32results about How to "Precise control of hot state size" patented technology

The invention discloses a thermal bulging process for flash-welded stainless steel ring workpieces, which includes steps of primary bulging; primary rotation; secondary rotation; secondary bulging and tertiary bulging. In the primary bulging, a flash-welded stainless steel ring workpiece which is annealed is sleeved on the periphery of a preheated bulging block in a bulging machine after being heated, and the bulging block squeezes the ring workpiece axially along the inner circumference of the ring workpiece after the bulging machine is started so that the primary bulging is completed, wherein the bulging temperature ranges from 950 DEG C to 1040 DEG C, the bulging time ranges from 22s to 28s, the pressure holding time ranges from 18s to 20s, and the bulging deflection ranges from 0.12% to 0.15%. The primary rotation is completed by rotating the ring workpiece along the center axis by 45 degrees. The secondary bulging is completed by processes of the primary bulging, wherein the bulging temperature ranges from 920 DEG C to 1010 DEG C, the bulging time ranges from 20s to 25s, the pressure holding time ranges from 16s to 18s, and the deflection ranges from 0.08% to 0.09%. The second rotation is completed by rotating the ring workpiece again along the direction the same with that of the primary rotation. The tertiary bulging is completed by the processes of the primary bulging again, wherein the bulging temperature ranges from 890 DEG C to 980 DEG C, the bulging time ranges from 25s to 30s, the pressure holding time ranges from 21s to 23s, and the deflection ranges from 0.09% to 1%. The dimensional precision of the ring workpiece can be 1%. to 2%. of the corresponding precision after the ring workpiece is bulged, and the ring workpiece is mainly used for the field of space navigation.

The invention discloses a hot bulging method for a rectangular bearing steel rolled ring; the hot bulging method comprises the following steps of: sleeving a rectangular bearing steel hot-rolled ring at the periphery of a preheated bulging block in a bulging machine, starting the bulging machine so that the bulging block extrudes the rolled ring along the radial direction on the surface of the inner circumference of the rolled ring to complete primary bulging, wherein the bulging temperature is 860 DEG C to 900 DEG C, the bulging time is 20s-30s, the pressure holding time is 12s-15s, and the deformation amount is 0.4%-0.7%; then leading the rolled ring to rotate by 45 degrees along a central axis to complete primary rotation; afterwards, carrying out secondary bulging according to the operation, wherein the bulging temperature is 830 DEG C to 870 DEG C, the bulging time is 25s-35s, the pressure holding time is 18s-22s, and the deformation amount is 0.6%-1%; rotating the rolled ring again to complete secondary rotation according to the primary rotation direction; and carrying out third bulging according to the operation, wherein the bulging temperature is 800 DEG C to 840 DEG C, the bulging time is 25-40s, the pressure holding time is 16s-20s, and the deformation amount is 0.6%-1.1%. The dimensional accuracy of the bulged rolled ring can reach 0.1%-0.2% of the corresponding dimension; and the bulged rolled ring is mainly applied to the fields of aerospace and the like.

The invention discloses a method for thermally bulging a high-temperature alloy rectangular ring rolled member. The method comprises the following steps of: sleeving a hot rolled high-temperature alloy rectangular ring rolled member on the periphery of a pre-heated bulged block in a bulging machine, and starting the bulging machine to enable the bulged block to extrude the ring rolled member from the inner circumferential surface of the ring rolled member in a radial direction, so that bulging for the first time is completed, wherein the bulging temperature is 800-850 DEG C, the bulging time is 20-30 s, the pressure maintaining time is 9-10 s, and the deformation is 0.6-0.8%; rotating the ring rolled member along a central axis for 45 DEG, so that rotating for the first time is completed; then, carrying out bulging for the second time according to the above operations, wherein the bulging temperature is 770-820 DEG C, the bulging time is 20-30 s, the pressure maintaining time is 17-18 s, and the deformation is 0.7-0.9%; rotating the ring rolled member again according to the first rotary direction, so that rotating for the second time is completed; and carrying out bulging for the third time according to the above operations, wherein the bulging temperature is 740-790 DEG C, the bulging time is 30-40 s, the pressure maintaining time is 25-28 s, and the deformation is 0.8-1%. The size precision of the bulged ring rolled member can be up to 0.001-0.002 of that of corresponding sizes. The ring rolled member disclosed by the invention is mainly applied to the fields, such as aerospace and the like.

The invention discloses a thermal bulging method for a high-temperature alloy flashing welding ring piece. The thermal bulging method comprises the following steps that: the high-temperature alloy flashing welding ring piece subjected to annealing treatment is heated and then sheathed on the periphery of a preheated bulging block in a bulging machine; the bulging machine is started to enable the bulging block to extrude the ring piece along the radial direction from the inner circumferential surface of the ring piece so as to complete the first bulging, wherein the bulging temperature is within 800 DEG C-950 DEG C, the bulging time is within 22s-28s, the pressure-holding time is within 10s-12s, and the deformation is within 0.6%-0.8%; the ring piece rotates by 45 degrees along the central axis to complete the first rotating; the second bulging is carried out according to the operation above, wherein the bulging temperature is within 770 DEG C-920 DEG C, the bulging time is within 25s-30s, the pressure-holding time is within 20s-22s, and the deformation is within 0.7%-0.9%; the second rotating is completed by rotating the ring piece again towards the direction the same as that of the first rotating; and the third bulging is carried out according to the operation process above, wherein the bulging temperature is within 740-890 DEG C, the bulging time is within 30s-40s, the temperature-holding time is within 26s-28s, and the deformation is within 0.8%-1%. The dimensional precision of the bulged ring piece can reach 0.1%-0.2% of the corresponding dimension, and the thermal bulging method is mainly applied to the field of space navigation.

The invention discloses a method for forming an irregular ring piece by utilizing a stainless-steel rectangular ring rolled piece through thermal bulging, comprising the following steps of: sleeving the heated stainless-steel rectangular ring rolled piece on the periphery of a pre-heated bulging blockin a bulging machine; starting the bulging machine so that the ring rolled piece is squeezed by the bulging block in a radial direction along the inner circumference surface of the ring rolled piece and becomes the irregular ring blank after being deformed for 11-13%, thus completing primary bulging; rotating the irregular ring blank for 45 degrees along an center axis, thus completing primary rotation; carrying out secondary bulging with the deformation amount of 1.8-2% and secondary rotation on the irregular ring blank according to the previous steps; carrying out tertiary bulging with the deformation amount of 1.4-1.6% and tertiary rotation on the irregular ring blank according to the previous steps; and carrying out quartus bulging with the deformation amount of 1.2-1.4% and quartus rotation on the irregular ring blank according to the previous steps, so as to obtain the irregular ring piece. The size precision of the irregular ring piece can reach 0.1-0.2% of the corresponding size. The irregular ring piece formed by using the method disclosed by the invention is mainly used for fields of aerospace and the like.

The invention discloses a thermal bulging process for rectangular titanium-alloy rolled ring workpieces, which includes steps of primary bulging; primary rotation; secondary rotation; secondary bulging and tertiary bulging. In the primary bulging, a rectangular titanium-alloy rolled ring workpiece which is treated by thermal rolling is sleeved on the periphery of a preheated bulging block in a bulging machine, and the bulging block squeezes the rolled ring workpiece axially along the inner circumference of the rolled ring workpiece after the bulging machine is started so that the primary bulging is completed, wherein the bulging temperature ranges from 780 DEG C to 830 DEG C, the bulging time ranges from 13s to 17s, the pressure holding time ranges from 10s to 12s, and the deflection ranges from 0.3% to 0.8%. The primary rotation is completed by rotating the rolled ring workpiece along the center axis by 45 degrees. The secondary bulging is completed by processes of the primary bulging, wherein the bulging temperature ranges from 750 DEG C to 800 DEG C, the bulging time ranges from 13s to 17s, the pressure holding time ranges from 10s to 12s, and the deflection ranges from 0.5% to 1%. The second rotation is completed by rotating the rolled ring workpiece again along the direction the same with that of the primary rotation. The tertiary bulging is completed by the processes of the primary bulging again, wherein the bulging temperature ranges from 700 DEG C to 770 DEG C, the bulging time ranges from 15s to 20s, the pressure holding time ranges from 12s to 14s, and the deflection ranges from 0.6% to 1%. The dimensional precision of the rolled ring workpiece can be 1%. to 2%. of the corresponding precision after the rolled ring workpiece is bulged, and the rolled ring workpiece is mainly used for the fields of space navigation and the like.