CN104139170B - A clamping device for direct extrusion casting mold - Google Patents

Abstract

The invention discloses a clamping device for a direct extrusion casting mold, which comprises an upper mold clamping ring sleeved outside the right mold and a lower mold clamping ring sleeved outside the left mold, the upper mold clamping ring The angle of the inner surface of the ring of the lower clamping ring is consistent with that of the tapered surface of the left mold and the right mold, so that the molds can cooperate with each other when they are molded, forming a self-locking angle. When the mold is pre-closed, the lower clamping ring moves to the lower clamping position of the side mold under the drive of the lower clamping ring drive cylinder to lock itself, and the upper clamping ring moves to the upper clamping position of the side mold to lock itself under the drive of the upper template ; After the upper and lower clamping rings reach the closing position, lock the side mold, and form a closed cavity together with the side mold, upper mold and lower mold to realize mold closing and filling. After the filling is completed, the upper mold presses down, and the connecting screw on the upper mold clamping ring returns to the hole of the upper mold plate, so that the upper mold clamping ring and the upper mold are separated in motion, and the upper and lower mold clamping rings jointly provide the extrusion process. clamping force.

Description

A clamping device for direct extrusion casting mold

technical field

The invention relates to the field of squeeze casting, in particular to a clamping device for a direct squeeze casting mold.

Background technique

Squeeze casting refers to forming and crystallizing and solidifying the liquid or semi-solid metal poured into the mold cavity under high mechanical pressure, so as to obtain high-quality parts with fine grains, dense internal structure and high surface finish. A forming method. At present, squeeze casting products both at home and abroad have a tendency to be large-scale, complex and lightweight.

Due to the characteristics of large volume, complex shape structure, uneven wall thickness, and local forming difficulties, large and complex parts have the following characteristics and requirements when they are produced by direct extrusion casting forming process:

(1) For the direct squeeze casting forming process of large and complex parts, in order to obtain a shaped casting with excellent comprehensive performance, it is necessary to use a large mechanical pressure to obtain an ideal squeeze casting structure during the forming process, and usually squeeze casting is used It is difficult for the press to meet the clamping force requirements for direct extrusion casting of large and complex parts. Therefore, the mold structure is required to provide additional large clamping force.

(2) For the direct extrusion casting process of large and complex parts, the volume of molten metal required for filling the casting is very large. In order to ensure the quality of the molten metal and avoid serious oxidation and gas absorption of the molten metal, In the process of conveying and filling the molten metal, the contact between the molten metal and the air and the residence time in the barrel should be reduced as much as possible. Therefore, it is required that the designed mold structure has the function of pre-molding and can realize mold closing and filling.

(3) For the direct extrusion casting process of large and complex parts, due to the large volume of molten metal required for filling the mold, the required filling time is long, and the heat loss of the molten metal during the filling process is large Therefore, in order to reduce the impact of the outer hard shell of the molten metal on the extrusion pressure after the filling is completed, it is also necessary to require the mold to have the ability to quickly establish a higher extrusion force in the molten metal in the cavity.

Chinese patent 201210396426.4 uses a floating direct extrusion casting mold to realize the direct extrusion casting forming production of large aluminum alloy wheels. Extrusion of molten metal in the mold cavity, but the moving coil structure of the mold has strict requirements on the shape of extrusion castings, and is not suitable for parts with complex shape structures; Chinese patent 200510035694. Interlocking and releasing the interlocking of molds, so as to increase the clamping force of the mold and realize the mold closing and pouring process, but when realizing the closing and pouring, the interlocked molds need to be raised and lowered as a whole, and the molten metal will be in contact with the air for a long time , affecting the quality of molten metal, and its action process is more complicated, which requires higher mold manufacturing; Chinese utility model patent 93203245.1 realizes the extrusion of aluminum alloy wheels by designing molds with multiple diagonal tie rod mechanisms on vertical extrusion casting equipment Die casting production, the inclined tie rod designed in the mold is mainly used for mold clamping, mold opening and material ejection, but this device cannot increase the clamping force during squeeze casting production, nor can it realize mold closing and pouring.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a clamping device for direct extrusion casting molds, so as to meet the requirements of large mold clamping force and clamping force in the process of direct extrusion casting of large and complex parts. Type and rapid establishment of large extrusion force requirements.

The present invention realizes through following technical scheme:

A clamping device for a direct extrusion casting mold, comprising a left mold 23, a right mold 7, a press worktable 19, and an upper mold plate 26; The upper mold clamping ring 6 and a lower mold clamping ring 10 sleeved on the outside of the right mold 7 and the left mold 23, the inner surface of the upper mold clamping ring 6 and the lower mold clamping ring 10 are in contact with the left mold 23 It is consistent with the angle of the tapered surface at the fitting position of the right mold 7, so that the molds can cooperate with each other when fitting to form a self-locking angle.

The clamping device also includes a right drive cylinder 12 and a left drive cylinder 18 for driving the lower clamping ring 10 to move;

The right drive cylinder 12 and the left drive cylinder 18 are symmetrically distributed and fixedly installed on the press worktable 19,

The lower clamping ring 10 is fixedly connected with the right driving cylinder 12 and the left driving cylinder 18;

The upper clamping ring 6 is flexibly connected to the upper template 26 through a plurality of evenly distributed connecting pieces.

The connector includes a connecting screw 3, a screw sleeve 4 and a spring 25; the screw sleeve 4 is fixedly connected to the upper clamping ring 6 through the connecting screw 3, and the two ends of the spring 25 are respectively fixedly connected to the upper clamping ring 6 and the upper template 26 superior.

On the upper template 26 and the upper connecting plate 2, there are holes for connecting the screw rod 3 and the screw rod sleeve 4 to realize the retreating action respectively.

Compared with the prior art, the present invention has the following advantages and effects:

(1) The clamping device of the present invention has a reliable structure, simple clamping and unlocking actions, and does not require additional complicated auxiliary control mechanisms. It is especially suitable for molds that use vertical or composite molds, and can meet the direct extrusion of large and complex parts. The requirement of large specific pressure and large clamping force for casting forming.

(2) The upper mold clamping ring and the lower mold clamping ring in the mold clamping device act independently, the lower mold clamping ring moves up and down through two independent hydraulic cylinders, and the upper mold clamping ring moves under the drive of the main hydraulic cylinder of the press, The movement of the upper and lower clamping rings does not require synchronous control, and its movement control is simple, avoiding the design of complicated oil circuits.

(3) The angle of the tapered surface of the inner surface of the clamping ring of the clamping device is the self-locking angle formed by the matching surfaces of the upper and lower clamping rings and the left and right molds. For different mold materials and different contact surfaces In the case of the coefficient of static friction, it is only necessary to change the angle of the tapered surface of the inner surface of the clamping ring and the angle of the tapered surface of the clamping position of the side mold according to the self-locking angle during design, so that the mold clamping device can automatically Lock, the applicability of the clamping device is strong.

(4) During the mold pre-closing process, the upper and lower clamping rings move to the side mold clamping position to provide clamping force, and form a closed cavity together with the left and right molds, upper and lower clamping rings, When pouring, the molten metal is directly input into the barrel through the quantitative conveying system through the hole on the side wall of the barrel, and then the lower punch moves upward to squeeze the molten metal into the closed cavity of the mold to realize the closed mold casting of the mold.

(5) Since the upper clamping ring and the upper template are connected by connecting screws, screw sleeves and springs, during the extrusion process, the upper clamping ring and the mold connecting frame, upper connecting plate, upper template and upper mold Movement separation can be realized. Therefore, the upper clamping ring does not affect the pressurization action of the upper mold. After the mold filling is completed, the upper mold can quickly form a large extrusion force in the molten metal in the mold cavity, thereby ensuring the quality of the formed casting.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the top view of upper clamping ring 6;

Fig. 3 is a schematic cross-sectional structure diagram of the upper clamping ring 6;

FIG. 4 is a schematic cross-sectional structure diagram of the lower clamping ring 10 .

detailed description

The present invention will be described in further detail below in conjunction with specific embodiments.

Example

As shown in Figure 1--3. The clamping device of the direct squeeze casting mold of the present invention comprises a left side mold 23, a right side mold 7, a press worktable 19, and an upper mold plate 26; The upper mold clamping ring 6 and a lower mold clamping ring 10 sleeved on the outside of the right mold 7 and the left mold 23, the inner surface of the upper mold clamping ring 6 and the lower mold clamping ring 10 are in contact with the left mold 23 It is consistent with the angle of the tapered surface at the fitting position of the right mold 7, so that the molds can cooperate with each other when fitting to form a self-locking angle.

The clamping device also includes a right drive cylinder 12 and a left drive cylinder 18 for driving the lower clamping ring 10 to move;

The right drive cylinder 12 and the left drive cylinder 18 are symmetrically distributed and fixedly installed on the press worktable 19,

The lower clamping ring 10 is fixedly connected with the right driving cylinder 12 and the left driving cylinder 18;

The upper clamping ring 6 is flexibly connected to the upper mold plate 26 through a plurality of (six) evenly distributed connecting pieces.

The connector includes a connecting screw 3, a screw sleeve 4 and a spring 25; the screw sleeve 4 is fixedly connected to the upper clamping ring 6 through the connecting screw 3, and the two ends of the spring 25 are respectively fixedly connected to the upper clamping ring 6 and the upper template 26 superior.

On the upper template 26 and the upper connecting plate 2, there are holes for connecting the screw rod 3 and the screw rod sleeve 4 to realize the retreating action respectively.

The lower mold 20 is fixed on the press worktable 19 through bolt connection, and the left mold 23 and the right mold 7 are positioned on the lower mold 20, and are respectively connected to the left mold shield 22 by the left mold shield 22 and the right mold shield 8. The mold driving mechanism 21 and the right mold driving mechanism 9 are connected, and the lower mold 20 is provided with a side mold guide block, which can play the role of guiding and positioning when the left mold 23 and the right mold 7 are closed; The splitter mechanism 11 is fixedly connected to the lower mold 20; the upper mold 27 is fixedly connected to the upper template 26 through bolts.

The main action process of the clamping device is as follows:

(1) The action sequence of the clamping device when the mold is pre-closed is as follows: first, the mold center rod 24 is fixed on the lower mold through the positioning and diverting mechanism 11 on the lower mold 20, and the left mold 23 and the right mold 7 are respectively on the left The mold driving mechanism 21 and the right mold driving mechanism 9 are driven to close; after the left mold 23 and the right mold 7 are closed, the lower clamping ring 10 is driven by the left drive cylinder 18 of the lower clamping ring and the lower clamping ring The right driving cylinder 12 of the right driving cylinder 12 is synchronously driven to move upward to the lower end of the closed side mold and self-locks. The left driving cylinder 18 of the lower clamping ring 10 and the right driving cylinder 12 of the lower clamping ring 10 maintain pressure to ensure The lower clamping ring 10 is in the clamping position; then the main hydraulic cylinder of the press drives the mold connecting frame 1, the upper connecting plate 2, the upper mold plate 26 and the upper mold 27 to move downward to close the mold, and the upper mold plate 26 drives the upper mold clamping ring in 6 directions. Move down until the upper end of the closed side mold is self-locked, and the mold is pre-closed before filling.

(2) When the mold is closed and filled, since the upper clamping ring 6 and the lower clamping ring 10 have reached the clamping position after the mold is pre-closed, it can be provided by the upper clamping ring 6 and the lower clamping ring 10. The clamping force required for mold closing and filling.

(3) After the mold clamping and filling are completed, the mold connecting frame 1, the upper connecting plate 2, the upper template 26 and the upper mold 27 continue to move downward and pressurize under the drive of the main hydraulic cylinder of the press. The connecting screw 3 and the screw sleeve 4 of the ring 6 and the upper template 26 are returned to the holes of the upper template 26 and the upper connecting plate 2 to realize the movement separation of the upper clamping ring 6 and the upper mold 27 during extrusion, so as to ensure that the upper mold 27 A large extrusion force can be quickly established in the molten metal in the mold cavity.

(4) After the formed casting is pressure-preserved and solidified, the action sequence of the clamping device when the mold is opened and taken out is as follows: the main hydraulic cylinder of the press releases the pressure to drive the mold connecting frame 1, the upper connecting plate 2, the upper template 26 and the upper mold 27 moves upward, when the upper template 26 moves to the mold pre-fitting position, the connecting screw 3 and the screw sleeve 4 are tightened, driving the upper clamping ring 6 to separate from the left mold 23 and the right mold 7; at the same time, the lower mold clamps The ring left drive cylinder 18 and the lower clamping ring right drive cylinder 12 release pressure and retreat, driving the lower clamping ring 10 to separate from the left mold 23 and the right mold 7, thereby releasing the mold clamping effect of the clamping ring on the mold; then The left side mold driving cylinder 21 and the right side mold driving cylinder 9 are depressurized and retracted, so that the left side mold 23 and the right side mold 7 are separated, and finally the casting is taken out.

As described above, the present invention can be preferably carried out.

The implementation of the present invention is not limited by the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods, and are all included in within the protection scope of the present invention.

Claims (3)

1. A clamping device for a direct squeeze casting mould, comprising a left side mold, a right side mold, a press worktable, and an upper mold plate, and is characterized in that it also includes a mold that is sleeved on the outside of the right side mold and the left side mold An upper mold clamping ring and a lower mold clamping ring sleeved outside the right mold and the left mold, the ring inner surfaces of the upper mold clamping ring and the lower mold clamping ring are in contact with the mold fitting positions of the left mold and the right mold The angles of the tapered surfaces are consistent, so that the molds can cooperate with each other to form a self-locking angle; The clamping device also includes a right drive cylinder and a left drive cylinder for driving the movement of the lower clamping ring; The right drive cylinder and the left drive cylinder are symmetrically distributed and fixedly installed on the working table of the press, The lower clamping ring is fixedly connected with the right drive cylinder and the left drive cylinder; The upper clamping ring realizes the flexible connection with the upper formwork through multiple evenly distributed connectors; The connecting piece includes a connecting screw, a screw sleeve and a spring; the screw sleeve is fixedly connected to the upper clamping ring through the connecting screw, and the two ends of the spring are respectively fixedly connected to the upper clamping ring and the upper template. 2. The mold clamping device of the direct squeeze casting mold according to claim 1, wherein the mold clamping device also includes an upper connecting plate arranged on the upper part of the upper template, and the upper template and the upper connecting plate are respectively There are holes for connecting the screw rod and the screw sleeve to realize the retraction action. 3. The mold clamping device for direct extrusion casting mold according to claim 2, characterized in that, the self-locking angle is 6°.