CN212190604U - A mould for finish rolling pump barrel and finish rolling pipe - Google Patents
A mould for finish rolling pump barrel and finish rolling pipe Download PDFInfo
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- CN212190604U CN212190604U CN202022573132.7U CN202022573132U CN212190604U CN 212190604 U CN212190604 U CN 212190604U CN 202022573132 U CN202022573132 U CN 202022573132U CN 212190604 U CN212190604 U CN 212190604U
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Abstract
The utility model belongs to the technical field of the steel pipe shaping technique and specifically relates to a mould that is used for finish rolling pump barrel and finish rolling pipe is related to solve the big problem that can not guarantee with the straightness accuracy of rolling steel pipe wall thickness deviation that exists among the prior art. This a mould for finish rolling pump cylinder and finish rolling pipe includes: an inner mold; the inner die comprises a guide cone and a fixed-diameter part, and the diameter of the guide cone is gradually reduced from the fixed-diameter part to the direction far away from the fixed-diameter part; the constant-diameter parts have the same diameter along the length direction of the constant-diameter parts; the roller groove is formed in the outer die, and the roller groove is provided with a return cone section, a feeding section, a reducing section and a sizing section which are connected in an annular mode. The utility model provides a technical scheme makes the straightness accuracy of rolling steel pipe obtain effective assurance, makes the wall thickness deviation remain throughout the within range of compliance again simultaneously, has improved the quality of finish rolling pump barrel and finish rolling pipe greatly.
Description
Technical Field
The utility model belongs to the technical field of the steel pipe shaping technique and specifically relates to a mould that is used for finish rolling pump barrel and finish rolling pipe is related to.
Background
The finish rolled pipe is one of seamless steel pipe products with higher grades, and has the characteristics of high precision and surface finish. The finish-rolled steel pipe is widely applied to the fields of automobiles, motorcycles, electric vehicles, petrifaction, electric power, ships, aerospace, bearings, pneumatic elements, medium and low pressure boilers and the like.
Most domestic manufacturers adopt a production process of cogging by a two-roll cold rolling mill and finish rolling by a three-roll cold rolling mill. The process has the characteristics of high production efficiency, but has the problems of large wall thickness deviation, incapability of ensuring straightness and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a mould for finish rolling pump barrel and finish rolling pipe to solve the big problem that can not guarantee with the straightness accuracy of rolling steel pipe wall thickness deviation that exists among the prior art.
In order to solve the technical problem, the utility model provides a technical scheme lies in:
a mold for finish rolling a cylinder and a finish rolling pipe, comprising: an inner mold;
the inner die comprises a guide cone and a fixed-diameter part, and the diameter of the guide cone is gradually reduced from the fixed-diameter part to the direction far away from the fixed-diameter part;
the constant-diameter parts have the same diameter along the length direction of the constant-diameter parts;
the roller groove is formed in the outer die, and the roller groove is provided with a return cone section, a feeding section, a reducing section and a sizing section which are connected in an annular mode.
Further, in the present invention,
the length of the fixed-diameter part accounts for at least 90% of the length of the inner die.
Further, in the present invention,
the inner mold further comprises a linear portion;
the guide cone is connected to the fixed diameter part and the linear part, and the linear part has the same diameter along the length direction and the diameter of the linear part is smaller than that of the fixed diameter part.
Further, in the present invention,
the length of the sizing section accounts for at least 10% of the annular length of the roll groove.
Further, in the present invention,
the diameter of the sizing section is constant;
the diameter of the reducing section is gradually increased from the sizing section to the feeding section;
the diameter of the feeding section is gradually increased from the reducing section to the direction of the back taper section, and the diameter change rate of the feeding section is greater than that of the reducing section;
the diameter of the backward conical section is gradually reduced from the feeding section to the direction of the sizing section until the diameter of the backward conical section is the same as that of the sizing section.
Further, in the present invention,
the outer die comprises an upper roller and a lower roller which are arranged on two sides of the inner die, the upper roller is circumferentially provided with an upper roller groove, and the lower roller is circumferentially provided with a lower roller groove.
Further, in the present invention,
the upper roller groove and the lower roller groove jointly form a channel for rolling the steel pipe when rotating, and the cross section of the channel is round.
Further, in the present invention,
the inner die is fixedly arranged on the inner die frame, the upper roller and the lower roller are rotatably connected to the roller frame, and the roller frame reciprocates relative to the inner die frame when the steel pipe is rolled.
Further, in the present invention,
the device also comprises a rotating mechanism;
the rotating mechanism is used for enabling the steel pipe to always keep rotating in the steel pipe rolling process;
the rotating mechanism comprises a disc for fixing the steel pipe and a rotating shaft for rotating the disc.
The embodiment of the utility model provides a following beneficial effect has been brought:
because the utility model provides a mould for finish rolling pump barrel and finish rolling pipe, include: an inner mold; the inner die comprises a guide cone and a fixed-diameter part, and the diameter of the guide cone is gradually reduced from the fixed-diameter part to the direction far away from the fixed-diameter part; the constant-diameter parts have the same diameter along the length direction of the constant-diameter parts; the roller groove is formed in the outer die, and the roller groove is provided with a return cone section, a feeding section, a reducing section and a sizing section which are connected in an annular mode.
Because the reducing part is removed from the inner die, only the guide cone and the sizing part are reserved, and the diameter of the sizing part is always kept constant, the straightness of the rolled steel pipe is effectively guaranteed, the outer diameter of the finish rolling pipe is controlled under the combined action of the annular connected cone returning section, the annular connected feeding section, the annular connected reducing section and the annular connected sizing section, and meanwhile, the wall thickness deviation is always kept in the range of a compliance, so that the quality of a finish rolling pump cylinder and the quality of the finish rolling pipe are greatly improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or the related art, the drawings required to be used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an outer mold and an inner mold of a conventional mold;
fig. 2 is a schematic structural diagram of an outer mold and an inner mold of a mold for finish rolling a pump barrel and a finish rolling pipe according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an inner mold according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an external mold according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a roll groove according to an embodiment of the present invention.
Icon:
100-an inner mold; 101-a reduced diameter portion; 110-a guide cone; 120-a fixed diameter part;
130-a straight portion; 001-finish rolling the tube; 200-external mold; 2101-Upper roll groove;
2102-lower roll groove; 210-roll grooves; 211-a back taper section;
212-a feeding section; 213-reducing section; 214-sizing section.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict. Wherein, fig. 1 is a schematic structural diagram of an outer mold and an inner mold of a conventional mold; fig. 2 is a schematic structural diagram of an outer mold and an inner mold of a mold for finish rolling a pump barrel and a finish rolling pipe according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of an inner mold according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of an external mold according to an embodiment of the present invention; fig. 5 is a schematic structural diagram of a roll groove according to an embodiment of the present invention.
Example one
The finish rolled pipe is one of seamless steel pipe products with higher grades, and has the characteristics of high precision and surface finish. The finish-rolled steel pipe is widely applied to the fields of automobiles, motorcycles, electric vehicles, petrifaction, electric power, ships, aerospace, bearings, pneumatic elements, medium and low pressure boilers and the like.
Most domestic manufacturers adopt a production process of cogging by a two-roll cold rolling mill and finish rolling by a three-roll cold rolling mill. The process has the characteristics of high production efficiency, but has the problems of large wall thickness deviation, incapability of ensuring straightness and the like.
As shown in fig. 1, a conventional finish-rolled pipe 001 is mainly formed by co-controlling an inner die (mandrel) 100 and an outer die (roll) 200. The inner die 100 is generally divided into two parts, a reduced diameter part 101 and a sizing part 120, and the outer die 200 is generally composed of four parts, namely a feeding section 212, a reduced diameter section 213, a sizing section 214 and a back taper section 211. The linearity of the finish-rolled pipe 001 is poor because the proportion of the length of the reduced diameter part 101 in the inner die 100 to the total length of the inner die 100 is too large; meanwhile, the inner die 100 and the outer die 200 are respectively used for controlling the inner diameter and the outer diameter of the finish-rolled pipe 001, and the ratio of the lengths of the sizing section 120 of the inner die 100 to the sizing section 200 is too small, so that the wall thickness deviation of the finish-rolled pipe 001 is large.
In view of this, the embodiment of the present invention provides a mold for finish rolling a pump barrel and a finish rolling pipe, please refer to fig. 2 and 3, the mold comprising: an inner mold 100; the inner die 100 includes a guide cone 110 and a sizing portion 120, and the diameter of the guide cone 110 is gradually reduced from the fixed diameter portion 120 to a direction away from the fixed diameter portion 120; the constant diameter part 120 has the same diameter along its length direction; the roller-type rolling machine further comprises an outer die 200, wherein the outer die 200 is circumferentially provided with roller grooves 210, and the roller grooves 210 are provided with a reverse taper section 211, a feeding section 212, a reducing section 213 and a sizing section 214 which are annularly connected.
The embodiment of the utility model provides a following beneficial effect has been brought:
because the reducing part 101 is removed from the inner die 100, only the guide cone 110 and the sizing part 120 are reserved, and the diameter of the sizing part 120 is always kept constant, the straightness of the rolled steel pipe is effectively ensured, the annular connected cone returning section 211, the feeding section 212, the reducing section 213 and the sizing section 214 jointly act to control the outer diameter of the finish rolling pipe 001, and meanwhile, the wall thickness deviation is always kept in a compliant range, so that the quality of the finish rolling pump barrel and the finish rolling pipe is greatly improved.
The structural composition of the inner mold 100 is further described as follows:
referring to fig. 3, the inner mold 100 further includes a linear portion 130; the guide cone 110 is connected to the fixed diameter part 120 and the linear part 130, and the linear part 130 has the same diameter in the length direction thereof and a diameter smaller than that of the fixed diameter part 120.
The inner die 100 is improved to a reduced diameter portion 101 with a reduced diameter originally reduced into a straight portion 130 and a sizing portion 120 with a constant diameter, the middle of the reduced diameter portion 130 is connected and transited by a guide cone 110, the straight portion 130 has the same diameter as the end with the smallest diameter of the reduced diameter portion 101 originally, and the sizing portion 120 has the same diameter as the end with the largest diameter of the reduced diameter portion 101 originally. The inner die 100 comprises the straight line part 130 with a certain diameter and the sizing part 120, so that the straightness of the rolled steel pipe is effectively ensured, and meanwhile, the wall thickness deviation is always kept in a compliant range, and the quality of the rolled steel pipe is greatly improved.
Further, the length of the sizing portion 120 accounts for at least 90% of the length of the inner mold 100.
The length of the constant diameter part 120 is most of the total length of the inner die 100, so that the overall diameter of the inner die 100 does not change greatly, the straightness of the rolled steel pipe is further ensured, and the wall thickness deviation is reduced.
Further, the length of the gauge section 214 is at least 10% of the annular length of the roll groove 210.
Compared with the existing forming die, the increase of the length of the sizing section 214 in comparison with the annular length of the roller groove 210 greatly reduces the change of the outer diameter of the finish-rolled pipe 001, further ensures the straightness of the rolled steel pipe, and reduces the wall thickness deviation.
The structural features of the reverse taper section 211, the feeding section 212, the reducing section 213 and the sizing section 214 of the outer die 200 are specifically described as follows:
referring to fig. 5, the diameter of the sizing section 214 is constant.
The diameter of the reducing section 213 is gradually increased from the constant diameter section 214 toward the feeding section 212.
The diameter of the feeding section 212 gradually increases from the reducing section 213 toward the back-tapering section 211, and the rate of change of the diameter of the feeding section 212 is greater than that of the reducing section 213.
The diameter of the backward tapered section 211 gradually decreases from the feeding section 212 to the sizing section 214 until the diameter of the backward tapered section is the same as that of the sizing section 214.
It should be further noted that, referring to fig. 2, the outer mold 200 includes an upper roller and a lower roller disposed at two sides of the inner mold 100, the upper roller is circumferentially provided with an upper roller groove 2101, and the lower roller is circumferentially provided with a lower roller groove 2102.
The upper roller and the lower roller roll the formed steel tube together to form, and the upper roller groove 2101 and the lower roller groove 2102 co-act to control the outer diameter of the finish-rolled tube 001.
Further, the upper roll groove 2101 and the lower roll groove 2102 together form a passage for rolling the steel pipe while rotating, and the passage has a circular sectional shape.
In an alternative to this embodiment, it is preferable that,
the inner die 100 is fixedly arranged on the inner die frame, the upper roller and the lower roller are rotatably connected to the roller frame, and the roller frame reciprocates relative to the inner die frame when rolling the steel pipe.
The upper roller and the lower roller reciprocate relative to the inner die frame when rolling the steel pipe, so that the wall thickness of each position on the surface of the rolled steel pipe is uniform, and the requirement of wall thickness deviation is met.
It should be further explained that the finish rolling pipe mold further comprises a rotating mechanism.
Specifically, the rotating mechanism includes a disk for fixing the steel pipe and a rotating shaft for rotating the disk.
The rotating mechanism is used for enabling the steel pipe to always rotate in the steel pipe rolling process, and is convenient for rolling and forming.
Through actual measurement and calculation, the precision of the inner diameter and the outer diameter of the finish rolling pipe 001 rolled by the die can be controlled within the range of +/-0.05 mm, the wall thickness deviation of a product is less than or equal to 0.35mm, the straightness is less than or equal to 0.1mm/m, and the quality of the finish rolling pipe 001 is greatly improved.
In general, stainless steel pipes and brass pipes are particularly prone to sticking after rolling due to their low hardness. The improvement of the die matching lubricating oil for the finish rolling pump barrel and the finish rolling pipe can effectively avoid the die sticking phenomenon.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. A mould for finish rolling pump barrel and finish rolling pipe, its characterized in that includes: an inner mold;
the inner die comprises a guide cone and a fixed-diameter part, and the diameter of the guide cone is gradually reduced from the fixed-diameter part to the direction far away from the fixed-diameter part;
the constant-diameter parts have the same diameter along the length direction of the constant-diameter parts;
the roller groove is formed in the outer die, and the roller groove is provided with a return cone section, a feeding section, a reducing section and a sizing section which are connected in an annular mode.
2. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 1,
the length of the fixed-diameter part accounts for at least 90% of the length of the inner die.
3. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 1,
the inner mold further comprises a linear portion;
the guide cone is connected to the fixed diameter part and the linear part, and the linear part has the same diameter along the length direction and the diameter of the linear part is smaller than that of the fixed diameter part.
4. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 1,
the length of the sizing section accounts for at least 10% of the annular length of the roll groove.
5. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 1,
the diameter of the sizing section is constant;
the diameter of the reducing section is gradually increased from the sizing section to the feeding section;
the diameter of the feeding section is gradually increased from the reducing section to the direction of the back taper section, and the diameter change rate of the feeding section is greater than that of the reducing section;
the diameter of the backward conical section is gradually reduced from the feeding section to the direction of the sizing section until the diameter of the backward conical section is the same as that of the sizing section.
6. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 1,
the outer die comprises an upper roller and a lower roller which are arranged on two sides of the inner die, the upper roller is circumferentially provided with an upper roller groove, and the lower roller is circumferentially provided with a lower roller groove.
7. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 6,
the upper roller groove and the lower roller groove jointly form a channel for rolling the steel pipe when rotating, and the cross section of the channel is round.
8. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 7,
the inner die is fixedly arranged on the inner die frame, the upper roller and the lower roller are rotatably connected to the roller frame, and the roller frame reciprocates relative to the inner die frame when the steel pipe is rolled.
9. The finish rolling cylinder and finish rolling pipe mold as claimed in claim 1,
the device also comprises a rotating mechanism;
the rotating mechanism is used for enabling the steel pipe to always keep rotating in the steel pipe rolling process;
the rotating mechanism comprises a disc for fixing the steel pipe and a rotating shaft for rotating the disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022573132.7U CN212190604U (en) | 2020-11-10 | 2020-11-10 | A mould for finish rolling pump barrel and finish rolling pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022573132.7U CN212190604U (en) | 2020-11-10 | 2020-11-10 | A mould for finish rolling pump barrel and finish rolling pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212190604U true CN212190604U (en) | 2020-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022573132.7U Active CN212190604U (en) | 2020-11-10 | 2020-11-10 | A mould for finish rolling pump barrel and finish rolling pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212190604U (en) |
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2020
- 2020-11-10 CN CN202022573132.7U patent/CN212190604U/en active Active
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