JPH0313932B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot bending mold for bending a semi-finished product roughly processed by forging into a complicated shape, and also performing finishing forming, that is, shaping. It is used for processing the front wheel nuts of automobiles.

(Conventional technology) When a workpiece has a formed part and a bent part,
Conventionally, forming and bending were performed in separate processes, but this required a large number of processes and was inefficient. Further, when processing using a mold without a movable mold, when the amount of bending is large, misalignment tends to occur and positioning is difficult.

(Problems to be Solved by the Invention) In order to overcome the drawbacks of the prior art, the present invention aims to provide a mold that allows easy and reliable positioning and allows for bending and finish forming in one stroke. be.

(Means for Solving the Problems) The present invention provides a vertical guide hole in a part of the lower mold body, is guided by the guide hole and moves up and down by a hydraulic cylinder, and has a lower mold forming surface on the upper surface. A movable mold with a molding surface forming a part of the mold and a positioning core are provided,
A guide hole is provided in the lower mold body and a movable stage fixed to the movable mold, and the balancer shaft is inserted through the guide hole, and when the movable mold is in the lowered position, the bending forming surface that extends laterally and continuous with the molding surface of the movable mold is connected to the lower mold body. The upper mold is provided with a molding surface and a bending surface corresponding to the molding surface of the lower mold including the molding surface and bending surface of the movable mold, and knockout pins are provided at the center and bending surface of the movable mold, respectively. The object is achieved by making it possible to hold a part of the workpiece between the molding surfaces of the movable mold and the upper mold when the movable mold is in the raised position.

(Example) The drawings show an example in which the workpiece is a knuckle for a front wheel of an automobile. Before being processed by the mold of the present invention, the knuckle 1 consists of a knuckle arm 3 having parts from A to D from the center boss 2, a tie rod arm 4, a king pin boss 5, and a caliper as shown in FIGS. 4 and 5 a. It is a forged product with extended brackets 6, 6, etc., and the king pin boss 5 is pre-formed bent at right angles, and the tip of the knuckle arm 3 is pre-formed at the 2 part to facilitate bending. It has been subjected to a bending process. In order to reduce weight, a groove 7 is formed from above and below in the part of the nutcle arm 3 near the boss, and this part has an H-shaped cross section.
Recesses 8 and 9 are formed at the top and bottom of the center boss 2. In the embodiment, the knuckle 1 is bent into a predetermined curved shape at the knuckle arm 3 part, and the entire knuckle 1 is shaped, but the present invention is not limited to only the knuckle processing. It is applicable to similar articles with complex curved surfaces.

In FIG. 1, reference numeral 10 denotes a bolster, to which a lower mold body 13 is fixed by a lower base plate 11 and a mold holder 12, and a ram 14 has an upper base plate 1.
5. The upper mold body 17 is fixed by the mold holder 16. Knockout pins 18 and 19 of the lower die 4 are fixed to the knockout plate 20 and are moved up and down by the extrusion rod 21. Reference numeral 22 denotes a T-shaped head fixed to the top of the knockout pin 18, and covers the sliding portion of the pin 18 to prevent scale powder from entering the sliding portion. 2
3, 24, 25 are knockout pins of the upper die 17, the knockout plate 26, and the extrusion rod 2.
7.

The lower mold body 13 has a guide hole 30 for the movable mold 33 and four balancer guide holes 31 surrounding the guide hole.
is drilled, and the lower part of both guide holes 30, 31 is a step part 3.
2 is hollowed out to form a cavity 32a in which the movable plate 34 can move up and down. Mobile type 33
is slidably inserted into the guide hole 30, and its lower end is fixed to the movable table 34 with a bolt 35, and further,
A positioning core 37 is slidably inserted into a center hole 36 of a movable mold 33.

Movable guide hole 30 of lower mold main body 13, movable mold 33
The curved surface formed by the upper surface 38, the side surface 39 of the positioning core 37, and the surface of the head 22 of the knockout pin 18 becomes a molding surface that comes into contact with the lower surface (outer surface) of the center boss 2 of the knuckle 1. .

An arm stand 40 is fixed to the upper surface of the lower mold body 13, and a bending surface is formed on the upper surface. The bending surface consists of a groove 41 into which the lower half of the knuckle arm 3 is inserted, a rib 42 which fits into the groove 7 on the lower side of the knuckle arm 3, and a vertical surface extending downward from the outer end of the groove 41. On the lower surface of the upper die main body 17 facing this, there is a groove 4 into which the upper half of the knuckle arm 3 is inserted.
3 and a rib 44 that fits into the upper groove 7 is formed. Further, a bending cam 45 is provided opposite the outer end of the groove 43.
is fixed to the lower surface of the upper body 17, and the cam 45 is formed with an inclined surface 46 and a vertical surface 47. on the other hand,
The portion facing the movable die 33 includes a convex portion 48 that receives the upper surface of the boss 2 and a concave portion 4 that receives the king pin boss 5.
9 is formed.

The large diameter portion 51 of the slide balancer shaft 50 is slidably inserted into the four balancer guide holes 31, and the small diameter portion 52 is inserted into the moving base 33 as shown in FIG.
The movable mold 33 and the movable table 34 are prevented from tilting during work. Further, a spring 54 is interposed between the movable table 34 and the large diameter portion 51, and the slide balancer 50 is projected a certain distance from the upper surface of the lower die main body 13 to reduce the impact when the upper die is lowered. The spring 54 is a coil spring, but a disc spring is advantageous for models that are subject to large impacts. The small diameter portion 52 of each balancer shaft 50 is extended downward beyond the lower surface of the movable table 34, and a head portion having a larger diameter than the guide hole 53 is provided to prevent it from coming off.
It is advantageous if the distance by which the large-diameter portion projects upward is regulated because the timings at which buffering and slide guidance by the balancer shaft 50 start coincide completely.

As shown in FIG. 3, the upper molding surface of the lower mold is formed by the lower mold main body 13, the movable mold 33, and the arm stand 40, on which the knuckle 1 is placed. In the figure, 4', 6', and 6' indicate unused receiving grooves for the tie rod arm and caliper bracket carved in the movable mold 33 and the lower mold body 13, and these receiving grooves 4', 6', and 6'' is used when machining a symmetrical knuckle for use on a wheel on the opposite side of the knuckle 1 shown.

In order to move the movable mold 33 up and down, three hydraulic cylinders 55 are arranged at approximately equal intervals as shown in FIG. 3, and a piston shaft 56 is fixed to the movable table 34 with a pin 57.

The movable table 34 is seated on a movable table base 58 integrated with the lower die main body 17 at the lower end position.

(Function) The movable table 34 is raised to the stepped portion 32 by pressurizing the hydraulic cylinder 55, and the movable mold 33 is projected from the lower mold body 13 together with the positioning core 37.
The knuckle 1 heated to ℃ is shown in Figures 3 and 5 a.
Place the center boss 2 as shown in FIG. 8, the boss 2 is clamped and held by the upper and lower molds, and the upper mold body 1 is inserted into the upper mold body 1.
7. When the movable mold 33 and the core 37 are lowered, the knuckle arm 3, which is supported by the top of the arm stand 40, begins to bend upward at the d' portion as shown in FIG. Bending cam 45 as shown in c.
Pushed by the slope 46 of , it bends from A to C,
Next, as shown in FIG.
The middle part of the knuckle arm 3 deepens its engagement with the groove 43 of the upper die and the upper and lower ribs 42, 44 until it reaches the position d in the figure, and the bending and shaping are completed. During this time, the unevenness and irregular shape on the entire surface of the knuckle 1 are pressed against the molding surfaces of the upper and lower molds to smooth and correct them, and the knuckle 1 is finished molded into the desired shape.

(Effects of the invention) Since a part of the workpiece is first held between the movable mold and the upper mold, the workpiece can be held securely without shifting its position, and even if the amount of bending is large, it can be bent in one stroke. At the same time, finish forming processing, that is, shaping processing can be performed.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the hot bending mold of the present invention;
Figure 2 is a partial sectional view of the slide balancer section, Figure 3 is a partial cross-sectional view of the slide balancer section;
The figure is a plan view of the lower mold, FIG. 4 is a plan view of the knuckle as a workpiece, and FIGS. 5 a, b, c, d, and e are explanatory diagrams of the processing order. 13...Lower mold main body, 17...Upper mold main body, 18,
19, 23, 24, 25... Knockout pin,
30... Guide hole, 31, 53... Balancer shaft guide hole, 33... Mobile type, 34... Moving table, 37...
Positioning core, 40...arm stand, 50...balancer shaft, 55...hydraulic cylinder.

Claims (1)

[Claims] 1 A vertical guide hole is provided in a part of the lower mold body, and the mold is guided by the guide hole and moved up and down by a hydraulic cylinder.
In addition, a movable mold with a molding surface forming a part of the lower mold molding surface on the upper surface and a positioning core are provided, and a guide hole is provided in the lower mold main body and a movable table fixed to the movable mold, and the balancer shaft is inserted through the movable mold. , the lower mold body is provided with a bending surface that extends laterally in succession with the molding surface of the movable mold in the lowered position of the movable mold, and the upper mold has a bending surface that includes the molding surface of the movable mold and the bending surface of the lower mold. A molding surface and a bending surface are provided corresponding to the molding surface, and knockout pins are provided at the center and bending surface of the movable mold, respectively, and when the movable mold is in the raised position, the molding surfaces of the movable mold and the upper mold are used to form a workpiece. A hot bending mold characterized in that a part of the mold can be clamped.