摘要:
A segmented female die for use in a closed die set comprising a pair of similar center segments and a pair of similar "half moon" shaped outside segments. The four segments also define the ejector pin opening. The die segments are prevented from relative motion between themselves by interlocks comprising closely mating protrusions and guideways which, in cooperation with other means, produce a rigid female die. The interlocks permit the use of relatively simple manufacturing techniques such as grinding as opposed to more sophisticated techniques such as electrical discharge machining.
摘要:
A manufacturing method for a connecting rod includes applying a tensile load to an end portion of the connecting rod as precompression in a cross direction that intersects with a longitudinal direction, the end portion being an longitudinal end portion of the connecting rod and having a through-hole, and fracture splitting the end portion into a rod portion and a cap portion by applying a tensile load to the end portion in the longitudinal direction in a state where the precompression is applied to the end portion.
摘要:
The present invention relates to an alloy steel for a mold tool and a mold using the same.The steel for the mold tool comprises iron (Fe) as a main component, an amount of about 0.35 to 0.45 wt % of carbon (C), amount of about 0.80 to 1.20 wt % of silicon (Si), amount of about 0.20 to 0.50 wt % of manganese (Mn), amount of about 6.00 to 8.00 wt % of chromium (Cr), amount of about 1.50 to 3.00 wt % of molybdenum (Mo), and amount of about 0.80 to 1.20 wt % of vanadium (V) based on the total weight of the tool steel. Accordingly, the mold tool have improved physical properties at high temperature and extended life span.
摘要:
Provided is a press forming method for a semi-solid material, including: a semi-solid material carrying step of carrying a semi-solid material into a lower die; a first press forming step of regulating, under a Z-direction regulation state in which a change in the Z direction's dimension corresponding to a pressing direction is regulated by an upper die, a change in one of the dimensions in X and Y directions by compressing the material with a transverse punch so that the one becomes equal to a dimension of the product, and then stopping the punch at a position of the compression; and a second press forming step of moving, under a state in which the change in the one is regulated in the above step, the upper die in the pressing direction to compress the material so that the Z direction's dimension becomes equal to the product's dimension.
摘要:
Exemplary connecting rods and methods of making a connecting rod are disclosed. A method of making a connecting rod may include the step of providing a connecting rod blank, where the connecting rod blank includes a crankshaft end and a piston pin end. The method may further include forming a crankshaft pin recess in the crankshaft end of the connecting rod blank and a piston pin recess in the piston pin end, and forming at least one lubrication recess in the piston pin end of the connecting rod blank. The lubrication recess and the piston pin recess may both formed concurrently.
摘要:
Exemplary connecting rods and methods of making a connecting rod are disclosed. A method of making a connecting rod may include the step of providing a connecting rod blank, where the connecting rod blank includes a crankshaft end and a piston pin end. The method may further include forming a crankshaft pin recess in the crankshaft end of the connecting rod blank and a piston pin recess in the piston pin end, and forming at least one lubrication recess in the piston pin end of the connecting rod blank. The lubrication recess and the piston pin recess may both formed concurrently.
摘要:
A connecting rod is a fracture split-type connecting rod made of an α+β type titanium alloy, including a rod main body and a big end provided at an end of the rod main body, the big end being fracture-split. The structure of the rod main body is an equiaxed α structure, and the structure of fractured surfaces of the big end is an acicular α structure.
摘要:
A presently-preferred process for manufacturing a connecting rod comprises placing a heated preform suitable for being formed into the connecting rod into a closed forge die, and forging the preform in a first forging operation while the preform is at a forging temperature to form an as-forged connecting rod having vertical flash extending therefrom. The presently-preferred process further comprises placing the as-forged connecting rod in a second forge die while the as-forged connecting rod is at a temperature substantially equal to the forging temperature, and forging the vertical flash in a second forging operation. The presently-preferred process also comprises removing the as-forged connecting rod from the second forge die, and machining the as-forged connecting rod to predetermined dimensions.
摘要:
A method of operating a forging press having a plurality of tool stages between which workpieces are advanced in succession. Each tool has two identical dies with a center-to-center spacing of half the stroke of a transporter for advancing the workpieces from stage to stage so that in each stage during each forging stroke of the press only one die is in contact with the workpiece while the other die is unused and in the next working stroke, the unused die engages the workpiece and the previously used die is unused. The result is a minimization of the contact time of workpieces with any given die and hence an increase in the life of the dies for a given press output or enhanced output of the press with equal or reduced die wear.