GB2448178A

GB2448178A - Cylinder head grinding and milling machine

Info

Publication number: GB2448178A
Application number: GB0706672A
Authority: GB
Inventors: Hamid Ghiassy
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-05
Filing date: 2007-04-05
Publication date: 2008-10-08
Also published as: GB0706672D0

Abstract

A cylinder head grinding and milling machine comprises a worktable and a fixed stand located at the back of the worktable. An arm projects from the stand over the worktable and a rotatable grinding or milling tool head is mounted in the arm. The tool head can be fed towards and away from the worktable for working the surface of a cylinder head located thereon. Means for feeding the tool head are located at the front of the machine.

Description

* 2448178 Cylinder and Cylinder Head Surface Grinding Machine with

Fixed Stand in the Back of the Table and Feeding Mechanism in the Front of Rotary Head

Technical Field:

This invention is in the field of auto-mechanics especially repairing of engine cylinder and cylinder head.

Relevant Prior Art:

Some versions of this machine were manufactured and presented by Comec and Sceledume in Italy and Xxiang in China and other factories twenty years ago. All of the above mentioned brands have a rotary head system and the feeding is done by a lifting handle, which is installed on the top of the cylinder, and the pillar, which is installed on the end of the table and the head.

Assessment of Prior Technical Know-How: Many sensitive parts are installed in the back of the cylinder and the pillar. To feed, the pillar and the head should be moved by a handle which is also installed in the back of the machine and the user cannot easily use the gearbox engaging system which is installed in the back of the machine.

There should be approximately 0.04 mm free space between the cylinder and the pillar. The said free space is caused by head weight and the radial weight. The said reasons cause to create an angle between the head and the table/work piece.

Disclosure:

This invention is related to a kind of cylinder and cylinder head grinding and milling machine. The machine has its own fixed stand in the back, and the feeding mechanism, which is installed in the front of the rotary head. The micrometric control of feeding process has a provision.

The feeding mechanism is always installed in the end of the system and consists of some parts such as cylinder, up-lifter, pillar, bolt, pin, medium nut, up-lifter spring, spring pressure adjuster nut and pillar groove and nine pieces in the old machines.

The cylinder and the pillar are the most important parts, which have special sensitiveness and reduce the production cost of these grinding machines. (Fig. 1) All the above-mentioned parts and pieces have been omitted and only a fixed stand installed in this invention. The said change is the most important feature in this machine.

The fixed stand, which is installed in the back of the table, and the feeding mechanism, which is installed on the front of the rotary head, are the most important features of this invention and the method of the micrometric control of the feeding is changed.

The old machines have some shortcomings and defects, which are due to the unsuitable design as follows: The feeding mechanism of the old machine is always installed in the end of the machine and consists of some parts such as cylinder, up-lifter, pillar, bolt, pin, medium nut, up-lifter spring, spring pressure adjuster nut, and pillar groove, which are nine pieces in total.

The most important parts are the cylinder and the pillar, which have special sensitiveness. Both of them cause to decrease the production cost of these grinding machines. (Fig. I) AU the said parts are omitted and only a fixed stand is replaced in the new model.

(Fig. 2) The feeding mechanism of the old machines is installed in the end of the machine and the up-lifter bolt is connected to feeding handle through the pillar, which is pierced. It is impossible for an auto-magnetic gearbox to be installed in the old machines because the feeding handle is installed exactly on top of the pillar, so there is no space for an automatic gearbox to be fitted there. It is necessary to pay high cost to solve the said problem. (Fig. 3) It is possible to install an automatic gearbox on the top of the machine easily because there is no movable part in the new model. (Fig. 4) Since the pillar and the feeding mechanism are installed in the end of the old machines, the head should move up and down in order to feed the main head. The existing radial load on the pillar, practically sticks the pillar to the internal wall of the cylinder. If the free space between the cylinder and the pillar is more or less than the specified measure such as in old machines, the system cannot work smoothly. The pillar sticks to the cylinder at different points and thus feeding is not done properly.

Also the acceptable free space of approximately 0.04 mm between the cylinder and the pillar, which is due to the weight of the head and the effect of the radial weight, is transferred to the front of the head and causes an angle between the head and the

table, (Fig.5)

The feeding mechanism is transferred to the front of the rotary head and there is no movable part in our system. Since the weight and pressure of the spindle motor and other accessories act on a completely vertical direction to the feeding pillar, there is practically no side or radial weight on the feeding mechanism, so the system can be used with acceptable amount of free space and very high accuracy. (Fig.6) In old models, the spindle driving electromotor is installed in the main head. A long time is required to do the machine operations to carve out the place for the electromotor.

Since the electromotor operates also in a closed space, there is no room for heat exchange and the wire coil heats up, which leads to reduction of the lifespan of the electromotor. If the electromotor goes out due to voltage fluctuations or short circuit, then the whole spindle mechanism should consist of accessories such as holder of the grinding stone and rotor holding tray and they have to be dismantled and the core of the electromotor has to be coil wired again and put back in place and should be again adjusted. (Fig.7) The electromotor is installed on the main head and exactly on top of the pillar and the feeding mechanism in our model. It is possible to replace the electromotor with a proper one in a matter of minutes and it would not be necessary to change the adjustments in order to solve the problem. (Fig. 8) The main rotary head & pillar mechanism should move for feeding and it isn't possible for an indicator gauge or digital ruler to be installed to achieve 0.01 mm accuracy in the old machines. (Fig.9) But it is possible to install an indicator gauge or digital ruler for feeding with 0.01 mm accuracy in this invention, (Fig. 10) The feeding mechanism is installed in the end of the machine in the old models. If the system is raised up to a certain height, it will be difficult to access to the feeding handle and hence control it. (Fig. 11) Since all the controlling parts related to feeding mechanism are devised in the front of the new system, the height of the rotary main head is kept in the same way. The pillar and the spindle are the only parts which shuttle up and down to operate easily. (Fig. 12) To engage the gearbox mechanism, its lever should be pulled forward but due to the fact that it is not in an easily accessible position in the end of the rotary head of the old models, this will be a difficult task. But in our model, the gearbox can engage by turning on the easily accessible switch of the electromagnetic gearbox. (Fig. 13) and (Fig. 14) It is necessary to extend the dimensions of the pieces in the new model for grinding larger work pieces. The stand height can be extended together with suitably strong stand base, which matches the new dimensions. At the same time, transforming the feeding mechanism to the front of rotary head, this section gets heavier due to the weight of rotary head. If the grinding stones holder in the machines got off the balance even in the slightest amount, the head would shake and vibrate abnormally.

But our invention solves this problem.

Advantageous Effects: This machine has many advantages in comparison to the old models: -This machine has fewer constituent parts.

-The existing parts are simplified.

-There is no table deviation as the fixed stand is installed in the back.

-The spindle is devised vertically on the surface of the table because it is installed in the front of the head.

-The feeding is installed in the front of the head and it is not necessary for the head to move up and down.

-It is possible to control the operation of all the controlling parts of the machine in the front of the head.

-Reduction of production costs.

-It provides more safety to workers/users.

-It is easy to feed and control the machine.

-It is possible to install a pre-manufactured gearbox, which has no machine operation activity on the head.

-This system can increase the production speed.

Claims

Claims 1. This invention is the first rotary cylinder & cylinder head

surface-grinding machine with a fixed stand in the back of the table.
2. This invention has no cylinder, pillar, bolts, springs, up-lifter, nuts, medium nuts, etc.
3. The feeding mechanism is transferred to the front of the rotary head as claimed in claimi.
4. The electromagnetic gearbox is installed on the top of the fixed stand in order to control the loading in the front of the rotary head.
5. This system completely controls the feeding and machine operation stages in the front of the rotating head as claimed in claim2.
6. This invention controls the feeding by indicator gauge with 0.01 mm accuracy as claimed in calim4.