Extrusion press device and method for monitoring temperature of fixed dummy block of extrusion press device

Abstract

To suppress execution of extrusion operation in a state where a diameter of a tip of a fixed dummy block is not sufficiently enlarged when pressing a billet.SOLUTION: In a method for monitoring a temperature of a fixed dummy block of an extrusion press device in which a position of a fixed dummy block 3a at the time when a main ram 4a is at a backward limit position is set as a temperature-monitoring position and in which non-contact type temperature measuring means 23 is arranged so that a temperature of the fixed dummy block 3a at the temperature-monitoring position can be measured, the non-contact type temperature measuring means 23 measures and monitors the temperature of the fixed dummy block 3a when the fixed dummy block 3a is at the temperature-monitoring position, and an alarm for temperature decrease is issued when performing an extrusion operation in a state where the temperature is lower than a preliminarily set lower-limit temperature of the fixed dummy block.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an extrusion press apparatus and a method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus. [Background technology]

[0002] An extrusion press is a device that manufactures aluminum products by pressing an easily processable metal material, such as aluminum or its alloy (hereinafter referred to as aluminum material), against a die and continuously extruding (extrusion molding) aluminum products of a predetermined cross-sectional shape from the die. The die has an opening that mimics the cross-sectional shape of the aluminum product, and the extruded long aluminum product is cut to the specified length to become individual aluminum products.

[0003] A conventional extrusion press and its extrusion process will be described with reference to Figure 1. Figure 1 is a schematic cross-sectional side view showing an outline of the configuration of an extrusion press, with detailed configuration illustrations omitted. The aluminum material to be extruded is formed into a cylindrical billet B with a predetermined diameter corresponding to the aluminum product W to be manufactured, and is inserted into a billet storage section in a container 1. This billet storage section is made up of a container liner (not shown) inserted into the container 1 body and separate from the container 1 body.

[0004] The main cylinder 4, which generates extrusion pressure, is a hydraulic cylinder with only an oil chamber for advancing the cylinder rod, and the main ram 4a corresponds to the cylinder rod. The extrusion stem 3 is attached to the main ram 4a via a main crosshead (not shown). A fixed dummy block (not shown) is attached to the tip of the extrusion stem 3. When the main ram 4a (ram position) moves toward the die 2 (forward / right side in Figure 1) due to hydraulic oil supplied from the main pump unit 5 to the oil chamber of the main cylinder 4 via a hydraulic circuit, the extrusion stem 3 also moves (forward), pressing the billet B against the die 2. This pressure pressurizes the billet B within the container 1 and continuously extrudes it through the opening of the die 2, which resembles the cross-sectional shape of the aluminum product W. Reference numeral 10 denotes an end platen, and 10a denotes a pressure ring embedded in the end platen 10 that receives the pressing force acting on the die 2. For simplicity's sake, the main pump unit 5 is illustrated as a hydraulic pump in Figure 1.

[0005] Regarding temperature monitoring of the fixed dummy block, Patent Document 1 discloses a cooling device for the fixed dummy block. This solves the problem that when the temperature of the extrusion surface of the fixed dummy block rises due to heat received from the aluminum alloy billet during billet extrusion, impurities and residual air contained in the billet skin are drawn in backward by metal flow and flow into the extrusion die, resulting in blisters and impurities being drawn in during extrusion molding, reducing the product yield of the extruded material. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 07-204732 Summary of the Invention [Problem to be solved by the invention]

[0007] On the other hand, the fixed dummy block is configured so that when the billet is pressed, the outer diameter of the billet pressing portion of the fixed dummy block expands radially due to the reaction force, and the billet pressing portion of the fixed dummy block comes into close contact with the inner peripheral surface of the container. An example of a fixed dummy block is shown in Figure 2. When the core block 31 is compressed due to the reaction force when the billet is pressed, the tapered surface formed on the outer periphery of the core block 31 causes the outer ring 32 to expand radially. This radial expansion of the outer ring 32 brings the outer peripheral surface of the outer ring 32 into close contact with the inner peripheral surface of the container (the inner peripheral surface of the container liner), preventing the billet from leaking from the fixed dummy block toward the extrusion stem.

[0008] However, if the temperature of the fixed dummy block is lower than a predetermined temperature, the diameter of the tip of the fixed dummy block may not be sufficiently expanded when pressing the billet. If the extrusion process is started in such a state where the diameter of the tip of the fixed dummy block is not sufficiently expanded, the billet may flow back toward the extrusion stem through the gap between the inner surface of the container (the inner surface of the container liner) and the outer surface of the fixed dummy block, which may cause clogging, improper billet insertion, or the container being pulled by the extrusion stem.

[0009] The present invention has been made in consideration of the above-mentioned problems, and has as its object to provide an extrusion press apparatus and a method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus, which measures and monitors the temperature of a fixed dummy block, and issues a temperature drop alarm if an extrusion operation is attempted when the temperature of the fixed dummy block is lower than a preset lower limit temperature of the fixed dummy block. [Means for solving the problem]

[0010] The object of the present invention is to provide an extrusion press device in which a fixed dummy block is disposed at the tip of an extrusion stem disposed on the front end surface of a main crosshead connected to a main ram, This is achieved by an extrusion press device characterized in that the position of the fixed dummy block when the main ram is at its most retracted position is set as a temperature monitoring position, and a non-contact temperature measuring means is arranged so that the temperature of the fixed dummy block at the temperature monitoring position can be measured.

[0011] Another object of the present invention is to provide a method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus in which a fixed dummy block is disposed at the tip of an extrusion stem disposed at the front end surface of a main crosshead connected to a main ram, the method comprising: the position of the fixed dummy block when the main ram is at its most retracted position is set as a temperature monitoring position, and non-contact temperature measuring means is arranged so as to be able to measure the temperature of the fixed dummy block at the temperature monitoring position, This is achieved by a method for monitoring the temperature of a fixed dummy block of an extrusion press device, characterized in that when the fixed dummy block is in the temperature monitoring position, the temperature of the fixed dummy block is measured and monitored by the non-contact temperature measuring means, and if an extrusion operation is attempted when the temperature of the fixed dummy block is lower than a preset lower limit temperature of the fixed dummy block, a temperature drop alarm is issued.

[0012] In the method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus according to the present invention, the extrusion operation is in an automatic operation mode, and in this automatic operation mode, the temperature of the fixed dummy block is measured and monitored by the non-contact temperature measuring means twice, once when the automatic operation is started and once when the insertion of the billet into the container is completed, and it is preferable that the temperature drop alarm is issued if the temperature of the fixed dummy block is lower than the fixed dummy block lower limit temperature at least once.

[0013] Furthermore, in the method for monitoring the temperature of a fixed dummy block of an extrusion press device according to the present invention, the extrusion operation may be in a manual operation mode, and in the manual operation mode, if the fixed dummy block remains in a position other than the temperature monitoring position and not inserted into a container for a period exceeding a preset non-monitoring time, a re-temperature monitoring alarm may be issued to prompt temperature monitoring of the fixed dummy block.

[0014] Furthermore, in the method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus according to the present invention, the extrusion operation may be in an automatic operation mode, and in the automatic operation mode, if the temperature of the fixed dummy block drops below the fixed dummy block lower limit temperature, or if the fixed dummy block remains in a position other than the temperature monitoring position and not inserted into the container for longer than the non-monitoring time, the method may include an automatic heat-retention cycle function that advances the main ram to insert the fixed dummy block into the container and keeps the fixed dummy block warm in the container for a preset heat-retention time. [Effects of the Invention]

[0015] The extrusion press device according to the present invention is an extrusion press device in which a fixed dummy block is disposed at the tip of an extrusion stem that is disposed at the front end surface of a main crosshead connected to a main ram, The position of the fixed dummy block when the main ram is at its rearmost position is set as the temperature monitoring position, and a non-contact temperature measuring means is arranged so that the temperature of the fixed dummy block at the temperature monitoring position can be measured. Therefore, this is suitable for implementing the method for monitoring the temperature of a fixed dummy block in an extrusion press apparatus according to the present invention.

[0016] The method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus according to the present invention is a method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus in which a fixed dummy block is disposed at the tip of an extrusion stem that is disposed at the front end surface of a main crosshead connected to a main ram, and includes the steps of: the position of the fixed dummy block when the main ram is at its most retracted position is set as a temperature monitoring position, and non-contact temperature measuring means is arranged so as to be able to measure the temperature of the fixed dummy block at the temperature monitoring position, When the fixed dummy block is in the temperature monitoring position, the temperature of the fixed dummy block is measured and monitored by the non-contact temperature measuring means, and if an extrusion operation is attempted when the temperature of the fixed dummy block is lower than the preset lower limit temperature of the fixed dummy block, a temperature drop alarm is issued.This prevents the execution of an extrusion operation when the temperature of the fixed dummy block is lower than the preset lower limit temperature of the fixed dummy block, and prevents the billet from flowing back toward the extrusion stem through the gap between the inner surface of the container (inner surface of the container liner) and the outer surface of the fixed dummy block, thereby suppressing jamming, improper billet insertion, and container pulling by the extrusion stem. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic cross-sectional side view showing an outline of the configuration of an extrusion press device. [Figure 2] FIG. 10 is a cross-sectional view showing an example of a fixed dummy block. [Figure 3] FIG. 10 is a diagram illustrating the temperature monitoring position of a fixed dummy block. [Figure 4] 3A and 3B are side views illustrating a method for monitoring the temperature of a fixed dummy block according to the first embodiment. [Figure 5] 10 is a side view illustrating an automatic heat retention cycle of the temperature monitoring method for a fixed dummy block according to the second embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0019] [First embodiment] An extrusion press apparatus and a method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus according to a first embodiment will be described with reference to FIGS. 3 and 4. First, the extrusion press apparatus according to the first embodiment will be described with reference to FIG. 3. FIG. 3 is a diagram illustrating the temperature monitoring position of the fixed dummy block. As shown in FIG. 3(a), an extrusion stem 3 having a fixed dummy block 3a at its tip is disposed on the front end surface of a main crosshead 21 via an extrusion stem moving mechanism 22. The extrusion press apparatus shown in FIG. 3 is a rear-loading short-stroke extrusion press apparatus. In a rear-loading short-stroke extrusion press apparatus, when inserting a billet B into a container 1, the extrusion stem 3 is moved (upward in this case) from the extrusion center by the extrusion stem moving mechanism 22, and the billet B is supplied to the extrusion center of the space formed between the container 1 and the main crosshead 21 by a billet conveying device. Then, the billet B is inserted into the container 1 by a billet insertion mechanism disposed in the billet supplying device.

[0020] FIG. 3(a) shows a state in which the main ram (not shown) connected to the main crosshead 21 is at its rearmost position and the extrusion stem 3 is at the center of extrusion. When the automatic operation start operation is performed in this state, the billet begins to be inserted into the container 1. The position of the fixed dummy block 3a in this state is designated the temperature monitoring position. A non-contact temperature measuring device 23 is disposed on the tie rod 24 so that the temperature of the fixed dummy block 3a at this temperature monitoring position can be measured. FIG. 3(b) shows the positional relationship between the non-contact temperature measuring device 23 and the fixed dummy block 3a. FIG. 3(b) is a view taken along the arrow AA in FIG. 3(a). The extrusion press device configured in this manner can measure and monitor the temperature of the fixed dummy block 3a at the temperature monitoring position. The non-contact temperature measuring device 23 may be a known non-contact temperature sensor or the like, as long as it can measure the temperature of the fixed dummy block 3a at the temperature monitoring position.

[0021] Next, a method for monitoring the temperature of the fixed dummy block of the extrusion press apparatus according to the first embodiment will be described with reference to FIG. 4. In the automatic operation mode, the temperature of the fixed dummy block is measured and monitored by a non-contact temperature measuring device twice: when the automatic operation is started and when the billet B is completely inserted into the container 1. If the temperature of the fixed dummy block is lower than the fixed dummy block lower limit temperature at least once, a temperature drop alarm is issued to notify the operator of the extrusion press apparatus. The non-contact temperature measuring device 23 and the tie rods 24 are not shown in FIG. 4. The fixed dummy block lower limit temperature may be set in the control device of the extrusion press apparatus to a temperature at which the fixed dummy block 3a can be sufficiently expanded during the extrusion operation.

[0022] Specifically, first, as shown in Fig. 4(a), after the automatic operation start operation has been performed, when the fixed dummy block 3a is in the temperature monitoring position, the non-contact temperature measuring means 23 performs a first temperature measurement of the fixed dummy block 3a. Then, to start billet supply, as shown in Fig. 4(b), the extrusion stem 3 is moved upward by the extrusion stem moving mechanism 22, and the billet supply device with the billet B placed on it is inserted to the extrusion center between the container 1 and the main crosshead 21. Then, the billet B is inserted into the container 1 by the billet insertion mechanism 25 arranged in the billet B placement section of the billet supply device.

[0023] Next, as shown in FIG. 4(c), the billet supply device is retracted from the extrusion center, and as shown in FIG. 4(d), the extrusion stem 3 is returned to the extrusion center by the extrusion stem moving mechanism 22. At this timing, the non-contact temperature measurement means 23 performs a second temperature measurement of the fixed dummy block 3a. If the temperature of the fixed dummy block 3a is lower than the fixed dummy block lower limit temperature in at least one of the two temperature measurements, a temperature drop alarm is issued to notify the operator of the extrusion press. At this time, after issuing the alarm, the automatic operation mode may be canceled and the operation of the extrusion press may be stopped.

[0024] Next, even in the manual operation mode, when an extrusion operation is attempted and the fixed dummy block 3a is in the temperature monitoring position, the temperature of the fixed dummy block 3a is measured and monitored by the non-contact temperature measuring means 23, and if the temperature of the fixed dummy block 3a is lower than the fixed dummy block lower limit temperature, a temperature drop alarm is issued to notify the operator of the extrusion press. Here, unlike the automatic operation mode, in the manual operation mode, the operator does not know the relative positions of the various devices of the extrusion press or how much time has passed, and furthermore, the temperature of the fixed dummy block 3a cannot be ascertained except at the temperature monitoring position.

[0025] Therefore, in the manual operation mode, if an extrusion operation is attempted and the fixed dummy block 3a is not in the temperature monitoring position and is not inserted into the container 1 for a period exceeding a preset non-monitoring time, a re-temperature monitoring alarm is issued to prompt the operator to monitor the temperature of the fixed dummy block 3a. This re-temperature monitoring alarm prompts the operator not to manually perform the extrusion operation when the temperature of the fixed dummy block 3a is lower than the fixed dummy block lower limit temperature. Note that the state in which the fixed dummy block 3a is inserted into the container 1 is excluded because the container 1 has a built-in heating means for heating and keeping the stored billet B warm, and a temperature drop of the fixed dummy block 3a can be suppressed while the fixed dummy block 3a is inserted into the container 1. The non-monitoring time may be set in the control device of the extrusion press as an appropriate time, taking into account the temperature drop of the fixed dummy block 3a under the above-described conditions.

[0026] As explained above, in the automatic operation mode or the manual operation mode, by measuring and monitoring the temperature of the fixed dummy block 3a located at the temperature monitoring position with the non-contact temperature measuring means 23, a temperature drop alarm can be issued to urge the operator not to perform the extrusion operation when the temperature of the fixed dummy block 3a is lower than the fixed dummy block lower limit temperature. This prevents the execution of the extrusion operation when the temperature of the fixed dummy block is lower than the preset fixed dummy block lower limit temperature, and prevents the billet from flowing back toward the extrusion stem through the gap between the inner peripheral surface of the container (inner peripheral surface of the container liner) and the outer peripheral surface of the fixed dummy block, thereby suppressing the occurrence of jamming, improper billet insertion, and container pulling by the extrusion stem.

[0027] Furthermore, in the manual operation mode, a temperature monitoring alarm is issued to prompt the operator to monitor the temperature of the fixed dummy block 3a, and the operator can be prompted not to manually perform the extrusion operation when the temperature of the fixed dummy block 3a is lower than the fixed dummy block lower limit temperature. This prevents the execution of the extrusion operation when the temperature of the fixed dummy block is lower than the preset fixed dummy block lower limit temperature, prevents the billet from flowing back toward the extrusion stem through the gap between the inner peripheral surface of the container (inner peripheral surface of the container liner) and the outer peripheral surface of the fixed dummy block, and suppresses the occurrence of jamming, improper billet insertion, and container pulling by the extrusion stem.

[0028] [Second embodiment] A method for monitoring the temperature of a fixed dummy block of an extrusion press apparatus according to a second embodiment will be described with reference to Fig. 5. The second embodiment is characterized by the inclusion of an automatic heat-retention cycle function that, in automatic operation mode, inserts a fixed dummy block 3a into a container 1 and keeps the fixed dummy block 3a warm in the container 1 for a preset heat-retention time. Since the rest of the method is the same as the first embodiment, only the automatic heat-retention cycle function will be described.

[0029] In the automatic operation mode, if the temperature of the fixed dummy block 3a drops below the fixed dummy block lower limit temperature, or if the fixed dummy block 3a remains in a position other than the temperature monitoring position and not inserted into the container 1 for a predetermined non-monitoring time, the main ram is advanced to insert the fixed dummy block 3a into the container 1 and keep the fixed dummy block 3a warm in the container 1 for a predetermined warm-keeping time. Figure 5 shows the extrusion press device during the automatic warm-keeping cycle function. In the automatic warm-keeping cycle function, after the predetermined warm-keeping time has elapsed, the fixed dummy block 3a and other components can be returned to their original positions by performing a reset operation on the control panel of the extrusion press device, and the automatic operation mode can be resumed.

[0030] By providing this automatic heat retention cycle function, it is possible to avoid performing extrusion operations when the temperature of the fixed dummy block 3a is lower than the fixed dummy block lower limit temperature, and it is also possible to suppress the issuance of a temperature drop alarm in automatic operation mode, thereby shortening the operator's working time when a temperature drop alarm is issued. Note that this automatic heat retention cycle function does not operate when a billet is inserted in the container 1.

[0031] The first and second embodiments have been described above as forms for implementing the invention, but it goes without saying that the present invention is not limited to the above embodiments and can be implemented in various forms without departing from the scope of the claims.

[0032] In the first embodiment, in the automatic operation mode, the temperature of the fixed dummy block is measured and monitored by a non-contact temperature measuring means twice: when the automatic operation is started and when the billet B is completely inserted into the container 1; however, it is also possible to measure and monitor only once.

[0033] Furthermore, the temperature of the fixed dummy block 3a measured at the temperature monitoring position may be used to monitor the detachment of the fixed dummy block 3a. Specifically, if the fixed dummy block 3a falls off from the tip of the extrusion stem 3 for some reason, the non-contact temperature measuring means 23 will measure the temperature of the space where the fixed dummy block 3a is not present, and the measured temperature will be clearly different from the temperature when the fixed dummy block 3a is not detached. Utilizing this, a fixed dummy block detachment temperature may be set in advance, and the detachment of the fixed dummy block 3a may be determined by comparing the temperature measured at the temperature monitoring position.

[0034] Furthermore, in the first embodiment, the non-contact temperature measuring means 23 is arranged on the tie rod 24, but it may be arranged somewhere other than the tie rod 24 as long as it is possible to measure the temperature of the fixed dummy block 3a at the temperature monitoring position. [Explanation of symbols]

[0035] 1 container, 2 die, 3 extrusion stem, 3a fixed dummy block, 4 main cylinder, 4a main ram, 5 main pump unit, 10 end platen, 10a pressure ring, 21 main crosshead, 22 extrusion stem moving mechanism, 23 non-contact temperature measuring means, 24 tie rod, 25 billet insertion mechanism, 31 core block, 32 outer ring, B Billet, W Aluminum products,

Claims

1. A method for monitoring the temperature of a fixed dummy block of an extrusion press device in which a fixed dummy block is disposed at the tip of an extrusion stem that is disposed at the front end face of a main crosshead connected to a main ram, comprising: the position of the fixed dummy block when the main ram is at its most retracted position is set as a temperature monitoring position, and non-contact temperature measuring means is arranged so as to be able to measure the temperature of the fixed dummy block at the temperature monitoring position, a temperature monitoring method for a fixed dummy block of an extrusion press apparatus, the temperature of the fixed dummy block being measured and monitored by the non-contact temperature measuring means when the fixed dummy block is in the temperature monitoring position, and a temperature drop alarm being issued when an extrusion operation is attempted in a state in which the temperature of the fixed dummy block is lower than a preset lower limit temperature of the fixed dummy block; a temperature monitoring method for a fixed dummy block of an extrusion press device, characterized in that the extrusion operation is in an automatic operation mode, and in the automatic operation mode, the temperature of the fixed dummy block is measured and monitored by the non-contact temperature measuring means twice, once when the automatic operation is started and once when the billet is completely inserted into the container, and the temperature drop alarm is issued if the temperature of the fixed dummy block is lower than the fixed dummy block lower limit temperature at least once.

2. A method for monitoring the temperature of a fixed dummy block of an extrusion press device in which a fixed dummy block is disposed at the tip of an extrusion stem disposed at the front end face of a main crosshead connected to a main ram, comprising: the position of the fixed dummy block when the main ram is at its most retracted position is set as a temperature monitoring position, and non-contact temperature measuring means is arranged so as to be able to measure the temperature of the fixed dummy block at the temperature monitoring position, a temperature monitoring method for a fixed dummy block of an extrusion press apparatus, the temperature of the fixed dummy block being measured and monitored by the non-contact temperature measuring means when the fixed dummy block is in the temperature monitoring position, and a temperature drop alarm being issued when an extrusion operation is attempted in a state in which the temperature of the fixed dummy block is lower than a preset lower limit temperature of the fixed dummy block; a temperature monitoring method for a fixed dummy block of an extrusion press device, characterized in that the extrusion operation is in a manual operation mode, and in the manual operation mode, if the fixed dummy block remains in a position other than the temperature monitoring position and not inserted into the container for a period exceeding a preset non-monitoring time, a re-temperature monitoring alarm is issued to prompt temperature monitoring of the fixed dummy block.

3. A method for monitoring the temperature of a fixed dummy block of an extrusion press device in which a fixed dummy block is disposed at the tip of an extrusion stem disposed at the front end face of a main crosshead connected to a main ram, comprising: the position of the fixed dummy block when the main ram is at its most retracted position is set as a temperature monitoring position, and non-contact temperature measuring means is arranged so as to be able to measure the temperature of the fixed dummy block at the temperature monitoring position, a temperature monitoring method for a fixed dummy block of an extrusion press apparatus, the temperature of the fixed dummy block being measured and monitored by the non-contact temperature measuring means when the fixed dummy block is in the temperature monitoring position, and a temperature drop alarm being issued when an extrusion operation is attempted in a state in which the temperature of the fixed dummy block is lower than a preset lower limit temperature of the fixed dummy block; a temperature monitoring method for a fixed dummy block of an extrusion press device, the method comprising: an automatic heat-retention cycle function for, when the extrusion operation is in an automatic operation mode, if the temperature of the fixed dummy block drops below the lower limit temperature of the fixed dummy block, or if the fix dummy block remains in a position other than the temperature monitoring position and not inserted into the container for a predetermined non-monitoring time, advancing the main ram to insert the fix dummy block into the container and keeping the fix dummy block warm in the container for a predetermined heat-retention time.

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