provided on the surfaces of the gripping portions 14a and 14b. By providing the protective covers 15a and 15b as described above, the influence of friction on the surfaces of the gripping portions 14a and 14b can be reduced, and deterioration of the gripping portions 14a and 14b can be suppressed.

  At this time, the friction coefficient at the contact surface 18 with the gripping portions 14a and 14b of the protective covers 15a and 15b is configured to be lower than the friction coefficient at the contact surface 17 with the core 20 of the protective covers 15a and 15b. Yes.

  That is, by forming the surface 18 of the protective cover 15a, 15b on the gripping part 14a, 14b side with a material (for example, silicone rubber) having a smaller friction coefficient than the surface of the core 20, the surface of the gripping part 14a, 14b. It is possible to reduce the frictional force acting on the gripping part 14 and to suppress the gripping parts 14a and 14b from deteriorating.

  Further, the surface 17 on the core 20 side of the protective covers 15a and 15b is made uneven so that the friction coefficient is larger than the surface of the gripping portions 14a and 14b, so that the protective covers 15a and 15b and the core 20 The frictional force acting between the two can be increased, and the gripping force when gripping the core 20 can be improved.

  Thus, by providing the protective covers 15a and 15b, it is possible to suppress the deterioration of the gripping portions 14a and 14b. Further, the gripping force when gripping the core 20 can be improved.

  Although the case where the gripping portions 14a and 14b of the core gripping device 1 grip the core 20 while holding the core 20 has been described above, in the present embodiment, a hole is formed in the core 20. The core may be gripped by inserting a gripping portion into the hole and expanding the hole.

  FIG. 4 is a plan view showing another example of the core gripped by the core gripping device 1 according to the present embodiment. The core 24 shown in FIG. 4 has holes 26a and 26b extending in the vertical direction, and the holes 26a and 26b open in the vertical direction.

  FIG. 5 is a cross-sectional view showing a state in which the core holding device 1 according to the present embodiment is holding the core shown in FIG. 5 shows a cross section of the core 24 shown in FIG. 4 cut along an xz plane passing through the holes 26a and 26b.

  When gripping the core 24, first, the gripping portions 14a and 14b of the pickers 13a and 13b are respectively inserted into the holes 26a and 26b of the core 24 as shown in the left diagram of FIG. Then, as shown in the right diagram of FIG. 5, the gripping portions 14a and 14b inserted in the respective hole portions 26a and 26b of the core 24 are expanded. As a result, the gripping portions 14 a and 14 b (protective covers 15 a and 15 b) abut against the inner walls (side walls) of the holes 26 a and 26 b of the core 24, and the pickers 13 a and 13 b are fixed to the core 24. In the case shown in FIG. 5, the entire side surfaces of the gripping portions 14a, 14b (protective covers 15a, 15b) are in contact with the entire side surfaces of the respective holes 26a, 26b. With such an operation, the core gripping device 1 can grip the core 24.

  Also in the case shown in FIG. 5, since the protective covers 15a and 15b are provided around the gripping portions 14a and 14b, the influence of friction on the surfaces of the gripping portions 14a and 14b can be reduced, and the gripping portions 14a and 14b Deterioration can be suppressed.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited only to the configuration of the above embodiment, and within the scope of the invention of the claims of the present application. It goes without saying that various modifications, corrections, and combinations that can be made by those skilled in the art are included.

DESCRIPTION OF SYMBOLS 1 Core holding | grip apparatus 10 Support part 13a, 13b Picker 14a, 14b Grip part 15a, 15b Protective cover 20, 24 Core 26a, 26b Hole

Claims (1)

A core gripping device for gripping the core,
The core gripping device has a picker including a gripper that can expand and contract,
The picker expands the gripping portion to bring the gripping portion into contact with the core and grips the core,
The gripping part is provided with a protective cover,
The friction coefficient on the contact surface of the protective cover with the grip portion is lower than the friction coefficient on the contact surface of the protective cover with the core,
Core gripping device.

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