JPH02229697A - Press machine - Google Patents

Abstract

PURPOSE:To simplify construction and to assure high rigidity and high moving accuracy by forming the upper half part of a slide as a yoke and driving a slide by a yoke cam mechanism. CONSTITUTION:A sliding block 19 is moved in the transverse direction shown by an arrow A and in the vertical direction shown by an arrow B accompanying to the rotation of an eccentric part 10 around an eccentric axial line L2 when the eccentric driving shaft 9 is rotated around an axial line L1. The driving force in an arrow B direction is transmitted to the yoke 13 by the relation of the sliding block 19 permitted to be displaced relative to the yoke 13 in the arrow A direction and the yoke 13. A slide 12 supported to a frame is moved back and forth in the vertical direction (arrow B direction) by the fitting relation of an upper guide shaft 16 and a sliding bearing 7 and the fitting relation of a lower guide ring 18 and a sliding bearing 3 and the press working of a stock is executed between an upper die and a lower die 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press machine such as a power press, and more particularly to a press machine that employs a cork cam as a slide drive mechanism.

In the press machine that is to be solved, it is required that the relative movement between the upper die (including the punch) and the lower die attached to the slide and bolster be performed accurately. If the relative motion between the upper and lower molds is not accurate, not only will the mold life be shortened, but the product accuracy will also be impaired. Therefore, press machines are required to have certain static accuracy (when no load is applied) and dynamic accuracy (when processing load is applied).Static accuracy includes the parallelism between the lower surface of the slide and the upper surface of the bolster, and the vertical movement of the slide. The perpendicularity between the top surface of the slide and the top surface of the bolster, the gap M between the slide and the give, etc.As for dynamic accuracy, the "shake" in the horizontal direction of the slide, the thermal effect on the bottom dead center position of the slide (each (due to thermal deformation of parts)
etc. can be mentioned. As such, there are many conditions required of the slide, and it is no exaggeration to say that the accuracy of a press machine is determined by the quality of the slide.

On the other hand, the slide is expected to have sufficient rigidity as a structural member that receives work loads, and to be lightweight as a reciprocating member. However, ensuring rigidity and increasing the eaves κ are contradictory requirements, and mechanical designers struggle to find a compromise between them.

However, in a crank press that transmits the rotation of the crankshaft to the slide via a connecting rod, and the slide reciprocates along a guide member of the frame, the length of the connecting rod must be adjusted to ensure a predetermined slide stroke. The drive system, which converts rotational motion into reciprocating motion using two rotating pairs and joints, is complicated; ■ it is difficult to ensure the rigidity of the drive system; ■ the weight of the moving parts is large. , (2) It has drawbacks such as being disadvantageous in high-speed operation.

The present invention was devised against this technical background, and is designed to simplify the structure of the drive system, ensure the rigidity of the drive system, and reduce the weight of the moving members that make up the drive system. Its purpose is to improve the precision of the machine.

To solve the problem, the slide carrying the upper mold has an upper guide shaft vertically installed at its upper end and at least two lower guide shafts vertically installed at its lower end. At the same time, the upper guide shaft and the lower guide shaft are supported by a frame through bearings so as to be freely displaceable in the vertical direction, and one half of the slide is formed as a yoke, and within the yoke, both are horizontal surfaces. The upper inner wall of the formed yoke includes a sliding block having an upper surface and a lower surface parallel to the lower inner mold surface.
The eccentric drive shaft, which is housed so as to be relatively displaceable in the horizontal direction via the lower bearing and is supported by the frame and extends through the yoke, also passes through the circular central opening formed in the sliding block.
The radial part of the eccentric drive shaft is rotatably fitted into the central opening via a bearing, and there is no relative upward movement between the yoke, the sliding block, and the eccentric parts of the eccentric drive shaft. This is achieved by providing a IIIR press machine (hereinafter simply referred to as a press) in which a slide is reciprocated in the vertical direction via a sliding block by rotation of an eccentric drive shaft.

The eccentric part of the eccentric drive shaft, the sliding block, and the yoke of the upper half of the slide constitute a yoke cam, and when the eccentric drive shaft rotates, the sliding movement is allowed only in the lateral direction relative to the yoke. through the block to the yoke (i.e.
slide) moves back and forth in the vertical direction. At that time, the slide is attached to the upper guide shaft part that is erected at the upper end of itself, and the ■ end! T! It is guided by the frame via bearings in at least two lower guide shaft sections provided.

Example The illustrated embodiment will be described below.

FIG. 1 is a longitudinal sectional view of the brace 1 seen from the side, and the second
The figure is a longitudinal sectional view of the brace 1 viewed from the front. Breath 1
The frame consists of a bed 2 which is a lower member, and an upper member in which a column 4 is combined with a crown 6, and these upper and lower members are screwed together with a plurality of tie rods 8. There is. Column 4 on the left and right when viewed from the front
A cylindrical sliding bearing 5.5 is fitted into the through hole formed in the shaft, and an eccentric drive shaft 9 having an eccentric portion 10 having a circular cross section is supported through the sliding bearing 5.5. . In the figure, L1 indicates the center axis of rotation of the eccentric drive shaft, and L2 indicates the center axis of the eccentric portion 10. This eccentric drive shaft 9 is driven and rotated by a motor via a known power transmission mechanism (not shown).

The slide 12 is arranged within the central space 11 of the frame,
An upper guide sleeve 16 erected at its upper end is fitted into a cylindrical sliding bearing 7 attached to the crown 6, and at least two lower guides are vertically installed at a lateral protrusion 17 at its lower end. A ring 18 is fitted onto a cylindrical sliding bearing 3 supported by the bed 2.

The @ lines of the upper and lower guide shafts 16.18 are both parallel to the vertical line, and the slide 12 reciprocates in the vertical direction ( vertical movement).

Further, the upper half of the slide 12 is a yoke 13. The upper inner wall surface 14 and the lower inner wall surface 15 are both horizontal planes intersecting the vertical line at right angles. The eccentric drive shaft 9 not only passes through the yoke 13 but also extends through a sliding block 19 that is approximately square and cylindrical and housed within the yoke 13.
It also penetrates. The upper surface 21 and lower surface 22 of the sliding block 19 are both horizontal surfaces parallel to the upper inner wall surface 14 and lower inner wall surface 15 of the yoke 13, and the surfaces 21, 14fl!
, roller bearings 23 with cages between surfaces 22 and 15, respectively.
24 is interposed, and the sliding block 19 is moved in the forward direction (arrow A) inside the yoke 13 via this roller bearing 23.24.
(see).

The sliding block 19 has a circular central opening 20, into which the eccentric portion 10 of the eccentric drive shaft 9 is fitted via a caged roller bearing 25. Roller bearing 23
．． There is no room for relative displacement in the vertical direction between the sliding block 19 and the yoke 13 in which the roller bearings 24 are interposed, and between the sliding block 19 and the eccentric portion 10 in which the roller bearings 25 are interposed. It is assembled in a fitted state.

The slide 12, which is reciprocated in the vertical direction by the rotation of the eccentric drive shaft 9, carries an upper die 26 at its lower end,
Pressing is performed by the cooperative action of a lower mold 28 and an upper mold 26 fixed to a bolster 27 on the bed 2.

When operating the press 1 having such a structure, when the eccentric drive shaft 9 rotates around the axis L1, the eccentric axis L2
As the eccentric portion 10 rotates around Permissible sliding block 19 and cork 1
Due to the relationship between The supported slide 12 reciprocates in the vertical direction (direction of arrow B), thereby performing press working of the material between the upper die 26 and the lower die 28.

The features of this embodiment are as follows.

■The perpendicularity between the vertical movement (reciprocating movement) of the slide and the top surface of the bolster, that is, the accuracy of the movement of the slide, is determined by the ratio of the guide length (vertical length) and width of the slide, and the gap between the guide parts. In the press 1, the slide 12 is guided by the frame at the upper guide ring 16 and the lower guide shaft 18 portions that protrude from the upper and lower ends thereof. ), the ratio of the interval length (guide length) of the upper and lower guide wheels 16, 18 to that of the upper and lower guide wheels 16, 18 is sufficiently large, and high movement accuracy of the slide 12 can be ensured.

■For the reason stated in the previous section ■, the relative movement between the upper mold 26 attached to the lower surface of the slide and the lower mold 28 set on the bolster 27 is performed with high precision, making it possible to obtain high product processing accuracy. .

■The lower guide ring 18 is at the same height as the machining surface, so even if each component is deformed due to work load or heat generated during machining, changes in the relative positional relationship between the upper die 26 and the lower die 28 are minimized. can be suppressed to

(2) A structure in which the eccentric portion 10 of the eccentric drive shaft 9 is located inside the yoke 13 that is a part of the slide 12, and the driving force due to the eccentric rotation of the eccentric portion 10 is transmitted to the slide 12 via the sliding block 19 ( With a structure in which rotary motion is converted into reciprocating motion using rotating gears and sliding gears, the structure is simple with fewer components in the drive system, and the distance between the person and the output point is small, resulting in high rigidity of the component parts. Therefore, it is possible to ensure high movement accuracy of the slide 12.

■In relation to the previous item■, the short distance between the person and the output point means that the height (length) of the entire drive system, which mainly consists of the eccentric drive shaft 9 and the slide 12, should be made sufficiently small to reduce the length of the column 4. This means that it can be made shorter, and it is possible to improve the rigidity of the frame.

■Related to the previous items ■ and ■, the weight of the slide 12, which is a moving member, can be reduced, making it suitable for high-speed operation (ensuring high-speed stability).

In the embodiment described above, only one upper guide ring 16 was provided at the upper end of the slide, but two or more may be provided depending on the size and purpose of the press. In addition, the lower end protrusion 1 of the slide 12
As shown in FIGS. 3 to 5, at least two lower guide wheels 18 are provided perpendicularly to the press 7, depending on the size, purpose, workability, etc. of the press.

As is clear from the above explanation, the present invention employs a structure in which the upper half of the slide is formed as a yoke and the slide is driven by a yoke cam mechanism, resulting in a simple structure with fewer drive system components. This ensures high rigidity of the component parts and high movement precision of the slide, as well as accurate relative movement between the upper and lower molds, and a reduction in the size and weight of the drive system including the slide. Capable of high-speed operation.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a press machine according to an embodiment of the present invention as seen from the side, and FIG. 》, Figs. 3 to 5 are views showing the arrangement of the F section guide shaft provided at the lower end of the slide of the press machine (D-D line arrow diagram in Fig. 2). 1.・Press, 2...Bed, 3...Sliding bearing,
7... Slide bearing, 9... Eccentric drive shaft, 1o... Eccentric part, 12... Slide, 13... Yoke, 14...
... Upper inner lm, 15... Lower inner wall, 16... Upper guide shaft, 18... Lower' guide shaft, 19... Sliding block, 20... Circular center opening, 21...・Top surface, 2
2... Bottom surface, 23, 24. 25... Roller bearing, 26
-... Upper mold, 27... Bolster, 28... Lower mold.

Claims (1)

[Claims] (1) A slide that carries an upper mold paired with a lower mold placed on the bed of the frame via a bolster has an upper guide shaft erected at its upper end and a vertically installed lower end. The slide has at least two lower guide shafts, and is supported by a frame via bearings at the upper guide shaft and the lower guide shaft so as to be freely displaceable in the vertical direction, and the slide has an upper half formed as a yoke. ,
A sliding block having upper and lower surfaces parallel to the upper and lower inner wall surfaces of the yoke, both of which are formed as horizontal surfaces, is housed in the yoke so as to be relatively movable in the horizontal direction via upper and lower bearings. an eccentric drive shaft supported by a frame and extending through the yoke also passes through a circular central opening formed in the sliding block, and the eccentric portion of the eccentric drive shaft is rotatably supported by the It is fitted into the central opening, and there is no relative vertical movement among the eccentric parts of the yoke, sliding block, and eccentric drive shaft, and the rotation of the eccentric drive shaft causes sliding in the vertical direction via the sliding block. A press machine configured to be reciprocated.