JPH03142140A - Machining method with transfer machine - Google Patents

Abstract

PURPOSE:To enhance the versatility by forming a tab, to be clamped at machining, in parts below the product form part as protruding in advance in a single piece at the product shape part, and previously forming a reference locate hole in a three-dimensional position integrated among works having different specifications. CONSTITUTION:In processing with a transfer machine of independent type, the positions of locate holes 10a, 10b formed in tabs 9a, 9b are integrated previously, so that both cylinder heads W1, W2 are carried in to the normal processing position in a jig 20 while a pawl 11 of a loading device 10 makes reciprocative motion of certain specified strokes, and at once the condition as capable of locating and clamping is obtained. Therefore, there is no need for readjustment of the pawl 11 strokes in conformity to the specifications of the cylinder head. Further, even a locate pin and a clamper on the jig 20 side can be used compatible between cylinder heads having different specifications.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for machining a workpiece, such as a cylinder head of an internal combustion engine, using a transfer machine.

BACKGROUND ART Conventional techniques and their problems For example, cylinder heads of internal combustion engines are subjected to machining such as drilling after being cast, and most of this type of machining is performed by transfer machines. Since the shape of the work itself is complex when processing with a transfer machine, a pallet feed type transfer machine is often employed.

FIG. 7 shows an example of a pallet used in a pallet feed type transfer machine. The pallet 1 is equipped with a locate pin 2 and a clamper 3, and the cylinder head W, which is a workpiece, is positioned and clamped by these two. Ru. The pallet 1 is sequentially transported between processing stations by a transfer device (conveyance device) 4, and at a predetermined processing station, a locate pin 5 is moved.
It is clamped to a jig base 7 by a clamper 6 and subjected to pressure.

In this case, if a plurality of types of cylinder heads having different numbers of cylinders, valve train mechanisms, and other specifications are to be machined using the same transfer machine, the following problem will occur. In other words, the cylinder head is designed to be as thin as possible in order to reduce weight, and because it has many machined holes, including cast holes, specifications Common among cylinder heads with different 1
- It is difficult to form the location hole 8 at the location where the hole 8 is located. For this reason, it is necessary to prepare a dedicated pallet for each specification, on which a single cable pin 7 is provided at a position corresponding to each specification.

Therefore, considering the diversification of ball knots as described above, it is more advantageous to use a direct feed type or independent type transfer machine instead of the pallet feed type transfer machine described above. Here, an independent type transfer machine is a general-purpose machine that is specialized, and a single-purpose machine that is equipped with loading and unloading equipment, and the machines are connected by an accumulation conveyor. Defined as 176-type (for example, Cold Damage to Automobiles, Vol. 19, Automobile Manufacturing Methods (April 20, 1980), Sankaido 1)
85 and 94).

(7) However, when machining with F-type and independent-type transfer machines, (1. 10ke・-1・
There is no change in the fact that it is not possible to form a hole, and it is necessary to change the position of the "1-key" pin or clamper on the processing jig side according to the specifications of the workpiece.

In addition, in the case of the Gui 1 Noctofi F type, the claws for transporting the Tofunsfaber work must be replaced depending on the specifications of the work, and similarly, in the case of the independent type, the loading device (attached to the machine) must be replaced.
Is it necessary to change the workpiece transport line (transfer device) each time according to the specifications of the workpiece?

The present invention makes it possible to unify the log gate hole position for multiple types of workpieces with different specifications by making slight modifications to the workpiece side, thereby making use of the advantages of the die 1 noctofeed type and especially for independent 1. Provides a method that enables processing using a type of transfer machine. This is what we are trying to do.

Means for Solving the Problems In the present invention, for multiple types of workpieces with different specifications to be processed by a transfer machine, a tab to be clamped is integrated in advance from the product shape part to a part other than the product shape part. At the same time, a locating hole is formed in advance to fit a locating pin for positioning at a two-dimensional position that is unified among multiple types of workpieces with different specifications among these tabs, and to serve as a positioning reference. are placed one by one into the processing jig of the processing station using a direct transfer type transfer device, and the locating pins on the processing jig are fitted into the locating holes. It is characterized in that the tab is also clamped with a clamper on the cutting jig side, and a predetermined mechanical processing 1 is applied to the tab.

In other words, for example, the position of the location and hole can be standardized by 1' between cylinder heads of multiple Jjl'i types with different specifications.
Unify by ゜.

Specifically, for example, as shown in FIGS. 1(A) and (B), in two types of cylinder heads W and W2 having different specifications, tabs 9a and 9b are placed at positions where dimensions β1, 12, and 13 are equal, respectively. These tabs 9 are pre-protruded
Locate holes 10a and 10b are formed in holes a and 9b.

Please note that the tab is provided only for mechanical pressurization of the cylinder head and is completely unnecessary at the product stage.
Therefore, if there is a possibility that the tab may become an obstacle during the product stage, the tab may be removed after machining, or it may be left in place if it does not become an obstacle.

Taking the above-mentioned cylinder head as an example, when machining it with an independent type transfer machine, the positions of the locating holes 10a and 10b formed in the tabs 9a and 9b are unified in advance, as shown in Fig. 2. Therefore, when the claw 11 of the loading device 10 performs a reciprocating motion with a constant stroke, any cylinder head W1. W
2 is also carried into the regular machining position within the machining jig 20, and is immediately ready for positioning and clamping. Therefore, there is no need to readjust the stroke of the pawl 11 according to the specifications of the cylinder head.

Furthermore, the locate pin and clamper on the processing jig 20 side can be shared between multiple types of cylinder heads with different specifications, so it is necessary to change the position of the locate pin and clamper each time according to the cylinder head specifications. Nor.

Embodiment FIGS. 3 and 4 are diagrams showing a more specific embodiment of the present invention, and illustrate the case of the cylinder head described above.

As shown in the figure, the product shape portion Q of the cylinder head W1
A pair of tabs 9a, 9a are protruded continuously from the lower vertical wall surface of the product-shaped portion Q at other locations. These tabs 9a, 9a have a locating hole 10a that serves as a positioning reference during machining, and one end thereof is a reference surface (a surface that contacts the cylinder block when combined with the cylinder block, and is a surface that contacts the cylinder block when assembled with the cylinder block, Reference surface) F
It is formed so that it opens at the bottom. Please note that these tabs 9
a and 9a are clamped by a clamper during machining to be described later.

Here, the cylinder head W shown in FIGS. 3 and 4 is
1 is a type A cylinder head, and the cylinder head W2 shown in FIG. 5 is a type B cylinder head with different specifications, a plurality of tabs 9b, 9b are similarly formed for the cylinder head W2 of type B with different specifications. do. In this case, the three-dimensional positions forming the tabs 9b, 9b, that is, the tabs 9b, 9
Dimensions for b and locate hole lOb 1. , 12 and 13 are common to the A-type cylinder head W+ (FIG. 4), and the tabs 9a, 9b and locating hole 10a are provided between a plurality of cylinder heads WW2 having different specifications.

Unify the position of 10b. Furthermore, the same applies when there are C type cylinder heads with different specifications.

Therefore, the cylinder head W1゜W2 as shown in
When processing with the independent type transfer machine shown in Fig. 2 and Fig. 6, the cylinder head W1 or W2, which is the workpiece, is transported to the corresponding station by an inter-machine conveyor (not shown), and then used as a transport device. Claw 1 of loading device 10
1 (FIG. 2), it is carried into the processing jig 20.

In this case, the claw 11 comes into contact with the end surface P of the cylinder head W1 or W2, and the cylinder head W1 or W2
is pushed into the jig 20, so the claw 11 always performs a reciprocating motion with a constant stroke, so that the machining jig 2
It is carried to the normal position within 0. At this time, the other claw 11a (FIG. 2) comes into contact with the cylinder head W3 that has been previously machined, thereby pushing the machined cylinder head W3 out of the processing jig 20.

On the other hand, the processing jig 20 includes clampers 22a and 22b in addition to a plurality of locating pins 21, as shown in FIG. The locate pin 21 is the aforementioned location 1/hole 10a,
Since it is installed at a position corresponding to 10b, it is commonly used regardless of the specifications of the cylinder heads W, W2. Similarly, the clamper 22a also has the aforementioned tabs 9a and 9b.
Since it is provided at a position corresponding to the cylinder head W, W2, it is commonly used regardless of the specifications of the cylinder head W, W2. However, for one clamper 22b, only the claws 23a and 23b at the tip of the clamper 22b can be used depending on the specifications of the cylinder heads W, W2.

Therefore, as shown in FIG. 6, when the cylinder head W1 or W2, which is a workpiece, is carried onto the base 24 of the processing jig 20, the locate pin 21 moves upward to locate the locate hole 1.
By fitting with 0a or 10b, the cylinder head W1 or W2 is positioned. Then, at the same time that one clamper 22a rotates in the clamping direction and clamps the tab 9a or 9b, the other clamper 22b
Also, a part of the outer peripheral wall surface of the cylinder head W1 or W2 is clamped. In this case, in the case of the A-type cylinder head W1, the claw portion 23a of the clamper 22b controls the clamping, and in the case of the B-type cylinder head W2, the claw portion 231] controls the clamping. The clamping position by the clamper 221 is indicated by the symbol length "G" in FIGS. 4 and 5.

When the cylinder head W1 or W2 is positioned and clamped in this way, the cylinder head W1 to be machined is
Alternatively, the entire base 24 is indexed and rotated about the shaft 26 so that the machining surface of W2 is perpendicular to the spindle head 25, and then cutting is performed by the spindle head 25.

Effects of the Invention As described above, according to the present invention, it is possible to process multiple types of workpieces with different specifications to be processed by a transfer machine.
The tab that is to be clamped during machining by the machine 1 should be formed in a part other than the upper part of the product, and should be formed integrally with the product shape. Mechanical machining to a unified three-dimensional position between locations - [Positioning standards for location - 1~
This makes it possible to form the 9th hole, and as a result, there is a problem with the so-called mixed production system (the number of stages is 11 with different specifications on the same transfer machine). 411's 1. Pins, clampers, and even the claws of the conveyance device can be used in common, and there is no need to adjust or modify the conveyance stroke of the claws.

Therefore, even when machining workpieces with different specifications, there is no need to perform troublesome setup changes like in the past, and while taking advantage of the direct feed type, machining can be easily performed, especially with an independent type transfer machine, and the equipment greater versatility and flexibility.

[Brief explanation of the drawing]

Figures 1 (A) and (B) are diagrams showing one embodiment of the present invention, and are two-dimensional explanatory diagrams showing an outline of the workpiece to be machined, and Figure 2 is a diagram showing an example of the present invention. 3 is a front view showing details of a cylinder head as an example of a workpiece, FIG. 4 is a bottom view of FIG. 3, and FIG. 5 is a specification similar to that of FIG. 3. The bottom view of the different cylinder heads, Figure 6 is an enlarged explanatory view of the main part showing the state in which the workpiece (cylinder head) is positioned and clamped to the jig, and Figure '1 is the Pa1 knot feed type of Vermilion FIG. 2 is an explanatory diagram of the configuration of a pallet in the transfer machine. W,, W2・Cylinder head as work, 9a, 9
b...Tab, 10...Loading device as a transport device, 10a, 10b...Locate hole, 20...
Processing jig, 21... Locate pin, 22a, 22b...
Clamper, Q...Product shape part. 3

Claims (1)

[Claims] (1) For multiple types of workpieces with different specifications to be processed by a transfer machine, a tab to be clamped is formed in advance in a part other than the product shape part integrally protruding from the product shape part, and this tab is A locating hole is formed in advance at a uniform three-dimensional position among multiple types of workpieces with different specifications, and the locating hole is fitted with a locating pin for positioning to serve as a positioning reference. Place the pieces one by one into the processing jig at the processing station, position them by fitting the locating pins on the processing jig into the locating holes, clamp the tabs with the clamper on the processing jig, and then perform the specified machining. A machining method using a transfer machine characterized by applying.