Split body to mold a part
SOLIDWORKS Forums
4 days ago

I want to split this block to mold the part. But surface does not split the block. How to fix it?

 

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Categories: Modeling and Assemblies, Plastics and Mold Design

Comments
Last comment By: Brian Brazeau   Mon, 11 Feb 2019 17:06:31 GMT
Re: Split body to mold

It's probably because of the through holes and slots. You need to create shut off surfaces that split the cavity from the core inside the holes and slots. When the SW mold tools do this, they collect all the parting surfaces into one body, then all the +draft model faces into another surface body, and all the - draft model faces into another body, and then they have you create shut off surfaces. A shut off surface would be a planar, circular surface at the bottom of one of those mounting holes. When you split the mold block, you have to split it with a single surface, so you have to knit surface bodies together to do that. Then you have a single surface body that splits the + from the - side of the mold.

 

Here is an example of the cavity side of the part knit into a single surface body, with the green slot shut offs and yellow mounting hole shut offs.

By: Matt Lombard  Thu, 24 Jan 2019 17:38:56 GMT
Re: Split body to mold a part

Maha,

 

As Matt explained, you will want to use the Mold Tools available in SOLIDWORKS for the best results for the cavity and core. Check out our 3 part video on using the different Mold Tools...

 

SOLIDWORKS – Mold Tools Part 1 – Draft Analysis and Scale - YouTube

SOLIDWORKS - Mold Tools Part 2 - Split Line and Parting Line - YouTube

SOLIDWORKS – Mold Tools Part 3 – Shut Off-Parting Surfaces and Tooling Split - YouTube

 

~Ben

By: Benjamin Modic  Thu, 24 Jan 2019 18:17:47 GMT
Re: Split body to mold a part

All holes are closed by using geometry but split body popups error message. What is the reason?

 

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By: Maha Nadarasa  Thu, 24 Jan 2019 23:41:48 GMT
Re: Split body to mold a part

Maha,

I couldn't open your file in SW (I don't have 2019), but I opened in different program and shows 2 solids and 2 surfaces

Instead All bodies in the target, choose selected bodies and select only the square block

 

Why can't you try mold tools to split into core and cavity inserts, just curious?

By: JOHN GEORGE  Fri, 25 Jan 2019 14:01:31 GMT
Re: Split body to mold a part

For some parts mold tools will work, for some other it will not work. I do not have experience to decide which one is suitable for a particular part. 

By: Maha Nadarasa  Fri, 25 Jan 2019 14:13:49 GMT
Re: Split body to mold a part

Mold tools supposed to work on all molded parts (there may extreme exceptional cases)

This part is not that complicated to work with mold tools, if you follow the steps correctly (sometimes you may work with surface tools combined to get the final split surface)

By: JOHN GEORGE  Fri, 25 Jan 2019 14:26:49 GMT
Re: Split body to mold a part

You have to knit all the surfaces together to split. You can't split with a surface that doesn't include the shutoffs. Knit the parting surface to the + or - surfaces and the shutoff surfaces. Then split.

By: Matt Lombard  Fri, 25 Jan 2019 15:15:13 GMT
Re: Split body to mold a part

JOHN GEORGE

Solidworks "broke" the Tooling Split tool/command.  It now fails on things that have nothing wrong with them.  Mold Design is a very small percentage of Solidworks users, and the vast majority learned long ago that the "Solidworks way" of splitting a part is something to be avoided.  (The Parting Surfaces tool/command is complete junk.)  As a result, the majority of the Mold Designers neither know nor care that the Tooling Split tool/command is broken...we don't use it.  However, students have discovered the issue, since they are trying to do mold design the "right" way according to Solidworks.

By: Doug Seibel  Fri, 25 Jan 2019 16:41:24 GMT
Re: Split body to mold a part

Totally agree Doug. Like a fool I had a simple mold tool split last week and I thought surely the software wouldn't let me down. Yet again I was hit by a bug - it split fine but was useless unless you wanted to redefine planes and edges for the rest of your life on rebuilds when adding holes etc.

 

As you say, I can send these problems in but as it's a small percentage of users how far up the order of fixing is another story. Even with it classed as 'critical' on the spr.

By: Richard Gergely  Fri, 25 Jan 2019 18:42:07 GMT
Re: Split body to mold a part

Benjamin Modic wrote:

 

Maha,

 

As Matt explained, you will want to use the Mold Tools available in SOLIDWORKS for the best results for the cavity and core. Check out our 3 part video on using the different Mold Tools...

 

SOLIDWORKS – Mold Tools Part 1 – Draft Analysis and Scale - YouTube

SOLIDWORKS - Mold Tools Part 2 - Split Line and Parting Line - YouTube

SOLIDWORKS – Mold Tools Part 3 – Shut Off-Parting Surfaces and Tooling Split - YouTube

 

~Ben

SPR 896340 kind of kills the use of the standard mold functions. You don't know what model it might occur - complex or simple. By the time you find that it has occurred you are in a whole world of trouble.  Put holes on a surface as soon as the model rebuilds it doesn't recognise the surface. Redfine the surface works until a rebuild and then yet again it looses the reference to the surface. Reference a edge of the surface same again.

 

So in actual fact the safest way to split a tool is actually the way the OP has done it. OK he hasn't got it right but it is a safe method.

 

TBH all VAR's should know how flaky the mold tool splitting is at the moment. I can only hope it's fixed in 2019 sp at some point.

By: Richard Gergely  Fri, 25 Jan 2019 18:29:28 GMT
Re: Split body to mold a part

Can't open future version. Save as X_T and repost

By: Brian Brazeau  Fri, 01 Feb 2019 15:05:58 GMT
Re: Split body to mold a part

Parasolid file

By: Maha Nadarasa  Sat, 02 Feb 2019 18:48:50 GMT
Re: Split body to mold a part

Use combine feature in multi-body part

By: Brian Brazeau  Mon, 11 Feb 2019 17:06:31 GMT
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