US20120030929A1 - Method for producing a component of a synchronization device for a manual transmission - Google Patents
Method for producing a component of a synchronization device for a manual transmission Download PDFInfo
- Publication number
- US20120030929A1 US20120030929A1 US13/265,048 US201013265048A US2012030929A1 US 20120030929 A1 US20120030929 A1 US 20120030929A1 US 201013265048 A US201013265048 A US 201013265048A US 2012030929 A1 US2012030929 A1 US 2012030929A1
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- United States
- Prior art keywords
- forming
- forming portion
- round blank
- hardened
- component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/16—Making other particular articles rings, e.g. barrel hoops
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/02—Arrangements for synchronisation, also for power-operated clutches
- F16D23/025—Synchro rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
Definitions
- the invention relates to a method for producing a component of a synchronization device for a manual transmission according to the preamble of claim 1 , and also to a component of a synchronization device for a manual transmission.
- Such a method is known from DE 35 19 811 52.
- a round blank which has been stamped from a metal sheet is subjected to a multiplicity of cold forming steps in succession.
- a plurality of successive cold forming substeps are often additionally required.
- firstly preforms of the contour are produced, and the contour is finally produced in a last cold forming substep.
- a further disadvantage of the known method is that the synchronizer rings produced thereby, for example, subsequently have to be hardened in their functional regions, for example in the case of contours, such as toothed systems, indexing studs, centering studs or driving tabs.
- the intention in particular is to specify an extremely simple and cost-effective method for producing a component of a synchronization device for a manual transmission, in particular a synchronizer ring.
- a further aim of the invention consists in the specification of a component, which is extremely inexpensive and simple to produce, of a synchronization device for a manual transmission, in particular a synchronizer ring.
- At least one of the forming steps is a hot forming step in which the round blank is partially heated to a temperature of more than 600° C. and is then formed in the partially heated forming portion.
- the invention provides that the plurality of cold forming substeps for producing a desired contour are replaced in each case by a single hot forming step.
- the round blank is heated merely in portions, specifically in the region of the forming portion to be formed, to a temperature of more than 600° C., preferably to a temperature in the range of 650° C. to 850° C., and is then formed in this partially heated forming portion.
- the formed portion can be cooled at a predefined cooling rate and a specific microstructure can thus be set.
- the round blank is produced by means of stamping.
- the term “round blank” is understood in general terms. It is generally a metal sheet with a substantially round outer contour.
- a round blank can also be, in particular, an annular body.
- the proposed method for producing the round blank by means of stamping is particularly cost-effective. It goes without saying that it is also possible to produce the round blank by other common processes, for example sawing, water jet cutting or laser cutting.
- At least one of the forming steps is a cold forming step, preferably deep drawing.
- a cold forming step as is known according to the prior art, is retained particularly when it can be carried out in a single step.
- the round blank is advantageously produced from steel, preferably from a steel alloy. If the intention is to form, but not harden, a component, micro-alloyed steels, e.g. HC260LA, and low-alloy or unalloyed steels, for example D04, have proved to be particularly suitable. If the intention is to harden a component at least in partial regions, standard heat-treated steels have proved to be particularly suitable, as defined for example in EN 10132. Steels such as C45 are also suitable. Steel alloys, e.g. 22MnB5 or 80CrV2, have also proved to be expedient.
- the round blank is deformed in the forming portion and then at least partially hardened during the hot forming step.
- the forming portion is heated to a temperature above the austenitization temperature.
- the austenitization temperature depends on the steel or on the steel alloy. It is usually in the range of 850° C. to 1000° C.
- the quenching is preferably effected by at least partial contact between the forming portion (contact hardening) and a heat sink, for example a metal mold matched to the shape of the forming portion.
- the round blank is not only deformed but also press-hardened in the forming portion during the hot forming step.
- the forming portion is heated to a temperature above the austenitization temperature.
- the austenitization temperature depends on the steel or on the steel alloy. It is usually in the range of 850° C. to 1000° C.
- the round blank is partially heated by means of laser or induction.
- the forming portion of the round blank generally amounts to less than 50%, preferably less than 30%, in particular less than 20%, of the volume thereof. That is to say, during the partial heating of the forming portion which is proposed according to the invention, exclusively this portion is heated to the given temperature. The remaining portions of the round blank are not heated up to this temperature.
- the thermal energy required for partial heating is supplied to the forming portion in less than three seconds, preferably less than one second. It is thereby possible to keep the introduction of heat limited to the predefined forming portion.
- the short heat introduction times proposed make a particularly rapid procedure possible.
- the forming portion is formed to the desired contour, quenched at the same time and consequently hardened.
- the formed metal sheet is usually hardened down to a depth of 0.5 to 2 mm.
- the method according to the invention also makes it possible, in particular, to stamp the round blank after the hot forming step. This also holds true when a forming region of the round blank has been hardened by the hot forming step. In this case, the following stamping step is expediently limited to those regions of the round blank which have not been previously hardened.
- the hot forming step is carried out as a cycle in a cyclic sequence of forming and/or stamping steps. That is to say, the hot forming step can be implemented in a cyclically working line for the large-scale production of components of a synchronization device.
- a component of a synchronization device for a manual transmission in particular a synchronizer ring, has at least one press-hardened forming portion.
- the press-hardened forming portion can have one of the following configurations: toothing, indexing stud, centering stud, driving tab, driving stud, connecting web.
- a “synchronization device” is understood to mean a device which adapts a rotational speed differential between the shaft and the gear wheel to be shifted.
- the synchronization device can also comprise further components, such as a sliding sleeve, a sleeve carrier and also a gear wheel or loose wheel.
- the single drawing shows, in a perspective view, a synchronization assembly of a synchronization device (not shown in further detail here).
- the synchronization assembly comprises an outer ring 1 , an intermediate ring 2 and an inner ring 3 .
- the outer ring is provided with toothing or gear toothing 4 in portions on its outer circumference.
- the reference symbol 5 denotes centering studs and the reference symbol 6 denotes indexing studs with indexing stud side faces 6 a , which are fitted between the portions of the toothing 4 .
- Driving tabs 7 with driving tab side faces 7 a extend from the inner circumference.
- An inner circumferential surface of the outer ring 1 forms a first friction surface 8 .
- the intermediate ring 2 has a second friction surface 9 on its inner circumference and a third friction surface 10 on its outer circumference.
- the reference symbol 11 denotes driving studs with driving stud side faces 11 a which extend in the axial direction.
- the inner ring 3 has a fourth friction surface 12 on its inner circumference and a fifth friction surface 13 on its outer circumference.
- the reference symbol 14 denotes connecting studs which extend axially in the direction of the outer ring 1 .
- a round blank of annular form is stamped out from a suitable steel sheet, for example of the steel grade C45 or 80CrV2. Then, a conical geometry is given to the round blank in a conventional deep-drawing step. This is followed by a hot forming and calibration step, in which the conical portion produced is initially heated in portions to a temperature above the austenitization temperature and is then calibrated and press-hardened with a cooled pressing tool.
- the toothing 4 is then preformed by means of stamping.
- the preformed toothing is partially heated to a temperature above the austenitization temperature and is then formed to its predefined contour in a first hot forming step with a cooled pressing tool.
- the toothing 4 is press-hardened at the same time.
- the indexing studs 5 and also the centering studs 6 are then formed.
- the appropriate forming regions are partially heated to a temperature above the austenitization temperature and are then formed to their predefined contour with a cooled pressing tool, and press-hardened at the same time.
- the driving tabs 7 are preformed.
- the driving tabs 7 are then partially heated in turn to a temperature above the austenitization temperature and are formed to their predefined contour with a cooled pressing tool. Here, they are press-hardened at the same time.
- every hot forming step has to be accompanied by press-hardening.
- the intention is to harden the forming region to be subjected to hot forming and press-hardening with the forming tool should not suffice for this purpose, it is additionally possible for, e.g. lateral, contact pressure to be applied after repeated heating to a temperature above the austenitization temperature.
- This is expedient particularly for the production of the indexing stud side faces 2 a , the driving stud side faces 8 a and also the connecting web side faces 12 a and the driving tab side faces 3 a.
- the intermediate ring 2 and the inner ring 3 can be produced in a similar way.
- an annular round blank is firstly stamped out.
- the round blank is given a conical shape by deep drawing.
- the cone is calibrated in turn in a hot forming and calibration step.
- the conical geometry can be set exactly in this case. At the same time, it is thereby possible to achieve press-hardening, in particular of the friction surfaces.
- driving studs 11 and connecting studs 14 can initially be preformed by means of stamping and then be formed to their end contour in a single hot forming step, it being possible for press-hardening to be effected in each case.
- the driving stud side faces 11 a and the connecting web side faces 14 a can be hardened, if necessary, by the lateral application of contact pressure.
- the method proposed according to the invention simplifies the production process significantly and makes it more cost-effective, in particular in the case of synchronizer rings.
- conventional cold forming steps can be combined with hot forming steps.
- the hot forming steps make it possible to achieve a high degree of forming. It is possible to replace a plurality of the cold forming substeps required for producing the same degree of forming with a single hot forming step. At the same time, it is possible to press-harden the respective functional surfaces with the hot forming step. As a whole, this results in a considerably reduced number of production steps. A costly downstream hardening process can be dispensed with.
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- Chemical & Material Sciences (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a method for producing a component of a synchronization device for manual transmissions, in particular a synchronizer ring (1, 2, 3), wherein a round blank produced from metal is formed in a plurality of forming steps. In order to simplify the production process, it is proposed according to the invention that at least one of the forming steps is a hot forming step in which the round blank is partially heated to a temperature of more than 600° C. and is then formed in the partially heated forming portion.
Description
- The invention relates to a method for producing a component of a synchronization device for a manual transmission according to the preamble of claim 1, and also to a component of a synchronization device for a manual transmission.
- Such a method is known from DE 35 19 811 52. Here, a round blank which has been stamped from a metal sheet is subjected to a multiplicity of cold forming steps in succession. In order to produce a specific predefined contour extending merely over a partial portion of the component, e.g. toothing, a plurality of successive cold forming substeps are often additionally required. In this case, firstly preforms of the contour are produced, and the contour is finally produced in a last cold forming substep. For each of the cold forming substeps, it is necessary to provide a complex and expensive forming tool. If the contour changes, it is necessary to change the corresponding forming tools. As a whole, the known method is therefore complex and expensive.
- A further disadvantage of the known method is that the synchronizer rings produced thereby, for example, subsequently have to be hardened in their functional regions, for example in the case of contours, such as toothed systems, indexing studs, centering studs or driving tabs.
- It is an object of the present invention to eradicate the disadvantages according to the prior art. The intention in particular is to specify an extremely simple and cost-effective method for producing a component of a synchronization device for a manual transmission, in particular a synchronizer ring. A further aim of the invention consists in the specification of a component, which is extremely inexpensive and simple to produce, of a synchronization device for a manual transmission, in particular a synchronizer ring.
- This object is achieved by the features of
claims 1 and 12. Expedient configurations of the invention are apparent from the features of claims 2 to 10 and 13. - In a method for producing a component of a synchronization device for a manual transmission, in particular a synchronizer ring, it is provided according to the invention that at least one of the forming steps is a hot forming step in which the round blank is partially heated to a temperature of more than 600° C. and is then formed in the partially heated forming portion. In a departure from the prior art, the invention provides that the plurality of cold forming substeps for producing a desired contour are replaced in each case by a single hot forming step. In order to carry out the hot forming step according to the invention, the round blank is heated merely in portions, specifically in the region of the forming portion to be formed, to a temperature of more than 600° C., preferably to a temperature in the range of 650° C. to 850° C., and is then formed in this partially heated forming portion. In this case, the formed portion can be cooled at a predefined cooling rate and a specific microstructure can thus be set.
- According to an advantageous configuration, the round blank is produced by means of stamping. Within the context of the present invention, the term “round blank” is understood in general terms. It is generally a metal sheet with a substantially round outer contour.
- Within the context of the present invention, a round blank can also be, in particular, an annular body. The proposed method for producing the round blank by means of stamping is particularly cost-effective. It goes without saying that it is also possible to produce the round blank by other common processes, for example sawing, water jet cutting or laser cutting.
- It is expedient that at least one of the forming steps is a cold forming step, preferably deep drawing. Such a cold forming step, as is known according to the prior art, is retained particularly when it can be carried out in a single step. By way of example, it is possible to give the round blank a conical shape in a cold forming step.
- The round blank is advantageously produced from steel, preferably from a steel alloy. If the intention is to form, but not harden, a component, micro-alloyed steels, e.g. HC260LA, and low-alloy or unalloyed steels, for example D04, have proved to be particularly suitable. If the intention is to harden a component at least in partial regions, standard heat-treated steels have proved to be particularly suitable, as defined for example in EN 10132. Steels such as C45 are also suitable. Steel alloys, e.g. 22MnB5 or 80CrV2, have also proved to be expedient.
- According to an advantageous configuration, the round blank is deformed in the forming portion and then at least partially hardened during the hot forming step. For this purpose, the forming portion is heated to a temperature above the austenitization temperature. The austenitization temperature depends on the steel or on the steel alloy. It is usually in the range of 850° C. to 1000° C. The quenching of the forming portion heated to a temperature above the austenitization temperature, which takes place after the forming, hardens said portion. The quenching is preferably effected by at least partial contact between the forming portion (contact hardening) and a heat sink, for example a metal mold matched to the shape of the forming portion. By using the proposed method steps, it is advantageously possible for selected regions of the forming portion to be hardened.
- According to a particularly advantageous configuration, the round blank is not only deformed but also press-hardened in the forming portion during the hot forming step. For this purpose, the forming portion is heated to a temperature above the austenitization temperature. The austenitization temperature depends on the steel or on the steel alloy. It is usually in the range of 850° C. to 1000° C. The quenching of the forming portion heated to a temperature above the austenitization temperature, which takes place at the same time as forming, hardens said portion. By using the proposed method steps, it is possible to dispense with the hardening method which follows the shaping according to the prior art. Shaping and hardening can be effected at the same time according to the method proposed according to the invention. As a result, the method proposed according to the invention is particularly efficient.
- According to a further expedient configuration, the round blank is partially heated by means of laser or induction. With the processes mentioned, it is possible to transfer a high thermal energy to the portion of the round blank to be formed particularly quickly. The forming portion of the round blank generally amounts to less than 50%, preferably less than 30%, in particular less than 20%, of the volume thereof. That is to say, during the partial heating of the forming portion which is proposed according to the invention, exclusively this portion is heated to the given temperature. The remaining portions of the round blank are not heated up to this temperature.
- According to a further advantageous configuration, the thermal energy required for partial heating is supplied to the forming portion in less than three seconds, preferably less than one second. It is thereby possible to keep the introduction of heat limited to the predefined forming portion. In addition, the short heat introduction times proposed make a particularly rapid procedure possible.
- It has proved to be particularly expedient, in particular in large-scale production, to use a cooled forming tool for quenching. As a result of contact with the forming tool, the forming portion is formed to the desired contour, quenched at the same time and consequently hardened. Here, the formed metal sheet is usually hardened down to a depth of 0.5 to 2 mm.
- The method according to the invention also makes it possible, in particular, to stamp the round blank after the hot forming step. This also holds true when a forming region of the round blank has been hardened by the hot forming step. In this case, the following stamping step is expediently limited to those regions of the round blank which have not been previously hardened.
- According to a further advantageous configuration, the hot forming step is carried out as a cycle in a cyclic sequence of forming and/or stamping steps. That is to say, the hot forming step can be implemented in a cyclically working line for the large-scale production of components of a synchronization device.
- It is also proposed according to the invention that a component of a synchronization device for a manual transmission, in particular a synchronizer ring, has at least one press-hardened forming portion. Here, the press-hardened forming portion can have one of the following configurations: toothing, indexing stud, centering stud, driving tab, driving stud, connecting web.
- Within the context of the present invention, a “synchronization device” is understood to mean a device which adapts a rotational speed differential between the shaft and the gear wheel to be shifted. In addition to at least one synchronizer ring, the synchronization device can also comprise further components, such as a sliding sleeve, a sleeve carrier and also a gear wheel or loose wheel. By way of example, reference is made to the synchronization device disclosed in
DE 10 2005 035 941 B3. The disclosure content of the exemplary embodiment in said document is hereby incorporated. - In the text which follows, exemplary embodiments of the invention are explained in more detail, in particular on the basis of the single drawing.
- The single drawing shows, in a perspective view, a synchronization assembly of a synchronization device (not shown in further detail here). The synchronization assembly comprises an outer ring 1, an intermediate ring 2 and an
inner ring 3. - The outer ring is provided with toothing or gear toothing 4 in portions on its outer circumference. The
reference symbol 5 denotes centering studs and thereference symbol 6 denotes indexing studs with indexing stud side faces 6 a, which are fitted between the portions of the toothing 4. Driving tabs 7 with driving tab side faces 7 a extend from the inner circumference. An inner circumferential surface of the outer ring 1 forms afirst friction surface 8. - The intermediate ring 2 has a
second friction surface 9 on its inner circumference and athird friction surface 10 on its outer circumference. Thereference symbol 11 denotes driving studs with driving stud side faces 11 a which extend in the axial direction. - The
inner ring 3 has afourth friction surface 12 on its inner circumference and afifth friction surface 13 on its outer circumference. Thereference symbol 14 denotes connecting studs which extend axially in the direction of the outer ring 1. - In order to produce the outer ring 1, firstly a round blank of annular form is stamped out from a suitable steel sheet, for example of the steel grade C45 or 80CrV2. Then, a conical geometry is given to the round blank in a conventional deep-drawing step. This is followed by a hot forming and calibration step, in which the conical portion produced is initially heated in portions to a temperature above the austenitization temperature and is then calibrated and press-hardened with a cooled pressing tool.
- In a further step, the toothing 4 is then preformed by means of stamping. The preformed toothing is partially heated to a temperature above the austenitization temperature and is then formed to its predefined contour in a first hot forming step with a cooled pressing tool. Here, the toothing 4 is press-hardened at the same time.
- In further hot forming steps, the
indexing studs 5 and also the centeringstuds 6 are then formed. In this case, too, the appropriate forming regions are partially heated to a temperature above the austenitization temperature and are then formed to their predefined contour with a cooled pressing tool, and press-hardened at the same time. - In a further stamping step, the driving tabs 7 are preformed. In a further hot forming step, the driving tabs 7 are then partially heated in turn to a temperature above the austenitization temperature and are formed to their predefined contour with a cooled pressing tool. Here, they are press-hardened at the same time.
- Within the context of the present invention, not every hot forming step has to be accompanied by press-hardening. By way of example, it is also possible to carry out one or more of the hot forming steps at a temperature below the austenitization temperature.
- If the intention is to harden the forming region to be subjected to hot forming and press-hardening with the forming tool should not suffice for this purpose, it is additionally possible for, e.g. lateral, contact pressure to be applied after repeated heating to a temperature above the austenitization temperature. This is expedient particularly for the production of the indexing stud side faces 2 a, the driving stud side faces 8 a and also the connecting web side faces 12 a and the driving tab side faces 3 a.
- The intermediate ring 2 and the
inner ring 3 can be produced in a similar way. Here, too, an annular round blank is firstly stamped out. Then, the round blank is given a conical shape by deep drawing. The cone is calibrated in turn in a hot forming and calibration step. The conical geometry can be set exactly in this case. At the same time, it is thereby possible to achieve press-hardening, in particular of the friction surfaces. - This is followed by the production of the driving
studs 11 and connectingstuds 14. Just like the centeringstuds 5 andindexing studs 6, these can initially be preformed by means of stamping and then be formed to their end contour in a single hot forming step, it being possible for press-hardening to be effected in each case. The driving stud side faces 11 a and the connecting web side faces 14 a can be hardened, if necessary, by the lateral application of contact pressure. - The method proposed according to the invention simplifies the production process significantly and makes it more cost-effective, in particular in the case of synchronizer rings. To this end, conventional cold forming steps can be combined with hot forming steps. The hot forming steps make it possible to achieve a high degree of forming. It is possible to replace a plurality of the cold forming substeps required for producing the same degree of forming with a single hot forming step. At the same time, it is possible to press-harden the respective functional surfaces with the hot forming step. As a whole, this results in a considerably reduced number of production steps. A costly downstream hardening process can be dispensed with.
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- 1 Outer ring
- 2 Intermediate ring
- 3 Inner ring
- 4 Toothing
- 5 Indexing stud
- 6 a Centering stud
- 6 a Centering stud side face
- 7 Driving tab
- 7 a Driving tab side face
- 8 First friction surface
- 9 Second friction surface
- 10 Third friction surface
- 11 Driving stud
- 11 a Driving stud side face
- 12 Fourth friction surface
- 13 Fifth friction surface
- 14 Connecting web
- 14 a Connecting web side face
Claims (18)
1. A method for producing a component of a synchronization device for a manual transmission, in particular a synchronizer ring, wherein a round blank produced from metal is formed in a plurality of forming steps,
wherein
at least one of the forming steps is a hot forming step in which the round blank is partially heated to a temperature of more than 600° C. and is then formed in the partially heated forming portion.
2. The method as claimed in claim 1 , wherein the round blank is produced by means of stamping.
3. The method as claimed in claim 1 , wherein at least one of the forming steps is a cold forming step.
4. The method as claimed in claim 1 , wherein the round blank is produced from steel.
5. The method as claimed in claim 1 , wherein the forming portion is heated to a temperature above the austenitization temperature.
6. The method as claimed in claim 1 , wherein the forming portion is at least partially quenched and consequently hardened.
7. The method as claimed in claim 1 , wherein the forming portion is quenched during forming and consequently hardened.
8. The method as claimed in claim 1 , wherein the round blank is partially heated by means of laser or induction.
9. The method as claimed in claim 1 , wherein the thermal energy required for partial heating is supplied to the forming portion in less than 3 seconds.
10. The method as claimed in claim 1 , wherein a cooled forming tool is used for quenching.
11. The method as claimed in claim 1 , one of the preceding claims, wherein the hot forming step is carried out as a cycle in a cyclic sequence of forming and/or stamping steps.
12. A component of a synchronization device for a manual transmission, in particular a synchronizer ring, comprising at least one press-hardened forming portion.
13. The component as claimed in claim 12 , wherein the press-hardened forming portion has one of the following configurations: toothing (4), indexing stud (5), centering stud (6), driving tab (7), driving stud (11), connecting web (14).
14. The method as claimed in claim 3 , wherein the cold forming step is deep drawing.
15. The method as claimed in claim 1 , wherein the round blank is produced from a steel alloy.
16. The method as claimed in claim 5 , wherein the forming portion is heated to a temperature of 850° C. to 1000° C.
17. The method as claimed in claim 6 , wherein the forming portion is consequently hardened by contact hardening.
18. The method as claimed in claim 9 , wherein the thermal energy required for partial heating is supplied to the forming portion in less than 1 second.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009021307A DE102009021307A1 (en) | 2009-05-14 | 2009-05-14 | Method for producing a component of a synchronization device for a manual transmission |
DE102009021307.4 | 2009-05-14 | ||
PCT/EP2010/002772 WO2010130366A1 (en) | 2009-05-14 | 2010-05-06 | Method for producing a component of a synchronization device for a manual transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120030929A1 true US20120030929A1 (en) | 2012-02-09 |
Family
ID=42773044
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/265,048 Abandoned US20120030929A1 (en) | 2009-05-14 | 2010-05-06 | Method for producing a component of a synchronization device for a manual transmission |
Country Status (8)
Country | Link |
---|---|
US (1) | US20120030929A1 (en) |
EP (1) | EP2429733B1 (en) |
CN (1) | CN102438768B (en) |
BR (1) | BRPI1010826A2 (en) |
DE (1) | DE102009021307A1 (en) |
ES (1) | ES2470672T3 (en) |
PL (1) | PL2429733T3 (en) |
WO (1) | WO2010130366A1 (en) |
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US20150304044A1 (en) * | 2014-02-13 | 2015-10-22 | Dali Systems Co. Ltd. | System and method for performance optimization in and through a distributed antenna system |
US20150354638A1 (en) * | 2014-06-05 | 2015-12-10 | Hoerbiger Antriebstechnik Holding Gmbh | Synchronizer ring for a synchronization unit of a manual transmission and method for manufacturing such synchronizer ring |
US20170073790A1 (en) * | 2014-03-25 | 2017-03-16 | Magna Powertrain Inc. | Method for forming power transmission components using heat-assisted calibration process and power transmission components made using method |
US20180073091A1 (en) * | 2016-09-15 | 2018-03-15 | Liebherr-Aerospace Lindenberg Gmbh | Tool For Realising A Press Quenching And Tempering Method |
CN107842563A (en) * | 2016-08-29 | 2018-03-27 | 麦格纳动力系有限公司 | The forming method with the part of spline and the part formed by unimach |
US10195694B2 (en) | 2012-07-27 | 2019-02-05 | Aktiebolaget Skf | Method for manufacturing a synchronizing ring and program |
US20200040426A1 (en) * | 2016-12-20 | 2020-02-06 | Arcelormittal | A method for manufacturing a thermally treated steel sheet |
CN113906229A (en) * | 2019-06-05 | 2022-01-07 | 宁波吉利汽车研究开发有限公司 | Synchronizer ring |
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US10195694B2 (en) | 2012-07-27 | 2019-02-05 | Aktiebolaget Skf | Method for manufacturing a synchronizing ring and program |
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US20170073790A1 (en) * | 2014-03-25 | 2017-03-16 | Magna Powertrain Inc. | Method for forming power transmission components using heat-assisted calibration process and power transmission components made using method |
US20150354638A1 (en) * | 2014-06-05 | 2015-12-10 | Hoerbiger Antriebstechnik Holding Gmbh | Synchronizer ring for a synchronization unit of a manual transmission and method for manufacturing such synchronizer ring |
KR20150140229A (en) * | 2014-06-05 | 2015-12-15 | 호르비거 안트립스테크닉 홀딩 게엠베하 | Synchronizer ring for synchronization unit of transmission gearbox and method for producing the synchronizer ring |
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KR102474484B1 (en) | 2014-06-05 | 2022-12-06 | 호르비거 안트립스테크닉 홀딩 게엠베하 | Synchronizer ring for synchronization unit of transmission gearbox and method for producing the synchronizer ring |
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US11719290B2 (en) * | 2019-06-05 | 2023-08-08 | Ningbo Geely Automobile Research & Development Co., Ltd. | Synchronizing ring |
Also Published As
Publication number | Publication date |
---|---|
WO2010130366A1 (en) | 2010-11-18 |
CN102438768A (en) | 2012-05-02 |
BRPI1010826A2 (en) | 2016-04-05 |
EP2429733B1 (en) | 2014-04-09 |
DE102009021307A1 (en) | 2011-01-05 |
ES2470672T3 (en) | 2014-06-24 |
PL2429733T3 (en) | 2014-08-29 |
EP2429733A1 (en) | 2012-03-21 |
CN102438768B (en) | 2014-11-26 |
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