JPH031268Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotary indexing type marking device for marking a workpiece.

(Prior Art) Generally, for example, when machining the inner surface of a cam cap that supports a camshaft on the cylinder head of an engine, the cam cap is assembled at a predetermined position on the cylinder head and machined at the same time as the cam support surface of the cylinder head. When assembling the camshaft, the cam cap is removed and then the camshaft is installed and reinstalled, but the cam cap must be installed at the same position as when machining the inner surface.

Therefore, conventionally, a cam cap attached to a cylinder head for internal processing is stamped with an identification symbol using a stamping device. The above-mentioned marking device is usually provided with a rotary index type in which a large number of marking punches are provided on a rotary body, and a predetermined marking punch is moved to a marking position by rotation of the rotating body, and the marking punch is moved to a pressurizing cylinder. Then, pressure is applied to stamp the workpiece (for example, see Utility Model Application No. 53-3618).

However, in the above-mentioned marking device,
When a large pressurizing reaction force during marking acts as a bending force on the support of the rotating body and the mounting section of the pressurizing cylinder, the rigidity of each part must be increased to accommodate this load, resulting in an increase in cost. It is something. In addition, with the above-mentioned marking device, the marking part must move to sequentially stamp multiple locations on the workpiece.
If the rigidity of the stamped portion is improved as described above, the rigidity of the mechanical portion for movement must also be improved, resulting in an increase in the size of the entire device.

In order to eliminate the influence of such pressure reaction force, as shown in Japanese Utility Model Application Publication No. 56-163598, a large number of stamping punches are installed parallel to the rotation axis of the rotating body.
There is a method that minimizes the pressure reaction force acting on the support part of the rotating body during marking, but there are many parts that face the workpiece, and in the case of a workpiece with an uneven shape, it is easy to interfere and has difficulty in applicability.

(Purpose of the invention) In view of the above circumstances, the present invention is designed to reduce as much as possible the bending force due to pressure reaction force acting on supporting parts such as rotating drums and pressure cylinders, regardless of the shape of the workpiece, and to reduce the rigidity of each part. It is an object of the present invention to provide a rotary indexing type stamping device which is designed to reduce the amount of damage.

(Structure of the invention) In the marking device of the invention, a rotating drum with one side of the peripheral wall closed by a side wall is supported by a horizontal axis on a base, and marking punches are attached to the peripheral wall of the rotating drum so as to be movable in the radial direction. A large number of 180-degree compatible pairs are provided, and the base on the opposite side of the rotating drum peripheral wall has a pair of rods in opposite directions that protrude from both sides in the axial direction and can press the inner ends of the pair of marking punches. A pressure cylinder is provided wrapped inside the circumferential wall of the rotating drum, and a base on the opposite side of the rotary drum from the work placement position outside the circumferential wall when viewed from the rotating drum,
When one rod of the pressure cylinder applies pressure to the marking punch facing the workpiece, the other rod applies pressure via the marking punch on the opposite side to the marking punch facing the workpiece, and receives the pressure reaction force. It is characterized in that a member is provided.

(Effects of the invention) According to the invention, a large number of marking punches are arranged in the radial direction on the peripheral wall of the rotating drum, and except for the marking punches necessary for marking work, they are relatively separated from the workpiece, and the unevenness of the workpiece is Engraving work can be carried out smoothly without being affected by
When one rod of the pressure cylinder is extended and the stamping punch is pressurized for stamping, the other rod is also extended in the same way and pressurizes the receiving member of the base via the stamping punch on the opposite side, causing a pressure reaction accompanying stamping. Since the force is received by the receiving member, the pressure reaction force at the time of stamping does not act as a bending force on the rotating drum and the support part of the pressure cylinder, and the rigidity of each part is designed to be relatively small. This makes it possible to reduce weight and improve durability at low cost.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
FIG. 1 is a partially sectional side view of the marking device of the present invention, and FIG. 2 is a sectional front view taken along the line - in FIG.

The rotary indexing type marking device 1 includes a rotating drum 2, and the rotating drum 2 has an annular peripheral wall 2a on the outer periphery.
is closed on one side by a side wall 2b, and this peripheral wall 2
It has a structure in which the other side of a is open, and a horizontal shaft 3 is provided on this side wall 2b from the outside. The horizontal shaft 3 is supported by a first bracket 4a of a base 4 via a bearing 5 so as to be freely rotatable in the horizontal direction.
As a result, the rotating drum 2 is installed such that the peripheral wall 2a rotates in the vertical direction within a vertical plane.

The base 4 has a first bracket 4a and a second bracket 4b arranged facing each other in the vertical direction from an upper horizontal base 4c, and both brackets 4a, 4b.
The rotating drum 2 is configured to rotate during this period.

Engraving punches 6 are slidably disposed on the peripheral wall 2a of the rotary drum 2 at equal intervals radially from the center of rotation by the horizontal shaft 3. A pair of marking punches 6a and 6b located on opposite sides of the center point are located on the same center line. This stamping punch 6 includes a punch body 7 that is supported so as to be movable in the radial direction through the peripheral wall 2a, and the tip of the punch body 7 has a stamping surface 8 at the center of the tip.
A stamp 8 formed on a is removably attached by a stamp exchange lever 9. Further, the punch body 7 is prevented from moving toward the center by coming into contact with the outer circumferential surface of the peripheral wall 2a by a locking part 7a formed on the outside of the tip, while a spring formed on the inner end It is biased toward the center, that is, in the retracting direction, by a spring 10 compressed between the receiver 7b and the inner peripheral surface of the peripheral wall 2a.

The horizontal axis 3 of the rotating drum 2 is connected to the first axis of the base 4.
The rotary drum 2 is connected to a rotary indexing motor 11 attached to the bracket 4a, and the rotary drum 2 is rotationally driven by the rotary indexing motor 11, and stop control is performed so that a predetermined stamping punch 6 moves to the lower central marking position. be done. Moreover, the rotational position is detected by the rotary encoder 12. Note that the workpiece W to be engraved is carried below the rotating drum 2,
An engraving is made at the engraving position of the workpiece W by an engraving punch 6 located below the center.

Furthermore, in the peripheral wall 2a of the rotating drum 2,
A pressurizing cylinder 14 is inserted from the side opposite to the horizontal shaft 3. This pressurizing cylinder 14 is connected to the base 4
It is fixed to the side surface of the tip of the second bracket 4b. This pressure cylinder 14 is disposed in the vertical direction, and is provided with a pair of upper and lower rods 15 and 16 on both sides of the pressure cylinder 14, which extend and contract on the center line of the rotating drum 2 in the vertical direction. An upper piston 17 is attached to the base of the upper rod 15, and a lower piston 18 is attached to the base of the lower rod 16, and these are housed in the cylinder 14 so as to be slidable.
Working pressure is supplied to the lower chamber 14c and the middle chamber 14b between the pistons 17 and 18. The upper chamber 14a and the lower chamber 14c are connected to the same working pressure line, and when the working pressure is supplied to the middle chamber 14b between the pistons 17 and 18, both rods 15 and 16 are operated to extend in opposite directions, and the upper and lower chambers 14a, When the working pressure is supplied to 14c, it is contracted. The tips of the upper and lower rods 15 and 16 press the inner ends of the marking punch 6 located at the lower marking position of the pressure cylinder 14 and the marking punch 6 located at the opposite upper position, respectively, to make the marking. The punches 6, 6 are configured to move in the outer circumferential direction against a spring 10.

Further, a receiving member 20 is provided on the bottom surface of the horizontal base portion 4c of the base 4 above the rotating drum 2. The lower end surface of the receiving member 20 can come into contact with the tip of the upper marking punch 6 located on the vertical center line of the rotary drum 2 . That is, when the rods 15 and 16 of the pressure cylinder 14 are extended, the receiving member 20 comes into contact with the tip of the marking punch 6 raised by the upper rod 15, and applies the pressing force, that is, the marking reaction force. It is something you receive. A recess 20a is formed in the center of the tip of the receiving member 20, so that the outer tip comes into contact with the tip surface of the punch body 7 so as not to directly contact the stamp surface 8a of the stamp 8 of the stamp punch 6. It is configured to receive pressurizing force.

The base 4 holding the rotating drum 2, the pressure cylinder 14, etc. is supported by an upper front-rear slide unit 21 extending in the front-rear direction along the axis of the horizontal shaft 3, and is movable in the front-rear direction. Further, this front and rear slide unit 21 is further supported by a left and right slide unit 22 at the upper part and is provided so as to be movable in the left and right direction, and its movement is driven by a drive mechanism (not shown) to bring it to a predetermined marking position on the workpiece. It will be stopped accordingly.

To explain the operation of the above embodiment, the rotary indexing motor 11 is driven to drive the rotary indexing motor 11 to move the marking punch 6 having the marking 8 corresponding to the symbol etc. to be stamped to the lower central marking position on the workpiece W located below. After moving and stopping, the pressurizing cylinder 14 is operated to extend the upper and lower rods 15 and 16. As the lower rod 16 expands, its tip comes into contact with the base end of the marking punch 6 and pushes down the marking punch 6, pressing the tip marking surface 8a against the marking portion of the workpiece W to perform marking. On the other hand, as the upper rod 15 expands, its tip comes into contact with the base end of the upper stamping punch 6 and pushes up the stamping punch 6, and the tip comes into contact with the receiving member 20 of the base 4, causing this receiving Member 20
As a result, the pressure reaction force caused by the pressure stamping of the lower rod 16 is received. After pressure stamping, the pressure cylinder 14 is contracted to tighten the upper and lower rods 1.
5 and 16 are recessed and the rotary drum 2 is allowed to rotate, the above operation is repeated to sequentially apply markings.

Therefore, the pressure reaction force accompanying the marking is applied to the receiving member 20.
A bending force acts directly on the horizontal base 4c of the base 4 through the bending force on the first bracket 4a supporting the horizontal shaft 3 of the rotating drum 2 or the second bracket 4b supporting the pressure cylinder 14. However, the required strength of the brackets 4a, 4b becomes lower.

An example of a workpiece W to be marked by the marking device 1 is a cylinder head 25 of an engine as shown in FIGS. 3 and 4. Intake and exhaust camshafts 26, 26 are disposed on both sides of the upper surface of the cylinder head 25, and the camshafts 26, 26 are connected to a support portion 25a on the upper surface of the cylinder head 25 and a semicircular shape that is attached from above. It is rotatably supported by a cam cap 27. The cam support portion 25a of the cylinder head 25 and the bearing surface of the cam cap 27 are
Both parts are assembled together and then machined.
In the assembled state during this processing, the marking punch 6 of the marking device 1 of the present invention is used to sequentially mark the upper center of each cam cap 27. After processing, the cam cap 27 is removed once and the camshafts 26, 26 are reattached. After installation, the same cam cap 27 is assembled at the same position.

FIG. 5 shows the stamping process performed by the above-mentioned stamping device 1. First, the cylinder head 25 is carried in from the right side of the figure by a conveyor 28, and at the preceding tightening station A, the cylinder head 25 is inserted into the cylinder head 25. Cam cap 27 to nut runner 29
It is installed by tightening the bolts.
The cylinder head 25 to which the cam cap 27 is attached as described above is conveyed to the stamping station B, and the stamping device 1 stamps the cam cap 27.
The markings are made sequentially at predetermined marking positions. Thereafter, the cylinder head 25 is transported to a processing station (not shown).

According to the embodiments described above, the strength structure against pressure reaction force is simple, and a durable device can be constructed at low cost.

[Brief explanation of drawings]

Fig. 1 is a side view partially showing a rotary indexing type stamping device according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is an example of a workpiece. A plan view showing the cylinder head of
FIG. 4 is a side view of the same, and FIG. 5 is a schematic configuration diagram of a pressure line showing an example of installation of the marking device. 1... Stamping device, 2... Rotating drum, 2a...
Peripheral wall, 3... Horizontal axis, 4... Base, 6... Engraving punch, 7... Punch body, 8... Engraving, 10...
Spring, 11... Motor, 14... Pressure cylinder, 15, 16... Rod, 20... Receiving member, W... Work.

Claims (1)

[Scope of utility model registration request] A rotating drum with one side of the circumferential wall closed and the other side open is supported by a horizontal axis using the side wall as a base, and engraving punches are mounted on the circumferential wall of the rotating drum in pairs that correspond 180 degrees to each other and are movable in the radial direction. On the opposite side of the base from the rotating drum circumferential wall, there is a pressure cylinder that protrudes on both sides in the axial direction and has a pair of rods in opposite directions that can press the inner ends of a pair of marking punches. The base is provided so as to wrap around the inside of the peripheral wall of the rotary drum, and on the opposite side of the rotary drum from the work placement position on the outside of the peripheral wall when viewed from the rotary drum.
When one rod of the pressure cylinder applies pressure to the marking punch facing the workpiece, the other rod applies pressure via the marking punch on the opposite side to the marking punch facing the workpiece, and receives the pressure reaction force. A rotary indexing type stamping device characterized by being provided with a member.