JPS6054840B2 - fast dining press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-vibration, high speed drive type dining press suitable for mass production of small electrical items etc. by press working.

As is well known, unlike other press machines, dining presses are capable of high-speed operation, and with the recent development of electronic equipment such as radios, televisions, electronic computers, and NC numerical control devices, these small electrical appliances It has become widely used for press processing of parts, and its structure is gradually becoming larger due to the demand for improved production efficiency. The problem is that the ram rod that lowers the product stretches, making it impossible to hold the mold accurately.Also, the rotational balance of the crankshaft and the lifting and lowering balance of the ram are poor. It is considered impossible to increase the rotation speed of the machine to more than 300 times per minute, as this will not only significantly reduce the machining accuracy but also shorten the useful life of the mold. This had become the biggest difficulty in achieving higher precision products.

The invention for solving the above problem is disclosed in Japanese Patent Application No. 1527-1527 filed by the applicant.
4748) and Japanese Patent Application No. 52-15273 (Japanese Patent Publication No. 54-2474).

Both of these inventions are truly groundbreaking in that they incorporate original creativity into the structure of the crankshaft, the ram elevating mechanism that interlocks with it, and its balance adjustment device. The operating balance of each part is very good, with almost no vibration occurring, and the rotation of the crank part and the lifting and lowering of the ram part can be performed extremely smoothly and accurately, and the processing accuracy of the product can be maintained even when the machine is driven at high speed. There is no risk of deterioration, and it also has excellent usage functions that can greatly extend the service life of machines and molds, and has currently achieved great results in the efficient mass production of small electrical parts etc. by press machining. It's happening. The present invention was developed to further improve the structure of the high-speed dining press and to further improve its performance. Specifically, the present invention is provided with a crankshaft balance adjustment device facing each other on both sides outside the machine frame. This reduces the overall height of the machine, making it more compact and easier to handle.The ramrod that raises and lowers the punch plate is smoothly guided by a ball slide on the top of the machine frame, and the ramrod and balance weights on the left and right sides can be easily guided. By installing air cylinders at the lower ends of each, the play between the related parts that transmit power from the crankshaft to the punch plate is minimized, and the processing accuracy of the product is further improved when the machine is driven at high speed. It is designed so that it can be improved.

Hereinafter, the structure and operating state of the high-speed dining press according to the present invention will be explained in detail with reference to the drawings of the embodiments. Crankshaft 1
A flywheel 3 that also serves as an input pulley is attached to one end, and an air clutch is attached to the other end.Power transmission parts such as an electromagnetic brake (not shown) are attached to the other end. It is designed to rotate at the desired speed,
This point is basically the same as the conventional dining press, but in the case of the present invention, a pair of left and right main crank parts 1a, 1a are located on the part of the crankshaft 1 located inside the machine frame 2, and a pair of left and right main crank parts 1a, 1a are located outside the machine frame 2. Sub-crank parts 1b, 1b are provided at the part where the main cranks 1a, 1a are shifted in phase by 180 degrees. The main connecting grooves 7, 7 for transmitting the data to the ram are suspended downward. A ram block 8 is rotatably fitted and straddles the lower ends of the rods 7, 7.
are connected by pins 9, 9, and the four corners of the ram block 8 are fitted with ball slides 10 provided on the upper wall 2c of the machine frame 1 and slide metals 1, 1 provided on the lower wall 2d, and are moved up and down. A punch plate 13 is provided so as to pass through and be fixed to the four ramrods 12 that are supported so as to straddle the upper projecting ends of the ramrods 12.

In addition, in the case of this embodiment, the ramrod 12 has a core rod 12a.
The core rod 12a is divided into two parts: a sheath tube 12b that fits into the sheath tube 12b, and
The core rod 1 is made of a steel material with high tensile strength, and the sheath tube 12b is made of a steel material with a high tensile strength, both of which have hardness and little deformation.
The upper and lower ends of 2a are passed through the holes of the punch plate 13 and the ram block 8, respectively, and the sheath tube 12b inserted into the outer peripheral surface of the intermediate portion of the core rod 12a is interposed between the ram plate 13 and the ram block 8. The punch plate 13 and the ram block 8 are connected to the ram rod 1 by strongly tightening the nuts 14 and 15 screwed onto the male thread at the end of the core rod 12a.
2, and an axial tensile force is applied to the core rod 12a of the ramrod 12, and an axial compressive force is applied as a preload to the sheath tube 12b. It is designed to minimize elongation and deflection. Further, reference numerals 16 and 16 in the drawing indicate sub-connecting slots that hang down and are rotatably fitted to the sub-crank parts 1b and 1b of the crankshaft 1.
Balance weights 17, 17 for adjusting the rotational balance of the crankshaft 1 are connected and fixed to the lower end of the shank with pins 18, 18, and between the front and rear walls 2e, 2f of the machine frame 1 and the balance weights 17, 17. Ball guides 19, 19 are interposed therebetween to guide the weights in the vertical direction, and furthermore, the four ramrods 12 and the left and right balance weights 17 are provided with ball guides 19, 19 interposed therebetween, on the lower end surfaces of which they are always directed upward. Air cylinders 20 and 21 to be energized are installed with their piston rods 20a and 21a abutting each other.

Since the high-speed dining press according to the present invention has the above structure, when the crankshaft 1 rotates, the rotational motion is transmitted to the lower ram block 8 as a reciprocating motion in the vertical direction through the main connecting rods 7, 7, and the four Ramlot 1
2, the punch plate 13 at the upper end of the rod 12 is raised and lowered, and at the same time, the auxiliary connecting bolt 16 fitted in the auxiliary crank part 1b of the crankshaft 1 moves in the opposite direction to the main connecting bolt 7. , the balance weight 17 connected to the lower end of the ram block 8
In order to move up and down in the completely opposite direction, punch plate 1
3 moves to the lowest position of the presser operation, that is, when the main crank part 1a of the crankshaft 1 rotates to the bottom dead center, the balance weight 17 attached to the lower end of the sub connecting rod 16 reverses. Since the crankshaft 1 moves to the highest position, the balance weight 17 connected to the lower end of the sub-connecting bolt 16 is attached to the sub-crank part 1b of the crankshaft 1.
The load necessary to pull the ram upwards is applied, and this opposing force acts as a balanced damping force on the ram's lifting and lowering parts, so that the accelerating mass near the lowest point of the ram's descent is significantly reduced. The position of the bottom dead center can be reliably regulated without having to equip a part of the mold with a stopper like in conventional press machines. This prevents phenomena such as vibrations and loud noises from occurring, and allows accurate mold pressing by smoothly lowering the ram.

In addition, in the case of the present invention, the balance adjustment device using the sub-connecting rod 16 and the balance weight 17 which are linked to the sub-crank part 1b of the crankshaft 1 is doubled and corresponds to both sides outside the machine frame 1. Therefore, in combination with the ball slide 10 at the upper end of the ram rod 12 and the ball guides 19 provided before and after the balance weight 17, the operation is extremely smooth and nimble, and an excellent balance adjustment effect can be achieved. This has the advantage that handling and operation of the machine is significantly easier because the overall height of the machine can be lowered and the machine body can be made smaller. are equipped with air cylinders 20 and 21 that always direct and energize these upwards, so that the crankshaft 1
Including the fitting part between the main and sub-connecting slots 7 and 16, and! The clearances that occur between the main and sub-connecting slots 7 and 16, the ram block 8 and the balance weight 17, and the ram rod 12 and the ram block 8 and punch plate 13 are minimized to prevent product damage when the machine is driven at high speed. This has the effect of significantly improving machining accuracy.

As mentioned above, unlike conventional dining presses, the high-speed dining press of the present invention is very small and easy to handle, and the rotational balance and vertical balance of each part of the machine when the crankshaft rotates at high speed is extremely good. Almost no vibration occurs, and the rotation of the crankshaft and the lifting and lowering of the ram can be performed smoothly and accurately, so there is no risk of reducing the machining accuracy of the product when the machine is driven at high speed, and the machine and the useful life of the mold can be greatly extended,
If this is used for the mass production of various small electrical parts and mechanical parts, the machine equipment costs are low, and together with this, it will have the excellent effect of producing high-precision products efficiently and at low cost. It is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an example of a specific implementation structure of a high-speed dining press according to the present invention, and FIG. 2 is a side view thereof. 1...Crankshaft, 1a...Main crank section, 1b...Sub-crank section, 2......
Machine frame, 2a, 2b...Side wall, 2C, 2d...
...Upper and lower walls, 2e, 2f...Front and rear walls, 3...
... Flywheel, 4 ... Air clutch, 5 ... Electric motor, 6 ... Belt, 7
...Main connecting nut, 8...Ram block, 9...Pin, 10...Ball slide, 11...Slide metal, 12
... Ramrod, 12a ... Core rod, 1
2b... Sheath pipe, 13... Punch plate, 14, 15... Nut, 16...
Sub-connecting slot, 17...Balance weight, 18...Pin, 19...Ball guide, 20, 21...Air cylinder 20
a, 21a... Piston rod.

Claims (1)

[Claims] 1. A crankshaft 1 is passed through the upper part of both side walls 2a, 2b of the machine frame 2 and fixed horizontally so as to be rotatable, and a pair of left and right main crank parts 1a, 1 are attached to the part of the crankshaft 1 located inside the machine frame.
a, and the main crank parts 1a, 1a are located outside the machine frame.
Sub-crank parts 1b, 1b are provided with a phase change of 180 degrees from the main crank parts 1a, 1a, main connecting rods 7, 7 are fitted into the main crank parts 1a, 1a, and a ram block 8 is attached to the lower end of the rod.
The upper wall 2c of the machine frame 2 is connected to the four corners of the ram block 8.
Four ram rods 12 which fit through the ball slide 10 provided on the lower wall 2d and the slide metal 11 provided on the lower wall 2d so as to be movable up and down are fixed. At the same time, the sub-crank parts 1b, 1b are connected with sub-connecting rods 16,1.
6 is fitted to connect the balance weights 17, 17 to the lower ends of the rods 16, 16, and an air cylinder that constantly urges the ram rod 12 and the balance weight 17 upward to the respective lower end surfaces of the ram rod 12 and the balance weight 17. A high-speed dining press characterized in that piston rods 20 and 21 of the cylinder are provided in abutment against each other.