Patent ID: 7527756

Claim:
A mold temperature adjusting method using a high temperature fluid supply system ( 41 ) supplying a fluid of high temperature into a mold ( 2 ), a low temperature fluid tank ( 3 ), a low temperature fluid transfer pump ( 6 , 7 ), a low temperature fluid supply system ( 31 ) supplying the fluid into said mold ( 2 ) from said low temperature fluid tank ( 3 ), a low temperature fluid return system ( 35 ) returning the fluid into said low temperature fluid tank ( 3 ) from said mold ( 2 ) and a low temperature fluid by-pass system ( 40 ) connecting said low temperature fluid supply system ( 31 ) and said low temperature fluid return system ( 35 ) to each other so that a control of a mold temperature of said mold ( 2 ) is effected by a high temperature heat medium and low temperature heat medium predetermined temperatures being selectively caused to flow in a heat medium passage provided in said mold ( 2 ), wherein said mold temperature adjusting method includes the steps of: actually measuring a mold temperature of said mold ( 2 ); and while said mold ( 2 ) is heated, stopping supply of the high temperature heat medium into said mold ( 2 ) through said high temperature fluid supply system ( 41 ) when the mold temperature is elevated to a high temperature fluid stop temperature TH−ΔTH obtained by subtracting a heating over-shooting temperature correction value ΔTH from a predetermined resin filling start mold temperature TH and while said mold ( 2 ) is cooled, stopping supply of the low temperature heat medium into said mold ( 2 ) through said low temperature fluid supply system ( 31 ) when the mold temperature is lowered to a low temperature fluid stop temperature TL+ΔTL 1 obtained by adding a cooling under-shooting temperature correction value ΔTL 1 to a predetermined mold opening start temperature TL, said heating over-shooting temperature correction value ΔTH being a predicted elevated temperature value regulating a supply stop timing of the high temperature heat medium so that over-shooting of the mold temperature is suppressed, said cooling under-shooting temperature correction value ΔTL 1 being a predicted lowered temperature value regulating a supply stop timing of the low temperature heat medium so that under-shooting of the mold temperature is suppressed, wherein the supply of the high temperature heat medium into said mold ( 2 ) is started when the mold temperature is lowered to a high temperature heat medium supply start temperature set value TL+ΔTL 2 obtained by adding a high temperature heat medium supply start temperature correction value ΔTL 2 , which is smaller than the cooling under-shooting temperature correction value ΔTL 1 (ΔTL 2 <ΔTL 1 ), to the mold opening start temperature TL and the supply of the low temperature heat medium into said mold ( 2 ) is started when the mold temperature is elevated to the resin filling start mold temperature TH.