CN212384285U - Pressed mandrel - Google Patents
Pressed mandrel Download PDFInfo
- Publication number
- CN212384285U CN212384285U CN202021369037.9U CN202021369037U CN212384285U CN 212384285 U CN212384285 U CN 212384285U CN 202021369037 U CN202021369037 U CN 202021369037U CN 212384285 U CN212384285 U CN 212384285U
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- China
- Prior art keywords
- working sleeve
- connecting column
- pull rod
- sleeve
- tie rod
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- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009785 tube rolling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
本实用新型提供一种受压型芯棒，用于解决现有技术中芯棒寿命不高的问题。本实用新型提供一种受压型芯棒，包括：工作套筒，工作套筒两端均为开口结构；连接柱，所述连接柱和所述工作套筒同轴拼接，所述工作套筒的一个端部和所述连接柱的端面配合，所述工作套筒的另一端用于和限动力装置配合；拉杆，拉杆一端设有卡位头，所述拉杆另一端能够轴向穿过所述工作套筒且和所述连接柱可拆卸连接，所述卡位头卡在所述工作套筒外；所述连接柱的外径小于或者等于所述工作套筒的外径，卡位头的外径小于或者等于所述卡位头的外径。使得工作套筒在成型时受压，拉杆受拉，两者都是单一施力方向，工作套筒受压是不易产生裂缝的，使得工作套筒的使用寿命提高。
The utility model provides a pressure-type mandrel, which is used to solve the problem of low service life of the mandrel in the prior art. The utility model provides a pressure-type mandrel, comprising: a working sleeve, both ends of which are open structures; a connecting column, the connecting column and the working sleeve are coaxially spliced, and the working sleeve One end of the pull rod is matched with the end face of the connecting column, and the other end of the working sleeve is used to cooperate with the power limiting device; the pull rod, one end of the pull rod is provided with a clamping head, and the other end of the pull rod can axially pass through the The working sleeve is detachably connected to the connecting column, and the locking head is stuck outside the working sleeve; the outer diameter of the connecting column is smaller than or equal to the outer diameter of the working sleeve, and the locking head is The outer diameter is smaller than or equal to the outer diameter of the clamping head. The working sleeve is compressed during forming and the tie rod is pulled, both of which are in a single direction of force, and the working sleeve is not prone to cracks when it is compressed, so that the service life of the working sleeve is increased.
Description
Technical Field
The utility model relates to a seamless steel pipe manufacturing technical field especially relates to a core stick is pressed.
Background
In the production of seamless steel pipes, a mandrel is usually used as an inner deformation tool, and a roller used as an outer deformation tool is matched to perform reducing and wall-reducing rolling on a hollow pipe blank, so that a qualified seamless steel pipe material meeting the standard requirement is obtained.
The mandrel is usually in a retained rolling state in work, namely, the mandrel moves according to a process rule and a speed curve specified by the process rule under the constraint of a retaining device no matter how the rolling speed of the roller changes in the rolling process.
The mandrel of the present mandrel construction is a rigid hollow or solid rod-shaped tool obtained by welding, screwing or other joining type of solid body or bodies. And in the working process, the mandrel limiting power mechanism applies limiting power to the mandrel so as to obtain the preset rolling speed of the mandrel. The existing core rod structure enables the core rod to be in a tensile state in the axial direction under the action of limited power, when the core rod is located in a deformation zone and is still subjected to combined action of radial rolling force, the surface of the core rod can generate large tensile stress, and when the core rod leaves the deformation zone, the core rod is only subjected to the action of limited power, and the tensile stress on the surface of the core rod is greatly reduced. Therefore, the core rod is repeatedly subjected to great alternating tensile stress in the working process, so that the surface of the core rod is subjected to ring cracks and cracks, and the core rod is failed and discarded. This is more pronounced for a multi-roll pipe mill than for a two-roll pipe mill.
At present, due to the influence of the inherent stress state of a core rod structure, the service life of the core rod is not high generally, and particularly, the multi-roller tube rolling mill represented by a three-roller retained continuous tube rolling mill is remarkable. Thus, the tool cost of the tube rolling process is increased.
Disclosure of Invention
In view of the above shortcomings of the prior art, an object of the present invention is to provide a pressurized mandrel for solving the problem of the prior art that the life of the mandrel is not high.
To achieve the above and other related objects, the present invention provides a pressurized core rod, comprising:
the two ends of the working sleeve are both of an opening structure;
the connecting column is coaxially spliced with the working sleeve, one end part of the working sleeve is matched with the end surface of the connecting column, and the other end of the working sleeve is used for being matched with the power limiting device;
one end of the pull rod is provided with a clamping head, the other end of the pull rod can axially penetrate through the working sleeve and is detachably connected with the connecting column, and the clamping head is clamped outside the working sleeve;
the outer diameter of the connecting column is smaller than or equal to that of the working sleeve, and the outer diameter of the clamping head is smaller than or equal to that of the clamping head.
Optionally, the strength of the working sleeve is greater than the strength of the tie rod at a temperature of 1000 to 1300 degrees.
Optionally, a gap is provided between the inner wall of the working sleeve and the outer circumferential surface of the pull rod.
Optionally, the pull rod is provided with at least two annular protrusions, and two ends of the working sleeve are respectively sleeved on the annular protrusions to form the gap.
Optionally, the pull rod is sleeved with at least two support rings, and two ends of the working sleeve are respectively sleeved on the support rings to form the gap;
the support ring carries out axial spacing through the screens groove, the screens groove sets up work sleeve inner wall or setting are on the pull rod outer peripheral face.
Optionally, one end of the pull rod is provided with a circumferential protrusion, the other end of the pull rod is sleeved with a support ring, and two ends of the working sleeve are respectively sleeved on the circumferential protrusion and the support ring to form the gap.
Optionally, the pull rod and the connecting column are matched through a columnar thread structure.
Optionally, the pull rod and the connecting column are matched through a tapered thread structure.
Optionally, an axial center hole is formed in one end, matched with the connecting column, of the pull rod.
Optionally, the clamping head has a conical structure.
As mentioned above, the utility model discloses a pressurized core stick has following beneficial effect at least:
through dividing into a plurality of parts with the plug, wherein the working sleeve plays actual shaping effect to rolling in-process, simultaneously through the pull rod cooperation for the working sleeve is pressurized when the shaping, and the pull rod is drawn, and both are single application of force direction, and the working sleeve pressurized is difficult for producing the fissured, has changed traditional plug both to be drawn the state also has the pressurized state, makes the working sleeve's life improve, thereby reaches and reduces change and maintenance frequency, has the effect of practicing thrift the cost.
Drawings
Fig. 1 shows a schematic view of a pressed mandrel according to the present invention.
Element number description: the structure comprises a working sleeve 1, a connecting column 2, a tool withdrawal groove 21, a pull rod 3, a clamping head 31, a circumferential bulge 32, a support ring 33, an axial center hole 34, a gap 4 and a tapered thread structure 5.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1. It should be understood that the structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention does not have the essential significance in the technology, and any modification of the structure, change of the ratio relationship or adjustment of the size should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that can be achieved. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.
Referring to fig. 1, the present invention provides an embodiment of a pressed mandrel, including: the device comprises a working sleeve 1, a connecting column 2 and a pull rod 3, wherein both ends of the working sleeve 1 are of an open structure; the connecting column 2 and the working sleeve 1 are coaxially spliced, one end part of the working sleeve 1 is matched with the end surface of the connecting column 2, and the other end of the working sleeve 1 is used for being matched with a power limiting device; the limiting power device is the prior art, the purpose of the limiting power device is to control the motion state of the mandrel, one end of the pull rod 3 is provided with a clamping head 31, the other end of the pull rod 3 can axially penetrate through the working sleeve 1 and is detachably connected with the connecting column 2, and the clamping head 31 is clamped outside the working sleeve 1; the outer diameter of the connecting column 2 is smaller than or equal to the outer diameter of the working sleeve 1, and the outer diameter of the clamping head 31 is smaller than or equal to the outer diameter of the clamping head 31. Through dividing into a plurality of parts with the plug, wherein work sleeve 1 plays actual shaping effect to rolling in-process, simultaneously through pull rod 3 cooperation for work sleeve 1 is the pressurized when shaping, and pull rod 3 is drawn, and both are single application of force direction, and work sleeve 1 pressurized is difficult for producing the fracture, has changed traditional plug existing state that is drawn and also has the pressurized state, makes work sleeve 1's life improve, thereby reaches and reduces change and maintenance frequency, has the effect of saving cost. Wherein, the pull rod 3 and the connecting column 2 can be detachably connected, so that the replacement of the working sleeve 1 is facilitated, when the working sleeve 1 is damaged, the working sleeve 1 can be only replaced, the pull rod 3 and the connecting column 2 do not need to be replaced, and the cost is further saved.
In this embodiment, referring to fig. 1, at a temperature of 1000 to 1300 ℃, the strength of the working sleeve 1 is greater than that of the pull rod 3. The high temperature resistance of the working sleeve 1 is larger than that of the pull rod 3, the pull rod 3 can be made of steel with lower cost, and due to the working sleeve 1, the temperature of the pull rod 3 is lower than that of the working sleeve 1, so that the requirement on the pull rod 3 is reduced, and the purpose of saving cost is achieved.
In this embodiment, referring to fig. 1, a space 4 is provided between the inner wall of the working sleeve 1 and the outer circumferential surface of the pull rod 3. Through the setting of interval 4 for work sleeve 1 can be in this interval 4 internal micro-deformation when receiving radial force, thereby reduces the radial extrusion to pull rod 3, and interval 4 sets up simultaneously can reduce heat-conduction.
In this embodiment, at least two annular protrusions 32 are arranged on the pull rod 3, and the two ends of the working sleeve 1 are respectively sleeved on the annular protrusions 32 to form the gap 4. Namely, the two ends of the working sleeve 1 are supported, and when the actual seamless steel pipe is formed, the position with higher temperature is in the middle position of the working sleeve 1, and the reliability of the structure can be ensured through the support for the two ends of the working sleeve 1.
In this embodiment, the pull rod 3 is sleeved with at least two support rings 33, and two ends of the working sleeve 1 are respectively sleeved on the support rings 33 to form the gap 4; the support ring 33 is axially limited through a clamping groove which is arranged on the inner wall of the working sleeve 1 or on the outer peripheral surface of the pull rod 3. Namely, the two ends of the working sleeve 1 are supported, and when the actual seamless steel pipe is formed, the position with higher temperature is in the middle position of the working sleeve 1, and the reliability of the structure can be ensured through the support for the two ends of the working sleeve 1.
In this embodiment, referring to fig. 1, one end of the pull rod 3 is provided with a circumferential protrusion 32, the other end of the pull rod 3 is sleeved with a support ring 33, and two ends of the working sleeve 1 are respectively sleeved on the circumferential protrusion 32 and the support ring 33 to form the gap 4. Namely, the two ends of the working sleeve 1 are supported, and when the actual seamless steel pipe is formed, the position with higher temperature is in the middle position of the working sleeve 1, and the reliability of the structure can be ensured through the support for the two ends of the working sleeve 1.
In this embodiment, the pull rod 3 and the connecting column 2 are matched through a columnar thread structure.
In this embodiment, referring to fig. 1, the pull rod 3 and the connecting column 2 are matched through a tapered thread structure 5. The tapered threads can bear larger extrusion force, and in fig. 1, the tool withdrawal groove 21 is arranged at the bottom of the tapered hole on the connecting column 2, so that the tapered hole of the connecting column 2 can be conveniently processed.
In this embodiment, referring to fig. 1, an axial center hole 34 is formed at one end of the pull rod 3 and the connecting column 2. The design of the axial center hole 34 can enable the pull rod 3 to realize balanced stress on each thread through deformation when receiving extrusion force, and avoid the thread damage caused by the thread precision problem from influencing the heights of the pull rod 3 and the connecting column 2.
In this embodiment, referring to fig. 1, the position-retaining head 31 has a tapered structure. The tapered structure prevents interference between the head and the seamless steel tube during the forming process.
To sum up, the utility model discloses a divide into a plurality of parts with the plug, wherein work sleeve 1 plays actual shaping effect to rolling in-process, cooperate through pull rod 3 simultaneously for work sleeve 1 pressurized when the shaping, pull rod 3 is drawn, and both are single application of force direction, and work sleeve 1 pressurized is difficult for producing fissured, has changed the state that traditional plug had both been drawn and has also had the pressurized state, makes work sleeve 1's life improve, thereby reaches and reduces change and maintenance frequency, has the effect of saving cost.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021369037.9U CN212384285U (en) | 2020-07-13 | 2020-07-13 | Pressed mandrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021369037.9U CN212384285U (en) | 2020-07-13 | 2020-07-13 | Pressed mandrel |
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| Publication Number | Publication Date |
|---|---|
| CN212384285U true CN212384285U (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021369037.9U Active CN212384285U (en) | 2020-07-13 | 2020-07-13 | Pressed mandrel |
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| Country | Link |
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| CN (1) | CN212384285U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111760913A (en) * | 2020-07-13 | 2020-10-13 | 中冶赛迪工程技术股份有限公司 | Pressed mandrel |
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- 2020-07-13 CN CN202021369037.9U patent/CN212384285U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111760913A (en) * | 2020-07-13 | 2020-10-13 | 中冶赛迪工程技术股份有限公司 | Pressed mandrel |
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