Methods of manufacturing an extrusion die (100) having a plurality of pins (600a-c) and a plurality of slots (601) defined by the plurality of pins, each pin having a base, the method including applying a coating material (604) over side walls of the bases of the pins of the extrusion die and removing a portion of the coating material coated over the side walls of the bases of the plurality of pins with a cutting tool (650). In some embodiments, the cutting tool has a cutting width (652) equal to a target slot width (640) of the slots. In some embodiments, applying the coating material over the side walls of the bases of the pins includes overcoating a coating material to a thickness that is greater than a thickness needed to define a target slot width of the slots.

A fluid heating component including: a pillar-shaped member made of ceramics and formed with through channels through which a fluid passes, and a conductive coating layer disposed on at least a part of a circumferential surface of the pillar-shaped member, wherein the conductive coating layer is disposed on coats the whole circumference of a cut surface of the pillar-shaped member in a state where the conducive coating layer is electrically connected, in the cut surface of the pillar-shaped member which is perpendicular to a passing direction of the fluid.

An extrusion molding machine includes a molding portion having one end and other end, the one end having a die, the other end being connected to an extrusion port of an extrusion portion, the molding portion also including a screen arranged therein. The molding portion includes: two or more temperature controlling members between the screen and the die; and a heat insulating member arranged between the two or more temperature controlling members.

An electrical discharge machining (EDM) electrodes and associated methods are provided. An EDM electrode includes a holder rotatable about a rotation axis and a plurality of electrode elements attached to the holder and circumferentially arranged around the rotation axis. Respective positions of the electrode elements are radially adjustable relative to the rotation axis.

A honeycomb extrusion die (120) includes a die body (302) including an inlet face (306) and an exit face. The die body (302) has slot inlets (309) and a plurality of pins (320, 500) disposed between the slot inlets (309) and the exit face. The plurality of pins (320, 500) include side surfaces (322, 500B) configured to define a matrix of intersecting slots (324), wherein the matrix of intersecting slots (324) has slot exit (509) widths at the exit face. Divots (526) extend into a plurality of the side surfaces (322, 500B) between the slot inlets (309) and the exit face. Each individual divot (526) has a divot san depth (D55) extending into a side surface (500A, 500B, 502A, 502B) of the side surfaces (322, 500B). A ratio between a slot exit width (W53) W53 of an individual slot (324) and the divot depth (D55) of an individual divot (526) extending into a side surface (500A, 500B, 502A, 502B) of the individual slot (324) is greater than 1.2. Methods of forming honeycomb bodies with honeycomb structures are provided, as are other aspects.

A manufacturing method of a honeycomb structure including: a formed body forming step of extruding a forming raw material, to form a plurality of quadrangular prismatic columnar honeycomb formed bodies; a firing step of firing the honeycomb formed bodies, to form a plurality of quadrangular prismatic-columnar quadrangular segments; a triangular segment forming step to form a triangular prismatic-columnar triangular segment; a bonded body forming step to form a honeycomb bonded body; and a circumference grinding step to manufacture the honeycomb structure, wherein the bonded body forming step further includes: a pressurizing step of pressurizing the triangular segment from a circumferential direction of the temporary assembly toward a central direction thereof, by use of a pressurizing jig comprising a pressurizer.

A honeycomb structure (110) includes intersecting porous walls (106). Inlet channels (108i) and outlet channels (108o) are formed by the intersecting porous walls (106), wherein the inlet channels (108i) comprise inlet hydraulic diameters (HDi) and the outlet channels (108o) comprise outlet hydraulic diameters (HDo). The inlet channels (108i) comprise inlet corners (220i) with inlet corner radii (Ri) and the outlet channels (108o) comprise outlet corners (2200) with outlet corner radii (Ro). A centerpost (124) is defined by adjacent opposing inlet corners (220i) of two of the inlet channels (108i) and adjacent opposing outlet corners (2200) of two of the outlet channels (108o). A first diagonal length (D1) is a shortest distance between the opposing outlet corners (220o) of the two outlet channels (108o) and a second diagonal length (D2) is a shortest distance between the opposing inlet corners (220i) of the two inlet channels (108i). The honeycomb structure (110) has certain aspect ratios D1:D2 depending on hydraulic diameter ratios HDi:HDo.

A method for producing a ceramic molded body, the method including: a molding step of subjecting a ceramic molding material to extrusion molding using an extrusion molding machine equipped with a temperature control portion to provide a ceramic molded body; a cutting step of cutting the ceramic molded body to have a predetermined length; and a dimension measuring step of measure a dimension of the cut ceramic molded body. A relationship between a temperature of the temperature control portion and the dimension of the cut ceramic molded body is previously obtained, and based on the relationship, an appropriate temperature of the temperature control portion is calculated from the dimension of the ceramic molded body measured in the dimension measuring step, and the temperature control portion is controlled to the appropriate temperature in the molding step.

An extrusion die (16) including a plurality of pins (38) having side surfaces defining an intersecting array of slots (30) extending axially into the die (16) from a discharge face (34) of the die (16). A plurality of feedholes (28) extend axially from an inlet face (32) of the die (16) opposite to the discharge face (34). The feedholes (28) connect with the slots (30) at intersections (35) within the die (16) to create a flow path from the inlet face (32) to the discharge face (34). A first coating (42) is on at least a portion of the feedholes (28) in a first zone (46) extending over a first axial length of the flow path. A second coating (44) that is different than the first coating (42) is on at least a portion of the side surfaces (37) of the pins (38) in a second zone (48) extending over a second axial length of the flow path. Methods of fabricating an extrusion die (16) and manufacturing a ceramic article (100), such as a honeycomb body, are also disclosed.

A honeycomb extrusion die comprising at least some slots (308) each with a divot (312) spaced toward a discharge surface (324) from a feedhole-slot intersection (332) and a wide portion at the discharge surface extending into the die body (358) to the divot (312) to strengthen a peripheral region of a honeycomb extrudate in a reinforcement region, and a bulk nominal section corresponding to a bulk region of the honeycomb body.