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Design of hydraulic fixtures

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Fittings are the creation tools which will make the standard machine tool, even more adaptive to work as specific machine equipment. Manufacturing sectors have helped bring lot of revolutions in manufacturing technology, as a consequence of which usually several improvements like COMPUTER NUMERICAL CONTROL lathes, CNC machine middle, robotics and so forth have been designed. The fitting should be made to adopt cost effective manufacturing procedure so that it may be machined easily with a lower time. The various methodology and applications simply by various creators are examined in this paper.

Index Terms”Hydraulic fixture, accuracy, General Fixture, Production


A fixture is a work holding or supporting unit used in developing industry within a machining operation. Fixtures are crucial elements of mass production because they are required in many of the computerized manufacturing operations. The origin of fixtures may be traced to the Swiss watch and Clock industry. The design of a fixture can be described as highly sophisticated and challenging process. Hydraulic fixture supplies the manufacturer for flexibility in holding makes and increased accuracy, finely-detailed, reliability, and interchangeability in some parts. A clamping system that uses high-pressure liquids to power clamps and keep a work part in place is called a HYDRAULIC FIXTURE.

Stages in Fixture Design and style

A suitable definition of the functional requirements forms the base of the fitting design. The key task pertaining to fixture is usually to make the reloading and unloading process guaranteed reduce the denial rate. Primary analysis may take a few hours to many days to get complicated light fixture designs. Fixture design is actually a five-step problem-solving process. The steps are talked about in detail-

The first step : Define Requirements

In the first place the fixture design, a definite statement of the need with the fixture needs to be stated. The requirements should be explained as commonly as possible to comprehend the problems. The designer should know basic principles like ‘is the tooling be started out from existing one or a completely new tooling be designed? ‘

Step 2: Collect Information

Collect most relevant data. The main types of information would be the part explanation, process bedding, and equipment specifications. A comprehensive study of CNC equipment and component drawing must be done. Work-piece requirements, operation parameters, availability of tools, and workers must be considered at this stage simply.

3: Develop Multiple Options

This step in the process needs maximum creativeness and also a few experience. A designer ought to brainstorm for a number of good tooling alternatives, not only stick to a single path just. The designer’s aim at this point should be in adding alternatives and not deleting or getting rid of. At first founder should attract the part and the discovering points just before considering painting of the clamping devices.

Step 4: Choose the Best Option

The total price to produce the product will be sum of raw material set-up and tooling expense. This can be stated in terms of a formula:

Designer has to be able to take the decision which is the best suitable model among his alternatives. To take these types of decisions a single must consider both the economics and ergonomics of the design and style.

Step five: Implement the look

The last step of the fixture-design process involves reproducing the chosen design and style approach in reality. Last details happen to be decided, last drawings are manufactured, and the tooling is built and tested. Tolerances should also be mentioned. The next guidelines should be considered in improving its performance.

Key elements to be considered while creating a light fixture:

  • a. Research of workpiece and angles
  • w. Type and capacity in the machine
  • c. e. Availability of indexing devices and the accuracy.
  • d. farrenheit. Evaluation inside the performance outcomes of the machine.
  • elizabeth. g. Solidity of the equipment tool under consideration. f.
  • h. Analyze of ejecting devices, protection devices, and so forth
  • g. Required degree of the reliability in the function and quality to be produced.

Design of fitting whether it is manual or hydraulic is the same. The structure of the fixture must be completely rigid and heavy in order to avoid deformations and vibrations produced during machining.

A. Principles of Locations The location refers to the establishment of a desired romance between the workpiece and the fitting. The purpose of places is to clamp the workpiece so as to limit the movements of body system in as much directions as possible. For a strict work piece in space, there are six degrees of freedom describing the position and alignment of the job piece, while shown. They may have three thready motions and three rotational motions. Fig. Degrees of Flexibility of a Workpiece Guohua Qin et approach., focuses on the fixture clamping sequence. J Cecil recommended an innovative clamping design strategy.

M. Common finding principle can be: 3-2-1 principle: Three locating pins happen to be inserted inside the base in the fixed physique which busts five examples of freedom. Two more buy-ins are injected in a vertical plane of fixed physique which restricts three even more degrees of liberty. Another pin number in the second vertical face of fixed body, arrests the other one. And remaining 3 degrees of liberty may be busted by means of a clamping device. This process of locating a workpiece in a light fixture is called the “3-2-1” basic principle or “six point location” principle.

C. Clamping Principle The main purpose of clamping is to contain the wokpiece rigidly against the locators during engineering operations. The basic needs of your clamping program should be- clamping needs to be easy, speedy and steady, clamping really should not be affected by vibration or hefty pressure The workpiece getting clamped should not be damaged because of application of clamping pressure Whilst handling delicate components, the clamps ought to be provided with fibers pads.

D. Types of magnetic clamps Clamps has to be selected thoroughly according to the type of material and loading and unloading process. It also depends upon what area of using clamp on the workpiece. Several common various kinds of clamps offered are listed below:

  • Strap Grip
  • Heel Grip
  • Bridge Clamp
  • Screw Grip
  • Power Powered Clamping
  • Equalizing Clamps
  • Latch Clamp

Fixture design

To lower design expenses associated with fixturing, various clamping strategies have been created through the years to aid the fixture designer. Type of fixture be it manual or hydraulic is the same.

Any job holding fixture must satisfy three basic functions:

1) Situation the component accurately.

2) Support the part accurately.

3) Clamp the element accurately.

For developing fixture it is necessary to study element details that include part geometry, machining method, design and interpretation rules for the machining fixture. The fitting must fulfill the customer requirements and price range. In terms of limitations, there are many elements to be deemed, mainly dealing with: shape and dimensions with the part to become machined, tolerances, sequence of operations, engineering strategies, slicing forces, number of set-ups, set-up times, volume of material to be removed, batch size, creation rate, machine morphology, machine capacity, expense, etc . By the end, the solution can be characterized by the: simplicity, rigidity, accuracy, dependability, and economy.

To make a fitting following actions involved will be

  • ¢ Conditional design intended for fixture.
  • ¢ 3D modeling in a of the building software (preferably PRO-E CREO, Solidworks)
  • ¢ Set up
  • ¢ Analysis by using analysis computer software (preferably ANSYS).

If a fixture is pre-existing then the locations of the clamping points can be known, and it minimizes the work of actually finding centroid of component and finding suitable locating and clamping points.

Standards for Material Selection of Fitting

Mechanical Homes

The fabric must own a certain power and tightness. Selected supplies are examined for durability and stiffness values

Put on of Elements

It must be ensured which the selected components have enough wear resistance.


It is an important engineering style criterion for designs open to the environment for any longer time frame

Ability to Make

The fabric is very well capable of using for the design, it may be difficult to manufacture. If this assortment criteria is definitely neglected the manufacture method might be very expensive making it unprofitable as a business product.


Cost is a critical simple fact to consider when choosing materials for any certain style for most products because they are faced with a severe competition in the market.

The parts of fixture generally are:

A. Fixture Base Plate

M. Supporting Cylinder

C. Clamp and Hydraulic routine

Fixture Base Plate

Whilst designing base plate total length should be considered. By using the Roark’s Formula displayed in for platter design the base of fixture is designed. Making use of this formula we could calculate the thickness with the plate and stress. As well deflection in centre is calculated. Usually the material to get base plate, supporting tube and clamp are taken the same. Fig. Roark’s Solution After the calculations of the stresses in the platter it should be in comparison with the permitted stress in the material. As well as the plate must be safe in design. Even as we get the sizes and material, we produce the style in the building software.

Supporting Canister

Hydraulic cylinders are made by custom made requirements or ready obtainable cylinders can be found according to the push specification. These types of cylinders are known as ZPS (Zero Point System) quests. These ZPS modules are to be supported by helping cylinders which can be designed applying modeling computer software and then imported into ANSYS for examination and verification for a safe design. The results in ANSYS are compared to the components strength. There is not any specific strategies to design the supporting cyl and hence designed for the suitable dimensions according to the module dimensions.

The module is fixed to the component by means of nipples which are injected into this module and clamped together with the hydraulic pressure. From a layout standpoint, cylinders include six standard functional requirements:


Clamping mostly will depend on cutting forces Clamping power = Exactly where, FHC- having force Cyndrical tube bore size = d mm Piston area sama dengan 0. 785 d Therefore , the required cyndrical tube output force is attained and chosen.

Hydraulic Circuit

A hydraulic circuit is a system comprising an interconnected set of discrete components that transport liquefied. Circuit is the routing and control of a confined the liquid to apply power. This electric power is used to attain a specific function resulting in job being performed. Before the hydraulic circuit could be designed, the following things must be defined

Depending on the cutting forces and requirements the number of hydraulic cyl required for the fixture assembly is determined. After the selection of cylinders the final set up is done within the base plate and the hydraulic lines and circuits will be arranged to make ready for employ.


Research of fitting components is carried out in ANSYS for displacements and tensions individually. Then this complete assembled model is definitely analyzed and checked intended for the stresses. The stresses developed needs to be below the allowable fracture durability.

Basic structure Research

Shift Result

Stress Result

Light fixture Bod Fixture assembly

According to Deepak G. Pawar and Dr . M. M. Tayde The cost personal savings calculated intended for manual and hydraulic light fixture is big and in support of this statement a stand formed can be shown Period taken to get machining one component with manual fitting =35hrs Cost of machining with manual light fixture =35*600= Rs. 21000 Labor cost intended for machining one component=35*50= Rs. 1750 System cost=8*50*2=Rs. 800 Variable cost of one aspect with manual fixture=Rs. 23550 Time used for machining with ZPS fixture =21hrs Cost of machining with ZPS fixture =21*600= Rs. 12600 Labor cost for machining one part =21*50= Rs. 1050 Variable cost of 1 component using ZPS fixture=12600+1050= Rs. 13650 Profit/component = (23550-13650) =Rs. 9900 An additional cost justification of applying hydraulic fixtures is given by simply Komal Barge, Smita Bhise as PRICE JUSTIFICATION DESK

Applying this fixture Rs. 80000 will be saved in a single month. Consequently the targets set with the first will be satisfied in the event that one follows the procedure.

Bottom line

Rendering of these features eliminates the necessity of human user for clamping of manifolds. It minimizes the pattern time. The hydraulic light fixture will not only offers the repeatability and high efficiency, but offers a solution, which reduces work-piece distortion due to clamping and machining causes. Fixtures have direct influence on product developing quality, efficiency and cost. It also provides the accuracy inside 10 to 15 micron and now this can be a requirement of virtually any component or perhaps work-piece following machining. To satisfy the multifunctional and powerful fixturing requirements optimum design and style approach can be used to provide complete analyses and determine an overall optimal design and style.

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Category: Research,

Topic: Design style,

Words: 2293

Published: 01.08.20

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