Cold drawing die for precise seamless steel pipe
By introducing a combination of the die core switching disc and the motor drive shaft in the cold-dial mold, the problem of core wear affecting accuracy and cumbersome replacement is solved, and the rapid adaptation of the die core and efficient and precise steel pipe processing are achieved.
Patent Information
- Application Number
- CN202411797646.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-02-07
AI Technical Summary
The core of existing cold-drift molds will wear after a long time of use, affecting the processing accuracy of steel pipes. The core replacement is cumbersome and has low adaptability. Multiple groups of molds are needed to adapt to steel pipes of different diameters and specifications.
A cold-dial mold for precision seamless steel pipes is designed, using a combination of a die-core switching disc and a motor drive shaft to adapt to steel pipes of different diameters and specifications by quickly replacing the die-core body.
It realizes rapid replacement and adaptation of die cores, improves the accuracy and efficiency of steel pipe processing, and reduces the complexity of mold replacement and low adaptation.
Smart Images
Figure CN119387332A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of cold drawing dies, and in particular to a cold drawing die for a precision seamless steel pipe. Background Art
[0002] Cold drawing is a metal processing technology. It is mainly a method of pulling out the material through a die hole by applying a pulling force at one end of the material under room temperature conditions. The aperture of the die should be smaller than the diameter of the material, so that the material can be stretched and extruded when passing through the die, thereby improving the structure and performance of the material. Cold drawn tube is a seamless steel tube made by multiple cold drawing and stretching processes. It has the characteristics of high precision, good mechanical properties and good seamlessness. It is widely used in machinery manufacturing, automobile manufacturing, aerospace and petrochemical industries.
[0003] The existing cold drawing molds still have the following problems when in use: the mold core in the existing mold will be worn after a long period of use, and the continued use of the damaged mold core may affect the processing accuracy of the steel pipe. The replacement of the mold core inside the existing mold is cumbersome. Usually, the mold core and the mold are threadedly connected by multiple sets of screws, which makes it inconvenient to replace the mold core. In addition, most of the mold shells only have one specification of mold core installed, which results in a low adaptability of the mold. When it is necessary to produce steel pipes of different diameters, multiple sets of molds are required.
[0004] Therefore, it is necessary to invent a cold drawing die for a precision seamless steel pipe to solve the above problems. Summary of the invention
[0005] The purpose of the present invention is to provide a cold drawing die for precision seamless steel pipes, so as to solve the problem mentioned in the above background technology that the core of the existing mold will be worn after a long period of use, and the continued use of the damaged core may affect the processing accuracy of the steel pipe. The replacement of the core inside the existing mold is cumbersome. Usually, the core and the mold are threadedly connected by multiple sets of screws, which makes it inconvenient to replace the core. In addition, most of the mold shells only have one specification of core installed, which leads to low adaptability of the mold and the need for multiple sets of molds when producing steel pipes of different diameters.
[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cold drawing die for a precision seamless steel pipe, comprising an outer frame, an inner cavity is provided inside the outer frame, a replacement port is provided on the inner side of the outer frame, a notch is provided inside the outer frame, a motor is fixedly connected to the outer wall of the outer frame, and the output shaft of the motor is transmission-connected to the drive shaft, the end of the drive shaft is rotationally connected to the inner wall of the inner cavity through a bearing, a core switching disk is fixedly sleeved on the outer wall of the drive shaft, and the rotation of the drive shaft drives the core switching disk to rotate in the inner cavity, thereby facilitating the rapid replacement of the core body to be used, ensuring the overall processing efficiency of the steel pipe, and the core switching disk is internally threadedly connected to the core body, and further comprising:
[0007] The disassembly and replacement assembly comprises: a thread is arranged on the outer ring of the core body, and the thread is threadedly connected with the thread groove reserved inside the core switching disk, an annular groove is arranged inside the thread groove, and an annular block is rotatably connected inside the annular groove, and a protrusion is fixedly connected to the inner wall of the annular block, and the protrusion is slidably connected with the groove reserved inside the core body, so that the core body and the core switching disk can be replaced by twisting the core body to ensure the subsequent processing effect of the steel pipe.
[0008] Preferably, the inner cavity is annular, and part of the inner wall of the inner cavity is in contact with part of the outer wall of the core switching disk that is rotatably connected inside the inner cavity to achieve rotational connection, and the thickness of the core switching disk is smaller than the thickness of the inner cavity to ensure the stability of the core switching disk during rotation.
[0009] Preferably, the inner wall of the inner cavity is fixedly connected to a limit ring, and the outer wall of the limit ring is in contact with the inner wall of the limit groove reserved inside the core switching disk to achieve a sliding connection, thereby ensuring the stability of the core switching disk during rotation and ensuring the smooth switching process of the core body.
[0010] Preferably, the core bodies are provided in total of six pieces, and the six core bodies are distributed in a circular shape at equal angles inside the core switching disk, and the diameters of the inner circles of the six core bodies increase successively, so that it is convenient to quickly switch the core bodies when the core switching disk rotates, ensuring that the appropriate core body is opposite to the notch, thereby ensuring better use of the mold body.
[0011] Preferably, the outer wall of the end of the core body has a section with a smooth surface, and the end of the core body with the smooth surface is aligned with the groove of the thread groove, so that the sliding connection between the smooth end of the core body and the thread groove is unobstructed, so that the groove reserved inside the core body is adapted to the protrusion.
[0012] Preferably, the two ends of the core body are in contact with the two side walls opposite to the inner cavity and are slidably connected when the two ends of the core body are completely matched with the internal thread groove of the core switching disk.
[0013] Preferably, the inner ring diameter of the annular block is smaller than the inner ring diameter of the annular groove, and the inner wall of each annular block is fixedly connected with two protrusions symmetrically arranged with reference to the central axis of the annular block as the symmetry axis, and the protrusions extend away from the end of the annular block to the interior of the threaded groove, and the threaded groove is connected to the annular groove, so that the annular block will not affect the smooth threaded connection between the core body and the threaded groove.
[0014] Preferably, the two grooves are symmetrically arranged on both sides of the core body with reference to the central axis of the core body as the symmetry axis, and one end of the groove is closed, and the other end of the groove is open. In this way, when the core body is twisted until the protrusion abuts against the closed end of the groove and cannot continue to rotate, the core body and the core switching disk are fully matched and installed. When the core body and the core switching disk are fully matched and installed, the core body is provided with a smooth end extending beyond the threaded groove. This also facilitates the subsequent rotation of the smooth end of the core body so that the core body can rotate and disengage from the threaded groove, thereby facilitating the disassembly and assembly of the core body and the core switching disk.
[0015] In the above technical solution, the technical effects and advantages provided by the present invention are:
[0016] 1. The present invention starts the motor to drive the core switching disk on the outer wall of the driving shaft to rotate. Whenever the driving shaft rotates to adjust the rotation degree of the core switching disk, the core body corresponding to the notch position reserved inside the outer frame will be switched. This is convenient for selecting a core body with a suitable inner ring diameter according to actual conditions, which is convenient for quick replacement of the core body and makes the mold more applicable.
[0017] 2. The threaded connection between the core body and the core switching disk ensures the stability of the connection between the core body and the core switching disk while facilitating the replacement and installation of the core body and the core switching disk. In this way, the core body with severe damage can be replaced promptly and quickly to ensure the accuracy of subsequent steel pipe processing;
[0018] 3. First match the smooth end of the core body with the groove opening. After the protrusion matches the open end of the groove, rotate the core body to make it threadedly connected with the thread groove. When the groove synchronizes the movement of the core body so that the closed end of the groove is against the protrusion, the core body and the thread groove are completely matched and installed. This makes it convenient for the staff to confirm whether the core body is completely matched with the core switching disk, ensuring that the core body and the core switching disk are firmly installed. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.
[0020] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;
[0021] Figure 2 It is an exploded view of the connection structure between the outer frame and the mold core switching disk of the present invention;
[0022] Figure 3 It is an exploded view of the connection structure between the outer frame (partially cut away) and the mold core switching disk of the present invention;
[0023] Figure 4 It is an exploded view of the connection structure between the mold core switching disk (partially cut away) and the mold core body of the present invention;
[0024] Figure 5 For the present invention Figure 4 Schematic diagram of the structure magnification effect at A in the middle;
[0025] Figure 6 It is an exploded view of the connection structure between the mold core switching disk and the mold core body of the present invention.
[0026] Description of reference numerals:
[0027] 1. Outer frame; 2. Notch; 3. Inner cavity; 4. Disassembly port; 5. Core switching disk; 6. Motor; 7. Drive shaft; 8. Limiting ring; 9. Limiting groove; 10. Core body; 11. Disassembly assembly; 1101. Thread; 1102. Thread groove; 1103. Annular groove; 1104. Annular block; 1105. Bump; 1106. Channel. DETAILED DESCRIPTION
[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
[0029] The present invention provides Figure 1-6A cold drawing die for a precision seamless steel pipe shown in the figure comprises an outer frame 1, an inner cavity 3 is provided inside the outer frame 1, a replacement port 4 is provided on the inner side of the outer frame 1, a notch 2 is provided inside the outer frame 1, a motor 6 is fixedly connected to the outer wall of the outer frame 1, and the output shaft of the motor 6 is transmission-connected to a drive shaft 7, the end of the drive shaft 7 is rotationally connected to the inner wall of the inner cavity 3 through a bearing, a core switching disk 5 is fixedly sleeved on the outer wall of the drive shaft 7, and the rotation of the drive shaft 7 drives the core switching disk 5 to rotate in the inner cavity 3, thereby facilitating the rapid replacement of the core body 10 to be used, ensuring the overall processing efficiency of the steel pipe, and the core switching disk 5 is internally threadedly connected to the core body 10, and further comprises:
[0030] The disassembly and replacement component 11, the outer ring of the core body 10 is provided with a thread 1101, and the thread 1101 is threadedly connected with the thread groove 1102 reserved inside the core switching disk 5, the internal connection of the thread groove 1102 is provided with an annular groove 1103, and the internal rotation connection of the annular groove 1103 is provided with an annular block 1104, and the inner wall of the annular block 1104 is fixedly connected with a protrusion 1105, the protrusion 1105 and the groove 1106 reserved inside the core body 10 are in sliding connection, which facilitates the twisting of the core body 10 to realize the replacement of the core body 10 and the core switching disk 5, and ensures the subsequent processing effect of the steel pipe.
[0031] The inner cavity 3 is annular, and part of the inner wall of the inner cavity 3 is in contact with and rotationally connected to part of the outer wall of the core switching disk 5 that is rotatably connected inside the inner cavity 3, and the thickness of the core switching disk 5 is smaller than the thickness of the inner cavity 3, thereby ensuring the stability of the core switching disk 5 during rotation.
[0032] The inner wall of the inner cavity 3 is fixedly connected with a limit ring 8, and the outer wall of the limit ring 8 is in contact with the inner wall of the limit groove 9 reserved inside the core switching disk 5 to achieve a sliding connection, thereby ensuring the stability of the core switching disk 5 during rotation and ensuring the smooth switching process of the core body 10.
[0033] There are six core bodies 10 in total, and the six core bodies 10 are distributed in a circular shape at equal angles inside the core switching disk 5, and the diameters of the inner circles of the six core bodies 10 increase successively, so that it is convenient to quickly switch the core bodies 10 when the core switching disk 5 rotates, ensuring that the appropriate core body 10 is opposite to the notch 2, thereby ensuring a better use effect of the mold body.
[0034] There is a smooth section on the outer wall of the end of the core body 10. The smooth end of the core body 10 is aligned with the notch of the thread groove 1102. The sliding connection between the smooth end of the core body 10 and the thread groove 1102 is unobstructed, so that the groove 1106 reserved inside the core body 10 is adapted to the protrusion 1105.
[0035] The two ends of the core body 10 are in contact with the two opposite side walls of the inner cavity 3 and are slidably connected when the two ends of the core body 10 are completely matched with the internal thread groove 1102 of the core switching disk 5 .
[0036] The inner diameter of the annular block 1104 is smaller than the inner diameter of the annular groove 1103, and the inner wall of each annular block 1104 is fixedly connected with two protrusions 1105 which are symmetrically arranged with reference to the central axis of the annular block 1104 as the symmetry axis, and the protrusions 1105 extend away from the end of the annular block 1104 to the inside of the threaded groove 1102, and the threaded groove 1102 is connected with the annular groove 1103, so that the annular block 1104 will not affect the smooth threaded connection between the core body 10 and the threaded groove 1102.
[0037] The two grooves 1106 are symmetrically arranged on both sides of the core body 10 with reference to the central axis of the core body 10 as the symmetry axis, and one end of the groove 1106 is closed, and the other end of the groove 1106 is open. In this way, when the core body 10 is twisted until the protrusion 1105 presses against the closed end of the groove 1106 and cannot continue to rotate, the core body 10 and the core switching disk 5 are fully matched and installed. When the core body 10 and the core switching disk 5 are fully matched and installed, the core body 10 is provided with a smooth end extending to the part outside the thread groove 1102. This also facilitates the subsequent rotation of the smooth end of the core body 10 so that the core body 10 rotates and realizes the disengagement movement of the thread groove 1102, thereby facilitating the disassembly and assembly of the core body 10 and the core switching disk 5.
[0038] Working principle: When using a cold drawing mold for a precision seamless steel pipe, first start the motor 6 to drive the rotation of the drive shaft 7 connected to the output shaft of the motor 6. When the drive shaft 7 rotates, it drives the rotation of the core switching disk 5 fixedly sleeved on the outer wall of the drive shaft 7 and located inside the annular inner cavity 3. Six core bodies 10 are connected with annular threads at equal angles on the core switching disk 5. The inner diameters of the six core bodies 10 are different. In this way, whenever the drive shaft 7 rotates to adjust the core switching disk 5 to rotate 60 degrees, the core body 10 corresponding to the notch 2 reserved inside the outer frame 1 will be switched. This makes it more convenient to select the core body 10 with a suitable inner diameter size according to the actual situation, so that the replacement speed of the core body 10 inside the overall mold is faster, ensuring that the mold body is more usable;
[0039] The core body 10 will be worn after long-term use, which will cause errors in the subsequent processing dimensions of the cold-drawn steel pipe. At this time, the core body 10 needs to be maintained and replaced to ensure the processing accuracy of the steel pipe. When the core body 10 needs to be replaced, first repeat the above-mentioned operation steps to start the motor 6 to drive the core switching disk 5 fixedly plugged into the outer wall of the drive shaft 7 to rotate, so that the core body 10 to be replaced rotates to the replacement port 4 reserved inside the outer frame 1, and the end of the core body 10 is twisted. In this way, the core body 10 which is threadedly connected to the core switching disk 5 gradually leaves the inside of the thread groove 1102 reserved in the core switching disk 5 when it rotates. At this time, it is convenient to remove the core body 10. When installing a new core body 10, align the tail end of the part of the core body 10 that is not provided with the thread 1101 with the notch of the thread groove 1102 and make the protrusion 1105 match the groove 1106 first. After the mold core body 10 is matched for the first time with the thread groove 1102, the mold core body 10 is rotated so that the mold core body 10 and the thread groove 1102 are threadedly connected. During the rotation of the mold core body 10, the protrusion 1105 fixedly connected to the inner wall of the annular block 1104 rotatably connected to the annular groove 1103 is movably connected with the groove 1106. During the rotation of the mold core body 10, the annular block 1104 rotates synchronously, which does not affect the smooth threaded connection between the mold core body 10 and the thread groove 1102. At the same time, the position movement of the mold core body 10 during the rotation process matches the depth of the thread groove 1102. When the groove 1106 synchronizes the movement of the mold core body 10 so that the closed end of the groove 1106 abuts against the protrusion 1105, the mold core body 10 and the thread groove 1102 are completely matched and installed, that is, the mold core body 10 and the core switching disk 5 are matched and installed, ensuring the subsequent use of the mold core body 10.
[0040] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A cold drawing die for a precision seamless steel pipe, comprising an outer frame (1), characterized in that: An inner cavity (3) is provided inside the outer frame (1), a disassembly port (4) is provided on the inner side of the outer frame (1), a notch (2) is provided inside the outer frame (1), a motor (6) is fixedly connected to the outer wall of the outer frame (1), and the output shaft of the motor (6) is transmission-connected to a drive shaft (7), an end of the drive shaft (7) is rotationally connected to the inner wall of the inner cavity (3) via a bearing, a core switching disk (5) is fixedly sleeved on the outer wall of the drive shaft (7), and the inner part of the core switching disk (5) is threadedly connected to a core body (10), and further comprises: A disassembly and replacement component (11), wherein the outer ring of the core body (10) is provided with a thread (1101), and the thread (1101) is threadedly connected to a thread groove (1102) reserved inside the core switching disk (5), the interior of the thread groove (1102) is connected to an annular groove (1103), and the interior of the annular groove (1103) is rotatably connected to an annular block (1104), and the inner wall of the annular block (1104) is fixedly connected to a protrusion (1105), and the protrusion (1105) is slidably connected to a groove (1106) reserved inside the core body (10).
2. The cold drawing die for a precision seamless steel pipe according to claim 1, characterized in that: The inner cavity (3) is annular, and part of the inner wall of the inner cavity (3) is in contact with and rotationally connected to part of the outer wall of a core switching disk (5) that is rotationally connected inside the inner cavity (3), and the thickness of the core switching disk (5) is smaller than the thickness of the inner cavity (3).
3. The cold drawing die for a precision seamless steel pipe according to claim 1, characterized in that: The inner wall of the inner cavity (3) is fixedly connected to a limit ring (8), and the outer wall of the limit ring (8) is in contact with the inner wall of a limit groove (9) reserved inside the mold core switching disk (5) to achieve a sliding connection.
4. The cold drawing die for a precision seamless steel pipe according to claim 1, characterized in that: The core bodies (10) are provided in a total of six pieces, and the six core bodies (10) are distributed in a ring-shaped manner at equal angles inside the core switching disk (5), and the diameters of the inner circles of the six core bodies (10) increase in sequence.
5. The cold drawing die for a precision seamless steel pipe according to claim 1, characterized in that: The outer wall of the end of the mold core body (10) has a section with a smooth surface.
6. The cold drawing die for a precision seamless steel pipe according to claim 1, characterized in that: The two ends of the core body (10) are in contact with the two opposite side walls of the inner cavity (3) and are slidably connected when the two ends are completely matched with the internal thread groove (1102) of the core switching disk (5).
7. The cold drawing die for a precision seamless steel pipe according to claim 1, characterized in that: The inner diameter of the annular block (1104) is smaller than the inner diameter of the annular groove (1103), and the inner wall of each annular block (1104) is fixedly connected with two protrusions (1105) symmetrically arranged with reference to the central axis of the annular block (1104) as the symmetry axis, and the protrusions (1105) extend away from the end of the annular block (1104) to the inside of the threaded groove (1102), and the threaded groove (1102) is connected to the annular groove (1103).
8. The cold drawing die for a precision seamless steel pipe according to claim 1, characterized in that: The two grooves (1106) are symmetrically arranged on both sides of the core body (10) with reference to the central axis of the core body (10) as the symmetry axis, and one end of the groove (1106) is closed, and the other end of the groove (1106) is open.