CN201253668Y - Internal die for internal thread steel pipe - Google Patents
Internal die for internal thread steel pipe Download PDFInfo
- Publication number
- CN201253668Y CN201253668Y CNU2008200389791U CN200820038979U CN201253668Y CN 201253668 Y CN201253668 Y CN 201253668Y CN U2008200389791 U CNU2008200389791 U CN U2008200389791U CN 200820038979 U CN200820038979 U CN 200820038979U CN 201253668 Y CN201253668 Y CN 201253668Y
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- Prior art keywords
- internal
- steel pipe
- internal mold
- thread
- sizing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model relates to an internal mold for an internal thread steel tube, which comprises an internal mold, wherein one end of the internal mold is provided with threads (5). The internal mold for an internal thread steel tube is characterized in that the other end of the internal mold is sequentially provided with a back taper portion (1), a sizing portion (2), a taper portion (3) and a changeover portion (4), wherein the taper portion (3) is positioned between the sizing portion (2) and the changeover portion (4); and thread sockets (6) are distributed on the taper portion (3) and the sizing portion (2). Because the internal mold is provided with the taper portion, the utility model can obviously shorten the length of the deformation zone of the internal mold, and the length is basically reduced half. Therefore, the utility model has obvious improvement action for the incoordination of lead. Thereby, the satisfactory shape of the stress side of internal threads of a steel tube can be obtained.
Description
Technical field
The utility model relates to the inner thread steel pipe production field, specifically, relates to a kind of inner thread steel pipe internal mold.
Background technology
Inner thread steel pipe is to be applied to the material on the water-cooling wall in the super critical boiler at present, mainly plays heat exchange, has screw thread at the steel pipe inwall, can play the effect that improves rate of heat exchange.
This screw thread is by the moulding of cold-drawn mode.In Cold Drawing Process, use the internal mold that has thread groove, in forming process, shrink steel pipe, metal is pressed in the groove of internal mold, form screw thread at steel pipe internal-surface by external mold.
Internal mold of the prior art is a cylinder, because the cross-sectional area of steel pipe is diminishing from the porch to the exit direction in process of tube plug drawing mill, the inevitable generation in the vertical extended, the longitudinal size that is steel pipe increases gradually, helical pitch inconsistent that also must cause the screw thread that forms at the deformed region steel pipe internal-surface, the porch is short, the outlet director, and the helical pitch of internal mold is constant, this causes in the cross-section variation zone of steel pipe, mismatching of the internal thread of steel pipe and internal mold screw thread produces longitudinal sliding motion on internal mold and side that steel pipe contacts, longitudinal sliding motion then causes the destruction of the internal thread side edge shape of the steel pipe produced.
Summary of the invention
The purpose of this utility model provides a kind of inner thread steel pipe internal mold that can improve steel pipe internal thread side edge shape.
The technical scheme that realizes above-mentioned purpose is: a kind of inner thread steel pipe internal mold, comprise that an end has the interior die body of screw thread, the other end of interior die body is followed successively by inverted cone segment, sizing section, conical section and changeover portion, conical section and is distributed with thread groove on conical section and the sizing section between sizing section and changeover portion.
After adopting technique scheme, inverted cone segment shields, damage product in the time of can avoiding the product depanning.Sizing section plays the setting effect, and this moment, die size was consistent with product size, made product approval.Conical section plays metamorphosis, owing to adopt taper, can shorten asynchronous region length.Changeover portion works to connect mould active section and screw section.Thread segment plays a part this mould is fixed on the base.Thread groove is distributed in taper and sizing section, and in deformation process, the steel pipe metal is pressed into this groove and forms internal thread at steel pipe internal-surface.When outer diameter of steel pipes was constant, its helical pitch also was constant, and mismatching of the internal thread of steel pipe and internal mold screw thread mainly concentrates on the internal mold deformed area, and this deformed area is long more, and then the adverse effect of Chan Shenging is also big more.Use the taper internal mold can obviously shorten this asynchronous region length, can reduce half basically, therefore mismatching of helical pitch improved significantly, thereby can obtain the shape of the satisfied stressed side of steel pipe internal thread.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the right view of Fig. 1;
Fig. 4 is A-A cross-sectional schematic of Fig. 1;
Fig. 5 is a user mode reference diagram of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
Shown in Fig. 1～4, a kind of inner thread steel pipe internal mold, comprise that an end has the interior die body of screw thread 5, the other end of interior die body is followed successively by inverted cone segment 1, sizing section 2, conical section 3 and changeover portion 4, conical section 3 and is distributed with thread groove 6 on conical section 3 and the sizing section 2 between sizing section 2 and changeover portion 4.
Operation principle of the present utility model following (as shown in Figure 5): inverted cone segment 1 shields, damage product in the time of can avoiding the product depanning.Sizing section 2 plays the setting effect, and this moment, die size was consistent with product size, made product approval.3 metamorphosis of conical section owing to adopt taper, can shorten asynchronous region length.Changeover portion 4 works to connect mould active section and thread segment.Thread segment plays a part this mould is fixed on the base.Thread groove 6 is distributed in conical section 3 and sizing section 2, and under the acting in conjunction of external mold 8 and internal mold, steel pipe 7 is pressed into this thread groove 6 and forms internal thread at steel pipe 7 inner surfaces.When steel pipe 7 external diameters were constant, its helical pitch also was constant, so mismatching of the internal thread of steel pipe 7 and internal mold screw thread mainly concentrate on the internal mold deformed area, and this deformed area is long more, and then the adverse effect of Chan Shenging is also big more.Use conical section 3 can obviously shorten this asynchronous region length, can reduce half basically, therefore mismatching of helical pitch improved significantly, thereby can obtain the shape of the satisfied stressed side of steel pipe internal thread.
Claims (1)
1, a kind of inner thread steel pipe internal mold, comprise that an end has the interior die body of screw thread (5), it is characterized in that: the other end of interior die body is followed successively by inverted cone segment (1), sizing section (2), conical section (3) and changeover portion (4), conical section (3) is positioned between sizing section (2) and the changeover portion (4), and is distributed with thread groove (6) on conical section (3) and the sizing section (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200389791U CN201253668Y (en) | 2008-08-15 | 2008-08-15 | Internal die for internal thread steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200389791U CN201253668Y (en) | 2008-08-15 | 2008-08-15 | Internal die for internal thread steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201253668Y true CN201253668Y (en) | 2009-06-10 |
Family
ID=40736983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200389791U Expired - Lifetime CN201253668Y (en) | 2008-08-15 | 2008-08-15 | Internal die for internal thread steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201253668Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107552696A (en) * | 2016-07-01 | 2018-01-09 | 常州常宝精特钢管有限公司 | Cone tank screw thread internal model |
-
2008
- 2008-08-15 CN CNU2008200389791U patent/CN201253668Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107552696A (en) * | 2016-07-01 | 2018-01-09 | 常州常宝精特钢管有限公司 | Cone tank screw thread internal model |
| CN107552696B (en) * | 2016-07-01 | 2020-07-17 | 常州常宝精特钢管有限公司 | Tapered groove thread internal mold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090610 |
|
| CX01 | Expiry of patent term |