Compression type core rod
阅读说明：本技术 受压型芯棒 (Compression type core rod ) 是由 钟剑雄 于 2020-07-13 设计创作，主要内容包括：本发明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。本发明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 invention provides a pressed core rod, which is used for solving the problem of low service life of a core rod in the prior art. The present invention provides a pressurized mandrel bar 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. The working sleeve is pressed when being formed, the pull rod is pulled, both the working sleeve and the pull rod are in a single force application direction, and cracks are not easy to generate when the working sleeve is pressed, so that the service life of the working sleeve is prolonged.)
1. 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.
2. The pressurized mandrel bar of claim 1 wherein: the strength of the working sleeve is greater than the strength of the tie rod at temperatures of 1000 to 1300 degrees.
3. The pressurized mandrel bar of claim 1 wherein: and a space is arranged between the inner wall of the working sleeve and the outer peripheral surface of the pull rod.
4. A profiled mandrel as claimed in claim 3, wherein: the pull rod is provided with at least two annular bulges, and two ends of the working sleeve are respectively sleeved on the annular bulges and form the interval.
5. A profiled mandrel as claimed in claim 3, wherein: 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 interval;
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.
6. A profiled mandrel as claimed in claim 3, wherein: 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.
7. The pressurized mandrel bar of claim 1 wherein: the pull rod is matched with the connecting column through a columnar threaded structure.
8. The pressurized mandrel bar of claim 1 wherein: the pull rod and the connecting column are matched through a conical thread structure.
9. A profiled mandrel as claimed in claim 7 or claim 8, wherein: and an axial center hole is formed in one end, matched with the connecting column, of the pull rod.
10. The pressurized mandrel bar of claim 1 wherein: the screens head conical structure.
Technical Field
The invention relates to the technical field of seamless steel pipe production and manufacturing, in particular to a pressed core rod.
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-mentioned drawbacks of the prior art, it is an object of the present invention to provide a press core rod for solving the problem of the prior art that the core rod is not long-lived.
To achieve the above and other related objects, the present invention provides a press 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 described above, the press-formed mandrel bar of the present invention has at least the following advantageous effects:
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 is a schematic view of a pressurized mandrel bar according to the present invention.
Element number description: the structure comprises a working
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so as to be understood and read by those skilled in the art, and therefore, the present disclosure is not limited to the conditions of the present disclosure, and any modifications of the structures, the changes of the ratios, or the adjustments of the sizes, should fall within the scope of the present disclosure without affecting the functions and the achievable purposes of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a 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, comprising: the device comprises a working
In this embodiment, referring to fig. 1, at a temperature of 1000 to 1300 ℃, the strength of the working
In this embodiment, referring to fig. 1, a space 4 is provided between the inner wall of the working
In this embodiment, at least two
In this embodiment, the
In this embodiment, referring to fig. 1, one end of the
In this embodiment, the
In this embodiment, referring to fig. 1, the
In this embodiment, referring to fig. 1, an axial center hole 34 is formed at one end of the
In this embodiment, referring to fig. 1, the position-retaining
In summary, the mandrel is divided into a plurality of parts, wherein the working
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can 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.