US 12,280,413 B2
Hot press forming apparatus and a method for hot press forming a blank
Lars Sandberg, Luleå (SE); Joakim Innala, Luleå (SE); and Petter Ulfberg, Luleå (SE)
Assigned to Autotech Engineering S.L., Bizkaia (ES)
Appl. No. 17/607,136
Filed by Autotech Engineering S.L., Bizkaia (ES)
PCT Filed Apr. 17, 2020, PCT No. PCT/SE2020/050396
§ 371(c)(1), (2) Date Oct. 28, 2021,
PCT Pub. No. WO2020/222688, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 1950511-4 (SE), filed on Apr. 29, 2019.
Prior Publication US 2022/0212242 A1, Jul. 7, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B21D 22/02 (2006.01); B21D 37/01 (2006.01)
CPC B21D 22/022 (2013.01) [B21D 37/01 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A hot press forming apparatus for forming a blank, the hot press forming apparatus comprising a first die and a second die, wherein the first die has at least one die cavity, and the second die has at least one die protrusion, the die protrusion of the second die being complementary to the die cavity of the first die, wherein the hot press forming apparatus is configured to, by means of the first and second dies, press form the blank placed between the first and second dies, wherein at least one of the first and second dies has a draw radius, wherein a polymer member is attached to the die which has the draw radius, wherein the polymer member comprises an adhesive tape having a first surface and a second surface, wherein the first surface of the adhesive tape forms a first press forming surface, and the second surface of the adhesive tape is provided with at least one adhesive substance, and wherein the second surface of the adhesive tape is attached to the die which has the draw radius by means of the at least one adhesive substance, at least a portion of the polymer member being positioned adjacent to or on the draw radius, wherein the die holding the polymer member defines a second press forming surface outside the first press forming surface, wherein during hot press forming, a first friction arises between the blank and the first press forming surface when the blank is in contact with the polymer member and a second friction arises between the blank and the second press forming surface when the blank is in contact with the die which holds the polymer member, the first friction being lower than the second friction.