句子翻译

The molds used for compression molding are classified into four basic types, namely, positive molds, landed positive molds, flash-type molds, and semipositive molds.

In order to harden and eject thermoplastic parts from the mold, cooling would be necessary.

There are seven basic chip formation processes: shaping, turning, milling, drilling, sawing, broaching, and grinding (abrasive machining).

In the injection mold, The screw（螺杆） acts as a combination injecting and plasticizing unit .
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The physcal composition of the workpiece greatly influences the selection of the machining method, the tool composition and geometry, and the rate of material removal.
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The clamping force that a machine is capable of exerting is part of the size designation and is measured in tons.
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Proper selection of the die material and of the die manufacturing technique determines, to a large extent, the useful life of forging dies.
In compression molding the plastic material as powder or performs is placed into a heated steel mold cavity.
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The guide pins, or posts, are mounted in the lower shoe.
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Plastic often contain other added materials called fillers.
When applying the electrical discharge machining process, the material is eroded as a result of electrical discharge between tool and work.
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Parts made by transfer molding have greater strengths, more uniform densities, closer dimensional tolerances, and the parting line requires less cleaning as compared with parts made by compression molding.
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The die blocks contain the movement mechanisms of the die and the inserts incorporating the casting form so that the assembly can be mounted between the tie bars of the machine.
In the early dawn civilization mankind discovered that a heated piece of metal was more easily hammered into different shapes.
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The tools necessary to produce a given forging cannot be made until the shape of the