An extrusion press and an extrusion centering method

Abstract

The application discloses an extruding machine and an extruding centering method. The front plate of the extruding machine is provided with an adjustable die seat, and the extruding middle plate and the heat preservation seat are adjustably and slidably connected with the fixed beam. The die seat, the heat preservation seat and the extruding middle plate are connected through corresponding adjusting structures, so that the centering adjustment of the die, the extruding cylinder and the extruding rod component can be realized, thereby ensuring that the extrusion molding quality of products, the equipment performance and the service life of the die, the extruding cylinder and the extruding rod component can be kept at a high level. In the extruding centering method, the centering adjustment of the die, the extruding cylinder and the extruding rod component is carried out in steps under cold state and hot state, so that the thermal warping of each component and the mutual influence of factors can be avoided, thereby reducing the centering adjustment difficulty, and being favorable to the standardization of the centering process and the improvement of the centering efficiency.

Description

Technical Field

[0001] This invention relates to the field of aluminum profile forming and production technology, and in particular to an extrusion press and an extrusion centering method. Background Technology

[0002] An aluminum extrusion press is a device that applies external force to aluminum profiles placed in a container, causing them to flow out through specific die holes, thus forming the aluminum profile. With the widespread use of aluminum profiles in industry, aluminum profile extrusion has become an important industrial process.

[0003] In existing technologies, extruders achieve the extrusion molding of high-temperature aluminum rods by aligning the die cavity, extrusion cylinder, and extrusion rod in a straight line. Due to the high extrusion pressure and temperature, the accuracy of alignment significantly impacts the extrusion molding effect and the equipment's lifespan, directly affecting the extruder's performance, product quality, and the lifespan of the extrusion die, extrusion rod, and extrusion cylinder. Furthermore, achieving accurate alignment requires considering the deformation of each component (especially the extrusion rod) before and after heating, which is quite complex and cumbersome, significantly limiting extrusion molding quality and production efficiency. Therefore, precise inspection and adjustment of the alignment of the extrusion die, extrusion cylinder, and extrusion rod are crucial. Summary of the Invention

[0004] The purpose of this invention is to provide an extruder to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows: An extrusion press includes: a front plate, a rear plate, and a fixed beam disposed between and fixedly connected to the front and rear plates. A die holder is provided on the rear side of the front plate. A heat-insulating seat and an extrusion middle plate are provided between the front and rear plates. The heat-insulating seat and the extrusion middle plate are slidably disposed between the front and rear plates. The heat-insulating seat has an extrusion cylinder. The extrusion middle plate has an extrusion rod component including an extrusion rod body and an extrusion head. The front plate has an adjustable slide seat. The die holder is slidably connected to the slide seat from left to right. The front plate has a die-changing cylinder with a die-changing drive end slidably connected to the die holder for driving the die holder to move left and right. The fixed beam has an upper guide rail and a lower guide rail extending forward and backward. The upper and lower sides of the heat-insulating seat have adjustable upper connecting parts and lower connecting parts, which are slidably connected to the upper and lower guide rails, respectively. The extrusion middle plate is slidably connected to the fixed beam.

[0006] The extruder provided by this invention has at least the following beneficial effects: During the extrusion molding process, the heat-insulating seat presses forward against the mold on the die holder, and the extrusion plate is extruded forward under the action of the extrusion cylinder. The high-temperature aluminum rod is extruded forward and formed through the extrusion rod component inserted into the extrusion cylinder. The die-changing cylinder can press the die holder against the extrusion position. The die-changing drive end of the die-changing cylinder is adjustable to the die holder, and in conjunction with the relative position adjustment of the slide and the front plate, the absolute position of the die holder can be adjusted. By adjusting the relative position and orientation of the extrusion plate and the fixed beam, the absolute position of the extrusion rod component can be changed. The heat-insulating seat can be positioned relative to the die holder or the extrusion rod component through adjustable upper and lower connecting parts, thereby changing the absolute position of the extrusion cylinder. In the extruder of the present invention, the die holder, the heat preservation seat and the extrusion plate are adjusted through corresponding adjustment structures, which can realize the centering and adjustment of the die, the extrusion cylinder and the extrusion rod components, thereby ensuring that the extrusion molding quality of the product, the performance of the equipment and the service life of the die, the extrusion cylinder and the extrusion rod components can be maintained at a high level.

[0007] As a further improvement to the above technical solution, there are four fixed beams, evenly distributed at the four corners of the front and rear panels. The two upper fixed beams each have an upper guide rail, and the two lower fixed beams each have a lower guide rail. The upper left and right ends of the insulation base have upper connecting portions, and the lower left and right ends of the insulation base have lower connecting portions. Through this technical solution, the four fixed beams can form a stable and robust frame structure with the front and rear panels. The insulation base is adjustablely slidably connected to the upper and lower guide rails via the upper and lower connecting portions.

[0008] As a further improvement to the above technical solution, the upper connecting part is provided with an upper rail liner, which has a connecting inclined surface that connects to the upper guide rail. The upper rail liner is adjustablely connected to the insulation seat in the left-right direction. The lower connecting part is provided with a lower rail liner, which is slidably connected to the lower guide rail and adjustablely connected to the insulation seat in the up-down and left-right directions. Through the above technical solution, the insulation seat is connected to the upper and lower guide rails through the upper and lower rail liners. By adjusting the upper and lower rail liners, the posture of the insulation seat relative to the fixed beam can be adjusted, facilitating centering adjustment.

[0009] As a further improvement to the above technical solution, the front plate is provided with several locking cylinders, which are arranged rearward. Each locking cylinder has a piston rod that passes through the insulation base, and the piston rod is threaded with a front nut and a rear nut respectively located on the front and rear sides of the insulation base. Through the above technical solution, the insulation base can be driven forward by the locking cylinders to connect the extrusion cylinder and the mold. The insulation base can also be adjusted in the corresponding direction by tightening or loosening the front nut and the rear nut.

[0010] As a further improvement to the above technical solution, the front plate thread is provided with two adjusting bolts, both of which are upward-facing and positioned horizontally on the lower side of the slide block, abutting against the slide block. Through this technical solution, the two horizontally positioned adjusting bolts abut against the slide block, allowing for fine-tuning of the slide block's extension direction, thereby changing the extreme position of the mold base and achieving mold alignment and adjustment.

[0011] As a further improvement to the above technical solution, the mold changing drive end is provided with a connecting flange, the mold base is provided with a flange groove, the connecting flange is snapped into the flange groove and is provided with an adjusting screw that is threadedly connected to the mold base. Through the above technical solution, the tightness of the connection between the mold changing drive end and the mold base can be adjusted by the adjusting screw, thereby realizing the adjustment of the extreme positions of the mold base in the mold changing direction.

[0012] The present invention also provides an extrusion alignment method for the above-mentioned extrusion press, comprising the following steps: Step S1: Adjust the levelness of the extrusion rod component in a cold state; Step S2: Adjust the alignment of the die holder, extrusion cylinder, and extrusion rod components in a cold state; Step S3: Adjust the alignment of the extrusion cylinder and extrusion rod components while they are hot.

[0013] The extrusion alignment method provided by this invention has at least the following beneficial effects: performing alignment adjustments step by step in both cold and hot states can avoid the thermal warping of various components and the mutual influence of factors, thereby reducing the difficulty of alignment and debugging, and facilitating the standardization of the alignment process and the improvement of alignment efficiency.

[0014] As a further improvement to the above technical solution, step S2 specifically includes the following steps: Step S21: Coarsely adjust the level of the extrusion cylinder. When the extrusion rod component is close to the extrusion cylinder and the front end of the extrusion rod component is inserted into the extrusion cylinder, adjust the extrusion cylinder and the extrusion rod component to be aligned, but retain the gap for the heating deformation of the extrusion cylinder. Step S22: Push the extrusion cylinder forward against the mold base and adjust the alignment between the mold base and the extrusion cylinder.

[0015] As a further improvement to the above technical solution, step S22 specifically involves cleaning a ring-shaped, flat cover ring at the front end of the extrusion cylinder, installing a hollow mold on the mold base, and performing alignment adjustments based on the concentricity of the hollow mold and the cover ring when they are tightly sealed. This technical solution avoids aluminum adhesion to the front end face of the extrusion cylinder, which could affect the alignment adjustments with the mold.

[0016] As a further improvement to the above technical solution, in steps S1 and S2, the extrusion head of the extrusion rod component is removed and adjusted through the extrusion rod body; in step S3, the extrusion head is reinstalled. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a perspective view of an embodiment of the extruder provided by the present invention; Figure 2 This is a top view of an embodiment of the extruder provided by the present invention; Figure 3 This is a front view of an embodiment of the mold base structure for the front plate position provided by the present invention; Figure 4 yes Figure 3 Enlarged section view of region A in the middle; Figure 5 This is a schematic diagram of an embodiment of the heat preservation base provided by the present invention; Figure 6 This is a rear view of an embodiment of the middle plate device provided by the present invention; Figure 7 This is a schematic diagram of the gap in one embodiment of the extrusion rod component and extrusion cylinder provided by the present invention; Figure 8 This is a schematic diagram of an embodiment of the heat preservation base provided by the present invention.

[0018] In the diagram: 100, base frame device; 110, front plate; 111, slide block; 112, adjusting bolt; 120, rear plate; 121, main extrusion cylinder; 122, auxiliary extrusion cylinder; 130, fixed beam; 140, mold base; 150, mold changing cylinder; 151, film changing drive end; 200, pressure cylinder device; 210, heat preservation seat; 211, upper rail liner; 212, lower rail liner; 213, upper adjusting bolt; 214, longitudinal adjusting bolt; 215, transverse adjusting bolt; 220, extrusion cylinder; 300, middle plate device; 310, extrusion middle plate; 311, middle plate liner; 312, transverse adjusting bolt; 313, longitudinal adjusting bolt; 320, extrusion rod component. Detailed Implementation

[0019] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1 to 8 The extruder of the present invention is provided in the following embodiments: An extruder includes: a base frame assembly 100, a pressure cylinder assembly 200, and a middle plate assembly 300.

[0024] The base frame device 100 includes a front plate 110, a rear plate 120, and a fixing beam 130. The front plate 110 and the rear plate 120 are arranged one behind the other, and the fixing beam 130 is located between the front plate 110 and the rear plate 120. The front and rear ends of the fixing beam 130 are fixedly connected to the front plate 110 and the rear plate 120, respectively, to form a stable frame structure.

[0025] The pressure cylinder device 200 and the middle plate device 300 are both located between the front plate 110 and the rear plate 120. The pressure cylinder device 200 is located in front of the middle plate device 300. The pressure cylinder device 200 includes a heat insulation seat 210, and the middle plate device 300 includes a compression middle plate 310. Both the heat insulation seat 210 and the compression middle plate 310 are slidably connected to the fixed beam 130 in the front-rear direction.

[0026] The insulation base 210 is equipped with an extrusion cylinder 220. The extrusion plate 310 is equipped with an extrusion rod component 320, which includes an extrusion rod body and an extrusion head. The extrusion cylinder 220 is coaxially disposed at the front end of the extrusion rod body. The extrusion plate 310 is adjustablely slidably connected to the fixed beam 130.

[0027] The front plate 110 has a mold changing cylinder 150 and an adjustable slide block 111. The mold block 140 is slidably connected to the slide block 111. The mold changing cylinder 150 has a mold changing drive end that is adjustablely connected to the mold block 140 and drives the mold block 140 to move left and right relative to the slide block 111.

[0028] The fixed beam 130 has an upper guide rail and a lower guide rail that are arranged vertically and extend forward and backward. The upper side of the insulation base 210 has an adjustable upper connecting part, and the lower side of the insulation base 210 has an adjustable lower connecting part. The upper connecting part and the lower connecting part are respectively slidably connected to the upper guide rail and the lower guide rail in the forward and backward direction.

[0029] During the extrusion molding process, the heat-insulating seat 210 presses forward against the mold on the mold base 140, and the extrusion plate 310 is extruded forward by the extrusion cylinder. The high-temperature aluminum rod is extruded forward and shaped by the extrusion rod component 320 inserted into the extrusion cylinder 220. The mold changing cylinder 150 can press the mold base 140 against the extrusion position. The mold changing drive end of the mold changing cylinder 150 is adjustable to the mold base 140. With the adjustment of the relative position of the slide 111 and the front plate 110, the absolute position of the mold base 140 can be adjusted. By adjusting the relative position and posture of the extrusion plate 310 and the fixed beam 130, the absolute position of the extrusion rod component 320 can be changed. The heat-insulating seat 210 can be positioned relative to the mold base 140 or the extrusion rod component 320 through the adjustable upper and lower connecting parts, thereby changing the absolute position of the extrusion cylinder 220. The mold base 140, the heat preservation base 210, and the extrusion plate 310, through corresponding adjustment structures, can achieve the centering and adjustment of the mold, the extrusion cylinder 220, and the extrusion rod component 320, thereby ensuring that the extrusion molding quality of the product, the performance of the equipment, and the service life of the mold, the extrusion cylinder 220, and the extrusion rod component 320 can all be maintained at a high level.

[0030] Reference Figure 3 The front plate 110 is threaded with two adjusting bolts 112. Both adjusting bolts 112 are upward-facing and positioned horizontally on the lower side of the slide block 111, abutting against it. The two adjusting bolts 112 allow for fine-tuning of the mounting angle of the slide block 111 relative to the front plate 110, thereby adjusting the position of the mold base 140.

[0031] Reference Figure 4 In this embodiment, the mold changing drive end is provided with a connecting flange, the mold base 140 is provided with a flange groove, the connecting flange is snapped into the flange groove and is provided with an adjusting screw that is threadedly connected to the mold base 140. The connecting gap between the connecting flange and the flange groove can be adjusted by the adjusting screw, thereby adjusting the pressing position of the mold base 140 when it is pressed against by the mold changing cylinder 150.

[0032] In this embodiment, the fixed beam 130 is generally cylindrical in shape and extends axially in the front-to-back direction. To achieve a more uniform stress distribution structure, there are four fixed beams 130, preferably evenly and symmetrically distributed at the four corners between the front plate 110 and the rear plate 120. The four fixed beams 130 located at the four corners can form a cuboid frame structure with the front plate 110 and the rear plate 120, achieving uniform and symmetrical stress distribution in both the left-right and up-down directions.

[0033] Both of the two fixed beams 130 located on the upper side have upper guide rails, and both of the two fixed beams 130 located on the lower side have lower guide rails. The upper left and right ends of the insulation base 210 each have an upper connecting portion, which is slidably connected to the two upper guide rails. The lower left and right ends of the insulation base 210 each have a lower connecting portion, which is slidably connected to the two lower guide rails.

[0034] In this embodiment, the upper connecting part is provided with an upper rail liner 211, and the lower connecting part is provided with a lower rail liner 212.

[0035] The upper rail liner 211 is adjustablely connected to the insulation base 210 in the left-right direction. The upper rail liner 211 has an inclined connecting surface that slides smoothly with the upper guide rail. (Refer to...) Figure 5 The upper connecting part is provided with an upper adjusting bolt 213, which is threadedly connected to one of the insulation seat 210 and the upper rail liner 211 and abuts against the other. By rotating the upper adjusting bolt 213, the relative position of the upper rail liner 211 and the insulation seat 210 can be adjusted, thereby realizing the gap between the connecting inclined surface and the upper guide rail.

[0036] The lower rail liner 212 is disposed between the insulation base 210 and the fixed beam 130. The lower rail liner 212 is slidably connected to the lower guide rail in the front-to-back direction and is adjustablely connected to the insulation base 210 in the up-down and left-to-right directions. (Refer to...) Figure 5The lower rail liner 212 has a side plate located beside the lower guide rail. The lower connecting part is provided with a longitudinal adjusting bolt 214 and a transverse adjusting bolt 215. The longitudinal adjusting bolt 214 and the transverse adjusting bolt 215 are both threadedly connected to one of the insulation seat 210 and the lower rail liner 212 and abut against the other. The longitudinal adjusting bolt 214 is arranged in the vertical direction, and the transverse adjusting bolt 215 is arranged in the horizontal direction.

[0037] Furthermore, to ensure that the extrusion cylinder 220 can press forward against the mold end face during the extrusion molding process, the front plate 110 is provided with a mold-locking cylinder. In this embodiment, there are four mold-locking cylinders, which are evenly distributed around the circumference of the extrusion cylinder 220. The cylinder body of each mold-locking cylinder is fixedly connected to the front plate 110 and has a piston rod that passes through the insulation seat 210. The piston rod is threaded with a front nut and a rear nut. The front nut and the rear nut are respectively located on the front and rear sides of the insulation seat 210. During the extrusion molding process, the four mold-locking cylinders operate synchronously, pressing the insulation seat 210 forward, so that the cover ring at the front end of the extrusion cylinder 220 can press against the mold end face, thereby connecting the mold cavity and the extrusion cavity to achieve extrusion molding.

[0038] The rear plate 120 is provided with a main extrusion cylinder 121 and a secondary extrusion cylinder 122. The secondary extrusion cylinders 122 are arranged in pairs on the left and right sides of the main extrusion cylinder 121. Both the main extrusion cylinder 121 and the secondary extrusion cylinder 122 have an extrusion drive end that is pulsatorically connected to the extrusion plate 310 and causes the extrusion plate 310 to move back and forth relative to the rear plate 120.

[0039] In this embodiment, the main extrusion cylinder 121 is connected to the middle of the extrusion plate 310, and the two auxiliary extrusion cylinders 122 are respectively disposed on the left and right sides of the main extrusion cylinder 121 and connected to both sides of the extrusion plate 310. The left and right sides of the lower end of the extrusion plate 310 are respectively slidably connected to the two lower guide rails.

[0040] Reference Figure 6 The extrusion plate 310 has plate liners 311 on both the left and right sides of its lower end, and the plate liners 311 are located between the extrusion plate 310 and the lower guide rail. The plate liners 311 are slidably connected to the lower guide rail. The plate liners 311 are threaded with horizontal adjusting bolts 312 that are tightly connected to the extrusion plate 310, and the horizontal adjusting bolts 312 extend axially in the left-right direction. The extrusion plate 310 is threaded with longitudinal adjusting bolts 313 that are tightly connected to the plate liners 311, and the longitudinal adjusting bolts 313 extend axially in the up-down direction.

[0041] The present invention also provides an extrusion alignment method for the extruder, comprising the following steps: Step S1: Adjust the levelness of the extrusion rod component 320 in a cold state; Step S2: Adjust the alignment of the mold base 140, extrusion cylinder 220 and extrusion rod component 320 in the cold state; Step S3: Adjust the alignment of the extrusion cylinder 220 and the extrusion rod component 320 under hot conditions.

[0042] In step S1, specifically: First, the insulation seat 210 needs to be moved forward to the front limit position to provide space for the horizontal adjustment of the extrusion rod component 320.

[0043] Next, the extrusion rod is installed on the extrusion plate 310. Before installing the extrusion rod, the contact surface between the extrusion rod and the extrusion plate 310, as well as the surface of the extrusion rod, must be cleaned to remove any debris or foreign objects.

[0044] Then, place a level on the extrusion rod to confirm its levelness. The allowable error should be kept within 0.1mm / 1000mm.

[0045] If the level deviation of the extrusion rod is too large, check whether there is any debris or foreign matter on the contact surface between the extrusion rod and the extrusion plate 310. Then check whether the pressure plate bolts of the extrusion rod are all tightened. After completing the inspection, measure the level again. In particular, during the centering process of the extrusion rod, due to foundation reasons, the level cannot be based on the ground, but should be based on the lower guide rail.

[0046] Specifically, step S2 includes steps S21 and S22. Step S21: Coarsely adjust the level of the extrusion cylinder 220, then bring the extrusion rod member 320 close to the extrusion cylinder 220. When the front end of the extrusion rod member 320 is inserted into the extrusion cylinder 220, adjust the alignment of the extrusion cylinder 220 and the extrusion rod member 320, but maintain a gap for the heating deformation of the extrusion cylinder 220. Step S22: Push the extrusion cylinder 220 forward against the mold base 140, and adjust the alignment of the mold base 140 and the extrusion cylinder 220.

[0047] In step S21: First, it is necessary to confirm that there is no large amount of aluminum adhering to the end face of the extrusion cylinder 220 and the surface of the extrusion rod. If the aluminum adhering is serious, it is necessary to treat it or replace it with a new extrusion cylinder 220 and extrusion rod component 320. Before checking and adjusting the center, the extrusion cylinder 220 must also be cleaned.

[0048] Then, start the extruder. The main extrusion cylinder 121 drives the extrusion plate 310 forward, causing the extrusion rod to slowly approach the extrusion cylinder 220. When the extrusion rod inserts into the extrusion cylinder 220 (the front end of the extrusion rod inserts into the inlet guide arc of the extrusion cylinder 220), stop and turn off the power. Measure the upper, lower, left, and right clearance dimensions between the extrusion cylinder 220 and the extrusion rod using a feeler gauge. (Refer to...) Figure 7 The gap dimensions between the extrusion rod and the extrusion cylinder 220 at the top, bottom, left, and right sides are H1, H2, H3, and H4, respectively.

[0049] The extrusion cylinder 220 is adjusted so that |H3-H4| is less than or equal to 0.2mm and H1-H2=2mm (in this embodiment, a 1000T level extruder and an 800mm diameter extrusion cylinder 220 are used as examples. The allowable error is set to 0.2mm. Theoretically, the temperature of the extrusion cylinder 220 will rise by 2mm when it is heated to 420 to 450℃).

[0050] In step S22: Before aligning the extrusion cylinder 220 with the center of the mold, the main extrusion cylinder 121 drives the middle plate device 300 to retract to the retraction limit position, and the heat preservation seat 210 also retracts to the retraction limit position to make room for adjustment and check whether the front sealing surface of the extrusion cylinder 220 is stuck with aluminum. If the aluminum is stuck, it needs to be cleaned first.

[0051] After the aluminum adhesion inspection of the extrusion cylinder 220 is completed, a hollow mold is installed on the mold base 140 and moved to the extrusion position by the mold moving cylinder. Then, the mold locking cylinder drives the heat preservation seat 210 forward to press tightly, so that the sealing surface of the front end of the extrusion cylinder 220 is in close contact with the end face of the hollow mold.

[0052] At this point, the concentricity between the sealing surface of the extrusion cylinder 220 and the hollow mold is observed through the profile outlet. Based on this concentricity, the mold base 140 is finely adjusted to ensure that the mold, extrusion cylinder 220, and extrusion rod component 320 are aligned in the cold state.

[0053] Specifically, step S3 is as follows: First, move the insulation seat 210 back slightly so that the front nut of the mold-locking cylinder presses against the insulation seat 210, and then loosen the rear nut. Then, gradually heat the extrusion cylinder 220 to the range of 420 to 450°C.

[0054] The extrusion rod is brought close to the extrusion cylinder 220 again. It stops when the front end of the extrusion rod is inserted into the guide arc at the inlet of the extrusion cylinder 220, and the power is turned off. The values ​​of H1, H2, H3, and H4 are measured. The insulation seat 210 is adjusted according to the measured values ​​so that |H3-H4| and |H1-H2| are less than or equal to 0.2 mm.

[0055] Then, install the extrusion head and move the insulation seat 210 backward to the rear limit position. Slowly insert the extrusion rod component 320 back into the extrusion cylinder 220. During this process, carefully listen and observe whether the extrusion head is scraping against the inner wall of the extrusion cylinder 220. If scraping occurs, retract the extrusion rod component 320 and readjust the alignment. After the extrusion head extends out of the extrusion cylinder 220 (approximately 8mm), use a triangular feeler gauge to measure the gap values ​​H1, H2, H3, and H4 again, ensuring that |H3-H4| and |H1-H2| are both less than or equal to 0.2mm.

[0056] After alignment, apply molybdenum disulfide to the rear nut of the locking cylinder. After installation, push the insulation seat 210 back slightly to make the front nut press against the insulation seat 210, then tighten the rear nut. After tightening, measure the gap between the rear nut and the mounting end face of the insulation seat 210 using a feeler gauge; it should be between 0.2 and 0.4 mm. Molybdenum disulfide is an important solid lubricant, particularly suitable for high temperature and high pressure conditions. As a lubricant additive, it has a coefficient of friction between 0.05 and 0.09, and possesses advantages such as good dispersibility, non-stickiness, and anti-oxidation. It can be added to various greases to form a non-sticky colloidal state, thereby increasing the lubricity and extreme pressure properties of the grease, making it more suitable for applications in high temperature, high pressure, high speed, and high load environments.

[0057] Furthermore, referring to Figure 8 After completing the above alignment operation, check and confirm the values ​​of the gaps L1 and L2 between the upper rail liner 211 and the upper guide rail of the insulation seat 210, and the gaps L3 and L4 between the lower rail liner 212 and the side of the lower guide rail. The allowable error range is 0.2~0.4mm.

[0058] Specifically, first, the values ​​of L3 and L4 are measured and adjusted using the longitudinal adjusting bolt 214 and the transverse adjusting bolt 215, with an allowable error range of 0.2~0.4mm being preferred. Then, the values ​​of L1 and L2 are adjusted using the upper adjusting bolt 213, with an allowable error range of 0.3~0.4mm.

[0059] Then start the machine, retract the main extrusion cylinder 121 to the rear limit position, and then drive the heat preservation seat 210 to move back and forth two to three times. After that, stop the extrusion cylinder 220 at the front limit position, then insert the extrusion rod component 320 into the extrusion cylinder 220 and stop it, and turn off the power. Then check again whether the values ​​of L1, L2, L3 and L4 have changed.

[0060] Finally, tighten all the locking nuts of the longitudinal adjusting bolt 214, the transverse adjusting bolt 215, and the upper adjusting bolt 213.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art can make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the invention. All such changes, modifications, equivalent alterations or substitutions are included within the scope defined by the claims of this application, and the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for extrusion centering in an extrusion press, characterized in that: The extruder includes: a front plate, a rear plate, and a fixed beam disposed between the front plate and the rear plate and fixedly connected to the front plate and the rear plate. A mold base is provided on the rear side of the front plate. A heat insulation seat and an extrusion middle plate are provided between the front plate and the rear plate. The heat insulation seat and the extrusion middle plate are slidably disposed between the front plate and the rear plate. An extrusion cylinder is provided on the heat insulation seat. An extrusion middle plate is provided with an extrusion rod component including an extrusion rod body and an extrusion head. The front plate has an adjustable slide block, and the mold base is slidably connected to the slide block from left to right. The front plate is equipped with a mold changing cylinder, which has a mold changing drive end that is slidably connected to the mold base and used to drive the mold base to move left and right. The fixed beam has an upper guide rail and a lower guide rail that extend from front to back. The upper and lower sides of the heat preservation base have adjustable upper connecting parts and lower connecting parts, which are slidably connected to the upper guide rail and the lower guide rail, respectively. The extrusion plate is slidably connected to the fixed beam. The upper connecting part is provided with an upper rail liner, which has a connecting slope that connects to the upper guide rail. The upper rail liner is adjustablely connected to the insulation seat in the left-right direction. The lower connecting part is provided with a lower rail liner, which is slidably connected to the lower guide rail and adjustablely connected to the insulation seat in the up-down and left-right directions. The front plate is threaded with two adjusting bolts, both of which are facing upwards and are positioned horizontally on the lower side of the slide block, abutting against the slide block. The mold changing drive end is provided with a connecting flange, the mold base is provided with a flange groove, the connecting flange is snapped into the flange groove and is provided with an adjusting screw that is threadedly connected to the mold base; The extrusion centering method includes the following steps: Step S1: Adjust the levelness of the extrusion rod component in a cold state; Step S2: Adjust the alignment of the die holder, extrusion cylinder, and extrusion rod components in a cold state; specifically, this includes: Step S21: Coarsely adjust the level of the extrusion cylinder. When the extrusion rod component is close to the extrusion cylinder and the front end of the extrusion rod component is inserted into the extrusion cylinder, adjust the extrusion cylinder and the extrusion rod component to be aligned, but retain the gap for the heating deformation of the extrusion cylinder. Step S22: Press the extrusion cylinder forward against the mold base and adjust the alignment between the mold base and the extrusion cylinder; clean out an annular and flat cover ring at the front end of the extrusion cylinder; install a hollow mold on the mold base; and adjust the alignment by checking the concentricity of the hollow mold and the cover ring when they are pressed together for sealing. Step S3: Adjust the alignment of the extrusion cylinder and extrusion rod components while they are hot.

2. The extrusion centering method according to claim 1, characterized in that: The number of fixed beams is four, and the four fixed beams are evenly distributed at the four corners of the front plate and the rear plate; the two fixed beams on the upper side are each equipped with an upper guide rail, and the two fixed beams on the lower side are each equipped with a lower guide rail. The upper left and right ends of the upper side of the insulation seat are equipped with an upper connecting part, and the lower left and right ends of the lower side of the insulation seat are equipped with a lower connecting part.

3. The extrusion centering method according to claim 1, characterized in that: The front plate is provided with a number of locking cylinders, which are arranged rearward. Each locking cylinder has a piston rod that passes through the insulation base. The piston rod is threaded with a front nut and a rear nut respectively located on the front and rear sides of the insulation base.

4. The extrusion centering method according to claim 1, characterized in that: In steps S1 and S2, the extrusion head of the extrusion rod component is removed and adjusted using the extrusion rod body; in step S3, the extrusion head is reinstalled.

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