JPH0732128A - Method and device for automatic trimming - Google Patents

Abstract

PURPOSE:To save a labor cost by unmanned operation and labor saving, to save a manufacturing cost and equipment cost by the omission of secondary work and to rationalize the work by performing in a cycle fitting into a casting cycle to a hollow shaped product in the cutting part shape without affecting the material and the thickness at the cutting part at the time of trimming a die casting product. CONSTITUTION:Two pieces of mutually facing edges 6, 7 are arranged to execute the trimming of the die casting product and the edges 6, 7 are used so as to cut to depth of almost 1/3-1/4 of the outer diameter of the hollow shaft toward the cutting off part at the same time. Successively, the edge 7 is retreated to the original position and at the same time, the edge 6 is used so as to cut to further deeper to the advancing direction. Then the edge 6 is retreated to the original position and following to this, this edge 6 is again advanced toward the edge 7 cutting part so as to separate the product and the unnecessary part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a die cast product in which an unnecessary portion such as a runner communicates with a hollow shape, and a so-called trimming operation for cutting and removing the unnecessary portion from the product is performed. A method and a device for performing automatically.

[0002]

2. Description of the Related Art In a die-cast product, the unnecessary part such as the product and the runner has a hollow cross-sectional shape, and the conventional trimming work for the product is the communication between the product and the runner. A saw cutting method or the like is adopted for the portion. This is because in the shearing method in which a shearing force is applied from one side to push the product, the cut surface causes a so-called "chip" phenomenon on the product side, which damages the product.

[0003]

As described above, in the case of a die cast product with a hollow cross section, the cross section of the cut due to shearing force becomes a shear fracture surface, causing "chips" in the product, and Since the damage rate is increased, the yield is decreased, and the shearing method cannot be trimmed. Generally, the shape of the cutting edge due to shearing force is influenced by various factors such as the knife gap of the shearing machine, the material of the material to be sheared, the material and shape of the blade, or the temperature and shear rate of the material, Sag occurs, and burrs etc. occur on the sheared surface and shear fracture surface. in this case,
If the material of the product is ductile, most of the cut end has a sheared surface, and sagging and burrs are large. On the other hand, when the material of the product is a brittle material, the sag and shear surface area are small and most of the cut end has a shear fracture surface, which is also an irregular shape. In particular, the harder the aluminum die-cast alloy is, the higher the silicon content, the more the shear fracture surface will "chip" irregularly on the product side, making it impossible to perform trimming only by shearing. Is. Therefore, at present, the product is completed by cutting with the saw blade method. Therefore, the time and labor required for this secondary processing increase, and the process does not match the flow of the casting cycle, which disturbs the flow speed of the manufacturing line. In addition, the equipment cost for secondary processing increases,
It is extremely inefficient work.

As described above, with respect to the trimming of the hollow shape in the die-casting product, the labor of the secondary machining is reduced as much as possible, and the whole process including the trimming is matched with the cycle of the primary machining so that the highly efficient flow work can be performed. At present, the development of a method and a device that can be performed is awaited.

The present invention has been made in view of the above-mentioned prior art, and it is possible to perform a trimming operation of a cross section having a hollow shape in a die cast product without being affected by the material of the product or the wall thickness of the cut portion. By making it possible to carry out the work within a cycle that is within the cycle, labor cost can be reduced due to unmanned work or labor saving, and the work cost and equipment cost can be reduced by omitting the secondary processing, thereby improving work automation and efficiency. It is an object of the present invention to provide an automatic trimming method and device that can realize the above.

[0006]

In order to achieve the above object, the automatic trimming method of the present invention is a die cast product having a hollow cross-section, and a cutting portion for cutting an unnecessary portion. Two blades (6), (7) facing each other for advancing from both sides and for cutting and trimming are provided.
Each of the operations is performed according to the series of steps shown below. That is, the blades (6) and (7) are cut almost at the same time toward the cutting portion. The blade (7) is retracted to the position before cutting. The blade (6) is further cut in the forward direction. The blade (6) is retracted to the initial position before cutting. By cutting the blade (7) again toward the cut portion, the cut portion having a hollow cross-sectional shape of the die cast product is cut into two parts, a product and an unnecessary portion. The blade (7) is retracted to the initial position before cutting.

Further, according to the automatic trimming device of the present invention, as described in claim 2, in order to cut the unnecessary portion by advancing from both sides toward the cutting portion of the casting product sandwiched on both sides and cutting. , Two blades (6) and (7) provided facing each other, and said blades (6) and (7)
On the other hand, it is provided with a cylinder for individually moving forward and backward and a control device for automatically controlling the operation of each cylinder according to a program.

Further, in the automatic trimming device of the present invention, as set forth in claim 3, a plurality of cylinders for each of the blades (6) or (7) are provided and arranged in a skewer shape, and the blades ( It is also possible to divide the multiple stages of strokes required in 6) or (7) by individual cylinders.

[0009]

In order to automatically perform the trimming of the die cast product by the trimming device of the present invention, as shown in claims 1 and 2, the blades (6) and (7) provided in the device are almost simultaneously and at any time. Also, in the forward direction, a cut is made from both sides toward the cut portion of the cast product. The cutting depth of the blade at that time is about 1/3 to 1/4. Next, the blade (7) is retracted toward the position before cutting. After that, the blade (6) is further cut in the forward direction, and then the blade (6) is retracted to the initial position before cutting. Further, by re-cutting the blade (7) toward the cut portion, the hollow cut portion of the die cast product is cut into two parts, a product and an unnecessary part, and separated. The cut surface separated by cutting is formed into a wedge-shaped concave portion, which is first cut by the blade (6) in cooperation with the blade (7), and is formed on the side of the blade (6) on the opposite surface, thereby forming a squareness. Is retained and an excellent smooth surface is obtained. Then the blade (7) is retracted towards its initial position before cutting. All of the above operations are automatically performed based on a computer program or the like. Further, the automatic trimming device of the present invention has a plurality of cylinders for each of the blades (6) or (7) and arranges them in a skewered form as described in claim 3, and the blades (6) or the blades are arranged. By constructing each of the plurality of strokes required in (7) so as to be shared by each individual cylinder, the strokes can be directly performed, and the program of the control device can be easily and easily assembled.

[0010]

Embodiments of the present invention will be described with reference to the drawings. 1 to 3, a rectangular fixed plate 1 located at the top,
The rectangular fixed plate 4 located at the bottom facing this is 4
It is firmly assembled by the book tie bars 2, 2, ... A movable platen 3 is interposed between the fixed platen 1 and the fixed platen 4. The movable platen 3 is moved up and down by a pressurizing cylinder 5 provided on the top part using the diver 2 as a guide. On the lower surface of the movable platen 3 that faces the upper surface of the fixed platen 4, a die body 6-1 and a blade (6) and a primary pressure cylinder 6-2 coaxially connected to the blade (6). And the secondary pressure cylinder 6-3, which is also coaxially connected, are mounted in a skewer shape.
The blade (6) is expanded and contracted in two stages by the primary pressure cylinder 6-2 and the secondary pressure cylinder 6-3 using the mold body 6-1 as a guide. The stationary platen 4 is also coaxially connected to the die body 7-1, the blade (7) and the primary pressurizing cylinder 7-2 coaxially connected to the blade (7) on the upper surface, and to the same type 2
The next pressurizing cylinder 7-3 is attached in a skewer shape.

Actuation of the pressure cylinder 5 for the movable plate 3, the pressure cylinders 6-2, 6-3 for the blade (6) and the pressure cylinders 7-2, 7-3 for the blade (7), respectively. For automatic control according to a preset program,
A control device 8 is provided.

The operation mode of the automatic trimming apparatus having the above-described structure will be described. In FIG. 1, the movable platen 3 is raised to the uppermost position by the pressurizing cylinder 5, and die casting is performed on the die body 7-1. The open height when the item is placed is S1. In this state, when the control device 8 causes the pressurizing cylinder 5 to descend, the mold body 6-1 descends together with the movable platen 3, and the lower mold body 7-1 and the upper mold body 6-1. The die cast product is sandwiched by both sides. The state is shown in FIG. FIG. 3 is an enlarged view of the main part of this state.

FIG. 4 shows that the cut portion of the die cast product is
It shows the shape of a cutting blade that cuts it in a hollow shape. Curvature R, R'of this cutting edge and cutting edge tip width t, t '
The shear angles θ and θ'are properly determined depending on the material of the product to be cut, the wall thickness, the uneven thickness difference, the trimming temperature, and the like.

FIG. 6 shows the process from the state of FIG. 3 until the unnecessary portion is cut and separated, and is shown in (a) to (e). The blade (6) is moved to 1 by the transition from the figure (a) to the figure (b).
The extension of the next pressurizing cylinder 6-2 makes a S2 stroke, and the blade (7) makes a S3 stroke at the same time as the extension of the primary pressurizing cylinder 7-2 makes a cut on both sides of the cast product. The depth of the cut is approximately 1/3 to 1/4 of the outer diameter of the cut portion. Next, the blade (7) is retracted by the contraction of the primary pressure cylinder 7-2 to the initial position shown in (a) of the figure by the transition from (b) to (c) of the same figure. At the same time, the blade (6) makes an S4 stroke by the extension of the secondary pressure cylinder 6-3. After that, the blade (6) is contracted by the primary pressurizing cylinder 6-2 and the secondary pressurizing cylinder 6-3 by the transition of FIG. It is retracted to the initial position shown in a). At the same time, the blade (7)
Strokes S3 + S5 are caused by the extension of the primary pressure cylinder 7-2 and the secondary pressure cylinder 7-3, whereby the die cast product having a hollow cross-sectional shape is cut into two parts, a product P and an unnecessary part Q. It After the cutting is completed, the blade (7) is moved to the primary pressure cylinder 7-2 and the secondary pressure cylinder 7
By each contraction of -3, it is retracted to the initial position shown in FIG. And after cutting, the blade (6)
FIG. 11A shows the blade and the blade (7) kept in the initial position.

The hollow cross-sectional shape of the die-cast product is shown with diagonal lines showing the hollow cross-sectional state before cutting, and those without diagonal lines are already cut with the blade (6) or the blade (7). Shows the state. In this way, cuts are made from both sides of the cast product. The depth of the cut is approximately 1/3 to 1/4 of the outer diameter of the hollow cross section. By this process, the product P and the unnecessary product Q are connected with each other with a slight gap. It goes without saying that the depth of the cut at this time is set to an optimum amount depending on the material and shape of the product. After the product P and the unnecessary product Q are cut into two parts, the movable platen 3 moves to the blade (6) type body 6
-1, together with the primary pressurizing cylinder 6-2 and the secondary pressurizing cylinder 6-3, the pressurizing cylinder 5 is actuated to the uppermost old position to ensure the open height S1. The operation of each cylinder described above is automatically controlled by a computer program stored in the control device 8.

In the above-mentioned process, when the die-casting product is trimmed in a portion having a hollow cross section, the blade (6) and the blade (7) are cut from both sides of the cut portion in the first step.
By the horizontal axis direction, a wedge-shaped recess is carved [(b) in FIG. 4], and in the vertical direction, the cutting edge has a width t of the blade (6) and a cutting edge of the cutting edge (7). A width t is carved, and the inner wall side and the outer wall side of the hollow section are cut substantially at the same time by the extension of the primary pressure cylinder 6-2 of the blade (6) and the primary pressure cylinder 7-2 of the blade (7). 4 (a)], the blade (6) and the blade are alternately shaving, which is the cutting of the residual meat from the upper part by the blade (6) and the cutting of the residual meat from the lower part by the blade (7). (7) It is effective in guiding the cutting surfaces by cutting with the primary pressurizing cylinders 6-2 and 7-2, respectively, on a straight line in the perpendicular direction, and as a result, the shape of the cut cutting surfaces is As illustrated in FIGS. 5A and 5B, it is possible to form a smooth cut surface that does not require secondary processing.

The pressure fluid used in each cylinder of the automatic trimming device according to the present invention is air or oil. In the above-mentioned embodiment, the number of cylinders for operating the blade is two for the blade (6) and two for the blade (7), but the number of cylinders is not limited to this. There is no need to change the arrangement or number depending on the material or shape of the product, and moreover, the curvature R of the cutting edge of the blade (6), the blade width t, the shear angle θ and the curvature R of the cutting edge of the blade (7). It is needless to say that ′, the blade width t ′, and the shear angle θ ′ are set to the optimum amounts, and that the trimming operation direction is not limited to the vertical direction, and the horizontal operation may be performed.

[0018]

Since the automatic trimming method and apparatus of the present invention are configured as described above, they have the following effects.

According to the structure of claims 1 and 2, in order to assist the cutting process of the blade (7), which performs the cutting separation of the final process of the pair of blades (6) and (7) provided facing each other. , The blade (6) by means of the secondary pressure cylinder, first by the cutting cut formed on the opposite side by the blade (6),
The shaving cutting process of (7) is guided in a straight line, and the shape of the cut surface separated by cutting can be an excellent smooth surface with no "chips". Therefore, it is not necessary to add a surplus for secondary processing around the finished size of the product.
The labor cost for the next processing and the equipment cost for the processing machine can be omitted, and the time for the secondary processing is not necessary. Therefore, the trimming operation of the die cast product can be performed by using the material of the product and the cut part of the hollow shape. It became possible to carry out the work as a flow work under the cycle that fits within the casting cycle without being affected by the wall thickness, and automation of work and high efficiency could be realized.

As described in claim 3, a plurality of cylinders for the blade (6) or the blade (7) are provided, the cylinders are arranged in a skewer, and the plurality of steps required for each blade are individually processed. It is possible to freely and directly set the numerical values related to the stroke length and pressure required for each stroke by configuring it to be shared by the shilling of the control device, which simplifies the assembly of the control device program. It will be easy.

[Brief description of drawings]

FIG. 1 is a sectional view of the device of the present invention.

FIG. 2 is a cross-sectional view of an operation mode different from FIG.

3 is an enlarged cross-sectional view of a main part of FIG.

4A is a front view of a blade for cutting a die-cast product having a hollow cross-sectional shape, and FIG. 4B is a side view thereof.

5A is a cross-sectional view of a die cast product having a hollow cross-sectional shape, and FIG. 5B is a plan view thereof.

6 (a), (b), (c), (d) and (e) are:
It is explanatory drawing which shows the operation mode from which all differ.

[Explanation of symbols] 1 fixed plate 2 tie bar 3 movable plate 4 fixed plate 5 pressurizing cylinder 6,7 blade 6-1,7-1 type main body 6-2,7-2 primary pressurizing cylinder 6-3,7 -3 Secondary pressure cylinder 8 Control device

Claims (4)

[Claims] 1. When the product part of the die cast product and the unnecessary part communicate with each other in a hollow cross section, in order to cut this part, it is advanced from both sides toward the cut part and cut. In order to perform trimming, two blades (6) and (7) facing each other are provided, and the operation of each of these two blades (6) and (7) is performed in accordance with a series of steps described below. An automatic trimming method characterized by being exposed. The blades (6) and (7) are cut almost simultaneously, both towards the cut. The blade (7) is retracted to the position before cutting. The blade (6) is further cut in the forward direction. The blade (6) is retracted to the initial position before cutting. By cutting the blade (7) again toward the cut portion, the cut portion having a hollow cross-sectional shape of the die cast product is cut into two parts, a product and an unnecessary portion. The blade (7) is retracted to the initial position before cutting. 2. A device for cutting a cut portion having a hollow cross-section in a die-cast product, which comprises two blades provided facing each other for cutting from both sides and cutting the cut portion. 6) and (7), a cylinder for individually moving forward and backward with respect to each of the blades (6) and (7), and the operation of each cylinder according to a program,
An automatic trimming device having a control device for automatic control. 3. A plurality of cylinders for each of the blades (6) or (7) are provided and arranged in a skewer shape, and a plurality of steps required for the blades (6) or (7) are provided. 3. The automatic trimming device according to claim 2, wherein the individual cylinders share the work. 4. The automatic trimming according to claim 1, 2 or 3, wherein the shape of the cutting blade is configured to have a curvature, a tip width and a shear angle which are optimum for cutting a cut portion having a hollow cross section. apparatus.