JPH0331519Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a positioning mechanism for a mold changing device in a C-type press.

``Prior Art'' Conventionally, a ring-shaped bolster is rotated horizontally around a C-type press, and a plurality of molds attached to the bolster are sequentially supplied to the lower side of the slide of the press, thereby forming mold stages. There is a technology that greatly reduces the time spent on replacement and efficiently performs several types of press processing.In this case, recesses are formed at equal intervals on the bottom of the bolster as a means of positioning each mold with respect to the slide of the C-type press. This was done by fitting the piston rod of the air cylinder with the piston rod, or by attaching the molds to the bolster at equal intervals and controlling the rotation speed of the drive motor that rotated the bolster.

``Problems to be solved by the invention'' However, positioning may be affected by the gap between the recess and the piston rod, the backlash of the gear that interlocks the drive motor and the bolster, and the error in the equal division of the recess and the bolster for the mold. The accuracy will be low, and this will cause problems when clamping the shank of the upper die to the slide of the C-type press later, as well as during the actual press working. Another problem was that an expensive machine tool was required to form the mounting holes in the mold.

"Means for Solving the Problem" However, the present invention rotates an annular bolster horizontally around a C-type press, and sequentially supplies a plurality of molds attached to the bolster to the lower side of the slide of the press. In the positioning mechanism of the mold changing device, the lower mold of the mold is placed on the upper surface of the symmetrical position with respect to the center point of the bolster on the center line of the bolster, and a removable positioning key is provided on the outer peripheral side lower surface of the symmetrical position. A key hole is provided in the bed that supports the bolster, and a key hole is provided in the bed that supports the bolster, and the key hole is fitted with the positioning key to fix the bolster at the set position, and the raised and lowered movement of the bolster by the lifting member and the rotation by the rotating member are provided. During operation, these positioning keys and keyholes are appropriately fitted at the bolster setting position.

"Operation" Therefore, according to the present invention, the positioning key and the fitting means can be fitted and fixed with the minimum gap, and by separately positioning the two molds located at symmetrical positions on the bolster, Compared to the method in which all the molds to be attached to the bolster are positioned at the same time, there is no need to attach each mold to the bolster at equal intervals, and post-processing of the bolster can be done without using expensive machine tools, making it easier to apply to the bolster. With easy and highly accurate positioning, the mold can be replaced accurately and the pressed products can be made uniform with high accuracy.

"Embodiments" Examples of the present invention will be described below based on the drawings. Fig. 1 is a plan view of the bolster part, Fig. 2 is a front view of the whole, Fig. 3 is a side view of the same, and Fig. 4 is a side view of the bolster part. The C-type press 2 is provided with an annular bolster 3 that stands upright in the inner hole, and the C-type press 2 is centered at the center 0 of the bolster 3.
A rear bed 5 is arranged at a symmetrical position to the head 4,
The bolster 3 is horizontally supported via these beds 4 and 5. In addition, air cylinders 8, which are elevating members that rotatably support rubber rollers 7 at the tip of the piston rod 6, are arranged at approximately 120 degree intervals on the bottom surface of the bolster 3, and each roller 7 is connected to a circular guide groove on the bottom surface of the bolster 3 near the inner circumference. 9, and
A drive motor 12, which is a rotating member, is provided which is interlockingly connected to the support shaft 10 of one of the rollers 7 via a flexible shaft 11, and the bolster 3 is lifted and supported from each bed 4, 5 and rotated in one direction. Configure it as follows.

In addition, 13 in the figure is approximately on the inner circumferential side of the bolster 3.
Centering members 14 are arranged at 120 degree intervals to prevent eccentric rotation, and are arranged on the outer circumference side of the bolster 3 on both sides of the bed 4, and on the inner circumference side of the bolster 3 in front of the rear bed 5. 4 and 5, and a case in which the rear bed 5, each air cylinder 8, the drive motor 12, each centering member 13, and each clamp 14 are installed and fixed on the outside of the lower part of the C-type press 2. They are connected and fixed to the machine base 15, respectively.

By the way, eight types of molds 16 according to product type and process are attached to the bolster 3 at approximately equal intervals.
The mold 16 includes a die part 17 which is a lower mold, a punch part 20 which is an upper mold which forms a shank 19 which is integrally connected to the slide 1 via a hydraulic clamp 18 and projects from the center of the upper surface, and a punch part 20 which is an upper mold. On the other hand, it consists of a pair of left and right guide rods 21 that guide the punch part 20 up and down while maintaining its positional relationship, and the diameter of the shank 19 of the mold 16 is unified.

Then, the bolster 3 is divided into approximately eight equal parts (θ ₁ ≒ θ ₂ ≒
Punched holes ₂₂ are formed at symmetrical positions around the center 0 on the four center lines A ₁ , A ₂ , A ₃ , A ₄ (θ 3 ≒ θ ₄ ).
At the same time, under the same conditions, a short axis-shaped positioning key 24 having a tapered edge is integrally connected to the bottom surface near the outer periphery of the bolster 3 via an embedded port 23, and the bolster 3 is formed around the punched hole 22.
While each die part 17 is installed and fixed on the upper surface, when the punched hole 22 is located accurately below the hydraulic clamp 18, it is symmetrically positioned on the center line A ₁ to _{A 4} where the punched hole 22 is arranged. A switch 26 is provided with a certain positioning key 24 and a key hole 25 that is fitted and fixed to each of the beds 4 and 5 with a minimum clearance, and outputs an output for each rotational position of the bolster 3 where these keys 24 and key holes 25 can be fitted. are attached to the rear bed 5, and each mold 16 for the slide 1 is attached to the rear bed 5.
It is configured to perform positioning.

The present embodiment is constructed as described above. First, the die part 17 of each mold 16 is installed and fixed on the bolster 3 centering on the punched hole 22, and one of the molds 16 is attached to each air cylinder of the bolster 3. 8
Then, the slide 1 is moved downward by the raising → rotation → lowering operation by the drive motor 12, and the mold 16 is moved downward.
Set the height of slide 1 to the height, lower this slide 1 by an inch to the bottom dead center, and hydraulic clamp 1
With the shank 19 of the punch portion 20 clamped at 8, the key 24, which has been previously fitted into the key hole 25 of the bed 4 from below, is integrally connected to the bolster 3 using the embedded port 23, and then the clamp 18
Release it and raise slide 1 by an inch to the top dead center. Next, the air cylinder 8 raises the bolster 3 again and pulls out the key 24 upward from the key hole 25 of the bed 4. After turning the bolster 3 approximately 180 degrees by the motor 12, the air cylinder 8 raises the bolster 3. lower the key 24
into the key hole 25 of the rear bed 5. In this state, the second key 24 fitted into the key hole 25 of the bed 4 from below is integrally connected to the bolster 3 with the embedded bolt 23. That's one center line
Complete the positioning work for each mold 16 located at a symmetrical position on _A1 , and perform the above positioning work in the same way for the molds 16 located at symmetrical positions on other center lines _A2 , _A3 , and _A4 . .

Therefore, when the mold 16 selected by the operator during press processing is automatically supplied to the lower part of the slide 1 by raising → rotating → lowering the bolster 3 using the air cylinder 8 and the drive motor 12, the bolster 3
When lowering the bed, adjust the key 24 and the key hole 2 of each bed 4, 5 to check for a slight deviation in the stop position of the bolster 3.
In order to properly correct the misalignment by positioning by fitting with slide 1,
can be supplied while maintaining a constant positional relationship, and the subsequent work up to press processing, that is, crimping and fixing the bolster 3 to each bed 4 and 5 with the clamp 14, and setting the height of the slide 1 of the selected mold 16. Then, the slide 1 is lowered by an inch to the bottom dead center, the shank 19 of the punch part 20 is clamped with the hydraulic clamp 18, and the height of the slide 1 can be set to the machining height without any trouble, and the selected mold can be set. 16 can be started quickly.

"Effect of the invention" As is clear from the above embodiments, the present invention has an annular bolster 3 horizontally centered around the C-type press 2.
In a positioning mechanism of a mold changing device that rotates a plurality of molds 16 attached to the bolster 3 and sequentially supplies a plurality of molds 16 attached to the bolster 3 below the slide 1 of the press 2, the center lines A ₁ , A ₂ , A of the bolster 3 ₃ 、 _A4
The lower mold 17 of the mold 16 is placed on the upper surface of the symmetrical position centered on the center 0 point of the bolster 3, and the positioning key 24 is removably placed on the lower surface of the outer peripheral side of the symmetrical position.
A key hole 25 is provided in the bed 4, 5 that supports the bolster 3, and a key hole 25 is provided in the bed 4, 5 that supports the bolster 3 to fix the bolster 3 at the set position by fitting the positioning key 24. By properly fitting the positioning key 24 and key hole 25 at the set position of the bolster 3 through the up-and-down movement by the vertical movement and the rotational movement by the rotating member 12, the positioning key 24 and the fitting means 25 can be connected with the minimum clearance. It is possible to fit and fix each mold 16 with the slide 1 at all times, and to supply the molds 16 while maintaining a constant positional relationship with the slide 1. In addition, by separately positioning the two molds 16 at symmetrical positions of the bolster 3, the bolster Compared to a method in which all the molds 16 to be attached to the bolster 3 are positioned at the same time, there is no need to attach the molds 16 to the bolster 3 at equal intervals, and post-processing of the bolster 3 can be performed without using expensive machine tools. It is easy to apply to the bolster 3, and with high precision positioning,
This has remarkable effects such as the ability to accurately replace the mold 16 and achieve highly accurate uniformity of pressed products.

[Brief explanation of the drawing]

FIG. 1 is an explanatory plan view of a bolster section showing an embodiment of the present invention, FIG. 2 is an overall front view, FIG. 3 is a side view of the same, and FIG. 4 is an explanatory side view of the bolster section. 1... Slide, 2... C-type press, 3... Bolster, 24... Positioning key, 25... Key hole (fitting means).

Claims (1)

[Scope of utility model registration request] In a positioning mechanism of a mold changing device that rotates an annular bolster 3 horizontally around a C-type press 2 and sequentially supplies a plurality of molds 16 attached to the bolster 3 to a position below a slide 1 of the press 2. , center lines A ₁ , A ₂ of the bolster 3,
The lower mold 17 of the mold 16 is placed on the upper surface of the symmetrical position centered on the center 0 point of the bolster 3 on A ₃ and A ₄ ,
Further, positioning keys 24 are provided on the lower surface of the outer circumferential side at symmetrical positions so as to be removably fixed thereto, and key holes 25 are provided to fit the positioning keys 24 and fix the bolster 3 at the set position.
It is provided on the beds 4 and 5 that support the bolster 3, and the positioning keys 24 and the key holes 25 are appropriately fitted in the set position of the bolster 3 by the up and down movement of the lifting member 8 of the bolster 3 and the rotation movement of the rotating member 12. A positioning mechanism for a mold changing device, characterized in that it is configured to perform the following.