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What is the standardization of fixture design?

KYLT Precision CNC Machining — Thu, 31 Oct 2019 11:30:09 +0000

In manufacturing process, fixture is widely used. In order to save cost and use min. quantity fixtures to meet more production demand or suit for more manufacturing line use. That require fixture design to met some standard.

CNC machined jig part

“What is the standardization of fixture design?”

1.Basic methods and steps of fixture design

Preparation before design of fixture:

A) design notice, finished part drawing, blank drawing, process route and other technical data, understand the processing technical requirements of each process, positioning and clamping scheme, processing content of previous process, blank situation, machine tool, cutter, Inspection measuring tool used in processing, machining allowance and cutting amount, etc.

B) understand the production batch and the need for clamps;

C) understand the main technical parameters, performance, specification, accuracy of the machine tool used and the connection dimension of the structure of the part connected with the fixture;

D) standard stock of fixture.

CNC MACHINED FIXTURE PART

2.Problems to be considered in fixture design

Generally, the structure of fixture design is single, which gives people a feeling that the structure is not very complex. Especially now, the popularity of hydraulic fixture greatly simplifies the original mechanical structure. However, if the design process is not considered in detail, there will inevitably be unnecessary troubles:

A) blank allowance of the workpiece to be processed.

The size of the blank is too large, resulting in interference. So we must prepare the rough drawing before design. Leave enough space.

B) chip removal smoothness of fixture.

Due to the limited machining space of the machine tool, the fixture is often designed in a compact space. At this time, it is often ignored that the iron chips generated in the machining process accumulate at the dead corner of the fixture, including the poor flow of chip liquid, which brings a lot of trouble for later processing. So at the beginning of practice, we should consider the problems in the process of machining. After all, the fixture is based on improving efficiency and convenient operation.

C) overall opening of fixture.

Neglecting the openness makes it difficult for the operator to install the card, which is time-consuming and laborious.

D) basic theoretical principles of fixture design.

Each set of fixture has to go through countless clamping and loosening actions, so it may meet the user’s requirements at the beginning, but the fixture should have its accuracy retention, so don’t design something contrary to the principle. Even if you can get away with it now, it won’t last long. A good design should be tempered by time.

E) replaceability of positioning elements.

The positioning element is seriously worn, so it should be considered to replace it quickly and conveniently. It is better not to design it as a large part.

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The accumulation of fixture design experience is very important, sometimes design is one thing, in practical application is another thing, so good design is a process of continuous accumulation and summary.

KYLT Precision CNC machining services (milling & turning service), Fast prototyping, Fixture/Jig/Tooling making, Aluminum die casting & plastic injection parts. Email:cnkylt@aliyun.com +008615195010186

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What is the standardization of fixture design?最先出现在CNC Machining|CNC Milling & Turning Services|CNC turned parts|。

JIG design

KYLT Precision CNC Machining — Tue, 29 Oct 2019 19:50:30 +0000

Jig/Fixture design is generally carried out in accordance with the specific requirements of a certain process after the formulation of the machining process of parts. The possibility of fixture realization should be fully considered in the formulation of process. When designing jig, if necessary, modification suggestions can be put forward for the process.

The Jig design quality should be measured as per following standard:

the machining quality of workpiece can be stably guaranteed
the production efficiency is high
the cost is low
the chip removal is convenient
the operation is safe
labor-saving
the manufacturing and maintenance are easy

Precision Accuracy CNC WEMD, Milling & Assembly part

Basic Principles of Jig design

Meet the stability and reliability of workpiece positioning during use;
There is enough bearing or clamping force to ensure the processing process of workpiece on tooling fixture;
Meet the requirements of simple and fast operation in the clamping process;
Vulnerable parts must be of a structure that can be replaced quickly, and it is better not to use other tools when conditions are sufficient;
Meet the reliability of repeated positioning of fixture during adjustment or replacement;
Try to avoid complicated structure and high cost;
Select standard parts as component parts as much as possible;
Form the systematization and standardization of the company’s internal products.

CNC machined plastic parts and assembly for solar panel holding

Basic knowledge of Jig design

A good jig must meet the following basic requirements:

The key to ensure the machining accuracy of workpiece lies in the correct selection of positioning datum, positioning method and positioning elements, and the analysis of positioning error if necessary. Attention should be paid to the influence of the structure of other parts in the fixture on the machining accuracy to ensure that the fixture can meet the machining accuracy requirements of workpiece.
The complexity of the special fixture for improving production efficiency should be adapted to the production capacity. Various fast and efficient clamping mechanisms should be adopted as far as possible to ensure convenient operation, shorten the auxiliary time and improve production efficiency.
The structure of special fixture with good process performance shall be simple and reasonable to facilitate manufacturing, assembly, adjustment, inspection, maintenance, etc.
The fixture with good performance shall have sufficient strength and rigidity, and the operation shall be simple, labor-saving, safe and reliable.
On the premise that the objective conditions permit and are economical and applicable, pneumatic, hydraulic and other mechanical clamping devices should be used as far as possible to reduce the labor intensity of the operator. The fixture shall also be convenient for chip removal. If necessary, the chip removal structure can be set to prevent the chip from damaging the positioning of the workpiece and damaging the tool, so as to prevent the chip from accumulating and bringing a lot of heat to cause the deformation of the process system.
Special clamps with good economy shall adopt standard components and structures as much as possible, and strive to be simple in structure and easy to manufacture, so as to reduce the manufacturing cost of clamps. Therefore, in order to improve the economic benefit of fixture in production, the necessary technical and economic analysis should be carried out according to the order and production capacity.