A method for assembling an insert with a recess of a structure, using a propulsion tool guiding a striker slide pushing a striker, and including a distributor device for controlling the forwards or backwards motion of the striker slide, and a tube guiding the striker and including a head with an internal profile adapted to the insert to be produced, a bar of material is inserted into the tube and heated to a predetermined temperature, a propulsion fluid is injected and a distributor slide is operated to move the striker slide at a predefined speed and to drive the striker to strike the preheated bar, force it into the recess and deform it so that it occupies the volume of the internal profile of the head.

In a forming apparatus, stationary journal dies (10U, 10B) and movable journal dies (11U, 11B) each hold and retain rough journal portions (J) of a preform blank (4) therebetween, and crank pin dies (12) contacts rough crank pin portions (P) thereof, and in this state, the movable journal dies (11U, 11B) are moved axially toward the stationary journal dies (10U, 10B) and the crank pin dies (12) are moved in the same axial direction and in an eccentric direction. Rough crank arm portions (A) are axially compressed to reduce their thickness to that of crank arms of a forged crankshaft, and the rough crank pin portions (P) are pressed in the eccentric direction to increase eccentricity to that of the crank pins of the forged crankshaft. Consequently, it is possible to form a blank for finish forging having a shape generally in agreement with the shape of the forged crankshaft.

In a forming apparatus, stationary journal dies (10U, 10B) and movable journal dies (11U, 11B) each hold and retain rough journal portions (J) of a preform blank (4) therebetween, and crank pin dies (12) contacts rough crank pin portions (P) thereof, and in this state, the movable journal dies (11U, 11B) are moved axially toward the stationary journal dies (10U, 10B) and the crank pin dies (12) are moved in the same axial direction and in an eccentric direction. Rough crank arm portions (A) are axially compressed to reduce their thickness to that of crank arms of a forged crankshaft, and the rough crank pin portions (P) are pressed in the eccentric direction to increase eccentricity to that of the crank pins of the forged crankshaft. Consequently, it is possible to form a blank for finish forging having a shape generally in agreement with the shape of the forged crankshaft.

The present invention discloses a process of manufacturing forged components using a combination of open die and closed die forging, and machining. The process involves the steps of cogging of the ingot, upsetting the cogged bloom in two steps to form a preform, closed forging the preform on a hammer, rough machining, heat treatment, semi-finishing, and finally finishing the component. The present invention is applicable to any forged components that are used in variety of industries, particularly those which are formed from large ingots. The invention is particularly useful for safety- and application-critical components such as a fluid end which is used in oil and gas industry. With the process of the present invention, 55 to 60% of the shape and size of the final component is achieved through forging and remaining 40 to 45% through machining. Incorporating the closed die forging stage in between open die forging and machining stages of the results in about 27% material reduction and over 60% reduction in machining time.

The present invention discloses a process of manufacturing forged components using a combination of open die and closed die forging, and machining. The process involves the steps of cogging of the ingot, upsetting the cogged bloom in two steps to form a preform, closed forging the preform on a hammer, rough machining, heat treatment, semi-finishing, and finally finishing the component. The present invention is applicable to any forged components that are used in variety of industries, particularly those which are formed from large ingots. The invention is particularly useful for safety- and application-critical components such as a fluid end which is used in oil and gas industry. With the process of the present invention, 55 to 60% of the shape and size of the final component is achieved through forging and remaining 40 to 45% through machining. Incorporating the closed die forging stage in between open die forging and machining stages of the results in about 27% material reduction and over 60% reduction in machining time.

A method of manufacturing an annular material includes: a forging process of making a discoid forged material by forging an alloy material; and a ring rolling process of making an annular material by performing ring rolling on an annular intermediate made by forming a through-hole in the forged material. In the forging process, hot forging which achieves an absolute value 1 of a strain in a circumferential direction of the forged material that is greater than or equal to 0.3, an absolute value h of a strain in a height direction of the forged material that is greater than or equal to 0.3, and a ratio h/1 between the absolute values of the strains that is in a range of 0.4 to 2.5 is performed at least two or more times.

Provided is a method for manufacturing an austenitic alloy steel material that can improve mechanical properties even without improving a composition of a steel material and an increase in the service life of a component in a high-pressure hydrogen environment can be expected. A method for manufacturing a precipitation-hardening austenitic alloy steel material, the method including: a hot forging step of providing a material for forging having a composition of the precipitation-hardening austenitic alloy steel material, and performing hot forging several times so that a total forging forming ratio is 30 or more, to form a forged material. The method preferably includes a heat treatment step of additionally subjecting the forged material to a solution treatment and an aging treatment, to obtain a heat-treated steel material.

Provided is a method for fabricating a stepped forged material that can realize a uniform microscopic structure in both the large diameter flange portion and the small diameter shaft portion. This method for fabricating a stepped forged material comprises the following steps: a step for obtaining a primary forged material in which an austenite stainless steel billet is heated to 1000-1080 C., and, without any further heating, the material is forged by means of reciprocal forging into a round rod having along the entire length thereof a forging ratio of 1.5 or greater; a step for obtaining a secondary forged material, that forms the large diameter flange portion and the small diameter shaft portion, in which without reheating, the small diameter shaft portion is formed by means of reciprocal forging at a temperature where the surface temperature of the primary forged material never falls more than 200 C. lower than the abovementioned material heating temperature and the forging is completed before the surface temperature of the final forged portion falls more than 300 C. lower than the abovementioned heating temperature; and a step for performing a solution heat treatment in which the secondary forged material is heated to 1040-1100 C. for 30 minutes or longer.

Provided is a method for fabricating a stepped forged material that can realize a uniform microscopic structure in both the large diameter flange portion and the small diameter shaft portion. This method for fabricating a stepped forged material comprises the following steps: a step for obtaining a primary forged material in which an austenite stainless steel billet is heated to 1000-1080 C., and, without any further heating, the material is forged by means of reciprocal forging into a round rod having along the entire length thereof a forging ratio of 1.5 or greater; a step for obtaining a secondary forged material, that forms the large diameter flange portion and the small diameter shaft portion, in which without reheating, the small diameter shaft portion is formed by means of reciprocal forging at a temperature where the surface temperature of the primary forged material never falls more than 200 C. lower than the abovementioned material heating temperature and the forging is completed before the surface temperature of the final forged portion falls more than 300 C. lower than the abovementioned heating temperature; and a step for performing a solution heat treatment in which the secondary forged material is heated to 1040-1100 C. for 30 minutes or longer.

A method of manufacturing an iron type golf club head, including forming an iron type golf club head blank, the iron type golf club head blank having an oversized hosel portion and an oversized body portion, the iron type golf club head blank configured to accommodate a plurality of iron type golf club heads, each iron type golf club head having a unique loft angle; and removing material from said oversized body portion of said iron type golf club head blank.