Design of an injection mould

1 Bachelor’s Degree in Mechanical Engineering Final Degree Project DESIGN OF AN INJECTION MOULD TECHNICAL REPORT AUTOR: DANIEL PÉREZ GARCIA DIRECTOR: MIGUEL SÁNCHEZ-SOTO 2 Index 1.- Introduction ......................................................................................................................... 4 2.-Objectives ............................................................................................................................ 5 3.- Scope................................................................................................................................... 6 4.- Background ......................................................................................................................... 6 5.- Part description .................................................................................................................. 7 5.1-Introduction .................................................................................................................... 7 5.2-Requirements ................................................................................................................ 7 5.3-Part overview and ubication ........................................................................................ 8 5.4-Requirements for moulding ......................................................................................... 8 6.- Materials ............................................................................................................................ 12 POLYPROPYLENE BC250MO ....................................................................................... 12 RIGID POLYVINYL CHLORIDE M4820 ........................................................................ 13 HIGH DENSITY POLYETHYLENE ERACLENE MP90U ............................................ 14 6.1.-Material selection ....................................................................................................... 15 7.Mould design ....................................................................................................................... 18 7.1.- Part ubication ............................................................................................................ 19 7.2.- Mould cycle................................................................................................................ 21 7.2.1.- Initial position ......................................................................................................... 21 7.2.2.- Injection .................................................................................................................. 21 7.2.3.- Mould opening ....................................................................................................... 23 7.2.4.- Part ejection ........................................................................................................... 25 7.2.5.- End of cycle............................................................................................................ 26 7.3.- Casting system ......................................................................................................... 27 7.4.- Cooling system ......................................................................................................... 27 8.- Environment ..................................................................................................................... 29 3 8.- Conclusions ...................................................................................................................... 31 9.- Bibliography ...................................................................................................................... 32 Catalogs .............................................................................................................................. 32 Websites ............................................................................................................................. 32 Books................................................................................................................................... 33 References ......................................................................................................................... 33 4 1.- Introduction The design of a plastic part is a complex task that requires a deep knowledge of different concepts of materials science, and especially about the particular behavior of plastics both in the molten or solid state. However, one of the main problems associated to the manufacture of plastics components is the need of special tooling such as moulds for the case of the injection moulding process. The injection moulding process consist in introducing a plastic material in the molten state by means of a pressure inside a mould. The main purpose of the mould is in the one hand to give the shape to the component and on the other hand to cool it until a temperature in which the shape is retained. In this moment, the part is extracted from the mould, usually following an automatic mode. Plastic components made by injection moulding are usually cheap and are designed for being produced in large quantities. In such a way, the cost of the tooling can be recovered without a substantial increase in the cost of the component. Therefore, mould became a key issue in the manufacture of plastic parts. A well-designed mould should be capable of producing a large amount of parts without requiring extensive maintenance and assuring that all manufactured components are identical in terms of properties. For this to be ensured it has to follow a very thorough process of design, making sure the parameters set are strictly carried over when fabricating the mould. 5 2.-Objectives The main objective of the present project is the design of a mold suitable for producing the T- shaped fitting component at the quality level required by the costumer. This project also includes the design of the T- fitting and the selection of the components required to make the mold. Moreover, a preliminary selection of the plastic family will be also carried out. The procedure followed to select the different construction solutions for the mold will be also discussed in detail. Finally, a budget will be realized to evaluate the economic viability of the project, as well as giving information about the amortization of the mould. 6 3.- Scope The normal progress of a project like this ends up with the realization of it. Due to the impossibility of doing so because the costs cannot be afforded the project will stop on its hypothetical phase. The study for choosing materials for the part, the design of the mould and the economical aspects will be carried over, with some guidance for the next steps. 4.- Background The motivation for carrying out this project is a request from the company KAERCHER, done by the home & garden business division. The company had been leading the market for over a decade but recently they registered a negative tendency on sales, due to an increasingly competitive market and higher material costs. To reconduct the negative tendency they are launching a new set of automatic watering system. They have made the whole system lighter, cheaper and more efficient. The system consists on the following: Irrigation programmer Connectors Hoses Due to the renewed design they need new connectors and have offered a contract for been provided with 100000 spare parts a year. 7 5.- Part description 5.1-Introduction A fitting is normally used in pipe systems to connect straight pipe or tubing sections, adapt to different sizes or shapes and for other purposes, such as regulating (or measuring) fluid flow. Rather than focusing on all the subtypes of fittings, the focus will be on tees. A tee is the most common pipe fitting is used to combine or divide fluid flow. It can be threaded with female thread sockets, solvent-weld sockets or opposed solvent-weld sockets and a female-threaded side outlet, etc. Tees can also connect pipes of different diameters. They are available in a variety of materials sized and finishes. Most common materials include carbon and galvanized steel, impact-tested carbon steel, low-temperature carbon steel, stainless steel, malleable iron, copper, incoloy, ABS, FRP, PVC, HDPE and toughened glass. 5.2-Requirements The main function of the t-fitting will be to connect several hoses. It will be supporting low pressure water ( coming from the pipes ). The part will be supporting 4-5 bar of pressure coming from the pipes. Due to the pressure being low, any of the materials listed above will ensure that the tee will endure the stress generated by the pressure. 8 5.3-Part overview and ubication The purpose of this T-fitting will be to bifurcate the flow of water coming from the automatic watering system and to connect 3 different hoses enabling the water to arrive to every possible nook. The part overview is the following: Fig.1 - 3D shape of the part 5.4-Requirements for moulding Before designing the mould it’s needed to study the geometry of the part to decide how to ubicate it on the mould. 9 Fig.2 – Part dimensions With the measurements done the ubication can be set on the mould. The part is small enough to fabricate several simultaneously. The layout proposed is a symmetric, 4-part design. Symmetric layouts are simpler to fabricate, since it requires less effort for the worker who will give shape to the mould, because he/she will have less measurements to make. 16 PVC seems to be the go to material, following the fig.4 data. But to push a bit further, 2 graphics will be presented to smooth the choosing. First graph shows the quality score vs material and the second one the quality vs cost. DEGREE OF IMPORTANCE PVC PP HDPE Easy to inject 9 3 3 3 Chemical resistance 6 2 1 1 Toughness 7 3 1 2 Hardness 5 3 1 2 Density 9 0 2 3 Price 9 3 1 1 Easy to recycle 7 2 3 2 QUALITY SCORE 116 93 107 COST (%) 100 137,14 140,57 characteristics Fig.6 – Material comparison table MATERIAL 17 The actual two materials that can go on are PVC and HDPE. The material chosen is PVC. 0 20 40 60 80 100 120 140 PVC PP HDPE QUAKITY SCORE MATERIAL QUALITY vs MATERIAL 0 20 40 60 80 100 120 140 160 180 104 106 108 110 112 114 116 118 COST (%) QUALITY SCORE COST (%) VS QUALITY PVC HDPE Fig.7 – Quality vs material graphic Fig.8 – Cost vs quality graphic 18 7.Mould design The next section covers the design of the mould from the beginning. There is a great variety of type of moulds depending on the cast, the ejection system, the part geometry, etc. The mould has to be capable of producing the shape of the chosen part. The key factor is the shape of the part because it will determine the rest of the mould. On this particular case, a T-fitting will be produced. For doing that an injection mould has been chosen. Fig.7 – Mould overview 19 The first thing to notice is the cores incorporated that are needed for making the part hollow. The cores move horizontally when the mould opens, leaving the desired hollow shape to the part. 7.1.- Part ubication The first layout had a problem and was that the 20 mm space between the cavities and the end of the mould was not enough for the cores to slide without falling down, so a much bigger mould had been chosen. The mould is designed to fabricate 4 parts on a single injection cycle. The part dimensions make this possible. Square dimensions have been chosen for keeping it as symmetric as possible, making it easier to mechanize. Fig.8 – Part distribution 20 On fig 8 the 4 cavities for the part can be observed. The reason the cavity has different color is because the mould has been designed to not only be able to produce one type of T-fitting, but a range of different values of them. So, it will be able to make more profit than if it only produced one specific type. Just by changing the cavity it’s possible to make another part (always keeping in mind the geometrical restrictions. The part is ubicated on the cavity, and then this cavity is brought to the mould as seen on fig 9. Fig.9 – Part cavity 21 7.2.- Mould cycle On the next lines the cycle which the mould goes through will be described. 7.2.1.- Initial position First the mould remains closed, as observed on fig. 7 and ready to inject the PVC. 7.2.2.- Injection The flow, temperature, pressure, velocity… is controlled from the injection machine. The PVC coming from the injection machine flows through the sprue (red color), Fig.10 – Molten PVC flow through sprue 22 from it to the runners, the gates and finally to the cavities as seen on fig. 10, 11 and 12. Fig.11 – Molten PVC flow through runners Fig.12 – Molten PVC flow filling cavity 23 When the molten PVC starts to flow so does the cooling system, pumping water to control the temperature on the mould. 7.2.3.- Mould opening After injecting the material into the cavity and waiting enough for it to cool down the mould opens from the middle plates, at the same time the cores start also moving, leaving behind the part shape, until its full opening (fig 13). The cores slide through a positioning channel (red circles) which ties them to the bottom plate. Fig.13 – Mould cores opened 24 Also, for every core there are 2 spring plungers (fig.14) that delimitate how far the cores can go, the cores have holes mechanized with the form of the spring plunger as well, so when they make contact the dock of the spring plunger goes up and nail the part. The bottom plate also has drills to allocate the spring plungers (fig. 15). Fig.14 – Spring plungers Fig.15 – Spring plungers housing 25 7.2.4.- Part ejection When the mould opens completely and the cores are out of the cavities the ejector pins come up and separate the part from the mould. There is a total of 3 ejector pins for each cavity. The middle ejector pin has triple function, first one is to eject the sprue, the second one is to prevent the sprue and runners from falling. The mould will be horizontally positioned, so if no action was taken, once the ejector pins come out the 4 connected parts by the sprue would fell into the ground, by notching the middle ejector we can make sure it will remain there. And last, it breaks the gates leaving only the desired part shape. This is thanks to the design of the gate, the gate is pitched and thinner on the end, which helps break it. Fig.15 – Spring plungers housing 32 9.- Bibliography Catalogs • The Hasco catalog. For mould components price. • Borealis catalog. For polypropylene properties. • PolyOne catalog. For PVC properties. • Eni Versalis catalog. For polyethylene properties. Websites • https://www.youtube.com/watch?v=dWZumei9-zQ : o [Consulted on the 22/04/18] Videotutorial for splitting parts on Solidworks • https://www.hasco.com/hasco/es/formAssistant o [Consulted on the 21/03/18] For downloading the mould CAD mould • https://www.creativemechanisms.com/blog/everything-you-need-to- know-about-pvc-plastic o [Consulted on the 10/05/18] PVC information. • https://www.pitfallsinmolding.com/cycletime.html o [Consulted on the 18/05/18] Information about cycle time and cooling. 33 o • https://todopolimeros.wordpress.com/2017/03/15/colada-fria- colada-caliente/ o [Consulted on the 25/05/18] Information about types of casting systems. • http://www.matweb.com/ o [Consulted on the 12/05/18] Information about materials. • http://tecnologiadelosplasticos.blogspot.com/2012/10/reciclado-de- pvc.html o [Consulted on the 28/05/18] Information about PVC recycling. Books • Menges, Georg, (2001), ‘’How to make Injection molds’’,Munich: Hanser, Gardner Publications References [1]-Properties from Borealis catalog. [2]-Properties from PolyOne catalog. [3]-Properties from Eni Versalis catalog. [4] Prices from plasticker, t.h.o.p., monatspreisubersitchten.2017 34 [5] Image courtesy of the user Blue tooth7, published on the 14 October 2011 under the Creative Commons Attribution-Share Alike 3.0 Unported license on https://commons.wikimedia.org/wiki/File:Mold_cavity.jpg . Bachelor’s Degree in Mechanical Engineering Final Degree Project DESIGN OF AN INJECTION MOULD BUDGET AUTOR: DANIEL PÉREZ GARCIA DIRECTOR: MIGUEL SÁNCHEZ-SOTO Index 1.- Introduction ......................................................................................................................... 3 2.- Mould components ............................................................................................................ 4 3.- Machining ............................................................................................................................ 5 4.- Assembly and adjustment ................................................................................................ 8 5.- Thermal treatments ........................................................................................................... 8 6.- Designing costs ................................................................................................................ 10 7.- Budget resume ................................................................................................................. 10 8.- Assessment ...................................................................................................................... 11 9.- Unitary cost and amortization ........................................................................................ 12 9.1- Material cost ............................................................................................................... 12 9.2.- Injection machine costs ........................................................................................... 12 9.3- Total cost .................................................................................................................... 13 9.4- Amortization................................................................................................................ 13 10.- Working time .................................................................................................................. 14 11.- References ..................................................................................................................... 15 1.- Introduction The budget for creating the injection mould designed on the technical report will be realized. The budget will include materials, machining, assembling and designing. An assessment of the costs will be done and the cost for fabricating the 10000 will be calculated. DISCLAIMER: Without working on a company dedicated to the sector there is no way to give exact prices, so the ones showed may be not the final ones. They normally include some sort of discount reached after both interested parts meeting. The budget will be break down into subsections for facilitate its understanding. First the cost of the normalized mould components, then the costs of machining the components, creating the new ones and applying thermal treatments, after that, the assembly of all components and finally the design costs. 2.- Mould components There are a lot of mould components providers on the market. On this case Hasco has been chosen among all of them for its assistant, which is very intuitive and easy to use. They also provide CAD data for all its components without the need of registration. Code Price/u (€) * Quantity Material Z31_12x85 1,12 4 DIN 912 Z31_8x30 0,26 4 DIN 912 Z31_12x30 0,57 4 DIN 912 Z31_2x16 0,22 24 DIN 912 Z33_4x8 0,28 4 DIN 7991 Z691_12x2,5 0,09 8 - Z55_18x3 1,76 4 DIN 1.0711 Z00_46x22x65 21,53 4 DIN 690 Z10_46x24 17,54 4 DIN 690 Z20_30x60 8,48 4 DIN 690 Z40_2x100 2,98 12 DIN 1530 Z40_10x100 6,24 1 DIN 1530 Z87_13x12x1.5 0,98 16 DIN 2.0401 Z511_12x56x3,5x15,5 46,77 1 DIN 16752 Z37_10x19 0,75 16 DIN 1.0718 K10_346x346x27 366,67 2 DIN 1.2379 K20_246x246x46 518,21 2 DIN 1.2379 K40_346x346x56 117,29 1 DIN 1.2379 K60_346x346x17 180,80 1 DIN 1.2379 K70_346x346x22 216,74 1 DIN 1.2379 TOTAL 2606,43 € 2606,43 € is the cost of the components directly bought to Hasco. The plates have been ordered on quality 2379 because is a high hardness steel and can be applicated the quenching and tempering heat treatment. There are components not appearing on the table and it’s because those can’t be bought, they must be mechanized, thus will be included on machining costs. 3.- Machining Once the parts are acquired they are sent to machining for obtaining the desired dimensions on the components. Nowadays almost every mould is built by EDM (Electrical Discharge Machining) and CNC (Computer Numerical Control) machining. Those two methods allow to give the most complex shapes to moulds with a lot of precision and efficiency, since they are driven by computers. The prices given below will be for CNC machining. The price is 54 €/h [1]. The table below shows the number of minutes needed to give shape to the components brought directly from the supplier and the cost of machining. *t:top plate, b:bottom plate The operations needed are detailed on the planes. For the non-standard components buying the raw material will be needed. The material chosen is steel 2379 because is a high hardness steel and can be applicated the quenching and tempering heat treatment. The price is 3,5 €/kg. [1] The amount of material each component has is: • Frontal ejector- 1,26 kg, 2 u • Side ejector- 0,94 kg, 2 u • Sliding guide- 0,13 kg, 4 u • Shingle- 0,17 kg, 4 u • Top part housing- 0,90 kg, 4 u • Bottom part housing- 0,45 kg, 4 u Total: 11 kg The amount of material needed is calculated by the designing 3D software SolidWorks by grabbing the volume and then multiplying by the density of steel 2379. [2] Code Quantity Minutes Cost (€) K10_346x346x27 1 50 45 K20_246x246x46-t* 1 4200 3780 K20_246x246x46-b* 1 4800 4320 K60_346x346x17 1 70 63 K70_346x346x22 1 70 63 TOTAL 8271 € The amount of steel needed is really low and it will be included into the budget given by the workshop where the components will be brought. Also, it won’t have much impact on the final price by the reason given above. It will be omitted from the final price. The table below shows the number of minutes needed to give shape to the components that can’t be brought directly from the supplier and the cost of machining. The total cost from machining is 10323 €. Code Quantity Minutes Cost (€) Frontal ejector 2 200 360 Side ejector 2 200 360 Sliding guide 4 40 144 Shingle 4 30 108 Top part housing 4 150 540 Bottom part housing 4 150 540 TOTAL 2052 € 10.- Working time The following section will try to calculate the time dedicated to produce the part goal that is 10000 parts/year. For doing that few data id needed to know: • Cycle time: Approximately 30 secs • Parts/cycle: 4 parts • Working hours: Theoretically the working day has 8 hours. Operating we have that we can produce up to 3840 parts each day. For producing the 100000 parts we will need at least 27 days, which is more or less a month (of working, not including weekends or festivities). As said on the technical project, if the cavities change it can produce other parts, so it can work 27 days for having the 100000 parts ready and then work for other projects, making it easier to amortize. 11.- References [1] The prices and the number of minutes needed for machining and thermal treatments with the price of raw material are given by the workshop workers of ThyssenKrupp Materials Iberica. Thus, they are an approximation since the components have not being produced. [2] Density from BLOCK Y CIA S.A.C.I. catalogue. Steel F2379 [3] Density and price from technical memory, chapter 6, pages 11 to 14. Bachelor’s Degree in Mechanical Engineering Final Degree Project DESIGN OF AN INJECTION MOULD PLANES AUTOR: DANIEL PÉREZ GARCIA DIRECTOR: MIGUEL SÁNCHEZ-SOTO 6 8 26 37 V V Y Y 16 15 4 10 9 5 14 23 17 24 28 27 2120 22 7 18 19 43 1 3 2 11 12 13 25 Mark Name Code Quantity Material 1 Z31_12x85 4 DIN 912 2 Z691_12x2,5 8 - 3 Z20_30x60 4 DIN 690 4 Plate 1 K10_346x346x27 1 DIN 1.2085 5 Plate 4 K60_346x346x17 1 DIN 1.2085 6 Z33_4x8 4 DIN 7991 7 Z55_18x3 4 DIN 1.0711 8 Z31_8x30 4 DIN 912 9 Plate 5 K70_346x346x22_1.2085 1 DIN 1.2085 10 K40_346x346x56_1.2085 1 DIN 1.2085 11 Z10_46x24 4 DIN 690 12 Z31_12x30 4 DIN 912 13 Z00_46x24x65 4 DIN 690 14 K10_346x346x27_1.2085_2 1 DIN 1.2085 15 Z511_12x56x3,5x15,5 1 DIN 16752 16 Z87_13x12x1,5 16 DIN 2.0401 17 Z31_2x16 24 DIN 912 18 Plate 3 K20_246x246x46_1.2085 1 DIN 1.2085 19 Plate 2 K20_246x246x46_1.2085_2 1 DIN 1.2085 20 Z40_2x100 12 DIN 1530 21 Z40_10x100 1 DIN 1530 22 Sliding guide 4 DIN 1.1730 23 Shingle 4 DIN 1.1730 24 Side Ejector 2 DIN 1.1730 25 Frontal Ejector 2 DIN 1.1730 26 Z37_10x19 8 DIN 1.0718 27 Top part housing 4 DIN 1.1730 28 Bottom part housing 4 DIN 1.1730 Est.sup.UNE 1037/Tol.gral.ISO 2778-K/Tol.geom.ISO 2778-m Date Layover Name, surname: A3 Plane abbreviation Plane denomination Project denomination: Escola d'Enginyeria de Terrassa - E E T Sliding Injection Mould design P0 1 : 2,5 20/05/1 8 Mould Assembly Pérez García, Daniel Producto SOLIDWORKS Educational. Solo para uso en la enseñanza. 396 346 294 224 294 51 61 26 A A 30 20 90 28 12 14 27 15,50 4 13 7 SECTION A-A R3 1. Mechanization: Hole for the nozzle • N8 Est.sup.UNE 1037/Tol.gral.ISO 2778-K/Tol.geom.ISO 2778-m Date Layover Name, surname: A3 Plane abbreviation Plane denomination Project denomination: Escola d'Enginyeria de Terrassa - E E T Sliding Injection Mould design P1 1 : 2,5 20/05/1 8 Plate 1 Pérez García, Daniel Producto SOLIDWORKS Educational. Solo para uso en la enseñanza. 346 346 74 136 94 126 48,50 48,50 100 120 54,30 62 98,70 91 9,50 25 7,70 4 4 102 122 B B N6 78 12 42 12 Symmetric Mechanization Hole for the nozzle • Top part housing mechanization • Frontal and side ejector housing • Sliding guide housing mechanization • Injection channel mechanization • Drills for refrigeration • M2 48,50 20 68 M2 10 12,50 15 12 46 20 22 SECTION B-B Symmetric Refrigeration View Symmetric 2. ( ) N8 N6 Est.sup.UNE 1037/Tol.gral.ISO 2778-K/Tol.geom.ISO 2778-m Date Layover Name, surname: A3 Plane abbreviation Plane denomination Project denomination: Escola d'Enginyeria de Terrassa - E E T Sliding Injection Mould design P2 1 : 2,5 20/05/1 8 Plate 2 Pérez García, Daniel Producto SOLIDWORKS Educational. Solo para uso en la enseñanza. 40 10,92 25 54,30 62 346 346 6 57,50 26 26 100 120 4 4 102 40 C C D D N6 78 42 Symmetric 35° 10 12 10 40,87 SECTION D-D 46 2 9,93 7,91 30 M36 M10 61 22 R3 20 15 4 45° SECTION C-C 1x45º Symmetric Refrigeration view Symmetric Symmetric 3. ( ) Mechanization Hole for the ejector pins • Hole for the runner ejector pin • Bottom part housing mechanization • Hole for the sliding guide • Frontal and side ejector housing • Hole for the ejector blocking system • Injection channel mechanization • Guide for the frontal and side ejectors • Drills for refrigeration • N8 N6 Est.sup.UNE 1037/Tol.gral.ISO 2778-K/Tol.geom.ISO 2778-m Date Layover Name, surname: A3 Plane abbreviation Plane denomination Project denomination: Escola d'Enginyeria de Terrassa - E E T Sliding Injection Mould design P3 1 : 2,5 20/05/1 8 Plate 3 Pérez García, Daniel Producto SOLIDWORKS Educational. Solo para uso en la enseñanza. 258 346 25 58 20 20 11 30 62,30 E E Plate 4 N8 20 20 258 346 30 11 25 37,30 F F Plate 5 N8 17 6,80 2 10 SECTION E-E 15 9 11 22 4 15,36 M3 11 11 SECTION F-F 4. 5. Mechanization: Holes for ejector pins • Hole for runner ejector pin • Mechanization: Holes for ejector pins • Hole for runner ejector pin • Est.sup.UNE 1037/Tol.gral.ISO 2778-K/Tol.geom.ISO 2778-m Date Layover Name, surname: A3 Plane abbreviation Plane denomination Project denomination: Escola d'Enginyeria de Terrassa - E E T Sliding Injection Mould design P4 1 : 2,5 20/05/1 8 Plates 4 & 5 Pérez García, Daniel Producto SOLIDWORKS Educational. Solo para uso en la enseñanza. 48,70 120 11 G GHH N6 35° R6 15 34,60 10 SECTION G-G 30 4 45° R3 SECTION H-H 12 41 100 II J J N6 30 45° 15 4 R3 SECTION I-I 35° 62 10 SECTION J-J 24 7,50 13 K K 9 15 24 2,40 4,40 1,40 7,50 SECCIÓN K-K 6. ( ) Frontal Ejector 7. ( ) 8. Side Ejector Shingle N8 N6 N8 N6 N8 Est.sup.UNE 1037/Tol.gral.ISO 2778-K/Tol.geom.ISO 2778-m Date Layover Name, surname: A3 Plane abbreviation Plane denomination Project denomination: Escola d'Enginyeria de Terrassa - E E T Sliding Injection Mould design P5 1 : 1 20/05/1 8 Frontal and Side Ejectors and shingle Pérez García, Daniel Producto SOLIDWORKS Educational. Solo para uso en la enseñanza. 12,50 110 10 35° N6 26 25 3 3 L L 2,40 4,40 11,10 SECTION L-L 54,30 62 12 19 13,20 R0,46 1,80 1,47 15,35 0,29 7,30 6,89 27,50 M M 20 20,68° SECTION M-M 25 17,30 19,85 N N 2 8,83° SECTION N-N 9. ( ) 10. Top part housing 10. Bottom part housing (it shares dimensions with top part housing but the bottom part has 3 holes for ejector pins and a hole for injecting the plastic on it) N8 N6 N6 N6 Est.sup.UNE 1037/Tol.gral.ISO 2778-K/Tol.geom.ISO 2778-m Date Layover Name, surname: A3 Plane abbreviation Plane denomination Project denomination: Escola d'Enginyeria de Terrassa - E E T Sliding Injection Mould design P6 1 : 1 20/05/1 8 Sliding guide and top and bottom part housing Pérez García, Daniel Producto SOLIDWORKS Educational. Solo para uso en la enseñanza.