Yearly Archive June 5, 2020

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Knowledge of machining

For processing of deformed and eccentric parts, the workpieces are generally fixed with a flower plate. Therefore, first of all, pay attention to the card. The claw and pressing plate shall not extend beyond the diameter of the disc, and it is better to install a shield. Secondly, pay attention to the counterweight of eccentric parts. It is important and appropriate. The clearance between the inner hole diameter of the counterweight and the screw diameter should be small. The rotating speed of the machine tool shall not be too high, so as to prevent the counterweight from moving outward under the centrifugal force during the rotation, colliding with the guide rail of the machine tool, breaking the screw and damaging the operator.

What safety requirements should the control system of machine tool equipment meet?

1. Easy to operate, reduce walking back and forth, avoid unnecessary bending and tiptoe.

2. The positioning is accurate and reliable to prevent misoperation due to slight vibration.

3. The movement direction of the operating parts and the movement direction of the operated parts of the machine tools shall meet the requirements, and shall be marked with simple symbols.

4. The necessary interlock mechanism shall be installed to prevent the uncoordinated action of the operating parts and the accidents caused by the uncoordinated operation of multiple persons.

5. The structure and arrangement position of handle, hand wheel and button shall meet the requirements. The start button shall be installed in the casing or equipped with a guard ring to prevent accidental touch. The handwheel and handle installed on the shaft rod will hurt people when rotating with the shaft during automatic feed, so the automatic release device shall be installed.

Basic knowledge of machining process

Basic knowledge of machining technology i. production process and production process of products refer to the whole process of transforming raw materials into finished products. The production process of mechanical products generally includes:

1. Preparation of production and technology, such as process design and design and manufacturing of special process equipment, preparation of production plan, preparation of production data, etc;

2. Manufacturing of blanks, such as casting, forging, stamping, etc;

3. Machining, cutting, heat treatment and surface treatment of parts;

4. Product assembly, such as general assembly, component assembly, commissioning inspection and paint, etc;

5. Production services such as the supply, transportation and storage of raw materials, purchased parts and tools;

The process of changing the shape, size, relative position and property of the production object in the production process to make it a finished product or semi-finished product is called process. For example, the manufacturing, machining, heat treatment and assembly of rough are all technological processes.

In the process of machining, if the shape, dimension and surface quality of the production object are directly changed by the method of machining, it is called machining process. Similarly, the process of assembling the processed parts into a machine to achieve the required assembly accuracy and obtain the predetermined technical performance is called the assembly process.

Machining process and assembly process are two main contents in the research of mechanical manufacturing technology.

2、 Composition of machining process

The machining process is composed of one or several sequential processes, which can be divided into several installation, working position, working step and cutting.

Several important steps in sheet metal processing

Sheet metal is sometimes used as trigger gold, which comes from the English word plate metal. Generally, some metal sheets are pressed by hand or die to produce plastic deformation, forming the desired shape and size, and further forming more complex parts through welding or a small amount of machining, such as the chimney commonly used in the family, tin furnace, and automobile shell are sheet metal parts.

Sheet metal processing is called sheet metal processing. For example, using plates to make chimneys, iron buckets, oil tanks, ventilation pipes, elbows, Tianyuan places, funnel-shaped and so on. The main processes are cutting, bending and buckling, bending and forming, welding, riveting and so on, which requires certain geometric knowledge.

Sheet metal parts are sheet metal parts, which can be processed by stamping, bending, stretching and other means. A general definition is the parts with constant thickness in the process of processing. The corresponding parts are casting parts, forging parts, machining parts, etc. for example, the iron shell outside the car is sheet metal parts, and some cabinets made of stainless steel are sheet metal parts.

Modern sheet metal technology includes: filament power winding, laser cutting, heavy processing, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, metal plate bending forming, die forging, water jet cutting, precision welding, etc.

The surface treatment of sheet metal parts is also a very important part of the sheet metal processing process, because it can prevent parts from rusting and beautify the appearance of products. The function of surface pretreatment of sheet metal parts is mainly to remove oil, oxide skin, rust, etc. it is to prepare for surface post-treatment, and the latter treatment is mainly to spray (bake) paint, spray plastic and plating antirust layer, etc

General principles of the proposed process route for machining

1. Machining datum first

In the process of machining, the surface used as the positioning reference should be machined first, so as to provide the precision reference for the subsequent processing as soon as possible. It is called “benchmark first”.

2. Division of processing stages

Surfaces with high machining quality requirements are divided into three stages: rough machining, semi finishing and finishing. It is mainly to ensure the processing quality, to facilitate the rational use of equipment, to facilitate the arrangement of heat treatment process, and to facilitate the detection of blank defects.

3. Face before hole

For the box, bracket, connecting rod and other parts, the plane shall be machined before the hole is machined. In this way, the hole can be machined by plane positioning, ensuring the position accuracy of plane and hole, and bringing convenience to the machining of hole on plane.

4. Finishing

The finishing of the main surface of the workpiece after finishing (such as grinding, honing, fine grinding / rolling, etc.) shall be carried out at the last stage of the process route. The surface finish after finishing shall be over ra0.8um, and slight collision will damage the surface. In China, Japan, Germany and other countries, after finishing, flannelette shall be used for protection, no hands or other things are allowed Parts directly contact the workpiece, so as to avoid damage to the polished surface due to the transfer and installation between processes.

Production process of stamping die

The production process of stamping die is the whole process that the raw materials are cast, forged, cut and processed into the stamping die parts required by the design drawing, and then the stamping die parts are assembled into the die according to the technical requirements of the design and process specification.

A set of qualified mould shall meet the following basic requirements:

1. The die parts can meet the requirements of drawing design in terms of material performance, forming die processing and heat treatment quality;

2. Assembly quality and service performance that can meet the design requirements after mold assembly;

3. The quality of the test punching parts is qualified and meets the requirements;

4. Die has high service life and durability;

5. The production cycle of die manufacturing is short, the cost is low, the quality is stable, and the economic and technical benefits are good.

Function characteristics of LED solid crystal machine

1. One machine is applicable to all kinds of LED solid crystal operation

2. Quick change products

3. Double vision positioning system, high crystallizing accuracy

4. Super large material carrier 4 “X8” double slot

5. Standard humanized windows interface design

6. Chinese operation interface, high affinity for operation setting

7. Modular automatic teaching, simple and fast setting

8. Point by point or two-point production diversification

9. The whole plate of support is loaded and unloaded, and the fixture only needs to be replaced for different products

Those materials are generally used in block rules

The manufacturing of each piece of block gauge will directly affect the stability of size. Therefore, the material should be carefully considered when manufacturing or purchasing the block gauge. Here are some important characteristics for reference:

(1) The accuracy requirements of its standard size and surface accuracy shall be above the specification standard.

(2) Do not affect the standard size due to environmental changes.

(3) It shall be wear-resistant and corrosion-resistant.

(4) It needs to be practical, such as shape, size, size, thickness, etc.

There are several kinds of materials for manufacturing block gauge: chromium carbide, tungsten carbide, alloy steel, stainless steel, quartzite, etc. However, most of the manufacturers of block gauge are mainly made of alloy steel and tool steel, and their advantages are summarized as follows:

(1) After hardening, the deformation has wear resistance and stability.

(2) Low price and easy machining.

Precautions for wire cutting

1. Before starting the machine, check whether the electrical parts are loose. If there are broken wires and parts falling off, inform the professional personnel in time for maintenance.

2. Check the tension of molybdenum wire.

3. Check whether the guide wheel is damaged and change the position of the working face in time to prevent the molybdenum wire from being broken.

4. Check if there is a communication slot in the wire stopper, adjust the position of the working face in time to prevent the molybdenum wire from being broken.

5. Check that the lubricating part of the machine tool has enough lubricating oil.

6. Daily maintenance:

6.1. Add No.30 engine oil once per shift for transverse feed gearbox and longitudinal feed gearbox.

6.2. Each drive shaft, screw rod nut and guide plate of the screw storage barrel shall be added with 30 engine oil once for each plate.

Maintenance of CNC lathe

1. Clean and lubricate each guide rail surface every day. For machine tools with automatic lubrication system, regularly check and clean the automatic lubrication system, check the oil volume, add lubricating oil in time, and check whether the oil pump starts and stops regularly.

2. Check whether the automatic lubrication system of the spindle box works normally every day, and change the lubricating oil of the spindle box regularly.

3. Check whether the cooling fan in the electrical cabinet works normally, whether the air duct filter screen is blocked, and clean the dust.

4. Pay attention to check the cooling system, check the liquid level, add oil or water in time, and replace and clean the dirty oil or water.

5. Pay attention to check the main shaft drive belt and adjust the tightness.

6. Pay attention to check the tightness of guide rail insert strip and adjust the clearance.

7. Pay attention to check whether the oil pump in the oil tank of the hydraulic system of the machine tool has abnormal noise, whether the height of the working oil level is appropriate, whether the indication of the pressure gauge is normal, and whether the pipeline and all joints have > leakage.

8. Pay attention to check whether the guide rail and machine tool protective cover are complete and effective.

9. Pay attention to check the mechanical accuracy of all moving parts to reduce the deviation of shape and position.

10. Clean the machine tool, clean the scrap iron and wipe the cooling liquid at the guide rail to prevent the guide rail from rusting

The planning of the processing route of precision parts is to make the overall layout of the process

General principles for drawing up process routes of precision parts

The process planning of precision parts can be divided into two steps. First of all, it is to draw up the process route of parts processing, and then determine the process size of each process, used equipment and process equipment, cutting specifications, working hours quota, etc. These two steps are interrelated and should be analyzed comprehensively.

The main task is to select the processing methods of each surface, determine the machining sequence of each surface, and determine the number of processes in the whole process.

General principles of the proposed process route

1. Machining datum first

In the machining process of parts, the surface used as the positioning reference should be machined first, so as to provide the precision reference for the subsequent processing as soon as possible. It is called “benchmark first”.

2. Division of processing stages

Surfaces with high machining quality requirements are divided into three stages: rough machining, semi finish machining and finish machining. It is mainly to ensure the processing quality, to facilitate the rational use of equipment, to facilitate the arrangement of heat treatment process, and to facilitate the detection of blank defects.

3. Face before hole

For the box, bracket, connecting rod and other parts, the plane shall be machined before the hole is machined. In this way, the hole can be machined by plane positioning, ensuring the position accuracy of plane and hole, and bringing convenience to the machining of hole on plane.

4. Finishing

The finishing of main surfaces (such as grinding, honing, finishing rolling, etc.) shall be placed at the last stage of the process route.

CNC Machining parts

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