Method for producing an injector body and corresponding injector body
View Patent ↗A nozzle body has a first nozzle body element ( 1 ) and a second nozzle body element ( 3 ). The first nozzle body element ( 1 ) is provided with a first nozzle-needle recess ( 10 ) accommodating an nozzle-needle ( 15 ) and a first guide area ( 8 ) for the nozzle-needle ( 15 ). In a first process step, the first nozzle body element ( 1 ) is assembled with the second nozzle body element ( 3 ). Brazing solder having a working temperature in the range of the tempering temperature of the first nozzle body element ( 1 ) is supplied to an assembly area ( 5 ). The assembly area ( 5 ) is defined between the second nozzle body element ( 3 ) and the first nozzle body element ( 1 ). The assembled first nozzle body element ( 1 ) and second nozzle body element ( 3 ) is subjected to tempering during which the tempering temperature of the first nozzle body element ( 1 ) is reached.
1. A method of manufacturing a nozzle body, which comprises a first nozzle-body part and a second nozzle-body part, wherein the first nozzle-body part is formed from a hardenable material having a hardening temperature, and wherein in the first nozzle-body part a first nozzle-needle recess for receiving a nozzle needle and a first guide region for the nozzle needle are formed, the method comprising the steps of:
assembling the first nozzle-body part with the second nozzle-body part, wherein an assembly region is developed between the second nozzle-body part and the first nozzle-body part, the assembly region including an interference fit between respective first portions of the first and second nozzle-body parts and a gap between respective second portions of the first and second nozzle-body parts, the gap extending from the interference fit to an opening, the gap being sized to promote capillary action of a melted brazing solder into the gap,
feeding brazing solder having a working temperature in the region of the hardening temperature of the first nozzle-body part to the assembly region, and
subjecting the assembled first nozzle-body part and second nozzle-body part to a hardening operation, during which the hardening temperature of the first nozzle-body part is reached, wherein during the hardening operation the brazing solder melts and flows into the gap due to capillary action,
such that the first and second nozzle-body parts are joined by a dual-type connection including (a) the interference fit between the respective first portions of the first and second nozzle-body parts and (b) the brazed connection across the gap between the respective second portions of the first and second nozzle-body parts.
2. The method according to claim 1 , wherein the second nozzle-body part is manufactured from an eminently weldable high-grade steel and the first nozzle-body part is manufactured from an eminently hardenable high-grade steel.
3. The method according to claim 1 , wherein a nozzle-needle guide body is introduced prior to the hardening operation into the second nozzle-body part.
4. The method according to claim 3 , wherein the nozzle-needle guide body is introduced with an interference fit into the second nozzle-body part.
5. The method according to claim 1 , wherein the hardening temperature lies in a range of 1000 to 1100° C.
6. The method according to claim 1 , wherein the hardening is effected at a low oxygen partial pressure.
7. The method according to claim 1 , wherein the brazing solder is fed in the form of brazing paste globules to the assembly region.
8. A nozzle body comprising:
a first nozzle-body part and a second nozzle-body part, wherein the first nozzle-body part is formed from a hardenable material having a hardening temperature, and wherein in the first nozzle-body part a first nozzle needle recess for receiving a nozzle needle and a first guide region for the nozzle needle are formed,
an assembly region, which is formed between the second nozzle-body part and the first nozzle-body part, the assembly region including an interference fit between respective first portions of the first and second nozzle-body parts and a gap between respective second portions of the first and second nozzle-body parts, the gap extending from the interference fit to an opening, the gap being sized to promote capillary action of a melted brazing solder into the gap, and
a brazing solder connection, which is formed in the assembly region and the working temperature of which lies in the region of the hardening temperature of the first nozzle-body part such that the brazing solder melts and flows into the gap due to capillary action,
such that the first and second nozzle-body parts are joined by a dual-type connection including (a) the interference fit between the respective first portions of the first and second nozzle-body parts and (b) the brazed connection across the gap between the respective second portions of the first and second nozzle-body parts.
9. The nozzle body according to claim 8 , wherein the second nozzle-body part is manufactured from an eminently weldable high-grade steel and the first nozzle-body part is manufactured from an eminently hardenable high-grade steel.
10. The nozzle body according to claim 8 , further comprising a nozzle-needle guide body.
11. The nozzle body according to claim 10 , wherein the nozzle-needle guide body is introduced with an interference fit into the second nozzle-body part.
12. The nozzle body according to claim 8 , wherein the hardening temperature lies in a range of 1000 to 1100° C.
13. The nozzle body according to claim 8 , wherein the hardening is effected at a low oxygen partial pressure.
14. The nozzle body according to claim 8 , wherein the brazing solder is fed in the form of brazing paste globules to the assembly region.