CN111346999A - Preparation method of piston tube - Google Patents
Preparation method of piston tube Download PDFInfo
- Publication number
- CN111346999A CN111346999A CN202010211515.1A CN202010211515A CN111346999A CN 111346999 A CN111346999 A CN 111346999A CN 202010211515 A CN202010211515 A CN 202010211515A CN 111346999 A CN111346999 A CN 111346999A
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- pipe body
- thickening
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- die
- tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
Abstract
The invention discloses a preparation method of a piston tube, which comprises the following steps: preparing a clean pipe body according to the design size, wherein the pipe body is used for preparing a piston pipe; flaring one end of the pipe body; bending and flattening the conical section at the flaring opening of the pipe body; the flaring section of the pipe body is thickened to enable the wall thickness of the flaring section of the pipe body to reach the design thickness; and (3) carrying out annular groove treatment on the flared section of the thickened pipe body by adopting machining equipment, wherein an annular groove which is coaxial with the pipe body and has a central shaft is arranged on the flared section of the thickened pipe body, and the annular groove is used for placing a piston ring. According to the technical scheme, the threaded connection technology of the tube body and the piston head of the traditional piston tube is abandoned, the production process of the piston tube is simplified, the production process of a single product is greatly reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of piston tubes, in particular to a preparation method of a piston tube.
Background
The piston tube comprises a tube body and a piston head arranged on the tube body, and the traditional production process mainly adopts a threaded connection technology, namely the piston head adopts a cylindrical block, the cylindrical block is provided with a connecting hole which is concentric with a central shaft and axially penetrates through the cylindrical block, the connecting hole of the piston head is tapped, meanwhile, one end of the tube body connected with the piston head is also tapped, and the connecting hole of the tube body and the connecting hole of the piston head are in threaded connection; then, an annular groove which is concentric with the piston head is arranged on the arc-shaped surface of the piston head, and the annular groove is used for placing a piston ring. However, the tapping process of the threaded connection technique of the tube body of the piston tube and the piston head and the single production process of the piston head increase the production time of a single product, decreasing the production efficiency.
Disclosure of Invention
Aiming at the problems, the invention provides the preparation method of the piston tube, which simplifies the production process of the piston tube, greatly reduces the production process of a single product and improves the production efficiency.
The invention provides a preparation method of a piston tube, which comprises the following steps:
s1: preparing a clean pipe body according to the design size, wherein the pipe body is used for preparing a piston pipe;
s2: flaring one end of the pipe body;
s3: bending and flattening the conical section at the flaring opening of the pipe body;
s4: the flaring section of the pipe body is thickened to enable the wall thickness of the flaring section of the pipe body to reach the design thickness;
s5: and (3) carrying out annular groove treatment on the flared section of the thickened pipe body by adopting machining equipment, wherein an annular groove which is coaxial with the pipe body and has a central shaft is arranged on the flared section of the thickened pipe body, and the annular groove is used for placing a piston ring.
Preferably, in step S4, the thickening process includes the following sub-steps:
s41: thickening for 1 time, putting the bent pipe body into a first thickening die, and extruding and thickening the flaring section of the pipe body;
s42: repeating the step S41 n times, wherein the thickening mold corresponding to each thickening treatment is different; thickening 1 time corresponds to a first thickening die, thickening 2 times corresponds to a second thickening die, and thickening n times corresponds to an nth thickening die; n is more than or equal to 1, and after the flaring section of the pipe body is extruded, thickened and deformed for n times, the wall thickness of the flaring section of the pipe body reaches the designed thickness.
Preferably, the first thickening die comprises a fixed die, a movable die and a floating core die, the fixed die is provided with a pipe body placing cavity and a thickening hole, and the pipe body placing cavity and the thickening hole are arranged and communicated with each other in a concentric manner; the tube body placing cavity is used for placing a tube body, and the thickened hole is used for placing a flaring section of the tube body; the movable die is provided with a pressure ring, and the pressure ring and the thickened hole of the fixed die are arranged in the same central shaft and are in clearance fit; the movable mold is provided with a through hole penetrating along the moving direction, the through hole and the pressing ring share the same central axis, the through hole is positioned in the pressing ring, the floating core mold is inserted in the through hole of the movable mold, and the floating core mold is axially and movably matched with the through hole of the movable mold.
Preferably, in step S41, the bent and flattened tube body is correspondingly placed into the tube body placing cavity and the thickening hole of the fixed mold, and the movable mold and the floating core mold are driven to move towards the fixed mold, so that one end of the floating core mold firstly enters the flaring section of the tube body and abuts against the bent and flattened part of the tube body; the movable mould continues to move towards the fixed mould, the pressing ring of the movable mould enters the thickening hole of the fixed mould and extrudes the flaring section of the pipe body, the flaring section of the pipe body is subjected to metal deformation and metal flow, and finally, the annular space surrounded by the floating core mould, the pressing ring and the thickening hole of the fixed mould is filled.
Preferably, the connection relationship between the parts of the nth thickening die and the first thickening die and the connection relationship between the parts are the same; along with the increase of n, the outer diameter of the pressure ring is unchanged, the inner diameter of the pressure ring is gradually reduced, and the outer diameter of the floating core mold is gradually reduced; or along with the increase of n, the diameter of the thickened hole of the fixed die is gradually increased, the outer diameter of the pressure ring is gradually increased, the inner diameter of the pressure ring is unchanged, and the outer diameter of the floating core die is unchanged; or along with the increase of n, the diameter of the thickening hole of the fixed die is gradually increased, the outer diameter of the pressing ring is gradually increased, the inner diameter of the pressing ring is gradually reduced, and the outer diameter of the floating core die is gradually reduced.
Preferably, in step S5, a lathe is used to perform annular groove machining on the flared end of the tube body, and the outer edge and the inner bottom edge of the annular groove are rounded, where the radius of the rounding is recorded as R, and R is less than or equal to 0.3 mm.
Preferably, in step S3, the bending angle is α degrees, and the flared and thickened end of the tube body is provided with an inner hexagonal hole or an inner dodecagonal hole or an anti-skid tip hole or an inner quincunx hole which are concentric with the central axis.
Preferably, it further comprises S6: and necking one end of the far annular groove of the pipe body, and tapping internal threads on the inner wall of the necking section of the pipe body.
Preferably, in step S6, the constricted end of the tube body is flared, and then the flared section of the constricted end of the tube body is bent and flattened.
Preferably, in step S41, the amount of the extrusion thickening deformation of the flared section of the pipe body is 20% to 80%.
The invention has the following beneficial effects:
1. according to the technical scheme, the threaded connection technology of the tube body and the piston head of the traditional piston tube is abandoned, the production process of the piston tube is simplified, the production process of a single product is greatly reduced, and the production efficiency is improved.
2. The flaring section of the pipe body is thickened once or many times, so that the structural strength of the flaring section of the pipe body is improved, and meanwhile, the annular groove processing is conveniently carried out on the flaring section of the pipe body.
Drawings
FIG. 1 is a schematic diagram illustrating a flared tube structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a tapered section at an enlarged mouth of a tube body after being bent and flattened according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a flared portion of a tube body after being thickened for one time according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural view of a flared section of a tube body after secondary thickening in accordance with an embodiment of the present invention;
FIG. 5 is a schematic view of a product structure of a tube according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first thickening mold according to an embodiment of the present invention.
Reference numerals:
1-tube, 11-ring groove, 2-first thickening die, 21-stationary die, 211-upper die, 2111-upper placing cavity, 2112-upper thickening hole, 212-lower die, 2121-lower placing cavity, 2122-lower thickening hole, 213-tube placing cavity, 214-thickening hole, 22-movable die, 221-press ring, 222-through hole, 23-floating core die.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to fig. 6, the method for manufacturing a piston tube according to this embodiment includes the following steps:
s1: preparing a clean pipe body according to the design size, wherein the pipe body 1 is used for preparing a piston pipe;
s2: flaring one end of the pipe body 1; as shown in fig. 1;
s3: bending and flattening the conical section at the flaring opening of the pipe body 1; as shown in fig. 2;
s4: the flaring section of the pipe body 1 is thickened to enable the wall thickness of the flaring section of the pipe body 1 to reach the design thickness;
s5: adopt machining equipment to carry out the ring channel processing to the flaring of thickened body 1, set up a ring channel 11 with the coaxial axial center pin of body in the flaring of thickened body 1, ring channel 11 is used for placing the piston ring.
According to the technical scheme, the threaded connection technology of the pipe body and the piston head of the traditional piston pipe is abandoned, the production process of the piston pipe is simplified, the production process of a single product is greatly reduced, and the production efficiency is improved.
In step S4, the thickening process includes the following substeps:
s41: thickening for 1 time, putting the bent pipe body 1 into a first thickening die 2, and extruding and thickening the flaring section of the pipe body;
s42: repeating the step S41 n times, wherein the thickening mold corresponding to each thickening treatment is different; thickening 1 time corresponds to a first thickening die, thickening 2 times corresponds to a second thickening die, and thickening n times corresponds to an nth thickening die; n is more than or equal to 1, and after the flaring section of the pipe body is extruded, thickened and deformed for n times, the wall thickness of the flaring section of the pipe body reaches the designed thickness.
Carry out single or many times thickening processing to the flaring section of body 1 through the thickening processing preface, improved the structural strength of the flaring section of body 1, be convenient for simultaneously carry out ring channel 11 processing to the flaring section of body 1.
As shown in fig. 6, the first thickening mold 2 includes a fixed mold 21, a movable mold 22, and a floating core mold 23, the fixed mold 21 is provided with a pipe body placing cavity 213 and a thickening hole 214, and the pipe body placing cavity 213 and the thickening hole 214 are arranged concentrically and are communicated; the tube body placing cavity 213 is used for placing the tube body 1, and the thickened hole 214 is used for placing a flared section of the tube body 1; the movable die 22 is provided with a pressing ring 221, and the pressing ring 221 and the thickened hole 214 of the fixed die 21 are arranged together with the central shaft and in clearance fit; the movable die 22 is provided with a through hole 222 penetrating along the moving direction, the through hole 222 and the pressing ring 221 are concentric, the through hole 222 is located in the pressing ring 221, the hole expanding die 23 is inserted in the through hole 222 of the movable die 22, and the hole expanding die 23 is axially movably matched with the through hole 222 of the movable die 22.
Specifically, the fixed die 21 includes an upper die 211 and a lower die 212, the upper die 211 is provided with an upper thickening hole 2112 and an upper placing cavity 2111 which are communicated, the lower die 212 is provided with a lower thickening hole 2122 and a lower placing cavity 2121 which are communicated, the upper thickening hole 2112, the upper placing cavity 2111, the lower thickening hole 2122 and the lower placing cavity 2121 are all semicircular, when the upper die 211 contacts the lower die 212, the upper placing cavity 2111 and the lower placing cavity 2121 form a tube body placing cavity 213, and the upper thickening hole 2112 and the lower thickening hole 2122 form a thickening hole 214. In addition, the first thickening die 2 further comprises a rack, a first hydraulic cylinder, a second hydraulic cylinder and a third hydraulic cylinder, wherein the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder are all installed on the rack, a piston rod of the first hydraulic cylinder is connected with the movable die 22, and the second hydraulic cylinder is connected with one end, far away from the die, of the floating core die 23; the third hydraulic cylinder is positioned above the upper die 211, and a piston rod of the third hydraulic cylinder is connected with the upper die 211; lower die 212 is mounted on the frame.
Moreover, the connection relationship between the components of the nth thickening die and the first thickening die 2 and the connection relationship between the components are the same; along with the increase of n, the outer diameter of the pressure ring is unchanged, the inner diameter of the pressure ring is gradually reduced, and the outer diameter of the floating core mold is gradually reduced; or along with the increase of n, the diameter of the thickened hole of the fixed die is gradually increased, the outer diameter of the pressure ring is gradually increased, the inner diameter of the pressure ring is unchanged, and the outer diameter of the floating core die is unchanged; or along with the increase of n, the diameter of the thickening hole of the fixed die is gradually increased, the outer diameter of the pressing ring is gradually increased, the inner diameter of the pressing ring is gradually reduced, and the outer diameter of the floating core die is gradually reduced. Here, according to the required thickening dimension and the single or many times thickening of the flaring section of body, through the diameter of the thickening hole of setting for clamping ring, unsteady mandrel and cover half, proposed three kinds of schemes, all can be applied to in the actual production, provide more selectivity processing schemes for the flaring and the thickening that the body corresponds the end.
In step S41, the bent and flattened pipe body 1 is correspondingly placed into the pipe body placing cavity 213 and the thickened hole 214 of the fixed mold 21, and the movable mold 22 and the floating core mold 23 are driven to move toward the fixed mold 21, so that one end of the floating core mold 23 firstly enters the flared section of the pipe body 1 and abuts against the bent and flattened part of the pipe body 1; the movable die 22 continues to move towards the fixed die 21, the pressing ring 221 of the movable die 22 enters the thickening hole 214 of the fixed die 21 and extrudes the flared section of the tube body, the flared section of the tube body is subjected to metal deformation and metal flow, and finally, an annular space surrounded by the floating core die 23, the pressing ring 221 and the thickening hole of the fixed die 21 is filled.
In step S3, the bending angle is recorded as α degrees, and the flared thickened end of the tube body 1 is provided with an internal hexagonal hole or an internal dodecagonal hole or an anti-skid tip hole or an internal quincuncial hole having the same central axis.
In step S5, a lathe is used to perform annular groove machining on the flared end of the tube body 1, and the outer edge and the inner bottom edge of the annular groove 11 are rounded, the radius of the rounding is recorded as R, and R is less than or equal to 0.3 mm. This range of the radius is chosen, on the one hand, to facilitate the application of the piston ring and, on the other hand, to avoid the piston ring falling out of the annular groove 11.
In step S41, the amount of deformation of the flared end of the tube body 1 by extrusion and thickening is 20% to 80%. Practice shows that the single extrusion thickening deformation of the flaring section of the pipe body 1 is preferably 20-80%; when the single extrusion thickening deformation of the flaring section of the pipe body 1 is lower than 20%, the working procedures are increased, so that the production efficiency is reduced; when the single extrusion thickening deformation of the flaring section of the pipe body 1 is more than 80%, the flaring section of the pipe body is easy to crack or have other defects, so that the generation of waste products is increased. The extrusion thickening deformation of the flaring section of the pipe body is (the wall thickness of the flaring section of the pipe body after thickening-the wall thickness of the flaring section of the pipe body before thickening) or/and the wall thickness of the flaring section of the pipe body before thickening.
In addition, a method of manufacturing a piston tube further includes S6: and necking one end of the far annular groove of the pipe body 1, and tapping internal threads on the inner wall of the necking section of the pipe body. In step S6, the pipe body is flared at the constricted end, and then the flared section of the constricted end is bent and flattened. The piston tube finished product can be obtained by the processing of the processes, as shown in figure 5. The end of the far annular groove of the tube body 1 is contracted and the inner wall of the far annular groove is provided with an internal thread so as to be connected with a driving rod corresponding to the driving device.
To further understand the single or multiple thickening processes proposed by the present invention, an example is as follows:
firstly, aiming at the single thickening treatment proposed by the technical scheme; according to the requirement of the thickening size of the flaring section of the pipe body, the diameters of the pressing ring, the floating core mold and the thickening hole of the fixed mold are designed, and the bent and flattened pipe body is only required to be placed into the pipe body placing cavity and the thickening hole of the fixed mold; and then, the floating core die and the movable die work, and the flaring section of the pipe body is thickened and formed at one time.
Secondly, aiming at multiple thickening treatments provided by the technical scheme, the embodiment adopts secondary thickening treatment and needs a first thickening mould and a second thickening mould to be matched; according to the final thickening size, the inner diameter and the outer diameter of the flaring section of the pipe body, the diameters of the thickening holes of the pressing ring, the floating core mold and the fixed mold of the first thickening mold and the second thickening mold are designed; the wall thickness of the pipe body in this example is 1.2mm, the single extrusion thickening deformation amount of the flaring section of the pipe body is 50%, and after the flaring section of the pipe body is thickened by the first thickening die, the wall thickness of the flaring section of the pipe body after one thickening is 1.8mm, as shown in fig. 3; after the flaring section of the pipe body is thickened by the second thickening die, the wall thickness of the flaring section of the pipe body after secondary thickening is 2.7mm, as shown in fig. 4; and then, processing an annular groove on the outer contour of the flared section of the tube body after the secondary thickening.
It should be noted that the above preferred embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill 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; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (10)
1. The preparation method of the piston tube is characterized by comprising the following steps:
s1: preparing a clean pipe body according to the design size, wherein the pipe body is used for preparing a piston pipe;
s2: flaring one end of the pipe body;
s3: bending and flattening the conical section at the flaring opening of the pipe body;
s4: the flaring section of the pipe body is thickened to enable the wall thickness of the flaring section of the pipe body to reach the design thickness;
s5: and (3) carrying out annular groove treatment on the flared section of the thickened pipe body outer contour by adopting machining equipment, wherein an annular groove which is coaxial with the pipe body and has a central shaft is arranged on the flared section of the thickened pipe body, and the annular groove is used for placing a piston ring.
2. The method of manufacturing a piston tube of claim 1, wherein:
in step S4, the thickening process includes the following substeps:
s41: thickening for 1 time, putting the bent pipe body into a first thickening die, and extruding and thickening the flaring section of the pipe body;
s42: repeating the step S41 n times, wherein the thickening mold corresponding to each thickening treatment is different; thickening 1 time corresponds to a first thickening die, thickening 2 times corresponds to a second thickening die, and thickening n times corresponds to an nth thickening die; n is more than or equal to 1, and after the flaring section of the pipe body is extruded, thickened and deformed for n times, the wall thickness of the flaring section of the pipe body reaches the designed thickness.
3. The method of manufacturing a piston tube of claim 2, wherein:
the first thickening die comprises a fixed die, a movable die and a floating core die, the fixed die is provided with a pipe body placing cavity and a thickening hole, and the pipe body placing cavity and the thickening hole are arranged and communicated with each other in a concentric manner; the tube body placing cavity is used for placing a tube body, and the thickened hole is used for placing a flaring section of the tube body; the movable die is provided with a pressure ring, and the pressure ring and the thickened hole of the fixed die are arranged in the same central shaft and are in clearance fit; the movable mold is provided with a through hole penetrating along the moving direction, the through hole and the pressing ring share the same central axis, the through hole is positioned in the pressing ring, the floating core mold is inserted in the through hole of the movable mold, and the floating core mold is axially and movably matched with the through hole of the movable mold.
4. The method of manufacturing a piston tube of claim 3, wherein:
in step S41, the bent and flattened tube body is correspondingly placed into the tube body placing cavity and the thickened hole of the fixed mold, and the movable mold and the floating core mold are driven to move towards the fixed mold, so that one end of the floating core mold firstly enters the flaring section of the tube body and abuts against the bent and flattened part of the tube body; the movable mould continues to move towards the fixed mould, the pressing ring of the movable mould enters the thickening hole of the fixed mould and extrudes the flaring section of the pipe body, the flaring section of the pipe body is subjected to metal deformation and metal flow, and finally, the annular space surrounded by the floating core mould, the pressing ring and the thickening hole of the fixed mould is filled.
5. The method of manufacturing a piston tube according to claim 3 or 4, wherein:
the connection relation between the components of the nth thickening die and the first thickening die and the connection relation between the components are the same; along with the increase of n, the outer diameter of the pressure ring is unchanged, the inner diameter of the pressure ring is gradually reduced, and the outer diameter of the floating core mold is gradually reduced; or along with the increase of n, the diameter of the thickened hole of the fixed die is gradually increased, the outer diameter of the pressure ring is gradually increased, the inner diameter of the pressure ring is unchanged, and the outer diameter of the floating core die is unchanged; or along with the increase of n, the diameter of the thickening hole of the fixed die is gradually increased, the outer diameter of the pressing ring is gradually increased, the inner diameter of the pressing ring is gradually reduced, and the outer diameter of the floating core die is gradually reduced.
6. The method of manufacturing a piston tube of claim 1, wherein:
in step S5, a lathe is used to process the annular groove on the flared section of the outer contour of the tube body, and the outer edge and the inner bottom edge of the annular groove are rounded, the radius of the rounding is recorded as R, and R is less than or equal to 0.3 mm.
7. The method of manufacturing a piston tube of claim 1, wherein:
in step S3, the bending angle is α degrees, and the thickened end of the flared end of the pipe body is provided with an inner hexagonal hole or an inner dodecagonal hole or an anti-skid tip hole or an inner quincuncial hole which are concentric with the central axis.
8. The method of manufacturing a piston tube of claim 1, wherein:
further comprising S6: and carrying out internal thread tapping on one end of the far annular groove of the pipe body.
9. The method of manufacturing a piston tube of claim 8, wherein:
in step S6, necking the end of the distal annular groove of the tube body, and tapping the inner wall of the necking section of the tube body; and flaring the necking end of the pipe body, and then bending and flattening the flaring section of the necking end of the pipe body.
10. The method of manufacturing a piston tube of claim 2, wherein:
in step S41, the amount of deformation of the flared section of the pipe body by extrusion and thickening is 20-80%.
Priority Applications (1)
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|---|---|---|---|
| CN202010211515.1A CN111346999A (en) | 2020-03-24 | 2020-03-24 | Preparation method of piston tube |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010211515.1A CN111346999A (en) | 2020-03-24 | 2020-03-24 | Preparation method of piston tube |
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| CN114833286A (en) * | 2022-04-27 | 2022-08-02 | 太原理工大学 | Flaring-upsetting composite forming device and method for end flange of thin-walled pipe |
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| CN114833286B (en) * | 2022-04-27 | 2024-04-30 | 太原理工大学 | Flaring-upsetting composite forming device and method for thin-wall pipe end flange |
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Application publication date: 20200630 |