Gripping member

Abstract

The present invention provides a gripping member capable of suppressing localized temperature drops that occur at the contact point with the gripping member when transporting a hot forging material heated to a predetermined temperature in a heating furnace. [Solution] A gripping member 1 is provided in a pair on a transport manipulator and grips a heated hot forging material by moving in opposition to each other. The gripping member 1 comprises a metal base 1b, a refractory molding material 2 provided on the gripping portion for gripping the hot forging material, and fixing members 3a, 3b, 3c for fixing the refractory molding material to the base. The refractory molding material is positioned between the base and the hot forging material. An inorganic refractory molding material such as high heat-resistant inorganic castable can be used as the refractory molding material, and ceramic particles may be attached to the surface. Furthermore, by arranging inorganic fibers on the material side of the ceramic particles, the heat insulation effect, surface pressure distribution effect, and anti-seize effect can be further enhanced.

Description

Technical Field

[0004] , , , ,

[0001] The present invention relates to a gripping member provided in a transfer manipulator for gripping a heated material for hot forging.

Background Art

[0002] When hot-forging a material for hot forging heated to the hot-forging temperature, there is a problem of deterioration of hot-workability due to a temperature drop of the material for hot forging. Therefore, various proposals for preventing temperature drops have been made conventionally. For example, in Japanese Patent No. 5988442, glass woven fabric and glass particles are arranged in order on a material for hot forging, and glass coating is applied to the material for hot forging to prevent hot cracking. Further, Japanese Patent No. 5532148 discloses an invention in which the entire portion in contact with the lower die is covered with a metal heat-insulating member, and then the forging member and the metal heat-insulating member are forged integrally.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described in Patent Document 1 and Patent Document 2 mentioned above, most of the methods for preventing a temperature drop of a material for hot forging are proposals for coating the surface of the material for hot forging with something effective for preventing a temperature drop. On the other hand, almost no consideration has been given to preventing a temperature drop in a gripping member that directly contacts a hot-forging material in a manipulator that transfers a material for hot forging. The objective of this invention is to provide a gripping member for a manipulator that can reduce localized temperature drops in the portion gripping the hot forging material when the hot forging material, heated to a predetermined temperature in a heating furnace, is transported to a hot forging apparatus. [Means for solving the problem]

[0005] This invention was made in view of the above-mentioned problems. In other words, the present invention relates to a gripping member provided in a transport manipulator for gripping a heated material for hot forging, wherein the gripping member is provided with a refractory molding material on the side that comes into contact with the hot forging material. In the gripping member of the present invention, ceramic particles may be attached to the surface of the refractory molded material. More preferably, the gripping member has inorganic fibers formed on the side where the ceramic particles come into contact with the hot forging material. [Effects of the Invention]

[0006] According to the gripping member of this invention, when transporting a hot forging material heated to a predetermined temperature in a heating furnace to a hot forging apparatus, it is possible to reduce the localized temperature drop in the portion gripping the hot forging material. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram showing an example of a fire-resistant molded material. [Figure 2] This is a schematic diagram showing an example of a gripping member equipped with a fire-resistant molded material. [Figure 3] This is a schematic diagram showing an example of a gripping member equipped with a fire-resistant molded material of a different shape. [Figure 4] This is a schematic diagram showing an example of a gripping member equipped with a plate-shaped fire-resistant molded material. [Figure 5] This is a schematic diagram showing an example of a gripping member with a different configuration, which includes a plate-shaped fire-resistant molded material. [Modes for carrying out the invention]

[0008] This invention relates to a gripping member provided in a transport manipulator for gripping heated hot forging material. The material to be subjected to hot forging (hot forging material) is heated to a predetermined temperature in a heating furnace. Some materials targeted for hot forging are relatively difficult to hot work, and typical examples include Ti alloys and Ni-based alloys. For example, a Ni-based alloy containing 40% by mass of Ni and having a composition in which a gamma prime phase precipitates may be heated to a high temperature of about 950 to 1250°C prior to hot forging. Generally, the hot forging material heated in this way is grasped by a gripping member provided on a manipulator that transports it and transported to the hot forging apparatus. However, during this transport process, a localized temperature drop may occur in the area in contact with the gripping member. As a result, temperature unevenness may occur in the material immediately before hot forging, which may lead to a decrease in workability. Therefore, in this invention, a refractory molding material is provided on the gripping portion of the gripping member that grips the material for hot forging, thereby suppressing a localized temperature drop in the gripping portion. The gripping member according to this invention will be described in detail below with reference to the drawings.

[0009] Figure 2 is a schematic diagram showing an example of a gripping member 1 provided on a conveying manipulator for gripping a material for hot forging. The gripping members 1 provided on the conveying manipulator are usually used in pairs, left and right, and the material for hot forging is gripped by the opposing movement of both gripping members 1. Figure 1 shows one of the gripping members, and the other gripping member, which is not shown, has basically the same configuration. In this invention, a refractory forming material 2 is provided in the portion of the gripping member 1 that contacts and grips the hot forging material (hereinafter referred to as the "gripping portion"). This prevents the metal portion of the gripping member 1 from directly contacting the hot forging material, thereby reducing the localized temperature drop of the hot forging material caused by heat transfer to the gripping member 1. The aforementioned refractory molding material 2 is formed into a desired shape using, for example, a highly heat-resistant inorganic amorphous refractory material such as refractory mortar or high-alumina refractory castable. These refractory molding materials are suitable for use in gripping parts that come into direct contact with high-temperature hot forging materials, as they can also be expected to reduce the temperature drop of the hot forging material and distribute surface pressure. Furthermore, even if a part is worn or damaged after multiple uses, it can be easily repaired by adding or partially replacing the same material.

[0010] The form of the refractory molding material 2 used in this invention will be described with reference to Figure 1. Figure 1(A) is an example in which the material is pre-formed to conform to the shape of the hot forging material, and when a round bar-shaped hot forging material is gripped, the effect of reducing temperature drop can be obtained more reliably. Figure 1(B) is an example in which a V-shaped groove is formed on the gripping surface, and by appropriately reducing the contact area between the round bar-shaped or rectangular parallelepiped hot forging material and the refractory molding material 2, the effect of reducing local temperature drop of the hot forging material can be more reliably achieved. Figures 2 and 3 show specific examples of the gripping member 1 using the fire-resistant molded material 2 shown in Figure 1(B). The gripping member 1 of the present invention has a base portion 1b of the gripping member provided on the manipulator and a mounting portion 1a that is detachably provided to the base portion 1b, and the fire-resistant molded material 2 is arranged on the mounting portion 1a.

[0011] The gripping member 1 shown in Figures 2 and 3 has a mounting portion 1a detachably positioned on the upper surface of the base portion 1b, and a refractory molded material 2 is provided on the gripping surface of the mounting portion 1a. When gripping a hot forging material (not shown) by opening and closing the gripping member 1 in the left and right directions, it is necessary to securely hold the mounting portion 1a with the base portion 1b using a fixing member 3 to prevent the refractory molded material 2 and the mounting portion 1a equipped with the refractory molded material 2 from falling. Specifically, as shown in the examples in Figures 2 and 3, a frame 3b is provided that presses against the side edge of the fire-resistant molded material 2, and this is connected to the base 1b via a frame fixing member 3c, and further fastened together with a fastening member 3a (bolt, screw, etc.). This configuration ensures that the mounting part 1a does not come loose and maintains its position. However, as long as the function of preventing falling is achieved, the system is not limited to the frame 3b, fastening member 3a, and frame fixing member 3c, and alternative mechanisms and components may be used.

[0012] Furthermore, as shown in Figure 2, ceramic particles 4 can be attached to the upper surface of the refractory molding material 2 as needed. During gripping, the ceramic particles 4 and the refractory molding material 2 form a thin air layer, and this air layer reduces heat transfer from the hot forging material to the gripping member 1, functioning as a so-called heat insulating layer. In addition, if hard particles such as alumina, zirconia, or mullite are used among these ceramic particles, a thin sacrificial hard layer is formed on the surface, and the ceramic particles absorb the wear and impact with the hot forging material, thereby reducing cracking and wear of the base material (refractory molding material). Moreover, since ceramic particles do not react easily with metal (hot forging material) and do not easily wet even at high temperatures, the risk of chipping and peeling due to high-temperature adhesion is reduced, and the lifespan of the gripping member provided on the manipulator can be extended. Furthermore, in the embodiment shown in Figure 3, by arranging inorganic fibers 5 (e.g., glass fibers, ceramic fibers, alumina fibers, etc.) on the upper surface of the refractory molding material 2 on the material side of the ceramic particles 4, a fiber layer is interposed between the refractory molding material 2 and the hot forging material. This provides a surface pressure distribution effect due to its ability to conform to minute irregularities, as well as an anti-seize effect. In addition, these inorganic fibers 5 act as a buffer layer against rapid temperature changes when the hot forging material is gripped, mitigating the thermal shock that occurs in the refractory molding material 2. With the above configuration, the mounting portion 1a, which includes the refractory molding material 2, is firmly held to the base portion 1b by the fixing members 3 (3a, 3b, 3c), providing stable durability and a temperature drop suppression effect when gripping materials for hot forging.

[0013] Next, the embodiment shown in FIG. 4 is to attach the plate-shaped refractory forming material 2 to the gripping member 1, and it has a simple structure without providing V-shaped or U-shaped grooves. The refractory forming material 2 is disposed on the upper surface of the base portion 1b that forms the gripping surface, and is held from above 3d, front side 3e, and below 3f by a U-shaped fixing device (fall prevention device) 3. On the side surface of the base portion 1b on the side opposite to the side where the refractory forming material 2 is disposed, the fixing member 3 itself can be made detachable so that the U-shaped fixing device 3 is connected. Thereby, it can be easily removed and reattached even when replacing or repairing the refractory forming material 2. This configuration has the advantage that the preparation man-hours and the cost of manufacturing the jig can be reduced because the shape processing of the refractory forming material 2 can be minimized.

[0014] The embodiment shown in FIG. 5 has an even simpler structure in which the plate-shaped refractory forming material 2 is clamped and fixed to the gripping member 1 by a metal wire (wire) 3g. The refractory forming material 2 is positioned on the attachment portion 1a, and by winding the metal wire 3g around and locking it to the outer periphery of the gripping member 1b, the fall of the refractory forming material 2 and the attachment portion 1a is prevented. Since the metal wire 3g does not require a dedicated frame or fastener, the preparation cost is low and it can be replaced in a short time. On the other hand, the durability and dimensional holding accuracy in long-term use are limited, and when the wear and tear of the refractory forming material 2 progress, it is preferable to operate on the premise of disposable (replacement).

[0015] According to the gripping member of the present invention described above, when gripping and transporting a heated hot forging material, it is possible to reduce the local temperature drop in the gripping portion of the hot forging material. Therefore, it is effective when applied to the hot forging of difficult-to-machine materials such as Ni-based super heat-resistant alloys and Ti alloys, which are likely to have a reduced hot forging property due to a temperature drop.

Explanation of Reference Numerals

[0016] 1 Gripping member 1a Attachment portion 1b Base portion 2 Refractory forming material 3 Fixing member 3a Fixing member (fastening member) 3b Fixed member (frame) 3c Fixing member (frame fixing member) 3D fixing member (upper fixing member) 3e Fixing member (front fixing member) 3f Fixing member (lower fixing member) 3g fixing component (thin metal wire) 4. Ceramic particles 5. Inorganic Fibers

Claims

1. A gripping member provided on a transport manipulator for gripping a heated material for hot forging, wherein the gripping member is provided with a refractory molding material on the side that comes into contact with the hot forging material.

2. The gripping member according to claim 1, wherein ceramic particles are attached to the surface of the refractory molded material.

3. The gripping member according to claim 2, wherein inorganic fibers are further formed on the side of the ceramic particles that comes into contact with the hot forging material.

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