Extrusion-residue-free bar extrusion device
By connecting the extrusion gasket of the filling part on the extrusion shaft to match it with the deformation cavity, the problem of pressure residue at the tail of the rod is solved, the material utilization rate and production efficiency are improved, and continuous production without pressure residue is achieved.
Patent Information
- Application Number
- CN202510772090.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-11
- Publication Date
- 2025-07-11
AI Technical Summary
After the extrusion is completed, there is a pressure residue at the tail of the rod, resulting in a decrease in material utilization and production efficiency.
The press-free bar extrusion device is adopted. By connecting the extrusion gasket with a filling part on the extrusion shaft, it matches the shape of the deformation cavity. During the extrusion process, the side wall of the filling part is bonded to the inner wall of the deformation cavity to ensure that the blank completely enters the sizing cavity and avoids no deformation of the tail or small deformation.
The material utilization rate and production efficiency are improved, the pressure residue and severe tail shrinkage of the rod tail are avoided, and continuous production is achieved.
Smart Images
Figure CN120286529A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of metal processing, and more specifically, to a non-pressure-remaining bar extrusion device. Background Art
[0002] Since it is not easy to crack bars forged by extrusion and the production efficiency is relatively high, currently, bars of high-value-added and difficult-to-deform alloy materials such as nickel-based alloys and titanium alloys are gradually produced by extrusion. When using a traditional bar extrusion device to extrude bars, since the extrusion shaft is a regular cylinder, when the extrusion shaft contacts the entrance of the extrusion die, the extrusion ends, but there is still a part of the blank remaining in the deformation zone of the extrusion die. After that, a jacking device is still needed to jack the extruded bar and the pressure residue back in the opposite direction to complete the demoulding. After the extrusion is completed, there is a pressure residue with no deformation or very little deformation at the tail of the bar. The internal structure of the pressure residue part does not meet the requirements and needs to be cut off during subsequent machining. Moreover, after the extrusion is completed, a jacking mechanism is needed to jack the extruded bar back along the original path to complete the demoulding, and continuous production cannot be achieved, resulting in a reduction in material utilization rate, production efficiency, and an increase in manufacturing cost. Summary of the Invention
[0003] The problem solved by the present invention is that there is a pressure residue at the tail of the bar obtained by extruding with the existing bar extrusion device, resulting in a reduction in material utilization rate and production efficiency.
[0004] To solve the above problems, the present invention provides a non-pressure-remaining bar extrusion device, which includes an extrusion die, an extrusion cylinder, an extrusion shaft, and an extrusion gasket. The extrusion shaft and the extrusion gasket are both arranged in the extrusion cylinder. The extrusion gasket is connected to the extrusion end of the extrusion shaft. The extrusion gasket includes a filling part. The extrusion die is a cylindrical structure. The inlet end of the extrusion die is correspondingly connected to the outlet end of the extrusion cylinder. The inner cavity of the extrusion die is composed of a deformation cavity and a sizing cavity along the axial direction. The deformation cavity is located at the inlet end of the extrusion die. The shape of the filling part matches the shape of the deformation cavity. During the extrusion process, when the filling part just reaches the boundary line between the deformation cavity and the sizing cavity, the side wall of the filling part fits with the inner wall of the deformation cavity.
[0005] Preferably, it further includes an annular filling pad. The annular filling pad is sleeved on the side wall of the filling part. The annular filling pad, the extrusion gasket, and the extrusion shaft together form a columnar extrusion unit. The material of the annular filling pad is glass powder.
[0006] Preferably, the melting point of the glass powder is lower than 900 °C.
[0007] Preferably, the inner diameter of the inlet end of the deformation cavity, the inner diameter of the extrusion cylinder, and the diameter of the extrusion unit are all the same.
[0008] Preferably, an annular lubricating pad is provided on the inner wall of the outlet end of the extrusion cylinder, and the annular lubricating pad is made of glass powder.
[0009] Preferably, the deformation cavity is frustum-shaped, and the inner diameter of the inlet end of the deformation cavity is larger than the inner diameter of the outlet end of the deformation cavity.
[0010] Preferably, the vertical cross-section of the deformation cavity is an isosceles trapezoid, and the base angle of the isosceles trapezoid is 30 degrees to 80 degrees.
[0011] Preferably, the extrusion gasket further includes a transition portion and a first connection portion. The filling portion, the transition portion and the first connection portion are connected in sequence. A second connection portion is provided at the extrusion end of the extrusion shaft, and the first connection portion is connected to the second connection portion.
[0012] Preferably, the first connection portion is a bolt, and the second connection portion is a threaded hole corresponding to the bolt.
[0013] Preferably, the extrusion gasket is made of die steel.
[0014] Compared with the related art, when using the bar extrusion device provided by the present invention, during use, the blank is placed in the extrusion cylinder, the lower end of the blank is abutted against the filling portion, and then an external force is applied to cause the blank to undergo extrusion deformation through the deformation cavity and then enter the sizing cavity (the blank does not deform when passing through the sizing cavity), and then the blank is extruded from the sizing cavity to obtain a bar. Since the extrusion end of the extrusion shaft is connected with an extrusion gasket having a filling portion, and the shape of the filling portion matches the shape of the deformation cavity, when the filling portion contacts the entrance of the extrusion die, the extrusion is not over, and the extrusion shaft continues to move upward until the side wall of the filling portion fits against the inner wall of the deformation cavity. At this time, the filling portion contacts the boundary line between the deformation cavity and the sizing cavity, and the blank is completely pushed into the sizing cavity. After the extrusion is completed, the tail of the blank also undergoes effective extrusion deformation in the deformation cavity. Therefore, there is no non-deformed or very small deformed upset at the tail of the obtained bar, which can improve the material utilization rate and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic structural diagram of the bar extrusion device without upset in the embodiment of the present invention; Figure 2 is a schematic structural diagram of the bar extrusion device before improvement; Figure 3 is a physical diagram of the bar obtained by using the bar extrusion device with an annular filling pad in the embodiment of the present invention; Figure 4 is a physical diagram of the bar obtained by using the bar extrusion device without an annular filling pad in the embodiment of the present invention; Figure 5 is a schematic structural diagram of the extrusion gasket in the embodiment of the present invention.
[0016] Description of the reference numerals in the drawings: 1. Extrusion die; 11. Deformation cavity; 12. Sizing cavity; 2. Extrusion cylinder; 3. Extrusion shaft; 4. Extrusion gasket; 41. Filling part; 42. Transition part; 43. First connecting part; 5. Blank; 6. Annular filling pad; 7. Annular lubricating pad. Detailed implementation manners
[0017] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description will be given to specific embodiments of the present invention with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.
[0018] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the present invention in the specification are only for the purpose of describing specific implementation manners and are not intended to limit the present invention.
[0019] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.
[0020] It should be noted that Figure 1 the direction indicated by the arrow X is upward, that is, the direction of the movement of the blank during the extrusion process; as Figure 1As shown, during the extrusion process, the blank 5 moves from bottom to top. The lower end of the extrusion die 1 is the inlet end of the extrusion die 1, the upper end of the extrusion die 1 is the outlet end of the extrusion die 1, and the upper end of the extrusion cylinder 2 is the outlet end of the extrusion cylinder 2. In the present invention, the extrusion end of the extrusion shaft 3 is the end of the extrusion shaft 3 that is close to the blank 5 during the extrusion of the blank 5. For example, Figure 1 as shown, the extrusion end of the extrusion shaft 3 is the upper end of the extrusion shaft 3.
[0021] For example, Figure 1 as shown, the present embodiment provides a bar extrusion device without a pressure residue, including an extrusion die 1, an extrusion cylinder 2, an extrusion shaft 3, and an extrusion gasket 4. The extrusion shaft 3 and the extrusion gasket 4 are both arranged inside the extrusion cylinder 2. The extrusion gasket 4 is connected to the extrusion end of the extrusion shaft 3. The extrusion gasket 4 includes a filling portion 41. The extrusion die 1 is of a cylindrical structure. The inlet end of the extrusion die 1 is correspondingly connected to the outlet end of the extrusion cylinder 2. The inner cavity of the extrusion die 1 consists of a deformation cavity 11 and a sizing cavity 12 along the axial direction. The deformation cavity 11 is located at the inlet end of the extrusion die 1. The shape of the filling portion 41 matches the shape of the deformation cavity 11. During the extrusion process, when the filling portion 41 just reaches the boundary line between the deformation cavity 11 and the sizing cavity 12, the side wall of the filling portion 41 fits against the inner wall of the deformation cavity 11.
[0022] It should be noted that in the present invention, the shape of the filling portion 41 matching the shape of the deformation cavity 11 should be understood as that the shape and size of the filling portion 41 are the same as the shape and size of the deformation cavity 11, so that the filling portion 41 can just be embedded in the deformation cavity 11.
[0023] Figure 2 The bar extrusion device before improvement is shown. It can be seen that the extrusion end of the extrusion shaft 3 of this extrusion device does not have an extrusion gasket 4. When using this extrusion device to extrude bars, since the extrusion shaft 3 is a cylinder, when the extrusion shaft 3 contacts the inlet of the extrusion die 1, the extrusion ends, but the tail of the blank 5 is still located in the deformation cavity 11 of the extrusion die 1. That is to say, the tail of the blank 5 does not undergo effective extrusion deformation in the deformation cavity 11. After that, a jacking device is needed to jack the extruded bar back in the reverse direction to complete the demolding. After the extrusion is completed, there is a pressure residue with no deformation and very little deformation amount at the tail of the obtained bar. The internal structure of the pressure residue part does not meet the quality requirements and needs to be cut off during subsequent machining. Moreover, after the extrusion is completed, a jacking mechanism is needed to jack the extruded bar back along the original path to complete the demolding, and continuous production cannot be carried out, resulting in a reduction in material utilization rate, production efficiency, and an increase in manufacturing cost.
[0024] For example, Figure 1As shown in the figure, when using the bar extrusion device provided by the embodiment of the present invention, during use, the blank 5 is placed in the extrusion cylinder 2, and the lower end of the blank 5 abuts against the filling part 41. Then, an external force is applied to cause the blank 5 to undergo extrusion deformation through the deformation cavity 11 and then enter the sizing cavity 12 (the blank 5 does not deform when passing through the sizing cavity 12). Subsequently, the blank 5 is extruded from the sizing cavity 12 to obtain a bar. Since the extrusion end of the extrusion shaft 3 is connected with an extrusion gasket 4 having a filling part 41, and the shape of the filling part 41 matches the shape of the deformation cavity 11, when the filling part 41 contacts the entrance of the extrusion die 1, the extrusion is not over. The extrusion shaft 3 continues to move upward until the side wall of the filling part 41 fits against the inner wall of the deformation cavity 11. At this time, the filling part 41 contacts the boundary line between the deformation cavity 11 and the sizing cavity 12, and the blank 5 is completely pushed into the sizing cavity 12. After the extrusion is completed, the tail of the blank 5 also undergoes effective extrusion deformation in the deformation cavity 11. Therefore, there is no non-deformed or very small deformation residue at the tail of the obtained bar, which can improve the material utilization rate and production efficiency.
[0025] As Figure 1 shown in the figure, since the shape of the deformation cavity 11 is a frustum shape, the matching filling part 41 is also frustum-shaped. During the extrusion process, the working surface of the filling part 41 cannot completely cover the extruded surface (the tail of the blank 5) of the blank 5, and there is a gap between the blank 5 and the filling part 41. During the extrusion process, the force on the extruded surface of the blank 5 is mainly concentrated in the middle area, resulting in serious tail shrinkage of the obtained bar, and the inner concave of the bar tail forms a flared shape.
[0026] In some embodiments of the present invention, in order to further avoid the serious tail - shrinking phenomenon of the bar, the bar extrusion device further includes an annular filling pad 6. The annular filling pad 6 is sleeved on the side wall of the filling part 41. The annular filling pad 6, the extrusion gasket 4 and the extrusion shaft 3 together form a columnar extrusion unit. The material of the annular filling pad 6 is glass powder. Thus, before the filling part 41 enters the extrusion die 1, the upper end surface of the columnar extrusion unit completely covers the extruded surface of the blank 5, and there is no gap between the blank 5 and the filling part 41, making the force on the tail of the blank 5 more uniform and avoiding serious tail - shrinking of the blank 5. As the extrusion continues, the filling part 41 enters the extrusion die 1. Under the combined action of high temperature (the temperature of the blank 5 is relatively high during extrusion) and extrusion force, the annular filling pad 6 made of glass powder will partially melt, and the non - meltable part of the annular filling pad 6 will also be extruded from the extrusion die 1. Finally, the side wall of the filling part 41 fits with the inner wall of the deformation cavity 11. After the extrusion is completed, the tail of the blank 5 also undergoes effective extrusion deformation in the deformation cavity 11. Therefore, there is no non - deformed or very small - deformation pressing residue at the tail of the obtained bar. Since the time from when the filling part 41 enters the extrusion die 1 to the end of extrusion is relatively short, during this process, the time when the tail of the blank 5 is subjected to uneven force is short, and no serious tail - shrinking phenomenon will occur. It can be seen that using the bar extrusion device in this embodiment can not only avoid the pressing residue at the tail of the bar, but also avoid the serious tail - shrinking phenomenon of the bar. Figure 3 For the bar made by using the extrusion device of this embodiment, from Figure 3 it can be seen that the tail - shrinking of the bar is small; after removing the annular filling pad 6 in the extrusion device of this embodiment, Figure 4 for the bar made by using this device, from Figure 4 it can be seen that the tail - shrinking of the bar is serious.
[0027] For the case where the material of the bar is nickel - based alloy, titanium alloy, aluminum alloy, or magnesium alloy, in some embodiments of the present invention, the melting point of the glass powder is lower than 900 °C. Exemplarily, the manufacturer of the glass powder is Beijing Tianli Chuang Glass Technology Development Co., Ltd., and the product model is MF - TE4 or MF - TD4.
[0028] As Figure 1 shown, in some embodiments of the present invention, the inner diameter of the inlet end of the deformation cavity 11, the inner diameter of the extrusion cylinder 2, and the diameter of the extrusion unit are all the same. During the extrusion process, the extrusion die 1, the extrusion cylinder 2, the blank 5, and the extrusion unit are in a co - axial state.
[0029] In some embodiments of the present invention, an annular lubricating pad 7 is provided on the inner wall of the outlet end of the extrusion cylinder 2, and the annular lubricating pad 7 is made of glass powder. During the extrusion process, the annular lubricating pad 7 plays a role of continuous lubrication. Under the combined action of high temperature (the temperature of the blank 5 is relatively high during extrusion) and extrusion pressure, the annular lubricating pad 7 made of glass powder will melt or be extruded from the device. In this embodiment, the melting point of the glass powder is lower than 900 °C. Exemplarily, the manufacturer of the glass powder is Beijing Tianli Chuang Glass Technology Development Co., Ltd., and the product model is MF-TE4 or MF-TD4.
[0030] In some embodiments of the present invention, specifically, the deformation cavity 11 is frustum-shaped, and the inner diameter of the inlet end of the deformation cavity 11 is larger than the inner diameter of the outlet end of the deformation cavity 11.
[0031] In some embodiments of the present invention, the vertical cross-section of the deformation cavity 11 is an isosceles trapezoid, and the base angle of the isosceles trapezoid is 30 degrees to 80 degrees.
[0032] In some embodiments of the present invention, as Figure 1 and Figure 5 shown, the extrusion gasket 4 further includes a transition portion 42 and a first connection portion 43. The filling portion 41, the transition portion 42, and the first connection portion 43 are connected in sequence. A second connection portion is provided at the extrusion end of the extrusion shaft 3, and the first connection portion 43 is connected to the second connection portion. Exemplarily, the first connection portion 43 is a bolt, and the second connection portion is a threaded hole corresponding to the bolt.
[0033] In some embodiments of the present invention, the extrusion gasket 4 is made of die steel.
[0034] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.
Claims
1. An extrusion device for non-pressure remaining bars, characterized in that, It includes an extrusion die (1), an extrusion cylinder (2), an extrusion shaft (3) and an extrusion gasket (4). The extrusion shaft (3) and the extrusion gasket (4) are both arranged inside the extrusion cylinder (2). The extrusion gasket (4) is connected to the extrusion end of the extrusion shaft (3). The extrusion gasket (4) includes a filling part (41). The inlet end of the extrusion die (1) is correspondingly connected to the outlet end of the extrusion cylinder (2). The inner cavity of the extrusion die (1) consists of a deformation cavity (11) and a sizing cavity (12) axially. The deformation cavity (11) is located at the inlet end of the extrusion die (1). The shape of the filling part (41) matches the shape of the deformation cavity (11). During the extrusion process, when the filling part (41) just reaches the boundary line between the deformation cavity (11) and the sizing cavity (12), the side wall of the filling part (41) fits against the inner wall of the deformation cavity (11).
2. The non-pressure residual bar extrusion device according to claim 1, wherein It further includes an annular filling pad (6). The annular filling pad (6) is sleeved on the side wall of the filling part (41). The annular filling pad (6), the extrusion gasket (4) and the extrusion shaft (3) together form a columnar extrusion unit. The material of the annular filling pad (6) is glass powder.
3. The non-pressure redundant bar extrusion device according to claim 2, characterized in that, The melting point of the glass powder is lower than 900 °C.
4. The non-pressure redundant bar extrusion device according to claim 2, wherein, The inner diameter of the inlet end of the deformation cavity (11), the inner diameter of the extrusion cylinder (2) and the diameter of the extrusion unit are all the same.
5. The non-pressure remaining bar extrusion device according to claim 1, characterized in that, An annular lubricating pad (7) is provided on the inner wall of the outlet end of the extrusion cylinder (2). The material of the annular lubricating pad (7) is glass powder.
6. The non-pressure remaining bar extrusion device according to claim 1, characterized in that, The deformation cavity (11) is frustum-shaped, and the inner diameter of the inlet end of the deformation cavity (11) is larger than the inner diameter of the outlet end of the deformation cavity (11).
7. The non-pressure redundant bar extrusion device according to claim 6, wherein, The vertical cross-section of the deformation cavity (11) is an isosceles trapezoid, and the base angle of the isosceles trapezoid is 30 degrees to 80 degrees.
8. The non-pressure redundant bar extrusion device according to claim 1, characterized in that, The extrusion gasket (4) further includes a transition part (42) and a first connection part (43). The filling part (41), the transition part (42) and the first connection part (43) are connected in sequence. The extrusion end of the extrusion shaft (3) is provided with a second connection part, and the first connection part (43) is connected to the second connection part.
9. The non-pressure surplus bar extrusion device according to claim 8, characterized in that, The first connection part (43) is a bolt, and the second connection part is a threaded hole corresponding to the bolt.
10. The non-pressure surplus bar extrusion device according to any one of claims 1-9, characterized in that, The material of the extrusion gasket (4) is die steel.