Extrusion device for extrusion forming

Abstract

The utility model belongs to the technical field of extrusion forming, and particularly relates to an extrusion device for extrusion forming. The extrusion device comprises a die holder, a die core, a pressing cylinder and an extrusion piece. The die holder is used for supporting the extrusion device, and a fixing groove is formed in the top of the die holder; the mold core is used for changing the shape of a sample to be processed, and the mold core is placed in the fixing groove of the mold base; the pressing cylinder is fixed to the fixed top of the die holder through a fastener, a first through hole is formed in the center of the pressing cylinder in the vertical direction, and a sample to be machined is placed in the first through hole. And the extrusion piece is inserted into the first through hole in a sliding manner and is used for extruding a to-be-processed sample in the first through hole. According to the extrusion device, a special extrusion machine for extrusion forming is not needed, and the to-be-processed sample can be subjected to extrusion forming only by putting the extrusion device on a common oil press or press. Therefore, the extrusion device has good use flexibility and is lower in cost compared with a special extruder.

Description

Technical Field

[0001] The utility model belongs to the technical field of extrusion molding, and particularly relates to an extrusion device for extrusion molding. Background Art

[0002] Extrusion molding is one of the important processes in product production. It improves the organizational structure and mechanical properties by extruding and deforming the material at high temperature. After high-temperature extrusion deformation, the internal organizational structure of the metal is broken and deformed, and defects such as pores, shrinkage holes, and cracks are compressed to improve the density. Traditional extrusion molding production is suitable for large-scale normal production, but not for small and medium-scale sample tests in R&D institutions and universities.

[0003] When the test product input is small, the special extruder cannot complete the extrusion work due to the reduction of ingot casting. Even after the extrusion operation is barely completed, the extrusion residual material accounts for a large proportion, and the sample yield rate is less than 50%, which cannot meet the subsequent experimental requirements. At the same time, for the extrusion process of samples of different sizes, due to the complexity of replacing the mold of the traditional extruder, it is often impossible to test the same batch.

[0004] The above problems are all practical difficulties faced by product extrusion molding in the actual production and test stages. For example, patent publication number CN202321940987.6 discloses a small and medium-sized extruder extrusion device, including an inner sleeve, an extrusion screw, and an extrusion die. The device is designed and equipped with a corresponding type of die by modifying a special extruder. It is not only expensive, but also requires physical space and supporting facilities such as water, electricity, and gas, which is time-consuming, labor-intensive, and costly. In addition, research institutions and universities that lack special extruders cannot use the extrusion equipment for experimental production. Summary of the invention

[0005] In order to solve the problem in the prior art that some research institutions and universities lack dedicated extruders and devices for small batches of samples to be extruded, the utility model provides an extrusion device for extrusion molding. The extrusion device does not need to use an extruder dedicated to extrusion molding, and can be extruded and molded on the samples to be processed by simply placing it on a common hydraulic press or press. Therefore, the extrusion device has good flexibility in use and is lower in cost than a dedicated extruder.

[0006] To achieve the above purpose, the technical solution adopted is:

[0007] An extrusion device for extrusion molding, characterized in that it comprises:

[0008] A die base, which is used to support the extrusion device, and a fixing groove is provided on the top of the die base;

[0009] A mold core, which is used to change the shape of the sample to be processed, and the mold core is placed in a fixed groove of the mold base;

[0010] A pressing cylinder, which is fixed to the top of the die base by a fastener, and a first through hole is opened in the center of the pressing cylinder along the vertical direction, and the sample to be processed is placed in the first through hole;

[0011] and an extrusion piece, which is slidably inserted in the first through hole, and is used for extruding the sample to be processed in the first through hole.

[0012] According to the extrusion device for extrusion molding of the utility model, further, the die base is cylindrical, a mounting slot is provided in the middle and lower part of the die base, a first flange is circumferentially provided on the top of the die base, and a plurality of first connecting holes are provided on the first flange.

[0013] According to the extrusion device for extrusion molding of the utility model, further, a second through hole is opened at the center of the fixing groove.

[0014] According to the extrusion device for extrusion molding of the utility model, further, an extrusion hole communicating with the second through hole is opened at the center of the mold core.

[0015] According to the extrusion device for extrusion molding of the utility model, further, the pressing cylinder is cylindrical, a second flange is circumferentially arranged at the bottom of the pressing cylinder, and a plurality of second connecting holes corresponding to the position and size of the first connecting holes are opened on the second flange.

[0016] According to the extrusion device for extrusion molding of the utility model, further, the fastener is a bolt, and the bolt is used to pass through the first connecting hole and the second connecting hole in sequence to lock and connect the die base and the pressing cylinder.

[0017] According to the extrusion device for extrusion molding of the utility model, further, the extrusion piece includes a pressure rod and a pressure cake, both of which are separate components; the pressure cake is cylindrical and can be movably inserted in the first through hole of the pressure cylinder.

[0018] According to the extrusion device for extrusion molding of the utility model, further, the pressing rod includes a push rod and a pressure head fixed on the top of the push rod, the push rod and the pressure head are both cylindrical, and the diameter of the push rod is smaller than the diameter of the pressure head.

[0019] According to the extrusion device for extrusion molding of the utility model, further, the diameter of the pressure head is larger than the diameter of the first through hole.

[0020] The beneficial effects achieved by adopting the above technical solution are:

[0021] The utility model has a reasonable structural design and is easy to use. The extrusion device can be placed on a common hydraulic press or press to perform small (small batch) material extrusion molding. For research and development institutions and universities that lack large-scale special extrusion equipment, it reduces the investment in new equipment and saves expenses. At the same time, the amount of samples required for extrusion molding is greatly reduced, which reduces the tediousness of sample preparation during the extrusion process, improves the material yield of extrusion molding, and reduces sample loss during the extrusion process.

[0022] All parts of the utility model are detachable components, which are easy to disassemble and assemble. In addition, in order to obtain finished products of different sizes and models, it is only necessary to change the aperture of the extrusion hole of the mold core to perform extrusion molding, which effectively meets the diversity of test requirements.

[0023] The extrusion rod and the extrusion cake of the extrusion part of the utility model are designed to be separated. Usually, during the extrusion molding process, part of the sample to be processed will be squeezed and filled into the gap between the extrusion rod and the pressing cylinder, causing the extrusion rod to be blocked or stuck, and the extrusion rod is difficult to be knocked out of the pressing cylinder, thereby reducing the service life of the extrusion rod. Therefore, the design of the pressing cake directly bears the force instead of the extrusion rod, and the diameter of the extrusion rod is smaller than the diameter of the extrusion cake. When the above situation occurs, only the extrusion cake will be stuck. It is only necessary to pull the extrusion rod out of the pressing cylinder and then knock the extrusion cake out with a tool. While reducing the difficulty of operation, the service life of the extrusion rod is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. The drawings are only used to show some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0025] Figure 1 It is a disassembled schematic diagram of the extrusion device for extrusion molding of the utility model;

[0026] Figure 2 It is a structural schematic diagram of the mold base of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the mold core of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the pressing cylinder of the utility model;

[0029] Figure 5 It is a schematic diagram of a compression rod of an extrusion piece of the utility model.

[0030] The meanings of the numbers in the figure are:

[0031] 100. mold base, 110. fixing groove, 120. second through hole, 130. first flange, 140. first connecting hole, 150. mounting slot;

[0032] 200. mold core, 210. extrusion hole;

[0033] 300. Pressing cylinder, 310. First through hole, 320. Second flange, 330. Second connecting hole;

[0034] 400. Extrusion part, 410. Pressure rod, 411. Pressure head, 412. Push rod, 420. Press cake. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings of the specific embodiments of the utility model to clearly and completely describe the exemplary scheme of the utility model. Unless otherwise defined, the technical terms or scientific terms used in the utility model should be the common meanings understood by people with ordinary skills in the relevant field.

[0036] like Figure 1 As shown, the extrusion device for extrusion molding of this embodiment includes a die base 100, a die core 200, a pressing cylinder 300 and an extrusion piece 400. The die base 100 is used to support the extrusion device, and a fixing groove 110 is provided on the top of the die base 100; the die core 200 is used to change the shape of the sample to be processed, and the die core 200 is placed in the fixing groove 110 of the die base 100; the pressing cylinder 300 is fixed to the top of the die base 100 by a fastener, and a first through hole 310 is provided in the center of the pressing cylinder 300 in the vertical direction, and the sample to be processed is placed in the first through hole 310; the extrusion piece 400 is slidably inserted in the first through hole 310, and the extrusion piece 400 is used to extrude the sample to be processed in the first through hole 310.

[0037] It should be understood that the sample to be processed in this embodiment is generally a metal block object.

[0038] Further, the wall thickness of the pressing cylinder 300 is 1-2 times the diameter of the first through hole 310. Specifically, the wall thickness of the pressing cylinder 300 is 45 mm, and the diameter of the first through hole 310 is 30 mm, so as to ensure that the pressing cylinder 300 is not easily deformed during the extrusion molding process.

[0039] like Figure 1 and Figure 2 As shown, the mold base 100 is cylindrical, and a mounting slot 150 is provided at the middle and lower part of the mold base 100 ; a first flange 130 is circumferentially provided at the top of the mold base 100 , and a plurality of first connection holes 140 are evenly provided on the first flange 130 .

[0040] Furthermore, the number of the first connection holes 140 is four, and the diameter thereof is 10 mm.

[0041] like Figure 1 and Figure 2 As shown, a second through hole 120 is defined at the center of the fixing slot 110 .

[0042] like Figure 1 and Figure 3 As shown, an extrusion hole 210 communicating with the first through hole 310 is opened at the center of the mold core 200 .

[0043] After the sample to be processed in the first through hole 310 is squeezed by the extrusion piece 400, the sample to be processed passes through the extrusion hole 210 and becomes a filamentary finished product. Then, the filamentary finished product passes through the second through hole 120 of the fixing groove 110 and falls into the external collection box.

[0044] Furthermore, there is a clearance fit between the mold core 200 and the fixing groove 110, which facilitates the rapid replacement of the mold core 200 in actual production. Optionally, the mold core 200 has a diameter of 30 mm and a height of 10 mm; the diameter of the fixing groove is 30.2 mm and a height of 10 mm.

[0045] Furthermore, the diameter of the second through hole 120 needs to be larger than the diameter of the extrusion hole 210 of the mold core 200, so that the extruded material can pass through the mold base 100. Optionally, the diameter of the extrusion hole 210 of the mold core 200 is 3 mm, and the diameter of the second through hole 120 is 6 mm.

[0046] Furthermore, the die base 100, the pressing cylinder 300 and the extrusion piece 400 are all made of 316L or 310S stainless steel, and the die core 200 is made of high temperature resistant molybdenum-based ceramics, so as to ensure that each working part is not easily deformed during high temperature extrusion, and is suitable for extrusion molding below 900°C.

[0047] like Figure 1 and Figure 3 As shown, the pressing cylinder 300 is cylindrical, a second flange 320 is circumferentially arranged at the bottom of the pressing cylinder 300 , and a plurality of second connection holes 330 corresponding to the positions and sizes of the first connection holes 140 are opened on the second flange 320 .

[0048] Furthermore, the number of the second connection holes 330 is four, and the diameter thereof is 10 mm. The fastener used to connect the die base 100 and the pressing cylinder 300 is a Ø8 mm bolt, and the Ø8 mm bolt is sequentially passed through the first connection hole 140 and the second connection hole 330 to lock and connect the die base 100 and the pressing cylinder 300. When extruding samples of different sizes to be processed, the corresponding pressing cylinder 300 can be replaced by simply unscrewing the bolt.

[0049] like Figure 1 and Figure 4 As shown, the extrusion member 400 includes a pressing rod 410 and a pressing cake 420 , and the two are separate components; the pressing cake 420 is cylindrical and can be movably inserted into the first through hole 310 of the pressing cylinder 300 .

[0050] Furthermore, there is a clearance fit between the press cake 420 and the first through hole 310 of the press cylinder 300, and the clearance between the two is 0.1-0.3 mm. Specifically, the diameter of the press cake 420 is 29.5 mm, the height is 30 mm, and the diameter of the first through hole 310 is 30 mm, so the clearance between the press cake 420 and the first through hole 310 is 0.25 mm.

[0051] like Figure 1 and Figure 4 As shown, the pressure rod 410 includes a push rod 412 and a pressure head 411 welded to the top of the push rod 412 ; and the push rod 412 and the pressure head 411 are both cylindrical, and the diameter of the push rod 412 is smaller than that of the pressure head 411 .

[0052] Furthermore, there is also a clearance fit between the push rod 412 and the first through hole 310 of the pressing cylinder 300, and the clearance between the two is 1-2 mm. Specifically, the diameter of the pressing cake 420 is 29.5 mm, the diameter of the push rod 412 is 28 mm, and the diameter of the first through hole 310 is 30 mm, then the clearance between the push rod 412 and the first through hole 310 is 1 mm.

[0053] like Figure 1 As shown, the diameter of the pressure head 411 is larger than the diameter of the first through hole 300, and the pressure head 411 has a certain pressure-bearing thickness. Specifically, the diameter of the first through hole is 30 mm, the radius of the pressure head 411 is greater than 40 mm, and the thickness range is 10-20 mm. It is prevented that the experimenter makes an error operation and completely presses the pressure head 411 into the first through hole 300 of the pressure cylinder 300, making it inconvenient to remove the extrusion piece 400.

[0054] How this application works is:

[0055] Assembly of extrusion device:

[0056] 1) Place the mold core 200 into the fixing groove 110 of the mold base 100, ensuring that the mold core 200 is flush with the top surface of the mold base 100;

[0057] 2) Place the pressing cylinder 300 on the die base 100, and pass bolts through the first connecting hole 140 and the second connecting hole 330 in sequence, so that the die base 100 and the pressing cylinder 300 are locked and connected;

[0058] 3) After the sample to be processed is placed in the first through hole 310 of the pressing cylinder 300, the pressing cake 420 and the pressing rod 410 are sequentially placed in the first through hole 310. At this time, the sample to be processed and the pressing cake 420 are in contact with each other.

[0059] This completes the assembly of the extrusion device.

[0060] Extrusion molding process:

[0061] 1) Install the mold core 200 and the pressing cylinder 300 on the mold base 100 in sequence and put them together in a heating furnace, heat them to about 450°C, then take out the mold core 200, the pressing cylinder 300 and the mold base 100 and fix them on the chuck of a common hydraulic press or press;

[0062] 2) placing the sample to be processed into another heating furnace and heating it to a specific temperature (the temperature is set according to actual production requirements), then taking out the processed sample and placing it into the first through hole 310 of the pressing cylinder 300;

[0063] 3) placing the press cake 420 and the press rod 410 into the first through hole 310 in sequence, so that the press cake 420 is in contact with the sample to be processed;

[0064] 4) Start the hydraulic press or press, and the pressure is transmitted to the sample to be processed through the pressure rod 410 and the pressure cake 420. Under the pressure, the sample to be processed is gradually squeezed into the extrusion hole 210 of the mold core 200, and the sample to be processed passes through the extrusion hole 210 to form a filament-shaped finished product;

[0065] 5) The filamentous finished product passes through the second through hole 120 of the die base 100 and falls into the external collection box.

[0066] After the processed sample is completely extruded, turn off the hydraulic press or press and disassemble the various components of the extrusion device.

[0067] After multiple extrusion molding verifications, the material yield of extrusion molding using this extrusion device reached 73%.

[0068] It should be noted that when one element is “connected”, “coupled” or “connected” to another element, it may mean that they are directly connected, coupled or connected, but it should be understood that there may be intermediate elements between the two; that is, the positional relationships of direct connection and indirect connection are covered.

[0069] It should be noted that the use of "a" or "an" and similar words does not necessarily indicate a quantitative limitation. "Include" or "comprising" and similar words mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects.

[0070] It should be noted that terms such as "up", "down", "left" and "right" indicating orientation or positional relationship are only used to indicate relative positional relationship. This is for the convenience of describing the present utility model, and does not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0071] The preferred embodiments for implementing the present invention have been described in detail above, but it should be understood that the role of these embodiments is only to exemplify, and is not intended to limit the scope, applicability or configuration of the present invention in any way. The protection scope of the present invention is defined by the attached claims and their equivalents. A person of ordinary skill in the art can make many changes to the above embodiments under the guidance of the present invention, and these changes all fall within the protection scope of the present invention.

Claims

1. An extrusion device for extrusion molding, characterized in that: include: A die base, which is used to support the extrusion device, and a fixing groove is provided on the top of the die base; A mold core, which is used to change the shape of the sample to be processed, and the mold core is placed in a fixed groove of the mold base; A pressing cylinder, which is fixed to the top of the die base by a fastener, and a first through hole is opened in the center of the pressing cylinder along the vertical direction, and the sample to be processed is placed in the first through hole; and an extrusion piece, which is slidably inserted in the first through hole, and is used for extruding the sample to be processed in the first through hole.

2. The extrusion molding extrusion device according to claim 1, characterized in that: The mold base is cylindrical, a mounting slot is provided at the middle and lower part of the mold base, a first flange is circumferentially provided at the top of the mold base, and a plurality of first connecting holes are provided on the first flange.

3. The extrusion molding extrusion device according to claim 1, characterized in that: A second through hole is formed at the center of the fixing groove.

4. The extrusion molding extrusion device according to claim 3, characterized in that: An extrusion hole communicating with the second through hole is opened at the center of the mold core.

5. The extrusion molding extrusion device according to claim 2, characterized in that: The pressing cylinder is cylindrical, and a second flange is circumferentially arranged at the bottom of the pressing cylinder. A plurality of second connecting holes corresponding to the positions and sizes of the first connecting holes are opened on the second flange.

6. The extrusion molding extrusion device according to claim 5, characterized in that: The fastener is a bolt, and the bolt is used to pass through the first connecting hole and the second connecting hole in sequence to lock and connect the mold base and the pressing cylinder.

7. The extrusion molding extrusion device according to claim 1, characterized in that: The extrusion piece includes a pressure rod and a pressure cake, both of which are separate components; the pressure cake is cylindrical and can be movably inserted into the first through hole of the pressure cylinder.

8. The extrusion molding extrusion device according to claim 7, characterized in that: The pressure rod comprises a push rod and a pressure head fixed on the top of the push rod. The push rod and the pressure head are both cylindrical, and the diameter of the push rod is smaller than that of the pressure head.

9. The extrusion molding extrusion device according to claim 8, characterized in that: The diameter of the pressure head is larger than the diameter of the first through hole.

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