闭口式机架为一整体铸件制成。型钢轧机的机架形式较多，常见的机架形式有开口式机架、闭口式机架和半闭口式机架3种。这种机架形式在型钢车间中小型轧机上应用较多。其优点是强度和刚度较高，辊跳值较小，产品精度较高。其主要缺点是制造比较困难，装卸、换辊不方便。轧制压力较大、对轧件尺寸要求比较严格时常采用闭口式机架。如初轧机、型钢连轧机和型钢成品轧机等。Theclosedframeismadeofawholecastings.Thistypeofframeisusedmoreinthe***allandmediummillinthesteelworkshop.Itsadvantagesarethatthestrengthandstiffnessarehigh,therolljumpvalueis***allandtheprecisionoftheproductishigh.Itsmaindisadvantageisthatitisdifficulttomanufacture,anditisinconvenienttoloadandloadandchangetheroll.Whentherollingpressureislargerandtherequirementsforthesizeoftherolledpiecearestrict,theclosedframeisoftenused.Suchastheearlyrollingmill,thetypesteelcontinuousrollingmillandthesteelfinishedrollingmill,etc.短应力线轧机具有如下优点：⑴容易实现负公差轧制，因为轧机的高刚度保证了产品的。⑵可实现轧机左右两个轴承的对称调整，这对于稳定轧制条件，提高作业率，节省检修和更换导卫、横梁时间等具有重要意义。Shortstresslinemillhasthefollowingadvantages:Itiseasytorealizenegativetolerancerollingmill,becauseofthehighrigiditytoensurehighprecisionproducts.Thesymmetricadjustmentcanachieveabouttworollingbearings,thestablerollingcondition,improveoperationefficiency,s***ingmaintenanceandreplacementhasimportantsignificancetoguideandbeamtimeetc.楔横轧机类型有辊式、板式和单辊弧式楔横轧机。三种类型的楔横轧机相比，板式楔横轧机模具制造较为简单，模具的调整比较容易，因而轧件的精度较高，并且工艺可靠.Thecrosswedgerollingmillhasrollertype,platetypeandsinglerollarccrosswedgerollingmill.Comparedwiththethreetypesofcrosswedgerollingmill,themouldmanufacturingoftheplatetypecrosswedgerollingmillissimplerandtheadjustmentofthedieiseasy,sotheprecisionoftheworkpieceishighandtheprocessisreliable.)