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There shall be no inclination in the unloading process of tensile parts and precautions in design and processing

  • Classification:News
  • Author:Runjie Hardware
  • Published on:2022-07-03 07:34:20
  • Visits:157

【Summary Description】1、 During the unloading process of carbon steel tensile parts, the inclined unloading plate can not take and unload the strip in the die. The unloading force is generally provided by elastic elements or hydraulic and pneumatic power devices. It is require

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There shall be no inclination in the unloading process of tensile parts and precautions in design and processing

【概要描述】1、 During the unloading process of carbon steel tensile parts, the inclined unloading plate can not take and unload the strip in the die. The unloading force is generally provided by elastic elements or hydraulic and pneumatic power devices. It is require

  • 分类:News
  • 作者:润杰五金
  • 发布时间:2022-07-03 07:34:20
  • 访问量:157
详情

<1>Carbon steel stretching parts shall not be inclined during unloading

The function of unloading plate in taking and unloading strip material in die.The unloading force is generally provided by elastic elements or hydraulic and pneumatic power devices.It is required that the unloading plate move smoothly and cannot tilt during the unloading process,otherwise it will cause unloading difficulties,accelerate the wear of punch and damage the die.In order to prevent uneven unloading force during unloading(easy to occur when unloading with spring and rubber elastic elements),guide elements are generally added to the unloading plate or shaft sleeves are used to fix the position of the unloading plate.Because the length of four or more shafts can be ground into the same size,the parallelism of the lower plane of the discharge plate to the upper plane of the female die is good,the discharge plate moves smoothly and bears better force,which is conducive to protecting the punch and improving the service life of the stamping and stretching parts.

The thickness of the discharge plate should not be too small

In the stamping process,the unloading plate has certain strength and stiffness requirements because it is not only affected by the unloading force and pressing force,but also by the impact force from the female die.For example,the unloading force of ordinary stamping is about 5%~8%of the punching force,and the unloading blank holder force during fine blanking is about 40%of the fine punching force.Therefore,this force is still large,which is easy to cause the deformation of the unloading plate and affect the normal operation of the die.That is,the thickness of the discharge plate should not be too small.

<2>Precautions for design and processing of stainless steel stretching parts

In order to improve the service performance of the mold,many hardware stretch parts manufacturers will analyze their molds and process them appropriately.Mold processing refers to the processing of molding and blank making tools.Therefore,the processing of large-scale injection mold also includes many aspects,such as gating system,molding part size,material selection and manufacturing,mold structure and action characteristics.According to the structural characteristics of large injection molds and some practical problems often encountered,the gating system,size and material selection of molds are often taken as the optimization objects.The following editor will explain the precautions for the design and processing of large stainless steel stretching parts:

1.Gating system

Due to the large process of plastic melt in large molds,whether the design of gating system is reasonable will directly affect the loss of melt pressure and temperature,filling process,pressure maintaining and feeding,internal stress of parts,weld marks and many other aspects.At the same time,it will also affect the internal and external quality of products and the stiffness and strength of molds.Therefore,gating system often becomes the main object of large-scale injection mold optimization.In the gating system,it mainly includes the optimization of the number and position of gates,the size and shape of main and shunt channels.

2.Die size

Generally speaking,for large-scale injection mold,its strength problem is not very big,mainly its stiffness,and rigid deformation will cause mold deformation and even mold damage.Therefore,the key parts and stressed parts of the die(such as cavity side wall,core backing plate,etc.)shall be determined strictly through technical calculation,and the corresponding simulation analysis can also be carried out if conditions permit.

3.Die material

The selection of die materials not only takes into account the specific requirements and machinability of the parts,but also its mechanical properties.Generally speaking,due to the complex structure of large-scale injection mold,the stress state of mold parts is also complex.During the use of many large molds,the fracture or crack of formed parts will often appear,which is closely related to the selection of materials and heat treatment.

4.Preparation of upper mold

1)First check whether the material is baked.If not,bake the material first.

2)Check whether the machine is empty,whether the size of the machine is appropriate,whether the ejection is appropriate,and whether the required special functions are available.If there is any failure,it will be reported immediately and wait for notification.

3)Check whether the mold is ready.If not,report it immediately and wait for notice.

4)When the above three points are ready,the upper mold tools,water pipes and corresponding equipment will be prepared.

5.Upper die steps

1)Pull the mold to the front of the corresponding machine,place it stably,screw on the corresponding lifting ring and confirm the thimble.

2)Lift the mold stably with the traveling crane and slowly put it into the machine to align the positioning ring of the machine and the mold.

3)Close the mold slowly and tightly.

4)Fasten the mold with the pressing plate,loosen the crane slowly and remove the crane,and take down the palladium again.

5)Raise the high pressure and lock the screw again and align the nozzle.

6)First check whether the mold is abnormal or the equipment to be before mold opening,and then open the mold slowly after confirmation.

7)After opening the mold,check whether the mold is abnormal again.

8)Find relevant personnel to connect special auxiliary equipment and debug it.

9)Install auxiliary equipment as required,such as water,forced pull,hot runner,etc.,and test whether these auxiliary equipment are normal.

10)Ready to power on.

6.Preparation for lower formwork

1)Stop the injection molding,inject the residual material of the screw,and clean the screw with PP material.

2)Turn off the corresponding water:ordinary water and water of mold temperature machine.

3)When all preparations are ready,the tools for lowering the mold and corresponding equipment will be prepared:bucket,antirust oil,lifting ring,crane,etc.

4)Find the corresponding department to remove the equipment to be removed before mold removal.

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