Housing body
A housing body ( 18 ) made from an invar alloy, with a recess ( 19 ) to accommodate a component ( 16 ) made from a material different from the invar alloy, has a thermal expansion coefficient that is approximately identical to that of the invar alloy. The housing body ( 18 ) has a cavity ( 24 ), which is produced by means of a cutting method and to which a high-pressure fluid can be fed in the required manner.
1 . A method for producing a housing body made from an invar alloy, comprising
accommodating a component made from a material that is different from the invar alloy in a recess of the housing body, the recess having a thermal expansion coefficient that is approximately identical to that of the invar alloy and
producing a cavity by means of a cutting method, wherein a high-pressure fluid can be fed to the cavity,
wherein the cavity has a wall and wherein the fluid acts on the cavity at least once for a predetermined time period at such a pressure that the yield point of the invar alloy is exceeded in the region of the wall.
2 . A method according to claim 1 , wherein a fluid at a pressure of at least 2500 bar acts at least once for a predetermined time period on the cavity.
3 . A housing body, comprising a recess accommodating a component made from a material that is different from the invar alloy, the recess having a thermal expansion coefficient that is approximately identical to that of the invar alloy, and
a cavity through which a high-pressure fluid can be fed,
wherein the cavity has a wall and wherein the fluid acts on the cavity at least once for a predetermined time period at such a pressure that the yield point of the invar alloy is exceeded in the region of the wall.
4 . A housing body according to claim 3 , wherein the invar alloy has a mean thermal expansion coefficient of maximum 2*10 −6 /K in a temperature range of 25° C. - 100° C.
5 . A method according to claim 1 , wherein the cutting method is drilling, milling, grinding or honing.
6 . A housing body according to claim 3 , wherein the cavity has a cylindrical cross-section.
7 . An actuator unit for an injection valve, with a housing body according to claim 3 , wherein the cavity is hydraulically linked to a high-pressure circuit to supply a fluid.
8 . An actuator unit for an injection valve according to claim 7 , wherein the component is an actuator.
9 . An actuator unit for an injection valve according to claim 8 , wherein the actuator is a piezo-electric actuator.
10 . An injection valve with a nozzle assembly and an actuator unit according to claims 7 , wherein the nozzle assembly and the actuator unit are linked together.
11 . A housing body, comprising a recess accommodating a component made from a material that is different from the invar alloy, the recess having a thermal expansion coefficient that is approximately identical to that of the invar alloy, and
a cavity through which a high-pressure fluid can be fed,
wherein the cavity has a wall wherein the wall has been treated by a fluid that acted on the cavity at least once for a predetermined time period at such a pressure that the yield point of the invar alloy is exceeded in the region of the wall.
12 . A housing body according to claim 11 , wherein the invar alloy has a mean thermal expansion coefficient of maximum 2*10 −6 /K in a temperature range of 25° C. - 100° C.
13 . A housing body according to claim 11 , wherein the cavity has a cylindrical cross-section.
14 . An actuator unit for an injection valve, with a housing body according to claim 11 , wherein the cavity is hydraulically linked to a high-pressure circuit to supply a fluid.
15 . An actuator unit for an injection valve according to claim 14 , wherein the component is an actuator.
16 . An actuator unit for an injection valve according to claim 15 , wherein the actuator is a piezo-electric actuator.
17 . An injection valve with a nozzle assembly and an actuator unit according to claims 14 , wherein the nozzle assembly and the actuator unit are linked together.