CN102632136B - Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section - Google Patents
Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section Download PDFInfo
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- CN102632136B CN102632136B CN201210094967.1A CN201210094967A CN102632136B CN 102632136 B CN102632136 B CN 102632136B CN 201210094967 A CN201210094967 A CN 201210094967A CN 102632136 B CN102632136 B CN 102632136B
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Abstract
The invention discloses a method for preparing a tube blank by means of differential temperature pushing from an equal circular cross section to a variable square cross section. The method includes the steps: 1) heating a cylindrical section; 2) pushing a transitional section; 3) pushing the variable square cross section by turning on a linear heating device, keeping the temperature of a flange of the tube blank range from 350 DEG C to 400 DEG C, pushing the tube blank at the speed of 25-30mm/s until forming and then unloading; and 4) turning off an annular heating device and the linear heating device and performing ejection. A device for preparing the tube blank by means of differential temperature pushing from the equal circular cross section to the variable square cross section comprises a heating sleeve, the annular heating device and the linear heating device, wherein the heating sleeve is arranged outside the cylindrical section in a surrounding manner, the annular heating device is arranged on the outer side of the transitional section in a surrounding manner, and the linear heating device extends along a filleted flange of the variable square cross section. By the aid of the method, the tube blank can simultaneously have fine plastic deformation at the flange and better tensile strength on a tension side of a mould, cracking or thinning of the tube blank during pushing can be assuredly avoided, and the quality of the tube blank is improved.
Description
Technical field
The present invention relates to a kind of base preparation method and device, differential temperature pushing preparation cylinder blank technology and the device of the Dao Bian square-section, circular section such as it is a kind of that concrete is.
Background technology
As shown in Figure 1, for adopt that method for push manufactures from an axial base that waits Dao Bian square-section, circular section, this base appearance and size is larger, belongs to large-scale change square section thin wall shell.The maximum limit of the change square-section of this base is 1000mm, and the minimum diameter at circular cross-section place is only 300mm, and whole height is about 1250mm.This base, from short transverse, can be divided into three parts, and first is circular cross-section, and third part is for becoming square-section, and second portion is circular cross-section and becomes the transition stage between square-section.The blank of making this base is that middle circle bore dia is the hollow cylinder blank that 300mm, wall thickness are 100mm.
After process used is blanking at present, blank is applied to pushing force, and be shaped on forcing press, it is moved axially along mould, the cavity shape that generation and die shape match, from circular cross-section to the inner-cavity structure that becomes square-section.In existing pushing technical process, when blank forms bead through die corner, there is larger plastic deformation, bear larger tension with the blank at place, mould side, therefore, the drawback of existing pushing technique maximum is the structure property heterogeneity of gained cylinder base workpiece: at the relative homogeneous of barrel position formation tissue performance, flaunching part is prone to the phenomenon of crackle or attenuation, the probability that this phenomenon occurs when the wall thickness of workpiece is relatively thin is very large, because caused the obstruction in actual production.
Given this, the present invention is intended to explore differential temperature pushing preparation cylinder blank technology and the device of the Dao Bian square-section, circular section such as a kind of, this base temperature difference pushing preparation method can guarantee that a base has good plastic deformation at die corner place, and there is good tensile strength at place, mould side, guarantee that cylinder base there will not be the phenomenon of crackle or attenuation in pushing manufacturing process, improves the quality of cylinder base.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of differential temperature pushing preparation cylinder blank technology that waits Dao Bian square-section, circular section and for the device of this base differential temperature pushing preparation method's a differential temperature pushing preparation base, this base differential temperature pushing preparation method can make a base when becoming square-section section pushing distortion, make a base at flange place, there is good plastic deformation simultaneously and there is better tensile strength at place, die drawn side, and guarantee that cylinder base there will not be the phenomenon of crackle or attenuation in pushing manufacturing process, improves the quality of cylinder base.
Realize above-mentioned technical purpose, first the present invention has proposed a differential temperature pushing preparation cylinder blank technology for the Dao Bian square-section, circular section such as a kind of, comprises the steps:
1) cylindrical segment heating: after the cylinder base of hollow cylinder is sleeved on the cylindrical segment that pushes mould, open heating jacket, cylinder base is heated to 350 ± 10 ℃, and is incubated after 6 ~ 8s, close heating jacket;
2) changeover portion pushing: load, to the changeover portion that pushes mould, open ring shaped heating mechanism with the speed pushing cylinder base of 40 ~ 45mm/s simultaneously, make a base temperature remain on 350-400 ℃, complete after the pushing distortion of transition stage, stop 6 ~ 8s;
3) become square-section section pushing: open linear heating device, cylinder base flange temperature is remained on to 350-400 ℃, after with the speed of 25 ~ 30 mm/s, cylinder base being urged to and being shaped, unload;
4) close ring shaped heating mechanism and linear heating device, move back mould.
Further, in described step 3), the stretching side that adopts roller I to compress described cylinder base is pushing in the change square-section section of mould;
Further, described step 2) in, adopt roller II clamping cylinder base on the changeover portion of pushing mould;
Further, described step 2) and in step 3), to being arranged in the cooling through hole of described pushing mold center, continue to pass into the compressed air for the temperature rise of application cylinder base.
A differential temperature pushing preparation cylinder blanking device that the invention allows for the Dao Bian square-section, circular section such as a kind of, comprises pushing mould, and described pushing mould is provided with cylindrical segment, changeover portion and change square-section section; Also comprise around being arranged on heating jacket outside described cylindrical segment, around being arranged on the outer ring shaped heating mechanism of surveying of described changeover portion and extending along the fillet flange of described change square-section section the linear heating device arranging, described heating jacket, ring shaped heating mechanism and linear heating device are more than or equal to the thickness of a base to the distance of described pushing die surface.
Further, the side of described change square-section section is provided with for flattening the roller I of workpiece;
Further, described changeover portion is provided with for flattening the roller II of workpiece;
Further, the center of described pushing mould is in axial direction provided with cooling through hole;
Further, the calandria of described ring shaped heating mechanism and linear heating device is resistance wire, and the resistance wire of described ring shaped heating mechanism was around described changeover portion one week.
Beneficial effect of the present invention is:
The differential temperature pushing preparation cylinder blanking device of the Dao Bian square-section, circular section such as of the present invention is by arranging heating jacket, at changeover portion arranged outside ring shaped heating mechanism on the cylindrical segment at pushing grinding tool and becoming on the fillet flange of square-section section linear heating device is set, in cylinder base pushing forming process, after cylinder base is sleeved on cylindrical segment, with heating jacket heating, easy to operate simple again; When cylinder base is urged to changeover portion, open ring shaped heating mechanism, increase the plasticity of cylinder base, it is out of shape smoothly along pushing mould in changeover portion; When cylinder base is urged to change square-section section, open linear heating device, increase the plasticity at cylinder base flange place, it is out of shape smoothly, there will not be crackle, the stretching side of cylinder base is not heated, the tensile strength of stretching side can be effectively increased, the tension in pushing process can be effectively born;
A differential temperature pushing preparation cylinder blank technology for the Dao Bian square-section, circular section such as of the present invention is divided into three phases by pushing process, each stage adopts different heat protocol to cylinder base, when cylindrical segment pushes, after cylinder base is sleeved on cylindrical segment, again by the heating of cylinder base, for follow-up distortion is prepared; When changeover portion pushes, cylinder base starts distortion, and heating raises a base temperature, increases plasticity, due to the deformation characteristics of changeover portion, can adopt and push faster speed, obtains distortion preferably when enhancing productivity; When becoming square-section section pushing, for the flange distortion place heating of cylinder base, to increase plasticity, the stretching side of cylinder base is not heated, increase the tensile strength of cylinder base stretching side;
Therefore, the fillet flange that adopts the differential temperature pushing preparation cylinder blank technology of the Dao Bian square-section, circular section such as of the present invention can overcome cylinder base in existing cylinder base pushing process need to meet the contradiction that certain plastic deformation and stretching side must guarantee enough tensile strength, make the fillet flange of a base there is good plastic deformation, tensile side mask has better tensile strength, and guarantee that cylinder base there will not be the phenomenon of crackle or attenuation in pushing manufacturing process, improves the quality of cylinder base.
Accompanying drawing explanation
Fig. 1 is the differential temperature pushing preparation cylinder blanking device example structure schematic diagram of the Dao Bian square-sections, circular section such as the present invention;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is the B-B cutaway view of Fig. 2;
Fig. 4 is the D-D cutaway view of Fig. 2;
Fig. 5 is cylinder blank structure schematic diagram;
Fig. 6 is for adopting the cylinder base pushing equipment installation diagram of the cylinder base differential temperature pushing preparation facilities of the present embodiment;
Fig. 7 is that the pushing speed of cylinder blank technology the first embodiment and the coordinate diagram of time relationship are prepared in the differential temperature pushing of the Dao Bian square-sections, circular section such as the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
Fig. 1 is the differential temperature pushing preparation cylinder blanking device example structure schematic diagram of the Dao Bian square-sections, circular section such as the present invention; Fig. 2 is the A-A cutaway view of Fig. 1; Fig. 3 is the B-B cutaway view of Fig. 2; Fig. 4 is the D-D cutaway view of Fig. 2.
The present embodiment etc. the differential temperature pushing preparation cylinder blanking device of Dao Bian square-section, circular section, comprise pushing mould 1, described pushing mould is provided with cylindrical segment 11, changeover portion 12 and change square-section section 13, heating jacket 7 at the outer ring of cylindrical segment 11 around cylindrical segment 11, in the outside of changeover portion 12, be provided with the ring shaped heating mechanism 2 around changeover portion 12, on the fillet flange 14 that becomes square-section section 13, correspondence is provided with the linear heating device 3 extending along this fillet flange 14 respectively, ring shaped heating mechanism 2 and linear heating device 3 are more than or equal to the thickness of a base 4 to the distance on pushing mould 1 surface.The pushing mould 1 employing H13(4Cr5MoSiV1 of the present embodiment) material is made, and this material is the hot die steel of extensive use in, and operating temperature can reach 600 ℃, can bear the high temperature in a base differential temperature pushing process.Preferably, the ring shaped heating mechanism 2 of the present embodiment and the calandria of linear heating device 3 are resistance wire, described ring shaped heating mechanism 2 around described changeover portion 12 1 weeks, the resistance wire material of the present embodiment selects Cr13Al4, its operating temperature can reach 850 ℃, adopt Resistant heating not only to heat soon, and heating-up temperature is easy to control, can meets instructions for use.
In the pushing forming process of cylinder base, when cylinder base 4 forms flange through pushing mould 1 fillet flange 14, can there is larger plastic deformation, need higher forming temperature, be the critical section of a base 4; And cylinder base 4 is through pushing mould 1 sidewall sections, as the force transmission region of distortion, born very large tension, Tensile strength is had to higher requirement, need lower temperature.Therefore, in the pushing technique of existing cylinder base, exist contradiction, fillet flange 14th district that become square-section section 13 need higher temperature to guarantee the good plasticity of cylinder base 4 distortion, the sidewall region that simultaneously pushes mould 1 needs lower temperature to obtain high tensile strength, this has greatly limited the application that utilizes pushing technique to obtain high-performance cylinder base to contradiction, its basic reason is can not make deformable material have good plasticity and high tensile strength under same temperature simultaneously.
The present embodiment etc. the differential temperature pushing preparation cylinder blanking device of Dao Bian square-section, circular section by the cylindrical segment 11 arranged outside heating jackets 7 at pushing mould 1, at changeover portion 12 arranged outside ring shaped heating mechanisms with becoming on the fillet flange 14 of square-section section 13 linear heating device 3 is set, in cylinder base pushing forming process, when cylinder base 4 is urged to changeover portion 12, open ring shaped heating mechanism 2, increase the plasticity of cylinder base 4, it is out of shape smoothly at the interior edge pushing of changeover portion 12 mould 1; When cylinder base 4 is urged to change square-section section 13, open linear heating device 3, increase the plasticity at cylinder base flange place, it is out of shape smoothly, there will not be crackle, the stretching side of cylinder base is not heated, the tensile strength of stretching side can be effectively increased, the tension in pushing process can be effectively born.
As further improvement of this embodiment, the side of described change square-section section 13 is provided with for flattening the roller I 5 of workpiece, described changeover portion 12 is provided with for flattening the roller II 6 of workpiece, because the metal stock deformation area of the stretching side of cylinder base 4 is larger, even for guaranteeing tensile side facial disfigurement, in changeover portion 12 and described change square-section section 13, increase roller, while impelling like this base to be out of shape, be close to mould, prevented to a great extent the generation of sidewall region defects i.e.cracks.
As further improvement of this embodiment, the center of described pushing mould 1 is in axial direction provided with cooling through hole 8, cooling through hole 8 is set for leading to compressed air in cylinder base pushing process, take away the frictional heat between a base 4 and pushing mould 1, thereby the temperature rise of application cylinder base 4, the quality of assurance pushing forming.
As shown in Figure 6, for adopting the cylinder base pushing equipment installation diagram of the cylinder base differential temperature pushing preparation facilities of the present embodiment.The cylinder base differential temperature pushing preparation facilities of the present embodiment is placed on forcing press, the base 20 of forcing press is provided with for preventing from pushing the mold base 21 of mould 1, mold base is provided with support 22, support 22 is for supporting heating jacket 7, ring shaped heating mechanism 2 and linear heating device 3, and support roller I 5 and roller II 6, the top of forcing press is provided with for pushing the pressure seat 23 of a base 4, and under the effect of the guide rod 24 of forcing press, pressure seat 23 applies pushing force to cylinder base 4.
Below the specific embodiment of the differential temperature pushing preparation cylinder blank technology of the Dao Bian square-section, circular section such as of the present invention is elaborated.
the first embodiment
The present embodiment etc. the differential temperature pushing preparation cylinder blank technology of Dao Bian square-section, circular section, comprise the steps:
1) cylindrical segment 11 pushings: after the cylinder base 4 of hollow cylinder is sleeved on the cylindrical segment 11 that pushes mould 1, open heating jacket 7, cylinder base 4 is heated to 350 ℃, and is incubated after 6s, close heating jacket 7.Plasticity by 4 heating of cylinder base for increasing cylinder base 4, for deformation after unloading is prepared.
2) changeover portion 12 pushing: load, the changeover portion 12 with the speed pushing cylinder base 4 of 40mm/s to pushing mould 1 is opened ring shaped heating mechanism 2 simultaneously, makes a base 4 temperature remain on 350 ℃, completes after the pushing distortion of transition stage, stops 6s.As shown in Figure 6, adopt forcing press to apply pushing force to cylinder base 4, by the heat effect of ring shaped heating mechanism 2, improve or maintain the temperature of a base 4 in changeover portion 12 pushing processes, increase the plastic deformation ability of cylinder base 4, after the pushing of changeover portion 12 finishes, by being incubated the temperature of further increase or maintenance cylinder base 4, increase the plasticity of cylinder base 4, for next step the distortion of change square-section section 13 is prepared.
3) become square-section section pushing: open linear heating device 3, cylinder base flange temperature is remained on to 350 ℃, after with the speed of 25 mm/s, cylinder base 4 being urged to and being shaped, unload.By linear heating device 3 cartridge heater base flanges, increase the plastic deformation ability of cylinder base flange, and does not heat the stretching side of cylinder base 4, in pushing process, the temperature of stretching side reduces gradually, and tensile strength strengthens gradually, and along with tensile side facial disfigurement is increasing, tension demand also progressively increases, and therefore, the tensile strength of stretching side can meet a requirement for base pushing forming.
4) close ring shaped heating mechanism 2 and linear heating device 3, move back mould.
The present embodiment etc. the differential temperature pushing preparation cylinder blank technology of Dao Bian square-section, circular section pushing process is divided into three phases, each stage adopts different heat protocol to cylinder base 4, when cylindrical segment pushes, after cylinder base 4 is sleeved on cylindrical segment 11, again by the heating of cylinder base, for follow-up distortion is prepared; When changeover portion 12 pushing, because cylinder base 4 starts distortion, with 4 heating of 2 pairs of cylinder bases of ring shaped heating mechanism, increase statue, suitably adjust pushing speed, to obtain good distortion; When becoming 13 pushing of square-section section, the flange heating increase plasticity for cylinder base 4, does not heat the stretching side of cylinder base, increases the tensile strength of cylinder base 4 stretching sides, and because deflection is large, the suitable reduction of pushing speed can prevent the generation of defects i.e.cracks.
Therefore, the flange that adopts the differential temperature pushing preparation cylinder blank technology that waits Dao Bian square-section, circular section of the present embodiment can overcome a base 4 in existing cylinder base 4 pushing processes need to meet the contradiction that certain plastic deformation and stretching side must guarantee enough tensile strength, when making the fillet flange 14 of a base 4 there is good plastic deformation, stretching side also has higher tensile strength, and guarantee that cylinder base there will not be the phenomenon of crackle or attenuation in pushing manufacturing process, improves the quality of cylinder base.
Further improvement as the present embodiment technical scheme, in the pushing process of the change square-section section 13 of described step 3), the stretching side that adopts roller I 5 to compress described cylinder base 4 is pushing in the change square-section section of mould 1, described step 2), in changeover portion 12 pushing processes, adopt roller II 6 clamping cylinder bases 4 on the changeover portion of pushing mould 1.Because the metal stock deformation area of the stretching side of cylinder base 4 is larger, even for guaranteeing tensile side facial disfigurement, in changeover portion 12 and described change square-section section 13, increase roller, while impelling like this base to be out of shape, be close to mould, prevented to a great extent the generation of sidewall region defects i.e.cracks.
Further improvement as the present embodiment technical scheme, described step 2) and in step 3), to the cooling through hole 8 that is arranged on described pushing mould 1 center is interior, continue to pass into the compressed air for 4 temperature rises of application cylinder base, take away the frictional heat between a base 4 and pushing mould 1, thereby the temperature rise of application cylinder base 4, the quality of assurance pushing forming.
the second embodiment
The present embodiment etc. the differential temperature pushing preparation cylinder blank technology of Dao Bian square-section, circular section, comprise the steps:
1) cylindrical segment 11 pushings: after the cylinder base 4 of hollow cylinder is sleeved on the cylindrical segment 11 that pushes mould 1, open heating jacket 7, cylinder base 4 is heated to 340 ℃, and is incubated after 8s, close heating jacket 7.Plasticity by 4 heating of cylinder base for increasing cylinder base 4, for deformation after unloading is prepared.
2) changeover portion 12 pushing: load, the changeover portion 12 with the speed pushing cylinder base 4 of 45mm/s to pushing mould 1 is opened ring shaped heating mechanism 2 simultaneously, makes a base 4 temperature remain on 370 ℃, completes after the pushing distortion of transition stage, stops 7s.As shown in Figure 6, adopt forcing press to apply pushing force to cylinder base 4, by the heat effect of ring shaped heating mechanism 2, improve or maintain the temperature of a base 4 in changeover portion 12 pushing processes, increase the plastic deformation ability of cylinder base 4, after the pushing of changeover portion 12 finishes, by being incubated the temperature of further increase or maintenance cylinder base 4, increase the plasticity of cylinder base 4, for next step the distortion of change square-section section 13 is prepared.
3) become square-section section pushing: open linear heating device 3, cylinder base flange temperature is remained on to 380 ℃, after with the speed of 30 mm/s, cylinder base 4 being urged to and being shaped, unload.By linear heating device 3 cartridge heater base flanges, increase the plastic deformation ability of cylinder base flange, and does not heat the stretching side of cylinder base 4, in pushing process, the temperature of stretching side reduces gradually, and tensile strength strengthens gradually, and along with tensile side facial disfigurement is increasing, tension demand also progressively increases, and therefore, the tensile strength of stretching side can meet a requirement for base pushing forming.
4) close ring shaped heating mechanism 2 and linear heating device 3, move back mould.
The present embodiment etc. the differential temperature pushing preparation cylinder blank technology of Dao Bian square-section, circular section pushing process is divided into three phases, each stage adopts different heat protocol to cylinder base 4, when cylindrical segment pushes, after cylinder base 4 is sleeved on cylindrical segment 11, again by the heating of cylinder base, for follow-up distortion is prepared; When changeover portion 12 pushing, because cylinder base 4 starts distortion, with 4 heating of 2 pairs of cylinder bases of ring shaped heating mechanism, increase statue, suitably adjust pushing speed, to obtain good distortion; When becoming 13 pushing of square-section section, the flange heating increase plasticity for cylinder base 4, does not heat the stretching side of cylinder base, increases the tensile strength of cylinder base 4 stretching sides, and because deflection is large, the suitable reduction of pushing speed can prevent the generation of defects i.e.cracks.
Therefore, the flange that adopts the differential temperature pushing preparation cylinder blank technology that waits Dao Bian square-section, circular section of the present embodiment can overcome a base 4 in existing cylinder base 4 pushing processes need to meet the contradiction that certain plastic deformation and stretching side must guarantee enough tensile strength, when making the fillet flange 14 of a base 4 there is good plastic deformation, stretching side also has higher tensile strength, and guarantee that cylinder base there will not be the phenomenon of crackle or attenuation in pushing manufacturing process, improves the quality of cylinder base.
Further improvement as the present embodiment technical scheme, in the pushing process of the change square-section section 13 of described step 3), the stretching side that adopts roller I 5 to compress described cylinder base 4 is pushing in the change square-section section of mould 1, described step 2), in changeover portion 12 pushing processes, adopt roller II 6 clamping cylinder bases 4 on the changeover portion of pushing mould 1.Because the metal stock deformation area of the stretching side of cylinder base 4 is larger, even for guaranteeing tensile side facial disfigurement, in changeover portion 12 and described change square-section section 13, increase roller, while impelling like this base to be out of shape, be close to mould, prevented to a great extent the generation of sidewall region defects i.e.cracks.
Further improvement as the present embodiment technical scheme, described step 2) and in step 3), to the cooling through hole 8 that is arranged on described pushing mould 1 center is interior, continue to pass into the compressed air for 4 temperature rises of application cylinder base, take away the frictional heat between a base 4 and pushing mould 1, thereby the temperature rise of application cylinder base 4, the quality of assurance pushing forming.
the 3rd embodiment
The present embodiment etc. the differential temperature pushing preparation cylinder blank technology of Dao Bian square-section, circular section, comprise the steps:
1) cylindrical segment 11 pushings: after the cylinder base 4 of hollow cylinder is sleeved on the cylindrical segment 11 that pushes mould 1, open heating jacket 7, cylinder base 4 is heated to 360 ℃, and is incubated after 7s, close heating jacket 7.Plasticity by 4 heating of cylinder base for increasing cylinder base 4, for deformation after unloading is prepared.
2) changeover portion 12 pushing: load, the changeover portion 12 with the speed pushing cylinder base 4 of 43mm/s to pushing mould 1 is opened ring shaped heating mechanism 2 simultaneously, makes a base 4 temperature remain on 400 ℃, completes after the pushing distortion of transition stage, stops 8s.As shown in Figure 6, adopt forcing press to apply pushing force to cylinder base 4, by the heat effect of ring shaped heating mechanism 2, improve or maintain the temperature of a base 4 in changeover portion 12 pushing processes, increase the plastic deformation ability of cylinder base 4, after the pushing of changeover portion 12 finishes, by being incubated the temperature of further increase or maintenance cylinder base 4, increase the plasticity of cylinder base 4, for next step the distortion of change square-section section 13 is prepared.
3) become square-section section pushing: open linear heating device 3, cylinder base flange temperature is remained on to 400 ℃, after with the speed of 27 mm/s, cylinder base 4 being urged to and being shaped, unload.By linear heating device 3 cartridge heater base flanges, increase the plastic deformation ability of cylinder base flange, and does not heat the stretching side of cylinder base 4, in pushing process, the temperature of stretching side reduces gradually, and tensile strength strengthens gradually, and along with tensile side facial disfigurement is increasing, tension demand also progressively increases, and therefore, the tensile strength of stretching side can meet a requirement for base pushing forming.
4) close ring shaped heating mechanism 2 and linear heating device 3, move back mould.
The present embodiment etc. the differential temperature pushing preparation cylinder blank technology of Dao Bian square-section, circular section pushing process is divided into three phases, each stage adopts different heat protocol to cylinder base 4, when cylindrical segment pushes, after cylinder base 4 is sleeved on cylindrical segment 11, again by the heating of cylinder base, for follow-up distortion is prepared; When changeover portion 12 pushing, because cylinder base 4 starts distortion, with 4 heating of 2 pairs of cylinder bases of ring shaped heating mechanism, increase statue, suitably adjust pushing speed, to obtain good distortion; When becoming 13 pushing of square-section section, the flange heating increase plasticity for cylinder base 4, does not heat the stretching side of cylinder base, increases the tensile strength of cylinder base 4 stretching sides, and because deflection is large, the suitable reduction of pushing speed can prevent the generation of defects i.e.cracks.
Therefore, the flange that adopts the differential temperature pushing preparation cylinder blank technology that waits Dao Bian square-section, circular section of the present embodiment can overcome a base 4 in existing cylinder base 4 pushing processes need to meet the contradiction that certain plastic deformation and stretching side must guarantee enough tensile strength, when making the fillet flange 14 of a base 4 there is good plastic deformation, stretching side also has higher tensile strength, and guarantee that cylinder base there will not be the phenomenon of crackle or attenuation in pushing manufacturing process, improves the quality of cylinder base.
Further improvement as the present embodiment technical scheme, in the pushing process of the change square-section section 13 of described step 3), the stretching side that adopts roller I 5 to compress described cylinder base 4 is pushing in the change square-section section of mould 1, described step 2), in changeover portion 12 pushing processes, adopt roller II 6 clamping cylinder bases 4 on the changeover portion of pushing mould 1.Because the metal stock deformation area of the stretching side of cylinder base 4 is larger, even for guaranteeing tensile side facial disfigurement, in changeover portion 12 and described change square-section section 13, increase roller, while impelling like this base to be out of shape, be close to mould, prevented to a great extent the generation of sidewall region defects i.e.cracks.
Further improvement as the present embodiment technical scheme, described step 2) and in step 3), to the cooling through hole 8 that is arranged on described pushing mould 1 center is interior, continue to pass into the compressed air for 4 temperature rises of application cylinder base, take away the frictional heat between a base 4 and pushing mould 1, thereby the temperature rise of application cylinder base 4, the quality of assurance pushing forming.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. etc. the differential temperature of Dao Bian square-section, a circular section pushing preparation cylinder blank technology, is characterized in that: comprise the steps:
1) cylindrical segment heating: after the cylinder base of hollow cylinder is sleeved on the cylindrical segment that pushes mould, open heating jacket, cylinder base is heated to 350 ± 10 ℃, and is incubated after 6 ~ 8s, close heating jacket;
2) changeover portion pushing: load, to the changeover portion that pushes mould, open ring shaped heating mechanism with the speed pushing cylinder base of 40 ~ 45mm/s simultaneously, make a base temperature remain on 350-400 ℃, complete after the pushing distortion of transition stage, stop 6 ~ 8s;
3) become square-section section pushing: open linear heating device, cylinder base flange temperature is remained on to 350-400 ℃, after with the speed of 25 ~ 30 mm/s, cylinder base being urged to and being shaped, unload;
4) close ring shaped heating mechanism and linear heating device, move back mould.
2. the differential temperature of the Dao Bian square-section, circular section such as an according to claim 1 pushing preparation cylinder blank technology, is characterized in that: in described step 3), adopt stretching side that roller I compresses described cylinder base in the change square-section section of pushing mould.
3. the differential temperature of the Dao Bian square-section, circular section such as an according to claim 1 pushing preparation cylinder blank technology, is characterized in that: described step 2), adopt roller II clamping cylinder base on the changeover portion of pushing mould.
According to described in claim 1-3 any one etc. the differential temperature pushing preparation cylinder blank technology of Dao Bian square-section, circular section, it is characterized in that: described step 2) and in step 3), to being arranged in the cooling through hole of described pushing mold center, continue to pass into the compressed air for the temperature rise of application cylinder base.
5. a differential temperature pushing preparation blanking device that waits Dao Bian square-section, circular section for the pushing of the differential temperature for the Dao Bian square-section, circular section such as described in a claim 1-4 any one preparation cylinder blank technology, comprise pushing mould, described pushing mould is provided with cylindrical segment, changeover portion and change square-section section, it is characterized in that: also comprise around the heating jacket being arranged on outside described cylindrical segment, around being arranged on the outer ring shaped heating mechanism of surveying of described changeover portion and extending the linear heating device of setting along the fillet flange of described change square-section section, described heating jacket, ring shaped heating mechanism and linear heating device are more than or equal to the thickness of a base to the distance of described pushing die surface.
6. the differential temperature of the Dao Bian square-section, circular section such as an according to claim 5 pushing preparation cylinder blanking device, is characterized in that: the stretching side of described change square-section section is provided with for flattening the roller I of workpiece.
7. the differential temperature of the Dao Bian square-section, circular section such as an according to claim 6 pushing preparation cylinder blanking device, is characterized in that: described changeover portion is provided with for flattening the roller II of workpiece.
According to described in claim 5-7 any one etc. the differential temperature pushing preparation cylinder blanking device of Dao Bian square-section, circular section, it is characterized in that: the center of described pushing mould is in axial direction provided with cooling through hole.
According to described in claim 5-7 any one etc. the differential temperature pushing preparation cylinder blanking device of Dao Bian square-section, circular section, it is characterized in that: the calandria of described ring shaped heating mechanism and linear heating device is resistance wire, the resistance wire of described ring shaped heating mechanism was around described changeover portion one week.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210094967.1A CN102632136B (en) | 2012-03-31 | 2012-03-31 | Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section |
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|---|---|---|---|
| CN201210094967.1A CN102632136B (en) | 2012-03-31 | 2012-03-31 | Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section |
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| CN107097457B (en) * | 2017-06-23 | 2023-08-08 | 嘉兴市新发现机械制造有限公司 | Bottom pressing device for rectangular paper container |
| CN113510968B (en) * | 2021-04-01 | 2022-12-16 | 浙江新德宝机械有限公司 | Paper container barrel body forming die device and paper container forming equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1835199U (en) * | 1961-03-17 | 1961-07-20 | Walter Alfmeier | RECORD STAND. |
| CN101085462A (en) * | 2007-07-03 | 2007-12-12 | 航天晨光股份有限公司 | Seamless forming method for cordiform bending cone abnormity thin wall cylinder |
| CN101537436A (en) * | 2009-04-14 | 2009-09-23 | 四川泛华航空仪表电器厂 | Method for processing reducer pipe by integral cold drawing molding |
| CN101559447A (en) * | 2009-05-22 | 2009-10-21 | 姚宁 | Thin wall pipe connector and processing method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2866603B2 (en) * | 1995-02-23 | 1999-03-08 | 祥浩 青木 | Fitting part structure and fitting part processing device for building tubular material |
| DE102006012086A1 (en) * | 2006-03-14 | 2007-09-20 | Muhr Und Bender Kg | Suspension strut made of flexibly rolled sheet metal |
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2012
- 2012-03-31 CN CN201210094967.1A patent/CN102632136B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1835199U (en) * | 1961-03-17 | 1961-07-20 | Walter Alfmeier | RECORD STAND. |
| CN101085462A (en) * | 2007-07-03 | 2007-12-12 | 航天晨光股份有限公司 | Seamless forming method for cordiform bending cone abnormity thin wall cylinder |
| CN101537436A (en) * | 2009-04-14 | 2009-09-23 | 四川泛华航空仪表电器厂 | Method for processing reducer pipe by integral cold drawing molding |
| CN101559447A (en) * | 2009-05-22 | 2009-10-21 | 姚宁 | Thin wall pipe connector and processing method thereof |
Non-Patent Citations (1)
| Title |
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| JP特開平8-291677A 1996.11.05 |
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| CN102632136A (en) | 2012-08-15 |
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