《塑料成型工藝及模具設(shè)計(jì)》試卷二)（Plastic molding process and mold design test paper )）

1、塑料成型工藝及模具設(shè)計(jì)試卷二)（Plastic molding process and mold design test paper 2)）Plastic molding process and mould design test paper 2The test time is 150 minutes1. Fill in the blanks (1 point each time, 30 points)1. There are two methods for preparing synthetic resin.2. There are three kinds of plastics in th

2、e process of change, but different physical states:,.3. In order to facilitate the mold removal, the lateral structure of the plastic parts should be avoided as far as possible.4. In order to simplify the mould structure, generally, the plastic parts should be kept on or above the open mold.5. The p

3、urpose of setting up the precision positioning device is to play a role in the cavity of the mold when the cone on one side of the mold holds the shape of the other side of the mold.The temperature, temperature and temperature are the temperature, temperature and temperature in the injection molding

4、.7. The feeding cavity of the semi-spill compression mould is located in the place. Excess raw materials can be passedStore it and then get rid of it.8. Considering the heat transfer area, the section of the thermosetting plastic injection mold shunt is suitable for the section; Thermoplastic plasti

5、c injection moldingThe section of die shunt channel should be in shape. From easy processing, thermoplastic plastic injection mold is commonly used form and shape.9. If you want to know whether the mold will be clamped when a molding machine is closed, you will need to use the mold size comparison e

6、quipment (technical parameters) and (technical parameters).The axis of the main channel is generally located in the mould, which is heavy with the axis of the injection machineClose.It has a pit in the core of the large end of the gate, which is called the main channel gate.The action is to make the

7、 melt.12, in order to suppress and prevent plastic during molding process or the use, due to the effect such as heat, light, oxygen degradation and oxidation phenomenon such as broken chain, alternating chain and cause damage, add the appropriate.(1 point, 10 points for each question)1. The followin

8、g plastics belong to thermoset plastic ().A, polyethylene B, ABS C, nylon D, phenolic2. The viscosity of the plastic melt is independent of the shear rate, which is called a () fluid.A, binha B, swelling C, Newtonian D, pseudoplastic3. Shortage of mold cavity is likely to cause mold opening difficul

9、ty.A, stiffness B, strength C, wear resistance D, corrosion resistance4. The method to effectively reduce molecular orientation in injection molding products is ().A, reduce the material temperature B, reduce the charging speed C, reduce mold temperature D, and reduce the pressure of injection moldi

10、ng5. For small plastic parts, the most important factor affecting dimensional accuracy is ().A. The influence of the manufacturing tolerance B and the molding shrinkage rate of the forming parts C, the wear volume of the molding parts D, the error of die assembly6. The supporting rod for injection m

11、olding and push-rod is ().A, Z type B, ball head C, fungus D, cone7. The defect of plastic parts which may result from defective exhaust is ().A, warp B, burr C, joint D, burn mark8. The correct relationship between the oblique Angle of the locking block and the inclination of the oblique guide colu

12、mn is () in the lateral parting mechanism of the oblique guide column.A, alpha = alpha + 2 3 , alpha B = alpha - 2 3 C, alpha alpha 25 D, alpha alpha 25 or less9. The factor of determining the number of cavity number when designing the mold is ().A, the current equipment situation B, the size C of t

13、he plastic parts, the precision D of the plastic parts, the raw materials of the plastic parts10. Relatively speaking, the most difficult gate to remove is ().A, ring gate B, spokes gate C, point gate D, claw gate3. Multiple choice questions (a total of 10 questions, 2 points for each question, 20 p

14、oints in total, and at least two correct answers to each question, multiple choice, omission and wrong choice)1. The main effects of fillers include ().A. reduce product costsB. New properties of materialsC. Improve certain performance of productsD, inhibit and prevent plastic degradationE. prevent

15、the burning of plastic productsThe advantages of plastic products include ().A, the quality light B, the chemical stability excellent C, the electrical insulation performance good D, the absolute strength high E, the forming processing is convenient3. The solution cavity cannot be filled with the fo

16、llowing measures to find a solution ().A, increase the shear rate of the meltB, reduce the shear rate of the meltC. Increase the temperature of the meltD. Replace the plastic with lower apparent viscosityE. improve mold temperature4. Main technological parameters controlled by injection molding incl

17、ude ().A, temperature B, humidity C, pressure D, time E, stiffness5. Design of molded thread ().A, the screw tooth should be designed as the coarse threadB. The screw teeth should be designed as sharp threadC, design is high-precision threadD, multi-design for low precision threadsE, the number of t

18、hreads should not be too muchThe shape of the parting surface can be ().A, plane B, slope C, stair surface D, surface E, noncontinuous surfaceFrom the Angle of easy repair mode, the integral type cavity is easy ().A, repairing B, repairing small C, repairing deep D, repairing shallow E, repairing he

19、ight8. In the mould, the assembly relation of the push tube is ().A. There is A gap between the inner wall of the thrust tube and the coreB. There is a transition between the inner wall and the coreC. Clearance between the outer wall and the templateD, the outer wall of the thrust tube and the templ

20、ate are in transitionE, the outer wall of the push pipe and the template have been in cooperationAccording to the mould installation mode, the mould type has ().A, horizontal mold B, vertical mold C, mobile mold D, fixed mold E, corner mold 10, belong to the casting system structure ().A, main road

21、B, channel C, cold hole D, gate E, products(4 points for each question, 12 points total)1. Name the deficiencies of plastic products.2. Why is it that the wall thickness of the plastic parts cannot be too small or too large?3. Talk about the conditions under which the forming part adopts the parquet

22、 structure.5. Comprehensive questions1. Write the name of each part.2. What kind of pouring system is used in the mould?3, what cooling system does the mould use?What is the role of item 11 and 14?5. How many parting faces are there in the mould? Whats the spacing?6. Describe the working principle o

23、f the mould.Answers to the questions1. Fill in the blanksThe answer:(1 point, 10 points for each question)1. The following plastics belong to thermosetting plastic (D).A, polyethylene B, ABS C, nylon D, phenolic2. The viscosity of plastic melt is independent of the shear rate, which is called a (C)

24、fluid.A, hama B, swelling C, Newtonian D, pseudoplastic3. Shortage of mold cavity (A) is likely to lead to mold opening difficulty.A, stiffness B, strength C, wear resistance D, corrosion resistance4. The method to effectively reduce molecular orientation in injection molding products is (D).A, redu

25、ce the material temperature B, reduce the charging speed C, reduce mold temperature D, and reduce the pressure of injection molding5. For small plastic parts, the most important factor affecting dimensional accuracy is (A).A, the forming parts manufacturing tolerance B, the effect of the shrinkage r

26、ate of forming parts, the amount of wear of the forming parts, and the error of the mould assembly6. The supporting rod for injection molding and push-rod is (A).A, Z type B, ball head C, fungus D, cone7. The defect of plastic parts which may result from defective exhaust is (D).A, warp B, burr C, j

27、oint D, burn mark8. The correct relationship between the oblique Angle of the locking block and the inclination of the oblique guide column is (A) in the lateral parting mechanism of the oblique guide column.A, alpha = alpha + 2 3 , alpha B = alpha - 2 3 C, alpha alpha 25 D, alpha alpha 25 or less9.

28、 The factor that is independent of the number of cavity number when designing the mold is (D).A, the current equipment situation B, the size C of the plastic parts, the precision D of the plastic parts, the raw materials of the plastic partsIn relative terms, the most difficult gate to remove is (A)

29、.A, ring gate B, spokes gate C, point gate D, claw gate3. Multiple choice questions (a total of 10 questions, 2 points for each question, 20 points in total, and at least two correct answers to each question,Multiple choice, omission, wrong choice1. The main effects of fillers are (A, B, C).A. reduc

30、e product costsB. New properties of materialsC. Improve certain performance of productsD, inhibit and prevent plastic degradationE. prevent the burning of plastic productsThe advantages of plastic products include (A, B, C E).A, the quality light B, the chemical stability excellent C, the electrical

31、 insulation performance good D, the absolute strength high E, the forming processing is convenient3. The solution cavity cannot be filled with the following measures to seek solutions (A C D E).A, increase the shear rate of the meltB, reduce the shear rate of the meltC. Increase the temperature of t

32、he meltD. Replace the plastic with lower apparent viscosityE. improve mold temperature4. The main technological parameters controlled by injection molding include (A C D).A, temperature B, humidity C, pressure D, time E, stiffness5. Design of molded thread (A D E).A, the screw tooth should be design

33、ed as the coarse threadB. The screw teeth should be designed as sharp threadC, design is high-precision threadD, multi-design for low precision threadsE, the number of threads should not be too muchThe shape of the parting surface can be (A, B, C, D).A, plane B, slope C, stair surface D, surface E,

34、noncontinuous surface7. From the perspective of easy repair mode, the integral cavity is easy (A D).A, B, C, deep D, shallow E, high8. The assembly relation of the push tube is (A C) in the mould.A. There is A gap between the inner wall of the thrust tube and the coreB. There is a transition between

35、 the inner wall and the coreC. Clearance between the outer wall and the templateD, the outer wall of the thrust tube and the template are in transitionE, the outer wall of the push pipe and the template have been in cooperation9. According to mold installation mode, mold type has (C D).A, horizontal mold B, vertical mold C, mobile die D, fixed mold E, corner mold1