Extrusion press device and extrusion press method

Abstract

To provide an extrusion press device that can prevent a constitutive element of the extrusion press device from eroding, while preventing a molded product from oxidizing.SOLUTION: An extrusion press device (1, 2) comprises: a molding part (10) that has a container (11) in which a molded material (BL) is stored; a die (17) that molds the molded material (BL) while extruding the material forward; a pressure ring (21) that receives pressing force from the die (17) and an end platen (23) holding the pressure ring (21); a rear face facility (50) in which post-processing is performed to a molded product (MP) molded by the molding part (10); a gas supply tool (30) that supplies inert gas (N) to a gas chamber (GR) that is a hollow part arranged closer to a rear side than the die (17) in the molding part (10, 70); and a water cooling place (51), provided on the rear face facility (50), into which the molded product (MP) is introduced.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an extrusion press apparatus suitable for extruding metals, particularly copper and copper alloys. [Background technology]

[0002] To extrude a metal material using an extrusion press, a heated billet is pressed against a die to obtain a long extrusion. Typical metal materials that can be extruded include copper and copper alloys, as well as aluminum and aluminum alloys. Copper and copper alloys will be collectively referred to as copper alloys, and aluminum and aluminum alloys will be collectively referred to as aluminum alloys.

[0003] During extrusion, the billet, which is the material to be extruded, is heated, and the extruded product is prone to oxidation. For example, if the extruded product is a copper alloy, a black oxide film forms on the surface of the extruded product. To prevent oxidation of the extruded product, a non-oxidizing extrusion method is known, in which the extruded product is immersed in water in post-processing equipment, as disclosed in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 61-42418 [Patent Document 2] Japanese Patent Application Publication No. 2023-67735 [Patent Document 3] Japanese Patent Publication No. 2023-48407 Summary of the Invention [Problem to be solved by the invention]

[0005] Although this non-oxidizing extrusion is effective in suppressing oxidation of the molded product, water is a cause of corrosion of the components of the extrusion press equipment.

[0006] In view of the above, an object of the present invention is to provide an extrusion press device that can suppress oxidation of a molded product while suppressing corrosion of the components of the extrusion press device. [Means for solving the problem]

[0007] The extrusion press device of the present invention is a molding unit including at least a container for storing a molding material, a die for extruding the molding material forward while receiving a pressing force from behind, a pressure ring for receiving a pressing force from the die, and an end platen for holding the pressure ring; a rear equipment for performing post-processing on the molded product molded in the molding section; a gas supplier that supplies an inert gas to a gas chamber that is a hollow portion in the molding section where the pressure ring and the end platen communicate with each other; A water-cooled environment is provided in the rear equipment where the molded products are introduced. Equipped with.

[0008] The molding part is It is preferable that the molding machine has a stem that applies a pressing force to the workpiece in a forward direction.

[0009] The molding part is The molded product is formed by indirect extrusion. Equipped with a die stem between the die and pressure ring, The gas supply is It is preferable to supply an inert gas to a gas chamber, which is a hollow portion communicating with the die stem, pressure ring, and end platen.

[0010] Extrusion press method: The water cooling environment is a water tank. It is preferred to provide water jet nozzles for generating a water curtain behind which the inlet for the moldings in the bath is blocked.

[0011] The present invention provides an extrusion press method for extruding a workpiece accommodated in a container forward through a die, the method comprising: A first step of transporting the molded product extruded from the die to a post-processing facility in an inert gas atmosphere where the molded product is subjected to post-processing; A second step of water-cooling the molded product in the rear equipment is provided.

[0012] The workpiece is preferably It is copper or a copper alloy. [Effects of the Invention]

[0013] According to the present invention, oxidation of the molded product is suppressed by water-cooling the molded product in the rear equipment, and the molded product can be placed in an inert gas atmosphere in the molding section. Therefore, according to the present invention, corrosion of elements involved in molding can be suppressed in the molding section, and oxidation of the molded product can be suppressed in the molding section and rear equipment, and the molded product can be quickly cooled in the rear equipment. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing the configuration of an extrusion press device according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing the extrusion press device in the first embodiment at the beginning of extrusion. [Figure 3] FIG. 2 is a cross-sectional view showing the extrusion press device in the final stage of extrusion in the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the configuration of an extrusion press device according to a second embodiment. [Figure 5] FIG. 10 is a cross-sectional view showing an extrusion press device during extrusion in a second embodiment. [Figure 6] FIG. 10 is a cross-sectional view showing the extrusion press device at the end of extrusion in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described below include a first embodiment and a second embodiment. The first embodiment relates to an extrusion press apparatus 1 that obtains a molded product by direct extrusion, and the second embodiment relates to an extrusion press apparatus 2 that obtains a molded product by indirect extrusion. Both the extrusion press apparatus 1 and the extrusion press apparatus 2 supply an inert gas, typically nitrogen gas, to the area directly involved in extrusion molding, and expose the molded product to water in the area of ​​the rear equipment downstream of that area. By doing so, the extrusion press apparatus 1 and the extrusion press apparatus 2 can suppress oxidation of the molded product while suppressing corrosion of the components involved in extrusion molding. Below, the extrusion press apparatus 1 according to the first embodiment and the extrusion press apparatus 2 according to the second embodiment will be described in that order.

[0016] [First embodiment: Figures 1, 2, and 3] As shown in Fig. 1, the extrusion press apparatus 1 is divided into a forming section 10 and a rear equipment 50 downstream of the forming section 10. The forming section 10 includes mechanical elements involved in the extrusion forming of a billet BL, which is the material to be extruded, and the rear equipment 50 cools the formed product MP discharged from the forming section 10 while preventing oxidation. During forming in the extrusion press apparatus 1, nitrogen gas N is supplied to the forming section 10, and the formed product MP is exposed to water in the rear equipment 50. In the extrusion press device 1, the side marked with (F) is defined as the front or downstream side, and the side marked with (R) is defined as the rear or upstream side. The definitions of front, rear, upstream, and downstream are relative.

[0017] [Molding section 10: see Figure 1] The forming section 10 comprises a container 11 that accommodates the billet BL at a fixed position, a stem 13 that applies extrusion pressure to the billet BL accommodated in the container 11, and a dummy block 15 attached to the tip of the stem 13.

[0018] The forming unit 10 includes a die 17 provided on the front end surface of the container 11, a backer 19 that contacts the front end surface of the die 17 and supports the die 17 in the front-to-rear direction, a pressure ring 21 that contacts the front end surface of the backer 19, and an end platen 23 that houses and holds the pressure ring 21 in a fixed position. The backer 19, pressure ring 21, and end platen 23 are cylindrical members, and their respective hollow portions are connected to each other. The pressure ring 21 is provided with a gas supply path 33 that introduces nitrogen gas N supplied from a gas supplier 30 (described later) into the hollow portion. Note that, as long as the nitrogen gas N can be introduced into the hollow portion, the gas supply path 33 does not necessarily have to pass through the pressure ring 21. In other words, in the present invention, the nitrogen gas N can be supplied via elements involved in extrusion molding that are located ahead of the die 17. In this embodiment, the die 17, backer 19, pressure ring 21, and end platen 23 are elements involved in extrusion molding, and are targets for corrosion prevention by supplying nitrogen gas N. Other elements may be provided in addition to these elements. A discharge tube 25 having a smaller diameter than the end platen 23 is provided on the front end surface of the end platen 23, providing resistance to the discharge of the nitrogen gas N. The nitrogen gas N leaks to the outside through the discharge tube 25 from the most downstream side of the gas chamber GR (described later). Therefore, supplying nitrogen gas N from a more upstream side of the gas chamber GR is advantageous for spreading the nitrogen gas N throughout the entire gas chamber GR.

[0019] When the stem 13 is pushed forward by, for example, a hydraulic cylinder (not shown), extrusion pressure is applied forward, i.e., toward the die 17, to the billet BL contained in the container 11 via the dummy block 15. The die 17 is pressed against the container 11 by the end platen 23 via the backer 19 and the pressure ring 21, so the billet BL passes through the die hole 17A formed in the die 17 and becomes a molded product MP having a cross-sectional shape that follows the shape of the die hole.

[0020] The billet BL is inserted into the container 11 in a preheated state. To maintain the temperature of the billet BL during molding, a heating means (not shown) is arranged inside the container 11, and the die 17 is also heated from its outer circumferential surface by the heating means. A heating means (not shown) for this heating may be provided around the die 17. A specific example of this heating means is disclosed in Patent Document 2. In addition, a product guide (not shown) is provided to guide the molded product MP extruded from the die 17 to the initial table 57 of the rear equipment 50, and extends to the gas chamber GR and the initial table 57. A specific example of the product guide is disclosed in Patent Document 3. This product guide is also provided in the second embodiment.

[0021] The molding section 10 is equipped with a gas supplier 30 that supplies nitrogen gas, which is an inert gas. The gas supplier 30 supplies nitrogen gas N to a region in the molding section 10 through which the molded product passes during extrusion molding. The gas supplier 30 includes a gas supply source 31 that stores nitrogen gas N, a gas supply path 33 through which the nitrogen gas N stored in the gas supply source 31 flows to a supply destination, and an on-off valve 35 provided along the gas supply path 33. One end of the gas supply path 33 is connected to the gas supply source 31, and the other end is connected to the pressure ring 21, which is the gas supply destination. When the on-off valve 35 is open (ON), the nitrogen gas N passes through the gas supply path 33 and is supplied to the hollow spaces inside the backer 19, the pressure ring 21, and the end platen 23. As explained above, the gas supply path 33 does not necessarily have to be connected to the pressure ring 21 as long as the nitrogen gas N can be introduced into the hollow spaces inside the backer 19, the pressure ring 21, and the end platen 23. Because the hollow portions of the backer 19, pressure ring 21, and end platen 23 are connected, the supplied nitrogen gas fills these hollow portions, with some of it leaking out from the front end of the end platen 23. This hollow portion is in contact with the front end surface of the die 17, allowing the area ahead of the die 17 to be filled with nitrogen gas. Note that this hollow portion will be referred to as the gas chamber GR below. The nitrogen gas N supplied to the gas chamber GR fills the gas chamber GR from its upstream end to its downstream end, but some of it is discharged from the downstream end of the gas chamber GR.

[0022] [Rear equipment 50: See Figure 1] In the rear equipment 50, oxidation of the molded article MP is suppressed by exposing it to water, and the molded article MP is cooled. The rear equipment 50 comprises a first water tank 51 through which the molded product MP passes, a spray unit 53 that sprays water toward the rear end of the first water tank 51, and a second water tank 55 that stores the water to be supplied to the first water tank 51 and the water to be sprayed from the spray unit 53. An initial table 57 is also provided below the first water tank 51. By providing the first water tank 51, the spray unit 53, and the second water tank 55, the rear equipment 50 has a water-cooled environment.

[0023] The first water tank 51 is surrounded by appropriate members except for a product carry-in entrance 51A and a product discharge exit (not shown). Water stored in the second water tank 55 is supplied to the first water tank 51 during extrusion molding, and the molded product MP passes backward through the first water tank 51 while being immersed in water. Some of the water supplied to the first water tank 51 flows down from the product carry-in entrance 51A toward the second water tank 55.

[0024] The spray unit 53 includes a spray nozzle 53A that sprays water to form a water curtain WC from above the product carry-in entrance 51A, and a water supply passage 53B through which water is supplied to the spray nozzle 53A from a second water tank 55. Water stored in the second water tank 55 during extrusion molding is sprayed downward from the spray nozzle 53A by the power of a pump (not shown). The sprayed water forms a water curtain that separates the product carry-in entrance 51A from the outside.

[0025] Here, the oxidation of copper progresses faster as the temperature increases. Specifically, the oxidation rate becomes significant above 200°C. Therefore, it is necessary to quickly cool the molded product MP in the rear equipment 50, and for this purpose, the rear equipment 50 is provided with a first water tank 51 as a water-cooled environment.

[0026] In addition to the initial table 57, the rear equipment 50 is provided with a run-out table, for example, downstream of the initial table 57. The molded product MP is pulled by a puller (not shown) and transported while being supported by the initial table 57 and the run-out table. The molded product MP transported to the run-out table is then transferred to a stretcher table where distortion is removed and then transferred to a storage table.

[0027] [Extrusion molding operation: see Figures 2 and 3] Next, the operation of extrusion molding the molded product MP by the extrusion press device 1 will be described with reference to FIGS. In preparation for starting extrusion, a billet BL heated to a desired temperature is inserted into container 11, and the heating means of container 11 is generating heat to maintain the heating temperature. Furthermore, open / close valve 35 of gas supplier 30 is turned on, and nitrogen gas N is supplied from gas supply source 31 to gas chamber GR via gas supply path 33. Furthermore, water is supplied to fill first water tank 51 with water W, and a pump (not shown) is operated to draw water W from second water tank 55 via water supply path 53B and spray the water from spray nozzle 53A.

[0028] Once the above preparations for forming are complete, a drive source (not shown) is activated to advance the stem 13. As a result, the billet BL is pressed against the rear end surface of the die 17, and a portion of the front end surface of the billet BL corresponding to the die hole 17A passes through the die hole 17A to become a formed product MP. The formed product MP is transported through the initial table 57 to a run-out table (not shown).

[0029] During this molding and transport process, the molded product MP is surrounded by nitrogen gas N in the gas chamber GR, thereby suppressing oxidation of the molded product MP (first step). Furthermore, downstream of the gas chamber GR, the molded product MP passes through a first water tank 51, thereby cooling the molded product MP while suppressing oxidation of the molded product MP (second step). Moreover, molding elements such as the pressure ring 21 and end platen 23 surrounding the gas chamber GR are made of metal materials, especially ferrous metal materials such as tool steel that are easily corroded by water, but the molding elements come into contact with nitrogen gas N during molding, which is inert to ferrous metal materials. Therefore, corrosion of these molding elements is suppressed.

[0030] The supply of nitrogen gas N to the gas chamber GR, the supply of water W to the first water tank 51, and the formation of the water curtain WC by the injection nozzle 53A continue from the beginning of molding as shown in FIG. 2 until the end of molding as shown in FIG. 3.

[0031] When a subsequent extrusion molding is performed after a previous extrusion molding is completed using the extrusion press apparatus 1, no special work is required in the molding section 10. In other words, nitrogen gas N is supplied to the gas chamber GR during the previous extrusion molding, but it is not necessary to discharge the nitrogen gas N from the gas chamber GR before the subsequent extrusion molding begins. The nitrogen gas N supplied to the gas chamber GR is replaced with air during the interval between the previous and subsequent extrusion moldings, or even if nitrogen gas N remains in the gas chamber GR, there is no risk of it corroding the pressure ring 21 and the end platen 23. Therefore, in the extrusion press apparatus 1, supplying nitrogen gas N to the gas chamber GR does not require any additional work. This is also true in the second embodiment.

[0032] [Second embodiment: Figs. 4, 5, and 6] Next, an extrusion press apparatus 2 according to a second embodiment will be described. Note that the extrusion press apparatus 2 has elements in common with the extrusion press apparatus 1, and therefore the following description will focus on the differences from the extrusion press apparatus 1. In the extrusion press apparatus 2, elements in common with the extrusion press apparatus 1 are assigned the same reference numerals as those of the extrusion press apparatus 1 in Figs. 4 to 6.

[0033] 4, the extrusion press apparatus 2 is divided into a molding section 70 and a rear equipment 50 downstream of the molding section 70. The molding section 70 includes mechanical elements related to extrusion molding, similar to the molding section 10, and is supplied with nitrogen gas N, an inert gas, during molding.

[0034] The forming unit 70 includes a container 11, a stem 13, and a dummy block 15, with a closing block 12 provided between the container 11 and the stem 13. In the forming unit 70, the die 17 is disposed inside the container 11, and the dummy block 15 is disposed at the rear end inside the container 11. In addition, in the forming unit 70, the closing block 12 is provided between the container 11 and the stem 13, and the container 11 is pressed forward by the stem 13 via the closing block 12.

[0035] In the forming section 70, the die stem 18 is disposed between the die 17 and the end platen 23. The rear end of the die stem 18 contacts the front end of the die 17 inside the container 11, and the front end of the die stem 18 contacts the rear end of the end platen 23. The position of the die stem 18 is fixed by contact with the end platen 23.

[0036] In the forming section 70, when the stem 13 is pushed forward, the container 11 containing the billet BL is pushed forward via the closing block 12, and an extrusion pressure is applied to the billet BL toward the die 17. Since the forward movement of the die 17 is restricted, the billet BL passes through a die hole 17A formed in the die 17 and becomes a formed product MP having a cross-sectional shape that follows the shape of the die hole.

[0037] The forming section 70 of the extrusion press apparatus 2 includes a gas supplier 30, similar to the extrusion press apparatus 1 according to the first embodiment. However, the gas supply path 33 in the extrusion press apparatus 2 supplies nitrogen gas N to the gas chamber GR via the die stem 18, for example. The extrusion press 2 also includes a rear equipment 50 similar to that of the extrusion press 1. In the forming section 70, an inner cylinder 27 is disposed in the hollow portion of the pressure ring 21 and the end platen 23, and nitrogen gas N is also supplied to and filled inside this inner cylinder 27.

[0038] [Extrusion molding operation: see Figures 5 and 6] 5 and 6, the operation of extrusion molding of a molded product MP by the extrusion press device 2 will be described. It is assumed that the extrusion press device 2 is prepared for molding in the same manner as the extrusion press device 1.

[0039] When the stem 13 moves forward, the billet BL contained in the container 11 is pressed against the rear end surface of the die 17, whose movement is restricted by the die stem 18, and a portion of the front end surface of the billet BL corresponding to the die hole 17A passes through the die hole 17A to become a formed product MP. The formed product MP is transported through the initial table 57 to a run-out table (not shown).

[0040] During this molding and transport process, the molded product MP is surrounded by nitrogen gas in the gas chamber GR, which prevents oxidation of the molded product MP. Furthermore, downstream of the gas chamber GR, the molded product MP passes through the first water tank 51, which also prevents oxidation of the molded product MP. Furthermore, molding elements surrounding the gas chamber GR, such as the die stem 18, pressure ring 21, and end platen 23, come into contact with inert nitrogen gas during molding. Therefore, corrosion of these molding elements is prevented.

[0041] The supply of nitrogen gas to the gas chamber GR and the supply of water to the first water tank 51 are continued from the beginning of molding as shown in FIG. 5 until molding is completed as shown in FIG.

[0042] [Effects of Extrusion Press Devices 1 and 2] In the extrusion press devices 1 and 2, the molded product MP is exposed to a nitrogen gas atmosphere in the gas chamber GR from the time it is extruded from the die 17 until it reaches the rear equipment 50. This provides the following two effects.

[0043] [First effect: Corrosion suppression of extrusion elements] In the extrusion press devices 1 and 2, oxidation of the molded product MP is suppressed, and the inner surfaces of the die stem 18 (second embodiment), pressure ring 21, and end platen 23 that surround the outer periphery of the gas chamber GR can be prevented from being exposed to a corrosive environment. [Second effect: Ensuring cycle time] In the extrusion press devices 1 and 2, supplying nitrogen gas N to the gas chamber GR does not create any new work. Therefore, according to this embodiment, the interval between the preceding and succeeding extrusion moldings is not affected, and the cycle time of repeated extrusion moldings is not lengthened. Here, instead of nitrogen gas N, water can be supplied to the area corresponding to the gas chamber GR to suppress oxidation of the molded product MP. In this case, when the container 11 is moved away from the die 17 during cutting of the discard, which is the extrusion remainder of the billet BL, or when a new billet is inserted, the water in the gas chamber GR spills out of the die 17 (see Figures 2 and 3). This requires work to drain the water from the gas chamber GR during intervals, which could lengthen the cycle time. In comparison, this embodiment can shorten the cycle time.

[0044] [Selection of composition] In addition to the above, the configurations given in the above embodiments can be selected or changed as appropriate to other configurations without departing from the spirit of the present invention.

[0045] [Nitrogen gas N supply] In the extrusion press devices 1 and 2, nitrogen gas N is supplied to the gas chamber GR through a gas supply path 33 that reaches the front side of the pressure ring 21 supported by the end platen 23, but this is not limiting as long as nitrogen gas N can be supplied to the gas chamber GR. The supply position and supply system of nitrogen gas N are optional as follows. For example, in the extrusion press apparatuses 1 and 2, nitrogen gas N may be supplied to the gas chamber GR from a gas discharge hole provided on the rear side of the end platen 23. Also, in the extrusion press apparatus 2, a gas supply path 33 may be connected to the die stem 18, and nitrogen gas N may be supplied to the gas chamber GR from a gas discharge hole provided in the die stem 18. Furthermore, the gas supply path and the gas discharge holes connected thereto are not limited to one system, and nitrogen gas N can be supplied to the gas chamber GR from a plurality of gas supply systems. Furthermore, the nitrogen gas N supplied may be at room temperature, or may be cooled to a temperature lower than room temperature.

[0046] Although the first water tank 51 is used as an example of the water-cooling environment, there are no limitations on the water-cooling environment as long as the molded product can be water-cooled while suppressing oxidation. For example, the molded product can be water-cooled while suppressing oxidation by showering water onto the initial table 57. [Explanation of symbols]

[0047] 2 Extrusion press equipment 10 Molding section 11 Container 12 Closing Block 13 Stem 15 Dummy Block 17 Dice 18 Dice Stem 19 Baka 21 Pressuring 23 End platen 25 Outlet 27 Inner cylinder 30 Gas supply 31 Gas supply source 33 Gas supply line 35 On-off valve 50 Rear equipment 51 First Tank 53 Injection unit 53A Injection nozzle 53B Water supply channel 55 Second Tank 57 Initial Table 70 Molding section BL Billet MP molded product

Claims

1. a molding unit including at least a container for storing a molding material, a die for extruding the molding material forward while receiving a pressing force from behind, a pressure ring for receiving the pressing force from the die, and an end platen for holding the pressure ring; a rear equipment for performing post-processing on the molded product molded in the molding section; a gas supplier that supplies an inert gas to a gas chamber that is a hollow portion in the molding section where the pressure ring and the end platen communicate with each other; a water-cooled environment provided in the rear equipment into which the molded product is introduced; An extrusion press device comprising:

2. The molding portion is a stem that applies the pressing force to the workpiece in a forward direction; The extrusion press apparatus according to claim 1 .

3. The molding portion is forming the molded article by indirect extrusion; a die stem between the die and the pressure ring; The gas supplier includes: supplying the inert gas to the gas chamber, which is a hollow portion communicating with the die stem, the pressure ring, and the end platen; The extrusion press apparatus according to claim 1 .

4. the water-cooled environment is a water bath; a water jet nozzle for generating a water curtain that blocks the inlet of the molded product in the water tank behind the inlet; The extrusion press device according to any one of claims 1 to 3.

5. An extrusion press method for extruding a workpiece housed in a container forward through a die, comprising: a first step of transporting the molded product extruded from the die to a post-processing facility in an inert gas atmosphere where the molded product is subjected to post-processing; a second step of water-cooling the molded product in the rear equipment.

6. The workpiece is copper or a copper alloy, The extrusion pressing method according to claim 5 .

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