CN103691750A - Extrusion technology for aluminum cylinder with external circular step - Google Patents
Extrusion technology for aluminum cylinder with external circular step Download PDFInfo
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- CN103691750A CN103691750A CN201310750625.5A CN201310750625A CN103691750A CN 103691750 A CN103691750 A CN 103691750A CN 201310750625 A CN201310750625 A CN 201310750625A CN 103691750 A CN103691750 A CN 103691750A
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Abstract
The invention discloses an extrusion technology for an aluminum cylinder with an external circular step. The extrusion technology comprises material unloading, blank treatment, preforming, external circle rough processing, annealing softening treatment, surface lubrication treatment, forming extrusion, external circle fine processing and the like. In the preforming step, a blank is extruded into a cylinder prefabricated piece; an inner hole of the cylinder prefabricated piece is a blind hole; the external circular step is formed on the external circular surface of the cylinder prefabricated piece; the height of the external circular step is lower than that of the bottom surface of the inner hole of the cylinder prefabricated piece; an internal circular step of which the opening part has a large diameter and the lower part has a small diameter is formed on the inner hole surface of the cylinder prefabricated piece. In the external circle rough processing step, the external circular step of the cylinder prefabricated piece is heightened through turning processing to form a cylinder extrusion piece; the height of the external circular step of the cylinder extrusion piece is higher than that of the bottom surface of the inner hole of the cylinder prefabricated piece. According to the extrusion technology, materials can be saved, the processing working time is short, and cracks in the inner surface of a cylinder body can be effectively prevented.
Description
Technical field
The present invention relates to a kind of extrusion process with the aluminium matter cylinder of cylindrical step.
Background technology
The aluminium matter cylinder (see figure 1) with step cylindrical, the internal circular surfaces of this aluminium matter cylinder 50 is the straight cylindrical surfaces that upper and lower diameter is identical, and outer round surface is the one-level step face of cylinder, and the upper diameter of cylindrical is large, and the lower diameter of cylindrical is little.The internal diameter of this aluminium matter cylinder 50 be about aluminum barrel length 1/3rd, the top wall thickness of this aluminium matter cylinder 50 is about 1/17th of the cylindrical shell degree of depth.Because the upper lower wall thickness of aluminium matter cylinder has difference, as adopt the technique manufacture of an extrusion modling, can cause the difference of material flowing velocity of the surfaces externally and internally of aluminium matter cylinder, the difference of this material flowing velocity can cause the tension of material internal, this tension easily causes the internal circular surfaces cracking of aluminium matter cylinder, and crackle is along internal diameter cross direction profiles.In order to overcome this crackle, common manufacture method is that the outer round surface of aluminium matter cylinder is squeezed into upper and lower diameter is identical, and then adopts the method for turning processing to process the step of outer round surface.Although the method has been avoided crackle, material consumption is larger, and machining period is also more.
Summary of the invention
The object of the invention is to overcome the defect of prior art, a kind of extrusion process with the aluminium matter cylinder of cylindrical step is provided, it can save material, and machining period is also relatively less, also can effectively avoid the inner surface of aluminium matter cylinder to produce cracking simultaneously.
The object of the present invention is achieved like this: a kind of extrusion process with the aluminium matter cylinder of cylindrical step, and the endoporus of described aluminium matter cylinder is that blind hole and diameter are Φ 1, and the outside diameter on the top of this aluminium matter cylinder is Φ 2, and the length of aluminium matter cylinder is L; Described extrusion process comprises the following steps:
Blanking step, selects the aluminium of a diameter adaptation to extrude rod in band sawing machine loading and unloading, makes one section of cylindrical blank part with the volume adaptation of described aluminium matter cylinder;
Blank treatment step, first removes the surperficial burr of blank, then the surface of blank is lubricated to processing;
Preformed step, by blank, by forward extrusion technological forming, be a cylinder preformed member, the endoporus of this cylinder preformed member is blind hole, on the periphery of this cylinder preformed member, there is a upper diameter large, the cylindrical step that lower diameter is little, the height H 1 of this cylindrical step is lower than the bottom surface height H 0 of the endoporus of cylinder preformed member, and H0-H1=3～5mm, in the inner hole surface of this cylinder preformed member, there is a mouth diameters large, the inner circle step that lower diameter is little, this inner circle step is by the pre-extruding drift moulding that is step column structure, / 3rd of a barrel wall thickness that this pre-width that pushes the step of drift is cylindrical shell preformed member, and the face of the step of this drift is that angle is the inclined-plane of 45 °,
Cylindrical roughing step, the height H 1 of the cylindrical step of cylinder preformed member is processed and is lifted to H2 and becomes cylinder extrusion by turning, the height of the cylindrical step of this cylinder extrusion be H2 higher than the bottom surface height H 0 of the endoporus of cylinder preformed member, and H2-H0=10～12mm;
Annealing softening treatment step;
Surface lubrication treatment step;
Moulding compression step, is shaped to cylinder profiled member by cylinder extrusion by backward extrusion technology.
The extrusion process of the above-mentioned aluminium matter cylinder with cylindrical step, wherein, the diameter of bore Φ 1 of the diameter of bore of the bottom of described cylinder preformed member and described aluminium matter cylinder is corresponding, and outside diameter Φ 2 and the amount of being greater than that the outside diameter on the top of described cylinder preformed member is greater than the top of described aluminium matter cylinder are 1.7mm～1.9mm.
The extrusion process of the above-mentioned aluminium matter cylinder with cylindrical step, wherein, the length L 2 of described cylinder preformed member is 1～1.2 times of internal diameter Φ 1 of described aluminium matter cylinder, the length of this cylinder preformed member is the bottom surface height H 0 of the L2 endoporus that deducts cylinder preformed member, and the barrel volume of the volume of L2-HO representative and described aluminium matter cylindrical shell is suitable; The height L3 of the inner circle step of this cylinder preformed member be described cylinder preformed member interior hole depth L2-H0 25%～30%.
The extrusion process of the above-mentioned aluminium matter cylinder with cylindrical step, wherein, the face of the cylindrical step of described cylinder extrusion is arc surface.
The extrusion process with the aluminium matter cylinder of cylindrical step of the present invention, has following beneficial effect:
1) preformed step is mainly to reduce material consumption and the machining period of cylindrical turning;
2) in carrying out preformed step, first preformed cylindrical step, but cylindrical step must be lower than the bottom surface height of endoporus, if can there is crackle at changes of section place higher than the bottom surface height of endoporus in cylindrical step.
3) when carrying out preformed step, oral area at endoporus squeezes out an inner circle step, existence due to this inner circle step, the metal flow resistance of cylindrical shell inner side is increased, thereby reduced the current difference of inside and outside material, and reduced the tension of material internal, reduced the tendency that crackle produces inside cylindrical shell simultaneously.In moulding compression step, due to the bottom surface height of cylindrical step higher than endoporus, major diameter part more than round platform rank, extrusion process China and foreign countries is only done rigidity translation, no longer participate in distortion, therefore at changes of section place, can not exist again the flow rate of material poor, just there is not the tension of material internal, just can avoid the crackle of aluminium matter cylinder interior to produce yet yet.
Accompanying drawing explanation
Fig. 1 is the structural representation with the aluminium matter cylinder of cylindrical step;
Fig. 2 is the structural representation of the blank after the execution blanking step of extrusion process of the aluminium matter cylinder with cylindrical step of the present invention;
Fig. 3 is the structural representation of the cylinder preformed member after the execution preformed step of extrusion process of the aluminium matter cylinder with cylindrical step of the present invention;
Fig. 4 is the structural representation of the cylinder extrusion after the execution cylindrical roughing step of extrusion process of the aluminium matter cylinder with cylindrical step of the present invention;
Fig. 5 is the structural representation of the cylinder profiled member after the execution moulding compression step of extrusion process of the aluminium matter cylinder with cylindrical step of the present invention;
Fig. 6 is the side view of Fig. 5.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Consult Fig. 1, the endoporus with the aluminium matter cylinder 50 of cylindrical step is that blind hole and diameter are Φ 1, and the outside diameter on the top of this aluminium matter cylinder 50 is Φ 2, and the length of aluminium matter cylinder 50 is L.
Refer to Fig. 2 to Fig. 6 also in conjunction with consulting Fig. 1, the extrusion process with the aluminium matter cylinder of cylindrical step of the present invention, comprises the following steps again:
Blanking step, selects the aluminium of a diameter adaptation to extrude rod in band sawing machine loading and unloading, makes the cylindrical blank part 10 of a section and aluminum cylinder volume adaptation, only stays the required a small amount of machining allowance of roughing in appearance and size;
Blank treatment step, first remove the surperficial burr of blank 10, then the surface of blank 11 is lubricated to processing, the working surface at blank 11 adheres to one deck lubricating film, allow blank 11 contact with pre-extrusion die smooth and easy, to extend the service life of mould;
Preformed step, puts into pre-extrusion die by blank 10, by forward extrusion technological forming, is that a length L 2 is cylinder preformed member 20; The length L 2 of this cylinder preformed member 20 is 1～1.2 times of internal diameter Φ 1 of aluminium matter cylinder 50; The endoporus of this cylinder preformed member 20 is blind hole; On the periphery of this cylinder preformed member 20, have the cylindrical step that a upper diameter is large, lower diameter is little, the height H 1 of this cylindrical step is lower than the bottom surface height H 0 of the endoporus of cylinder preformed member 20, and H0-H1=3～5mm; Outside diameter Φ 2 and the amount of being greater than that the outside diameter on the top of this cylinder preformed member 20 is greater than the top of aluminium matter cylinder 50 are 1.7mm～1.9mm; The length L 2 of this cylinder preformed member deducts the bottom surface height H 0 of the endoporus of cylinder preformed member 20, and the barrel volume of the volume of L2-HO representative and aluminium matter cylindrical shell 50 is suitable; In the inner hole surface of this cylinder preformed member 20, there is the inner circle step that a mouth diameters is large, lower diameter is little, this inner circle step is by the pre-extruding drift moulding that is step column structure, / 3rd of a barrel wall thickness that this pre-width that pushes the step of drift is cylindrical shell preformed member 20, and the face of the step of this drift is that angle is the inclined-plane of 45 °; The diameter of bore Φ 1 of the diameter of bore of the bottom of this cylinder preformed member 20 and aluminium matter cylinder 50 is corresponding, the height L3 of the inner circle step of this cylinder preformed member be cylinder preformed member 20 interior hole depth L2-H0 25%～30%.
Cylindrical roughing step, the height H 1 of the cylindrical step of cylinder preformed member 20 is processed and is lifted to H2 and becomes cylinder extrusion 30 by turning, the height of the cylindrical step of this cylinder extrusion 30 be H2 higher than the bottom surface height H 0 of the endoporus of cylinder preformed member 20, and H2-H0=10～12mm; The face of the cylindrical step of this cylinder extrusion 30 is arc surface
Annealing softening treatment step, to eliminate the internal material stresses of cylinder extrusion 30;
Surface lubrication treatment step; The working surface at cylinder extrusion 30 adheres to one deck lubricating film, allows cylinder extrusion 30 contact with extrusion die smooth and easy, to extend the service life of mould;
Moulding compression step, puts into extrusion die by cylinder extrusion 30 and is shaped to cylinder profiled member 40 by backward extrusion technology.
The extrusion process with the aluminium matter cylinder of cylindrical step of the present invention, preformed step is wherein mainly to reduce material consumption and the machining period of cylindrical turning.In carrying out preformed step, first preformed cylindrical step, but cylindrical step must be lower than the bottom surface height of endoporus, if can there is crackle at changes of section place higher than the bottom surface height of endoporus in cylindrical step.In addition when carrying out preformed step, oral area at endoporus squeezes out an inner circle step, existence due to this inner circle step, the metal flow resistance of cylindrical shell inner side is increased, thereby reduced the current difference of inside and outside material, and reduced the tension of material internal, reduced the tendency that crackle produces inside cylindrical shell simultaneously.In moulding compression step, due to the bottom surface height of cylindrical step higher than endoporus, major diameter part more than round platform rank, extrusion process China and foreign countries is only done rigidity translation, no longer participate in distortion, therefore at changes of section place, can not exist again the flow rate of material poor, just there is not the tension of material internal, just can avoid the crackle of inner barrel to produce yet yet.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (4)
1. an extrusion process with the aluminium matter cylinder of cylindrical step, the endoporus of described aluminium matter cylinder is that blind hole and diameter are Φ 1, and the outside diameter on the top of this aluminium matter cylinder is Φ 2, and the length of aluminium matter cylinder is L, it is characterized in that, described extrusion process comprises the following steps:
Blanking step, selects the aluminium of a diameter adaptation to extrude rod in band sawing machine loading and unloading, makes one section of cylindrical blank part with the volume adaptation of described aluminium matter cylinder;
Blank treatment step, first removes the surperficial burr of blank, then the surface of blank is lubricated to processing;
Preformed step, by blank, by forward extrusion technological forming, be a cylinder preformed member, the endoporus of this cylinder preformed member is blind hole, on the periphery of this cylinder preformed member, there is a upper diameter large, the cylindrical step that lower diameter is little, the height H 1 of this cylindrical step is lower than the bottom surface height H 0 of the endoporus of cylinder preformed member, and H0-H1=3～5mm, in the inner hole surface of this cylinder preformed member, there is a mouth diameters large, the inner circle step that lower diameter is little, this inner circle step is by the pre-extruding drift moulding that is step column structure, / 3rd of a barrel wall thickness that this pre-width that pushes the step of drift is cylindrical shell preformed member, and the face of the step of this drift is that angle is the inclined-plane of 45 °,
Cylindrical roughing step, the height H 1 of the cylindrical step of cylinder preformed member is processed and is lifted to H2 and becomes cylinder extrusion by turning, the height of the cylindrical step of this cylinder extrusion be H2 higher than the bottom surface height H 0 of the endoporus of cylinder preformed member, and H2-H0=10～12mm;
Annealing softening treatment step;
Surface lubrication treatment step;
Moulding compression step, is shaped to cylinder profiled member by cylinder extrusion by backward extrusion technology.
2. the extrusion process with the aluminium matter cylinder of cylindrical step according to claim 1, it is characterized in that, the diameter of bore Φ 1 of the diameter of bore of the bottom of described cylinder preformed member and described aluminium matter cylinder is corresponding, and outside diameter Φ 2 and the amount of being greater than that the outside diameter on the top of described cylinder preformed member is greater than the top of described aluminium matter cylinder are 1.7mm～1.9mm.
3. the extrusion process with the aluminium matter cylinder of cylindrical step according to claim 1 and 2, it is characterized in that, the length L 2 of described cylinder preformed member is 1～1.2 times of internal diameter Φ 1 of described aluminium matter cylinder, the length of this cylinder preformed member is the bottom surface height H 0 of the L2 endoporus that deducts cylinder preformed member, and the barrel volume of the volume of L2-HO representative and described aluminium matter cylindrical shell is suitable; The height L3 of the inner circle step of this cylinder preformed member be described cylinder preformed member interior hole depth L2-H0 25%～30%.
4. the extrusion process with the aluminium matter cylinder of cylindrical step according to claim 1, is characterized in that, the face of the cylindrical step of described cylinder extrusion is arc surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310750625.5A CN103691750A (en) | 2013-12-31 | 2013-12-31 | Extrusion technology for aluminum cylinder with external circular step |
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| CN201310750625.5A CN103691750A (en) | 2013-12-31 | 2013-12-31 | Extrusion technology for aluminum cylinder with external circular step |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921671A (en) * | 2016-07-13 | 2016-09-07 | 霍山汇能汽车零部件制造有限公司 | Backward extrusion forming method of stepped hollow shaft part and die |
| CN105921539A (en) * | 2016-05-20 | 2016-09-07 | 内蒙古北方重工业集团有限公司 | Manufacturing method for large-caliber deep blind hole workpiece |
| CN106392473A (en) * | 2016-09-21 | 2017-02-15 | 南京理工大学常熟研究院有限公司 | Method for preparing long-fatigue-life planar micro-spring |
| CN106903482A (en) * | 2017-01-22 | 2017-06-30 | 盐城理研精密锻造有限公司 | A kind of cold-forge forming technique of thin-wall tube-shaped metal parts |
-
2013
- 2013-12-31 CN CN201310750625.5A patent/CN103691750A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921539A (en) * | 2016-05-20 | 2016-09-07 | 内蒙古北方重工业集团有限公司 | Manufacturing method for large-caliber deep blind hole workpiece |
| CN105921671A (en) * | 2016-07-13 | 2016-09-07 | 霍山汇能汽车零部件制造有限公司 | Backward extrusion forming method of stepped hollow shaft part and die |
| CN106392473A (en) * | 2016-09-21 | 2017-02-15 | 南京理工大学常熟研究院有限公司 | Method for preparing long-fatigue-life planar micro-spring |
| CN106903482A (en) * | 2017-01-22 | 2017-06-30 | 盐城理研精密锻造有限公司 | A kind of cold-forge forming technique of thin-wall tube-shaped metal parts |
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