GB2293568A - Tilting board device for matching with the linear displacement scale of an injection molding machine - Google Patents
Tilting board device for matching with the linear displacement scale of an injection molding machine Download PDFInfo
- Publication number
- GB2293568A GB2293568A GB9419624A GB9419624A GB2293568A GB 2293568 A GB2293568 A GB 2293568A GB 9419624 A GB9419624 A GB 9419624A GB 9419624 A GB9419624 A GB 9419624A GB 2293568 A GB2293568 A GB 2293568A
- Authority
- GB
- United Kingdom
- Prior art keywords
- injection molding
- linear displacement
- tilting board
- displacement scale
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/80—Measuring, controlling or regulating of relative position of mould parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A tilting board (36) fixed to the machine base of an injection molding machine to support the movement of the extension rule (32) of the linear displacement scale (35) of the injection molding machine, including a base frame (37), a supporting rod (38) to support the base frame (37) in place, and an elongated, flat tilting board (36) mounted on the base frame and (37) having a flat, straight top surface disposed in contact with the extension rule (32) of the linear displacement scale (35) for guiding the movement of the linear displacement scale (35) relative to the tilting board (36), the straight top surface of the tilting board (36) defining with the linear displacement scale (35) a contained angle within 0.573x to 16x. <IMAGE>
Description
TILTING BOARD DEVICE FOR MATCHING WITH THE LINEAR
DISPLACEMENT SCALE OF AN INJECTION MOLDING MACHINE
The present invention relates to a tilting board device installable in an injection molding machine to support the movement of an extension rule of a linear displacement scale so that the linear displacement scale measures the displacement of a mold accurately.
In regular injection molding machines, the crank arm is commonly driven by a hydraulic cylinder to hold down the injection molding mold in the closed position. When the injection molding mold is closed, the crank arm must be disposed in the fully extended position so that the designed mold locking force can be applied to the mold by the crank arm accurately. Because injection molding molds are different in thickness. different clamping distances will be achieved when different injection molding molds are installed. Therefore, the procedure to adjust the clamping distance of the installed injection molding mold is important.
If the crank arm is not fully extended out when the mold is closed, it means that the clamping distance is too short. i.e., the mold locking force is excessively high. When an excessive mold locking force is frequently applied to the injection molding mold of an injection molding machine, the mold will wear out quickly. On the contrary, if the mold is not closed tight when the crank arm has been fully extended out, a leakage of molten plastics will occur during the injection molding operation of the machine. Because the clamping distance varies with the thickness of the injection molding mold to be used. it must be adjusted gradually to the accurate value. For this adjustment, a linear displacement scale is needed.
As illustrated in Figures 1 and 2, the linear displacement scale 20 comprises a casing 20a fixed to the machine base, and an extension rule 20b fixed to the crank 2 and moved in and out of the casing 20a. When installed, the longitudinal axis A of the linear displacement scale 20 must be maintained in parallel with the longitudinal axis C of the piston rod B, which reciprocates the crank arm 2. If the axis A and the axis C are not maintained in parallel, the extension rule 20b will be deformed, causing a measuring error. However, it is very difficult to keep the axis A and the axis C in parallel during the installation of the
linear displacement scale 20.
The present invention has been accomplished to provide a tilting board device for supporting the movement of the extension rule of the linear displacement scale of an injection molding machine which eliminates the aforesaid problem.
According to the present invention there is provided a tilting board device for installation in an injection molding machine to match with a linear displacement scale, having a casing and an
extension rule movable in and out of the casing for measurement of the relative position between upper and bottom dies of an injection molding mold during the opening or closing of the mold, comprising a base frame, a supporting rod to support the said base framein place, and an elongated, flat tilting board mounted on the base frame and having a flat, straight top surface disposed in contact with the extension. rule of said linear displacement scale, said straight top surface of said tilting board defining with said linear displacement scale a contained angle within O.573x to 16x.
The present invention will now be described by way of example with reference to the annexed drawings, in which:
Fig. l shows a regular stroke control crank arm installed in an injection molding machine according to the prior art;
Fig. 2 shows a conventional linear displacement scale installed in the stroke control crank arm of Figure 1;
Fig. 3 shows a tilting board device installed in an injection molding machine to match with the linear displacement scaie of the machine according to the present invention;
Fig. 4 is a block diagram of a control circuit for controlling the operation of the injection molding mold according to the present invent ion;
Fig. 5 is an operational flow chart showing the procedure of adjusting the mold locking force according to the present invention;;
Fig. 6 is an operational flow chart showing the procedure of adjusting the clamping of the injection molding mold according to the present invention;
Fig. 7 is an elevational view of the
tilting board device of the present invention;
Fig. 8 shows the tilting board device ol Figure 7 installed;
Fig. 9 shows an alternate form of tilting board device of the present invention;
Fig. 10 shows the tilting board device of Figure 9 installed;
Fig. 11 shows another alternate form of the tilting board device of the present invention: and
Fig. 12 shows the tilting board device of Figure 11 installed.
Referring to the various drawings attached herewith, a detailed description of the structural features of " TILTING BOARD DEVICE FOR
MATCHING WITH THE LINEAR DISPLACEMENT SCALE OF AN
INJECTION MOLDING MACHINE " of the present invention is as follows:
Referring to Figures 3, 7, and 8, the tilting board device 34 in accordance with the present invention is generally comprised of a tilting board 36, a base frame 37, and a supporting rod 38. The tilting board 36 is an elongated flat, narrow board fastened to the base frame 37 at the top by screws 33. The top surface of the tilting board 36 is made straight and flat.
Alternatively, the tilting board 36 may be fastened to the base frame 37 by rivets or by means of a welding process. The base frame 37 is made from a flat board having one end connected to the machine base (or a moving part of the injection molding machine such as the crank arm which moves with the injection molding mold) by screws 0.
The supporting rod 38 has one end connected to the base frame 37 by a screw 71 (or a rivet or by means of a welding process), and an opposite end connected to the same object to which the base frame 37 is connected by screws 70. When installed, the contained angle within the straight top surface of the tilting board 36 and the moving course of the injection molding mold of the injection molding machine is defined within 0.73x to 16x.
Figures 9 and 10 show an alternate form of the tilting board device which comprises a tilting board 36 and a base frame 37 and eliminates the installation of the aforesaid supporting rod 38. The tilting board 36 is fastened to the base frame 37 at the top. The base frame 37 is connected to the machine base (or a moving part of
the injection molding machine such as the crank arm which moves with the injection molding mold) by screws 73 and 74.
Referring to Figures Il and 12. the tilting board 36 and the base board 3, shown in
Figures 9 and 10 may be made in integrity and then fastened to the machine base (or a moving part of the injection molding machine such as the crank arm which moves with the injection molding mold) by screws 3 and 74. A linear displacement scale 3: is provided comprised of a casing 31 and an extension rule 32 moved in and out of the casing 31. The linear displacement scale 35 is mounted on the crank arm 3, defining with the moving course of the injection molding mold a contained angle e (If the tilting board device 34 is connected to the crank arm 3, the linear displacement scale 35 must be fixedly mounted on the machine base) The tip of the extension rule 32 terminates in a pendulum (or magnet) 33 mounted with a roller or rolling steel ball (not shown) disposed in contact with the straight top surface of the tilting board 36.
When the injection molding mold is operated, the roller (rolling steel ball) of the pendulum 33 moves along the straight top surface of the tilting board 36.
Because the linear displacement scale ; is a high precision instrument and the position adjustment of the injection molding mold of a normal injection molding machine is made about 0.Smm per step, the measuring result of the linear displacement scale 35 is accurate and sufficient to satisfy the adjustment precision of the injection molding mold, even if when the moving range of the linear displacement scale 35 is shorter than the actual moving distance of the injection molding mold. according to tests, the precision of the present invention is as high as 0.03 to 0.05mm while the precision requirement of regular injection molding machines is about 0.5mm.
The number of graduations on the linear displacement scale 35 is made subject to the stroke of the opening of the injection molding mold. For example, if the stroke of the opening of the injection molding mold is 400mm and the corresponding extension distance of the linear displacement scale 35 is 100mm, this 100mm is divided into 5000 equal units, and therefore the measured precision is ssOOmm v 1000 = O.lmm. If the extension distance of the linear displacement scale 35 corresponding to the stroke of the opening of the injection molding mold is 120mm, this 120mm is also divided into 4000 equal units, and therefore the measured precision is still ssOOmm v 4000 = O.lmm. Therefore, the measured displacement value and the measured precision have nothing to do with the tilt angle of the tilting board 36.
The extension distance of regular linear displacement scales are commonly designed at 4OOmm and divided into 4000 equal units, therefore each unit of the extension distance is equal to 400mm v 4000 = O.lmm. The extension distance of a linear displacement scale according to the present invention is designed at 100mm and divided into 4000 equal units, therefore each unit is equal to 100mm v 4000 = 0.025mm. One may doubt the superiority in precision of the present invention (one unit = 0.025mm) over the conventional arrangement (one unit = O.lmm).However, because the arrangement of one unit = 0.025mm of the present invention is still within the maximum precision of 0.OOlmm of conventional variable resistor type linear displacement scale, the precision of the present invention fits the precision requirements of regular injection molding machine. Furthermore, because the injection molding mold of an injection molding machine is frequently heated to expand by molten plastics.
excessively high precision requirement causes a waste (normally, the precision of O.ODmm is sufficient). Therefore, the precision of one unit = O.lmm satisfies all requirements.
Referring to Figure 4, the control circuit which controls the operation of the injection molding mold comprises a CP 60, a ROM (read only memory) 61, a RAM (random access memory) 62, a decoder 63, a D/A converter (digital-toanalog converter) 65, a A/D converter (analog-todigital converter) 63, a linear displacement scale 31, and a variable resistor 66 for adjusting the the linear displacement scale 31.
Figure 5 is a operational flow chart showing the procedure of adjusting the mold locking force, referenced by 4. Step 40 is to start the automatic adjustment. After start, it proceeds to step 401 to set the mold locking force, then to step 402 to set the distance of the stroke of opening the mold, and then to step 41 to adjust the crank arm to the set distance, and then to step 4 to move the mold (upper die) forward into position, and then to step 43 to judge if the mold has been closed. If the answer of the judgment is positive, it proceeds to step 431 of increasing the curve distance and then returns to step 41 to adjust the crank arm to the set distance.On the contrary, it the answer of the judgment is negative, it proceeds to step 44 to judge if last mold closing process has been completed. If the result of step 44 is negative, it enters step 441 to reduce the curve distance and then returns to step 41 to adjust the crank arm to the set distance again. If the' result of step 44 is positive, it proceeds to step 45 to resume last curve distance, then to step 46 to adjust the mold forward, and then to step 47 to indicate the completion of the adjustment of mold locking force.
After the procedure of adjusting mold locking force 4, it proceeds to the procedure of adjusting the clamping of the mold :. When started, it enters step S1 to open the mold to the set stroke, then proceeds to step z2 to quickly close the mold (the upper die) to the distance of 100mm from the surface (of the bottom die), then proceeds to step 53 to enter low pressure area 51 by moving the crank arm 3 by the hydraulic cylinder at a low speed, and then proceeds to step 34 to judgment if the surfaces of the upper and bottom dies have been closely attached.If the result of step 54 is positive, it immediately enters step 341 to reduce the the speed of the pressure employed to the low pressure area and then returns to step 51 to open the mold to the set stroke. If the result of step 54 is negative, it immediately enters step 5 to judge if the last procedure has been completed. If the result of step 55 is negative, it immediately enters step 1 to increase the the speed of the pressure employed to the low pressure area, and then returns to step 1 to open the mold to the set stroke. On the contrary, if the result of step 55 is positive, it proceeds to step 56 to resume last the speed of the pressure employed to the low pressure area, then to step 57 to open the mold, and then to step 38 to indicate the completion of the adjustment of the clamping of the mold. This arrangement protects the mold against damage during the opening of the mold.
The aforedescribed control circuit is just for understanding of the operation of the injection molding machine and not within the scope of the present invention.
Claims (4)
1. A tilting board device for installation in an injection molding machine to match with a linear displacement scale, having a casing and an
extension rule movable in and out of the casing for measurement of the relative position between upper and bottom dies of an injection molding mold during the opening or closing of the mold, comprising a base frame, a supporting rod to support the said base frame in place, and an elongated, flat tilting board mounted on the base frame and having a flat, straight top surface disposed in contact with the extension rule of said linear displacement scale, said straight top surface of said tilting board defining with said linear displacement scale a contained angle within 0.5~3.r to 16x.
2. The tilting board device of claim I wherein said base frame and said supporting rod are made in integrity.
3. The tilting board device of claim I wherein said base frame, said supporting rod and said tilting board are made in integrity.
4. A tilting board device substantially as hereinbefore described with reference to and as illustrated in
Figures 3, 7 and 8; or Figures 9 and 10; or Figures 11 and 12 of the accanpanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9419624A GB2293568B (en) | 1994-09-29 | 1994-09-29 | Tilting board device for matching with the linear displacement scale of an injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9419624A GB2293568B (en) | 1994-09-29 | 1994-09-29 | Tilting board device for matching with the linear displacement scale of an injection molding machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9419624D0 GB9419624D0 (en) | 1994-11-16 |
| GB2293568A true GB2293568A (en) | 1996-04-03 |
| GB2293568B GB2293568B (en) | 1998-04-22 |
Family
ID=10762069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9419624A Expired - Fee Related GB2293568B (en) | 1994-09-29 | 1994-09-29 | Tilting board device for matching with the linear displacement scale of an injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2293568B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846654A (en) * | 1986-09-22 | 1989-07-11 | Fanuc Ltd. | Die-touch position detecting apparatus of a motor-operated direct mold clamping mechanism |
| GB2251200A (en) * | 1990-12-29 | 1992-07-01 | Henry Tooze | Monitoring the tie bar extensions of toggle operated injection moulding machines |
| US5238380A (en) * | 1990-09-21 | 1993-08-24 | Eastman Kodak Company | Apparatus for precision volumetric control of a moldable material |
-
1994
- 1994-09-29 GB GB9419624A patent/GB2293568B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846654A (en) * | 1986-09-22 | 1989-07-11 | Fanuc Ltd. | Die-touch position detecting apparatus of a motor-operated direct mold clamping mechanism |
| US5238380A (en) * | 1990-09-21 | 1993-08-24 | Eastman Kodak Company | Apparatus for precision volumetric control of a moldable material |
| GB2251200A (en) * | 1990-12-29 | 1992-07-01 | Henry Tooze | Monitoring the tie bar extensions of toggle operated injection moulding machines |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9419624D0 (en) | 1994-11-16 |
| GB2293568B (en) | 1998-04-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20000929 |