Understanding Injection Mold Design
1st Edition
Published on 18. March 2013
100 pages
978-3-446-40183-9 (ISBN)
Description
Today, most molders, but also many mold makers specialize in certain areas. There are specialists for thin wall molding, screw caps, large beverage container crates, pre-forms for PET bottles, small gears, and many others. But regardless of size and type of the product to be injection molded, whether small or large, with single or multiple cavities, or who designs or builds the mold, the basic mold design principles are always the same.
These basic design principles for good mold design are the focus of this text. The designer will not find elaborate drawings of existing molds, instead he/she will learn about the many factors, which must be considered when successfully designing a mold.
Contents:
Starting New in the Mold Design Field
Basics of the Injection Molding Machine
Understanding the Basics of the Injection Mold
Before Starting to Design a Mold
Review and Follow-Up
Typical Examples
Estimating Mold Costs
Machining, Mold Materials, and Heat Treatment
These basic design principles for good mold design are the focus of this text. The designer will not find elaborate drawings of existing molds, instead he/she will learn about the many factors, which must be considered when successfully designing a mold.
Contents:
Starting New in the Mold Design Field
Basics of the Injection Molding Machine
Understanding the Basics of the Injection Mold
Before Starting to Design a Mold
Review and Follow-Up
Typical Examples
Estimating Mold Costs
Machining, Mold Materials, and Heat Treatment
More details
Other editions
Additional editions
Herbert Rees
Understanding Injection Mold Design
Book
04/2001
1st Edition
Hanser
€69.99
Article exhausted; check different version
Content
1 - Introduction to the Series [Seite 6]
2 - Preface [Seite 8]
3 - Contents [Seite 10]
4 - 1 Introduction [Seite 14]
4.1 - 1.1 Economics of Mold Design [Seite 16]
5 - 2 Starting New in the Mold Design Field [Seite 18]
6 - 3 The Basics of an Injection Molding Machine [Seite 20]
7 - 4 Understanding the Basics of the Injection Mold [Seite 22]
7.1 - 4.1 Design Rules [Seite 22]
7.2 - 4.2 The Basic Mold [Seite 22]
7.2.1 - 4.2.1 Mold Cavity Space [Seite 22]
7.2.2 - 4.2.2 Number of Cavities [Seite 23]
7.2.3 - 4.2.3 Cavity Shape and Shrinkage [Seite 24]
7.3 - 4.3 Cavity and Core [Seite 24]
7.4 - 4.4 The Parting Line [Seite 25]
7.4.1 - 4.4.1 Split Molds and Side Cores [Seite 26]
7.5 - 4.5 Runners and Gates [Seite 27]
7.6 - 4.6 Projected Area and Injection Pressure [Seite 28]
7.6.1 - 4.6.1 Clamping Force [Seite 29]
7.6.2 - 4.6.2 Strength of the Mold [Seite 29]
7.6.3 - 4.6.3 Why Are High Injection Pressures Needed? [Seite 30]
7.7 - 4.7 Venting [Seite 31]
7.8 - 4.8 Cooling [Seite 31]
7.8.1 - 4.8.1 Basics of Cooling [Seite 32]
7.8.2 - 4.8.2 Plate Cooling [Seite 35]
7.9 - 4.9 Ejection [Seite 35]
7.9.1 - 4.9.1 Automatic Molding [Seite 38]
7.10 - 4.10 Shrinkage [Seite 39]
7.10.1 - 4.10.1 Variable Shrinkage [Seite 39]
7.11 - 4.11 Alignment [Seite 40]
7.11.1 - 4.11.1 No Provision for Alignment [Seite 40]
7.11.2 - 4.11.2 Leader Pins and Bushings [Seite 41]
7.11.3 - 4.11.3 Taper Lock Between Each Cavity and Core [Seite 42]
7.11.4 - 4.11.4 Taper Locks and Wedges [Seite 43]
7.11.5 - 4.11.5 Taper Pins [Seite 44]
7.11.6 - 4.11.6 Too Many Alignment Features [Seite 44]
8 - 5 Before Starting to Design a Mold [Seite 46]
8.1 - 5.1 Information and Documentation [Seite 46]
8.1.1 - 5.1.1 Is the Product Design Ready? [Seite 46]
8.1.2 - 5.1.2 Are the Tolerances Shown? [Seite 46]
8.1.3 - 5.1.3 Are the Tolerances Reasonable? [Seite 47]
8.1.4 - 5.1.4 What are the Cycle Times? [Seite 47]
8.1.5 - 5.1.5 What is the Expected Production? [Seite 47]
8.1.6 - 5.1.6 What are the Machine Specifications? [Seite 48]
8.2 - 5.2 Start of Mold Design [Seite 55]
8.2.1 - 5.2.1 Mold Shoes [Seite 55]
8.2.2 - 5.2.2 Mold Drawings [Seite 58]
8.2.3 - 5.2.3 The Stack Layout [Seite 61]
8.2.4 - 5.2.4 Selection of a Suitable Runner System [Seite 69]
8.2.5 - 5.2.5 Venting [Seite 78]
8.2.6 - 5.2.6 Ejection [Seite 81]
8.2.7 - 5.2.7 Cooling [Seite 82]
8.2.8 - 5.2.8 Alignment of Stack [Seite 86]
8.2.9 - 5.2.9 Design Review [Seite 86]
8.3 - 5.3 Preload [Seite 86]
8.4 - 5.4 Mold Materials Selection [Seite 87]
8.4.1 - 5.4.1 Effect of Expected Production [Seite 88]
8.4.2 - 5.4.2 Forces in Molds [Seite 88]
8.4.3 - 5.4.3 Characteristics of Steels and Other Mold Materials [Seite 88]
8.5 - 5.5 Stack Molds [Seite 91]
8.6 - 5.6 Mold Layout and Assembly Drawings [Seite 92]
8.6.1 - 5.6.1 Machine Platen Layout [Seite 92]
8.6.2 - 5.6.2 Symmetry of Layout, Balancing of Clamp [Seite 92]
8.6.3 - 5.6.3 The Views [Seite 93]
8.6.4 - 5.6.4 Completing the Assembly Drawing [Seite 93]
8.6.5 - 5.6.5 Bill of Materials (BoM) and "Ballooning" [Seite 94]
8.6.6 - 5.6.6 Finishing Touches [Seite 94]
9 - 6 Review and Follow-Up [Seite 95]
10 - 7 Typical Examples [Seite 96]
10.1 - 7.1 Containers or Other Cup-Shaped Products [Seite 96]
10.2 - 7.2 Technical Products [Seite 100]
10.3 - 7.3 Mold with Fixed Cores [Seite 101]
10.4 - 7.4 Mold with Floating Cores [Seite 102]
10.5 - 7.5 Molds with Side Cores or Splits [Seite 103]
11 - 8 Estimating Mold Cost [Seite 105]
11.1 - 8.1 Need for Estimate [Seite 105]
11.2 - 8.2 Precedents [Seite 106]
11.3 - 8.3 No Precedents [Seite 106]
11.4 - 8.4 Methods of Estimating [Seite 107]
11.5 - 8.5 Mold Cost and Mold Price [Seite 108]
12 - 9 Machining, Mold Materials, and Heat Treatment [Seite 110]
12.1 - 9.1 Machining of Mold Components [Seite 110]
12.2 - 9.2 Materials Selection [Seite 114]
12.2.1 - 9.2.1 Steel Properties [Seite 115]
12.3 - 9.3 Heat Treatment [Seite 119]
13 - Appendix 1 CAD/CAM (Computer- Assisted Design-Computer- Assisted Manufacturing) [Seite 121]
14 - Index [Seite 124]
2 - Preface [Seite 8]
3 - Contents [Seite 10]
4 - 1 Introduction [Seite 14]
4.1 - 1.1 Economics of Mold Design [Seite 16]
5 - 2 Starting New in the Mold Design Field [Seite 18]
6 - 3 The Basics of an Injection Molding Machine [Seite 20]
7 - 4 Understanding the Basics of the Injection Mold [Seite 22]
7.1 - 4.1 Design Rules [Seite 22]
7.2 - 4.2 The Basic Mold [Seite 22]
7.2.1 - 4.2.1 Mold Cavity Space [Seite 22]
7.2.2 - 4.2.2 Number of Cavities [Seite 23]
7.2.3 - 4.2.3 Cavity Shape and Shrinkage [Seite 24]
7.3 - 4.3 Cavity and Core [Seite 24]
7.4 - 4.4 The Parting Line [Seite 25]
7.4.1 - 4.4.1 Split Molds and Side Cores [Seite 26]
7.5 - 4.5 Runners and Gates [Seite 27]
7.6 - 4.6 Projected Area and Injection Pressure [Seite 28]
7.6.1 - 4.6.1 Clamping Force [Seite 29]
7.6.2 - 4.6.2 Strength of the Mold [Seite 29]
7.6.3 - 4.6.3 Why Are High Injection Pressures Needed? [Seite 30]
7.7 - 4.7 Venting [Seite 31]
7.8 - 4.8 Cooling [Seite 31]
7.8.1 - 4.8.1 Basics of Cooling [Seite 32]
7.8.2 - 4.8.2 Plate Cooling [Seite 35]
7.9 - 4.9 Ejection [Seite 35]
7.9.1 - 4.9.1 Automatic Molding [Seite 38]
7.10 - 4.10 Shrinkage [Seite 39]
7.10.1 - 4.10.1 Variable Shrinkage [Seite 39]
7.11 - 4.11 Alignment [Seite 40]
7.11.1 - 4.11.1 No Provision for Alignment [Seite 40]
7.11.2 - 4.11.2 Leader Pins and Bushings [Seite 41]
7.11.3 - 4.11.3 Taper Lock Between Each Cavity and Core [Seite 42]
7.11.4 - 4.11.4 Taper Locks and Wedges [Seite 43]
7.11.5 - 4.11.5 Taper Pins [Seite 44]
7.11.6 - 4.11.6 Too Many Alignment Features [Seite 44]
8 - 5 Before Starting to Design a Mold [Seite 46]
8.1 - 5.1 Information and Documentation [Seite 46]
8.1.1 - 5.1.1 Is the Product Design Ready? [Seite 46]
8.1.2 - 5.1.2 Are the Tolerances Shown? [Seite 46]
8.1.3 - 5.1.3 Are the Tolerances Reasonable? [Seite 47]
8.1.4 - 5.1.4 What are the Cycle Times? [Seite 47]
8.1.5 - 5.1.5 What is the Expected Production? [Seite 47]
8.1.6 - 5.1.6 What are the Machine Specifications? [Seite 48]
8.2 - 5.2 Start of Mold Design [Seite 55]
8.2.1 - 5.2.1 Mold Shoes [Seite 55]
8.2.2 - 5.2.2 Mold Drawings [Seite 58]
8.2.3 - 5.2.3 The Stack Layout [Seite 61]
8.2.4 - 5.2.4 Selection of a Suitable Runner System [Seite 69]
8.2.5 - 5.2.5 Venting [Seite 78]
8.2.6 - 5.2.6 Ejection [Seite 81]
8.2.7 - 5.2.7 Cooling [Seite 82]
8.2.8 - 5.2.8 Alignment of Stack [Seite 86]
8.2.9 - 5.2.9 Design Review [Seite 86]
8.3 - 5.3 Preload [Seite 86]
8.4 - 5.4 Mold Materials Selection [Seite 87]
8.4.1 - 5.4.1 Effect of Expected Production [Seite 88]
8.4.2 - 5.4.2 Forces in Molds [Seite 88]
8.4.3 - 5.4.3 Characteristics of Steels and Other Mold Materials [Seite 88]
8.5 - 5.5 Stack Molds [Seite 91]
8.6 - 5.6 Mold Layout and Assembly Drawings [Seite 92]
8.6.1 - 5.6.1 Machine Platen Layout [Seite 92]
8.6.2 - 5.6.2 Symmetry of Layout, Balancing of Clamp [Seite 92]
8.6.3 - 5.6.3 The Views [Seite 93]
8.6.4 - 5.6.4 Completing the Assembly Drawing [Seite 93]
8.6.5 - 5.6.5 Bill of Materials (BoM) and "Ballooning" [Seite 94]
8.6.6 - 5.6.6 Finishing Touches [Seite 94]
9 - 6 Review and Follow-Up [Seite 95]
10 - 7 Typical Examples [Seite 96]
10.1 - 7.1 Containers or Other Cup-Shaped Products [Seite 96]
10.2 - 7.2 Technical Products [Seite 100]
10.3 - 7.3 Mold with Fixed Cores [Seite 101]
10.4 - 7.4 Mold with Floating Cores [Seite 102]
10.5 - 7.5 Molds with Side Cores or Splits [Seite 103]
11 - 8 Estimating Mold Cost [Seite 105]
11.1 - 8.1 Need for Estimate [Seite 105]
11.2 - 8.2 Precedents [Seite 106]
11.3 - 8.3 No Precedents [Seite 106]
11.4 - 8.4 Methods of Estimating [Seite 107]
11.5 - 8.5 Mold Cost and Mold Price [Seite 108]
12 - 9 Machining, Mold Materials, and Heat Treatment [Seite 110]
12.1 - 9.1 Machining of Mold Components [Seite 110]
12.2 - 9.2 Materials Selection [Seite 114]
12.2.1 - 9.2.1 Steel Properties [Seite 115]
12.3 - 9.3 Heat Treatment [Seite 119]
13 - Appendix 1 CAD/CAM (Computer- Assisted Design-Computer- Assisted Manufacturing) [Seite 121]
14 - Index [Seite 124]
