Manufacturing Department Design for Threaded Products

Contents

Contents

Introduction

1 Workability Analysis of Parts

1.1 Description and design and process analysis of parts

1.2 Serviceability analysis of shaft-gear part

1.3 Definition of production type

2 Development of routing process of parts processing

2.1 Selection of the type of workpiece and methods of its production

2.2 Development of the routing process of the shaft-gear part

2.3 Development of routing process of part "nut GOST 1860-85"

2.4 Process Dimension Analysis

2.5 Selection of process equipment

3 Calculation of process operations

3.1 Calculation of cutting modes

3.2 Calculation of time standards

3.3 Cutting modes and time standards for manufacturing of all articles

4 Selection of accessory

4.1 Justification for selection of adaptation

4.2 Operation principle of the accessory

5 Calculation of control measuring tool

5.1 Calculation of threaded ring for thread M20 × 1.5 - 8 g

6 Area determination of workshop area and equipment calculation

6.1 Calculation for parts of "shaft" group

6.2 Calculation for parts of "nut" group

6.3 Determination of the total area of the site

6.4 Development of the site layout

7 Calculation of techno-economic indicators

7.1 Calculation of cost price for the "shaft" group

7.2 Calculation of cost price for nut group

7.3 Calculation of process cost

8 Life safety and environmental friendliness of the project

Literature

Application

Application

Good afternoon, dear commission!

The theme of my dirl project is the design of the production department for the manufacture of threaded products. In my project, as a production unit, I chose to design a machining area for the production of threaded products.

The initial data of the project are the manufacture of two nuts: a hexagonal normal nut GOST 252470 with an exhaust program of 4000 pieces and a hexagonal cap nut GOST 1186085 with an exhaust program of 5000. Since these products are standard products, it was decided to strengthen the task with additional threaded products, a gear shaft with an output program 5000 and a shaft with an output program 4000 were selected.

The next step in the design was to define the project structure, analysis of the source data, and further calculation. The design was divided into such components as the analysis of the initial parts, design and technological development, the selection of the device, the determination of the area of ​ ​ the site and the economic part.

In the initial data analysis, a workability analysis was performed to select a four-part detail representative for which a typical process plan would be developed. For selection, it is necessary to determine which of the presented parts is very labour intensive, taking into account the number of machined surfaces, their roughness and degree of accuracy, as well as the release program.

During the analysis, it turned out that the products are two groups: the "shaft" group and the "nut" group. Accordingly, two representative products for each group will be selected. With the same average values ​ ​ of the quota and the value of the roughness parameter for the shaft group, the representative product is the shaft part, since it has a more complex geometric shape. According to the same principle for the "nut" group, the representative article is the part "nut GOST 1186085."

Ratio factors will be calculated for each group to calculate the labour intensity of other products by multiplying it by the labour intensity of the representative product.

Since the representative products are two, two typical processes will be developed, respectively, but the shaft part is much more complicated than the nut part, so a dimensional analysis will be carried out only on it.

Before you can develop those processes, you must select a procurement method. It was decided to take the billet from the rolled stock, the choice is due to the fact that the knowingly cost of producing the rolled stock is lower than the cost of the billet from the rolled stock. Plus, the 40X steel used after forging has internal stresses, and their removal requires heat treatment (annealing), therefore, the costs of forging increase.

The further course of the design was the development of a typical technological process for the manufacture of the shaft part and the nut part GOST 1186085. Those process on the shaft-gear are presented in sketches. (telling the route)

The next step is a dimensional analysis. The purpose of dimensional analysis is to ensure the accuracy of the dimension links of the part surfaces required by the drawing. The analysis identifies the most efficient process structure to achieve the objective. A dimensional scheme was built. This diagram shows the connection of all dimensions and intermediate allowances in the form of a closed system. The dimensional diagram records the change in dimensional parameters as the process progresses.

Next, you must construct a combined graph to identify dimensional chains. A combined graph is obtained by adding the original and derivative graphs. Initial graph includes initial (design dimensions) and closing (allowances) links of process dimension chains. The derivative graph includes the process dimensions of machining operations and the dimensions of the initial workpiece. Next, dimensional chains are identified and calculated, after which all process dimensions are depicted on operational sketches.

An important point is the choice of technological equipment. The main criterion of choice is universal equipment, on which all surfaces of four products can be processed. Machines for processing parts, with the main characteristics are presented in the explanatory note.

Calculation of time modes and normalization of operations by time were done by analytical (calculated) and tabular methods. Summary tables of modes and time standards for each representative part are made.

To accelerate and simplify the process of thread cutting on nuts, a universal tool was chosen for thread cutting on standard nuts of different sizes.

The principle of operation of the device.

The accessory is installed through the shank (position 1) in the pinol of the rear head of the turning and screw-cutting machine 16K20F3S32.

Nuts of required standard size for thread cutting are installed and spring-loaded in seat sockets of dividing disk (position 30). Dividing disk has 6 seat sockets.

This accessory is equipped with disks (item 30) made of 8 different versions for cutting nuts of thread sizes from M6 to M20. In the cartridge of the spindle of the machine, the necessary machine mark is attached to the cams. Thrower flight is adjusted for cutting of 6 nuts at once by stop.

The handle (position 17) moves the rack (position 4) progressively through the gear (position 10) until the thread is cut. In this position, the pinion shaft (position 8) disengages from the carrier (position 9) and stops rotating the dividing disc, which is free to move along the nut-cutter.

The rack is installed in the housing (position 2) of the accessory, at that the housing is rigidly fixed on the mandrel, and the rack moves inside the housing along the sliding fit. Support disk (position 5) is rigidly fixed to the rack through 4 screws, which in its turn is connected to the dividing disk through the shaft-gear. On the other side in holes of support and dividing discs there installed is shaft rod, which is fixed on dividing disc by means of swivel nut (position 14), and in hole of support disc rotates on ball bearings.

After threading by the thrower, when the pinion shaft is again engaged with the driver, the following occurs. When the rack moves in the reverse direction, the gear rotates together with the dividing disk along the threaded screw grooves, moving the dividing disk by a certain angle calculated so that the disk turns with the dividing slot for thread cutting on the next nut. Rotation of the gear shaft by a certain angle is fixed by a carrier, which is attached to the housing of the accessory through a clamp (position 3). The leash can turn in the clamp when ball bearings are washed. In turn, the carrier is attached to the clamp with a nut (position 11) and spring-loaded with a spring brace to the clamp so that the carrier tip, after thread cutting, returns to the initial position, in engagement with the slot of the shaft-gear.

To control the thread on the gear shaft, a set of threaded gauge rings was designed. They are represented in the drawing.

The culmination of the design was the determination of the area of ​ ​ the mechanical area for the manufacture of all products and the economic part.

The calculation of area and equipment was divided into groups. The labour intensity of the products was determined, and the labour intensity of the given parts was calculated through the drive factor. A calculation was made of the number of machines and the number of workers. At the end of the section, the total area of ​ ​ the site was calculated and amounted to 165 m2. As a result, a plot layout was drawn up and presented in the drawing.

In the economic part of the project, the calculation was reduced to the calculation of the technological cost of machining all products. The calculation for the quoted parts was performed through the drive factor. At the end of the calculations, the full cost was calculated in the amount of 21728 rubles. A cost summary table is shown on the poster.

At the end of the design, the issues of safety and environmental friendliness of the manufacture of parts were considered. It was concluded that the technology for manufacturing parts is safe and environmentally friendly for people.

I have everything on it. Thank you for your attention!!!

Introduction

When designing a mechanical subdivision (section), the following main issues are solved in a certain sequence:

1 Develop a Site Design Assignment based on Plant Production Plan, Drawings, Structural Descriptions and Product Specification.

2 Selection of procurement type; Determination of annual requirements for basic materials, procurement and semi-finished products.

3 Design of machining processes of machine parts, establishment of type (type) of production and development of organizational form of these processes execution.

4 Selection of equipment types, identification of capacity and determination of number of machines required for execution of specified production program, as well as determination of their loading.

5 Specification of equipment, accessories and tools with their characteristics.

6 Determination of the required working composition and its number.

7 Development of equipment location plan in the workshop and determination of production area.

8 Determination of the quantity of equipment and areas of auxiliary departments, as well as areas of office and household premises.

9 Layout of the entire workshop, determination of the main dimensions of the building for the workshop, selection of the type of building, linking the layout of the workshop with the master plan.

10 Development of the economic part of the project.

Selection of fixture

Justification of accessory selection

When manufacturing a large number of different types of nuts, it is necessary to accelerate and simplify the process of cutting the internal thread. To do this, it is necessary to select a device that must be universal in nature in order to cut threads on different sizes without difficulty. A versatile tool for threading standard nuts was chosen.

Operating principle of the accessory

The accessory is installed through the shank (position 1) in the pinol of the rear head of the turning and screw-cutting machine 16K20F3S32.

Nuts of required standard size for thread cutting are installed and spring-loaded in seat sockets of dividing disk (position 30). Dividing disk has 6 seat sockets.

This accessory is equipped with disks (item 30) made of 8 different versions for cutting nuts of thread sizes from M6 to M20. In the cartridge of the spindle of the machine, the necessary machine mark is attached to the cams. Thrower flight is adjusted for cutting of 6 nuts at once by stop.

The handle (position 17) moves the rack (position 4) progressively through the gear (position 10) until the thread is cut. In this position, the pinion shaft (position 8) disengages from the carrier (position 9) and stops rotating the dividing disc, which is free to move along the nut-cutter.

The rack is installed in the housing (position 2) of the accessory, at that the housing is rigidly fixed on the mandrel, and the rack moves inside the housing along the sliding fit. Support disk (position 5) is rigidly fixed to the rack through 4 screws, which in its turn is connected to the dividing disk through the shaft-gear. On the other side in holes of support and dividing discs there installed is shaft rod, which is fixed on dividing disc by means of swivel nut (position 14), and in hole of support disc rotates on ball bearings.

After threading by the thrower, when the pinion shaft is again engaged with the driver, the following occurs. When the rack moves in the reverse direction, the gear rotates together with the dividing disk along the threaded screw grooves, moving the dividing disk by a certain angle calculated so that the disk turns with the dividing slot for thread cutting on the next nut. Rotation of the gear shaft by a certain angle is fixed by a carrier, which is attached to the housing of the accessory through a clamp (position 3). The leash can turn in the clamp when ball bearings are washed. In turn, the carrier is attached to the clamp with a nut (position 11) and spring-loaded with a spring brace to the clamp so that the carrier tip, after thread cutting, returns to the initial position, in engagement with the slot of the shaft-gear.